JPS5812060Y2 - Heat exchanger - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a heat exchanger, and particularly to a heat exchanger in which a plurality of flat tubes are arranged in parallel as heat transfer elements.

Conventionally, there has been a so-called plate-type heat exchanger that can be disassembled and cleaned.

However, this plate type is constructed so that both the hot side and cold side plates are completely disassembled and cleaned, and also uses backing to seal the hot side and cold side, and connects the cold liquid passageway and external conduit. Since a backing made of rubber or the like is used for the joints, there is a drawback that it takes a lot of time and effort to assemble after cleaning.

Furthermore, in the conventional example, the hollow part of the internal structure is too large for the purpose of simply reducing the flow resistance when connecting the low temperature liquid passage and the external conduit. In this case, the low-temperature liquid flows as shown by the dotted line B in FIG. 1, and therefore, there is a problem that heat exchange between the high-temperature fluid A and the low-temperature fluid B does not take place at the corner G.

As a result, the efficiency of heat exchange deteriorates overall, and
There has always been a drawback that durability is poor because internal thermal strain increases due to uneven and repeated heating of the heat exchanger plate.

The object of the present invention is to improve the drawbacks of the prior art, and to provide a heat exchanger equipped with an annular connecting flange that can be easily disassembled and assembled, and that allows fluid to flow approximately uniformly throughout the fluid passage. Our purpose is to provide heat exchangers.

This invention forms a flat tube with two heat exchanger plates,
In a heat exchanger in which a plurality of flat tubes are arranged in parallel as heat transfer elements, each of the electric heating elements is formed with a U-shaped heat transfer plate as a substrate, so that one end and the other end thereof are identical. A separable connecting flange that also serves as a spacer is provided on each overhanging portion, and a common fluid communication hole is provided in the center of each connecting flange. The flange is provided with a radial guide portion that allows fluid to flow out into the entire projecting portion of the electric heating element or to draw fluid from the entire projecting group, and the side corners of this radial guide portion also direct the flowing fluid into the flat tube. A plurality of guide members are arranged at predetermined intervals on the flat tube portion located on the extension line of the overhang portion, and the guide members are guided substantially uniformly over the entire area, thereby achieving the above object. It is.

Embodiments of the present invention will be described below with reference to FIGS. 2 to 14.

FIG. 1 shows a cubic heat exchanger 1 designed for a duct of hot exhaust gas.

A solid arrow A indicates the direction of flow of high-temperature exhaust gas as a high-temperature fluid, and a dotted arrow B indicates a direction of flow of water as a low-temperature liquid (the same applies hereinafter).

The heat exchanger 1 includes a duct-shaped box 2, a heat exchange part 3 housed in the box 2, and a heat exchanger 1 provided upstream and downstream of the low-temperature fluid flowing in the heat exchange part 3. It has connecting flange parts 4 and 5 that form part of the heat exchange part 3 and constitute inflow and outflow parts for low mixed fluid.

The heat exchange section 3 is formed by stacking a plurality of identically formed heat transfer elements 5A, 5B, 6C, . . . .

The heat transfer plates 6A are a pair of heat transfer plates 7A and 7B made of metal thin plates, which are formed substantially the same.
A flat tube is constituted by a flat tube, and an overhanging portion 8A overhanging in the same direction at one end and the other end of the tube,
8B, so that its external plane is formed into a U-shape.

Specifically, heat transfer plates formed in a U-shape) 7A, 7
The entire peripheral end portions of B are bent in the direction of contact with each other, and the bent portions are fixed by seam welding or the like.

As a result, a bag-shaped flat tube (heat transfer tube) 6A having a space 9 of a predetermined width inside is formed.

A through hole is formed in the center of each of the protruding parts 8A and 8B of the heat transfer elm 6A, and substantially disc-shaped flanges 10A and 10B are fixed to the through holes.

