JP2016200312A - Heat exchanger and manufacturing method of heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger capable of ensuring a stable connection state between a connector and a header tank even when the connector is connected to the header tank by welding, and capable of ensuring airtightness of the header tank, and a manufacturing method thereof.SOLUTION: Among contact portions 63, 73 with a tank outer shell member 41 in respective connector 6, 7, a portion having a smaller thickness and separated from an outer peripheral edge part 412 of the tank outer shell member 41 connected to an outer edge part 422 of a plate member 42 is connected to the tank outer shell member 41 by welding.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a heat exchanger and a manufacturing method thereof.

  2. Description of the Related Art Conventionally, a heat exchanger is known in which a connector is temporarily fixed to a header tank by inserting and deforming a protruding portion of a connector for pipe connection into a through hole provided in the header tank. (For example, refer to Patent Document 1). In this patent document 1, in the step of temporarily fixing the connector to the header tank, a molding jig is arranged inside the header tank, and the protruding portion of the connector is deformed by the molding jig, whereby the header The connector is temporarily fixed to the tank. Further, in Patent Document 1, as a header tank, a split type header tank is employed in which a tank outer shell portion that forms an outer shell and a plate member that connects tubes are connected by fitting.

JP 2007-205621 A

  However, as disclosed in Patent Document 1, the method of deforming the protruding portion of the connector from the inside of the header tank using the molding jig requires a complicated operation of the molding jig, and the manufacturing man-hour of the heat exchanger is complicated. This is not preferable.

  Therefore, the present inventors are examining temporarily fixing the connector to the header tank by joining the connector to the outer surface of the header tank by welding.

  However, the connector is constructed in the form of a block in consideration of pressure resistance, etc., and is thicker and has a larger heat capacity than the parts constituting the outer surface of the header tank. Tend to be difficult to go up. For this reason, when joining a connector to the outer surface of a header tank by welding, there exists a problem that a joining state is not stabilized because a connector side does not melt | dissolve or a header tank side is damaged.

  Further, in Patent Document 1, a split type header tank in which a header tank is composed of a tank outer shell portion and a plate member is adopted, and a connector is connected in the vicinity of a joint portion between the tank outer shell portion and the plate member. ing.

  In such a configuration, when the connector is temporarily fixed to the header tank by welding, there is a possibility that thermal distortion generated during welding affects the coupling state between the tank outer shell portion and the plate member in the header tank. This is not preferable because it causes a decrease in the airtightness of the header tank.

  In view of the above, the present invention can ensure a stable joint state between the connector and the header tank and ensure the airtightness of the header tank even if the connector is joined to the header tank by welding. It aims at providing a heat exchanger and its manufacturing method.

  The invention according to claim 1 is a laminated body (2) in which a plurality of tubes (21) through which a heat exchange target fluid is circulated, and extends in the laminating direction of the laminated body, and at the longitudinal end of each of the plurality of tubes. A header tank (4) having an internal space communicating with the interior of the plurality of tubes and a pipe (9) through which the heat exchange target fluid flows are connected to the header tank, and the heat exchange target fluid in the pipe A heat exchanger including a flow path (91) and connectors (6, 7) that communicate the internal space of the header tank is intended.

  In order to achieve the above object, the invention according to claim 1 is directed to a header tank comprising a plate member (42) to which the longitudinal ends of each of the plurality of tubes are joined, and a plate member coupled to the plate member. A tank outer shell member (41) having an inner space therebetween and a connector joined to the outer surface is provided, and the tank outer shell member is opposed to the outer edge portion (422) constituting the peripheral edge of the plate member. The connector has an outer peripheral end (412) coupled to the outer edge, and the connector has contact portions (63, 73) that contact the outer surface of the tank outer shell member, and the stacking direction at the contact portion The end side of the tank is joined to the outer surface of the tank outer shell member by welding, and the welding position (632, 634, 732, 734) with the tank outer shell member at the contact portion is the position between the connector and the tank outer shell member. The thickness (Th1) in the facing direction is thinner than the thickest part in the contact part, and the distance (L1) from the outer peripheral end is longer than the part with the shortest distance in the contact part. It is characterized by its position.

  According to this, among the contact parts with the tank outer shell member in the connector, the part with a small thickness is joined to the tank outer shell part by welding, so that it is caused by the difference in the heat capacity between the connector and the tank outer shell part. Then, it is possible to suppress the bonding state between the connector and the tank outer shell from becoming unstable.

  Further, of the contact portion of the connector with the tank outer shell portion, the portion away from the outer peripheral end portion of the tank outer shell portion coupled to the outer edge portion of the plate portion is joined to the tank outer shell portion by welding. Thereby, it can suppress that the thermal distortion etc. which arise when welding a connector to the outer surface of a tank outer shell part influence the joining state of a plate part and a tank outer shell part.

