Plate for heat exchanger and heat exchanger

Abstract

To provide a plate for a heat exchanger which is further improved in heat exchange efficiency, and the heat exchanger.SOLUTION: In a plate for a heat exchanger having a plate main body having a first face and a second face, and a joining part, the plate main body has: a pair of irregularities which protrude to the first face side and are arranged on a diagonal line of the plate main body, and in which a first penetration hole penetrating in a thickness direction is formed; a pair of second irregularities which protrude to the second face side and are arranged on the other diagonal line of the plate main body, and in which a second penetration hole penetrating in the thickness direction is formed; a first rib which is provided closely to the first irregularity and the second irregularity on one side which are adjacent to each other, and protrudes to the first face side; and a second rib which is provided closely to the first irregularity and the second irregularity on the other side which are adjacent to each other, and protrudes to the second face side.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a plate for a heat exchanger, and to a heat exchanger. [Background technology]

[0002] As one type of heat exchanger, a plate-type heat exchanger described in Patent Document 1 below is known. This type of heat exchanger has a pair of plates that are alternately stacked with a gap in the thickness direction. Each plate is formed with a pair of through holes through which a low-temperature fluid and a high-temperature fluid are supplied and discharged. The low-temperature fluid that flows from the through holes into the flow path between the plates can exchange heat with a high-temperature fluid flowing in another flow path adjacent in the thickness direction. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2008-089223 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the heat exchanger described in Patent Document 1, no measures are taken to ensure that the fluid introduced from the through holes is uniformly distributed within the flow paths between the plates, which causes a problem that the efficiency of heat exchange is limited.

[0005] The present disclosure has been made to solve the above-mentioned problems, and has an object to provide a heat exchanger plate and a heat exchanger with further improved heat exchange efficiency. [Means for solving the problem]

[0006] In order to solve the above problems, the present disclosure provides a heat exchanger plate having a plate-shaped plate body having a first surface facing one side in a thickness direction and a second surface facing the other side, and a joint portion rising from an edge of the plate body in the thickness direction, the plate body having a pair of first concave-convex portions protruding to the first surface side and recessed from the second surface side toward the first surface side, disposed on a diagonal line of the plate body and having a first through hole penetrating in the thickness direction, and a pair of first concave-convex portions protruding to the second surface side and recessed from the second surface side toward the first surface side, the pair of first concave-convex portions having a first through hole penetrating in the thickness direction, The plate has a pair of second uneven portions that are recessed from the first surface side toward the second surface side, are arranged on the other diagonal of the plate body, and have second through holes formed therein that penetrate in the thickness direction, a first rib that is provided adjacent to the first uneven portion and the second uneven portion on one side that are adjacent to each other, protrudes toward the first surface side and is recessed from the second surface side toward the first surface side, and a second rib that is provided adjacent to the first uneven portion and the second uneven portion on the other side that are adjacent to each other, protrudes toward the second surface side and is recessed from the first surface side toward the second surface side.

[0007] The heat exchanger according to the present disclosure comprises a heat exchanger plate as the above-mentioned first plate, a second plate stacked on the first plate from the first surface side, having a flat blocking surface abutting a pair of the first uneven portions on the first surface side, and further having a third through hole and a fourth through hole formed at positions corresponding to the first through hole and the second through hole, respectively, and fins provided between the first uneven portions and the second uneven portions in the longitudinal direction of the plate body. Effect of the Invention

[0008] According to the present disclosure, it is possible to provide a heat exchanger plate and a heat exchanger with further improved heat exchange efficiency. [Brief description of the drawings]

[0009] [Figure 1] FIG. 2 is a plan view illustrating a configuration of a heat exchanger according to an embodiment of the present disclosure. [Diagram 2] FIG. 2 is a cross-sectional view taken along line II-II in FIG. [Diagram 3] FIG. 2 is a cross-sectional view taken along line III-III in FIG. [Figure 4] FIG. 4 is an enlarged plan view of a main portion showing a modified example of a heat exchanger plate (first plate) according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] (Configuration of Heat Exchanger 1) Hereinafter, a heat exchanger 1 according to an embodiment of the present disclosure will be described with reference to Figs. 1 to 3. The heat exchanger 1 is suitably applied to transportation machinery such as vehicles and aircraft. As shown in Figs. 1 to 3, the heat exchanger 1 includes a plurality of first plates 10 (heat exchanger plates 90) and a plurality of second plates 20, which are alternately stacked, a high-temperature fluid supply section 30, a high-temperature fluid discharge section 40, a low-temperature fluid supply section 50, a low-temperature fluid discharge section 60, and fins 70. The high-temperature fluid flows through a flow path F formed between the first plate 10 and the second plate 20 from the high-temperature fluid supply section 30 toward the high-temperature fluid discharge section 40. The low-temperature fluid flows through the flow path F from the low-temperature fluid supply section 50 toward the low-temperature fluid discharge section 60. During this time, heat exchange occurs between the high-temperature fluid and the low-temperature fluid.