The flange IOA has a liquid circulation hole 11 formed in the center, and an annular groove 12 with a V-shaped cross section on one side.
Eight protrusions 13 each having a flat tip are formed at the peripheral end of the other surface, and a hole 14 for inserting a tie rod is formed in each of the protrusions 13 (Figs. 9 to 11). (see figure).

On the other hand, the flange 10B has a liquid circulation hole 15 formed in the center like the flange 10A, and has eight protrusions 16 whose tips are flattened at the peripheral end of one surface.
is formed, and a hole 17 for inserting the tie rod is formed in this protrusion.
is formed, and an annular projection 18 having a V-shaped cross section is formed on the other surface corresponding to the annular groove 12 (see FIGS. 12 to 14).

The other surface of the flange IOA thus formed and one surface of the flange 10B are brought into contact as shown in FIG. 10 or FIG. It is fixed to the projecting parts 8A and 8B by welding or the like.

As a result, flange flow passages 19 communicating with the liquid flow holes 11 are formed radially around the contact portions of the flanges 10A and 10B (see FIGS. 7 and 8).

Therefore, as illustrated by the dotted arrow B in FIG. 7, the low temperature liquid sent from the fluid flow holes 11 is radially ejected from the flange flow passages 19 of the annular flanges 10A and 10B into the heat transfer element 6A. Ru.

As a result, even if the heat transfer element) 6A is used vertically, the flow component B1 of the low-temperature liquid in the corner G direction increases dramatically compared to the conventional one, and therefore the heat transfer element) 6
The heat exchange efficiency within A is significantly improved.

The other heat transfer elements 6B, 6C... are similarly attached to the flange 10A.

Equipped with 10B.

A plurality of fluid guides 20 as guide members are installed at appropriate intervals in the portions where the flow direction of the low temperature fluid changes in the heat transfer elements) 6A, 6B, 6C... (see figure).

This fluid guide 20 more effectively complements the flow of the low-temperature fluid ejected from the flange portion flow passage 19 in the direction of the corner portion G, and is provided with the heat transfer element 6A,
5B, 6C, . . . are set equal to the width in the thickness direction of the space 9, and are fixed.

Therefore, on the one hand, the fluid guide 20 has a function of reinforcing each heat transfer element 6A, 6B, 6C, . . . from the inside.

A plurality of protrusions 21 and 22 are formed on the outer surfaces of the pair of plates 7A and 7B, which are the bases of the heat transfer elm plates 6A, 6B, 6C, . . . .

The protrusions 21 and 22 are formed in advance by press working or the like.

These protrusions 21° and 22 are heat transfer elements) 6A and 6B.
, 6C... are stacked, the tips of the heat transfer elements 6A, 6B, 6C... are in contact with each other, and each heat transfer element 6A, 6B, 6C...
... A number of layers are formed with a predetermined interval 23 between them (see FIG. 3).

The exhaust gas as a high temperature fluid is transferred to this heat transfer element 6A.
, 6B, 6C... with the gap 23 between them serving as a passage.
It flows in the direction shown by the solid line A in the figures or figures 3, and heat can be exchanged with the low mixed liquid flowing through the spaces 9 in the heat transfer elements) 6A, 6B, 6C... .

A pair of plates 7A, 7B forming the bases of the heat transfer elements 6A, 6B, 6C, . . . further have elongated inner protrusions 24, 25 facing inward.

The inner protrusions 24 and 25 are formed in advance by pressing or the like along the flow direction of the low temperature liquid at predetermined intervals.

In this embodiment as well, as illustrated in FIG.
1.22, the arrangement does not necessarily have to be this way.

The tip surfaces of the inner protrusions 24, 25 are in contact with each other and are welded by seam welding or the like in the same manner as the method of joining the peripheral ends of the plates 7A and 7B.

As a result, even if a predetermined water pressure is applied to the heat transfer elements 6A, 6B, 6C..., they can withstand it, and at the same time, the inner protrusions 24.25 are able to withstand the heat transfer elements 6A, 6C... Space 9 inside 6B, 6C...
It has a function of always maintaining the dimension in the thickness direction at a predetermined dimension.