  Therefore, according to the heat exchanger of the present invention, even if the connector is joined to the header tank by welding, it is possible to ensure a stable joined state between the connector and the header tank and to ensure the airtightness of the header tank. Is possible.

  Here, when the connector is joined in the vicinity of the joint portion of the tank outer shell member with the plate member, the tank outer shell member and the plate member are bonded to each other before brazing and joining the tank outer shell member and the plate member due to meat dripping at the time of welding. There is a possibility of joining. In this case, the relative positional relationship between the tank outer shell member and the plate member is determined before brazing and joining, and the gap between the tank outer shell member and the plate member is determined during brazing joining. Is likely to occur.

  Accordingly, an invention according to claim 6 is the method of manufacturing a heat exchanger according to any one of claims 1 to 5, wherein a part of the outer edge portion of the plate member is an outer peripheral end portion of the tank outer shell member. A caulking process for joining the tank shell member and the plate member by bending along the outer periphery of the tank, a welding process for joining the connector to the outer surface of the tank shell member joined to the plate member by welding, and a connector And a brazing step of joining the plate member by brazing.

  In the present invention, the portion of the connector that is in contact with the tank shell member that is separated from the outer peripheral edge of the tank shell member that is coupled to the outer peripheral edge of the plate member is joined to the tank shell member by welding. Yes. According to this, it is possible to prevent the tank outer shell member and the plate member from being joined before brazing and joining of the tank outer shell member and the plate member due to the sagging during welding of the connector and the tank outer shell member. Can do.

  Therefore, according to the present embodiment, when the tank outer shell member and the plate member are joined by brazing, it is possible to suppress the generation of a gap between the tank outer shell member and the plate member. It is possible to ensure sufficient properties.

  In addition, the code | symbol in the parenthesis of each means described in this column and the claim shows an example of a correspondence relationship with the specific means described in the embodiment described later.

It is a whole block diagram of the heat exchanger which concerns on 1st Embodiment. It is a perspective view which shows the header tank vicinity of the heat exchanger which concerns on 1st Embodiment. It is a disassembled perspective view of the header tank of the heat exchanger which concerns on 1st Embodiment. It is a perspective view which shows the header tank of the heat exchanger which concerns on 1st Embodiment. It is VV sectional drawing in FIG. It is typical sectional drawing of the tank outer shell part of the header tank concerning a 1st embodiment. It is VII-VII sectional drawing in FIG. It is typical sectional drawing of the header tank to which the connector which concerns on 1st Embodiment was joined. It is the arrow view seen from the arrow IX direction in FIG. It is a block diagram which shows the manufacturing process of the heat exchanger which concerns on 1st Embodiment. It is typical sectional drawing of the header tank to which the connector which concerns on the modification 1 of 1st Embodiment was joined. It is typical sectional drawing of the header tank to which the connector which concerns on the modification 2 of 1st Embodiment was joined. It is a perspective view which shows the connector which concerns on 2nd Embodiment. It is typical sectional drawing of the header tank to which the connector which concerns on 2nd Embodiment was joined. It is a perspective view which shows the header tank vicinity of the heat exchanger which concerns on 2nd Embodiment.

  Embodiments of the present invention will be described below with reference to the drawings. Note that, in each of the following embodiments, parts that are the same as or equivalent to the matters described in the preceding embodiment are denoted by the same reference numerals, and the description thereof may be omitted. Moreover, in each embodiment, when only a part of the component is described, the component described in the preceding embodiment can be applied to the other part of the component.

(First embodiment)
In the present embodiment, an example in which the heat exchanger of the present invention is applied to a radiator (gas cooler) 1 that performs heat exchange between a refrigerant and air to dissipate the refrigerant in a vehicle air conditioner that performs air conditioning in a vehicle interior will be described. . The heat exchange target fluid of this embodiment is a refrigerant.

  The radiator 1 constitutes a vapor compression refrigeration cycle together with a compressor, a decompression mechanism, and an evaporator (not shown). The refrigeration cycle of the present embodiment is composed of a supercritical refrigeration cycle in which the refrigerant pressure on the high pressure side is equal to or higher than the critical pressure (supercritical state). The refrigeration cycle employs carbon dioxide as a refrigerant. Of course, ethylene, ethane, nitric oxide or the like may be employed as the refrigerant. In addition, the direction of each of the up / down / left / right arrows in FIG.

  As shown in FIG. 1, the radiator 1 of the present embodiment includes a heat exchange core portion 2, a side plate 3, a pair of header tanks 4, a tank cap 5, and a pair of connectors 6 and 7 as main components. .

