WO2022185817A1

WO2022185817A1 - Heat exchanger

Info

Publication number: WO2022185817A1
Application number: PCT/JP2022/003956
Authority: WO
Inventors: 遼平杉村; 圭祐中村
Original assignee: 株式会社デンソー
Priority date: 2021-03-04
Filing date: 2022-02-02
Publication date: 2022-09-09
Also published as: JP2022134914A

Abstract

A tank of this heat exchange has a plate header (30) and a tank header (20). When a portion of the tank to which an external component is attached is defined as an attachment part (121) and a portion of the tank to which an external component is not attached is defined as an unattached part (122), in the tank attachment part, the distal end of side walls (311, 312) of the plate header and the distal end of side walls (211, 212) of the tank header abut each other and are joined to each other. In the unattached part of the tank, an inner surface of either the plate header or the tank header is joined to an outer surface of the other header.

Description

Heat exchanger

Cross-reference to related applications

This application is based on Japanese Patent Application No. 2021-034403 filed on March 4, 2021, and claims the benefit of its priority. incorporated herein by reference.

The present disclosure relates to heat exchangers.

Conventionally, there is a heat exchanger described in Patent Document 1 below. This heat exchanger comprises a plurality of tubes in which fluid flows, and two tanks connected to both ends of each tube. The tank has a plate header with a substantially U-shaped cross section into which the end of each tube is inserted, and a tank header with a substantially arc-shaped cross section. These members are assembled to form a cylindrical shape. ing. The respective inner surfaces of the side walls of the plate header are joined by brazing to the respective outer surfaces of the side walls of the tank header. A side wall of the plate header is formed with a caulking claw. By crimping the crimping claws of the plate header onto the outer peripheral surface of the tank header, it is possible to braze the plate header and the tank header while maintaining the tank header fixed to the plate header.

Japanese Patent No. 4291644

In the heat exchanger described in Patent Document 1, a stepped portion is formed on the outer peripheral surface of the tank. Specifically, in this heat exchanger, since the inner surface of the side wall of the plate header is joined to the outer surface of the side wall of the tank header, a stepped portion is formed between the side wall of the tank header and the side wall of the plate header. there is Similarly, a stepped portion is also formed between the outer peripheral surface of the plate header and the caulking claw of the plate header.

On the other hand, the heat exchanger may have external parts attached to the outer peripheral surface of the tank. Such external parts include a cap for closing an opening provided at the end of the tank, a connector having an inlet or an outlet, and the like. When such an external component is attached to the outer peripheral surface of the tank, if a stepped portion is formed on the outer peripheral surface of the tank, a gap is formed between the inner peripheral surface of the external component and the stepped portion. A brazing defect may occur in that portion. If a brazing defect occurs, it is not preferable because it causes leakage of fluid in the tank, deterioration of strength and pressure resistance of the tank, deterioration of resistance to thermal distortion of the tank, and the like.

An object of the present disclosure is to provide a heat exchanger in which, even when the external parts are attached to the outer circumference of the tank, defective brazing is less likely to occur at the junction between the external parts and the tank.

A heat exchanger according to one aspect of the present disclosure has a plurality of tubes arranged side by side in a predetermined direction and tanks connected to respective ends of the plurality of tubes, and a first fluid flowing inside the tubes and a second fluid flowing outside the tube. The heat exchanger comprises external components that are attached to the outer circumference of the tank. The tank has a plate header to which respective ends of the plurality of tubes are connected, and a tank header assembled to the plate header to form an internal space of the tank through which the first fluid flows. When the portion of the tank to which the external parts are attached is the mounting portion, and the portion of the tank to which the external parts are not attached is the non-mounting portion, the mounting portion of the tank consists of the tip of the side wall of the plate header and the tank header. and the ends of the side walls of the tank are abutted against each other and joined, and in the non-mounting portion of the tank, the outer surface of one of the plate header and the tank header is joined to the inner surface of the other of the plate header and the tank header. there is

According to this configuration, since the tips of the side walls of the plate header and the tank header are abutted against each other at the mounting portion of the tank and joined together, it is difficult to form a step at the joining portion. As a result, since the gap formed between the joint portion of the plate header and tank header and the external parts can be reduced in the tank mounting portion, there is no brazing failure in the joint portion of the external parts and the tank. less likely to occur.

