JP2005221152A - Header tank of heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a header tank having a substantially circular section, reduced tank diameter and high pressure withstanding strength at a low cost. <P>SOLUTION: This header tank 11 of an integrated structure includes a top face part 101a in which a refrigerant passage 104 having a substantially U-shaped section is formed; and a base part 101b in which a tube connecting hole 103 and a bead part 102 are formed, wherein some of refrigerant circulated through the refrigerant passage 104 is split and supplied to each tube connecting hole 103. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a header tank for circulating a cooling medium inside a heat exchanger core of a heat exchanger used in, for example, a vehicle.

Conventional heat exchangers using carbon dioxide as a cooling medium have a required pressure strength of about three times that of conventional refrigerants (normal pressure is 10 times). In order to ensure that the cross-sectional shape of the tank portion is a substantially circular multi-hole structure, and the cross-sectional area that receives the internal pressure is reduced to meet the high pressure resistance specification (for example, patent document) 1).
JP-A-10-351784

  Since the header tank of the conventional example is an extruded material, the material cost is higher than that of a general plate material. In addition, since it has a multi-hole structure, there is a support that separates the internal space, and this support becomes an obstacle when a tube is inserted, so it is necessary to form a tube insertion groove in the support. However, since the number of tubes is as large as about several tens (depending on the specification), the number of processing steps for forming the grooves is enormous. As described above, the header tank of the conventional example has a problem that the cost increases due to the effects of processing man-hours, raw materials, and the like.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a header tank with a high pressure resistance and a substantially circular cross section and a reduced tank diameter at a low cost.

  In order to achieve the above object, the invention of claim 1 is a header tank which is formed from a single plate material and has an upper surface portion and a bottom surface portion facing each other, and the upper surface portion extends along the longitudinal direction of the header tank. A refrigerant flow path having a substantially U-shaped cross section is formed, a tube connection hole for connecting a refrigerant tube to the bottom surface part, and a bead part that connects the refrigerant flow path and the tube connection hole are formed, and the refrigerant A part of the refrigerant flowing through the flow path is divided by the bead portion and supplied to the tube connection hole.

  The invention of claim 2 is a header tank formed from a single plate material and having an upper surface portion and a bottom surface portion facing each other, wherein the upper surface portion is a refrigerant having a substantially U-shaped cross section along the longitudinal direction of the header tank. A flow path and a bead part communicating with the refrigerant flow path are formed, a tube connection hole for connecting a refrigerant tube is formed on the bottom surface part, and a part of the refrigerant flowing through the refrigerant flow path is the bead. It is divided into parts and supplied to the tube connection hole.

  According to a third aspect of the present invention, in the first or second aspect, the bead portion has a shape bulging outward from the inside of the tank.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the shape of the bottom surface portion is formed at the center portion, and the plate material formed with the shape obtained by dividing the top surface portion at both side portions is bent, respectively. It has a structure in which the both side portions are joined at the center of the portion to be the upper surface portion.

  According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the plate material is a clad material.

  According to the first aspect of the present invention, even if the tank diameter is reduced with a substantially circular cross section, the refrigerant flow is not hindered, so that the pressure resistance of the header tank can be increased. Moreover, since the header tank can be a press-molded product made of a plate material, the header tank can be manufactured with a cheaper material than when the header tank is manufactured with an extruded material. And since a header tank can be reduced in size, the usage-amount of material can be decreased. Thus, since it can manufacture with a cheap material and can reduce the usage-amount, material cost can be reduced. In addition, the machining cost for forming the pillars separating the internal space inside the tank is not required, so that the machining cost can be reduced. Therefore, it is possible to manufacture a header tank of a heat exchanger having a substantially circular cross section and a small tank diameter and a high pressure resistance, at low cost.

  In particular, in the invention of claim 1, since the bead portion is formed at a position where the tube connection hole and the refrigerant flow path communicate with each other, compared to a configuration in which the tube connection hole and the bead portion are formed on different members and overlapped. Therefore, the labor of alignment can be omitted.

  According to the second aspect of the present invention, it is possible to manufacture a header tank of a heat exchanger having a high pressure resistance and having a substantially circular cross section and a reduced tank diameter as in the first aspect, at a low cost.