  Each member constituting the radiator 1 is made of an aluminum metal material such as aluminum or an aluminum alloy. The heat radiator 1 is brazed and joined with a brazing material provided in advance at a necessary portion of each member in a state where the respective members are assembled.

  The heat exchange core part 2 constitutes a heat exchange part that exchanges heat between the refrigerant and the air in the radiator 1. The heat exchange core unit 2 includes a plurality of tubes 21 through which the refrigerant flows, and fins 22 that are arranged between the adjacent tubes 21 to promote heat exchange between the refrigerant and air. In this embodiment, the heat exchange core part 2 comprises the laminated body by which the several tube 21 was laminated | stacked.

  Each tube 21 of the present embodiment is configured by a single-hole or multi-hole tube having a flat cross section. The tubes 21 are arranged at predetermined intervals so that their flat surfaces are arranged in parallel.

  The side plate 3 is a reinforcing member that reinforces the heat exchange core portion 2. The side plates 3 of the present embodiment are arranged on both ends of the heat exchange core portion 2 in the stacking direction of the tubes 21 (up and down direction in FIG. 1).

  The pair of header tanks 4 are connected to both ends in the longitudinal direction of the tube 21 and function as tanks that collect and distribute the refrigerant flowing through the tube 21. Each header tank 4 is composed of a cylindrical hollow member extending along the stacking direction of the tubes 21. Each header tank 4 is formed therein with an internal space communicating with the inside of each tube 21.

  As shown in FIGS. 2 to 7, in this embodiment, a divided type header tank is adopted as the header tank 4. The header tank 4 of this embodiment includes a tank outer shell member 41, a plate member 42, and an intermediate layer material 43.

  The plate member 42 is a member to which the longitudinal ends of the plurality of tubes 21 are joined. The plate member 42 is a member formed by deforming an elongated plate-like aluminum member clad with a brazing material.

  The plate member 42 according to the present embodiment includes a plate-like portion 421 in which a plurality of slit holes 421 a having a shape matching the flat cross section of the tube 21 is formed, and both end portions in the width direction perpendicular to the longitudinal direction at the tank shell member 41. And an outer edge portion 422 configured to be bent toward the intermediate layer material 43 side.

  The slit holes 421a formed in the plate-like portion 421 are provided in the same number as the tubes 21. As shown in FIG. 7, the longitudinal ends of the tubes 21 are joined to the plate member 42 while being inserted into the slit holes 421a.

  The outer edge portion 422 is a portion that faces the outer peripheral end portion 412 formed on the periphery of the tank outer shell member 41 and is coupled to the outer peripheral end portion 412. The outer edge portion 422 has a claw portion 423 for temporarily fixing the tank outer shell member 41, the plate member 42, and the intermediate layer material 43 before joining the tank outer shell member 41 and the plate member 42 by brazing. Is provided.

  Specifically, as shown in FIGS. 3 and 4, the header tank 4 includes a claw portion 423 of the outer edge portion 422 with the intermediate layer material 43 sandwiched between the tank outer shell member 41 and the plate member 42. Is temporarily fixed by bending along the outer periphery of the tank outer shell member 41 and caulking.

  The tank outer shell member 41 is a member that forms an internal space that communicates with the inside of each tube 21 together with the plate member 42. The tank outer shell member 41 is a member formed by deforming an elongated plate-like aluminum member clad with a brazing material. The tank outer shell member 41 has a refrigerant circulation part 411 configured by deforming a central portion in the width direction perpendicular to the longitudinal direction into a U-shaped cross section, and a width from the base side of the refrigerant circulation part 411 toward the plate member 42 side. And an outer peripheral end 412 extending in the direction.

  The refrigerant circulation part 411 is a part that swells on the opposite side of the intermediate layer material 43 and distributes the refrigerant in the longitudinal direction of the header tank 4 in the inner space. In addition, the depth dimension of the refrigerant | coolant circulation part 411 with respect to the outer peripheral edge part 412 of the refrigerant | coolant circulation part 411 is a value more than the width dimension of the refrigerant | coolant circulation part 411. Thus, by reducing the width dimension of the refrigerant circulation part 411, the load due to the pressure of the refrigerant flowing through the internal space of the header tank 4 is concentrated in the direction in which the tank outer shell member 41 and the plate member 42 are about to leave. You can avoid that.

  As shown in FIGS. 4 and 5, the outer peripheral end portion 412 is a portion sandwiched between the claw portion 423 of the outer edge portion 422 and the intermediate layer material 43 in the plate member 42. That is, the outer peripheral end portion 412 has one surface side facing the claw portion 423 of the outer edge portion 422 and the other surface side facing the intermediate layer material 43.