FIG. 1 is a diagram schematically showing the schematic configuration of the heat exchanger of the first embodiment. FIG. 2 is a perspective view showing the perspective structure around the end of the tank of the first embodiment. FIG. 3 is a front view showing the front structure around the end of the tank of the first embodiment. FIG. 4 is a cross-sectional view showing the cross-sectional structure around the end of the tank of the first embodiment. FIG. 5 is a cross-sectional view showing the cross-sectional structure of the intermediate portion of the tank of the first embodiment. FIG. 6 is a cross-sectional view showing the cross-sectional structure of the end portion of the tank of the first embodiment. FIG. 7 is a cross-sectional view showing the cross-sectional structure of the end of the tank to which the cap of the first embodiment is attached. FIG. 8 is a cross-sectional view showing the cross-sectional structure around the end of the tank in the manufacturing process of the heat exchanger of the first embodiment. FIG. 9 is a cross-sectional view showing the cross-sectional structure around the end of the tank of the first modified example of the first embodiment. FIG. 10 is a cross-sectional view showing the cross-sectional structure of the intermediate portion of the tank of the second modified example of the first embodiment. FIG. 11 is a cross-sectional view showing the cross-sectional structure of the intermediate portion of the tank of the second embodiment. FIG. 12 is a cross-sectional view showing an enlarged cross-sectional structure of the joint portion between the tank header and the plate header of the third embodiment. FIG. 13 is a cross-sectional view showing the cross-sectional structure of the intermediate portion of the tank of another embodiment. FIG. 14 is a cross-sectional view showing the cross-sectional structure of the end of the tank of another embodiment. FIG. 15 is a cross-sectional view showing the cross-sectional structure of the intermediate portion of the tank of another embodiment. FIG. 16 is a cross-sectional view showing the cross-sectional structure of the end of the tank of another embodiment.

An embodiment of a heat exchanger will be described below with reference to the drawings. In order to facilitate understanding of the description, the same constituent elements in each drawing are denoted by the same reference numerals as much as possible, and overlapping descriptions are omitted.
<First Embodiment>
First, the heat exchanger 10 of the first embodiment shown in FIG. 1 will be described. The heat exchanger 10 is used, for example, as a condenser in a heat pump cycle of an air conditioner mounted on a vehicle. In the heat pump cycle, the heat medium circulates in the order of compressor, condenser, expansion valve, and evaporator. A high-temperature and high-pressure gas-phase heat medium compressed by a compressor flows into the heat exchanger 10 . The heat exchanger 10 heats air by exchanging heat between a high-temperature and high-pressure gas phase heat medium flowing inside thereof and air flowing outside thereof. The air conditioner heats the vehicle interior by blowing the heated air into the vehicle interior. In the heat exchanger 10, the high-temperature and high-pressure gas-phase heat medium undergoes heat exchange with air to transition to a high-pressure liquid-phase heat medium. This high pressure liquid phase heat medium flows from the heat exchanger 10 to the expansion valve.

As shown in FIG. 1, the heat exchanger 10 has a core portion 11 and

tanks

12 and 13 . The core portion 11 and the

tanks

12 and 13 are made of a metal material such as aluminum.
The core portion 11 has multiple tubes 110 and multiple fins 111 . The plurality of tubes 110 are arranged side by side with a predetermined gap in the direction indicated by the arrow X. As shown in FIG. The tube 110 is formed to extend in the direction indicated by the arrow Z and has a flattened cross-sectional shape perpendicular to the direction indicated by the arrow Z. As shown in FIG. Inside the tube 110, a flow path through which cooling water flows is formed so as to extend in the direction indicated by the arrow Z. As shown in FIG. Air flows in the direction indicated by arrow Y in the gap formed between

adjacent tubes

110 , 110 .

