Heat exchanger
Patent Information
- Application Number
- PCT/CN2026/086241
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2025-03-26
- Filing Date
- 2026-03-26
- Publication Date
- 2026-10-01
Smart Images
Figure CN2026086241_01102026_PF_FP_ABST
Abstract
Description
heat exchanger
[0001] This application claims priority to Chinese Patent Application No. 202520539993.3, filed on March 26, 2025, entitled "Heat Exchanger", the entire contents of which are incorporated herein by reference. Technical Field
[0002] This utility model relates to the field of thermal management technology, and in particular to a heat exchanger for a refrigeration system. Background Technology
[0003] Plate heat exchangers consist of multiple stacked plates, with inter-plate channels formed between adjacent plates for fluid flow. Fluid on both sides of the plates can flow on opposite sides of the plates to achieve heat exchange between the plates.
[0004] Utility Model Content
[0005] In related technologies, the inter-plate channel has a boss structure, which can improve the structural strength of the inter-plate channel; the boss structure has a welded plate part, which is suspended during welding and is prone to thermal collapse due to gravity.
[0006] Therefore, it is necessary to provide a heat exchanger that addresses the above-mentioned problems and aims to solve the technical problem of thermal collapse of the boss structure in the inter-plate channel during welding.
[0007] The technical solution adopted in this utility model is as follows:
[0008] A heat exchanger includes stacked heat exchange plates, wherein the heat exchange plates include a first plate and a second plate;
[0009] The first plate has a first boss protruding toward the second plate, and the first boss has a first welding plate portion; the first welding plate portion has at least one first through hole, and at least a portion of the first welding plate portion is welded to the second plate.
[0010] The first boss of the first plate of the technical solution of this application has a first welding plate portion, which is welded to the second plate. Since the first welding plate portion has a first through hole structure, thermal collapse of the first welding plate portion during welding can be reduced. Attached Figure Description
[0011] Figure 1 is a schematic diagram of the heat exchanger in Example 1;
[0012] Figure 2 is a schematic diagram of the structure after the three plates in Figure 1 are stacked;
[0013] Figure 3 is a schematic diagram of the explosion shown in Figure 2;
[0014] Figure 4 is a cross-sectional view along the AA direction in Figure 2;
[0015] Figure 5 is a structural schematic diagram from another perspective of Figure 2;
[0016] Figure 6 is a cross-sectional view along the CC direction in Figure 5;
[0017] Figure 7 is an enlarged view of point A in Figure 6;
[0018] Figure 8 is a cross-sectional view of the first heat exchange plate in Figure 2 after welding with the first plate.
[0019] Figure 9 is a cross-sectional view along the DD direction in Figure 5;
[0020] Figure 10 is an enlarged view of point B in Figure 9;
[0021] Figure 11 is a cross-sectional view along the BB direction in Figure 2;
[0022] Figure 12 is a cross-sectional view of the second heat exchange plate after it is welded to the first plate in Figure 2;
[0023] Figure 13 is a schematic diagram of the structure of the first flow channel plate after welding in Example 2;
[0024] Figure 14 is a schematic diagram of the structure of the second flow channel plate after welding in Example 2. Detailed Implementation
[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of this utility model and are not intended to limit its scope.
[0026] Example 1:
[0027] This embodiment discloses a heat exchanger 1, as shown in Figures 1-7, including a heat exchange core 2. The heat exchange core 2 has a first fluid channel 3 and a second fluid channel 4. The heat exchange core 2 is provided with multiple inter-plate channels 5 and multiple inter-plate flow channels 6, which are isolated from each other and are arranged alternately. The first fluid channel 3 connects two adjacent inter-plate channels 5, and fluid enters the inter-plate channel 5 through a first inlet and the first fluid channel 3. The second fluid channel 4 connects two adjacent inter-plate flow channels 6, and fluid enters the inter-plate flow channel 6 through a second inlet and the second fluid channel 4. The first fluid in the inter-plate channel 5 and the second fluid in the inter-plate flow channel 6 exchange heat through the plate walls. The first fluid and the second fluid can be one type of fluid or two different fluids.