As shown in FIGS. 3 to 6, the welded portions of the peripheral ends of the heat transfer elmmen (6A, 6B, 6C, etc.) protrude outward.

This peripheral end protrusion 26 reduces resistance to the flow of exhaust gas as a high-temperature fluid, and reduces the adhesion of dust at this end.

Furthermore, an air vent mechanism 21 is provided at the upper end of each heat transfer element 6A, 6B, 6C, . . . .

This air venting mechanism 27 is \heat transfer niremen) 6A, 6B,
The air mixed in the low-temperature liquid in 6C is heated and separated from the low-temperature fluid, and collects at the upper end, but when the internal pressure exceeds a predetermined value, it is activated and releases the air to the outside to transfer heat. This is to prevent damage to the Niremen) 6A, 6B, 6C, etc., and further prevent a decrease in heat transfer efficiency due to air stagnation.

This air vent mechanism 27 is composed of a valve, a valve pressing spring, and its mounting member (not shown).

6A heat transfer element constructed as above.

6B, 6C, . . . are laminated so that their 7 langes IOA and IOB portions coincide with each other, and the tie rods 28 are inserted into the tie rod insertion holes 17 and are integrated as a whole to form the heat exchange section 3. There is.

In this case, the stacked flanges 10A, 10B
In the partial seal, for example, as shown in FIG. 8, an annular protrusion 18 formed on the flange 10BK of the heat transfer element 6A is inserted into an annular groove 12 formed on the 7 flange 10A of the heat transfer element 6B. ('C
) The structure is such that the sealing effect is not impaired even when used for heat exchange of high-temperature fluid of high-temperature exhaust gas.

Furthermore, seal nuts are fastened to both ends of the tie rod 28.

This laminated heat transfer elm) 6A, 6B. 6C・
... are housed in the duct-shaped box 2 to maintain their stacked state, and the seven flange portions 10A and 10B form the connecting flange portions 4 and 5 as described above.

A connecting member 29.30 for connecting an external water pipe is fixed to one end of the connecting flange portion 4.5, and a blind lid (not shown) is provided on the inner surface of the other end of the connecting flange portion 4.5. ing.

The heat transfer members 6A, 6B, 6C, etc. are made of metal with good heat transfer efficiency.

That is, the high temperature gas is lOO('C) to 150
In the case of ('C), aluminum is used.
If the high temperature gas power is around 300 ('C), use ordinary stainless steel, or if it exceeds 700 ('C), use 5U.
High-grade stainless steel such as S3108 is used.

Here, although the above embodiment describes heat exchange from gas to liquid, the present invention is not necessarily limited to this, and is also applicable to heat exchange from liquid to liquid.

Furthermore, as for the connecting flange parts 4 and 5, the one divided into two parts is particularly illustrated, but if the low temperature liquid can be discharged radially from the upstream flange part, the connecting flange parts 4, 5,
5 may be integrally processed from the beginning by a manufacturing method such as lost work.

This connecting flange portion 4.degree. 5 does not necessarily have to be annular.

Furthermore, the heat transfer elements) 6A, 6B, 6C...mutual integration is not particularly limited to the fixing method using the tie rods 28, for example, a press rod inside the box body 2 and a screw mechanism that biases this press rod. A tightening mechanism (not shown) formed by a stacked heat transfer element) 6A, 6B is provided.
, 6C... may be housed in the box 2 and then fixed by a tightening mechanism.

In addition, the protrusion 13 of the flange IOA and the flange 10B
The number of protrusions 16 is eight each, but the present invention has eight protrusions 13 and 16 respectively.
The number of protrusions 13, 16 is not necessarily limited to eight, and any number of protrusions 13, 16 may be used as long as they can release the low temperature liquid radially into the heat transfer element.

Furthermore, although the case where the tie rod insertion hole 17 is set outside the annular groove 12 and the annular protrusion 18 has been exemplified, the present invention is not necessarily limited to this. Even if it is set inside the protrusion 18, the effect is the same.