Hereinafter, the direction indicated by arrow Z will be referred to as "tube longitudinal direction Z", and the direction indicated by arrow Y will be referred to as "air flow direction Y".
Fins 111 are arranged in gaps formed between

adjacent tubes

110 , 110 . The fins 111 increase the contact area with the air flowing through the gap between the

tubes

110 and 110, thereby promoting heat exchange between the heat medium flowing inside the tubes 110 and the air. The fins 111 are so-called corrugated fins formed by bending a thin metal plate into a wave shape.

The

tanks

12 and 13 are connected to both ends of each tube 110 respectively.

Tanks

12 and 13 are formed in a tubular shape so as to extend in the direction indicated by arrow X. As shown in FIG. Below, the direction indicated by the arrow X is called "tank longitudinal direction X". In this embodiment, the tank longitudinal direction X corresponds to the predetermined direction. An inflow port 120 is formed in one of the tanks 12 . An outflow port 130 is formed in the other tank 13 .

In this heat exchanger 10 , the heat medium flows into the tank 12 through the inlet 120 . The heat medium flowing into the tank 12 is distributed inside from one end of each tube 110 of the core portion 11 . In the tube 110, heat is exchanged between the heat medium flowing inside the tube 110 and the air flowing outside the tube 110, whereby the heat medium inside the tube 110 is condensed and the air is heated. The heat medium condensed by exchanging heat with the air flows into the tank 13 from the other end of each tube 110 and is collected, and then flows out from the outlet 130 to the outside. In this embodiment, the heat medium flowing inside the tube 110 corresponds to the first fluid, and the air flowing outside the tube 110 corresponds to the second fluid.

Next, the structure of the

tanks

12 and 13 will be explained in detail. The tank 13 has substantially the same structure as the tank 12 except that it has an outlet 130 . Therefore, below, the structure of the tank 12 will be described as a representative. Since the structures of both ends of the tank 12 are also substantially the same, the structure of one end of the tank 12 will be described below as a representative.

As shown in FIG. 2, the tank 12 has a tank header 20 and a plate header 30. As shown in FIG. In addition, in FIG. 2, the center axis of the tank 12 is indicated by "m10". Below, this center axis m10 is called "tank center axis m10."
The tank header 20 has a substantially U-shaped cross section perpendicular to the tank central axis m10.

Similarly to the tank header 20, the plate header 30 also has a substantially U-shaped cross-sectional shape perpendicular to the tank central axis m10. A plurality of insertion holes 33 are formed in the plate header 30 at predetermined intervals in the longitudinal direction X of the tank. One ends of the plurality of tubes 110 are inserted into the plurality of insertion holes 33 .

By assembling the tank header 20 and the plate header 30 in the longitudinal direction Z of the tube, the cylindrical tank 12 is configured. The internal space of the tank 12 constitutes a channel through which the heat medium flows. As shown in FIGS. 3 and 4, the end portion 121 of the tank 12 is fixed with a cap 14 formed in a substantially bottomed tubular shape around the tank central axis m10. A cap 14 closes the opening at the end of the tank 12 . As shown in FIG. 4 , the inner diameter of the cylindrical portion 140 of the cap 14 positioned on the outer periphery of the tank 12 is reduced from the opening of the tank 12 toward the bottom portion 142 . As a result, the inner peripheral surface 141 of the tubular portion 140 of the cap 14 is tapered. In this embodiment, the cap 14 corresponds to an external component attached to the outer circumference of the tank 12 . Note that illustration of the cap 14 is omitted in FIG.

Below, as shown in FIG. 2, the portion of the tank 12 excluding the end portion 121 to which the cap 14 is attached is referred to as an intermediate portion 122. In this embodiment, the end portion 121 of the tank 12 corresponds to the mounting portion to which the external component is mounted, and the intermediate portion 122 of the tank 12 corresponds to the non-mounting portion to which the external component is not mounted. Also, the tank header 20 corresponds to the first header, and the plate header 30 corresponds to the second header.