[0028] As shown in Figures 2, 3, and 4, the heat exchange core 2 includes stacked heat exchange plates 7. Each heat exchange plate 7 has a first distribution area 8, a heat exchange area, and a second distribution area 9, with the heat exchange area located between the first distribution area 8 and the second distribution area 9. The heat exchange plate 7 includes a first plate 10 and a second plate 11. The first plate 10 has a first corner hole 12 and a second corner hole 13, both located in the first distribution area 8. The direction of the line connecting the center of the first corner hole 12 and the center of the second corner hole 13 is defined as the first direction X. The plate forming the inter-plate channel 5 includes the first plate 10 and one of the adjacent second plates 11. Plate 10 has a first boss 16 protruding toward the second plate 11, the first boss 16 being located in the first distribution area 8; the first boss 16 has a first welding plate portion 17 extending along a first direction X; the first welding plate portion 17 has at least one first through hole 31, and at least a portion of the first welding plate portion 17 is welded to the second plate 11; before welding, the first plate 10 and the second plate 11 are alternately arranged to form a welding core, at which time the first plate 10 and the second plate 11 are not welded; during welding, the first plate 10 is located below the second plate 11, and the first welding plate portion 17 of the first plate 10 has the first through hole 31. The first boss 16 of the first plate 10 has the first welding plate portion 17, and the first welding plate portion 17 is welded to the second plate 11. Because the first welding plate portion 17 has the first through hole 31 structure, thermal collapse of the first welding plate portion 17 during welding can be reduced. In addition, the first welded plate portion 17 has a first through hole 31, which can improve the material thinning during the stamping process and improve the feasibility of stamping manufacturing of the plate.
[0029] In this embodiment, as shown in Figures 3 and 4, the first welding plate portion 17 has at least two first through holes 31, and a first sub-welding plate portion 14 is provided between two adjacent first through holes 31. The first sub-welding plate portion 14 is welded to the second plate 11. If the area of the through hole is large, it will affect the welding strength at the through hole. Thus, having a first sub-welding plate portion 14 between two adjacent first through holes 31 can improve the welding strength of the first boss 16 located at the first sub-welding plate portion 14.
[0030] As shown in Figures 3-7, the first plate 10 also has a second boss 18 protruding towards the second plate 11. The second boss 18 is located in the first distribution area 8 and is located radially outside the first corner hole 12. The second boss 18 has a first end 19 and a second end 20, and a first opening 21 is provided between the first end 19 and the second end 20. The first opening 21 faces the inter-plate channel 5 and connects the first corner hole 12 and the inter-plate channel 5. The second boss 18 has a second welding plate portion 22, which extends along the circumferential direction of the first corner hole 12, and the extension path of the second welding plate portion 22 is approximately "C"-shaped. The first corner hole 12 is connected to the inter-plate channel 5. The second welding plate portion 22 has at least one second through hole 35, and at least part of the second welding plate portion 22 is welded to the second plate 11. During welding, the first plate 10 is located below the second plate 11, and the second welding plate portion 22 of the first plate 10 has the second through hole 35. The second boss 18 of the first plate 10 has a second welding plate portion 22, which is welded to the second plate 11. Since the second welding plate portion 22 has a second through-hole 35 structure, thermal collapse of the second welding plate portion 22 during welding can be reduced. After welding, the second through-hole 35 on the second welding plate portion 22 is sealed by the second plate 11. Furthermore, the second through-hole 35 in the second welding plate portion 22 can improve material thinning during the stamping process, increasing the feasibility of stamping manufacturing of the plate.
[0031] In addition, the first boss 16 and the second boss 18 are both located in the first distribution area 8. The first welding plate portion 17 of the first boss 16 extends along the first direction X and is welded to the second plate 11. The second welding plate portion 22 extends along the circumferential direction of the first corner hole 12 and is welded to the second plate 11. This increases the welding area of the first plate 10 and the second plate 11 in the first distribution area 8, thereby improving the pressure resistance and internal corrosion resistance of the heat exchanger 1.
[0032] As shown in Figure 4, the second welding plate portion 22 has a second sub-welding plate portion 32, which extends in a direction away from the first corner hole 12 and has a second through hole 35. Thus, the provision of the second through hole 35 can reduce the thermal collapse of the first sub-welding plate portion 32. In addition, the provision of the second welding plate portion 22 increases the welding area between the second welding plate portion 22 and the second plate 11, thereby further improving the product's compressive strength and internal corrosion resistance.