  According to the invention of claim 3, since the bead portion has a shape bulging from the inside of the tank to the outside, the strength in the thickness direction of the header tank can be increased.

  According to the invention of claim 4, since the plate material on which the upper surface portion and the bottom surface portion are formed is bent and both side portions are joined at the center of the upper surface portion, the processing shape is left-right symmetrical, The distortion of the material can be reduced.

  According to the invention of claim 5, by using a clad material having a brazing material layer as a surface layer as a material for the header tank, it is not necessary to supply a brazing material from the outside at the time of brazing, and the brazing work man-hour is reduced. The manufacturing cost can be reduced by reducing the manufacturing cost.

  The best mode for carrying out the header tank of the heat exchanger according to the present invention will be described below with reference to the drawings. In each drawing used for explanation, hatching, contour lines, boundary lines, and the like are omitted as appropriate for easy understanding of the structure.

  FIG. 10 is a perspective view illustrating the overall configuration of the heat exchanger according to the first embodiment. The heat exchanger 10 is roughly divided into header tanks 11A and 11B (hereinafter referred to as header tank 11 as appropriate) and a heat exchanger core 12. The heat exchanger core 12 includes a plurality of flat tubes 13 through which a cooling medium (hereinafter referred to as a refrigerant as appropriate) circulates, and fins 14 disposed between the adjacent tubes 13.

  The header tanks 11A and 11B are arranged in parallel so as to be equally spaced from each other along the longitudinal direction. A header tank 11 </ b> A is disposed at one end of the heat exchanger core 12 and communicates with one end of each tube 13. A header tank 11B is disposed at the other end and communicates with the other end of each tube 13. Further, a supply member and a shielding member (not shown) for supplying a cooling medium are joined to the end portions of the header tanks 11A and 11B.

  In the configuration of FIG. 9, the cooling medium supplied to the header tank 11A is distributed from the header tank 11A to the tubes 13 (and the tube holes 13a), flows into the header tank 11B, and is taken out from the header tank 11B. During this time, a heat exchange medium (not shown) such as air circulates between the tubes 13 and the fins 14 of the heat exchanger core 12, so that the cooling medium circulates through the tubes 13 of the heat exchanger core 12. Heat exchange takes place. There are various combinations of cooling medium distribution paths, and the above-described distribution paths are examples of the simplest paths. In each embodiment, a column in which the cooling medium supplied to the header tank 11A flows through the tubes 13 of the heat exchanger core 12 and flows into the header tank 11B will be described.

  Next, the structure of the header tank 11 will be described. FIG. 1 is a partial perspective view of a header tank 11A according to the first embodiment (partially shown in a broken section). Here, the header tank 11A will be described as an example, but the basic configuration of the header tank 11B is the same. Further, illustration of end patches, divides, etc. is omitted.

  As shown in FIG. 1, a header tank body 101, which is a main part of the header tank 11A, is an integrally structured tank made of a single plate material, and has a refrigerant flow path 104, a bead portion 102, and the like to be described later. .

  A central portion of the upper surface portion 101a of the header tank body 101 is formed in a substantially U-shaped cross section, and a refrigerant flow path 104 is formed therein. A portion of the upper surface portion 101 a formed in a substantially U-shaped cross section is joined by a joint portion 105 at the center. On the other hand, a plurality of bead portions 102 having a substantially concave cross-section serving as a cooling medium flow path are formed at equal intervals on the bottom surface portion 101b on the heat exchanger core 12 side, and the bottom surface 102a of each bead portion 102 is formed on the bottom surface 102a. A tube connection hole 103 for connecting the tube 13 is formed. A space communicated by the bead portion 102 is formed between the refrigerant flow path 104 of the upper surface portion 101a and the tube connection hole 103 of the bottom surface portion 101b. The shape of the bead part 102 formed in the bottom face part 101b is shown in FIG. FIG. 2 is a perspective view showing an arrow D in FIG. As shown in FIG. 2, the bead portion 102 has a box frame shape that bulges from the inside of the tank to the outside.

  3A and 3B are partial cross-sectional views of the header tank 11A. FIG. 3A is a cross-sectional view taken along the line AA 'in FIG. 1, and FIG. 3B is a cross-sectional view taken along the line BB' in FIG.