As shown in FIG. 2, the tank 12 has different shapes at the end 121 to which the cap 14 is attached and the middle portion 122 .
Next, each structure of the end portion 121 and the intermediate portion 122 of the tank 12 will be described in detail.

2, the left side wall 211 and the right side wall 212 of the tank header 20 located at the end 121 of the tank 12 are hereinafter referred to as the "left side wall end 211" and the "right side wall end 212". called. Similarly, the left side wall 311 and the right side wall 312 of the plate header 30 located at the end 121 of the tank 12 are referred to as the "left side wall end 311" and the "right side wall end 312".

Also, the left side wall 221 and the right side wall 222 of the tank header 20 located in the middle part 122 of the tank 12 are referred to as "left side wall middle part 221" and "right side wall middle part 222". Similarly, the left side wall 321 and the right side wall 322 of the plate header 30 located in the middle part 122 of the tank 12 are called "left side wall middle part 321" and "right side wall middle part 322".

As shown in FIG. 5 , in the intermediate portion 122 of the tank 12 , the intermediate left wall portion 321 of the plate header 30 is arranged to extend along the outer surface of the intermediate left wall portion 221 of the tank header 20 . The inner surface of the intermediate left wall portion 321 of the plate header 30 and the outer surface of the intermediate left wall portion 221 of the tank header 20 are joined together by brazing. With such a structure, a stepped portion 40 is formed at the joint portion between the left side wall intermediate portion 321 of the plate header 30 and the left side wall intermediate portion 221 of the tank header 20 . The right side wall intermediate portion 322 of the plate header 30 and the right side wall intermediate portion 222 of the tank header 20 are also joined by a similar structure.

On the other hand, as shown in FIG. 6, at the end portion 121 of the tank 12, the left side wall end portion 311 of the plate header 30 is provided at a position recessed inwardly from the left side wall intermediate portion 321 thereof. Thus, at the end portion 121 of the tank 12, the left side wall end portion 311 of the plate header 30 is arranged on the extension line of the left side wall end portion 211 of the tank header 20 in the tube longitudinal direction Z. A left side wall end portion 311 of the plate header 30 has a bent portion 313 that is slightly bent outward. The inner surface of the bent portion 313 is in contact with the tip end surface 211 a of the left side wall end portion 211 of the tank header 20 . The upper surface of the bent portion 313 of the left side wall end portion 311 of the plate header 30 and the tip surface 211a of the left side wall end portion 311 of the tank header 20 are joined together by brazing. In this manner, the tip of the left side wall end portion 311 of the plate header 30 and the tip of the left side wall end portion 211 of the tank header 20 are abutted against each other and joined. As a result, almost no step is formed at the joint portion between the left side wall end portion 311 of the plate header 30 and the left side wall end portion 211 of the tank header 20 .

Similarly, a bent portion 314 is formed at the tip of the right side wall end portion 312 of the plate header 30, and the tip of the right side wall end portion 312 of the plate header 30 and the tip of the right side wall end portion 212 of the tank header 20 are bent. They are butted against each other and joined.
As shown in FIG. 7, the cap 14 is brazed and fixed to the outer circumference of the end 121 of the tank 12 thus formed.

Next, a method for manufacturing the tank 12 of this embodiment will be described.
When manufacturing the tank 12, first, a tank header having a cross-sectional shape as shown in FIG. 20 and plate header 30 are molded. In the molded product of this tank header 20, a brazing material is applied to the inner surface and the outer surface thereof. Similarly, the molded product of the plate header 30 is also coated with brazing filler metal on its inner and outer surfaces.

After that, the end of the plate header 30 is processed as shown in FIG. That is, by recessing a portion of the left side wall end portion 311 of the plate header 30 below the tip, a bent portion 313 is formed in the middle of the left side wall 311 . Similarly, the right side wall end 312 of the plate header 30 is also formed with a bent portion 314 .