[0033] As shown in Figure 3, the first plate 10 also has a first flange 41; the wall forming the second boss 18 includes part of the first flange 41; thus, the first flange 41 constitutes both the flange structure of the first plate 10 and the wall structure of the second boss 18, making it easy to manufacture and improve the manufacturability of the plate.
[0034] In this embodiment, as shown in Figures 3, 8, 9, and 10, the second plate 11 further has a third protrusion 23 protruding toward the first plate 10, and the third protrusion 23 is located in the first distribution area 8; the third protrusion 23 has a third welding plate portion 24, which extends along the first direction X, and is welded to the first welding plate portion 17, as shown in Figure 3. After welding, the third protrusion 23 can cover the first through hole 31 on the first protrusion 16; for ease of understanding and explanation, along the stacking direction of the plates, the distance between the first plate 10 and the second plate 11 forming the inter-plate channel 5 is defined as H1, and this distance is denoted as H1. The distance is the plate spacing; the second plate 11 has a third boss 23, and the third welding plate portion 24 of the third boss 23 is welded to the first welding plate portion 17. In this way, on the one hand, with the spacing H1 unchanged, the second plate 11 has a third boss 23 that cooperates with the first boss 16 of the first plate 10, which can reduce the height of the first boss 16 protruding from the substrate of the first plate 10, making the plate easier to manufacture and improve the manufacturability of the plate; on the other hand, the plate spacing of the plate channel 5 formed by stamping a single plate boss is limited. By stamping the first boss 16 and the third boss 23 at the same time, the plate spacing of the plate channel 5 can be increased.
[0035] As shown in Figures 3-7, the second plate 11 also has a third corner hole 25; the second plate 11 also has a fourth boss 26 protruding towards the first plate 10, the fourth boss 26 is located in the first distribution area 8, and the fourth boss 26 is located radially outside the third corner hole 25; the fourth boss 26 has a third end 27 and a fourth end 28, and a second opening 29 is provided between the third end 27 and the fourth end 28, the second opening 29 faces the inter-plate channel 5, and the second opening 29 connects the third corner hole 25 and the inter-plate channel 5; the fourth boss 26 has a fourth welding plate portion 30, the fourth welding plate portion 30 extends along the circumferential direction of the third corner hole 25, and the extension path of the fourth welding plate portion 30 is approximately "C" shaped; the third corner hole 25 is connected to the inter-plate channel 5; the fourth welding plate portion 30 is welded to the second welding plate portion 22. For ease of understanding and explanation, the distance between the first plate 10 and the second plate 11 forming the inter-plate channel 5 is defined as H1 along the stacking direction of the plates. The fourth welding plate portion 30 of the second plate 11 is welded to the second welding plate portion 22. Thus, on the one hand, with the distance H1 remaining unchanged, the second plate 11 has a fourth boss 26 that cooperates with the second boss 18 of the first plate 10, which can reduce the height of the second boss 18 protruding from the substrate of the second plate 11, making the plate easier to manufacture and improving the manufacturability of the plate. On the other hand, the plate spacing of the inter-plate channel 5 formed by stamping a boss on a single plate is limited. By stamping the second boss 18 and the fourth boss 26 simultaneously, the plate spacing of the inter-plate channel 5 can be increased.
[0036] As shown in Figures 3 and 8, the fourth welding plate portion 30 has a third sub-welding plate portion 33, which extends in a direction away from the third corner hole 25. The second sub-welding plate portion 32 is welded to the third sub-welding plate portion 33. Welding the second sub-welding plate portion 32 and the third sub-welding plate portion 33 increases the welding area between the second welding plate portion 22 and the fourth welding plate portion 30, thereby further improving the product's pressure resistance and internal corrosion resistance.
[0037] As shown in Figure 3, the second plate 11 also has a second flange 43; the wall forming the fourth boss 26 includes a portion of the second flange 43. Thus, the second flange 43 constitutes both the flange structure of the second plate 11 and the wall structure of the fourth boss 26, making it easy to manufacture and improving the manufacturability of the plate.
[0038] It should be noted that, in the above technical solution, for example, the second corner hole 13 can be disposed on the first boss 16, and the fourth corner hole 45 can be disposed on the third boss 23; alternatively, the second corner hole 13 can be disposed independently of the first boss 16, and the fourth corner hole 45 can be disposed independently of the third boss 23. Specifically, as follows:
[0039] In some embodiments, the first plate 10 has a first corner boss located in the first distribution area 8, the first corner boss having a second corner hole 13, and a first boss 16 spaced apart from the first corner boss. The second plate 11 also has a second corner boss located in the first distribution area 8, the second corner boss having a fourth corner hole 45, and a third boss 23 spaced apart from the second corner boss.
