JPH09210576A - Double tube type heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the structure of a double tube type heat exchanger. SOLUTION: In regard to a group G of parallel double tubes which is formed by disposing the double tubes 3 in parallel, header chambers 7a, 7b for a first fluid A in relation to an intertube passage (o) between an inner tube 2 and an outer tube 1 of each double tube 3 are formed between tube plates 4a, 4b for outer tubes which support the end parts of the outer tubes 1 and tube plates 5a, 5b for inner tubes which support the end parts of the inner tubes 2, and header chambers 8a, 8b for a second fluid B in relation to each internal passage (i) of the inner tube 2 of each double tube 3 are formed between the tube plates 5a, 5b for the inner tubes and covers 6a, 6b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention arranges a plurality of double tubes having an inner tube for heat transfer inside an outer tube in parallel, and in each of the double tubes in the double tube parallel group. A first fluid is circulated in an inter-tube flow path between the outer tube and the inner tube, and a second fluid for heat exchange with the first fluid is circulated in an inner flow path of the inner tube, As a result, compared with a so-called shell-and-tube type heat exchanger, the first fluid outside the inner pipe is made to flow to the outer surface of the inner pipe in a highly heat-transferable state to ensure high heat exchange efficiency. The present invention relates to a double pipe heat exchanger.

[0002]

2. Description of the Related Art Conventionally, in a double tube heat exchanger, as a basic structure, two double tubes 3 are arranged in parallel as shown in FIG. 14, and one end side of this double tube parallel group is arranged. , Each of the outer pipes 1 is formed with a pipe connecting portion x as a first fluid inlet / outlet for the inter-pipe flow passage o, and ends of the inner pipes 2 protruding from the closed end of each outer pipe 1. To form a pipe connection portion y as a second fluid inlet / outlet for the internal flow passage i of the inner pipe 2,
On the other hand, on the other end side of the double pipe parallel group, the outer pipes 1 are connected to each other via the crossover pipe 16, and the inner pipes 2 protruding from the closed ends of the outer pipes 1 are crossed via the crossover pipe 15. It has adopted a structure to connect with each other.

In order to secure a large heat transfer area, as a combination of the basic structures, for example, as shown in FIG. 15, three sets L1 to L3 of the basic structure are arranged in parallel to form a first basic structure L1. And the pipe connection part xa for the first fluid outlet in the first basic structure L2.
The pipe connecting portion xb for the fluid inlet is connected, the pipe connecting portion xc for the first fluid outlet in the second basic structure L2, and the pipe for the first fluid inlet in the third basic structure L3. To the header connection Ps for the second fluid distribution, while connecting the conduit connection portion xd to each of the conduit connection portions ya for the second fluid inlet in each of the basic structures L1 to L3. Each of the conduit connection portions yb for the second fluid outlet in each of the basic structures L1 to L3,
The structure is such that it is connected to the header pipe Pe for collecting the second fluid. (See Heat Exchanger Design Handbook, First Edition, Engineering Books Co., Ltd., pp. 666-685,
(See JP-A-54-83162).

[0004]

However, in the above-mentioned conventional structure, a pipe line structure for supplying / discharging the first fluid A to / from a plurality of pipe passages o in the double pipe parallel group, and a double pipe structure. The pipe line structure for supplying and discharging the second fluid B to and from the plurality of internal flow passages o (internal flow passages of the inner pipe 2) in the parallel pipe group becomes complicated, which increases the device cost and increases the device cost. There was a problem of upsizing.

Further, since the structure is complicated as described above, there is a problem that it is difficult to clean, inspect, and repair each of the inter-pipe flow passages o and each of the internal flow passages i.

[0006] Furthermore, the first for the plurality of inter-tube flow paths o
When the fluid A is circulated in parallel or the second fluid B is circulated in parallel to the plurality of internal flow passages i, the first fluid like the second fluid header pipes Ps, Pe in the example of FIG. Each of the conduit connection parts x as the inlet / outlet is connected to the distribution header pipe or the collecting header pipe for the first fluid, and each of the conduit connection parts y as the second fluid inlet / outlet is connected to the second Since the structure is such that it is connected to a distribution header pipe for fluid or a collection header pipe, the pipe resistance in each pipe connection part and the pipe resistance in the distribution header pipe and the collection header pipe affect the flow of multiple pipes. There is also a problem that the distribution of the first fluid A to the passage o and the distribution of the second fluid B to the plurality of internal passages i are likely to be non-uniform, which causes a decrease in heat exchange efficiency.

In view of the above situation, the main object of the present invention is to simplify the structure of the device and, in addition, to distribute the first fluid to a plurality of inter-pipe passages and the second fluid to a plurality of inner passages. The point is to make the distribution even.

Another object of the present invention is to obtain high evaporator performance and condenser performance when used as an evaporator or condenser of a refrigeration circuit.

[0009]

[Means for Solving the Problems]

[Invention of Claim 1] In the invention of Claim 1,
), The first fluid header chamber 7a on one end side and the first fluid header chamber 7a on the other end side.
Either one of the fluid header chamber 7b and the double pipe parallel group G
A plurality of inter-tube passages in the double tube parallel group G, and a header chamber for first fluid distribution (that is, a header chamber on the first fluid supply side) for a plurality of inter-tube passages o in The header chamber for collecting the first fluid with respect to o (that is, the header chamber on the first fluid discharge side).

Further, one of the second fluid header chamber 8a on the one end side and the second fluid header chamber 8b on the other end side is provided with a plurality of internal flow passages i (inner pipes 2 in the double pipe parallel group G). Internal flow path)
To the second fluid distribution header chamber (that is, the header chamber on the second fluid supply side) for the second fluid collection header chamber for the plurality of internal flow paths i in the double pipe parallel group G (That is, the header chamber on the second fluid discharge side).

That is, according to the first aspect of the present invention, between the outer tube tube plates 4a and 4b and the inner tube tube plates 5a and 5b on the one end side and the other end side of the double tube parallel group G, respectively. To form a first fluid header chamber 7a, 7b for a plurality of inter-tube flow paths o, and a second fluid for a plurality of internal flow paths i between the inner tube tube plates 5a, 5b and the lids 6a, 6b. Header room 8,
Since 8b is formed, the above-mentioned conventional structure, that is, the outer pipe 1 is formed with the pipe connection portion x as the first fluid inlet / outlet for the inter-pipe flow passage o, and the end of each inner pipe 2 is formed. A pipe connecting portion y as a second fluid inlet / outlet for the internal flow passage i, and a pipe connecting portion x as a first fluid inlet / outlet for each of the first fluid distribution Compared with a structure in which a header pipe or a collective header pipe is connected, or each of the conduit connection portions y as the second fluid inlet / outlet is connected to a distribution header pipe for the second fluid or a collective header pipe, It can be simplified, which can reduce the device cost and downsize the device.

Further, in addition to the ease of disassembly and assembly due to the simplification of this structure, the internal flow passage i of each inner tube 2 can be exposed to the outside simply by removing the lids 6a and 6b. By simply removing the inner tube tube plates 5a and 5b,
Since each inter-pipe flow path o can be exposed to the outside, cleaning, inspection, and repair of each inter-pipe flow path o and each of the internal flow paths i can be facilitated.

Furthermore, the first fluid header chamber 7 formed between the outer tube tube plates 4a, 4a and the inner tube tube plates 5a, 5b.
a and 7b distribute and collect the first fluid A to the inter-tube flow paths o, and the inner tube tube plates 5a and 5b and the lid 6
Second fluid header chamber 8a, 8b formed between a and 6b
As a result, the second fluid B is distributed and aggregated in each internal flow path i, so that the nonuniformity of the first fluid distribution and the nonuniformity of the second fluid distribution due to the influence of the conduit resistance are avoided, and The distribution of the first fluid A to the inter-flow passages o and the distribution of the second fluid B to each internal flow passage i can be made uniform, and this uniformization ensures a high heat exchange efficiency as compared with the conventional structure. can do.

[Invention of Claim 2] In the invention of Claim 2 (see FIG. 3), there are two parallel parallel pipe groups, namely, a first parallel group G1 and a second parallel group G2. For each of them, a usage pattern similar to that of the invention described in claim 1 is adopted.

That is, for the first parallel group G1, either one of the first fluid header chamber 7a for the first parallel group and the other first fluid header chamber 7b for the first parallel group is provided. One is a header chamber for distributing the first fluid to the plurality of inter-pipe passages o in the first parallel group G1, and the other is the first fluid to the plurality of inter-pipe passages o in the first parallel group G1. The header room for the assembly is used, while the second one on the one end side for the first parallel group is used.
One of the fluid header chamber 8a and the second fluid header chamber 8b on the other end side for the first parallel group is used as a header for distributing the second fluid to the plurality of internal flow paths i in the first parallel group G1. A plurality of internal flow paths i in the first parallel group G1
To the second fluid collection header chamber.

Regarding the second parallel group G2, either the first fluid header chamber 7c for the second parallel group at one end or the first fluid header chamber 7d for the second parallel group at the other end is used. One of the first to the plurality of inter-tube flow paths o in the second parallel group G2
A header chamber for fluid distribution, and the other is used as a header chamber for the first fluid collection for a plurality of inter-tube flow paths o in the second parallel group G2, while one end side for the second parallel group is provided. Second
Either one of the fluid header chamber 8c and the second fluid header chamber 8d on the other end side for the second parallel group is used as a header for distributing the second fluid to the plurality of internal flow paths i in the second parallel group G2. The chamber is used as the chamber, and the other is used as the header chamber for the second fluid collection for the plurality of internal flow paths i in the second parallel group G2.

That is, according to the second aspect of the invention, the outer tube tube plates 4a and 4b and the inner tube tube plate 5a are respectively provided on the one end side and the other end side of the first and second parallel groups G1 and G2. 5
b and the first fluid header chambers 7a and 7b for the plurality of inter-tube passages o in the first parallel group G1, and the first fluid header for the plurality of inter-tube passages o in the second parallel group G2. Chamber 7c, 7
and the second fluid header chambers 8a, 8b for the plurality of internal flow paths i in the first parallel group G1 between the inner tube tube plates 5a, 5b and the lids 6a, 6b. And the second fluid header chambers 8c and 8d for the plurality of internal flow passages i in the second parallel group G2 are formed by partitioning, so that the two heat exchangers are integrated, but are described above. Claim 1
Similar to the described invention, the device structure can be simplified as compared with the conventional structure, and the device cost can be reduced, and
The device can be miniaturized.

By integrating the two heat exchangers, it is possible to effectively achieve the compactness and space saving of the apparatus, as compared with the case where two separate heat exchangers are provided.

Also for cleaning, inspection and repair, the lids 6a and 6b and the tube plate 5 for the inner tube are the same as in the first aspect of the invention.
Simply removing a and 5b, the first and second parallel groups G1,
It is possible to easily perform cleaning, inspection, and repair on each of the inter-pipe flow passages o in G2 and each of the internal flow passages i,
Furthermore, regarding the uniform distribution of the first and second fluids A and B, similarly to the invention described in claim 1, for each of the first and second parallel groups G1 and G2, with respect to each inter-pipe flow path o. The distribution of the first fluid A and the distribution of the second fluid B to each internal flow passage i can be made uniform, and high heat exchange efficiency can be ensured.

[Invention of Claim 3] In the invention of Claim 3 (see FIG. 5), two parallel parallel pipe groups, a first parallel group G1 and a second parallel group G2, are provided. , The first and second fluids A and B are connected in series and used as one heat exchanger.

That is, due to the first fluid header chamber 7m on the other end side for group-to-group crossing, a plurality of tube-to-tube flow paths o in the first parallel group G1 and a plurality of tube-to-tube flow paths in the second parallel group G2. and the second fluid header chamber 8m on the other end side for group-to-group crossing, the plurality of internal flow paths i in the first parallel group G1 and the plurality of internal flow paths i in the second parallel group G2 are connected to each other. The internal flow path i is connected in series.

Then, with respect to the series connection of the first parallel group G1 and the second parallel group G2 at the other end side, at one end side,
A first fluid header chamber 7a on one end side for the first parallel group;
A first parallel group G1 and a second parallel group G2 in which either one of the first fluid header chamber 7b for the parallel group is connected in series.
And a second header group for fluid distribution for the plurality of inter-pipe passages o between the first parallel group G1 and the second parallel group G2 connected in series to the plurality of inter-pipe passages o. A header chamber for collecting one fluid.

Also, one of the second fluid header chamber 8a on the one end side for the first parallel group and the second fluid header chamber 8b on the one end side for the second parallel group is connected in series to form a first parallel. Group G
Second for the plurality of internal flow paths i of the first and second parallel groups G2
The header chamber for fluid distribution is used, and the other is used as the header chamber for collecting the second fluid for the plurality of internal flow paths i of the first parallel group G1 and the second parallel group G2 connected in series.

That is, according to the third aspect of the present invention, the first parallel group is provided between the outer tube tube sheet 4a and the inner tube tube sheet 5a at one end of the first and second parallel group G1 and G2. A first fluid header chamber 7a for a plurality of inter-tube flow paths o in G1,
The first fluid header chamber 7b for the plurality of inter-tube flow paths o in the second parallel group G2 is formed by being partitioned, and the plurality of the first parallel group G1 in the first parallel group G1 is provided between the inner pipe tube sheet 5a and the lid 6a. The second fluid header chamber 8a for the internal flow passage i and the second fluid header chamber 8b for the plurality of internal flow passages i in the second parallel group G2 are formed by partitioning the first and second parallel flow paths. On the other end side of the groups G1 and G2, between the outer tube tube sheet 4b and the inner tube tube sheet 5b, for inter-group passage with respect to the plurality of inter-tube flow paths o in the first and second parallel groups G1 and G2. The first fluid header chamber 7m (in other words, for serial connection) is formed, and the inner pipe tube plate 5b and the lid 6 are formed.
b and the second fluid header chamber 8m for intergroup transfer to the plurality of internal flow paths i in the first and second parallel groups G1 and G2.
Therefore, even though the two heat exchangers are substantially connected in series, the device structure can be simplified as compared with the conventional structure in the same manner as the invention according to claim 1. The device cost can be reduced and the device can be downsized.

Then, the header chamber 7 for group migration on the other end side
Since the structure in which the flow directions of the first fluid A and the second fluid B are reversed at m and 8 m is adopted, compared to the structure in which two heat exchangers are arranged in a line and connected in series, the apparatus is made compact, Space saving can be effectively achieved.

Further, cleaning, inspection and repair, and uniform distribution of the first and second fluids A and B are also claimed.
The same effects as the described invention can be obtained.

[Invention of Claim 4] In the invention of Claim 4 (see FIG. 6), two parallel parallel pipe groups, a first parallel group G1 and a second parallel group G2, are provided. , The first and second fluids A and B are connected in series with each other, and the series connection point for the first fluid path and the series connection point for the second fluid path are connected at one end side in the series connection. It is used as one heat exchanger in a form in which it is distributed to the other side.

That is, due to the first fluid header chamber 7m on the other end side for the intergroup transfer, the plurality of intertube paths o in the first parallel group G1 and the plurality of intertube paths in the second parallel group G2. and the second fluid header chamber 8m on the one end side for group-to-group crossing, the plurality of internal flow passages i in the first parallel group G1 and the second parallel group G2 The plurality of internal flow paths i are communicated in series at one end side.

With respect to the series connection in which the one end side and the other end side are distributed, the first fluid header chamber 7a on the one end side for the first parallel group and the one end for the second parallel group on the one end side. Header for first fluid distribution to a plurality of inter-tube flow paths o of a first parallel group G1 and a second parallel group G2 in which one of the first fluid header chamber 7b on the other side is connected in series at the other end side. The other chamber is used as a chamber, and the other is used as a header chamber for the first fluid collection for the plurality of inter-pipe passages o of the first parallel group G1 and the second parallel group G2 connected in series at the other end side.

On the other end side, one of the second fluid header chamber 8a on the other end side for the first parallel group and the second fluid header chamber 8b on the other end side for the second parallel group is provided. A header chamber for distributing the second fluid to the plurality of internal flow paths i of the first parallel group G1 and the second parallel group G2 connected in series at one end side,
And the other is used as a header chamber for the second fluid collection for the plurality of internal flow paths i of the first parallel group G1 and the second parallel group G2, which are connected in series at one end side.