[0011] (Configuration of first plate 10) As shown in Figures 2 and 3, the first plate 10 has a plate body 11, a pair of first uneven portions 12, a pair of second uneven portions 13, a first rib 14, a second rib 15, and a joint portion 16.

[0012] The plate body 11 has a rectangular plate shape. The surface of the plate body 11 facing one side in the thickness direction is a first surface 17a, and the surface facing the other side is a second surface 17b. A first uneven portion 12 is provided on one of two diagonal lines connecting four corners of the plate body 11. The first uneven portion 12 protrudes toward the first surface 17a and is recessed from the second surface 17b toward the first surface 17a. In a cross-sectional view, the top surface of the first uneven portion 12 is flat and parallel to the plate body 11. A first through hole 18 penetrating in the thickness direction is formed in the top surface of the first uneven portion 12. The first through hole 18 is circular, elliptical, or rectangular.

[0013] Of the two diagonals connecting the four corners of the plate body 11, a second uneven portion 13 is provided on the other diagonal. The second uneven portion 13 protrudes toward the second surface 17b and is recessed from the first surface 17a toward the second surface 17b. In a cross-sectional view, the top surface of the second uneven portion 13 is flat and parallel to the plate body 11. A second through hole 19 is formed in the top surface of the second uneven portion 13, penetrating in the thickness direction. The second through hole 19 is circular, elliptical, or rectangular.

[0014] On both sides in the longitudinal direction of the plate body 11, one first uneven portion 12 and one second uneven portion 13 are adjacent to each other. The boundary between the adjacent first uneven portion 12 and second uneven portion 13 is connected by a continuous surface. In other words, no step or the like is formed between these first uneven portion 12 and second uneven portion 13.

[0015] The first rib 14 and the second rib 15 are provided close to the first uneven portion 12 and the second uneven portion 13 adjacent to each other on both sides in the longitudinal direction of the plate body 11. The first rib 14 is provided between the first uneven portion 12 and the second uneven portion 13 on one side. The first rib 14 protrudes toward the first surface 17a and is recessed from the second surface 17b toward the first surface 17a. When viewed from the first surface 17a, the first rib 14 extends toward the second uneven portion 13 from one side to the other side in the longitudinal direction of the plate body 11. A plurality of first ribs 14 are provided at intervals in a direction perpendicular to the longitudinal direction of the first rib 14. Both ends of the first rib 14 in the longitudinal direction are arc-shaped.

[0016] The second rib 15 is provided between the first uneven portion 12 and the second uneven portion 13 on the other side. The second rib 15 protrudes toward the second surface 17b and is recessed from the first surface 17a toward the second surface 17b. When viewed from the second surface 17b, the second rib 15 extends toward the second uneven portion 13 from the other side toward one side in the longitudinal direction of the plate body 11. A plurality of second ribs 15 are provided at intervals in a direction perpendicular to the longitudinal direction of the second ribs 15. Both ends of the second rib 15 in the longitudinal direction are arc-shaped.

[0017] A joint 16 is provided on the edge on the outer periphery of the plate body 11. The joint 16 rises in the thickness direction from the edge of the plate body 11. The joint 16 extends so as to widen toward the outer periphery as it moves away from the plate body 11 in the thickness direction.