[0040] In other embodiments, as shown in Figures 2-4, the first welding plate portion 1 of the first boss 16 has a second corner hole 13, and the third welding plate portion 24 of the third boss 23 has a fourth corner hole 45, with the second corner hole 13 and the fourth corner hole 45 communicating with each other. Thus, the second corner hole 13 is located on the first boss 16, and the fourth corner hole 45 is located on the third boss 23, which reduces the number of bosses to be stamped, facilitates forming, and further improves the manufacturability of the plates. Furthermore, compared to the above-described two-bore structure, the welding area of both the first plate 10 and the second plate 11 can be further increased. Additionally, the first welding plate portion 17 is provided with a first through hole 31 structure, which can reduce leakage caused by the thermal collapse of the first boss 16; the second welding plate portion 22 is provided with a second through hole 35 structure, with the same technical effect.
[0041] In this embodiment, as shown in Figures 2, 3, 9, 10, 11, and 12, the plates forming the inter-plate flow channel 6 include a first plate 10 and another second plate 11 adjacent to it. For ease of understanding and explanation, the second plate 11 is defined as a heat exchange plate 15, also referred to as a third plate. The first plate 10 also has a fifth boss 36 protruding toward the third plate 15. The fifth boss 36 is located in the first distribution area 8. The fifth boss 36 has a fifth welding plate portion 37, which extends along the first direction X and has a first corner hole 12. The fifth welding plate portion 37 is welded to the third plate 15. Thus, in the interplate flow channel 6, the fifth boss 36 is located in the first distribution area 8, the fifth welding plate portion 37 of the fifth boss 36 extends along the first direction X, and the fifth welding plate portion 37 is welded to the third plate 15, which increases the welding area of the first plate 10 and the third plate 15 in the first distribution area 8, and improves the pressure resistance and internal corrosion resistance of the heat exchanger 1.
[0042] As shown in Figure 11, the third plate 15 has a sixth boss 38 protruding towards the first plate 10, and the sixth boss 38 is located in the first distribution area 8; the sixth boss 38 has a sixth welding plate portion 39, which extends along the first direction X, and the sixth welding plate portion 39 has a third corner hole 25; the fifth welding plate portion 37 is welded to the sixth welding plate portion 39. For ease of understanding and explanation, the distance between the first plate 10 and the third plate 15 forming the inter-plate flow channel 6 is defined as H2 along the plate stacking direction; thus, with the distance H2 unchanged, the third plate 15 has a sixth boss 38 that cooperates with the first plate 10, which can reduce the height of the fifth boss 36 protruding from the substrate of the first plate 10, making it easier to form and improving the manufacturability of the plate; on the other hand, the plate spacing of the inter-plate flow channel 6 formed by stamping a single plate boss is limited, and the plate spacing of the inter-plate flow channel 6 can be increased by stamping the fifth boss 36 and the sixth boss 38 at the same time.
[0043] As shown in Figure 11, the fifth welded plate portion 37 has a third through hole 40. Thus, on the one hand, the fifth welded plate portion 37 and the sixth welded plate portion 39 are closely fitted together. The third through hole 40 in the fifth welded plate portion 37 can reduce thermal collapse of the fifth welded plate portion 37, thereby reducing leakage between the fifth welded plate portion 37 and the sixth welded plate portion 39. After welding, the sixth welded plate portion 39 can seal the third through hole 40 of the fifth welded plate portion 37. On the other hand, the third through hole 40 in the fifth welded plate portion 37 can improve material thinning during the stamping process and improve the feasibility of stamping manufacturing of the plate.
[0044] As shown in Figure 3, the wall forming the second boss 18 includes a first sidewall 47 and a portion of a first flange 41, and the wall forming the fifth boss 36 includes a portion of the first sidewall 47. Thus, the first sidewall 47 constitutes both the wall structure of the second boss 18 and the wall structure of the fifth boss 36, facilitating manufacturing and improving the manufacturability of the sheet. The wall forming the fourth boss 26 includes a second sidewall 44 and a portion of a second flange 43, and the wall forming the sixth boss 38 includes a portion of the second sidewall 44. Thus, the second sidewall 44 constitutes both the wall structure of the fourth boss 26 and the wall structure of the sixth boss 38, facilitating manufacturing and improving the manufacturability of the sheet.