That is, according to the fourth aspect of the invention, the first parallel group is provided between the outer tube tube sheet 4a and the inner tube tube sheet 5a at one end side of the first and second parallel group G1 and G2. A first fluid header chamber 7a for a plurality of inter-tube flow paths o in G1,
The first fluid header chamber 7b for the plurality of inter-tube flow paths o in the second parallel group G2 is formed by being partitioned, and the first and second parallel groups G1 are provided between the inner pipe tube sheet 5a and the lid 6a. , G2, the second fluid header chamber 8 for intergroup transfer with respect to the plurality of internal flow paths i.
m, and on the other end side of the first and second parallel groups G1 and G2, between the outer tube tube sheet 4b and the inner tube tube sheet 5b, in the first and second parallel group G1 and G2. Forming a first fluid header chamber 7m for inter-group crossing with respect to the plurality of inter-tube flow paths o of the first parallel group G1 between the inner tube tube plate 5b and the lid 6b.
Second fluid header chamber 8a for a plurality of internal flow paths i therein
And the second internal channels i in the second parallel group G2
Since the fluid header chamber 8b is partitioned and formed, the position of the inlet / outlet of the first fluid A and the position of the inlet / outlet of the second fluid B are substantially shifted on the fluid path. Two
Even though two heat exchangers are connected in series for each path of the first and second fluids A and B, the structure of the device is simplified as compared with the conventional structure as in the case of the above-mentioned invention. Therefore, the device cost can be reduced and the device can be downsized.

Since the flow direction of the first fluid A and the second fluid B is inverted in the header chambers 7m and 8m for the intergroup transfer on the other end side and the one end side, the above-mentioned claim 3 is adopted. Similar to the invention, it is possible to effectively achieve the downsizing and space saving of the device, as compared with the case where two heat exchangers are arranged in a line and the same connection configuration is adopted.

Further, cleaning, inspection and repair, and uniform distribution of the first and second fluids A and B are also claimed in claim 1.
The same effects as the described invention can be obtained.

[Invention of Claim 5] In the invention of Claim 5 (see FIG. 7), two parallel parallel pipe groups, a first parallel group G1 and a second parallel group G2, are provided. , The first fluid A path is connected in series, and the second fluid B path is provided with two paths independent of each other.

That is, by the first fluid header chamber 7m on the other end side for group-to-group crossing, a plurality of tube-to-tube flow paths o in the first parallel group G1 and a plurality of tube-to-tube flow paths in the second parallel group G2. and the first fluid header chamber 7a on the one end side for the first parallel group and the second parallel on one end side with respect to the series connection for the inter-pipe flow path o on the other end side. One of the first fluid header chambers 7b on one end side for the group, and the first fluid for the plurality of inter-tube flow paths o of the first parallel group G1 and the second parallel group G2 in which the other end is connected in series. A header chamber for distribution, and the other is used as a header chamber for the first fluid collection for a plurality of inter-pipe passages o of the first parallel group G1 and the second parallel group G2 connected in series on the other end side. .

Regarding the internal flow path i, one of the second fluid header chamber 8a for the first parallel group and the second fluid header chamber 8b for the first parallel group is provided. To
A second fluid distribution header chamber for the plurality of internal flow passages i of the first parallel group G1 and a second fluid collection header chamber for the plurality of internal flow passages i of the first parallel group G1. .

Further, one of the second fluid header chamber 8c for the second parallel group on one end side and the second fluid header chamber 8d for the second parallel group on the other end side is connected to the second parallel group G2. The second fluid distribution header chamber for the plurality of internal flow passages i, and the other header chamber for the second fluid collection for the plurality of internal flow passages i of the second parallel group G2.

That is, according to the fifth aspect of the present invention, the first parallel group is provided between the outer tube tube sheet 4a and the inner tube tube sheet 5a on one end side of the first and second parallel group G1 and G2. A first fluid header chamber 7a for a plurality of inter-tube flow paths o in G1,
The first fluid header chamber 7b for the plurality of inter-tube flow paths o in the second parallel group G2 is formed by being partitioned, and the plurality of the first parallel group G1 between the inner tube tube sheet 5a and the lid 6a are formed. A second fluid header chamber 8a for the internal flow passage i and a second fluid header chamber 8c for the plurality of internal flow passages i in the second parallel group G2 are partitioned and formed, and the first and second parallel On the other end side of the groups G1 and G2, between the outer tube tube sheet 4b and the inner tube tube sheet 5b, for inter-group passage with respect to the plurality of inter-tube flow paths o in the first and second parallel groups G1 and G2. The first fluid header chamber 7m is formed, and the first parallel group G1 is formed between the inner tube tube plate 5b and the lid 6b.
Second fluid header chamber 8b for a plurality of internal flow paths i therein
And the second internal channels i in the second parallel group G2
Since the fluid header chamber 8d is partitioned and formed, two heat exchangers are substantially connected in series for the path of the first fluid A and independent of each other for the path of the second fluid B. Even though the device is connected so as to provide a path, the device structure can be simplified as compared with the conventional structure, the device cost can be reduced, and the device can be downsized as in the case of the above-described invention. Can be transformed.

The header chamber 7 for group migration on the other end side
The flow direction of the first fluid A is reversed by m, and the second fluid B is arranged in parallel with the first and second parallel groups G1,
Since the structure in which two independent paths are formed by G2 is adopted, the size of the device can be made smaller than that in the case where two heat exchangers are arranged in a line and only the first fluid path is connected in series.
Space saving can be effectively achieved.

In addition, cleaning, inspection and repair, and uniform distribution of the first and second fluids A and B are also claimed.
The same effects as the described invention can be obtained.

[Invention of Claim 6] In the invention of Claim 6 (see FIG. 9), like the invention of Claim 3 described above, the first group of two double-pipe parallel groups arranged in parallel. The parallel group G1 and the second parallel group G2 are connected to the first and second fluids A and B.
These are used as one heat exchanger in a form in which each path is connected in series.

That is, by the first fluid header chamber 7m on the other end side for crossing between groups, a plurality of pipe flow paths o in the first parallel group G1 and a plurality of pipe flow paths in the second parallel group G2. a plurality of insides of the first parallel group G1 by connecting in series with o and by individual connection by the inner pipe connecting pipe 15 inside the first fluid header chamber 7m on the other end side for this intergroup transfer. The flow passage i and the plurality of internal flow passages i in the second parallel group G2 are connected in series.

With respect to the series connection of the first parallel group G1 and the second parallel group G2 on the other end side,
A first fluid header chamber 7a on one end side for the first parallel group;
A first parallel group G1 and a second parallel group G2 in which either one of the first fluid header chamber 7b for the parallel group is connected in series.
And a second header group for fluid distribution for the plurality of inter-pipe passages o between the first parallel group G1 and the second parallel group G2 connected in series to the plurality of inter-pipe passages o. A header chamber for collecting one fluid.

Also, one of the second fluid header chamber 8a for the first parallel group and the second fluid header chamber 8b for the second parallel group is connected in series to form a first parallel. Group G
Second for the plurality of internal flow paths i of the first and second parallel groups G2
The header chamber for fluid distribution is used, and the other is used as the header chamber for collecting the second fluid for the plurality of internal flow paths i of the first parallel group G1 and the second parallel group G2 connected in series.

That is, according to the invention of claim 6, the inner pipe 2 in the first parallel group G1 and the inner pipe 2 in the second parallel group G2 are the same as those in the first and second parallel groups G1 and G2. At the other end, a structure is used in which the inner pipe crossover pipe 15 is used for individual connection.
Also, on one end side of the second parallel group G1, G2, between the outer tube tube sheet 4a and the inner tube tube sheet 5a, the first fluid header chamber 7a for the plurality of inter-tube flow paths o in the first parallel group G1. And the first fluid header chamber 7b for the plurality of inter-tube flow paths o in the second parallel group G2 are defined and formed, and the inner tube tube sheet 5a and the lid 6 are formed.
A second fluid header chamber 8a for a plurality of internal flow passages i in the first parallel group G1 and a second fluid header chamber 8b for a plurality of internal flow passages i in the second parallel group G2 are provided between a and a. In terms of dividing and forming, the first and second parallel groups G
On the other end side of 1 and G2, between the outer tube tube plate 4b and the lid 6b, for inter-group crossing with respect to the plurality of inter-tube flow paths o in the first and second parallel groups G1 and G2 (that is, in series). Similar to the invention according to claim 1, in forming the first fluid header chamber 7m (for connection), the device structure can be simplified as compared with the conventional structure, thereby reducing the device cost. In addition, the device can be downsized.

Since the first fluid header chamber 7m for inter-group crossover on the other end side and the inner pipe crossover pipe 15 have a structure in which the flow directions of the first fluid A and the second fluid B are reversed, Similar to the third aspect of the present invention, as compared with the structure in which two heat exchangers are arranged in a row and connected in series, the apparatus can be made more compact and the space can be effectively saved.

In addition, cleaning, inspection and repair, and uniform distribution of the first and second fluids A and B are also claimed.
The same effects as the described invention can be obtained.

[Invention of Claim 7] In the invention of Claim 7 (see FIG. 10), like the inventions of Claims 3 and 6, there are two parallel groups of double tubes arranged in parallel. The first parallel group G1 and the second parallel group G2 are connected in series for each path of the first and second fluids A and B, and are used as one heat exchanger.

That is, the first and second parallel groups G1 and G2
On the other end side, the plurality of inter-tube passages o in the first parallel group G1 and the plurality of inter-tube passages o in the second parallel group G2 are connected in series by individual connection by the outer pipe crossover pipe 16. Further, the plurality of internal flow passages i in the first parallel group G1 and the plurality of internal flow passages i in the second parallel group G2 are connected in series by the individual connection by the inner pipe crossover pipe 15.

Then, with respect to the series connection of the first parallel group G1 and the second parallel group G2 at the other end side, at one end side,
A first fluid header chamber 7a on one end side for the first parallel group;
A first parallel group G1 and a second parallel group G2 in which either one of the first fluid header chamber 7b for the parallel group is connected in series.
And a second header group for fluid distribution for the plurality of inter-pipe passages o between the first parallel group G1 and the second parallel group G2 connected in series to the plurality of inter-pipe passages o. A header chamber for collecting one fluid.

Also, one of the second fluid header chamber 8a on the one end side for the first parallel group and the second fluid header chamber 8b on the one end side for the second parallel group is connected in series as a first parallel. Group G
Second for the plurality of internal flow paths i of the first and second parallel groups G2
The header chamber for fluid distribution is used, and the other is used as the header chamber for collecting the second fluid for the plurality of internal flow paths i of the first parallel group G1 and the second parallel group G2 connected in series.

That is, according to the invention of claim 7, the outer tube 1 in the first parallel group G1 and the outer tube 1 in the second parallel group G2 are the same as those of the first and second parallel groups G1 and G2. The other end is connected individually by the outer pipe crossover pipe 16, and the first parallel group G
The inner pipe 2 in 1 and the inner pipe 2 in the second parallel group G2 are individually connected by the inner pipe connecting pipe 15 on the other end side of the first and second parallel groups G1 and G2. The first fluid header chamber for the plurality of inter-tube flow paths o in the first parallel group G1 between the outer tube tube sheet 4a and the inner tube tube sheet 5a on one end side of the first and second parallel groups G1 and G2. 7a and the second parallel group G
The first fluid header chamber 7b for the plurality of inter-tube flow paths o in FIG.
And the second fluid header chamber 8a for the plurality of internal flow passages i in the first parallel group G1 and the second parallel group G2 between the inner tube tube plate 5a and the lid 6a. Like the invention according to claim 1 described above, the device structure can be simplified as compared with the conventional structure in that the second fluid header chamber 8b for the plurality of internal flow passages i is partitioned and formed. ,
Thereby, the device cost can be reduced and the device can be downsized.

The outer pipe connecting pipe 16 and the inner pipe connecting pipe 15 on the other end side have a structure in which the flow directions of the first fluid A and the second fluid B are reversed, so that the above-mentioned claim 3 is adopted.
Similar to the inventions described in (4) and (6), it is possible to effectively achieve the downsizing and space saving of the device, as compared with the structure in which two heat exchangers are arranged in a line and connected in series.

Further, cleaning, inspection and repair, and uniform distribution of the first and second fluids A and B are also claimed in claim 1.
The same effects as the described invention can be obtained.

[Invention of claim 8] In the invention of claim 8, in a device posture in which the pipe direction is horizontal, the refrigerant to be evaporated in the refrigeration circuit is circulated in each inter-tube flow path o,
In addition, by allowing the heat absorption target fluid to flow through each internal flow path i, the evaporation target refrigerant is gradually evaporated by the heat absorption from the heat absorption target fluid in the distribution process in the inter-pipe flow path o.

When the double tube heat exchanger is used as an evaporator of the refrigeration circuit in this way, the inner tube 2 is placed below the center of the outer tube 1 on the downstream side of the inter-tube flow path o. By adopting the eccentric structure (see (a) of FIG. 12), the evaporation target refrigerant A that has not evaporated yet is provided on the upstream side of the inter-pipe flow path o.
In contrast to this, the large gap between the inner pipe 2 and the outer pipe 1 on the lower side of the inner pipe 2 is ensured, and the unvaporized refrigerant A to be evaporated is sufficiently circulated on the lower side of the inner pipe 2. However, while the amount of the non-evaporated refrigerant A to be evaporated is small on the downstream side of the inter-tube flow path o, the unevaporated refrigerant A to be evaporated and the inner tube 2 have a lower eccentric arrangement of the inner tube 2. By ensuring a large contact area with the evaporation target refrigerant A which has not evaporated and the heat absorption target fluid B flowing inside the inner tube 2, the efficiency of heat exchange between the inter-tube flow path o downstream side is improved. Secure high.

Therefore, according to the invention described in claim 8, high evaporator performance can be obtained in use as an evaporator in a refrigeration circuit.

[Invention of Claim 9] In the invention of Claim 9, in carrying out the invention of Claim 8 described above, the inner pipe 2 is connected to the outer pipe 1 on the downstream side of the inter-pipe flow path o. By adopting the structure of contacting with the bottom of the inner peripheral surface (see (b) of FIG. 12), on the downstream side of the inter-tube flow path o in which the amount of the non-evaporated refrigerant A to be evaporated is small, the inside of Due to the heat conduction between the pipe 2 and the outer pipe 1, the non-evaporated refrigerant A to be evaporated is made to absorb heat from the inner pipe 2 as well as from the outer pipe 1, thereby ensuring a large heat transfer area.

Therefore, according to the ninth aspect of the present invention, when used as an evaporator in a refrigeration circuit, higher evaporator performance can be obtained.

[Invention of Claim 10] In the invention of Claim 10, in the apparatus posture in which the pipe direction is horizontal,
The refrigerant to be condensed in the refrigeration circuit is circulated in each inter-tube flow path o, and the fluid to be radiated is circulated in each internal flow path i. It is gradually condensed in the distribution process in the path o.

In using the double-tube heat exchanger as a condenser of the refrigeration circuit in this way, the inner tube 2 is biased upward with respect to the center of the outer tube 1 on the downstream side of the inter-tube flow path o. By adopting the centering structure (see (a) of FIG. 13), the uncondensed condensation target refrigerant A is provided on the upstream side of the inter-pipe flow path o.
In contrast to the above, the large gap between the inner pipe 2 and the outer pipe 1 on the upper side of the inner pipe 2 is ensured so that the uncondensed refrigerant A to be condensed can sufficiently flow also on the upper side of the inner pipe 2. However, on the downstream side of the inter-pipe flow path o, the uncondensed condensation target refrigerant A is small, whereas the uncondensed condensation target refrigerant A and the inner tube 2 have the upper eccentric arrangement of the inner tube 2. A large contact area is ensured, whereby the efficiency of heat exchange between the uncondensed refrigerant A to be condensed and the fluid B to be radiated which circulates inside the inner tube 2 is increased even on the downstream side of the inter-tube flow path o. Secure.

Therefore, according to the tenth aspect of the present invention, when used as a condenser in a refrigeration circuit, high condenser performance can be obtained.

[Invention of Claim 11] In the invention of Claim 11, in carrying out the invention of Claim 10 described above, the inner pipe 2 is connected to the outer pipe 1 on the downstream side of the inter-pipe flow path o. By adopting the structure of contacting the upper part of the inner peripheral surface (see (b) of FIG. 13), the inside of the inter-tube flow path o where the uncondensed refrigerant A to be condensed is small, Due to the heat conduction between the pipe 2 and the outer pipe 1, the uncondensed refrigerant A to be condensed is radiated to the inner pipe 2 as well as to the outer pipe 1 to secure a large heat transfer area.