Next, a portion 315 located above the bent portion 313 at the left side wall end portion 311 of the plate header 30 , more A portion 315 located outside is removed by pressing or cutting. Similarly, a portion 316 of the right side wall end 312 of the plate header 30 located outside the outer surface of the right side wall end 212 of the tank header 20 is removed by pressing or touching. This shapes the end of the plate header 30 as shown in FIG.

After the end portion of the plate header 30 is thus formed, the tank header 20 is assembled to the plate header 30 as shown in FIG. 2, and then the tank 12 is assembled as shown in FIGS. A cap 14 is attached to the end. As a result, the plate header 30 and the tank header 20 are held assembled together as shown in FIG. Specifically, as shown in FIG. 5, in the intermediate portion 122 of the tank 12, the inner surface of the intermediate left wall portion 321 of the plate header 30 is in contact with the outer surface of the intermediate left wall portion 221 of the tank header 20, and The inner surface of the right side wall intermediate portion 322 of the plate header 30 is held in contact with the outer surface of the right side wall intermediate portion 222 of the header 20 . 6, at the end 121 of the tank 12, the tip surface 211a of the left side wall end 211 of the tank header 20 abuts against the upper surface of the bent portion 313 of the left side wall end 311 of the plate header 30. and the top surface of the bent portion 314 of the right side wall end portion 312 of the plate header 30 is held in a state in which the leading end surface 212a of the right side wall end portion 212 of the tank header 20 is abutted.

After that, the assembly of the tank header 20 and the plate header 30 with the cap 14 attached thereto is put into a furnace, and the tank header 20 and the plate header 30 are joined by brazing.
Specifically, in the intermediate portion 122 of the tank 12 shown in FIG. 5, the brazing material is applied to the outer surface of the left side wall intermediate portion 221 of the tank header 20 and the inner surface of the left side wall intermediate portion 321 of the plate header 30, respectively. Therefore, they are joined together by the brazing material. Similarly, the outer surface of the right side wall intermediate portion 222 of the tank header 20 and the inner surface of the right side wall intermediate portion 322 of the plate header 30 are joined together.

On the other hand, in the end portion 121 of the tank 12 shown in FIG. 6, since the brazing material is applied to the upper surface of the bent portion 313 of the left side wall end portion 311 of the plate header 30, they are joined together by the brazing material. . Similarly, the upper surface of the bent portion 314 of the right side wall end portion 312 of the plate header 30 and the tip surface 212a of the right side wall end portion 212 of the tank header 20 are joined to each other.

Through such steps, the manufacture of the tank 12 is completed.
According to the heat exchanger 10 of the present embodiment described above, it is possible to obtain the actions and effects shown in (1) to (5) below.

(1) At the end 121 of the tank 12, the tips of the side wall ends 311, 312 of the plate header 30 and the tips of the side wall ends 211, 212 of the tank header 20 are butted against each other and joined. In the intermediate portion 122 of the tank 12 , the inner surfaces of both side wall

intermediate portions

321 and 322 of the plate header 30 are joined to the outer surfaces of the both side wall

intermediate portions

221 and 222 of the tank header 20 . According to this configuration, as shown in FIG. 7, it is difficult to form a step at joint portions J11 and J12 between the side

wall end portions

311 and 312 of the plate header 30 and the side

wall end portions

211 and 212 of the tank header 20. Become. As a result, at the end portion 121 of the tank 12, the gap formed between the joint portions J11 and J12 of the plate header 30 and the tank header 20 and the cap 14 can be reduced, so that brazing failure does not occur. it gets harder.

(2) As shown in FIG. 6, both side

wall end portions

311 and 312 of the plate header 30 have a height lower than the height of both side wall

intermediate portions

321 and 322 of the plate header 30, and both side wall intermediate portions It is recessed inside the

parts

321 and 322 . According to this configuration, it is possible to easily realize a structure in which the tips of the side wall ends 311 and 312 of the plate header 30 and the tips of the side wall ends 211 and 212 of the tank header 20 abut against each other.