[0018] (Configuration of second plate 20) As shown in FIG. 2 or FIG. 3, the second plate 20 is laminated on the first plate 10 from the first surface 17a side. The second plate 20 has a second plate body 21 and a joint portion 16 similar to those of the first plate 10. In addition, a third through hole 22 and a fourth through hole 23 are formed at positions corresponding to the first through hole 18 and the second through hole 19 in the second plate 20, respectively. Therefore, when viewed from the thickness direction, the first through hole 18 and the third through hole 22 open coaxially, and the second through hole 19 and the fourth through hole 23 open coaxially. On the other hand, unlike the first plate 10, the second plate 20 does not have the first uneven portion 12 or the second uneven portion 13 formed thereon. In other words, the second plate body 21 is flat.

[0019] In a state where the first plate 10 and the second plate 20 are stacked, the surface of the second plate 20 facing the first plate 10 is the closed surface 24a. The surface facing the opposite side of the closed surface 24a is the top surface 24b. The closed surface 24a is in surface contact with the top surface of the first uneven portion 12 of the first plate 10. Although not shown in detail, a brazing material 80 is interposed between the closed surface 24a and the top surface by brazing. The second surface 17b side of the second uneven portion 13 of the first plate 10 is in surface contact with the top surface 24b of the second plate 20. A brazing material 80 is interposed between the top surface 24b and the second surface 17b by brazing.

[0020] In addition, a brazing material 80 is interposed between the joint portion 16 of the first plate 10 and the joint portion 16 of the second plate 20 by brazing. The brazing material 80 ensures liquid-tightness between the first plate 10 and the second plate 20. The space formed between the first plate 10 and the second plate 20 is a flow path F for the flow of fluid. As shown in FIG. 1, a fin 70 for promoting heat exchange is provided in the flow path F. As an example, the fin 70 extends in the longitudinal direction of the plate body 11 and is provided at intervals in a direction perpendicular to the longitudinal direction. A clearance C extending in the longitudinal direction is formed between the end of the fin 70 in the longitudinal direction and the first uneven portion 12 and the second uneven portion 13. This clearance C is provided to allow the fluid to spread throughout the entire area of ​​the plate body 11.

[0021] The first plates 10 and the second plates 20 as described above are alternately stacked in the thickness direction. In the example of FIG. 2 and FIG. 3, four first plates 10 and four second plates 20 are stacked. Of the flow paths F formed between them, two flow paths F are used by high-temperature fluid, and the remaining two flow paths F are used by low-temperature fluid. More specifically, the high-temperature fluid supplied from the high-temperature fluid supply unit 30 flows into the flow paths F through a space formed on the first surface 17a side of the second uneven portion 13. After flowing between the fins 70 in the flow paths F, the fluid flows into the space formed by the second uneven portion 13 on the opposite side in the longitudinal direction of the plate body 11. The high-temperature fluid is then discharged to the outside through the high-temperature fluid discharge unit 40.

[0022] On the other hand, the low-temperature fluid supplied from the low-temperature fluid supply unit 50 flows into the flow path F through a space formed on the second surface 17b side of the first uneven portion 12. After flowing between the fins 70 in the flow path F, the fluid flows into a space formed by the first uneven portion 12 on the opposite side in the longitudinal direction of the plate body 11. The low-temperature fluid is then discharged to the outside through the low-temperature fluid discharge unit 60. While flowing through each flow path F, the low-temperature fluid and the high-temperature fluid flow adjacent to each other in the thickness direction, and heat exchange occurs between these fluids.

[0023] (Action and effect) Here, in the conventional device of the same type, no measures were taken to ensure that the fluid introduced from the through holes was uniformly distributed within the flow path F between the plates. This resulted in a problem that the efficiency of heat exchange was limited. In order to solve this problem, the present embodiment employs the above-mentioned configurations.

[0024] According to the above configuration, since the first rib 14 protruding toward the first surface 17a is provided, when the fluid flows toward the second uneven portion 13 on one side of the first surface 17a, the first rib 14 guides the flow of the fluid, and the fluid smoothly flows toward the second through hole 19. Furthermore, since the second rib 15 is recessed from the first surface 17a toward the second surface 17b, when the fluid flows out from the second uneven portion 13 on the other side of the first surface 17a, the second rib 15 does not obstruct the flow. This makes it possible to distribute the fluid evenly throughout the entire area of ​​the plate body 11. Therefore, when the heat exchanger plate 90 is used in the heat exchanger 1, the heat exchange efficiency can be significantly improved. Furthermore, the first rib 14 and the second rib 15 abut against other plates adjacent in the thickness direction, and thus the pressure resistance of the heat exchanger 1 is improved. As a result, even when the pressure of the fluid is high, the heat exchanger 1 can be stably operated.