  As shown in FIG. 6, the tank outer shell member 41 of the present embodiment has a sacrificial anticorrosive layer 413 made of a metal that is lower in potential than the material constituting the tank outer shell member 41 on the outer surface side. Yes. In the present embodiment, the sacrificial anticorrosive layer is formed by spraying zinc (Zn spraying) on the outer surface of the tank outer shell member 41 with zinc, which is a metal that is lower in potential than aluminum and aluminum alloy constituting the tank outer shell member 41. 413 is formed. The tank outer shell member 41 has corrosion resistance secured by the sacrificial corrosion action of the sacrificial anticorrosion layer 413.

  Further, as shown in FIG. 2, the tank outer shell member 41 has connectors 6 and 7 for pipe connection joined to its outer surface. The joining form of the tank outer shell member 41 and the connectors 6 and 7 will be described later.

  Subsequently, the intermediate layer material 43 is configured as a component separate from the tank outer shell member 41 and the plate member 42. Specifically, the intermediate layer material 43 is formed of a strip-like aluminum alloy bare material in which a brazing material is not clad. The intermediate layer material 43 has a length in the longitudinal direction equivalent to that of the tank outer shell member 41.

  In the intermediate layer material 43 of the present embodiment, a plurality of through holes 431 penetrating the front and back are formed. Each through hole 431 is formed at a portion corresponding to the slit hole 421 a of the plate member 42. A step portion 431a is formed at a longitudinal end portion of the through hole 431 as a position restricting portion for restricting the tip position of the tube 21 (see FIGS. 5 and 7). Thus, in the configuration in which the tip position of the tube 21 is regulated by the intermediate layer material 43 in which the brazing material is not clad, the tip of the tube 21 is brazed by the brazing material when the header tank 4 and the heat exchange core portion 2 are brazed. It can suppress that the side is obstruct | occluded.

  As shown in FIG. 1, a separator 4 a is disposed inside one of the pair of header tanks 4. The separator 4a is a member that divides the internal space of the header tank 4 into upper and lower portions.

  In addition, a tank cap 5 that closes the upper and lower ends of the header tank 4 is joined to each header tank 4 at the end in the longitudinal direction (the stacking direction of the tubes 21). 2 to 4, the tank cap 5 is not shown for convenience.

  Subsequently, the pair of connectors 6 and 7 are connectors that connect the flow passage 91 in the external pipe 9 through which the refrigerant flows and the internal space of the header tank 4. As shown in FIG. 2, each of the connectors 6 and 7 is joined to the header tank 4 in which the separator 4 a is disposed among the pair of header tanks 4. Each connector 6, 7 constitutes an inlet side connector 6 that introduces the refrigerant into the header tank 4, and the other connector constitutes an outlet side connector 7 that leads out the refrigerant from the header tank 4.

  Here, the connectors 6 and 7 are configured in substantially the same manner. For this reason, in this embodiment, the structure of the inlet side connector 6 is demonstrated and description of the structure about the outlet side connector 7 is abbreviate | omitted. In addition, the code | symbol in the parenthesis in each figure has shown the structure corresponding to the inlet side connector 6 in the outlet side connector 7. FIG.

  As shown in FIGS. 8 and 9, the inlet side connector 6 is configured by a block-shaped aluminum member. The inlet side connector 6 is formed with a communication hole 61 (71) that communicates with the internal space of the header tank 4 through an opening 41a formed on the outer surface of the tank outer shell member 41.

  The inlet side connector 6 of the present embodiment has a connection portion 62 (72) on the side to which the external pipe 9 is connected, and a contact portion 63 (73) that contacts the outer surface of the tank outer shell member 41. The connection part 62 (72) has a larger outer shape than the contact part 63 (73).

  Further, in the present embodiment, a concave portion 631 (731) recessed inward is formed on the end portion side (end surface of the contact portion 63) of the header tank 4 in the contact portion 63 (73) of the inlet side connector 6. Has been. The recess 631 (731) is provided in order to make the thickness Th1 in the facing direction of the tank outer shell member 41 at the contact portion 63 (73) closer to the thickness Th2 of the refrigerant circulation portion 411 of the tank outer shell member 41. . The recessed part 631 (731) of this embodiment is comprised by the bottomed round hole formed by counterboring.

  In the concave portion 631 (731) of the present embodiment, the thickness Th1 of the portion where the concave portion 631 (731) is formed in the contact portion 63 (73) is approximately the same as the thickness Th2 of the refrigerant circulation portion 411 of the tank outer shell member 41. It forms in contact part 63 (73) so that it may become. Specifically, the concave portion 631 (731) of the present embodiment is formed at a position where the distance from the outer surface of the tank outer shell member 41 at the contact portion 63 (73) is about the thickness Th2 of the refrigerant circulation portion 411. ing.

