Heat exchanger

Abstract

To provide a heat exchanger for keeping a heat conductivity high even when joining structural members to each other with adhesive.SOLUTION: The heat exchanger includes a first member 10 provided with a first heat transmission region 10z, a second member 20 provided with a second heat transmission region 20z to be joined to the first heat transmission region 10z, and a resin material 6 for joining the first heat transmission region 10z and the second heat transmission region 20z. A distance between the first heat transmission region 10z and the second heat transmission region 20z is constant. A retreat region 12z is provided adjacent to the first heat transmission region 10z and the second heat transmission region 20z and between the first member 10 and the second member 20. The thickness of the resin material 6 in the retreat region 12z is greater than the thickness of the resin material 6 between the first heat transmission region 10z and the second heat transmission region 20z.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present disclosure relates to a heat exchanger.

Background Art

[0002] Patent Document 1 below describes a heat exchanger in which constituent members are joined with an adhesive. Although it is required to keep the thermal conductivity high between the constituent members of the heat exchanger, the adhesive has a low thermal conductivity. Therefore, Patent Document 1 attempts to solve this problem by including a filler with high thermal conductivity in the adhesive.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In Patent Document 1, heat is transferred through the portion where the constituent member and the filler are in contact. However, when the filler is spherical, for example, the contact area between the constituent member and the filler becomes extremely narrow. When trying to transfer heat through this narrow contact portion, heat transfer is inhibited by the contact resistance corresponding to the small contact area. Therefore, it is conceivable to increase the surface area by enlarging the filler. However, since the total volume of the portion joined with the adhesive does not change, increasing the size of the filler decreases the allowable content, and as a result, the contact area cannot be increased. Therefore, in the configuration of the heat exchanger as described in Patent Document 1, it is morphologically difficult to increase the heat transfer efficiency.

[0005] An object of the present disclosure is to maintain a high thermal conductivity even when joining constituent members with an adhesive.

Means for Solving the Problems

[0006] The present disclosure relates to a heat exchanger that performs heat exchange between a first medium and a second medium, and includes a first member (10, 10A, 10E) provided with a first heat transfer region (10z, 10Az, 10Bz, 10Cz, 10Dza, 10Dzb, 10Ez) and forming a first flow path (1b) for flowing the first medium in a first direction; a second member (20, 20A, 20B, 20C, 20D, 20E) provided with a second heat transfer region (20z, 20Az, 20Bz, 20Cz, 20Dza, 20Dzb, 20Ez) joined to the first heat transfer region and forming a second flow path (1a) for flowing the second medium in a second direction intersecting the first direction; and a resin material (6) having a lower thermal conductivity than the thermal conductivities of the first member and the second member and joining the first heat transfer region and the second heat transfer region. The distance between the first heat transfer region and the second heat transfer region is constant, and a retreat region (12z, 12Az, 12Bz, 12Cz, 12Dz, 12Ez) is provided adjacent to the first heat transfer region and the second heat transfer region and between the first member and the second member, and the thickness of the resin material in the retreat region is greater than the thickness of the resin material between the first heat transfer region and the second heat transfer region.

Advantages of the Invention

[0007] According to the present disclosure, the thermal conductivity can be kept high even when joining constituent members with an adhesive.

Brief Description of the Drawings

[0008]

Figure 1

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Figure 6

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Figure 13

DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, the present embodiment will be described with reference to the accompanying drawings. For ease of understanding of the description, the same reference numerals are given to the same components in each drawing as much as possible, and duplicate descriptions are omitted.

[0010] As shown in FIG. 1, the heat exchanger 1 includes a core portion 2 and header tanks 3 and 4. The heat exchanger 1 performs heat exchange between a first medium and a second medium. The core portion 2 includes tubes 10 and fins 20. The tubes 10 are configured such that the first medium flows through their interiors. A plurality of tubes 10 are provided, and the tubes 10 and the fins 20 are alternately laminated.