[0025] According to the above configuration, the boundary between the first uneven portion 12 and the second uneven portion 13 is connected by a continuous surface. In other words, no flat surface on which the fluid pressure is applied is formed between the first uneven portion 12 and the second uneven portion 13. This allows the heat exchanger 1 to stably resist the fluid pressure, and the pressure resistance of the heat exchanger 1 can be further improved.

[0026] According to the above configuration, since the first ribs 14 and the second ribs 15 are provided at intervals, the flow of the fluid can be guided more smoothly. As a result, the fluid that has spread throughout the entire area of ​​the plate body 11 can be smoothly collected toward the second through holes 19. This makes it possible to further improve the heat exchange efficiency of the heat exchanger 1. In addition, the multiple first ribs 14 and second ribs 15 make it possible to further improve the pressure resistance performance.

[0027] According to the above configuration, since the ends of the first rib 14 and the second rib 15 in the longitudinal direction are arc-shaped, it is possible to reduce flow resistance when the fluid flows toward the first rib 14 and the second rib 15. Therefore, it is possible to maintain a smoother flow of the fluid on the plate body 11. As a result, it is possible to further improve the heat exchange efficiency of the heat exchanger 1.

[0028] According to the above configuration, the multiple stacked first plates 10 and second plates 20 can supply more high-temperature fluid and low-temperature fluid to the heat exchanger 1. This makes it possible to increase the capacity of the heat exchanger 1. On the other hand, since the dimensions and size are kept small compared to conventional fin-and-tube type devices, the heat exchanger 1 can be easily mounted on objects with many space constraints, such as transportation machinery such as vehicles and aircraft. This makes it possible to further improve the versatility of the heat exchanger 1.

[0029] According to the above configuration, the first uneven portion 12 of the first plate 10 and the closed surface 24a of the second plate 20 are in surface contact with each other. Therefore, the sealing between these surfaces can be ensured by simply performing brazing or diffusion bonding. Therefore, other members for sealing are not required, and the manufacturing cost and maintenance cost of the device can be reduced.

[0030] (Other embodiments) Although the embodiments of the present disclosure have been described in detail above with reference to the drawings, the specific configuration is not limited to this embodiment, and design changes and the like that do not depart from the gist of the present disclosure are also included.

[0031] As shown in FIG. 4 as a modified example, the first uneven portion 12 on the first surface 17a side may have a smaller dimension in the longitudinal direction of the plate body 11 than the adjacent second uneven portion 13. Furthermore, a plurality of second ribs 15 are provided in an area adjacent to the first uneven portion 12 in the longitudinal direction of the plate body 11. According to this configuration, the dimension of the first uneven portion 12 in the longitudinal direction of the plate body 11 is smaller than the dimension of the second uneven portion 13, so that when a fluid flows through the second through hole 19 of the second uneven portion 13, the first uneven portion 12 can be reduced and the fluid can be diffused in the space formed. This makes it possible to distribute the fluid more evenly over the entire area of ​​the plate body 11. Therefore, the heat exchange efficiency of the heat exchanger 1 can be further improved.

[0032] In addition, the number of the first ribs 14 and the second ribs 15 is not limited to the above embodiment, and can be changed appropriately according to the design and specifications. Regardless of the number, the same effect as described above can be obtained.

[0033] Similarly, the number of stacked first plates 10 and second plates 20 is not limited to the above embodiment, and may be changed appropriately according to the design and specifications. In any case, the same effects as those described above can be obtained.

[0034] Moreover, the number and shape of the fins 70 are not limited to those in the above embodiment. Furthermore, pins may be used instead of the fins 70.

[0035] Besides, diffusion bonding may be used instead of brazing to bond the first plate 10 and the second plate 20. In this case as well, good sealing properties can be ensured.

[0036] <Additional Notes> The heat exchanger plate 90 and the heat exchanger 1 described in each embodiment can be understood, for example, as follows.