(3) Brazing material is applied to the top surfaces of the

bent portions

313 and 314 where the top ends of the

side wall portions

311 and 312 of the plate header 30 abut against the top portions of the

side wall portions

211 and 212 of the tank header 20 . coated. According to this configuration, the tips of the side wall ends 311 and 312 of the plate header 30 and the tips of the side wall ends 211 and 212 of the tank header 20 can be joined more accurately.

(4) A cap 14 is attached as an external component to the outer periphery of the end portion 121 of the tank 12 . According to this configuration, when joining the tank header 20 and the plate header 30 by brazing, the cap 14 can hold the tank header 20 and the plate header 30 in a mutually assembled state. Therefore, unlike the heat exchanger described in Patent Document 1, it is not necessary to form crimping claws on the plate header 30, so the structure of the plate header 30 can be simplified. Moreover, a separate jig or the like is not required to hold the tank header 20 and the plate header 30 in an assembled state. As a result, the manufacturing process of the heat exchanger 10 can be simplified, and the manufacturing cost can be reduced.

(5) The inner peripheral surface 141 of the cap 14 is tapered. According to this configuration, the end portion 121 of the tank 12 and the inner peripheral surface 141 of the cap 14 can be brought into contact with each other more reliably. Therefore, the gap formed between the joint portions J11, J12 of the side

wall end portions

311, 312 of the plate header 30 and the side

wall end portions

211, 212 of the tank header 20 and the cap 14 can be further reduced. , brazing failure becomes more difficult to occur.

(First modification)
Next, the 1st modification of the heat exchanger 10 of 1st Embodiment is demonstrated.
As shown in FIG. 9 , in the heat exchanger 10 of this modification, the inner surfaces of both side wall ends 311 and 312 of the plate header 30 are joined to the outer surfaces of both side wall ends 211 and 212 of the tank header 20 . . Further, the

tip surfaces

311a and 312a of the side

wall end portions

311 and 312 of the plate header 30 are chamfered.

If the

leading end surfaces

311a and 312a of the side

wall end portions

311 and 312 of the plate header 30 are chamfered in this way, when the cap 14 is attached to the end portion 121 of the tank 12, the plate header 30 and A gap formed between the joint portion of the tank header 20 and the cap 14 can be reduced. Therefore, similarly to the heat exchanger 10 of the first embodiment, brazing defects are less likely to occur.

(Second modification)
Next, the 2nd modification of the heat exchanger 10 of 1st Embodiment is demonstrated.
As shown in FIG. 10 , in the heat exchanger 10 of the present modification, both side wall

intermediate portions

321 and 322 of the plate header 30 also have portions located below the

tip end portions

311 and 312 as well as the side

wall end portions

311 and 312 . is recessed inside. Even with such a configuration, the same or similar actions and effects as those of the heat exchanger 10 of the first embodiment can be obtained.

<Second embodiment>
Next, the heat exchanger 10 of 2nd Embodiment is demonstrated. The following description focuses on differences from the heat exchanger 10 of the first embodiment.
When attempting to assemble the tank header 20 and the plate header 30 during brazing only with the cap 14 without using crimping claws, jigs, etc., as in the heat exchanger 10 of the first embodiment, the cap 14 may be attached. The tank header 20 and the plate header 30 tend to shift in the intermediate portion 122 of the tank 12 that is not installed. In particular, when the tank header 20 is displaced away from the plate header 30 in the tube longitudinal direction Z, the

R portions

223 and 224 of the tank header 20 shown in FIG. There is a possibility that it will be shifted above 322 and exposed to the outside. When such a deviation occurs, the contact area between the side wall

intermediate portions

221 and 222 of the tank header 20 and the side wall

intermediate portions

321 and 322 of the plate header 30 substantially decreases. That is, the brazing area is reduced. This becomes a factor that deteriorates the pressure resistance of the tank 12 .

