JP2001215095A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve a heat exchanger for improving the machining and assembly properties of a tank part and suppressing the costs of production facilities when developing models by eliminating the folding part of the short side part of a capsule and a sheet metal and using a side cap. SOLUTION: The heat exchanger is provided with a tank 10 consisting of a capsule 1 whose section is in nearly U shape, a sheet metal 2 that is joined to the outer side surface of the capsule 1 and is formed in a cylindrical shape while both the ends are open, and side caps 4a and 4b that are joined so that the opening part at both the sides in cylindrical shape are blocked, and a plurality of tubes 5 that are inserted into a hole 3 that is provided at the sheet metal 2, are supported and fixed by the sheet metal 2, and at the same time are connected into the tank 10. In the heat exchanger, an inclination part 2d is formed on the outer end face of the sheet metal 2 so that it can be joined to the side caps 4a and 4b to form a mating surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger suitable for use as a heater core or the like in a vehicle air conditioner, and more particularly to a tank comprising a capsule, sheet metal and side caps. is there.

[0002]

2. Description of the Related Art Conventionally, as this kind of heat exchanger, there is one disclosed in Japanese Patent Application Laid-Open No. Hei 8-226786. The structure of assembling a capsule and a sheet metal in this publication is shown in FIG. The capsule and the sheet metal are formed from a metal plate such as aluminum.

More specifically, the capsule 100
The sheet metal 110 is formed in a box shape having a substantially U-shaped cross section with one end opened, and these are joined so that the opening side end of the capsule 100 is closed by the sheet metal 110. A tube is inserted into a hole 120 provided in the sheet metal 110, and the tube is supported and fixed to the sheet metal 110 and communicates with the inside of the capsule 100. Then, the expanded metal plate having a shape in which a box having a substantially U-shaped cross section is expanded is bent, and the bent portions are joined to form the capsule 100 and the sheet metal 110.

[0004]

By the way, in the heat exchanger constructed by bending the capsule 100 and the sheet metal 110 into a box shape as described above, it is difficult to develop an assortment of models having different heat transfer areas. In general, there are a method of changing the number of tubes and a method of changing the length of the tubes.

In the former case, a variety of models having different heat transfer areas can be provided by changing the length of the capsule 100 and the sheet metal 110. However, the manufacturing facilities for the capsule 100 and the sheet metal 110 are:
A punching die, an extrusion die, and the like for forming a box shape for each length are required.

For example, a heating heat exchanger for a vehicle requires a heat exchanger of various heating performances corresponding to the heat load in the vehicle compartment from a light vehicle to a large vehicle. The size of a heat exchanger having a heat transfer area is required. When changing the length of the tube and changing the heat transfer area, the capsule 100 and the sheet metal 110 can be commonly used, but when changing the number of tubes to change the heat transfer area, Box-shaped Capsule 1
In the case of the sheet metal 110 and the sheet metal 110, there is a problem that production equipment such as a molding die and a jig needs to be invested for the development of the model, and the production cost increases.

SUMMARY OF THE INVENTION The object of the present invention has been made in view of the above-mentioned problems. By eliminating the bent portion of the short side of the cap and the sheet metal and using a side cap, the workability of the tank is improved. An object of the present invention is to provide a heat exchanger capable of improving assemblability and suppressing the cost of production equipment when developing models.

[0008]

In order to achieve the above object, the technical means according to claims 1 to 9 are adopted.

That is, according to the first aspect of the present invention, the section U
And a sheet metal (2) which has a substantially U-shaped cross section, is joined to the outer side surface (1a) of the capsule (1), and is formed into a cylindrical shape having both ends opened.
A tank (10) is constituted by side caps (4a, 4b) joined so as to close the openings at both ends of the cylindrical shape, and is inserted into a hole (3) provided in the sheet metal (2). While being supported and fixed to the sheet metal (2),
A heat exchanger comprising: a plurality of tubes (5) communicating with a tank (10);
The outer end face of the sheet metal (2) to be joined to the sheet metal (b) and the mating surface is smoothly joined to the outer side face (1a) of the capsule (1).