  In the header tank 11A of this embodiment, the internal structure is different between the portion to which the tube 13 is connected and the other portion. That is, only the refrigerant flow path 104 penetrating in the longitudinal direction of the header tank 11A is formed in the portion where the tube 13 is not connected, as shown in FIG. On the other hand, as shown in FIG. 3B, the refrigerant flow path 104 and the bead portion 102 are formed in the portion where the tube 13 is connected, and the bead is formed between the refrigerant flow path 104 and the tube connection hole 103. The portion 102 communicates.

  In the above configuration, the cooling medium supplied from one end of the header tank 11A flows through the refrigerant flow path 104 formed along the longitudinal direction of the tank. And in the part to which the tube 13 is connected, a part of refrigerant | coolant flows from the refrigerant flow path 104 to the bead part 102, flows into the tube connection hole 103, and the tube hole of the tube 13 connected to this tube connection hole 103 It flows into 13a. The cooling medium flowing into the tube hole 13a joins in the header tank 11B (FIG. 9) and is taken out to the outside.

  According to this embodiment, in order to ensure the pressure resistance of the header tank, the cross-sectional shape of the refrigerant flow path is made substantially circular, and the header tank diameter (the width of the substantially U-shaped cross section) is significantly larger than the width of the tube 13. Even when the size is reduced, the cooling medium can surely flow into each tube hole 13a formed in the tube 13, particularly the tube hole 13a located at the end in the width direction. That is, even when the tank diameter is reduced with a substantially circular cross section, it is possible to increase the pressure resistance of the header tank, and at the same time, it is possible to reduce the size and weight of the header tank. .

  In particular, according to the configuration of the present embodiment, the tube connection hole 103 is formed on the bottom surface 102a of the bead portion 102. Therefore, compared with the configuration in which the respective portions are formed on different members and overlapped, the labor of alignment is reduced. Can be omitted.

  Moreover, since the bead part 102 formed in the bottom face part 101b has a shape bulging from the inside of the tank to the outside, the strength in the thickness direction of the tank can be increased.

  Next, a method for manufacturing the header tank 11 will be described. FIGS. 4A to 4D are explanatory views showing a manufacturing procedure of the header tank 21. FIG. FIG. 5 is a cross-sectional view taken along the line CC ′ of FIG.

  First, as shown in FIGS. 4A and 4B, the central portion of the header tank body 101 made of a clad material (aluminum core) flat plate is used as the bottom surface portion 101b, and the bead portion 102 having the same shape is pressed by pressing. In addition, tube connection holes 103 are formed in each bead portion 102. As shown in FIG. 5, the bead portion 102 and the tube connection hole 103 are formed at equal intervals along the longitudinal direction of the tank. Next, as shown in FIG. 4 (c), both sides 101-1 and 101-2 of the header tank body 101 have a shape obtained by dividing the refrigerant flow path 104 (see FIG. 3) having a substantially U-shaped cross section at the center. Bend to make Next, as shown in FIG. 4D, both side portions 101a-1 and 101a-2 of the header tank main body 101 are bent at 90 ° in the direction of the arrow in the figure. Further, as shown in FIG. 4 (e), both side portions 101a-1 and 101a-2 are bent at 90 ° in the direction of the arrow in the drawing, and the end portions are joined together. At this time, both side portions 101 a-1 and 101 a-2 are joined at the center of the portion that becomes the upper surface portion 101 a, and this portion becomes the joined portion 105.

  After this, the heat exchanger core 12 is attached between the header tanks 11A and 11B, and end patches, divides, and the like are attached, and heat is exchanged by heating them in a furnace while being integrated and brazing them together. The vessel 10 is completed.

  According to the present embodiment, since the header tank can be a press-molded product made of a plate material, the header tank can be manufactured with a cheaper material as compared with the case of manufacturing the header tank with an extruded material. Moreover, since the header tank can be reduced in size, the amount of material used can be reduced. Thus, since it can manufacture with a cheap material and can reduce the usage-amount, material cost can be reduced. In addition, the machining cost for forming the pillars separating the internal space inside the tank is not required, so that the machining cost can be reduced. Further, since the bent plate materials are joined at the center of the upper surface portion 101a, the processed shape becomes symmetrical, and the distortion of the material during press working can be reduced.

  In addition, since the clad material having a brazing material layer is used as the material for the header tank, there is no need to supply a brazing material from the outside during brazing, reducing the number of brazing work steps and manufacturing costs. Can be reduced.