[0037] (1) A heat exchanger plate 90 according to a first embodiment is a plate-shaped plate body 11 having a first surface 17a facing one side in a thickness direction and a second surface 17b facing the other side, and a joint 16 rising from an edge of the plate body 11 in the thickness direction, wherein the plate body 11 has a pair of first uneven portions 12 that protrude toward the first surface 17a and are recessed from the second surface 17b toward the first surface 17a, are disposed on a diagonal line of the plate body 11, and are formed with first through holes 18 penetrating in the thickness direction, and a pair of first uneven portions 12 that protrude toward the second surface 17b and are recessed toward the first surface 17a. a pair of second uneven portions 13 disposed on the other diagonal line of the plate body 11 and having second through holes 19 penetrating in the thickness direction; a first rib 14 provided adjacent to the first uneven portion 12 and the second uneven portion 13 on one side adjacent to each other, protruding toward the first surface 17a and recessed from the second surface 17b toward the first surface 17a; and a second rib 15 provided adjacent to the first uneven portion 12 and the second uneven portion 13 on the other side adjacent to each other, protruding toward the second surface 17b and recessed from the first surface 17a toward the second surface 17b.

[0038] According to the above configuration, since the first rib 14 protruding toward the first surface 17a is provided, when the fluid flows toward the second uneven portion 13 on one side of the first surface 17a, the flow of the fluid is guided by the first rib 14, and the fluid flows smoothly toward the second through hole 19. In addition, since the second rib 15 is recessed from the first surface 17a toward the second surface 17b, when the fluid flows out from the second uneven portion 13 on the other side of the first surface 17a, the second rib 15 does not obstruct the flow. This makes it possible to distribute the fluid evenly throughout the entire area of ​​the plate body 11.

[0039] (2) A heat exchanger plate 90 according to a second aspect is a heat exchanger plate 90 according to (1), in which the boundaries between adjacent first uneven portions 12 and second uneven portions 13 are connected by a single continuous surface.

[0040] According to the above configuration, the boundary between the first uneven portion 12 and the second uneven portion 13 is connected by a continuous surface. In other words, no flat surface on which the fluid pressure is applied is formed between the first uneven portion 12 and the second uneven portion 13. This allows the heat exchanger 1 to stably resist the fluid pressure, and the pressure resistance of the heat exchanger 1 can be further improved.

[0041] (3) A heat exchanger plate 90 according to a third aspect is a heat exchanger plate 90 according to (1) or (2), wherein the first ribs 14, when viewed from the first surface 17a side, extend toward the second uneven portion 13 from one side to the other side in the longitudinal direction of the plate body 11, and are provided in a plurality of spaces apart in a direction perpendicular to the longitudinal direction of the first ribs 14, and the second ribs 15, when viewed from the second surface 17b side, extend toward the second uneven portion 13 from the other side to one side in the longitudinal direction of the plate body 11, and are provided in a plurality of spaces apart in a direction perpendicular to the longitudinal direction of the second ribs 15.

[0042] According to the above configuration, since a plurality of first ribs 14 and a plurality of second ribs 15 are provided at intervals, the flow of the fluid can be guided more smoothly.

[0043] (4) A heat exchanger plate 90 according to a fourth aspect is a heat exchanger plate 90 according to any one of the aspects (1) to (3), in which the longitudinal ends of the first rib 14 and the second rib 15 are arc-shaped when viewed in the thickness direction.

[0044] According to the above configuration, since the longitudinal ends of the first rib 14 and the second rib 15 are arc-shaped, the flow resistance of the fluid flowing toward the first rib 14 and the second rib 15 can be kept small.

[0045] (5) A heat exchanger plate 90 according to a fifth aspect is a heat exchanger plate 90 according to any one of the aspects (1) to (4), wherein the first uneven portion 12 on the first surface 17a has a smaller dimension in the longitudinal direction of the plate body 11 than the adjacent second uneven portion 13, and the second rib 15 is provided in an area adjacent to the first uneven portion 12 in the longitudinal direction of the plate body 11.

[0046] According to the above configuration, the dimension of the first uneven portion 12 in the longitudinal direction of the plate body 11 is smaller than the dimension of the second uneven portion 13, so that when a fluid flows through the second through hole 19 of the second uneven portion 13, the fluid can be diffused into the space formed by the first uneven portion 12 being reduced in size.