Therefore, according to the first aspect, the shape of the opening of the side cap (4a, 4b) is such that no gap is formed in the joining surface in order to maintain good brazing properties, and that the smooth curved surface which is easy to mold. Shape is required. As a result, the sheet metal (2) is placed on the outer side surface (1a) of the capsule (1).
By smoothly joining the outer end surfaces of the side caps, the shape of the opening at the joining surface of the side caps (4a, 4b) can be formed in a smooth curved surface shape, so that the formability such as drawing is good. Further, since the joining surfaces of the brazing portions can be engaged without any gap, good brazing properties can be maintained.

Further, by eliminating the bending of the short side of the capsule (1) and the sheet metal (2), it is possible to manufacture a roller from a conventional punching or bending process. According to this forming process, a common jig can cope with the development of an assortment of models based on the length of the capsule (1) and the length of the sheet metal (2).

Moreover, the side caps (4a, 4b) can be used as they are by making the cross-sectional shape of the capsule (1) and the sheet metal (2) the same and changing only the length. Therefore, when many types of heat exchangers are prepared, the manufacturing cost of the production equipment such as a mold and a jig can be reduced as compared with the conventional bending or punching for forming a box shape.

According to the invention of claim 2, the sheet metal (2)
Is characterized in that an inclined portion (2d) is formed on the outer end surface.

According to the second aspect of the present invention, by forming the inclined portion (2d) on the outer end face, the sheet metal (2) is formed.
Steps corresponding to the thickness of the plate (1)
Since it can be formed smoothly toward (a), the shape of the opening at the joint surface of the side caps (4a, 4b) becomes smooth. Therefore, the same effect as the first aspect can be achieved.

In the invention of claim 3, the sheet metal (2) is characterized in that the outer side surface (2a) is formed in a curved shape.

According to the third aspect of the present invention, the inclined portion (2
As in the case of d), since the steps corresponding to the plate thickness of the sheet metal (2) can be sequentially formed smoothly toward the outer side surface (1a) of the capsule (1), the side caps (4a, 4b) can be formed.
The shape of the opening at the joint surface becomes smooth.

According to a fourth aspect of the present invention, the capsule (1)
Is characterized in that the outer side surface (1a) having the step (1d) corresponding to the thickness of the sheet metal (2) is smoothly joined to the outer end surface of the sheet metal (2).

According to the invention of claim 4, the outer end face of the sheet metal (2) and the outer side face (1) of the capsule (1) are provided.
a), the side caps (4a,
The shape of the opening at the joint surface of 4b) becomes smooth.

According to the invention of claim 5, the sheet metal (2)
Is the outer end face and the flange root (1) of the capsule (1).
e) and is smoothly joined.

According to the fifth aspect of the present invention, the outer end face is brought close to the flange base of the capsule (1),
Eliminating the steps makes the shape of the opening at the joint surface of the side caps (4a, 4b) smooth.

According to the sixth aspect of the present invention, the joint surface between the capsule (1) and the sheet metal (2) and the capsule (1)
And the side caps (4a, 4b)
A first projection (1c, 4c) for positioning is provided on one of these two joining surfaces, and a concave portion with which the first projection (1c, 4c) is engaged is provided on the other corresponding joining surface. (1b, 2b) is provided.

According to the sixth aspect of the present invention, the first projections (1c, 4c) for positioning the bonding surface and the recess (1) are positioned.
b, 2b), the two members can be securely held by maintaining the abutting position of the two members in a proper position even in a state where the strength due to high heat is reduced during brazing or the like. be able to.

According to the seventh aspect of the present invention, the side cap (4
a, 4b, 14b) outgoing / inlet piping (8, 9, 8a,
9a) and the side caps (4b, 14b)
A joint surface with the inlet / outlet piping (8, 9, 8a, 9a) is formed on the lid surface side of the side cap (4b, 14b), and the diameter of this joint surface is the diameter of the opening of the side cap (4b, 14b). It is characterized by having a shape that gradually changes from.