  Therefore, according to the present embodiment, it is possible to manufacture a header tank of a heat exchanger having a substantially circular cross section and a high tank pressure with high pressure resistance at low cost.

  Incidentally, in the header tank of Japanese Patent Laid-Open No. 10-351784, which is the background art, it is presumed that the pressure strength can be increased by reducing the tank inner diameter. However, if the header tank diameter is reduced in this conventional example, the refrigerant flow path in the tank is further subdivided, the number of joints increases, and parts that cannot be confirmed from the outside must be brazed. There is a concern about improper attachment. In this regard, with the structure of the present embodiment, since the joint portion can be confirmed from the outside, the occurrence of brazing defects can be suppressed. In particular, in the configuration of the present embodiment, the bent plate material is joined at the center of the upper surface portion 101a, so it is possible to easily determine whether there is a brazing defect. These effects are common in the header tank shown in the second embodiment below.

  Next, the structure of the header tank according to the second embodiment will be described. In addition, since the basic structure of a heat exchanger is the same as Example 1, description is abbreviate | omitted. Further, in the present embodiment, the header tank 21A disposed at the upper part of the heat exchanger core will be described, and the illustration of the header tank 21B (corresponding to 11B in FIG. 9) paired therewith is omitted. Also in this embodiment, the header tanks 21A and 21B are appropriately referred to as the header tank 21. Further, the same or equivalent parts as those in the first embodiment are denoted by the same reference numerals.

  FIG. 6 is a partial perspective view of the header tank 21A according to the second embodiment (partially shown in a broken section).

  As shown in FIG. 6, the header tank main body 201 which is a main part of the header tank 21A is an integral structure tank made of a single plate material, and the refrigerant flow path 204, the bead portion 202 and the like are formed as in the first embodiment. Has been.

  A central portion of the upper surface portion 201a of the header tank main body 201 has a substantially U-shaped cross section, and a refrigerant flow path 204 is formed therein. In addition, a plurality of bead portions 202 serving as cooling medium flow paths are formed on both sides at intervals equal to the arrangement interval of the tubes 13. Furthermore, the part formed in the substantially U-shaped cross section of the upper surface part 201a is joined by the joint part 205 at the center. On the other hand, a plurality of tube connection holes 203 for connecting the tubes 13 are formed at equal intervals on the bottom surface portion 201b on the heat exchanger core 12 side. The space between the refrigerant flow path 204 on the upper surface portion 201a and the tube connection hole 203 on the bottom surface portion 201b is communicated by a bead portion 202 formed on the upper surface portion 201a.

  7A and 7B are partial cross-sectional views of the header tank 21A. FIG. 7A is a cross-sectional view taken along the line AA ′ in FIG. 6, and FIG. 7B is a cross-sectional view taken along the line BB ′ in FIG.

  In the header tank 21A of the present embodiment, the internal structure is different between the portion to which the tube 13 is connected and the other portion. That is, only the refrigerant flow path 204 penetrating in the longitudinal direction of the header tank 21A is formed in the portion where the tube 13 is not connected as shown in FIG. On the other hand, as shown in FIG. 7B, a refrigerant flow path 204 and a bead portion 202 are formed at a portion where the tube 13 is connected, and a bead is formed between the refrigerant flow path 204 and the tube connection hole 203. The portion 202 communicates.

  In the above configuration, the cooling medium supplied from one end of the header tank 21A flows through the refrigerant flow path 204 formed along the longitudinal direction of the tank. And in the part to which the tube 13 is connected, a part of refrigerant | coolant flows from the refrigerant | coolant flow path 204 to the bead part 202, flows into the tube connection hole 203, and the tube hole of the tube 13 connected to this tube connection hole 203 It flows into 13a. The cooling medium that has flowed into the tube hole 13a joins in a header tank 21B (not shown) and is taken out to the outside.

  According to the present embodiment, even when the tank diameter is reduced with a substantially circular cross section as in the first embodiment, cooling is performed on each tube hole 13a formed in the tube 13, particularly the tube hole 13a located at the end in the width direction. The medium can surely flow in. That is, even when the tank diameter is reduced with a substantially circular cross section, it is possible to increase the pressure resistance of the header tank, and at the same time, it is possible to reduce the size and weight of the header tank. .