[0011] The refrigerant, which is the first medium, flows from the header tank 3 into the tubes 10, turns back at the header tank 4 and re-enters the tubes 10, and then flows into the header tank 3. The header tank 3 is provided with an inlet portion 31 for receiving the refrigerant and an outlet portion 32 for discharging the refrigerant.

[0012] In FIG. 1, an x-axis, a y-axis, and a z-axis orthogonal to each other are set. The x-axis is set along the longitudinal direction of the tube 10 such that the + direction is from the header tank 4 toward the header tank 3. The y-axis is set such that the + direction is from the upstream side to the downstream side of the air flow along the direction in which the passing air, which is the second medium, flows into the core portion 2 in FIG. 1. The z-axis is set along the longitudinal direction of the header tanks 3 and 4 such that the + direction is from the lower side to the upper side in FIG. 1.

[0013] As shown in FIG. 2, the fins 20 are configured such that the passing air, which is the second medium, flows therethrough. A second flow path 1a through which the passing air flows is provided in the fins 20. A first flow path 1b through which the refrigerant, which is the first medium, flows is provided in the tube 10. The fins 20 and the tube 10 are in contact with each other and are configured to be heat-exchangeable. Therefore, the passing air flowing through the fins 20 and the refrigerant flowing through the tube 10 are configured to be heat-exchangeable.

[0014] With reference to FIG. 3, the joint portion between the tube 10 and the fins 20 will be described. As shown in FIG. 3, the tube 10 and the fins 20 are joined by a resin material 6. The resin material 6 functions as an adhesive, and a material having a melting point lower than the melting points of the tube 10 and the fins 20 is selected. As the resin material 6, for example, a liquid thermoplastic and thermosetting material mainly composed of an epoxy resin is selected.

[0015] Since the resin material 6 is a material that functions as an adhesive, its thermal conductivity is low, for example, λ = 0.3 [W / mK]. On the other hand, since aluminum is selected as the material for the tube 10 and the fins 20, their thermal conductivity is high, for example, 250 [W / mK].

[0016] In the present embodiment, the resin material 6 is extremely thin, and a wide area where the tube 10 and the fins 20 are close to each other is ensured. By ensuring a wide area where the tube 10 and the fins 20 are close to each other, the heat exchange efficiency between the tube 10 and the fins 20 is increased.

[0017] The fin 20 is provided with a flat second heat transfer region 20z. The second heat transfer region 20z is in contact with the tube 10. In the tube 10, the portion in contact with the second heat transfer region 20z is the first heat transfer region 10z. A layer of an extremely thin resin material 6 is interposed between the first heat transfer region 10z and the second heat transfer region 20z.

[0018] The fin 20 is provided with a bent portion 20r adjacent to the second heat transfer region 20z. The bent portion 20r has an arc shape and is connected to the end of the second heat transfer region 20z. The bent portion 20r is separated from the tube 10 as it goes outward from the second heat transfer region 20z.

[0019] The region between the bent portion 20r and the tube 10 is the retraction region 12z. The resin material 6 also exists in the retraction region 12z. Incidentally, let the length along the x-axis direction of the second heat transfer region 20z be the joining length Ftop_len. Also, let the pitch of the fin 20 be Fp and the thickness of the fin 20 be Ft.

[0020] Referring to FIG. 4, the retraction region 12z will be described. FIGS. 4(A) and 4(B) are diagrams for explaining the steps when joining the fin 20 to the tube 10. As shown in FIG. 4(A), the resin material 6 is applied to the first heat transfer region 10z of the tube 10. The fin 20 is arranged such that the second heat transfer region 20z is located on the side opposite to the first heat transfer region 10z with the resin material 6 interposed therebetween. Then, an assembling load L is applied to the fin 20. As shown in FIG. 4(B), the resin material 6 is thinly stretched and a part of it flows out into the retraction region 12z.