Therefore, according to the eleventh aspect of the present invention, even higher condenser performance can be obtained when used as a condenser in a refrigeration circuit.

[0065]

BEST MODE FOR CARRYING OUT THE INVENTION

[First Embodiment] FIGS. 1 and 2 show a double-tube heat exchanger of a first embodiment, in which a plurality of double tubes 3 in which an inner tube 2 for heat transfer is arranged inside an outer tube 1 are provided. The outer pipe 1 and the inner pipe 2 are arranged in parallel with each other in each of the double pipes 3 in the double pipe parallel group G.
The first fluid A is circulated in the inter-pipe flow path o between the inner pipe 2 and the inner flow passage i of the inner pipe 2, and the second fluid B is exchanged with the first fluid A for heat exchange.

On one end side of the double tube parallel group G, an outer tube tube plate 4a for supporting one end of each outer tube 1 and
Inner pipe tube plate 5a on one end side that supports one end portion of each of the inner pipes 2 protruding from one end of the outer pipe 1, and one end side that is arranged on the outer side in the pipe direction with respect to this inner pipe tube plate 5a on one end side Lid 6a
Are provided.

By connecting the outer tube tube plate 4a on one end side and the inner tube tube plate 5a on one end side, between the outer tube tube plate 4a and the inner tube tube plate 5a on one end side,
Forming a first fluid header chamber 7a on one end side for each of the inter-tube flow paths o in the double pipe parallel group G, and connecting the inner pipe tube sheet 5a on one end side and the lid 6a on one end side. Thus, between the inner tube tube plate 5a and the lid 6a on the one end side,
The second fluid header chamber 8a is formed on one end side with respect to each of the internal flow passages i (internal flow passages of the inner pipe 2) in the double pipe parallel group G.

Reference numeral 9a denotes a pipe connecting portion as a first fluid inlet / outlet for the first fluid header chamber 7a on one end side, and 10a.
Is a conduit connection portion as a second fluid inlet / outlet for the second fluid header chamber 8a on one end side.

On the other hand, on the other end side of the double pipe parallel group G, the outer pipe tube plate 4b on the other end side for supporting the other end portion of each outer pipe 1 and the other end of the outer pipe 1 are projected. The inner pipe tube plate 5b on the other end side that supports the other end portions of the inner pipes 2 and the lid 6b on the other end side that is arranged outside the inner pipe tube plate 5b on the other end side in the pipe direction. It is provided.

By connecting the outer tube tube plate 4b on the other end side to the inner tube tube plate 5b on the other end side, the outer tube tube plate 4b and the inner tube tube plate 5b on the other end side are connected to each other. To
A first fluid header chamber 7b on the other end side for each of the inter-tube flow paths o in the double tube parallel group G is formed, and an inner tube tube plate 5b on the other end side and a lid 6b on the other end side are formed. By connecting, between the inner tube tube plate 5b and the lid 6b on the other end side,
The second fluid header chamber 8b is formed on the other end side with respect to each of the internal flow paths i in the double pipe parallel group G.

Reference numeral 9b denotes a conduit connection portion as a first fluid inlet / outlet for the first fluid header chamber 7b on the other end side, 10b.
Is a conduit connection portion as a second fluid inlet / outlet for the second fluid header chamber 8b on the other end side.

Reference numeral 11 denotes a cylindrical body surrounding the double tube parallel group G,
At one end of the barrel 11, the outer tube tube plate 4a on the one end side is provided.
And the outer tube tube plate 4b on the other end side is connected to the other end. Although not shown, a heat insulating material is provided on the inner peripheral surface portion of the barrel 11 (in some cases, the entire inside of the barrel 11 including the space between the double tubes 3) to prevent heat loss.

In this double-tube heat exchanger, as a usage pattern, one of the first fluid header chamber 7a on one end side and the first fluid header chamber 7b on the other end side is connected to the double-pipe parallel group G. A header chamber for distributing the first fluid (that is, a header chamber on the side of the first fluid supply) to a plurality of inter-pipe flow paths o therein, and
The other is the header chamber for the first fluid collection (that is, the header chamber on the first fluid discharge side) for the plurality of inter-tube passages o in the double tube parallel group G.

Further, one of the second fluid header chamber 8a on the one end side and the second fluid header chamber 8b on the other end side is provided with the second fluid for the plurality of internal flow passages i in the double pipe parallel group G. Header chamber for distribution (that is, header chamber on second fluid supply side)
And, on the other hand, the header chamber for the second fluid assembly (that is, the second
The header chamber on the fluid discharge side).

That is, an example of use in which the first fluid header chamber 7a on the one end side is the header chamber for the first fluid distribution, and the second fluid header chamber 8b on the other end side is the header chamber for the second fluid distribution. In this case, the first fluid A is supplied from the pipe line connection portion 9a on one end side to the first fluid header chamber 7a on one end side as indicated by a solid arrow in the figure, and the first fluid header on this one end side is supplied. Room 7
Distribute from a to each inter-tube flow path o. Then, the inter-pipe flow path o
The heat-exchanged first fluid A that has passed through is collected in the first fluid header chamber 7b on the other end side, and the collected heat-exchanged first fluid A is collected.
The fluid A is sent out of the device from the conduit connection portion 9b on the other end side.

On the other hand, the second fluid B is supplied from the conduit connecting portion 10b on the other end side to the second fluid header chamber 8b on the other end side, as indicated by the broken line arrow in the figure, and the others. The second end
It distributes from the fluid header chamber 8b to each internal flow path i. Then, the heat-exchanged second fluid B that has passed through each internal flow path i is collected in the second fluid header chamber 8a on one end side, and the collected heat-exchanged second fluid B is connected to the one end side pipe line. It is sent out from the connecting portion 10a.

For cleaning, inspection and repair of each inter-pipe flow passage o and each internal flow passage i, the lids 6a and 6b on one end side and the other end side are removed, and the inner flow passage i of each inner pipe 2 is exposed to the outside. This is carried out in a state of facing each other, or by removing the inner tube tube plates 5a and 5b on the one end side and the other end side and facing each inter-tube flow path o to the outside.

In the state where the double pipe heat exchanger is arranged in a posture in which the pipe direction is horizontal, the refrigerant to be evaporated in the refrigeration circuit as the first fluid A is circulated through the inter-pipe passages o, and In the case where the second fluid B is used as an evaporator that circulates the heat-absorption target fluid through each internal flow passage i, the evaporation target refrigerant A that has not been evaporated further downstream of the inter-pipe flow path o Corresponding to the decrease in the refrigerant A, the inner pipe 2 is located at the center of the outer pipe 1 on the upstream side of each inter-pipe flow path o, while the inter-pipe flow path is positioned as shown in FIG. As shown in FIG. 12 (a), the eccentric double pipe structure of the inner pipe inclined arrangement in which the inner pipe 2 is eccentric downward with respect to the center of the outer pipe 1 is adopted toward the downstream side of o, Thereby, the performance of the evaporator may be improved.

Further, with the double pipe heat exchanger arranged in a posture in which the pipe direction is horizontal, the refrigerant to be condensed in the refrigeration circuit as the first fluid A is circulated through the inter-pipe passages o, and In the case where the second fluid B is used as a condenser for circulating the fluid to be radiated to each internal flow passage i, the double pipe heat exchanger adopting the eccentric double pipe structure with the inner pipe inclined arrangement is used. In the form of upside-down use, that is, in correspondence with the gradual condensation of the condensation object refrigerant A, the uncondensed condensation object refrigerant A decreases toward the downstream side of the inter-tube flow path o. On the upstream side of o, as shown in FIG. 11, the inner pipe 2 is located at the center of the outer pipe 1, while as it goes to the downstream side of each inter-pipe flow path o, it is shown in (a) of FIG. As described above, the inner tube 2 is eccentric to the center of the outer tube 1 so that the condenser performance is improved. It may be improving.

Further, in adopting the eccentric double pipe structure with the inner pipe inclined arrangement as described above, when it is used as an evaporator, it is shown in FIG. As shown, the inner tube 2 is finally brought into contact with the bottom portion of the inner peripheral surface of the outer tube 1, and in the case of use as a condenser, the inter-tube flow paths o
13B, the inner pipe 2 is finally brought into contact with the upper portion of the inner peripheral surface of the outer pipe 1 on the downstream side of FIG. On the downstream side of each inter-tube flow path o in which the target refrigerant is reduced, heat transfer between the inner tube 2 and the outer tube 1 via the above-mentioned contact portion causes the heat transfer surface of the outer tube 1 in addition to the inner tube 2. It may be made to function as a constituent material.

[Second Embodiment] FIGS. 3 and 4 show a double-tube heat exchanger according to a second embodiment of the present invention. As a double-tube parallel group in which a plurality of double tubes 3 are arranged in parallel, Parallel group G1 and second
The parallel group G2 is arranged in parallel, and in this arrangement,
The two double tube heat exchangers are integrated.

Specifically, the first and second parallel groups G1 and G
On one end side of the outer tube 1, the outer tube tube plate 4a supporting one end of each outer tube 1 and one end side supporting each one end of the inner tube 2 protruding from one end of the outer tube 1 Tube plate 5 for tubes
a and a lid 6a on the one end side which is arranged outside the tube plate 5a for the inner pipe on the one end side in the tube direction.

Then, by connecting the outer tube tube plate 4a on one end side and the inner tube tube sheet 5a on one end side, the inner wall portion 12a formed on the tube plates 4a to 5a serves as a partition, and the outer tube part on the one end side is formed. Between the tube plate 4a and the tube plate 5a for the inner tube, the first for each of the inter-tube flow paths o in the first parallel group G1.
The first fluid header chamber 7a on one end side for the parallel group and the first fluid header chamber 7c on one end side for the second parallel group for each of the inter-tube flow paths o in the second parallel group G2 are defined and formed. The inner wall portion 13a formed on the tube sheet 5a or the lid 6a by connecting the tube sheet 5a for the inner tube on the one end side and the lid 6a on the one end side.
As a partition, and the inner tube tube plate 5a on one end side thereof
And the lid 6a, the second fluid header chamber 8 on one end side for the first parallel group for each of the internal flow paths i in the first parallel group G1.
a and a second fluid header chamber 8c on one end side for the second parallel group with respect to each of the internal flow paths i in the second parallel group G2.

Reference numeral 9a denotes a conduit connection portion as a first fluid inlet / outlet for the first fluid header chamber 7a at one end side for the first parallel group, and 9c denotes a first fluid at one end side for the second parallel group. The conduit connection portion 10a as the first fluid inlet / outlet for the header chamber 7c is a conduit connection portion 10c as the second fluid inlet / outlet for the second fluid header chamber 8a on the one end side for the first parallel group. Is a conduit connection portion as a second fluid inlet / outlet for the second fluid header chamber 8c on the one end side for the second parallel group.

On the other hand, on the other end side of the first and second parallel groups G1 and G2, the outer tube plate 4b for supporting the other end of each outer tube 1 and the other end of the outer tube 1 are provided. Tube plate 5b for the inner pipe on the other end side that supports the other end of each of the inner pipes 2 that protrudes beyond
And a lid 6b on the other end side, which is arranged outside the tube plate 5b for the inner pipe on the other end side in the tube direction.

Then, by connecting the outer tube tube plate 4b on the other end side and the inner tube tube plate 5b on the other end side, the inner wall portion 12b formed on the tube plates 4b to 5b serves as a partition, and the other end side is formed. Between the outer tube tube plate 4b and the inner tube tube plate 5b in the first parallel group G1.
A first fluid header chamber 7b on the other end side for the parallel group and a first fluid header chamber 7d on the other end side for the second parallel group for each of the inter-tube flow paths o in the second parallel group G2 are defined. The inner wall portion 13b formed on the tube plate 5b or the lid 6b is formed by connecting the tube plate 5b for the inner pipe on the other end side and the lid 6b on the other end side.
As a partition, and the inner tube tube plate 5b on the other end side
And the lid 6b, the second fluid header chamber 8 on the other end side for the first parallel group for each of the internal flow paths i in the first parallel group G1.
b and the second fluid header chamber 8d on the other end side for the second parallel group with respect to each of the internal flow paths i in the second parallel group G2 are defined and formed.

Reference numeral 9b denotes a conduit connection portion as a first fluid inlet / outlet for the first fluid header chamber 7b on the other end side for the first parallel group, and 9d denotes a second fluid connection on the other end side for the second parallel group. A conduit connection portion 10b as a first fluid inlet / outlet for the first fluid header chamber 7d is a conduit connection as a second fluid inlet / outlet for the second fluid header chamber 8b on the other end side for the first parallel group. The portions 10d are conduit connection portions as second fluid inlets / outlets for the second fluid header chamber 8d on the other end side for the second parallel group.

Reference numeral 11 denotes a cylindrical body that surrounds the first and second parallel groups G1 and G2. As in the case of the first embodiment described above, one end of the cylindrical body 11 has an outer tube tube plate on the one end side. 4a
The outer tube tube plate 4b on the other end side is connected to the other end. In addition, the inside of the barrel 11 is defined by the inner wall portion 14.
It divides into the part which installs the 1st parallel group G1 and the part which installs the 2nd parallel group G2, and in each of these partition parts,
A heat insulating material (not shown) is provided on the inner peripheral surface portion of the barrel 11 and the wall surface portion of the inner wall portion 14 (in some cases, the entire interior of each partition portion including the space between the double tubes 3), and thereby, The first parallel group G1 and the second parallel group G together with the heat radiation loss to the outside of the unit
Prevents heat loss due to heat transfer between the two.

In this double-tube heat exchanger, as a usage pattern, for the first parallel group G1, the first fluid header chamber 7a on one end side for the first parallel group and the other end for the first parallel group are provided. One of the first fluid header chamber 7b on the side of the first parallel group G
1 is used as a header chamber for the first fluid distribution for the plurality of inter-tube passages o in 1 and the other is used as the header chamber for the first fluid collection for the plurality of inter-tube passages o in the first parallel group G1; On the other hand, the second fluid header chamber 8a on the one end side for the first parallel group
And the second fluid header chamber 8b on the other end side for the first parallel group are connected to the plurality of internal flow paths i in the first parallel group G1.
To the second fluid distribution header chamber and the other to the second fluid collecting header chamber for the plurality of internal flow paths i in the first parallel group G1.

Similarly, for the second parallel group G2, the first fluid header chamber 7c on the one end side for the second parallel group is provided.
And one of the first fluid header chambers 7d on the other end side for the second parallel group are connected to the plurality of inter-tube flow paths o in the second parallel group G2.
To the first fluid distribution header chamber for the first fluid collection, and the other to the first fluid collection header chamber for the plurality of inter-tube flow paths o in the second parallel group G2. One of the second fluid header chamber 8c on the one end side and the second fluid header chamber 8d on the other end side for the second parallel group is connected to the plurality of internal flow paths i in the second parallel group G2 by the second The header chamber for fluid distribution is used, and the other is used as the header chamber for the second fluid collection for the plurality of internal flow paths i in the second parallel group G2.

That is, in the heat exchanger on the first parallel group G1 side, the first fluid header chamber 7a on one end side serves as a header chamber for distributing the first fluid, and the second fluid header chamber 8 on the other end side.
In the case of the use example in which b is the header chamber for distributing the second fluid, the first fluid A (A1) is supplied from the conduit connecting portion 9a on the one end side to the first fluid A (A1) on the one end side as shown by the solid line arrow in the figure. Fluid header chamber 7
It is supplied to a and is distributed from the first fluid header chamber 7a on the one end side to the inter-tube flow paths o of the first parallel group G1. Then, the first heat-exchanged first parts that have passed through the inter-tube flow paths o of the first parallel group G1.
The fluid A (A1) is collected in the first fluid header chamber 7b on the other end side, and the collected heat-exchanged first fluid A (A1) is collected.
Is sent to the outside of the device from the conduit connecting portion 9b on the other end side.