  In addition, since the bead portions 202 formed on both sides of the upper surface portion 201a have a shape that bulges from the inside of the tank to the outside, the strength in the thickness direction of the tank can be increased.

  Next, a method for manufacturing the header tank 21 will be described. FIGS. 8A to 8D are explanatory views showing a manufacturing procedure of the header tank 21. FIG.

  First, as shown in FIGS. 8A and 8B, the central portion of the header tank body 201 formed of a flat plate of a clad material (aluminum core material) is used as a bottom surface portion 201b at equal intervals along the longitudinal direction of the tank. Tube connection hole 203 is formed. Next, as shown in FIG. 8 (c), bead portions are disposed at both sides 201a-1 and 201a-2 of the header tank main body 201 at intervals equal to the arrangement interval of the tube connection holes 203 along the longitudinal direction of the tank. 102 is formed by press working. Similarly, the both sides 201a-1 and 201a-2 are bent along the longitudinal direction of the tank so that the refrigerant channel 204 (see FIG. 6) having a substantially U-shaped cross section is divided at the center. Next, as shown in FIG. 8 (d), both side portions 201a-1 and 201a-2 of the header tank body 201 are bent at 90 ° in the direction of the arrow in the figure. Further, as shown in FIG. 8 (e), both side portions 201a-1 and 201a-2 are bent at 90 ° in the direction of the arrow in the drawing, and the end portions are joined to each other. At this time, both side portions 201 a-1 and 201 a-2 are joined at the center of the portion that becomes the upper surface portion 201 a, and this portion becomes the joined portion 205.

  After that, the heat exchanger core 12 is attached between the header tanks 21A and 21B, and end patches, divides, and the like are attached, and heat is exchanged by heating them in a furnace while being integrated and brazing and joining them. The vessel 20 is completed.

  Also in this embodiment, since the header tank can be a press-molded product made of a plate material, the header tank can be manufactured with a cheaper material compared to the case of manufacturing the header tank with an extruded material. Moreover, since the header tank can be reduced in size, the amount of material used can be reduced. Thus, since it can manufacture with a cheap material and can reduce the usage-amount, material cost can be reduced. In addition, the machining cost for forming the pillars separating the internal space inside the tank is not required, so that the machining cost can be reduced. Further, since the bent plate materials are joined at the center of the upper surface portion 101a, the processed shape becomes symmetrical, and the distortion of the material during press working can be reduced.

  In addition, since the clad material having a brazing material layer is used as the material for the header tank, there is no need to supply a brazing material from the outside during brazing, reducing the number of brazing work steps and manufacturing costs. Can be reduced.

  Therefore, also in the present embodiment, it is possible to manufacture a header tank of a heat exchanger having a substantially circular cross section and a high tank pressure with a high pressure resistance at a low cost.

  Next, a tube positioning structure connected to the header tank will be described with reference to FIG. FIGS. 9A and 9B are cross-sectional views corresponding to FIG. 7B.

  FIG. 9A is a cross-sectional view showing a shape positioned on the tube side. In this embodiment, notches 206 for positioning are formed on both ends of the tube 13 on the tank insertion side of the tube 13 in the width direction. By bringing the notch 206 of the tube 13 into contact with the edge of the tube connection hole 203, the tube 13 can be inserted into the header tank to a predetermined depth.

  FIG. 9B is a cross-sectional view showing the shape positioned on the header tank side. In the present embodiment, the abutting portions 207 are formed at the positions facing the tube connection holes 203 on both side portions 201a-1 and 201a-2 of the upper surface portion 201a. The abutting portions 207 are formed on both side portions 201a-1 and 201a-2 of the upper surface portion 201a at an interval equal to the arrangement interval of the tubes 13. By bringing the end portion of the tube 13 into contact with the abutting portion 207 of the header tank body 201, the tube 13 can be inserted into the header tank to a predetermined depth.

  In addition, although the positioning structure of the tube connected to a header tank was demonstrated here as an example in Example 2, it cannot be overemphasized that the said positioning structure is applicable also in the structure of Example 1. FIG.

  The arrangement, shape, quantity, material, mounting structure, etc. of each member shown in the above-described first and second embodiments are not limited to the illustrated form, and are appropriately selected and designed according to the specifications of the header tank. Is.