[0021] Further explanation will be added with reference to FIG. 5. FIG. 5(A) is a diagram for explaining the force applied in the direction of extruding the resin material 6, and FIG. 5(B) is a partially enlarged view of FIG. 5(A). As shown in FIG. 5(A), when the assembling load L described in FIG. 4(A) is applied, an extrusion force Ex toward the retraction region 12z is applied to the resin material 6. As shown in FIG. 5(B), at the bent portion 20r, a partial force Lp of the assembling load is applied to the resin material 6, which promotes the resin material 6 to flow out into the retraction region 12z.

[0022] Next, with reference to FIG. 6, the tube 10A and the fin 20A as a modified example will be described. The fin 20A is provided with a flat second heat transfer region 20Az. The second heat transfer region 20Az is in contact with the tube 10A.

[0023] In the tube 10A, the portion in contact with the second heat transfer region 20Az is the first heat transfer region 10Az. An extremely thin layer of the resin material 6 is interposed between the first heat transfer region 10Az and the second heat transfer region 20Az.

[0024] The first heat transfer region 10Az is provided with a plurality of grooves 101A. The grooves 101A are provided along the y-axis direction, which is the direction in which the second medium flows through the second flow path 1a. The portion between adjacent grooves 101A is a convex portion 102A. The convex portion 102A is the portion in contact with the second heat transfer region 20Az.

[0025] The fin 20A is provided with a bent portion 20Ac adjacent to the second heat transfer region 20Az. The bent portion 20Ac is a so-called chamfered portion and is connected to the end of the second heat transfer region 20Az. The bent portion 20Ac is separated from the tube 10A as it extends outward from the second heat transfer region 20Az.

[0026] The region between the bent portion 20Ac and the tube 10A is a retreat region 12Az. The resin material 6 also exists in the retreat region 12Az. Incidentally, let the length along the x-axis direction of the second heat transfer region 20Az be the joining length Ftop_len. Also, let the pitch of the fin 20A be Fp and the thickness of the fin 20A be Ft.

[0027] Next, with reference to FIGS. 7, 8, and 9, the heat transfer efficiency of the heat exchanger 1 will be described. FIG. 7 is a diagram showing the tube 10 and the fin 20B used for explaining the heat transfer efficiency. FIG. 8 is a graph for explaining the heat transfer efficiency. FIG. 9 is a diagram showing the tube 10P and the fin 20P as a comparative example.

[0028] As shown in FIG. 7, the fin 20B is provided with a flat second heat transfer region 20Bz. The second heat transfer region 20Bz is in contact with the tube 10. In the tube 10, the portion in contact with the second heat transfer region 20Bz is the first heat transfer region 10Bz. An extremely thin layer of the resin material 6 is interposed between the first heat transfer region 10Bz and the second heat transfer region 20Bz.

[0029] The fin 20B is provided with a bent portion 20Bc adjacent to the second heat transfer region 20Bz. The bent portion 20Bc is a so-called chamfered portion and is connected to the end of the second heat transfer region 20Bz. The bent portion 20Bc is separated from the tube 10 as it extends outward from the second heat transfer region 20Bz.

[0030] The region between the bent portion 20Bc and the tube 10 is a retreat region 12Bz. The resin material 6 also exists in the retreat region 12Bz. Incidentally, let the length along the x-axis direction of the second heat transfer region 20Bz be the joint length Ftop_len. Also, let the pitch of the fin 20B be Fp and the thickness of the fin 20A be Ft.

[0031] As shown in FIG. 9, the tube 10P and the fin 20P as a comparative example do not have the heat transfer region formed in the present embodiment. The tube 10P and the fin 20P are joined by the resin material 6. The fin 20P at the portion facing the tube 10P is curved, and the joint length LB is short.

[0032] FIG. 8 is a graph with the joint length on the horizontal axis and the brazing ratio heat transfer rate on the vertical axis. The joint length is Ftop_len in FIG. 7 and LB in FIG. 9. The brazing ratio heat transfer rate indicates the heat transfer rate with respect to setting the heat transfer rate of the brazed tube and fin to 100.