On the other hand, the second fluid B (B1) is supplied from the conduit connecting portion 10b on the other end side to the second fluid header chamber 8b on the other end side, as indicated by the broken line arrow in the figure. , From the second fluid header chamber 8b on the other end side to each internal flow passage i of the first parallel group G1. Then, the heat-exchanged second fluid B (B1) that has passed through each internal flow path i of the first parallel group G1 is collected in the second fluid header chamber 8a on the one end side, and the collected heat-exchanged fluid B (B1) is collected. The second fluid B (B1) is connected to the conduit connection portion 1 on one end side.
It is sent out from 0a.

On the other hand, in the heat exchanger on the side of the second parallel group G2, the first fluid header chamber 7d on the other end side is used as the header chamber for distributing the first fluid, and the second fluid header chamber 8c on the one end side is formed.
In the case of the use example in which is the header chamber for the second fluid distribution,
The fluid A (A2) is, as shown by the solid line arrow in the figure, from the conduit connection portion 9d on the other end side to the first fluid header chamber 7d on the other end side.
To the inter-tube flow paths o of the second parallel group G2 from the first fluid header chamber 7d on the other end side. And the second
The heat-exchanged first fluid A (A2) that has passed through the inter-tube flow paths o of the parallel group G2 is collected in the first fluid header chamber 7c on the one end side, and the collected heat-exchanged first fluid A (A2) is collected. A (A2) is sent to the outside of the vessel from the conduit connecting portion 9c on the other end side.

On the other hand, the second fluid B (B2) is supplied to the second fluid header chamber 8c on the one end side from the conduit connecting portion 10c on the one end side, as indicated by the broken line arrow in the figure. The fluid is distributed from the second fluid header chamber 8c on the one end side to each internal flow passage i of the second parallel group G2. Then, the heat-exchanged second fluid B (B2) that has passed through each of the internal flow paths i of the second parallel group G2 is collected in the second fluid header chamber 8d on the other end side, and the collected heat-exchanged is completed. The second fluid B (B2) of
Send out from 0d.

The first fluid A1 flowing in the inter-tube flow path o of the first parallel group G1 and the first fluid A2 circulating in the inter-tube flow path o of the second parallel group G2 are different from each other. Alternatively, the same kind may be used. Also, the first
A second fluid B1 which is circulated in the internal flow path i of the parallel group G1,
The second fluid B2 to be circulated in the internal flow path i of the second parallel group G2
May be different from each other or may be the same.

Cleaning and inspection / repair of the inter-pipe flow passages o and the internal flow passages i of the first and second parallel groups G1 and G2 are performed on one end side and the other end, as in the first embodiment. Side lid 6
a and 6b are removed to remove the first and second parallel groups G1 and G2.
In the state in which the internal flow path i of each inner pipe 2 is exposed to the outside and the inner pipe tube plates 5a and 5b on the one end side and the other end side are removed, the first and second parallel groups G1 and G2 It is carried out in a state where each inter-pipe flow path o is exposed to the outside.

The heat exchanger on the side of the first parallel group G1 and the second
With respect to each of the heat exchangers on the side of the parallel group G2, the evaporation target refrigerant in the refrigeration circuit as the first fluid A is circulated through the inter-tube flow paths o in a device posture in which the tube direction is horizontal, and
When used as an evaporator for circulating the fluid to be endothermic as the fluid B in each internal flow passage i, as in the case of the above-described first embodiment, on the upstream side of each inter-pipe flow passage o, as shown in FIG. While the inner pipe 2 is located at the center of the outer pipe 1, the inner pipe 2 is located at the center of the outer pipe 1 as shown in FIG. On the other hand, an eccentric double pipe structure with an inclined inner pipe that is eccentric to the lower side may be adopted. Further, in adopting this eccentric double pipe structure with the inclined inner pipe, On the downstream side of o, (b) in FIG.
As shown in, a structure may be adopted in which the inner tube 2 is finally brought into contact with the bottom portion of the inner peripheral surface of the outer tube 1.

Further, for each of the heat exchangers on the side of the first parallel group G1 and the heat exchanger on the side of the second parallel group G2, in the refrigerating circuit as the first fluid A in a device orientation in which the pipe direction is horizontal. In the case of use as a condenser in which the refrigerant to be condensed is circulated in each pipe flow path o and the heat dissipation target fluid is circulated in each internal flow path i as the second fluid B, this is also the above-mentioned first
As in the case of the embodiment, on the upstream side of each inter-pipe flow path o, as shown in FIG. 11, the inner pipe 2 is located at the center of the outer pipe 1, while on the downstream side of each inter-pipe flow path o. 13
As shown in (a) of (1), an eccentric double pipe structure of an inner pipe inclined arrangement in which the inner pipe 2 is eccentric to the center of the outer pipe 1 may be adopted. In adopting the eccentric double pipe structure, the inner pipe 2 is finally brought into contact with the upper part of the inner peripheral surface of the outer pipe 1 on the downstream side of each inter-pipe flow path o, as shown in FIG. A structure may be adopted.

[Third Embodiment] FIG. 5 shows a double-tube heat exchanger according to a third embodiment. As a double-tube parallel group in which a plurality of double tubes 3 are arranged in parallel, a first parallel group G1 is provided. And the second parallel group G
2 and 2 are arranged in parallel, and in this arrangement, substantially two double-tube heat exchangers are connected in series.

Specifically, the first and second parallel groups G1 and G
On one end side of the outer tube 1, the outer tube tube plate 4a supporting one end of each outer tube 1 and one end side supporting each one end of the inner tube 2 protruding from one end of the outer tube 1 Tube plate 5 for tubes
a and a lid 6a on the one end side which is arranged outside the tube plate 5a for the inner pipe on the one end side in the tube direction.

Then, by connecting the outer tube tube plate 4a on one end side and the inner tube tube sheet 5a on one end side, the inner wall portion 12a formed on the tube plates 4a to 5a is used as a partition for outer tube parts on these one end sides. Between the tube plate 4a and the tube plate 5a for the inner tube, the first for each of the inter-tube flow paths o in the first parallel group G1.
The first fluid header chamber 7a on one end side for the parallel group and the first fluid header chamber 7b on one end side for the second parallel group for each of the inter-tube flow paths o in the second parallel group G2 are defined. The inner wall portion 13a formed on the tube sheet 5a or the lid 6a by connecting the tube sheet 5a for the inner tube on the one end side and the lid 6a on the one end side.
As a partition, and the inner tube tube plate 5a on one end side thereof
And the lid 6a, the second fluid header chamber 8 on one end side for the first parallel group for each of the internal flow paths i in the first parallel group G1.
a and a second fluid header chamber 8b on one end side for the second parallel group with respect to each of the internal flow paths i in the second parallel group G2.

Reference numeral 9a denotes a conduit connection portion as a first fluid inlet / outlet for the first fluid header chamber 7a on the one end side for the first parallel group, and 9b denotes a first fluid on the one end side for the second parallel group. The conduit connection portion 10a as a first fluid inlet / outlet for the header chamber 7b is a conduit connection portion 10b as a second fluid inlet / outlet for the second fluid header chamber 8a on one end side for the first parallel group. Is a conduit connection portion as a second fluid inlet / outlet for the second fluid header chamber 8b on the one end side for the second parallel group.

On the other hand, on the other end side of the first and second parallel groups G1 and G2, the outer tube plate 4b for supporting the other end of each outer tube 1 and the other end of the outer tube 1 are provided. Tube plate 5b for the inner pipe on the other end side that supports the other end of each of the inner pipes 2 that protrudes beyond
And a lid 6b on the other end side, which is arranged outside the tube plate 5b for the inner pipe on the other end side in the tube direction.

By connecting the outer tube tube plate 4b on the other end side and the inner tube tube plate 5b on the other end side, the outer tube tube plate 4b and the inner tube tube plate 5b on the other end side are connected to each other. , A first fluid header chamber 7m on the other end side for inter-group passage with respect to each of the inter-tube flow paths o in the first and second parallel groups G1, G2, and an inner tube tube plate on the other end side 5b and the lid 6b on the other end side are connected to each other, so that the first and second parallel groups G1 and G are provided between the inner tube tube plate 5b and the lid 6b on the other end side.
The second fluid header chamber 8m is formed on the other end side for the inter-group crossing with respect to each of the internal flow paths i in 2.

That is, the first and second parallel groups G1 and G2
On the other end side of the above, due to the first fluid header chamber 7m for inter-group migration, a plurality of inter-pipe channels o in the first parallel group G1 and a plurality of inter-channel channels o in the second parallel group G2. And the plurality of internal flow paths o in the first parallel group G1 and the plurality of internal flow paths o in the second parallel group G2 by the second fluid header chamber 8m for intergroup transfer. And are connected in series.

Reference numeral 11 denotes a cylindrical body that surrounds the first and second parallel groups G1 and G2, and similarly to the second embodiment described above, one end of the cylindrical body 11 has an outer tube tube plate on the one end side. 4a
The outer tube tube plate 4b on the other end side is connected to the other end. In addition, the inside of the barrel 11 is defined by the inner wall portion 14.
It divides into the part which installs the 1st parallel group G1 and the part which installs the 2nd parallel group G2, and in each of these partition parts,
A heat insulating material (not shown) is provided on the inner peripheral surface portion of the barrel 11 and the wall surface portion of the inner wall portion 14 (in some cases, the entire inside of each partition portion including between the double pipes 3).

The cross-sectional structure of the double pipe heat exchanger in the third embodiment is the same as the structure shown in FIG.

In this double-tube heat exchanger, as a usage pattern, the first parallel group G1 and the second parallel group G2 are connected in series on the other end side, while the first parallel group G1 and the second parallel group G2 are connected on the other end side for the first parallel group. A plurality of first parallel groups G1 and second parallel groups G2 in which one of the first fluid header chamber 7a on one end side and the first fluid header chamber 7b on the one end side for the second parallel group is connected in series Between pipes o
To the first fluid distribution header chamber, and the other to the first fluid collection header chamber for the plurality of inter-tube flow paths o of the first parallel group G1 and the second parallel group G2 connected in series. .

Also, one of the second fluid header chamber 8a for the first parallel group and the second fluid header chamber 8b for the second parallel group is connected in series to form a first parallel. Group G
Second for the plurality of internal flow paths i of the first and second parallel groups G2
The header chamber for fluid distribution is used, and the other is used as the header chamber for collecting the second fluid for the plurality of internal flow paths i of the first parallel group G1 and the second parallel group G2 connected in series.

That is, the first fluid header chamber 7a on the one end side for the first parallel group is used as the header chamber for the first fluid distribution, and
In the case of a use example in which the second fluid header chamber 8b on the one end side for the second parallel group is used as the header chamber for the second fluid distribution, the first fluid A
Is supplied from the conduit connecting portion 9a to the first fluid header chamber 7a on the one end side for the first parallel group, as indicated by the solid line arrow in the figure, and the first fluid on the one end side for the first parallel group is formed. Fluid header chamber 7a
From the first parallel group G1 to the inter-tube flow paths o of the first parallel group G1, and the first fluid A passing through the inter-tube flow paths o of the first parallel group G1 is the first fluid on the other end side for inter-group crossing. The first fluid header chamber 7m on the other end side for the inter-group migration while being gathered in the header chamber 7m
Is redistributed to the inter-tube flow paths o of the second parallel group G2. Then, the heat-exchanged first fluid A that has passed through the inter-tube flow paths o of the second parallel group G2 is collected in the first fluid header chamber 7b on the one end side for the second parallel group, and this is collected. The heat-exchanged first fluid A is sent to the outside of the device from the pipe connection 9b.

On the other hand, the second fluid B is supplied from the conduit connection portion 10b to the second fluid header chamber 8b on the one end side for the second parallel group, as shown by the broken line arrow in the figure, The second fluid B that has been distributed from the second fluid header chamber 8b on the one end side for the second parallel group to each internal flow passage i of the second parallel group G2 and has passed through each internal flow passage i of the second parallel group G2 is , The second fluid header chamber 8m on the other end side for inter-group migration, and from the second fluid header chamber 8m on the other end side for inter-group migration to each internal flow passage i of the first parallel group G1. Redistribute. Then, the heat-exchanged second fluid B that has passed through the respective internal flow paths i of the first parallel group G1.
Are collected in the second fluid header chamber 8a on the one end side for the first parallel group, and the collected second fluid B having undergone heat exchange is sent out from the pipe connection portion 10a.

Cleaning and inspection / repair of the inter-pipe flow passages o and the internal flow passages i of the first and second parallel groups G1 and G2 are performed at one end side and the other end, as in the second embodiment. Side lid 6
a and 6b are removed to remove the first and second parallel groups G1 and G2.
In the state in which the internal flow path i of each inner pipe 2 is exposed to the outside and the inner pipe tube plates 5a and 5b on the one end side and the other end side are removed, the first and second parallel groups G1 and G2 It is carried out in a state where each inter-pipe flow path o is exposed to the outside.

In the apparatus posture in which the pipe direction is horizontal,
When used as an evaporator that causes the refrigerant to be evaporated in the refrigeration circuit as the first fluid A to flow in the inter-tube flow paths o and the fluid to be absorbed as the second fluid B to flow in each internal flow path i Among the first parallel group G1 and the second parallel group G2, in order to correspond to the decrease in the amount of the non-evaporated target refrigerant A that evaporates toward the downstream side of the inter-pipe flow path o with the gradual evaporation of the target refrigerant A,
In the parallel group positioned on the upstream side of the first fluid flow, as shown in FIG. 11, the inner pipe 2 is positioned at the center of the outer pipe 1, while in the parallel group positioned on the downstream side of the first fluid flow. , Figure 1
2 (a), an eccentric double tube structure is adopted in which the inner tube 2 is eccentric to the lower side with respect to the center of the outer tube 1 in the entire length of the outer tube 1, whereby the performance of the evaporator is improved. You may try to improve.

Further, in the apparatus posture in which the pipe direction is horizontal,
In the case of use as a condenser in which the refrigerant to be condensed in the refrigeration circuit is circulated as the first fluid A in each pipe flow path o and the fluid to be radiated as the second fluid B is circulated in each internal flow path i, the condensation is performed. Of the first parallel group G1 and the second parallel group G2, the uncondensed condensation target refrigerant A decreases toward the downstream side of the inter-pipe flow path o as the target refrigerant A gradually condenses.
In the parallel group positioned on the upstream side of the first fluid flow, as shown in FIG. 11, the inner pipe 2 is positioned at the center of the outer pipe 1, while in the parallel group positioned on the downstream side of the first fluid flow. , Figure 1
As shown in 3 (a), an eccentric double tube structure is adopted in which the inner tube 2 is extended over the entire length of the outer tube 1 and is eccentric to the upper side of the center of the outer tube 1, whereby the condenser performance is improved. May be improved.

Further, in adopting such an eccentric double pipe structure, when it is used as an evaporator, as shown in FIG. 12B, in the parallel group located on the downstream side of the first fluid flow. , A structure in which the inner pipe 2 extends over the entire length of the outer pipe 1 to contact the bottom of the inner peripheral surface of the outer pipe 1, and in the case of use as a condenser, in a parallel group located on the downstream side of the first fluid flow, As shown in (b) of 13, the structure is such that the inner pipe 2 extends over the entire length of the outer pipe 1 and is brought into contact with the upper portion of the inner peripheral surface of the outer pipe 1, whereby an unevaporated refrigerant to be evaporated and an uncondensed object to be condensed are condensed. In the parallel group on the downstream side where the amount of refrigerant decreases, heat conduction between the inner pipe 2 and the outer pipe 1 via the above contact portion causes
In addition to the inner tube 2, the outer tube 1 may function as a component of the heat transfer surface.

[Fourth Embodiment] FIG. 6 shows a double-tube heat exchanger according to a fourth embodiment. As a double-tube parallel group in which a plurality of double tubes 3 are arranged in parallel, a first parallel group G1 is provided. And the second parallel group G
2 are arranged in parallel, and in this arrangement, the first parallel group G1 and the second parallel group G2 are connected to the first and second fluids A and B.
In connection with each path in series, and in this series connection, the series connection location for the first fluid path and the series connection location for the second fluid path are distributed to one end side and the other end side, It is intended to be used as one heat exchanger.

Specifically, the first and second parallel groups G1 and G
On one end side of the outer tube 1, the outer tube tube plate 4a supporting one end of each outer tube 1 and one end side supporting each one end of the inner tube 2 protruding from one end of the outer tube 1 Tube plate 5 for tubes
a and a lid 6a on the one end side which is arranged outside the tube plate 5a for the inner pipe on the one end side in the tube direction.