[0045] In other embodiments, the second distribution area of the heat exchange plate 7 has the same boss structure as the first distribution area, and the technical effect is the same.
[0046] Example 2: The main difference between this example and Example 1 lies in the boss structure of the distribution area, as shown below:
[0047] As shown in Figures 13-14, the heat exchanger includes stacked heat transfer plates 50. The heat transfer plates 50 have a first fluid distribution area 51, a heat exchange area, and a second fluid distribution area 52. The heat transfer plates 50 include a first flow channel plate 53 and a second flow channel plate 54, which are arranged alternately. The first flow channel plate 53 has a first flow hole 55 and a second flow hole 56. The direction of the line connecting the center of the first flow hole 55 and the center of the second flow hole 56 is defined as the second direction Y. The first flow channel plate 53 has a first protrusion 57 protruding toward the second flow channel plate 54. The first protrusion 57 is located in the first fluid distribution area 51. The first protrusion 57 has a first welding substrate portion 59, which extends along the second direction Y and is located between the first flow hole 55 and the second flow hole 56. The first welding substrate portion 59 is welded to the first flow channel plate 53 and has at least one fourth through hole 60. Before welding, the first flow channel plate 53 and the second flow channel plate 54 are alternately arranged to form a welding core. At this time, the first flow channel plate 53 and the second flow channel plate 54 are not welded. During welding, the first flow channel plate 53 is located below the second flow channel plate 54, and the first welding substrate portion 59 of the first flow channel plate 53 has the fourth through hole 60. The first protrusion 57 of the first flow channel plate 53 has the first welding substrate portion 59, which is welded to the second flow channel plate 54. Since the first welding substrate portion 59 has the fourth through hole 60 structure, thermal collapse of the first welding substrate portion 59 during welding can be reduced. Furthermore, the first welding substrate portion 59 has a fourth through hole 60, which can improve material thinning during the stamping process and enhance the feasibility of stamping manufacturing of the sheet. In addition, the first protrusion 57 is located in the first fluid distribution area 51, and the first welding substrate portion 59 of the first protrusion 57 extends along the second direction Y and is welded to the first flow channel plate 53, which increases the welding area of the first flow channel plate 53 and the second flow channel plate 54 in the first fluid distribution area 51, thereby improving the pressure resistance and internal corrosion resistance of the heat exchanger 49.
[0048] In this embodiment, as shown in FIG14, the second flow channel plate 54 has a second protrusion 61 protruding toward the first flow channel plate 53, and the second protrusion 61 is located in the first fluid distribution area 51; the second protrusion 61 has a second welding substrate portion 62, which extends along the second direction Y; the second flow channel plate 54 has a third flow hole 63 and a fourth flow hole 64, and the second welding substrate portion 62 is located between the third flow hole 63 and the fourth flow hole 64; the first welding substrate portion 59 is welded to the second welding substrate portion 62. Thus, on the one hand, along the stacking direction of the plates, the distance between the first flow channel plate 53 and the second flow channel plate 54 forming the inter-plate channel is h1; with the distance h1 remaining unchanged, the second flow channel plate 54 has a second protrusion 61 that cooperates with the first flow channel plate 53, which can reduce the height of the first protrusion 57 protruding from the substrate of the first flow channel plate 53, and reduce the height of the second protrusion 61 protruding from the substrate of the first flow channel plate 53, making it easier to manufacture and improve the manufacturability of the plates; on the other hand, the height of the inter-plate channel spacing can be increased.
[0049] In other embodiments, the second fluid distribution area 52 of the heat transfer plate 50 has the same boss structure as the first fluid distribution area 51, and the technical effect is the same.
[0050] The above-described embodiments are merely examples of several implementations of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications without departing from the concept of this utility model, and these modifications all fall within the protection scope of this utility model.
Claims
1. A heat exchanger, characterized by It includes stacked heat exchange plates (7), the heat exchange plates (7) including a first plate (10) and a second plate (11); The first plate (10) has a first boss (16) protruding toward the second plate (11), the first boss (16) has a first welding plate portion (17); the first welding plate portion (17) has at least one first through hole (31), and at least part of the first welding plate portion (17) is welded to the second plate (11).