According to the seventh aspect of the present invention, the diameter of the side cap (4b, 14b) connecting the inlet / outlet pipes (8, 9, 8a, 9a) is formed so as to gradually change. The sharp reduction does not occur and the water flow resistance can be reduced, and the performance such as temperature distribution and running water noise can be improved.

According to the invention of claim 8, the inlet / outlet piping (8,
9, 8a, 9a) and the side caps (4b, 14b) are provided with positioning second projections (8c, 9c) on one of the two joining surfaces,
A second projection (8c, 9c)
) Is provided with a notch groove (14d) that engages with the notch.

According to the eighth aspect of the present invention, the inlet / outlet pipes (8, 9, 8a, 9a) and the side caps (4b, 14) are provided.
b) and the second projections (8c, 9) for positioning.
c) By the engagement structure of the notch groove (14d) and the notch groove (14d), even when the strength due to high heat is reduced during brazing or the like and the strength is reduced, the abutting position of the two is held at the proper position, Bonding can be performed reliably. In addition, since brazing can be performed integrally including the entrance / exit piping (8, 9, 8a, 9a), the number of assembly steps can be reduced.

According to the ninth aspect of the present invention, the side cap (4
a, 4b, 15a, and 15b), a cover plate (15e) is integrally formed on the joint surface side to be bonded to the capsule (1) and the sheet metal (2), and the cover plate (15e) is a heat exchange unit. (7) It is characterized in that it is configured to prevent wind leakage.

According to the ninth aspect of the present invention, the cover plate (15e) is provided on the side caps (4a, 4b, 15a, 15b).
Is formed integrally, the number of separate components does not increase, the manufacturing cost can be reduced, and the cover plate (15e)
Can prevent wind leakage.

Note that the reference numerals in parentheses of the above means indicate the correspondence with specific means described in the embodiment described later.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) An embodiment of the present invention shown in the drawings will be described below. 1 to 4 show a heater core (heat exchanger) for heating a vehicle air conditioner according to the present invention.
1 shows a first embodiment in which the present invention is applied to the present invention. Reference numeral 1 denotes a capsule formed in a U-shaped cross section, and 2 denotes a sheet metal joined to the capsule 1 so as to face the same, and is formed in a U-shaped cross section. A number of flat tube insertion holes 3 are formed in the sheet metal 2, and the longitudinal direction of the tube insertion holes 3 is parallel to the short side direction of the sheet metal 2.

Reference numeral 5 denotes a flat tube having a flat cross section. Both ends of the flat tube are inserted into the tube insertion holes 3 of the sheet metal 2 and joined. Reference numeral 6 denotes a corrugated fin formed in a corrugated shape, disposed between the flat tubes 5 and joined to the flat tubes 5. Reference numeral 7 denotes end plates provided at both ends of a core portion (heat exchange portion) having the flat tube 5 and the corrugated fins 6, which are inserted into mounting holes (not shown) provided in the sheet metal 2, and It is joined to the metal 2 and the corrugated fin 6.

As shown in FIGS. 2 and 3, reference numeral 4a denotes a side cap, which has a shape of an opening of the side cap 4a so as to close one end of a cylindrical shape formed by joining the capsule 1 and the sheet metal 2. Is adapted to the outer peripheral shape of the cylindrical end, and the inner periphery of the opening of the side cap 4a and the outer periphery of the cylindrical end are engaged and joined.

As shown in FIGS. 4 (a) and 4 (b), reference numeral 4b denotes a joint pipe (side cap) which closes the other end of the cylinder joined to the capsule 1 and the sheet metal 2. , The same shape of the opening as the side cap 4a is formed, and a joint surface of the entrance and exit pipes 8, 9 is formed on the lid surface side.
The diameter of the opening of the side cap 4b is gradually changed from the diameter of the opening to reach the outer diameter of the inlet / outlet pipes 8 and 9 (the pipe joint surface).

The height dimension of the capsule 1 can be reduced by forming the center position of the joint surface between the entrance and exit pipes 8 and 9 toward the core.