Therefore, in the heat exchanger 10 of the present embodiment, the intermediate portion 122 of the tank 12 has a structure as shown in FIG. As shown in FIG. 11, the left straight portion 321s and the right straight portion 322s are referred to as the left straight portion 321s and the right straight portion 322s, respectively, in the left side wall intermediate portion 321 and the right side wall intermediate portion 322 of the plate header 30. respectively. Also, the portions of the left side wall intermediate portion 221 and the right side wall intermediate portion 222 of the tank header 20 that extend linearly in the tube longitudinal direction Z are referred to as a left straight portion 221s and a right straight portion 222s.

As shown in FIG. 11, the inner surface of the left straight portion 321s of the plate header 30 is joined to the outer surface of the left straight portion 221s of the tank header 20. As shown in FIG. The left straight portion 321 s of the plate header 30 is longer than the left straight portion 221 s of the tank header 20 . The same applies to the right straight portion 322 s of the plate header 30 and the right straight portion 222 s of the tank header 20 .

According to the heat exchanger 10 of this embodiment described above, it is possible to further obtain the action and effect shown in (6) below.
(6) Even if the tank header 20 is displaced away from the plate header 30 in the tube longitudinal direction Z, the

R portions

223 and 224 of the tank header 20 are not aligned with the

straight portions

321s and 322s of the plate header 30. It becomes easier to maintain the state facing the . As a result, the contact area between the

straight portions

221s, 222s of the tank header 20 and the

straight portions

321s, 322s of the plate header 30 is maintained, so that the reduction of the brazing area can be avoided. Therefore, the pressure resistance of the tank 12 can be ensured.

<Third Embodiment>
Next, the heat exchanger 10 of 3rd Embodiment is demonstrated. The following description focuses on differences from the heat exchanger 10 of the first embodiment.
As shown in FIG. 12 , in the heat exchanger 10 of the present embodiment, a protrusion 321 a is formed on the inner surface of the left side wall intermediate portion 321 of the plate header 30 . The projecting portion 321 a is formed to project toward the outer surface of the left side wall intermediate portion 221 of the tank header 20 . The tip of the projecting portion 321a is in contact with the outer surface of the left side wall intermediate portion 221 of the tank header 20. As shown in FIG. Although not shown, the inner surface of the right side wall intermediate portion 322 of the plate header 30 is similarly formed with a protrusion.

According to the heat exchanger 10 of this embodiment described above, it is possible to further obtain the action and effect shown in (7) below.
(7) By forming the protrusion 321 a on the inner surface of the intermediate left wall portion 321 of the plate header 30 , the protrusion 321 a can be brought into contact with the outer surface of the intermediate left wall portion 221 of the tank header 20 more reliably. As a result, when the left side wall intermediate portion 221 of the tank header 20 and the left side wall intermediate portion 321 of the plate header 30 are joined by brazing, the brazing material tends to flow starting from the protruding portion 321a. can be joined more reliably. The same applies to the right side wall intermediate portion 222 of the tank header 20 and the right side wall intermediate portion 322 of the plate header 30 .

<Other embodiments>
Each of the above embodiments can also be implemented in the following forms.
- In the heat exchanger 10 of 3rd Embodiment, the protrusion part may be formed in the outer surface of the left side wall intermediate part 221 of the tank header 20. FIG.

· As shown in FIG. 13 , in the intermediate portion 122 of the tank 12 , the inner surface of the intermediate left wall portion 221 of the tank header 20 may be joined to the outer surface of the intermediate left wall portion 321 of the plate header 30 . Similarly, the inner surface of the right side wall intermediate portion 222 of the tank header 20 may be joined to the outer surface of the right side wall intermediate portion 322 of the plate header 30 . In this case, a stepped surface 221b may be formed on the left side wall intermediate portion 221 of the tank header 20, and the tip end surface 321b of the left side wall intermediate portion 321 of the plate header 30 may be abutted against the stepped surface 221b. Similarly, after forming a stepped surface 222b on the right side wall intermediate portion 222 of the tank header 20, the tip surface 322b of the right side wall intermediate portion 322 of the plate header 30 may abut against this stepped surface 22b. 14, at the end 121 of the tank 12, the leading end surface 311b of the left side wall end portion 311 of the plate header 30 and the leading end surface 211b of the left side wall end portion 211 of the tank header 20 abut against each other. , and the leading end surface 312b of the right side wall end portion 312 of the plate header 30 and the leading end surface 212b of the right side wall end portion 212 of the tank header 20 may abut against each other.