[0033] The joining length Ftop_len of this embodiment is ensured to be 0.4 mm or more, and the brazing specific heat transfer rate is about 95%. On the other hand, the joining length LB of the comparative example is about 0.05 mm, and the brazing specific heat transfer rate is about 50%. Therefore, a performance improvement of about 45% has been achieved in this embodiment compared to the comparative example.

[0034] Figure 10 is a graph with the ratio of the joining length to the fin thickness on the horizontal axis and the brazing specific heat transfer rate on the vertical axis. The ratio of the joining length to the fin thickness on the horizontal axis indicates that, for example, if it is "Ft", the joining length is the same dimension as the fin thickness, and if it is "4Ft", the joining length is four times the dimension of the fin thickness.

[0035] When the joining length is grasped as the ratio to the fin thickness, if a joining length twice the fin thickness is ensured, the brazing specific heat transfer rate will be about 90%. Also, if a joining length equivalent to the fin thickness is ensured, the brazing specific heat transfer rate will be about 70%.

[0036] Referring to Figure 11, the fin 20C according to the modified example will be described. As shown in Figure 11, the fin 20C is bent at an acute angle from the flat portion where the second heat transfer region 20Cz is formed. A bent portion 20Cr is formed at the bent portion. A retreat region 12Cz is formed between the bent portion 20Cr and the tube 10. A first heat transfer region 10Cz is formed at the portion of the tube 10 facing the second heat transfer region 20Cz.

[0037] Referring to Figure 12, the fin 20D according to the modified example will be described. A concave portion 202D and a pair of convex portions 201D are formed at the portion of the fin 20D facing the tube 10. The pair of convex portions 201D are arranged so as to sandwich the concave portion 202D in the x-axis direction. The surfaces of the pair of convex portions 201D facing the tube 10 are flat second heat transfer regions 20Dza, 20Dzb. The second heat transfer regions 20Dza, 20Dzb are in contact with the tube 10.

[0038] In the tube 10, the portions in contact with the second heat transfer regions 20Dza and 20Dzb are the first heat transfer regions 10Dza and 20Dzb. A layer of an extremely thin resin material 6 is interposed between the first heat transfer regions 10Dza and 20Dz and the second heat transfer regions 20Dza and 20Dzb.

[0039] The fin 20D is provided with a bent portion 20Dc adjacent to the second heat transfer regions 20Dza and 20Dzb. The bent portion 20Dc is a so-called chamfered portion and is connected to the ends of the second heat transfer regions 20Dza and 20Dzb. The bent portion 20Dc is separated from the tube 10 as it extends from the second heat transfer regions 20Dza and 20Dzb toward the outside and the center side of the concave portion 202D.

[0040] The region between the bent portion 20Dc and the tube 10 is a retreat region 12Dz. The resin material 6 also exists in the retreat region 12Dz. In the case of this modification, since the retreat region 12Dz is also formed on the concave portion 202D side, the thinning of the resin material 6 between the first heat transfer regions 10Dza and 20Dz and the second heat transfer regions 20Dza and 20Dzb is further promoted. Incidentally, the total value of the lengths of the second heat transfer regions 20Dza and 20Dzb along the x-axis direction corresponds to the joint length Ftop_len. If the lengths of the second heat transfer regions 20Dza and 20Dzb along the x-axis direction are sufficiently ensured, the heat transfer performance can be ensured.

[0041] With reference to FIG. 13, the tube 10E and the fin 20E according to the modification will be described. The fin 20E is provided with a second heat transfer region 20Ez that is curved to be convex on the tube 10E side. The tube 10E is provided with a concave portion 10Ea that is curved to be concave with respect to the fin 20E. The second heat transfer region 20Ez is in contact with the concave portion 10Ea.

[0042] In the tube 10E, the portion in contact with the second heat transfer region 20Ez is the first heat transfer region 10Ez. A layer of an extremely thin resin material 6 is interposed between the first heat transfer region 10Ez and the second heat transfer region 20Ez.

[0043] In the fin 20E, the portion adjacent to the second heat transfer region 20Az is bent with respect to the tube 10E. Therefore, it is separated from the tube 10E as it goes outward from the second heat transfer region 20Ez.