Reference numeral 8 denotes an inlet pipe for hot water (engine cooling water), which is inserted into and joined to a joint pipe (side cap) 4b. An outlet pipe 9 for hot water (engine cooling water) is inserted into and joined to a joint pipe (side cap) 4b. Here, in FIG. 1, since the heat exchanger structure is a symmetrical structure, the inlet and outlet of the hot water may be in opposite positions. The capsule 1 and sheet metal 2
The openings at both ends of the cylindrical shape combined with
The tank composed of a and 4b is called a tank 10.

In this embodiment, as shown in FIG. 1, the heater core is constituted as an aluminum heat exchanger integrally joined by brazing, and the corrugated fin 6, the inlet pipe 8, and the outlet pipe 9 are made of brazing material. Aluminum bare material without cladding (A3000
System), but other members (1, 2, 4a, 4
b, 5, 7) are aluminum core materials (A3000)
) Is made of an aluminum clad material in which a brazing material (A4000 type) is clad on both sides.

Next, the main part of the heat exchanger of the present invention will be described. As shown in FIGS. 2 and 3, of the joining surfaces joined by the brazing material, the outside of the flange 1 a of the capsule 1, the inside of the flange 2 a of the sheet metal 2,
The semi-spherical concave portions 1b, 2b and the semi-spherical first projections are formed on the outer peripheral surfaces of both ends formed into a cylindrical shape with the sheet metal 2 and the inner peripheral surface on the opening side of the side caps 4a, 4b. 1c,
4c are formed at corresponding positions. By means of these recesses 1b, 2b and the first projections 1c, 4c, the capsule 1, the sheet metal 2, and the side cap 4 are formed.
a, 4b is maintained, enabling temporary fixing at the time of assembling brazing joints, and detachment of the four members (1, 2, 4a, 4b) after assembling. Can be prevented.

Further, the flange portion 2a of the sheet metal 2
Is formed with an inclined portion 2d on the outer end surface of the. By forming the inclined portion 2d, the side caps 4a, 4b
Can be formed in a smooth curved surface shape. Note that the inclined portion 2d is provided with a side cap 4a,
Only the area to be joined with 4b may be used, and when the tube insertion hole 3 is punched, it is processed by coining or pressing simultaneously with the shapes of the concave portions 1b and 2b.

Here, a method of manufacturing the heat exchanger having the above configuration will be described. First, the temporary assembly of each component is performed by assembling the core with other components (2, 5, 6, 7) except for the capsule 1 and the side caps 4a, 4b.
Specifically, the flat tubes 5 and the corrugated fins 6 are alternately stacked, and end plates 7 are assembled at upper and lower ends of the laminated body. Thereafter, the sheet metal 2 is attached to these assembled bodies at both ends of the flat tubes 5. Attach to

Next, the capsule 1 and the side cap 4
a, 4b and the entrance / exit pipes 8, 9 are assembled to complete the temporary assembly process of the assembly as shown in FIG.

Next, after passing through a step of applying a flux for improving the brazing property with the temporary assembly as it is, it is heated in a heating furnace to a predetermined temperature equal to or higher than the melting point of the brazing material. The step of integrally brazing the entire assembly is completed, and the heat exchanger structure is completed.

In the heat exchanger according to the above-described embodiment, by forming the inclined portion 2d on the outer end surface of the flange portion 2a of the sheet metal 2, the openings of the side caps 4a and 4b are formed to have a smooth curved surface. In addition, the brazing surface can be engaged without gaps, so that the brazing property can be kept good.

Further, by forming the hemispherical concave portions 1b, 2b and the hemispherical first projections 1c, 4c on the joint surface of the capsule 1, the sheet metal 2, and the side caps 4a, 4b, it is ensured that they are formed. Positioning and holding can be performed, and even when the strength due to high heat during brazing or the like is reduced, the contact position between the two can be held at a proper position, and the two can be reliably joined.

Further, by eliminating the bending of the short side of the capsule 1 and the sheet metal 2, it becomes possible to manufacture from stamping and bending to roller forming. According to this forming process, a common jig can cope with the development of an assortment of models based on the length of the capsule 1 and the sheet metal 2. In addition, by making the cross-sectional shapes of the capsule 1 and the sheet metal 2 the same and changing only the length, the side caps 4a, 4a
b can be used in common as it is. Therefore, when many types of heat exchangers are used, the manufacturing cost of production equipment such as a mold and a jig can be reduced as compared with the case of performing a bending process or a punching process for forming a box shape.