2. The heat exchanger according to claim 1, characterized in that, The first welding plate portion (17) has at least two first through holes (31), and a first sub-welding plate portion (14) is provided between two adjacent first through holes (31), and the first sub-welding plate portion (14) is welded to the second plate (11).
3. The heat exchanger according to claim 1 or 2, characterized in that, The first plate (10) has a first corner hole (12); the first plate (10) also has a second boss (18) protruding toward the second plate (11), the second boss (18) being located radially outside the first corner hole (12); The second boss (18) has a second welding plate portion (22), the second welding plate portion (22) has at least one second through hole (35), and at least part of the second welding plate portion (22) is welded to the second plate (11).
4. The heat exchanger according to claim 3, characterized in that, The second boss (18) has a first end (19) and a second end (20), and a first opening (21) is provided between the first end (19) and the second end (20). The first opening (21) faces the inter-plate channel (5) and the first opening (21) connects the first corner hole (12) and the inter-plate channel (5).
5. The heat exchanger according to claim 4, characterized in that, The second welding plate portion (22) has a second sub-welding plate portion (32), which extends toward the direction away from the first corner hole (12) and has a second through hole (35).
6. The heat exchanger according to claim 5, characterized in that, The first plate (10) also has a first flange (41); the wall forming the second boss (18) includes a portion of the first flange (41).
7. The heat exchanger according to claim 6, characterized in that, The second plate (11) has a third boss (23) protruding toward the first plate (10); the third boss (23) has a third welding plate portion (24), at least part of the first welding plate portion (17) is welded to the third welding plate portion (24).
8. The heat exchanger according to claim 7, characterized in that, The second plate (11) has a third corner hole (25); the second plate (11) also has a fourth boss (26) protruding toward the first plate (10), the fourth boss (26) being located radially outside the third corner hole (25); The fourth boss (26) has a fourth welding plate portion (30), and at least a portion of the second welding plate portion (22) is welded to the fourth welding plate portion (30).
9. The heat exchanger according to claim 8, characterized in that, The fourth welding plate portion (30) has a third sub-welding plate portion (33) which extends toward the direction away from the third corner hole (25), and the second sub-welding plate portion (32) is welded to the third sub-welding plate portion (33).
10. The heat exchanger according to claim 9, characterized in that, The second plate (11) also has a second flange (43); the wall forming the fourth boss (26) includes a portion of the second flange (43).
11. The heat exchanger according to claim 9 or 10, characterized in that, The heat exchanger (1) has an interplate flow channel (6); the first plate (10) has a second corner hole (13), the second corner hole (13) is located in the first welded plate portion (17), and the second corner hole (13) communicates with the interplate flow channel (6); and / or, the second plate (11) has a fourth corner hole (45), the fourth corner hole (45) is located in the third welded plate portion (24), and the fourth corner hole (45) communicates with the interplate flow channel (6).
12. The heat exchanger according to claim 11, characterized in that, The heat exchange plate (7) includes a third plate (15), the second plate (11) is on one side of the first plate (10), and the third plate (15) is on the other side of the first plate (10); The first plate (10) has a fifth boss (36) protruding toward the third plate (15), the fifth boss (36) being located in the first distribution area (8); the fifth boss (36) has a fifth welding plate portion (37), the fifth welding plate portion (37) being welded to the third plate (15), and the fifth welding plate portion (37) having the first corner hole (12).
13. The heat exchanger according to claim 12, characterized in that, The wall forming the second boss (18) includes the first sidewall (47) and a portion of the first flange (41), and the wall forming the fifth boss (36) includes a portion of the first sidewall (47).
14. The heat exchanger according to claim 13, characterized in that, The third plate (15) has a sixth boss (38) protruding toward the first plate (10), the sixth boss (38) being located in the first distribution area (8); the sixth boss (38) has a sixth welding plate portion (39), the sixth welding plate portion (39) having the third corner hole (25); the fifth welding plate portion (37) is welded to the sixth welding plate portion (39).
15. The heat exchanger according to claim 14, characterized in that, The wall forming the fourth boss (26) includes the second sidewall (44) and a portion of the second flange (43), and the wall forming the sixth boss (38) includes a portion of the second sidewall (44).