By connecting the outer tube tube plate 4a on one end side and the inner tube tube plate 5a on one end side, the inner wall portion 12a formed on the tube plates 4a to 5a is used as a partition to form the outer tube on the one end side. Between the tube plate 4a and the tube plate 5a for the inner tube, the first for each of the inter-tube flow paths o in the first parallel group G1.
The first fluid header chamber 7a on one end side for the parallel group and the first fluid header chamber 7b on one end side for the second parallel group for each of the inter-tube flow paths o in the second parallel group G2 are defined. By connecting the inner tube tube plate 5a on one end side and the lid 6a on one end side, the inner tube tube plate 5a and the lid 6 on these one end sides are connected.
The second fluid header chamber 8m on the one end side for inter-group crossing with respect to each of the internal flow paths i in the first and second parallel groups G1 and G2 is formed with a.

Reference numeral 9a denotes a conduit connection portion as a first fluid inlet / outlet for the first fluid header chamber 7a on one end side for the first parallel group, and 9b denotes a first fluid on one end side for the second parallel group. It is a conduit connection portion as a first fluid inlet / outlet for the header chamber 7b.

On the other hand, on the other end side of the first and second parallel groups G1 and G2, the outer tube tube plate 4b on the other end side that supports the other end of each outer tube 1 and the other end of the outer tube 1 are provided. Tube plate 5b for the inner pipe on the other end side that supports the other end of each of the inner pipes 2 that protrudes beyond
And a lid 6b on the other end side, which is arranged outside the tube plate 5b for the inner pipe on the other end side in the tube direction.

By connecting the outer tube tube plate 4b on the other end side and the inner tube tube plate 5b on the other end side, the outer tube tube plate 4b and the inner tube tube plate 5b on the other end side are connected to each other. , A first fluid header chamber 7m on the other end side for inter-group passage with respect to each of the inter-tube flow paths o in the first and second parallel groups G1, G2, and an inner tube tube plate on the other end side 5b and the lid 6b on the other end side are connected to each other so that the inner wall portion 13a formed on the tube sheet 5b or the lid 6b serves as a partition, and the inner pipe tube sheet 5b and the lid 6b on the other end side are connected to each other. The second fluid header chamber 8a on the other end side for the first parallel group for each of the internal flow paths i in the first parallel group G1 and the second parallel group for each of the internal flow paths i in the second parallel group G2 Second fluid header chamber 8 on one end side of the
b is defined as a section.

Reference numeral 10a denotes a conduit connection portion as a second fluid inlet / outlet for the second fluid header chamber 8a on the other end side for the first parallel group, and 10b denotes a second fluid connection on the other end side for the second parallel group. It is a conduit connection portion as a second fluid inlet / outlet for the two-fluid header chamber 8b.

That is, the first and second parallel groups G1 and G2
On the other end side of the above, due to the first fluid header chamber 7m for inter-group migration, a plurality of inter-pipe channels o in the first parallel group G1 and a plurality of inter-channel channels o in the second parallel group G2. Are communicated in series, and at the one end sides of the first and second parallel groups G1 and G2, a plurality of internal flows in the first parallel group G1 are provided by the second fluid header chamber 8m for intergroup transfer. The path o and the plurality of internal flow paths o in the second parallel group G2 are connected in series.

Reference numeral 11 denotes a cylindrical body that surrounds the first and second parallel groups G1 and G2. As with the second and third embodiments described above, one end of the cylindrical body 11 has an outer end on the one end side. A tube plate 4a for pipes is connected to the other end of the tube plate 4b for outer pipes on the other end side. In addition, inside the barrel 11, an inner wall portion 14 is provided inside the first parallel group G1 and a second parallel group G2.
And the wall surface portion of the inner wall surface of the barrel 11 and the inner wall portion 14 (in some cases, the entire interior of each partition portion including the space between the double pipes 3). ) Is provided with a heat insulating material (not shown).

The cross-sectional structure of the double pipe heat exchanger in the fourth embodiment is the same as the structure shown in FIG.

In this double-tube heat exchanger, as a usage pattern, the first parallel group G1 and the second parallel group G2 are connected in series with respect to the inter-tube flow path o on the other end side at one end side. ,
A first fluid header chamber 7a on one end side for the first parallel group;
A first parallel group G1 and a second parallel group G2 in which either one of the first fluid header chamber 7b for the parallel group is connected in series.
And a second header group for fluid distribution for the plurality of inter-pipe passages o between the first parallel group G1 and the second parallel group G2 connected in series to the plurality of inter-pipe passages o. A header chamber for collecting one fluid.

Further, as opposed to the series connection of the first parallel group G1 and the second parallel group G2 with respect to the internal flow path i at one end side, at the other end side, the second parallel line at the other end side for the first parallel group is formed. Fluid header chamber 8a and second fluid header chamber 8 on the other end side for the second parallel group
b is a header chamber for distributing the second fluid to the plurality of internal flow paths i of the first parallel group G1 and the second parallel group G2 connected in series, and the other is connected in series. The header chamber for the second fluid collection is provided for the plurality of internal flow paths i of the first parallel group G1 and the second parallel group G2.

That is, the first fluid header chamber 7a on the one end side for the first parallel group is used as the header chamber for the first fluid distribution, and
In the case of a usage example in which the second fluid header chamber 8a on the other end side for the first parallel group is used as the header chamber for the second fluid distribution, the first fluid A
Is supplied from the conduit connecting portion 9a to the first fluid header chamber 7a on the one end side for the first parallel group, as indicated by the solid line arrow in the figure, and the first fluid on the one end side for the first parallel group is formed. Fluid header chamber 7a
From the first parallel group G1 to the inter-tube flow paths o of the first parallel group G1, and the first fluid A passing through the inter-tube flow paths o of the first parallel group G1 is the first fluid on the other end side for inter-group crossing. The first fluid header chamber 7m on the other end side for the inter-group migration while being gathered in the header chamber 7m
Is redistributed to the inter-tube flow paths o of the second parallel group G2. Then, the heat-exchanged first fluid A that has passed through the inter-tube flow paths o of the second parallel group G2 is collected in the first fluid header chamber 7b on the one end side for the second parallel group, and this is collected. The heat-exchanged first fluid A is sent to the outside of the device from the pipe connection 9b.

On the other hand, the second fluid B is supplied from the conduit connecting portion 10a to the second fluid header chamber 8a on the other end side for the first parallel group, as indicated by the broken line arrow in the figure, The second fluid that has been distributed from the second fluid header chamber 8a on the other end side for the first parallel group to each internal flow channel i of the first parallel group G1 and has passed through each internal flow channel i of the first parallel group G1. B is gathered in the second fluid header chamber 8m on one end side for inter-group migration, and from the second fluid header chamber 8m on one end side for inter-group migration to each internal flow passage i of the second parallel group G2. Redistribute. Then, the heat-exchanged second fluid B that has passed through the respective internal flow paths i of the second parallel group G2
Is collected in the second fluid header chamber 8b on the other end side for the second parallel group, and the collected second fluid B having undergone heat exchange is sent out from the pipe connection portion 10b.

Cleaning and inspection / repair of the inter-pipe flow passages o and the internal flow passages i of the first and second parallel groups G1 and G2 are the same as those in the second and third embodiments described above. And the lids 6a and 6b on the other end side are removed, and the first and second parallel groups G
1, in a state where the internal flow path i of each inner tube 2 in G2 is exposed to the outside, and also the inner tube tube sheet 5a on one end side and the other end side,
5b is removed, and each inter-tube flow path o in the first and second parallel groups G1 and G2 is exposed to the outside.

In the apparatus posture in which the pipe direction is horizontal, the refrigerant to be evaporated in the refrigerating circuit as the first fluid A is circulated through the inter-tube passages o, and the endothermic fluid as the second fluid B is the internal passages. In the case of use as an evaporator to be distributed to i,
As in the case of the third embodiment described above, among the first parallel group G1 and the second parallel group G2, in the parallel group positioned upstream of the first fluid flow, as shown in FIG. Is located at the center of the outer pipe 1, whereas in the parallel group located downstream of the first fluid flow, the inner pipe 2 is the outer pipe in the entire length of the outer pipe 1 as shown in FIG. An eccentric double-tube structure may be adopted in which the center is eccentric to the lower side. Further, in adopting this eccentric double-tube structure, a parallel group located on the downstream side of the first fluid flow. In FIG. 12, as shown in (b) of FIG. 12, a structure may be adopted in which the inner pipe 2 extends over the entire length of the outer pipe 1 and contacts the bottom of the inner peripheral surface of the outer pipe 1.

Further, in the apparatus posture in which the pipe direction is horizontal,
In the case of use as a condenser in which the refrigerant to be condensed in the refrigeration circuit is circulated as the first fluid A in each inter-tube flow path o and the fluid to be radiated as the second fluid B is circulated in each internal flow path i Also in the parallel group located upstream of the first fluid flow among the first parallel group G1 and the second parallel group G2, as in the case of the third embodiment described above, as shown in FIG. 2 is located in the central portion of the outer pipe 1, while in the parallel group located downstream of the first fluid flow, the inner pipe 2 is arranged in the entire length of the outer pipe 1 as shown in FIG. You may employ | adopt the eccentric double pipe structure which makes the upper pipe eccentric with respect to the center, and when adopting this eccentric double pipe structure,
In the parallel group located downstream of the first fluid flow, FIG.
As shown in FIG. 3B, a structure may be adopted in which the inner pipe 2 extends over the entire length of the outer pipe 1 and contacts the upper portion of the inner peripheral surface of the outer pipe 1.

[Fifth Embodiment] FIG. 7 shows a double-tube heat exchanger according to a fifth embodiment. As a double-tube parallel group in which a plurality of double tubes 3 are arranged in parallel, a first parallel group G1 is provided. And the second parallel group G
2 are arranged in parallel, and in this arrangement, the first parallel group G1 and the second parallel group G2 are connected in series for the path of the first fluid A and for the path of the second fluid B. It is used as a heat exchanger having two independent paths.

Specifically, the first and second parallel groups G1 and G
On one end side of the outer tube 1, the outer tube tube plate 4a supporting one end of each outer tube 1 and one end side supporting each one end of the inner tube 2 protruding from one end of the outer tube 1 Tube plate 5 for tubes
a and a lid 6a on the one end side which is arranged outside the tube plate 5a for the inner pipe on the one end side in the tube direction.

By connecting the outer tube tube plate 4a on one end side and the inner tube tube sheet 5a on one end side, the inner wall portion 12a formed on the tube plates 4a to 5a serves as a partition, and the outer tube part on the one end side is formed. Between the tube plate 4a and the tube plate 5a for the inner tube, the first for each of the inter-tube flow paths o in the first parallel group G1.
The first fluid header chamber 7a on one end side for the parallel group and the first fluid header chamber 7b on one end side for the second parallel group for each of the inter-tube flow paths o in the second parallel group G2 are defined. The inner wall portion 13a formed on the tube sheet 5a or the lid 6a by connecting the tube sheet 5a for the inner tube on the one end side and the lid 6a on the one end side.
As a partition, and the inner tube tube plate 5a on one end side thereof
And the lid 6a, the second fluid header chamber 8 on one end side for the first parallel group for each of the internal flow paths i in the first parallel group G1.
a and a second fluid header chamber 8c on one end side for the second parallel group with respect to each of the internal flow paths i in the second parallel group G2.

Reference numeral 9a denotes a conduit connection portion as a first fluid inlet / outlet for the first fluid header chamber 7a on the one end side for the first parallel group, and 9b denotes a first fluid on the one end side for the second parallel group. The conduit connection portion 10a as a first fluid inlet / outlet for the header chamber 7b is a conduit connection portion 10c as a second fluid inlet / outlet for the second fluid header chamber 8a on one end side for the first parallel group. Is a conduit connection portion as a second fluid inlet / outlet for the second fluid header chamber 8c on the one end side for the second parallel group.

On the other hand, on the other end side of the first and second parallel groups G1 and G2, the outer tube plate 4b for supporting the other end of each outer tube 1 and the other end of the outer tube 1 are provided. Tube plate 5b for the inner pipe on the other end side that supports the other end of each of the inner pipes 2 that protrudes beyond
And a lid 6b on the other end side, which is arranged outside the tube plate 5b for the inner pipe on the other end side in the tube direction.

By connecting the outer tube tube plate 4b on the other end side and the inner tube tube sheet 5b on the other end side, the outer tube tube plate 4b and the inner tube tube plate 5b on the other end side are connected to each other. , A first fluid header chamber 7m on the other end side for inter-group passage with respect to each of the inter-tube flow paths o in the first and second parallel groups G1, G2, and an inner tube tube plate on the other end side By connecting 5b and the lid 6b on the other end side, the inner wall portion 13b formed on the tube sheet 5b or the lid 6b is used as a partition, and between the inner tube tube sheet 5b and the lid 6b on the other end side, The second fluid header chamber 8b on the other end side for the first parallel group for each of the internal flow paths i in the first parallel group G1 and the second parallel group for each of the internal flow paths i in the second parallel group G2 Second fluid header chamber 8 on the other end side of
This is a structure that partitions and forms d.

Reference numeral 10b denotes a pipe connecting portion as a second fluid inlet / outlet for the second fluid header chamber 8b on the other end side for the first parallel group, and 10d denotes a second fluid connection on the other end side for the second parallel group. It is a conduit connection portion as a second fluid inlet / outlet for the two-fluid header chamber 8d.

That is, regarding the inter-tube flow path o, the first parallel group G1 is provided on the other end side of the first and second parallel groups G1 and G2 by the first fluid header chamber 7m for inter-group migration.
The plurality of inter-tube flow paths o therein are connected in series with the plurality of inter-tube flow paths o in the second parallel group G2.

Reference numeral 11 denotes a cylindrical body that surrounds the first and second parallel groups G1 and G2. As with the second to fourth embodiments described above, one end of the cylindrical body 11 has an outer end on the one end side. A tube plate 4a for pipes is connected to the other end of the tube plate 4b for outer pipes on the other end side. In addition, inside the barrel 11, an inner wall portion 14 is provided inside the first parallel group G1 and a second parallel group G2.
And the wall surface portion of the inner wall surface of the barrel 11 and the inner wall portion 14 (in some cases, the entire interior of each partition portion including the space between the double pipes 3). ) Is provided with a heat insulating material (not shown).

The cross sectional structure of the double pipe heat exchanger in the fifth embodiment is equal to the structure shown in FIG.

In this double-tube heat exchanger, as a usage pattern, the first parallel group G1 and the second parallel group G2 are connected in series with respect to the inter-tube flow path o on the other end side at one end side. ,
A first fluid header chamber 7a on one end side for the first parallel group;
A first parallel group G1 and a second parallel group G2 in which either one of the first fluid header chamber 7b for the parallel group is connected in series.
And a second header group for fluid distribution for the plurality of inter-pipe passages o between the first parallel group G1 and the second parallel group G2 connected in series to the plurality of inter-pipe passages o. A header chamber for collecting one fluid.

Regarding the internal flow passage i, one of the second fluid header chamber 8a for the first parallel group on the one end side and the second fluid header chamber 8b on the other end side for the first parallel group is provided. To
A second fluid distribution header chamber for the plurality of internal flow passages i of the first parallel group G1 and a second fluid collection header chamber for the plurality of internal flow passages i of the first parallel group G1. .

Further, one of the second fluid header chamber 8c on the one end side for the second parallel group and the second fluid header chamber 8d on the other end side for the second parallel group is connected to the second parallel group G2. The second fluid distribution header chamber for the plurality of internal flow passages i, and the other header chamber for the second fluid collection for the plurality of internal flow passages i of the second parallel group G2.

That is, the first fluid header chamber 7a on the one end side for the first parallel group is used as the header chamber for the first fluid distribution, and the internal flow passage i of the first parallel group G1 is The second fluid header chamber 8b on the other end side of the second parallel group is used as the header chamber for the second fluid distribution, and the internal flow path i of the second parallel group G2 is the second fluid on the one end side of the second parallel group. Header room 8
In the case of the use example in which c is the header chamber for the second fluid distribution, the first fluid A is the first fluid A from the conduit connection portion 9a on the one end side for the first parallel group, as indicated by the solid arrow in the figure. Fluid header chamber 7a
To distribute to each inter-tube flow path o of the first parallel group G1 from the first fluid header chamber 7a on the one end side for the first parallel group,
The first fluid A that has passed through the inter-tube flow paths o of the first parallel group G1
Is collected in the first fluid header chamber 7m on the other end side for group transfer, and the inter-tube flow paths of the second parallel group G2 from the first fluid header chamber 7m on the other end side for group transfer redistribute to o. Then, the heat-exchanged first fluid A that has passed through the inter-tube flow paths o of the second parallel group G2 is collected in the first fluid header chamber 7b on the one end side for the second parallel group, and this is collected. The heat-exchanged first fluid A is sent to the outside of the device from the conduit connection portion 9b.