FIG. 3 is a partial perspective view of a header tank according to the first embodiment. The perspective view which shows the arrow D of FIG. FIG. 3 is a partial cross-sectional view of a header tank according to the first embodiment. (A) is the sectional view on the AA 'line of FIG. (B) is the BB 'sectional view taken on the line of FIG. FIG. 3 is an explanatory diagram illustrating a manufacturing procedure of a header tank according to the first embodiment. (A) And (b) is sectional drawing when a bead part and a tube connection hole are formed in a flat plate. (C) is sectional drawing when the shape which divided | segmented the refrigerant | coolant flow path in the center was formed in the both sides of a header tank main body. (D) And (e) is sectional drawing which shows a shape when a header tank main body is bent and edge parts are joined. CC 'sectional view taken on the line of FIG.4 (b). FIG. 10 is a partial perspective view of a header tank according to the second embodiment. FIG. 10 is a partial cross-sectional view of a header tank according to the second embodiment. (A) is the sectional view on the AA 'line of FIG. (B) is the BB 'sectional view taken on the line of FIG. FIG. 6 is an explanatory diagram illustrating a manufacturing procedure of a header tank according to the second embodiment. (A) And (b) is sectional drawing when a tube connection hole is formed in a flat plate. (C) is sectional drawing when the shape which divided | segmented the bead part and the refrigerant | coolant flow path in the center was formed in the both sides of a header tank main body. (D) And (e) is sectional drawing which shows a shape when a header tank main body is bent and edge parts are joined. Explanatory drawing which shows the positioning structure of the tube common to each Example. (A) is sectional drawing which shows the shape which processed the positioning to the tube side. (B) is sectional drawing which shows the shape which carried out positioning processing to the header tank side. 1 is a perspective view showing an overall configuration of a heat exchanger according to Embodiment 1. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10, 20 ... Heat exchanger 11, 21 ... Header tank 12 ... Heat exchanger core 13 ... Tube 13a ... Tube hole 14 ... Fin 101, 201 ... Header tank main body 101 ... Both sides 101a, 201a ... Upper surface 101a-1, 101a-2, 201a-1, 201a-2 ... Both side parts 101b, 201b ... Bottom face part 102, 202 ... Bead part 102a ... Bottom face 103, 203 ... Tube connection hole 104, 204 ... Refrigerant flow path 105, 205 ... Joint part

Claims (5)

A header tank (11) formed from a single plate material and having an upper surface portion (101a) and a bottom surface portion (101b) facing each other,
The upper surface portion (101a) is formed with a substantially U-shaped refrigerant flow path (104) along the longitudinal direction of the header tank,
The bottom surface portion (101b) includes a tube connection hole (103) for connecting the refrigerant tube (13), and a bead portion (102) communicating the refrigerant flow path (104) and the tube connection hole (104). Formed,
The header tank of the heat exchanger (10), wherein a part of the refrigerant flowing through the refrigerant flow path (104) is divided by the bead portion (102) and supplied to the tube connection hole (103). (11). A header tank (21) formed from a single plate material and having an upper surface portion (201a) and a bottom surface portion (201b) facing each other,
The upper surface portion (201a) is formed with a refrigerant channel (204) having a substantially U-shaped cross section along the longitudinal direction of the header tank, and a bead portion (202) communicating with the refrigerant channel (204),
The bottom surface portion (201b) is formed with a tube connection hole (203) for connecting the refrigerant tube (13),
A header tank (21) of a heat exchanger, wherein a part of the refrigerant flowing through the refrigerant flow path (204) is divided by the bead portion (202) and supplied to the tube connection hole (203). .   The header tank (11, 21) of a heat exchanger according to claim 1 or 2, wherein the bead portion (102, 202) has a shape bulging outward from the inside of the tank.   The shape of the bottom surface portion (101b, 201b) is formed in the central portion, and the plate material formed with the shape obtained by dividing the top surface portion (101a, 201a) on each side portion is bent, and the both side portions are formed on the top surface portion (101a). The header tank (11, 21) of the heat exchanger according to any one of claims 1 to 3, wherein the header tank (11, 21) has a structure joined at the center (105, 205). The header plate of a heat exchanger according to any one of claims 1 to 4, wherein the plate material is a clad material.

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