  Moreover, the recessed part 631 (731) of this embodiment is formed in the position near the center part rather than the width direction edge part of the end surface of the contact part 63 (73). Further, the recess 631 (731) has a depth D1 of the bottom surface of the recess 631 (731) so that the pressure resistance of the portion around the communication hole 61 (71) in the inlet connector 6 (7) is sufficiently secured. To the communication hole 61 (71) is formed to be shorter than D2 (D1 <D2).

  The connectors 6 and 7 thus configured are temporarily fixed to the outer peripheral surface of the tank outer shell member 41 by MIG welding (Metal Inert Gas welding), and then brazed to the outer surface of the tank outer shell member 41. It is joined to. Note that “welding” in the present embodiment is a technique (fusion welding) in which a base material is melted and joined, and is different from brazing joining in which brazing material or solder is used so as not to melt the base material.

  As shown in FIG. 2, each connector 6, 7 has an end surface in the longitudinal direction of the header tank 4 (the stacking direction of the tubes 21) at the contact portion 63 (73). It is joined to.

  Here, the detail of the welding position 632 (732) joined by welding with respect to the tank outer shell member 41 in each connector 6 and 7 is demonstrated using FIG. In FIG. 8, the facing direction between the inlet-side connector 6 and the tank outer shell member 41 is the left-right direction on the paper surface, and the direction orthogonal to the facing direction between the inlet-side connector 6 and the tank outer shell member 41 is the vertical direction on the paper surface. ing.

  The welding position 632 (732) is a portion where the thickness Th1 in the contact portion 63 (73) is the largest in the contact portion 63 (73) in the facing direction of the connectors 6 and 7 and the tank outer shell member 41. (Th1 <Thmax).

  The welding position 632 (732) of the present embodiment is a part where the thickness Th1 at the contact part 63 (73) is thinner than the other parts at the contact part 63 (73). Specifically, the welding position 632 (732) is located between the recess 631 (731) and the tank outer shell member 41 and close to the tank outer shell member 41.

  Further, the welding position 632 (732) is the distance L1 from the outer peripheral end 412 in the direction orthogonal to the opposing direction of the connectors 6 and 7 and the tank outer shell member 41, and is the most in the contact part 63 (73). It is a position where the distance from the outer peripheral end portion 412 is longer than that of the portion having a short distance (L1> Lmin).

  The welding position 632 (732) of the present embodiment is a part where the distance L1 from the outer peripheral end 412 of the tank outer shell member 41 is longer than other parts in the contact part 63 (73). Specifically, the welding position 632 (732) is a position close to the central portion of the refrigerant circulation portion 411 in the tank outer shell member 41.

  Next, an outline of a method for manufacturing the radiator 1 in the present embodiment will be described with reference to FIG. FIG. 10 shows a schematic manufacturing procedure of the radiator 1. As shown in FIG. 10, the radiator 1 of the present embodiment is divided into a heat exchange core portion 2 side and a header tank 4 side in the first half of the manufacturing procedure. For this reason, the first half of the manufacturing procedure will be described individually.

  On the header tank 4 side, a tank outer shell member 41, a plate member 42, an intermediate layer material 43, and a tank cap 5 which are first formed into a desired shape by press molding or the like and clad with a brazing material at a necessary location. The connectors 6 and 7 are prepared (preparation process). The preparation step includes a step of forming the sacrificial anticorrosion layer 413 on the outer surface of the tank outer shell member 41 by Zn spraying.

  Subsequently, with the intermediate layer material 43 sandwiched between the tank outer shell member 41 and the plate member 42, the claw portion 423 of the outer edge portion 422 is bent along the outer periphery of the tank outer shell member 41 and caulked. The members 41 to 43 constituting the header tank 4 are coupled (caulking process). In this caulking step, after the members 41 to 43 constituting the header tank 4 are coupled, the tank cap 5 is coupled to both ends of the header tank 4 in the longitudinal direction.

  Subsequently, the connectors 6 and 7 are joined to the outer surface of the tank outer shell member 41 coupled to the plate member 42 by MIG welding (connector welding process). In this welding process, the connectors 6 and 7 are joined to the outer surface of the tank outer shell member 41 at the aforementioned welding position.

  On the other hand, on the heat exchange core portion 2 side, first, a tube 21, a fin 22 and a side plate 3 which are formed into a desired shape by press molding or the like and clad with a brazing material at a necessary place are prepared (preparation step). ). The fins 22 are arranged between the tubes 21, and the tubes 21, the fins 22, and the side plates 3 are assembled with a jig such as a wire in a state where the side plates 3 are arranged at the ends of the tubes 21 in the stacking direction. Apply (temporary assembly process of heat exchange core part).

  Subsequently, the header tank 4 to which the connectors 6 and 7 are joined and the heat exchange core part 2 to which the side plate 3 is assembled are assembled (an assembly process of the header tank and the heat exchange core part). In this step, both longitudinal ends of each tube 21 of the heat exchange core portion 2 are inserted into the slit holes 421a of the plate member 42 of the header tank 4 and the through holes 431 of the intermediate layer material 43.