Further, in a conventional capsule in which a box-shaped shape is formed by a developed metal plate, as shown in FIG. 11, the entrance pipes 108 and 109 are provided with a substantially elliptical hole on the short side of the capsule 100. One end is an entrance / exit pipe 108, 1
09 is connected to the capsule 100 via a connection pipe 107 whose other end is reduced to a substantially elliptical shape from a substantially round diameter.
Here, the capsule 1 which does not generally contribute to the heat radiation area
The height of the elliptical hole tends to be small because it is desired to reduce the height of 00 as much as possible. As a result, the flow path of the connecting pipe 107 is rapidly reduced (shorted), and the flow rate of hot water is reduced due to an increase in water flow resistance. As a result, there are problems such as deterioration of performance, generation of running water noise when air is mixed, and deterioration of temperature distribution due to bias of running water to the flat tube 5.

Therefore, the joint pipe (side cap) 4b of the present embodiment is formed by gradually changing the diameter of the joint surface of the inlet / outlet pipes 8 and 9 from the diameter of the opening of the side cap 4b by drawing or the like. Pipes 8, 9
By forming the shape to reach the outer diameter (the joint surface of the pipe), the water flow resistance can be reduced, and the performance such as temperature distribution and flowing water noise can be improved.

Further, the joint pipe (side cap) 4b of the present embodiment comprises a capsule 1 and a sheet metal 2
By closing the outer peripheries of both ends of the cylindrical shape, the above-mentioned flow channel can be secured, so that the height of the capsule 1 can be reduced. As a result, the size of the heat exchanger can be reduced.

Further, if the center position of the joining surface of the entrance and exit pipes 8 and 9 is formed so as to be closer to the core, the capsule 1
Height dimension can be reduced. As a result, the size of the heat exchanger can be reduced.

(Second Embodiment) In the first embodiment described above, the inclined portions 2d are formed on the outer end surfaces of the flange portions 2a of the sheet metal 2 so that the shapes of the openings of the side caps 4a and 4b are smooth curved surfaces. Although it has been described that the sheet metal 2 is formed in a shape, the sheet metal 2 is not limited to this, and as shown in FIG.
The outer side surface of the flange portion 2a may be formed to have a smooth curved surface shape toward the end surface. Also in this embodiment, when joined to the capsule 1, the side cap 4 can be formed by forming a curved surface with a smooth outer peripheral shape.
The openings a and 4b can be formed in a smooth curved shape. Thereby, the same effect as in the first embodiment can be obtained.

(Third Embodiment) As shown in FIG. 6, a step 1d may be formed at both ends of the flange 1a of the capsule 1 by the thickness of the sheet metal 2. Also in the present embodiment, when the capsule 1 and the sheet metal 2 are joined, there is almost no step on the surface of the joint portion between the two, and a curved surface shape with a smooth outer peripheral shape as a whole can be formed, so that Cap 4a,
4b can be formed with a smooth curved surface shape. Thereby, the same effect as in the first embodiment can be obtained.

(Fourth Embodiment) Further, as shown in FIG. 7, the height of the flange portion 2a of the sheet metal 2 is increased to the height position of the upper surface portion of the capsule 1, in other words, toward the flange root portion 1e. It may be configured so that the outer end faces are smoothly matched. In the present embodiment, the flange 1a is formed in a cross-sectional shape of the capsule 1 with a bent shape having a minimum curvature, but has a substantially U-shaped cross-section.