[0044] The region between the fin 20E and the tube 10E is the evacuation region 12Ez. The resin material 6 also exists in the evacuation region 12Ez. In addition, the length along the x-axis direction of the second heat transfer region 20Ez and along the curved surface corresponds to the joint length Ftop_len.

[0045] [Appendix] The following Appendices 1 to 9 can be arbitrarily combined as long as there is no technical contradiction.

[0046] [Appendix 1] A heat exchanger 1 that performs heat exchange between a first medium and a second medium, A first member (in this embodiment, the tubes 10, 10A, 10E as an example) provided with first heat transfer regions 10z, 10Az, 10Bz, 10Cz, 10Dza, 10Dzb, 10Ez and forming a first flow path 1b for flowing the first medium in a first direction, A second member (in this embodiment, the fins 20, 20A, 20B, 20C, 20D, 20E as an example) provided with second heat transfer regions 20z, 20Az, 20Bz, 20Cz, 20Dza, 20Dzb, 20Ez joined to the first heat transfer regions 10z, 10Az, 10Bz, 10Cz, 10Dza, 10Dzb, 10Ez and forming a second flow path 1a for flowing the second medium in a second direction intersecting the first direction, A resin material 6 having a lower thermal conductivity than the thermal conductivities of the first member and the second member and joining the first heat transfer regions 10z, 10Az, 10Bz, 10Cz, 10Dza, 10Dzb, 10Ez and the second heat transfer regions 20z, 20Az, 20Bz, 20Cz, 20Dza, 20Dzb, 20Ez, The distance between the first heat transfer regions 10z, 10Az, 10Bz, 10Cz, 10Dza, 10Dzb, 10Ez and the second heat transfer regions 20z, 20Az, 20Bz, 20Cz, 20Dza, 20Dzb, 20Ez is constant, and there are provided retreat regions 12z, 12Az, 12Bz, 12Cz, 12Dz, 12Ez adjacent to the first heat transfer regions 10z, 10Az, 10Bz, 10Cz, 10Dza, 10Dzb, 10Ez and the second heat transfer regions 20z, 20Az, 20Bz, 20Cz, 20Dza, 20Dzb, 20Ez and between the first member and the second member. The heat exchanger 1 in which the thickness of the resin material 6 in the retreat regions 12z, 12Az, 12Bz, 12Cz, 12Dz, 12Ez is thicker than the thickness of the resin material 6 between the first heat transfer regions 10z, 10Az, 10Bz, 10Cz, 10Dza, 10Dzb, 10Ez and the second heat transfer regions 20z, 20Az, 20Bz, 20Cz, 20Dza, 20Dzb, 20Ez.

[0047] According to Supplementary Note 1, since the resin material 6 is also arranged in the retreat regions 12z, 12Az, 12Bz, 12Cz, 12Dz, 12Ez, the resin material 6 between the first heat transfer regions 10z, 10Az, 10Bz, 10Cz, 10Dza, 10Dzb, 10Ez and the second heat transfer regions 20z, 20Az, 20Bz, 20Cz, 20Dza, 20Dzb, 20Ez can be made thinner, and the remaining resin material 6 can be arranged in the retreat regions 12z, 12Az, 12Bz, 12Cz, 12Dz, 12Ez. Therefore, the heat transfer efficiency between the first heat transfer regions 10z, 10Az, 10Bz, 10Cz, 10Dza, 10Dzb, 10Ez and the second heat transfer regions 20z, 20Az, 20Bz, 20Cz, 20Dza, 20Dzb, 20Ez can be enhanced.

[0048] [Supplementary Note 2] The heat exchanger 1 according to Supplementary Note 1, wherein the retreat regions 12z, 12Az, 12Bz, 12Cz, 12Dz, 12Ez are formed by the distance between the first member and the second member being farther than the distance between the first heat transfer regions 10z, 10Az, 10Bz, 10Cz, 10Dza, 10Dzb, 10Ez and the second heat transfer regions 20z, 20Az, 20Bz, 20Cz, 20Dza, 20Dzb, 20Ez.