  Subsequently, the assembled body in which the header tank 4 and the heat exchange core part 2 are assembled is heated in a furnace to braze and join the header tank 4 and the heat exchange core part 2 so as to be integrated. (Brazing process). Finally, if there is a jig used when the header tank 4 and the heat exchange core part 2 are assembled, the jig is removed.

  According to the heat radiator 1 of the present embodiment described above, of the contact parts 63 and 73 of the connectors 6 and 7 with the tank outer shell member 41, the parts having a small thickness are joined to the tank outer shell member 41 by welding. doing. For this reason, it can suppress that the joining state of each connector 6 and 7 and the tank outer shell member 41 resulting from the difference in the heat capacity of each connector 6 and 7 and the tank outer shell member 41 becomes unstable.

  Further, of the contact portions 63 and 73 of the connectors 6 and 7 with the tank outer shell member 41, the portions away from the outer peripheral end portion 412 of the tank outer shell member 41 coupled to the outer edge portion 422 of the plate member 42. The tank outer shell member 41 is joined by welding. Thereby, it can suppress that the thermal distortion etc. which arise when welding each connector 6 and 7 to the outer surface of the tank outer shell member 41 affect the joining state of the plate member 42 and the tank outer shell member 41. .

  Therefore, according to the heat radiator 1 of this embodiment, even if each connector 6 and 7 is joined with respect to the header tank 4 by welding, the stable joining state of each connector 6 and 7 and the header tank 4 is ensured. At the same time, the airtightness of the header tank 4 can be ensured.

  As described above, the configuration capable of sufficiently ensuring the airtightness of the header tank 4 is particularly suitable for a supercritical refrigeration cycle in which the pressure of the refrigerant flowing into the radiator 1 is high (specifically, 7 MPa or more). Is preferred.

  Further, as in the present embodiment, the recesses 631 and 731 are formed on the end sides in the stacking direction of the connectors 6 and 7, and the positions where the thickness is reduced by the recesses 631 and 731 are the welding positions 632 and 732, respectively. According to this, the difference in the heat capacity between the connectors 6 and 7 and the tank outer shell member 41 can be reduced by a simple process such as a spot facing process.

  Here, the corrosion resistance of the header tank 4 can be improved by forming the sacrificial anticorrosion layer 413 on the surface side of the tank outer shell member 41 as in the present embodiment.

  However, when the connectors 6 and 7 are joined to the outer surface of the tank outer shell member 41 by welding, the corrosion resistance effect by the sacrificial anticorrosive layer 413 may be reduced by the dissolution of the base material of each member during welding. Concerned.

  On the other hand, in this embodiment, among the contact parts 63 and 73 of the connectors 6 and 7 with the tank outer shell member 41, the parts having a small thickness are joined to the tank outer shell member 41 by welding. According to this, since the weld bead formed at the time of welding can be made small, the influence on the sacrificial anticorrosion layer 413 in the tank outer shell member 41 accompanying welding can be reduced. As a result, the sacrificial anticorrosion layer 413 can suppress corrosion at the interface between the connectors 6 and 7 and the tank outer shell member 41.

  Further, when the connectors 6 and 7 are joined in the vicinity of the joint portion of the tank outer shell member 41 with the plate member 42, the tank outer shell member 41 and the plate member 42 are joined to the outside of the tank by brazing during welding. There is a possibility that the shell member 41 is joined to the plate member 42. In this case, since the relative positional relationship between the tank outer shell member 41 and the plate member 42 is determined before brazing and joining, the tank outer shell member 41 and the plate member 42 are joined when brazed. A gap is likely to occur between them.

  On the other hand, in this embodiment, the outer periphery of the tank outer shell member 41 coupled to the outer edge portion 422 of the plate member 42 among the contact portions 63 and 73 of the connectors 6 and 7 with the tank outer shell member 41. The part away from the end 412 is joined to the tank outer shell member 41 by welding. According to this, the tank outer shell member 41 and the plate member 42 are bonded to each other before the brazing joint between the tank outer shell member 41 and the plate member 42 by the sagging during welding of the connectors 6 and 7 and the tank outer shell member 41. Can be prevented from being joined.

  Therefore, according to the present embodiment, when the tank outer shell member 41 and the plate member 42 are brazed and joined, it is possible to suppress a gap from being generated between the tank outer shell member 41 and the plate member 42. It becomes possible to ensure sufficient airtightness of the header tank 4.

  Here, in the present embodiment, an example in which the concave portions 631 and 731 formed in the connectors 6 and 7 are configured by bottomed round holes has been described, but the concave portions 631 and 731 of the present embodiment are configured in the following manner. It is also possible.