・External parts attached to the outer periphery of the tank 12 are not limited to the cap 14, for example, a connector having an inlet for allowing the heat medium to flow into the tank 12, A connector or the like having an outlet may be used. Specifically, the connector 50 is attached to the outer peripheral portion of the intermediate portion 122 of the tank 12 as shown in FIG. 15, or the connector 50 is attached to the outer peripheral portion of the end portion 121 of the tank 12 as shown in FIG. You may

· The present disclosure is not limited to the above specific examples. Appropriate design changes made by those skilled in the art to the above specific examples are also included in the scope of the present disclosure as long as they have the features of the present disclosure. Each element included in each specific example described above, and its arrangement, conditions, shape, etc., are not limited to those illustrated and can be changed as appropriate. As long as there is no technical contradiction, the combination of the elements included in the specific examples described above can be changed as appropriate.

Claims

a first fluid having a plurality of tubes (110) arranged side by side in a predetermined direction and tanks (12) connected to respective ends of the plurality of tubes; A heat exchanger (10) for exchanging heat with a second fluid flowing outside the tube,
Equipped with external parts (14, 50) attached to the outer periphery of the tank,
The tank is
a plate header (30) to which respective ends of a plurality of tubes are connected;
a tank header (20) assembled to the plate header to form an internal space of the tank through which the first fluid flows;
When the portion of the tank to which the external component is attached is defined as a mounting portion (121), and the portion of the tank to which the external component is not mounted is defined as a non-mounting portion (122),
In the mounting portion of the tank, the tip of the side wall (311, 312) of the plate header and the tip of the side wall (211, 212) of the tank header are abutted against each other and joined,
A heat exchanger in which an inner surface of the other of the plate header and the tank header is joined to an outer surface of the other of the plate header and the tank header in the non-mounting portion of the tank.
The plate header and the tank header each have a U-shaped cross-sectional shape perpendicular to the longitudinal direction of the tank,
When one of the plate header and the tank header is a first header (20) and the other is a second header (30),
the inner surfaces of the side walls (321, 322) of the non-mounting portions of the second header are joined to the outer surfaces of the side walls (221, 222) of the non-mounting portions of the first header;
The side wall of the mounting portion of the second header has a height lower than the height of the side wall of the non-mounting portion of the second header, and is recessed inwardly from the side wall of the non-mounting portion of the second header. A heat exchanger according to claim 1.
3. The heat exchanger according to claim 2, wherein a brazing material is applied to a portion of the tip of the side wall of the mounting portion of the second header against which the tip of the side wall of the mounting portion of the first header abuts.
The mounting portion of the tank is an end portion of the tank,
4. A heat exchanger according to claim 2 or 3, wherein the external component is a cap (14) attached to the outer circumference of the end of the tank.
The heat exchanger according to claim 4, wherein an inner peripheral surface of the cap that contacts the tank is tapered.
On the outer surface of the straight portions (221s, 222s) extending linearly in the longitudinal direction of the tube on the side wall of the non-attached portion of the first header, the side wall of the non-attached portion of the second header is linearly aligned in the longitudinal direction of the tube. The inner surfaces of the straight portions (321s, 322s) extending in a shape are joined,
6. The length of the straight portion of the side wall of the non-mounting portion of the second header is longer than the length of the straight portion of the side wall of the non-mounting portion of the first header. heat exchanger.
A protrusion (321a) is formed on either the outer surface of the side wall of the non-mounting portion of the first header or the inner surface of the side wall of the non-mounting portion of the second header, protruding toward the other. The heat exchanger according to any one of claims 2 to 6, wherein