[0049] According to Supplementary Note 2, by changing the distance between the first member and the second member, the retreat regions 12z, 12Az, 12Bz, 12Cz, 12Dz, 12Ez are formed, so that the heat transfer efficiency between the first heat transfer regions 10z, 10Az, 10Bz, 10Cz, 10Dza, 10Dzb, 10Ez and the second heat transfer regions 20z, 20Az, 20Bz, 20Cz, 20Dza, 20Dzb, 20Ez can be increased by a simple means.

[0050] [Supplementary Note 3] The first heat transfer regions 10z, 10Az, 10Bz, 10Cz, 10Dza, 10Dzb and the second heat transfer regions 20z, 20Az, 20Bz, 20Cz, 20Dza, 20Dzb are each flat, and the retreat regions 12z, 12Az, 12Bz, 12Cz, 12Dz are formed by the bending of the second member. The heat exchanger 1 described in Supplementary Note 2.

[0051] According to Supplementary Note 3, by the bending of the second member, the retreat regions 12z, 12Az, 12Bz, 12Cz, 12Dz, 12Ez are formed, so that the heat transfer efficiency between the first heat transfer regions 10z, 10Az, 10Bz, 10Cz, 10Dza, 10Dzb and the second heat transfer regions 20z, 20Az, 20Bz, 20Cz, 20Dza, 20Dzb can be increased by a simple means.

[0052] [Supplementary Note 4] The retreat regions 12z, 12Az, 12Bz, 12Cz, 12Dz, 12Ez are provided so as to sandwich the first heat transfer regions 10z, 10Az, 10Bz, 10Cz, 10Dza, 10Dzb, 10Ez and the second heat transfer regions 20z, 20Az, 20Bz, 20Cz, 20Dza, 20Dzb, 20Ez in the second direction. The heat exchanger 1 described in any one of Supplementary Notes 1 to 3.

[0053] According to Supplementary Note 4, the resin material 6 can be extruded into the evacuation regions 12z, 12Az, 12Bz, 12Cz, 12Dz, 12Ez provided on both sides of the first heat transfer regions 10z, 10Az, 10Bz, 10Cz, 10Dza, 10Dzb, 10Ez and the second heat transfer regions 20z, 20Az, 20Bz, 20Cz, 20Dza, 20Dzb, 20Ez, and the heat transfer efficiency between the first heat transfer regions 10z, 10Az, 10Bz, 10Cz, 10Dza, 10Dzb and the second heat transfer regions 20z, 20Az, 20Bz, 20Cz, 20Dza, 20Dzb can be increased by a simple means.

[0054] [Supplementary Note 5] The first member is the tubes 10, 10A, 10E, and the second member is the fins 20, 20A, 20B, 20C, 20D, 20E that alternately contact the tubes 10, 10A, 10E arranged opposite to each other at a constant pitch Fp, The joining length Ftop_len, which is the length along the first direction of the first heat transfer regions 10z, 10Az, 10Bz, 10Cz, 10Dza, 10Dzb, 10Ez and the second heat transfer regions 20z, 20Az, 20Bz, 20Cz, 20Dza, 20Dzb, 20Ez, is equal to or greater than the thickness Ft of the fins 20, 20A, 20B, 20C, 20D, 20E that are the second member, and is equal to or less than half of the pitch Fp. The heat exchanger 1 according to any one of Supplementary Notes 1 to 4.

[0055] [Supplementary Note 6] The heat exchanger 1 according to Supplementary Note 5, wherein the joining length Ftop_len is equal to or greater than twice the thickness Ft of the fins 20, 20A, 20B, 20C, 20D, 20E that are the second member, and is equal to or less than half of the pitch Fp.

[0056] [Supplementary Note 7] In the heat exchanger 1 according to any one of Supplementary Notes 1 to 6, a groove into which the resin material enters is formed in the first heat transfer region or the second heat transfer region. As a specific example, as described with reference to FIG. 6, it is the groove 101A formed in the first heat transfer region 10Az into which the resin material 6 enters.