(Modification 1 of the first embodiment)
As shown in FIG. 11, a bottomed elliptical hole extending in a direction orthogonal to the opposing direction of each connector 6, 7 and the header tank 4 is formed in the contact portion 63 (73) of each connector 6, 7. And you may make it comprise the recessed part 631A (731A) by the said elliptical hole.

(Modification 2 of the first embodiment)
As shown in FIG. 12, a groove extending in a direction orthogonal to the opposing direction of each connector 6, 7 and the header tank 4 is formed in the contact portion 63 (73) of each connector 6, 7, Thus, the concave portion 631B (731B) may be formed.

(Second Embodiment)
Next, a second embodiment will be described. In the present embodiment, description of the same or equivalent parts as in the first embodiment will be omitted or simplified.

  In this embodiment, as shown in FIG. 13 to FIG. 15, a protrusion 633 (projecting in the longitudinal direction of the header tank 4 (the stacking direction of the tubes 21)) at the contact portion 63 (73) of each connector 6, 7. 733).

  The protruding portion 633 (733) is formed so as to protrude from the end portion side in the longitudinal direction of the header tank 4 (end surface of the contact portion 63) in the contact portion 63 (73) of the inlet side connector 6. The protrusion 633 (733) is provided in order to make the thickness Th1 in the facing direction of the tank outer shell member 41 at the contact portion 63 (73) closer to the thickness Th2 of the refrigerant circulation portion 411 of the tank outer shell member 41. Yes.

  In the protrusion 633 (733) of the present embodiment, the thickness Th1 of the portion where the protrusion 633 (733) is formed in the contact portion 63 (73) is equal to the thickness Th2 of the refrigerant circulation portion 411. Is formed. Further, the protrusion 633 (733) of the present embodiment is formed at a position closer to the center than the end in the width direction of the end face of the contact portion 63 (73). In the present embodiment, the protrusion 633 (733) is a part where the thickness Th1 at the contact part 63 (73) is thinner than other parts at the contact part 63 (73).

  The detail of the welding position 634 (734) of this embodiment is demonstrated using FIG. In the present embodiment, the end of the protrusion 633 (733) in the longitudinal direction of the header tank 4 (the stacking direction of the tubes 21) is the welding position 634 (734).

  In addition, the welding position 634 (734) has a distance L1 from the outer peripheral end 412 that is the most in the contact portion 63 (73) in the direction orthogonal to the opposing direction of the connectors 6 and 7 and the tank outer shell member 41. It is a position where the distance from the outer peripheral end portion 412 is longer than that of the portion having a short distance (L1> Lmin). Specifically, the welding position 634 (734) is a position close to the central portion of the refrigerant circulation portion 411 in the tank outer shell member 41.

  Other configurations are the same as those of the first embodiment. According to the configuration of the present embodiment, among the contact portions 63 and 73 of the connectors 6 and 7 with the tank outer shell member 41, the portions having a small thickness are joined to the tank outer shell member 41 by welding. Further, of the contact portions 63 and 73 of the connectors 6 and 7 with the tank outer shell member 41, the portions away from the outer peripheral end portion 412 of the tank outer shell member 41 coupled to the outer edge portion 422 of the plate member 42. The tank outer shell member 41 is joined by welding.

  Therefore, even if the radiator 1 of this embodiment is used and the connectors 6 and 7 are joined to the header tank 4 by welding, a stable joined state between the connectors 6 and 7 and the header tank 4 is secured. It becomes possible to ensure the airtightness of the header tank 4.

  Here, as in the first embodiment, providing the recesses 631 and 731 in the connectors 6 and 7 is advantageous in that it can be performed by simple processing.

  However, when the recesses 631 and 731 are provided in the respective connectors 6 and 7, there is a concern that the recesses 631 and 731 may interfere with the communication hole 61 (71) that connects the external pipe 9 and the header tank 4 in the connectors 6 and 7. The This is a factor that increases restrictions on the design of the connectors 6 and 7.

  On the other hand, in this embodiment, the projections 633 (733) are formed on the end sides in the stacking direction of the connectors 6 and 7, and the end portions in the stacking direction of the projections 633 (733) are welded to the welding position 634. (734). According to this, since the interference between the protrusion 633 (733) and the communication hole 61 (71) formed in each connector 6, 7 does not occur, the degree of freedom in designing the connectors 6, 7 can be increased. There are advantages such as.

(Other embodiments)
As mentioned above, although embodiment of this invention was described, this invention is not limited to the above-mentioned embodiment, In the range described in the claim, it can change suitably. For example, various modifications are possible as follows.