(Fifth Embodiment) In the above embodiment, the joint pipe (side cap) 4b joined to the substantially round entrance / exit pipes 8 and 9 has been described. However, the present invention is not limited to this, and the shape is complicated. A joint pipe (side cap) that joins with an entrance / exit connection pipe such as a drawn product may be used. As shown in FIGS. 8 (a), 8 (b) and 8 (c), the hemispherical second protrusion 8 is formed on the joint surface of the inlet / outlet connection pipes 8a and 9a with the joint pipe (side cap) 14b.
c, 9c are formed, and a notch groove 14d is formed on the joint pipe (side cap) 14b side at a position corresponding to the second protrusions 8c, 9c, and the joint pipe (side cap) 14b and the entrance / exit connection pipe are formed. The assembly state with 8a and 9a is maintained, and temporary fixing at the time of assembling brazing joints is enabled. In addition,
The joint pipe (side cap) 14b is a joining surface joined to the outer periphery of both ends of the cylindrical shape where the capsule 1 and the sheet metal 2 are joined, and an inlet / outlet connecting pipe whose diameter is gradually changed from the opening of the joining surface. Since it is formed in a shape reaching the outer diameter of 8a and 9a (connection pipe joint surface), the same effect as in the above-described embodiment can be obtained.

(Sixth Embodiment) In the end plates 7 provided at both ends of the core portion (heat exchange portion) of the above embodiment, the end plates 7 are inserted into mounting holes (not shown) provided in the sheet metal 2. , The sheet metal 2 and the corrugated fin 6. For example, as shown in FIG. 9, projecting portions 7 a are formed at both ends of the end plate 7, and mounting corresponding to the projecting portions 7 a is performed. When brazing (in a heating furnace) is performed with the attachment structure in which the holes 2f are provided in the sheet metal 2, a gap is formed between the end plate end 7b and the sheet metal 2. This gap is formed at four places at four corners, up, down, left and right of the core portion (heat exchange portion).
However, there is a problem that air leakage occurs from this gap.
In particular, the side where the entrance and exit pipes 8 and 9 are installed leaks out of the air conditioning case (not shown).

Therefore, in order to prevent air leakage at this portion, a cover plate is integrally formed on the side caps 15a and 15b. That is, of the joining surfaces joined to the capsule 1 and the sheet metal 2, the bent portion is formed so as to be in close contact with the end plate 7 so as to cover the gap from the long side of the sheet metal 2 toward the core portion (heat exchange portion). 15e is integrally formed. Thus, the gap is covered with the bent portion 15e, and the airtightness prevents air leakage.
In addition, since the components are formed integrally, the number of components does not increase and the manufacturing cost can be reduced.

(Other Embodiments) In the above embodiment, the joint surface between the capsule 1 and the sheet metal 2 and the joint surface between the capsule 1 and the side caps 4a and 4b are:
Although the first protrusions 1c and 4c are provided on the sheet metal 1 and the side caps 4a and 4b, and the concave portions 1b and 2b are provided on the capsule 1 and the sheet metal 2 opposed thereto,
A recess may be provided in the sheet metal 1 and the side caps 4a and 4b, and a first protrusion may be provided in the capsule 1 and the sheet metal 2 opposed thereto.

Further, the present invention is not limited to the heater core for heating, but can be widely applied to a heat exchanger for other uses such as a radiator for a vehicle.

[Brief description of the drawings]

FIG. 1 is a perspective view of a heat exchanger according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view showing the assembly of the capsule, sheet metal, and side cap of FIG. 1;

FIG. 3 is a longitudinal sectional view illustrating a main part of a capsule, a sheet metal, and a side cap according to the first embodiment.

FIG. 4A is an explanatory cross-sectional view showing a main part of a side cap connected to an entrance / exit pipe, and FIG. 4B is a front view showing an overall shape of the side cap.

FIG. 5 is a longitudinal sectional view showing a main part of a capsule, a sheet metal, and a side cap in a second embodiment.

FIG. 6 is a longitudinal sectional view illustrating a main part of a capsule, a sheet metal, and a side cap according to a third embodiment.

FIG. 7 is a longitudinal sectional view showing a main part of a capsule, a sheet metal, and a side cap in a fourth embodiment.

8A is an explanatory cross-sectional view showing a main part of a side cap connected to an entrance / exit connection pipe, FIG. 8B is a perspective view showing the entire shape of the entrance / exit connection pipe, and FIG. FIG. 3 is a perspective view showing the overall shape of the side cap.