[0057] [Supplementary Note 8] The heat exchanger 1 according to any one of Appendices 1 to 7, wherein the width along the first direction of the groove is smaller than the joining length Ftop_len which is the length along the first direction of the first heat transfer region and the second heat transfer region.

[0058] [Appendix 9] The heat exchanger according to any one of Appendices 1 to 7, wherein the width along the first direction of the groove is smaller than the joining length Ftop_len which is the length along the first direction of the first heat transfer region and the second heat transfer region.

[0059] As described above, the present embodiment has been described with reference to specific examples. However, the present disclosure is not limited to these specific examples. Those obtained by appropriately making design changes by those skilled in the art to these 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 of the above-described specific examples, its arrangement, conditions, shape, etc. are not limited to those illustrated and can be appropriately changed. Each element included in each of the above-described specific examples can be appropriately combined as long as no technical contradiction occurs.

Explanation of Reference Numerals

[0060] 10, 10A, 10E: Tubes 10z, 10Az, 10Bz, 10Cz, 10Dza, 10Dzb, 10Ez: First heat transfer regions 20, 20A, 20B, 20C, 20D, 20E: Fins 20z, 20Az, 20Bz, 20Cz, 20Dza, 20Dzb, 20Ez: Second heat transfer regions 12z, 12Az, 12Bz, 12Cz, 12Dz, 12Ez: Retreating regions

Claims

1. A heat exchanger that performs heat exchange between a first medium and a second medium, a first member (10, 10A, 10E) provided with a first heat transfer region (10z, 10Az, 10Bz, 10Cz, 10Dza, 10Dzb, 10Ez) and forming a first flow path (1b) for flowing the first medium in a first direction; a second member (20, 20A, 20B, 20C, 20D, 20E) provided with a second heat transfer region (20z, 20Az, 20Bz, 20Cz, 20Dza, 20Dzb, 20Ez) joined to the first heat transfer region and forming a second flow path (1a) for flowing the second medium in a second direction intersecting the first direction; a resin material (6) having a lower thermal conductivity than the thermal conductivities of the first member and the second member and joining the first heat transfer region and the second heat transfer region, and a distance between the first heat transfer region and the second heat transfer region is constant, and a retreat region (12z, 12Az, 12Bz, 12Cz, 12Dz, 12Ez) is provided adjacent to the first heat transfer region and the second heat transfer region and between the first member and the second member, The heat exchanger, wherein a thickness of the resin material in the retreat region is thicker than a thickness of the resin material between the first heat transfer region and the second heat transfer region.

2. The heat exchanger according to claim 1, wherein the retreat region is formed by a distance between the first member and the second member being farther than a distance between the first heat transfer region and the second heat transfer region.

3. The heat exchanger according to claim 2, wherein the first heat transfer region and the second heat transfer region are each flat, and the retreat region is formed by bending the second member.

4. The heat exchanger according to any one of claims 1 to 3, wherein the retreat region is provided so as to sandwich the first heat transfer region and the second heat transfer region in the second direction.

5. The first member is a tube, and the second member is fins that alternately contact the tubes arranged opposite to each other at a constant pitch, The heat exchanger according to claim 1, wherein a joining length, which is the length along the first direction of the first heat transfer region and the second heat transfer region, is equal to or greater than the thickness of the second member and equal to or less than half of the pitch.

6. The heat exchanger according to claim 5, wherein the joining length is equal to or greater than twice the thickness of the second member and equal to or less than half of the pitch.

7. The heat exchanger according to claim 1, wherein grooves into which the resin material penetrates are formed in the first heat transfer region or the second heat transfer region.

8. The heat exchanger according to claim 1, wherein a width along the first direction of the groove is smaller than a joining length, which is the length along the first direction of the first heat transfer region and the second heat transfer region.

9. The heat exchanger according to claim 1, wherein a width along the first direction of the groove is smaller than a joining length, which is the length along the first direction of the first heat transfer region and the second heat transfer region.

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