On the other hand, the second parallel to the first parallel group G1
The fluid B (B1) is supplied from the pipe line connecting portion 10b to the second fluid header chamber 8b on the other end side for the first parallel group, as indicated by the broken line arrow in the figure, for the first parallel group. The other end of the second
It distributes from the fluid header chamber 8b to each internal flow path i of the first parallel group G1. Then, the heat-exchanged second fluid B (B1) that has passed through each internal flow path i of the first parallel group G1 is collected in the second fluid header chamber 8a on the one end side for the first parallel group, and this collection is performed. The heat-exchanged second fluid B (B1) is sent to the outside of the device from the conduit connection portion 10a on the one end side.

Also, the second fluid B for the second parallel group G2
(B2) shows the second fluid header chamber 8 on the one end side for the second parallel group from the conduit connection portion 10c, as indicated by the dashed arrow in the figure.
It is supplied to c and distributed from the second fluid header chamber 8c on the one end side for the second parallel group to each internal flow passage i of the second parallel group G2. Then, the heat-exchanged second fluid B (B2) that has passed through each internal flow path i of the second parallel group G2 is collected in the second fluid header chamber 8d on the other end side for the second parallel group, The collected heat-exchanged second fluid B (B2) is sent out from the pipe connection portion 10d.

The second fluid B1 flowing in the internal flow passage i of the first parallel group G1 and the second fluid B2 flowing in the internal flow passage i of the second parallel group G2 are different from each other, or
Any of the same kind may be used.

Cleaning and inspection / repair of the inter-pipe flow passages o and the internal flow passages i of the first and second parallel groups G1 and G2 are performed on one end side and the other end side as in the above-described embodiments. Lid 6
a and 6b are removed to remove the first and second parallel groups G1 and G2.
In the state in which the internal flow path i of each inner pipe 2 is exposed to the outside and the inner pipe tube plates 5a and 5b on the one end side and the other end side are removed, the first and second parallel groups G1 and G2 It is carried out in a state where each inter-pipe flow path o is exposed to the outside.

In the apparatus posture in which the pipe direction is horizontal, the refrigerant to be evaporated in the refrigeration circuit as the first fluid A is circulated through the inter-tube flow paths o, and the second fluid B (B1) for the first parallel group G1 is used. , And the second fluid B for the second parallel group G2
As (B2), in the case of use as an evaporator that circulates the heat-absorption target fluid in each internal flow path i, the first parallel group G1 and the second parallel group G1 are used as in the third and fourth embodiments. In the parallel group located upstream of the first fluid flow in the group G2, as shown in FIG. 11, the inner pipe 2 is located in the center of the outer pipe 1, while the inner pipe 2 is located downstream of the first fluid flow. In the parallel group located on the side, as shown in (a) of FIG. 12, an eccentric double pipe structure in which the inner pipe 2 is eccentric to the center of the outer pipe 1 downward in the entire length of the outer pipe 1 is adopted. In addition, in adopting this eccentric double pipe structure, in the parallel group positioned on the downstream side of the first fluid flow, as shown in FIG. It is also possible to adopt a structure in which the outer pipe 1 is in contact with the bottom portion of the inner peripheral surface over the entire length thereof.

Further, in the apparatus posture in which the pipe direction is horizontal,
The refrigerant to be condensed in the refrigeration circuit as the first fluid A is circulated through the inter-tube flow paths o, and the second fluid B (B1) for the first parallel group G1 and the second fluid B for the second parallel group G2 are used.
When the fluid B (B2) is used as a condenser that circulates the heat-dissipation target fluid in each internal flow path i, the first parallel group G is also used as in the third and fourth embodiments.
In the parallel group located upstream of the first fluid flow among the first and second parallel groups G2, as shown in FIG. 11, the inner tube 2 is located at the center of the outer tube 1, whereas In the parallel group positioned on the downstream side of the one fluid flow, as shown in FIG. 13A, the eccentric double structure in which the inner tube 2 is eccentric to the center of the outer tube 1 with respect to the entire length of the outer tube 1. A tube structure may be adopted, and in adopting this eccentric double tube structure, in the parallel group located on the downstream side of the first fluid flow, as shown in (b) of FIG. It is also possible to adopt a structure in which the outer tube 1 is extended over the entire length of the outer tube 1 and is in contact with the upper portion of the inner peripheral surface of the outer tube 1.

As a modification of the double tube heat exchanger of the fifth embodiment, as shown in FIG. 8, the first parallel group G1 is used.
It is conceivable that the and the second parallel group G2 are used as a heat exchanger in which two paths of the second fluid B are connected in series and two independent paths of the first fluid A are formed.

That is, at one end side of the first and second parallel groups G1 and G2, by connecting the outer tube tube sheet 4a at one end side to the inner tube tube sheet 5a at one end side, the tube sheets 4a to 5a are connected. One end for the first parallel group for each of the inter-tube flow paths o in the first parallel group G1 is provided between the outer tube tube sheet 4a and the inner tube tube sheet 5a on the one end side with the formed inner wall portion 12a as a partition. Side first fluid header chamber 7a and the second parallel group G2
The first fluid header chamber 7c on the one end side for the second parallel group for each of the inter-tube flow paths o is partitioned and formed, and the inner pipe tube sheet 5a on the one end side and the lid 6a on the one end side are connected. By doing so, the inner wall 13a formed on the tube sheet 5a or the lid 6a is used as a partition, and the inner tube tube sheet 5a and the lid 6 on these one end sides are formed.
a second fluid header chamber 8a on one end side for the first parallel group with respect to each of the internal flow paths i in the first parallel group G1,
The second fluid header chamber 8b on one end side for the second parallel group with respect to each of the internal flow paths i in the second parallel group G2 is defined and formed.

On the other end side of the first and second parallel groups G1 and G2, the tube plate for outer tube 4b on the other end side and the tube plate for inner tube 5b on the other end side are connected to each other. The inner wall portion 12b formed in 4b to 5b is used as a partition, and between the outer tube tube sheet 4b and the inner tube tube sheet 5b on the other end side,
The first fluid header chamber 7b on the other end side for the first parallel group for each of the inter-tube flow paths o in the first parallel group G1, and the second parallel group G
The first fluid header chamber 7d on the other end side for the second parallel group with respect to each of the inter-tube flow paths o in 2 is defined and formed, and the inner tube tube plate 5b on the other end side and the other end side lid are formed. By connecting 6b with the inner tube tube plate 5b and the lid 6b on the other end side, the internal flow passage i in the first and second parallel groups G1, G2 is formed.
The second fluid header chamber 8m on the other end side for group migration for each of the above is formed.

Reference numeral 9a denotes a pipe connection portion as a first fluid inlet / outlet for the first fluid header chamber 7a on the one end side for the first parallel group, and 9c denotes a first fluid on the one end side for the second parallel group. The conduit connection portion 10a as a first fluid inlet / outlet for the header chamber 7c is a conduit connection portion 10b as a second fluid inlet / outlet for the second fluid header chamber 8a on one end side for the first parallel group. Is a conduit connection portion as a second fluid inlet / outlet for the second fluid header chamber 8b on one end side for the second parallel group, and 9b is a first end on the other end side for the first parallel group. A conduit connection portion as a first fluid inlet / outlet for the fluid header chamber 7b, and 9d is a conduit connection portion as a first fluid inlet / outlet for the first fluid header chamber 7d on the other end side for the second parallel group. Is.

Note that the modification shown in FIG.
Similar to the fifth embodiment, the first fluid A (A1) to be circulated in the inter-tube flow path o of the first parallel group G1 and the second parallel group G2.
The first fluid A (A2) to be circulated in the inter-tube flow path o may be of different types or of the same type, and in use as an evaporator or condenser. An eccentric double pipe structure with an inner pipe inclined arrangement similar to that of the second embodiment described above may be adopted.

[Sixth Embodiment] FIG. 9 shows a double-tube heat exchanger according to a sixth embodiment. As a double-tube parallel group in which a plurality of double tubes 3 are arranged in parallel, a first parallel group G1 is provided. And the second parallel group G
2 and 2 are arranged in parallel, and in this arrangement, two double-tube heat exchangers are substantially connected in series as in the third embodiment.

Specifically, the first and second parallel groups G1, G
On one end side of the outer tube 1, the outer tube tube plate 4a supporting one end of each outer tube 1 and one end side supporting each one end of the inner tube 2 protruding from one end of the outer tube 1 Tube plate 5 for tubes
a and a lid 6a on the one end side which is arranged outside the tube plate 5a for the inner pipe on the one end side in the tube direction.

By connecting the outer tube tube plate 4a on one end side and the inner tube tube sheet 5a on one end side, the inner wall portion 12a formed on the tube plates 4a to 5a is used as a partition for outer tube parts on these one end sides. Between the tube plate 4a and the tube plate 5a for the inner tube, the first for each of the inter-tube flow paths o in the first parallel group G1.
The first fluid header chamber 7a on one end side for the parallel group and the first fluid header chamber 7b on one end side for the second parallel group for each of the inter-tube flow paths o in the second parallel group G2 are defined. The inner wall portion 13a formed on the tube sheet 5a or the lid 6a by connecting the tube sheet 5a for the inner tube on the one end side and the lid 6a on the one end side.
As a partition, and the inner tube tube plate 5a on one end side thereof
And the lid 6a, the second fluid header chamber 8 on one end side for the first parallel group for each of the internal flow paths i in the first parallel group G1.
a and a second fluid header chamber 8b on one end side for the second parallel group with respect to each of the internal flow paths i in the second parallel group G2.

Reference numeral 9a denotes a conduit connection portion as a first fluid inlet / outlet for the first fluid header chamber 7a on the one end side for the first parallel group, and 9b denotes a first fluid on the one end side for the second parallel group. The conduit connection portion 10a as a first fluid inlet / outlet for the header chamber 7b is a conduit connection portion 10b as a second fluid inlet / outlet for the second fluid header chamber 8a on one end side for the first parallel group. Is a conduit connection portion as a second fluid inlet / outlet for the second fluid header chamber 8b on the one end side for the second parallel group.

On the other hand, on the other end side of the first and second parallel groups G1 and G2, the outer tube tube plate 4b for supporting the other end of each outer tube 1 and the outer tube on the other end side There is provided a lid 6b on the other end side which is arranged on the outer side in the tube direction with respect to the tube plate 4b for tubes.

By connecting the outer tube tube plate 4b on the other end side and the lid 6b on the other end side, the first and the outer tube tubes 4b on the other end side and the lid 6b are connected to each other. The first fluid header chamber 7m on the other end side for group transfer is formed for each of the inter-tube flow paths o in the second parallel groups G1, G2, and the first fluid header chamber 7m on the other end side for group transfer is formed. Inside the fluid header chamber 7m, each of the inner pipes 2 in the first parallel group G1 and each of the inner pipes 2 in the second parallel group G2 are individually connected via the inner pipe connecting pipe 15. There is.

That is, the first and second parallel groups G1 and G2
On the other end side of the above, due to the first fluid header chamber 7m for inter-group migration, a plurality of inter-pipe channels o in the first parallel group G1 and a plurality of inter-channel channels o in the second parallel group G2. And a plurality of internal flow passages i in the first parallel group G1 and a plurality of internal flow passages i in the second parallel group G2 by connecting the pipes in series with each other and connecting the individual pipes by the crossover pipes 15 for inner pipes. Are connected in series.

Reference numeral 11 denotes a cylindrical body that surrounds the first and second parallel groups G1 and G2. Like the above-described embodiments, one end of the cylindrical body 11 has the outer tube tube plate 4a on the one end side. , The other end is connected to the outer tube tube plate 4b on the other end side,
The inside of the barrel 11 is divided by the inner wall portion 14 into a portion containing the first parallel group G1 and a portion containing the second parallel group G2, and the inner circumference of the barrel 11 is divided into each of these divided portions. A heat insulating material (not shown) is provided on the surface portion and the wall surface portion of the inner wall portion 14 (in some cases, the entire interior of each partition portion including between the double pipes 3).

The cross sectional structure of the double pipe heat exchanger in the sixth embodiment is the same as the structure shown in FIG.

In this double-tube heat exchanger, as a usage pattern, as in the third embodiment described above, one end is connected to the first parallel group G1 and the second parallel group G2 connected in series on the other end side. Side, one end side first fluid header chamber 7a for the first parallel group
And one of the first fluid header chambers 7b on the one end side for the second parallel group, the first parallel group G1 and the second parallel group G2, which are connected in series The header chamber for fluid distribution is used, and the other is used as the header chamber for the first fluid collection for the plurality of inter-pipe flow paths o of the first parallel group G1 and the second parallel group G2 connected in series.

Further, one of the second fluid header chamber 8a on the one end side for the first parallel group and the second fluid header chamber 8b on the one end side for the second parallel group is connected in series as a first parallel. Group G
Second for the plurality of internal flow paths i of the first and second parallel groups G2
The header chamber for fluid distribution is used, and the other is used as the header chamber for collecting the second fluid for the plurality of internal flow paths i of the first parallel group G1 and the second parallel group G2 connected in series.

That is, the first fluid header chamber 7a on the one end side for the first parallel group is used as the header chamber for the first fluid distribution, and
In the case of a use example in which the second fluid header chamber 8b on the one end side for the second parallel group is used as the header chamber for the second fluid distribution, the first fluid A
Is supplied from the conduit connecting portion 9a to the first fluid header chamber 7a on the one end side for the first parallel group, as indicated by the solid line arrow in the figure, and the first fluid on the one end side for the first parallel group is formed. Fluid header chamber 7a
From the first parallel group G1 to the inter-tube flow paths o of the first parallel group G1, and the first fluid A passing through the inter-tube flow paths o of the first parallel group G1 is the first fluid on the other end side for inter-group crossing. The first fluid header chamber 7m on the other end side for the inter-group migration while being gathered in the header chamber 7m
Is redistributed to the inter-tube flow paths o of the second parallel group G2. Then, the heat-exchanged first fluid A that has passed through the inter-tube flow paths o of the second parallel group G2 is collected in the first fluid header chamber 7b on the one end side for the second parallel group, and this is collected. The heat-exchanged first fluid A is sent to the outside of the device from the pipe connection 9b.

On the other hand, the second fluid B is supplied from the conduit connecting portion 10b to the second fluid header chamber 8b on the one end side for the second parallel group, as shown by the broken line arrow in the figure, The second fluid B that has been distributed from the second fluid header chamber 8b on the one end side for the second parallel group to each internal flow passage i of the second parallel group G2 and has passed through each internal flow passage i of the second parallel group G2 is , Through the inner pipe crossover pipe 15 to each internal flow path i of the first parallel group G1. And the first
The heat-exchanged second fluid B that has passed through each internal flow path i of the parallel group G1 is the second fluid header chamber 8a for the first parallel group on one end side.
The heat-exchanged second fluid B is sent to the outside of the device through the pipe connection portion 10a.

Cleaning, inspection, and repair of the inter-pipe flow passages o and the internal flow passages i of the first and second parallel groups G1 and G2 are performed by using the lids 6a and 6b on the one end side and the other end side and the inside of the one end side. Tube plate for pipe 5a
Is removed and, if necessary, the crossover pipes 15 for inner pipes are removed to expose the internal flow passages i and the inter-pipe flow passages o in the first and second parallel groups G1 and G2 to the outside. To implement.