FIG. 9 is an exploded perspective view showing an assembly of a capsule, a sheet metal, and a side cap according to a sixth embodiment.

FIG. 10 is an exploded perspective view showing a conventional capsule and sheet metal.

FIG. 11 is an explanatory sectional view showing a capsule connected to a conventional entrance / exit pipe.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Capsule 1a ... Flange part (outer side surface) 1b ... Concave part 1c ... First protrusion part 1d ... Step 1e ... Flange base part 2 ... Sheet metal 2a ... Flange part (outer side surface) 2b ... Concave part 2d ... Inclined part 3 ... Tube insertion hole (hole) 4a ... side cap 4b ... joint pipe (side cap) 4c ... first protrusion 5 ... flat tube (tube) 7 ... end plate (part of heat exchange part) 8 ... inlet pipe (inlet / outlet) 8a ... Inlet connection pipe (inlet / outlet pipe) 8c ... Second protrusion 9 ... Outlet pipe (inlet / outlet pipe) 9a ... Outlet connection pipe (outlet / inlet pipe) 9c ... Second protrusion 10 ... Tank 14b ... Joint pipe ( 14d: Notched groove 15a: Side cap 15b: Joint pipe (side cap) 15e: Bent part (cover plate part)

Claims (9)

[Claims] A capsule (1) having a substantially U-shaped cross section.
A sheet metal (2) having a substantially U-shaped cross-section and joined to the outer side surface (1a) of the capsule (1) to form a cylindrical shape having both ends opened; and an opening at both ends of the cylindrical shape Tank (1) comprising side caps (4a, 4b) joined so as to close the part.
0), a plurality of tubes (5) inserted through holes (3) provided in the sheet metal (2), supported and fixed to the sheet metal (2), and communicating with the inside of the tank (10). And the outer end face of the sheet metal (2), which is joined to the side caps (4a, 4b) to be a mating surface, is smoothly joined to the outer side face (1a) of the capsule (1). Characterized heat exchanger. 2. The heat exchanger according to claim 1, wherein the sheet metal has an inclined portion formed on an outer end surface. 3. The heat exchanger according to claim 1, wherein the sheet metal has an outer side surface formed into a curved shape. 4. The capsule (1) is smoothly joined to an outer side surface (1a) having a step (1d) corresponding to a thickness of the sheet metal (2) and an outer end surface of the sheet metal (2). The heat exchanger according to claim 1, wherein the heat exchanger is used. 5. The heat exchanger according to claim 1, wherein the sheet metal (2) is smoothly joined to an outer end surface and a flange base (1e) of the capsule (1). 6. Positioning at one of the joint surfaces between the capsule (1) and the sheet metal (2) and the joint surface between the capsule (1) and the side caps (4a, 4b). First protrusion (1
c, 4c) are provided, and a concave portion (1b, 2b) engaging with the first protrusion (1c, 4c) is provided on the other corresponding joining surface. The heat exchanger according to any one of claims 1 to 5. 7. The side cap (4a, 4b, 14)
b), the side caps (4b, 14b) joined to the inlet / outlet pipes (8, 9, 8a, 9a) are provided on the lid surface side of the side caps (4b, 14b). 9a), and the diameter of the joint surface is the same as that of the side caps (4b, 14b).
The heat exchanger according to any one of claims 1 to 5, wherein the heat exchanger has a shape gradually changed from the diameter of the opening. 8. The inlet / outlet piping (8, 9, 8a, 9a).
A second projection (8c, 9c) for positioning is provided on one of the two joining surfaces, and the other corresponding joining surface is provided on the other of the joining surfaces between the joining surface and the side cap (4b, 14b). The heat exchanger according to claim 7, characterized in that a notch groove (14d) is provided which engages the second protrusion (8c, 9c). 9. The side cap (4a, 4b, 15)
a, 15b) are cover plates (15e) on the joint surface side to be joined to the capsule (1) and the sheet metal (2).
9. The device according to claim 1, wherein the cover plate (15e) is formed so as to prevent air leakage from the heat exchange unit (7). The heat exchanger as described.