In the heat exchanger according to the present invention, since the heat transfer element is equipped with the connecting flange formed as described above, not only the overall size can be reduced, but also the heat transfer element can be arranged vertically. The fluid can be distributed approximately evenly through the fluid passages in the interior, thereby improving the overall heat exchange efficiency. By simply stacking heat transfer elements, each flow passage for high temperature fluid and low temperature fluid can be separated. It can be completely separated and sealed, thus making it much easier to disassemble and clean the hot fluid path, and after cleaning, it is much easier to assemble, and does not use a conventional rubber backing for sealing. This eliminates the disadvantage of loss of sealing effect even when exposed to high temperatures for long periods of time, thus increasing durability.Furthermore, a common fluid flow hole is provided in the center of the connecting flange provided on each heat transfer element. At the same time, each flange is provided with a radial guide portion that allows fluid to flow out into the entire projecting portion of the electric heating element or to draw in fluid from the entire projecting group, so that the flow from the flange portion to the inside of the heat transfer element is provided. The entire projecting group of the heat transfer element can be effectively used as the effective area of the flow path when flowing out into the heat transfer element, and one of the fluids for heat exchange can smoothly flow into the heat transfer element. A plurality of guide members are arranged at predetermined intervals on the upstream side of the flat tube to guide the liquid flowing out from the corner of the heat transfer element where the radial guide portion is located substantially evenly throughout the entire area of the flat tube. To provide an unprecedented and excellent heat exchanger in which the fluid can be distributed substantially uniformly over the entire area of the heat transfer element because of the individual arrangement, thereby improving the overall efficiency of heat exchange. I can do it.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing the flow of low-temperature fluid in a conventional heat exchanger, Fig. 2 is a perspective view showing an embodiment of the heat exchanger according to the present invention, and Fig. 3 shows the main parts of Fig. 1. 4 is a front view showing a heat transfer element that constitutes the heat exchange section in FIG. 3; FIG. 5 is a right side view of FIG. 4;
Figure 6 is a cross-sectional view taken along line Vl--Vl in Figure 4, Figure 7 is a cross-sectional view taken along line ■-■ in Figure 5, and Figure 8 is a cross-sectional view taken along line ■-■ in Figure 4. 9 is a plan view showing the flange installed on the heat transfer element, and FIG. 10 is a cross-sectional view showing the
- A sectional view taken along the X-ray; Fig. 11 is a rear view of Fig. 9; Fig. 12 is a plan view showing the other seven flanges used as a unit in the flange of Fig. 9; Fig. 13; is III in Figure 12.
14 is a cross-sectional view taken along the line -III, and FIG. 14 is a back view of FIG. 12. 6A, 6B, 6C... Flat tube as a heat transfer element, 7A, 7B... Heat transfer plate, 8A, 8
B... Projection, IOA, IOB... Connection flange, 11... Fluid flow path, 12...
. . . Radial guide portion, 20 . . . Fluid guide as a kite member.

Claims (1)

[Scope of utility model registration request] In a heat exchanger in which a plate-like flat tube is formed by two heat transfer plates, and a plurality of these plate-like flat tubes are arranged in parallel as heat transfer elements, each heat transfer element has a heat transfer plate as its substrate. By forming it into a U-shape, one end and the other end are provided with overhangs that protrude in the same direction, and a separable connecting flange that also serves as a spacer is attached to each overhang. A common fluid circulation hole is provided in the center of each connecting flange, and each flange has a radial guide portion that allows fluid to flow out into the entire overhang of the heat transfer element or to draw in fluid from the entire overhang group. , and a plurality of guide members that guide the fluid flowing into the heat transfer element from the side corners of the radial guide portion substantially evenly throughout the entire area of the heat transfer element are provided in the guide member located on the extension line of the projecting portion. A heat exchanger characterized by a plurality of heat transfer elements arranged at predetermined intervals inside the heat transfer element.