In the apparatus posture in which the pipe direction is horizontal, the refrigerant to be evaporated in the refrigeration circuit as the first fluid A is circulated through the inter-tube passages o, and the heat absorption target fluid as the second fluid B is the internal passages. In the case of use as an evaporator to be distributed to i,
As in the case of the third embodiment described above, among the first parallel group G1 and the second parallel group G2, in the parallel group positioned upstream of the first fluid flow, as shown in FIG. Is located at the center of the outer pipe 1, whereas in the parallel group located downstream of the first fluid flow, the inner pipe 2 is the outer pipe in the entire length of the outer pipe 1 as shown in FIG. An eccentric double-tube structure may be adopted in which the center is eccentric to the lower side. Further, in adopting this eccentric double-tube structure, a parallel group located on the downstream side of the first fluid flow. In FIG. 12, as shown in (b) of FIG. 12, a structure may be adopted in which the inner pipe 2 extends over the entire length of the outer pipe 1 and contacts the bottom of the inner peripheral surface of the outer pipe 1.

Further, in the apparatus posture in which the pipe direction is horizontal,
In the case of use as a condenser in which the refrigerant to be condensed in the refrigeration circuit is circulated as the first fluid A in each inter-tube flow path o and the fluid to be radiated as the second fluid B is circulated in each internal flow path i Also in the parallel group located upstream of the first fluid flow among the first parallel group G1 and the second parallel group G2, as in the case of the third embodiment described above, as shown in FIG. 2 is located in the central portion of the outer pipe 1, while in the parallel group located downstream of the first fluid flow, the inner pipe 2 is arranged in the entire length of the outer pipe 1 as shown in FIG. You may employ | adopt the eccentric double pipe structure which makes the upper pipe eccentric with respect to the center, and when adopting this eccentric double pipe structure,
In the parallel group located downstream of the first fluid flow, FIG.
As shown in FIG. 3B, a structure may be adopted in which the inner pipe 2 extends over the entire length of the outer pipe 1 and contacts the upper portion of the inner peripheral surface of the outer pipe 1.

[Seventh Embodiment] FIG. 10 shows a double-tube heat exchanger according to a seventh embodiment. As a double-tube parallel group in which a plurality of double tubes 3 are arranged in parallel, a first parallel group G1 is provided. And the second parallel group G2 are arranged in parallel, and in this arrangement, as in the third and sixth embodiments, substantially two double-tube heat exchangers are connected in series. .

Specifically, the first and second parallel groups G1, G
On one end side of the outer tube 1, the outer tube tube plate 4a supporting one end of each outer tube 1 and one end side supporting each one end of the inner tube 2 protruding from one end of the outer tube 1 Tube plate 5 for tubes
a and a lid 6a on the one end side which is arranged outside the tube plate 5a for the inner pipe on the one end side in the tube direction.

By connecting the outer tube tube plate 4a on one end side and the inner tube tube sheet 5a on one end side, the inner wall portion 12a formed on the tube plates 4a to 5a serves as a partition, and the outer tube part on the one end side is formed. Between the tube plate 4a and the tube plate 5a for the inner tube, the first for each of the inter-tube flow paths o in the first parallel group G1.
The first fluid header chamber 7a on one end side for the parallel group and the first fluid header chamber 7b on one end side for the second parallel group for each of the inter-tube flow paths o in the second parallel group G2 are defined. The inner wall portion 13a formed on the tube sheet 5a or the lid 6a by connecting the tube sheet 5a for the inner tube on the one end side and the lid 6a on the one end side.
As a partition, and the inner tube tube plate 5a on one end side thereof
And the lid 6a, the second fluid header chamber 8 on one end side for the first parallel group for each of the internal flow paths i in the first parallel group G1.
a and a second fluid header chamber 8b on one end side for the second parallel group with respect to each of the internal flow paths i in the second parallel group G2.

Reference numeral 9a denotes a conduit connection portion as a first fluid inlet / outlet for the first fluid header chamber 7a on the one end side for the first parallel group, and 9b denotes a first fluid on the one end side for the second parallel group. The conduit connection portion 10a as a first fluid inlet / outlet for the header chamber 7b is a conduit connection portion 10b as a second fluid inlet / outlet for the second fluid header chamber 8a on one end side for the first parallel group. Is a conduit connection portion as a second fluid inlet / outlet for the second fluid header chamber 8b on the one end side for the second parallel group.

On the other hand, on the other end sides of the first and second parallel groups G1 and G2, the outer tubes 1 in the first parallel group G1 are
Each of the outer tubes 1 in the second parallel group G2 is connected to the outer tube crossover tube 1
6 and the inner pipes 2 in the first parallel group G1 and the inner pipes 2 in the second parallel group G2 are individually connected via the inner pipe connecting pipe 15. It is as a structure.

That is, the first and second parallel groups G1 and G2
On the other end side of the above, by the individual pipe connection by the outer pipe crossover pipe 16, a plurality of inter-pipe passages o in the first parallel group G1 and a plurality of inter-pipe passages o in the second parallel group G2 are formed. Are connected in series, and a plurality of internal flow passages i in the first parallel group G1 and a plurality of internal flow passages i in the second parallel group G2 are formed by the individual pipe connections made by the inner pipe crossover pipe 15. It is designed to communicate in series.

The double-tube heat exchanger according to the seventh embodiment has the same cross-sectional structure as that shown in FIG.

In this double-tube heat exchanger, the first parallel group G1 and the second parallel group G2 are connected in series on the other end side, as in the third and sixth embodiments. On the other hand, on one end side, the first fluid header chamber 7a on the one end side for the first parallel group and the first fluid header chamber 7 on the one end side for the second parallel group
Any one of b and b is used as a header chamber for first fluid distribution with respect to the plurality of inter-tube flow paths o of the first parallel group G1 and the second parallel group G2 connected in series, and the other is connected in series. The header chamber for the first fluid collection is provided for the plurality of inter-pipe passages o of the first parallel group G1 and the second parallel group G2.

In addition, one of the second fluid header chamber 8a on the one end side for the first parallel group and the second fluid header chamber 8b on the one end side for the second parallel group is connected in series as a first parallel. Group G
Second for the plurality of internal flow paths i of the first and second parallel groups G2
The header chamber for fluid distribution is used, and the other is used as the header chamber for collecting the second fluid for the plurality of internal flow paths i of the first parallel group G1 and the second parallel group G2 connected in series.

That is, the first fluid header chamber 7a on the one end side for the first parallel group is used as the header chamber for the first fluid distribution, and
In the case of a use example in which the second fluid header chamber 8b on the one end side for the second parallel group is used as the header chamber for the second fluid distribution, the first fluid A
Is supplied from the conduit connecting portion 9a to the first fluid header chamber 7a on the one end side for the first parallel group, as indicated by the solid line arrow in the figure, and the first fluid on the one end side for the first parallel group is formed. Fluid header chamber 7a
From the first parallel group G1 to the inter-tube flow paths o of the first parallel group G1 and passed through the inter-tube flow paths o of the first parallel group G1. It leads to each channel o between pipes. The heat-exchanged first fluid A that has passed through the inter-tube flow paths o of the second parallel group G2 is the first fluid on the one end side for the second parallel group.
The heat-exchanged first fluid A collected in the fluid header chamber 7b is sent out from the pipe connection portion 9b.

On the other hand, the second fluid B is supplied from the conduit connecting portion 10b to the second fluid header chamber 8b on the one end side for the second parallel group, as shown by the broken line arrow in the figure, The second fluid B that has been distributed from the second fluid header chamber 8b on the one end side for the second parallel group to each internal flow passage i of the second parallel group G2 and has passed through each internal flow passage i of the second parallel group G2 is , Through the inner pipe crossover pipe 15 to each internal flow path i of the first parallel group G1. And the first
The heat-exchanged second fluid B that has passed through each internal flow path i of the parallel group G1 is the second fluid header chamber 8a for the first parallel group on one end side.
The heat-exchanged second fluid B is sent to the outside of the device through the pipe connection portion 10a.

For cleaning, inspecting and repairing the inter-tube flow paths o and the internal flow paths i of the first and second parallel groups G1 and G2, remove the lid 6a on one end side and the tube plate 5a for the inner tube, and If necessary, the crossover pipe 15 for each inner pipe and the crossover pipe 16 for each outer pipe
Is removed, and the internal flow passage i and the inter-pipe flow passage o in the first and second parallel groups G1 and G2 are exposed to the outside.

In the device posture in which the pipe direction is horizontal,
In the case of use as an evaporator in which the refrigerant to be evaporated in the refrigeration circuit as the first fluid A is circulated in the inter-tube flow paths o and the fluid to be endothermic as the second fluid B is circulated in each internal flow path i, Similar to the third and sixth embodiments of the first
Among the parallel group G1 and the second parallel group G2, in the parallel group located upstream of the first fluid flow, the inner pipe 2 is located at the center of the outer pipe 1, as shown in FIG. In the parallel group located on the downstream side of the first fluid flow, as shown in (a) of FIG. 12, the eccentricity 2 which eccentricizes the inner tube 2 downward with respect to the center of the outer tube 1 in the entire length of the outer tube 1. A heavy pipe structure may be adopted, and further, in adopting this eccentric double pipe structure,
In the parallel group located downstream of the first fluid flow, FIG.
As shown in FIG. 2B, a structure may be adopted in which the inner pipe 2 extends over the entire length of the outer pipe 1 and is brought into contact with the bottom portion of the inner peripheral surface of the outer pipe 1.

Further, in the device posture in which the pipe direction is horizontal,
In the case of use as a condenser in which the refrigerant to be condensed in the refrigeration circuit is circulated as the first fluid A in each inter-tube flow path o and the fluid to be radiated as the second fluid B is circulated in each internal flow path i Similarly to the third and sixth embodiments described above, in the first parallel group G1 and the second parallel group G2, the parallel group positioned on the upstream side of the first fluid flow is as shown in FIG. While the inner pipe 2 is located at the center of the outer pipe 1, in the parallel group located on the downstream side of the first fluid flow, as shown in FIG. In the above, an eccentric double pipe structure may be adopted in which the outer pipe 1 is eccentric to the upper side. Further, in adopting this eccentric double pipe structure, it is located on the downstream side of the first fluid flow. In the parallel group, as shown in (b) of FIG. 13, the inner pipe 2 extends over the entire length of the outer pipe 1 and The structure for contacting the peripheral surface top may be adopted.

Another Embodiment Next, another embodiment will be listed. The first fluid A that circulates in the inter-pipe channel o and the second fluid B that circulates in the internal channel i and exchanges heat with the first fluid A are the evaporation target refrigerant and the condensation target refrigerant in the refrigeration circuit, and The fluid to be absorbed and radiated for evaporating or condensing these refrigerants is not limited, and may be water or other various liquids, or air or other various gases.

Outer tube tube plates 4a, 4b, inner tube tube plate 5a,
Each of 5b and the lids 6a and 6b may be formed of a single member, or may be formed by connecting a plurality of divided members.

Outer tube tube plates 4a, 4b and inner tube tube plate 5a,
5b and an intermediate member between these outer tube tube plate 4
a, 4b, the inner tube tube plates 5a, 5b, and the intermediate member,
The first fluid header chambers 7a, 7b, 7c, 7d, 7m may be formed between the outer tube tube plates 4a, 4b and the inner tube tube plates 5a, 5b.

According to the sixth aspect of the present invention, the outer tube tube plate 4b and the lid 6b are connected to each other via an intermediate member between the outer tube tube plate 4b on the other end side and the lid 6b on the other end side. The first fluid header chamber 7m for intergroup transfer may be formed between the outer tube tube plate 4b and the lid 6b by the intermediate member.

The inner pipe tube plates 5a, 5b and the lids 6a, 6b are provided with an intermediate member, and the inner pipe tube plates 5a, 5b and the lids 6a, 6b and the intermediate member are used to form the inner pipe tube plate 5a, 5
b and the lids 6a, 6b between the second fluid header chambers 8a, 8b
The structure may be such that b, 8c, 8d and 8m are formed.

Each header chamber 7a-d, 8a-d, 7m, 8
The inlet and outlet portions of the outer pipe 1 and the inner pipe 2 with respect to m may be formed in a trumpet shape so as to smooth the fluid flow in the inlet and outlet portions of the inter-pipe passage o and the internal passage i.

It should be noted that although reference numerals are given in the claims for convenience of comparison with the drawings, the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a first embodiment.

FIG. 2 is a transverse sectional view showing the first embodiment.

FIG. 3 is a longitudinal sectional view showing a second embodiment.

FIG. 4 is a cross sectional view showing a second embodiment.

FIG. 5 is a longitudinal sectional view showing a third embodiment.

FIG. 6 is a vertical sectional view showing a fourth embodiment.

FIG. 7 is a vertical cross-sectional view showing a fifth embodiment.

FIG. 8 is a vertical sectional view showing a modified example of the fifth embodiment.

FIG. 9 is a longitudinal sectional view showing a sixth embodiment.

FIG. 10 is a vertical cross-sectional view showing a seventh embodiment.

FIG. 11 is a sectional view of a double pipe.

FIG. 12 is a sectional view of an eccentric double tube for an evaporator.

FIG. 13 is a sectional view of an eccentric double tube for condensation.

FIG. 14 is a diagram showing the basic structure of a conventional double-tube heat exchanger.

FIG. 15 is a view showing a combined structure of a conventional double-tube heat exchanger.

[Explanation of symbols]

 1 outer tube 2 inner tube 3 double tube G double tube parallel group G1 first parallel group G2 second parallel group A first fluid B second fluid 4a, 4b outer tube tube sheet 5a, 5b inner tube tube sheet 6a, 6b Lid 7a-7d 1st fluid header chamber 7m 1st fluid header chamber for intergroup transfer 8a-8d 2nd fluid header chamber 8m 2nd fluid header chamber for intergroup transfer 15 Internal pipe crossover pipe 16 Outer pipe crossover pipe

Claims (11)