[0047] (6) A heat exchanger 1 according to a sixth aspect includes a heat exchanger plate 90 according to any one of the aspects (1) to (5), a second plate 20 stacked on the first plate 10 from the first surface 17a side, having a flat blocking surface 24a abutting a pair of the first uneven portions 12 on the first surface 17a side, and further having a third through hole 22 and a fourth through hole 23 formed at positions corresponding to the first through hole 18 and the second through hole 19, respectively, and a fin 70 provided between the first uneven portion 12 and the second uneven portion 13 in the longitudinal direction of the plate body 11.

[0048] According to the above configuration, the fluid that flows in from the second through holes 19 of the second uneven portion 13 spreads evenly between the fins 70. This makes it possible to eliminate areas in the plate where the flow velocity is low and to make the flow velocity uniform, thereby improving the heat transfer coefficient and making it possible to significantly improve the heat exchange efficiency of the heat exchanger 1.

[0049] (7) A heat exchanger plate 90 according to a seventh aspect is the heat exchanger 1 of (6), in which the first plates 10 and the second plates 20 are stacked alternately in the thickness direction.

[0050] According to the above configuration, the first plates 10 and the second plates 20, which are stacked in plurality, can supply a larger amount of high-temperature fluid and low-temperature fluid to the heat exchanger 1. [Explanation of symbols]

[0051] 1...Heat exchanger 10...First plate 11...Plate body 12...First uneven portion 13...Second uneven portion 14...First rib 15...Second rib 16...Joint portion 17a...First surface 17b...Second surface 18...First through hole 19...Second through hole 20...Second plate 21...Second plate body 22...Third through hole 23...Fourth through hole 24a...Closed surface 24b...Top surface 30...High temperature fluid supply portion 40...High temperature fluid discharge portion 50...Low temperature fluid supply portion 60...Low temperature fluid discharge portion 70...Fin 80...Brazing material 90...Heat exchanger plate C...Clearance F...Flow path

Claims

1. A plate body having a plate shape and a first surface facing one side in a thickness direction and a second surface facing the other side; a joint portion rising from an edge of the plate body in the thickness direction; A plate for a heat exchanger having The plate body is A pair of first concave-convex portions protruding toward the first surface side and recessed from the second surface side toward the first surface side, disposed on a diagonal line of the plate body, and having first through holes penetrating in the thickness direction; a pair of second concave-convex portions that protrude toward the second surface side and are recessed from the first surface side toward the second surface side, are disposed on another diagonal line of the plate body, and have second through holes that penetrate in the thickness direction; A first rib is provided adjacent to the first uneven portion and the second uneven portion on one side adjacent to each other, protruding toward the first surface side and recessed from the second surface side toward the first surface side; a second rib provided adjacent to the first uneven portion and the second uneven portion on the other side adjacent to each other, protruding toward the second surface side and recessed from the first surface side toward the second surface side; A plate for a heat exchanger comprising:

2. The heat exchanger plate according to claim 1 , wherein the boundaries between the first and second uneven portions adjacent to each other are connected by a continuous surface.

3. The first rib extends toward the second uneven portion from one side to the other side in the longitudinal direction of the plate body when viewed from the first surface side, and is provided at intervals in a direction perpendicular to the longitudinal direction of the first rib, 3. The heat exchanger plate according to claim 1, wherein the second rib extends toward the second uneven portion from the other side to the one side in the longitudinal direction of the plate body when viewed from the second surface side, and a plurality of the second ribs are provided at intervals in a direction perpendicular to the longitudinal direction of the second rib.

4. 3. The heat exchanger plate according to claim 1, wherein ends of the first rib and the second rib in the longitudinal direction are arc-shaped when viewed from the thickness direction.

5. 3. The heat exchanger plate according to claim 1, wherein the first uneven portion on the first surface side has a smaller dimension in the longitudinal direction of the plate body than the adjacent second uneven portions, and the second rib is provided in an area adjacent to the first uneven portion in the longitudinal direction of the plate body.

6. A heat exchanger plate as the first plate according to claim 1 or 2; a second plate that is laminated on the first plate from the first surface side, has a flat closed surface that abuts against the pair of first uneven portions on the first surface side, and further has a third through hole and a fourth through hole that are formed at positions corresponding to the first through hole and the second through hole, respectively; A fin is provided between a first uneven portion and the second uneven portion in a longitudinal direction of the plate body; A heat exchanger comprising:

7. The heat exchanger according to claim 6 , wherein the first plates and the second plates are stacked alternately in the thickness direction.

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