  (1) In the above-described embodiment, the example in which the heat exchanger (heat radiator, evaporator) of the present invention is applied to a vehicle air conditioner constituting a supercritical refrigeration cycle is described, but the present invention is not limited to this. The heat exchanger according to the present invention is applied to a heat exchanger (condenser or evaporator) for an air conditioner constituting a normal subcritical refrigeration cycle, or a heat exchanger (radiator) used for cooling a vehicle engine or the like. May be. Of course, the present invention is not limited to a vehicle and may be applied to a heat exchanger for other uses.

  (2) As in the above-described embodiments, from the viewpoint of improving the corrosion resistance of the header tank 4, it is desirable to form the sacrificial anticorrosion layer 413 on the outer surface of the header tank 4, but the present invention is not limited to this, and the sacrificial anticorrosion layer is not limited thereto. 413 may be abolished.

  (3) The manufacturing procedure of the radiator 1 described in the above embodiments is an example, and the radiator 1 may be manufactured by another manufacturing procedure.

  (4) In each of the above-described embodiments, the elements constituting the embodiment are not necessarily essential unless explicitly stated as essential and clearly considered essential in principle. Needless to say. In addition, each above-mentioned embodiment can be combined in the possible range.

  (5) In each of the above-described embodiments, when numerical values such as the number, numerical value, quantity, range, etc. of the constituent elements of the embodiment are mentioned, a specific number is clearly specified when clearly indicated as essential and in principle. It is not limited to the specific number except when limited to.

  (6) In each of the above-described embodiments, when referring to the shape, positional relationship, etc. of the component, etc., unless otherwise specified and in principle limited to a specific shape, positional relationship, etc. It is not limited to shape, positional relationship, and the like.

1 radiator (heat exchanger)
2 Heat exchange core (laminate)
4 Header tank 41 Tank outer shell member 412 Outer peripheral end 42 Plate member 422 Outer edge 6 Inlet side connector (connector)
63 Contact part 7 Outlet connector (connector)
73 Contact part

Claims (6)

A laminate (2) in which a plurality of tubes (21) through which a heat exchange target fluid is circulated, and
A header tank (4) extending in the stacking direction of the stacked body and connected to the longitudinal ends of each of the plurality of tubes and having an internal space communicating with the inside of the plurality of tubes;
Connectors (6, 7) for connecting the pipe (9) through which the heat exchange target fluid flows to the header tank and communicating the flow passage (91) of the heat exchange target fluid in the pipe with the internal space of the header tank. And comprising
The header tank has a plate member (42) to which the longitudinal ends of each of the plurality of tubes are joined, and an inner surface formed between the plate member and the plate member, and the outer surface. A tank outer shell member (41) to which the connector is joined,
The tank outer shell member has an outer peripheral end portion (412) coupled to the outer edge portion while facing an outer edge portion (422) constituting a peripheral edge of the plate member,
The connector has contact portions (63, 73) that contact the outer surface of the tank outer shell member, and an end portion side in the stacking direction at the contact portion is an outer surface of the tank outer shell member by welding. Are joined to
The welding position (632, 634, 732, 734) with the tank outer shell member at the contact portion is the thickness (Th1) in the facing direction of the connector and the tank outer shell member is the largest at the contact portion. The heat exchange is characterized in that it is thinner than the part having the large thickness and the distance (L1) from the outer peripheral end is longer than the part having the shortest distance in the contact part. vessel. The connector has recesses (631, 731) on the end side in the stacking direction at the contact portion,
2. The heat according to claim 1, wherein the thickness of the welding position (632, 732) of the contact part is thinner than that of the other part of the contact part. Exchanger. The contact portion of the connector is provided with protrusions (633, 733) that protrude in the stacking direction and have a smaller thickness than other portions of the contact portion.
The heat exchanger according to claim 1, wherein the welding position (634, 734) is an end of the protrusion in the stacking direction.   The sacrificial anticorrosion layer (413) which consists of a metal lower in potential than the material which comprises the said tank outer shell member is formed in the surface side of the said tank outer shell member, The thru | or 3 characterized by the above-mentioned. The heat exchanger as described in any one of these.   The tank outer shell member is joined to the plate member by brazing in a state where the outer peripheral end portion is coupled to the outer edge portion and the connector is joined to an outer surface by welding. The heat exchanger according to any one of claims 1 to 4, wherein the heat exchanger is characterized in that: A method of manufacturing a heat exchanger according to any one of claims 1 to 5,
A caulking step for joining the tank outer shell member and the plate member by bending a part of the outer edge portion of the plate member along the outer periphery of the outer peripheral end of the tank outer shell member;
A welding step of welding the connector to the outer surface of the tank outer shell member coupled to the plate member by welding;
A brazing step of joining the tank shell member to which the connector is joined, and the plate member by brazing;
A method for producing a heat exchanger, comprising:

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