[Claims] 1. An inner tube (2) for heat transfer inside the outer tube (1)
A plurality of double pipes (3) arranged in parallel are arranged in parallel, and in each of the double pipes (3) in this double pipe parallel group (G), the outer pipe (1) and the inner pipe (2) ), The first fluid (A) is circulated in the inter-tube flow path (o), and heat is exchanged with the first fluid (A) in the internal flow path (i) of the inner tube (2). A double-tube heat exchanger that allows a second fluid (B) to flow, wherein one end of the outer tube (1) supports one end of the double-tube parallel group (G). Outer tube plate (4a), one end side inner tube plate (5a) supporting one end of each of the inner tubes (2) protruding from one end of the outer tube (1), and this one end And a lid (6a) on one end side which is arranged on the outer side in the pipe direction with respect to the tube plate (5a) for the inner pipe on the one side, and the tube plate (4a) for the outer pipe on the one end side and the tube plate for the inner pipe ( 5a And a first fluid header chamber (7a) on one end side with respect to each of the inter-tube flow paths (o) in the double pipe parallel group (G), and a tube plate for an inner tube on the one end side. (5a) and the one end side lid (6
a), the second fluid header chamber (8) on one end side with respect to each of the internal flow paths (i) in the double pipe parallel group (G).
a), and at the other end side of the double tube parallel group (G), the outer tube tube plate (4b) at the other end supporting the other ends of the outer tubes (1), and Inner tube tube plate (5b) on the other end side that supports the other end portion of each of the inner tubes (2) protruding from the other end of the tube (1), and inner tube tube plate (5b) on the other end side ) Is provided on the outer side in the tube direction with respect to the other end, and a lid (6b) on the other end side is provided, and between the outer tube tube plate (4b) on the other end side and the inner tube tube plate (5b) on the other end side. A first fluid header chamber (7b) on the other end side with respect to each of the inter-tube flow paths (o) in the double pipe parallel group (G), and the inner pipe tube plate ( 5b) and the other end side lid (6
b), the second fluid header chamber (8) on the other end side with respect to each of the internal flow paths (i) in the double pipe parallel group (G).
Double tube heat exchanger formed b). 2. An inner tube (2) for heat transfer inside the outer tube (1)
A plurality of double pipes (3) arranged in parallel are arranged in parallel, and in each of the double pipes (3) in this double pipe parallel group (G), the outer pipe (1) and the inner pipe (2) ), The first fluid (A) is circulated in the inter-tube flow path (o), and heat is exchanged with the first fluid (A) in the internal flow path (i) of the inner tube (2). A double-tube heat exchanger that allows a second fluid (B) to flow, wherein the first parallel group (G1) and the second parallel group (G2) are parallel to each other as the double-tube parallel group (G). And the outer tube (4a) for supporting one end of each of the outer tubes (1), and the outer tube (4a) on one end side of the first and second parallel groups (G1), (G2). A tube plate (5a) for the inner tube on one end side that supports one end of each of the inner tubes (2) protruding from one end of the tube (1), and a tube plate (5a) for the inner tube on the one end side direction A lid (6a) on the one end side disposed outside is provided, and the first parallel group (G1) is provided between the tube plate (4a) for the outer pipe on the one end side and the tube plate (5a) for the inner pipe on the one end side. ), The first fluid header chamber (7a) on the one end side for the first parallel group with respect to each of the inter-tube flow paths (o), and the second parallel group (G).
2) The first fluid header chamber (7c) for the second parallel group at one end side for each of the inter-tube flow paths (o) in is defined and formed, and the inner tube tube plate (5a) at the one end side is formed. The one end side lid (6
a), a second fluid header chamber (8a) on one end side for the first parallel group for each of the internal flow paths (i) in the first parallel group (G1), and the second parallel group A second fluid header chamber (8c) on one end side for the second parallel group with respect to each of the internal flow paths (i) in the group (G2) is defined and formed, and the first and second parallel groups (G1) , (G2) on the other end side of the outer pipe (1), the outer pipe tube plate (4b) for supporting the other end of each outer pipe (1) and the other end of the outer pipe (1). Another inner pipe tube plate (5b) for supporting the other end portion of each of the inner pipes (2), and an inner pipe tube plate (5b) for the other end side, which is arranged outside in the pipe direction. An end side lid (6b) is provided, and in the first parallel group (G1) between the outer tube tube plate (4b) on the other end side and the inner tube tube plate (5b) on the other end side. The pipe flow path o) a first fluid header chamber for each of the first end side for parallel groups and (7b), the second parallel group (G
2) a first fluid header chamber (7d) on the other end side for the second parallel group with respect to each of the inter-tube flow paths (o) in (2) is partitioned and formed, and a tube plate (5b) for the inner tube on the other end side is formed. ) And the other end side lid (6
b) between the second fluid header chamber (8b) on the other end side for the first parallel group with respect to each of the internal flow paths (i) in the first parallel group (G1), and the second A double tube heat exchanger in which a second fluid header chamber (8d) on the other end side for the second parallel group with respect to each of the internal flow paths (i) in the parallel group (G2) is defined. 3. An inner tube (2) for heat transfer inside the outer tube (1)
A plurality of double pipes (3) arranged in parallel are arranged in parallel, and in each of the double pipes (3) in this double pipe parallel group (G), the outer pipe (1) and the inner pipe (2) ), The first fluid (A) is circulated in the inter-tube flow path (o), and heat is exchanged with the first fluid (A) in the internal flow path (i) of the inner tube (2). A double-tube heat exchanger that allows a second fluid (B) to flow, wherein the first parallel group (G1) and the second parallel group (G2) are parallel to each other as the double-tube parallel group (G). And the outer tube (4a) for supporting one end of each of the outer tubes (1), and the outer tube (4a) on one end side of the first and second parallel groups (G1), (G2). A tube plate (5a) for the inner tube on one end side that supports one end of each of the inner tubes (2) protruding from one end of the tube (1), and a tube plate (5a) for the inner tube on the one end side direction A lid (6a) on the one end side disposed outside is provided, and the first parallel group (G1) is provided between the tube plate (4a) for the outer pipe on the one end side and the tube plate (5a) for the inner pipe on the one end side. ), The first fluid header chamber (7a) on the one end side for the first parallel group with respect to each of the inter-tube flow paths (o), and the second parallel group (G).
2) a first fluid header chamber (7b) for the second parallel group on one end side with respect to each of the inter-tube flow paths (o) in (1) is partitioned and formed, and a tube plate (5a) for the inner tube on the one end side is formed. The one end side lid (6
a), a second fluid header chamber (8a) on one end side for the first parallel group for each of the internal flow paths (i) in the first parallel group (G1), and the second parallel group A second fluid header chamber (8b) on one end side for the second parallel group with respect to each of the internal flow paths (i) in the group (G2) is formed by partitioning, and the first and second parallel groups (G1) are formed. , (G2) on the other end side of the outer pipe (1), the outer pipe tube plate (4b) for supporting the other end of each outer pipe (1) and the other end of the outer pipe (1). Another inner pipe tube plate (5b) for supporting the other end portion of each of the inner pipes (2), and an inner pipe tube plate (5b) for the other end side, which is arranged outside in the pipe direction. An end side lid (6b) is provided, and the first and second parallel groups ((b) are provided between the outer tube tube plate (4b) on the other end side and the inner tube tube plate (5b) on the other end side. G
1), forming a first fluid header chamber (7m) on the other end side for inter-group passage for each of the inter-tube flow paths (o) in (G2), 5b) and the other end side lid (6
b) and the first and second parallel groups (G1), (G
A double pipe heat exchanger having a second fluid header chamber (8 m) on the other end side for inter-group migration for each of the internal flow paths (i) in 2). 4. An inner tube (2) for heat transfer inside the outer tube (1)
A plurality of double pipes (3) arranged in parallel are arranged in parallel, and in each of the double pipes (3) in this double pipe parallel group (G), the outer pipe (1) and the inner pipe (2) ), The first fluid (A) is circulated in the inter-tube flow path (o), and heat is exchanged with the first fluid (A) in the internal flow path (i) of the inner tube (2). A double-tube heat exchanger that allows a second fluid (B) to flow, wherein the first parallel group (G1) and the second parallel group (G2) are parallel to each other as the double-tube parallel group (G). And the outer tube (4a) for supporting one end of each of the outer tubes (1), and the outer tube (4a) on one end side of the first and second parallel groups (G1), (G2). A tube plate (5a) for the inner tube on one end side that supports one end of each of the inner tubes (2) protruding from one end of the tube (1), and a tube plate (5a) for the inner tube on the one end side direction A lid (6a) on the one end side disposed outside is provided, and the first parallel group (G1) is provided between the tube plate (4a) for the outer pipe on the one end side and the tube plate (5a) for the inner pipe on the one end side. ), The first fluid header chamber (7a) on the one end side for the first parallel group with respect to each of the inter-tube flow paths (o), and the second parallel group (G).
2) a first fluid header chamber (7b) for the second parallel group on one end side with respect to each of the inter-tube flow paths (o) in (1) is partitioned and formed, and a tube plate (5a) for the inner tube on the one end side is formed. The one end side lid (6
a) and the first and second parallel groups (G1), (G
2) forming a second fluid header chamber (8m) on one end side for intergroup transfer with respect to each of the internal flow paths (i) in (1) of the first and second parallel groups (G1), (G2). On the other end side, a tube plate (4b) for the outer tube on the other end side that supports the other end portion of each of the outer tubes (1), and the inner tube (4) that protrudes from the other end of the outer tube (1) ( 2) The inner tube tube plate (5b) on the other end side that supports each other end portion, and the other end side lid (5b) arranged on the other end side in the tube direction outside the inner tube tube sheet (5b). 6b) is provided, and the first and second parallel groups (G) are provided between the outer tube tube plate (4b) on the other end side and the inner tube tube plate (5b) on the other end side.
1), forming a first fluid header chamber (7m) on the other end side for inter-group passage for each of the inter-tube flow paths (o) in (G2), 5b) and the other end side lid (6
b), a second fluid header chamber (8a) on the other end side for the first parallel group for each of the internal flow paths (i) in the first parallel group (G1), and the second A double tube heat exchanger in which a second fluid header chamber (8b) on the other end side for the second parallel group with respect to each of the internal flow paths (i) in the parallel group (G2) is defined. 5. An inner tube (2) for heat transfer inside the outer tube (1)
A plurality of double pipes (3) arranged in parallel are arranged in parallel, and in each of the double pipes (3) in this double pipe parallel group (G), the outer pipe (1) and the inner pipe (2) ), The first fluid (A) is circulated in the inter-tube flow path (o), and heat is exchanged with the first fluid (A) in the internal flow path (i) of the inner tube (2). A double-tube heat exchanger that allows a second fluid (B) to flow, wherein the first parallel group (G1) and the second parallel group (G2) are parallel to each other as the double-tube parallel group (G). And the outer tube (4a) for supporting one end of each of the outer tubes (1), and the outer tube (4a) on one end side of the first and second parallel groups (G1), (G2). A tube plate (5a) for the inner tube on one end side that supports one end of each of the inner tubes (2) protruding from one end of the tube (1), and a tube plate (5a) for the inner tube on the one end side direction A lid (6a) on the one end side disposed outside is provided, and the first parallel group (G1) is provided between the tube plate (4a) for the outer pipe on the one end side and the tube plate (5a) for the inner pipe on the one end side. ), The first fluid header chamber (7a) on the one end side for the first parallel group with respect to each of the inter-tube flow paths (o), and the second parallel group (G).
2) a first fluid header chamber (7b) for the second parallel group on one end side with respect to each of the inter-tube flow paths (o) in (1) is partitioned and formed, and a tube plate (5a) for the inner tube on the one end side is formed. The one end side lid (6
a), a second fluid header chamber (8a) on one end side for the first parallel group for each of the internal flow paths (i) in the first parallel group (G1), and the second parallel group A second fluid header chamber (8c) on one end side for the second parallel group with respect to each of the internal flow paths (i) in the group (G2) is defined and formed, and the first and second parallel groups (G1) , (G2) on the other end side of the outer pipe (1), the outer pipe tube plate (4b) for supporting the other end of each outer pipe (1) and the other end of the outer pipe (1). Another inner pipe tube plate (5b) for supporting the other end portion of each of the inner pipes (2), and an inner pipe tube plate (5b) for the other end side, which is arranged outside in the pipe direction. An end side lid (6b) is provided, and the first and second parallel groups ((b) are provided between the outer tube tube plate (4b) on the other end side and the inner tube tube plate (5b) on the other end side. G
1), forming a first fluid header chamber (7m) on the other end side for inter-group passage for each of the inter-tube flow paths (o) in (G2), 5b) and the other end side lid (6
b) between the second fluid header chamber (8b) on the other end side for the first parallel group with respect to each of the internal flow paths (i) in the first parallel group (G1), and the second A double tube heat exchanger in which a second fluid header chamber (8d) on the other end side for the second parallel group with respect to each of the internal flow paths (i) in the parallel group (G2) is defined. 6. An inner tube (2) for heat transfer inside the outer tube (1)
A plurality of double pipes (3) arranged in parallel are arranged in parallel, and in each of the double pipes (3) in this double pipe parallel group (G), the outer pipe (1) and the inner pipe (2) ), The first fluid (A) is circulated in the inter-tube flow path (o), and heat is exchanged with the first fluid (A) in the internal flow path (i) of the inner tube (2). A double-tube heat exchanger that allows a second fluid (B) to flow, wherein the first parallel group (G1) and the second parallel group (G2) are parallel to each other as the double-tube parallel group (G). And the outer tube (4a) for supporting one end of each of the outer tubes (1), and the outer tube (4a) on one end side of the first and second parallel groups (G1), (G2). A tube plate (5a) for the inner tube on one end side that supports one end of each of the inner tubes (2) protruding from one end of the tube (1), and a tube plate (5a) for the inner tube on the one end side direction A lid (6a) on the one end side disposed outside is provided, and the first parallel group (G1) is provided between the tube plate (4a) for the outer pipe on the one end side and the tube plate (5a) for the inner pipe on the one end side. ), The first fluid header chamber (7a) on the one end side for the first parallel group with respect to each of the inter-tube flow paths (o), and the second parallel group (G).
2) a first fluid header chamber (7b) for the second parallel group on one end side with respect to each of the inter-tube flow paths (o) in (1) is partitioned and formed, and a tube plate (5a) for the inner tube on the one end side is formed. The one end side lid (6
a), a second fluid header chamber (8a) on one end side for the first parallel group for each of the internal flow paths (i) in the first parallel group (G1), and the second parallel group A second fluid header chamber (8b) on one end side for the second parallel group with respect to each of the internal flow paths (i) in the group (G2) is formed by partitioning, and the first and second parallel groups (G1) are formed. , (G2) on the other end side, the outer tube tube plate (4b) on the other end side that supports the other end portion of each outer tube (1) and the outer tube tube plate (4b) on the other end side. Is also provided with a lid (6b) on the other end side arranged outside in the tube direction, and the tube plate (4b) for outer pipe on the other end side and the lid (6) on the other end side.
b) and the first and second parallel groups (G1), (G
2) forming a first fluid header chamber (7m) on the other end side for inter-group crossing with respect to each of the inter-pipe flow paths (o) in (2), and forming the first fluid header chamber (7m) on the other end side. Inside, the inner pipe (2) in the first parallel group (G1) and the inner pipe (2) in the second parallel group (G2) are respectively connected to the inner pipe crossover pipe (15). ) Individually connected via a double tube heat exchanger. 7. An inner tube (2) for heat transfer inside the outer tube (1)
A plurality of double pipes (3) arranged in parallel are arranged in parallel, and in each of the double pipes (3) in this double pipe parallel group (G), the outer pipe (1) and the inner pipe (2) ), The first fluid (A) is circulated in the inter-tube flow path (o), and heat is exchanged with the first fluid (A) in the internal flow path (i) of the inner tube (2). A double-tube heat exchanger that allows a second fluid (B) to flow, wherein the first parallel group (G1) and the second parallel group (G2) are parallel to each other as the double-tube parallel group (G). And the outer tube (4a) for supporting one end of each of the outer tubes (1), and the outer tube (4a) on one end side of the first and second parallel groups (G1), (G2). A tube plate (5a) for the inner tube on one end side that supports one end of each of the inner tubes (2) protruding from one end of the tube (1), and a tube plate (5a) for the inner tube on the one end side direction A lid (6a) on the one end side disposed outside is provided, and the first parallel group (G1) is provided between the tube plate (4a) for the outer pipe on the one end side and the tube plate (5a) for the inner pipe on the one end side. ), The first fluid header chamber (7a) on the one end side for the first parallel group with respect to each of the inter-tube flow paths (o), and the second parallel group (G).
2) a first fluid header chamber (7b) for the second parallel group on one end side with respect to each of the inter-tube flow paths (o) in (1) is partitioned and formed, and a tube plate (5a) for the inner tube on the one end side is formed. The one end side lid (6
a), a second fluid header chamber (8a) on one end side for the first parallel group for each of the internal flow paths (i) in the first parallel group (G1), and the second parallel group A second fluid header chamber (8b) on one end side for the second parallel group with respect to each of the internal flow paths (i) in the group (G2) is formed by partitioning, and the first and second parallel groups (G1) are formed. , (G2) on the other end side, each of the outer tubes (1) in the first parallel group (G1),
Each of the outer pipes (1) in the second parallel group (G2) is individually connected via a crossover pipe (16) for outer pipe, and the inner pipe (in the first parallel group (G1) ( With each of 2),
A double-pipe heat exchanger in which each of the inner pipes (2) in the second parallel group (G2) is individually connected via an inner pipe connecting pipe (15). 8. The double tube parallel group (G), (G1),
In the state where (G2) is arranged in a posture in which the pipe direction is horizontal, the evaporation target refrigerant in the refrigeration circuit is circulated as the first fluid (A) in the inter-pipe flow path (o), and the second fluid is used. While the fluid to be endothermic as the fluid (B) is circulated in the internal flow passage (i), the inner pipe (2) is provided downstream of the inter-pipe flow passage (o).
The double-tube heat exchanger according to claim 1, 2, 3, 4, 5, 6, or 7, wherein is eccentric to the lower side of the center of the outer tube (1). 9. On the downstream side of the pipe flow path (o),
The double pipe heat exchanger according to claim 8, wherein the inner pipe (2) is in contact with the bottom of the inner peripheral surface of the outer pipe (1). 10. The double tube parallel group (G), (G1),
In the state where (G2) is arranged in a posture in which the pipe direction is horizontal, as the first fluid (A), a refrigerant to be condensed in a refrigeration circuit is circulated in the inter-pipe passage (o), and The fluid to be radiated as the fluid (B) is circulated in the internal flow passage (i), while the inner pipe (2) is provided downstream of the inter-pipe flow passage (o).
The double-tube heat exchanger according to claim 1, 2, 3, 4, 5, 6, or 7, wherein is eccentric to the center of the outer tube (1). 11. The double pipe type according to claim 10, wherein the inner pipe (2) is in contact with an upper portion of an inner peripheral surface of the outer pipe (1) at a downstream side of the inter-pipe flow passage (o). Heat exchanger.