Heat exchanger

Abstract

The utility model relates to a heat exchanger which comprises a connecting piece and a flow collecting piece, and the connecting piece is provided with a first flow channel and at least two first communicating holes; the flow collecting piece is provided with at least one first hole channel. The first communicating hole communicates with the first flow channel and the first hole channel. At least one first reinforcing part is further fixed or integrally formed on the connecting piece, every two adjacent first communicating holes are located in the two sides of the corresponding first reinforcing part respectively, and at least part of the first reinforcing parts are fixedly connected with the flow collecting piece. The first communication hole area of the connecting piece is provided with the first reinforcing part, the first reinforcing part is welded to the flow collecting piece, the welding area, located at the first communication hole, of the connecting piece can be increased, the welding strength is improved, and then the pressure bursting strength of the heat exchanger can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to heat management technical field especially relates to a heat exchanger for refrigerating system. BACKGROUND

[0002] The heat exchanger, also called heat exchange, is widely used in heat exchange system. In the related art, the heat exchanger comprises a connecting piece, a flow collecting piece and a core body, fluid enters the core body through the connecting piece and the flow collecting piece, and heat exchange is carried out in the core body; the connecting piece has a flow-through hole, and the fluid enters the hole of the flow collecting piece through the flow-through hole; the connecting piece and the flow collecting piece are fixedly connected by welding, and there is no welding spot in the flow-through hole area, so that the pressure-bearing capacity of the flow-through hole area is relatively weak. SUMMARY

[0003] Therefore, it is necessary to provide a heat exchanger aiming at the above problems, to improve the pressure explosion strength of the flow-through hole area of the connecting piece.

[0004] The technical scheme adopted by the utility model is as follows:

[0005] A heat exchanger comprises a connecting piece and a flow collecting piece, the connecting piece has a first flow channel and at least two first communication holes; the flow collecting piece has at least one first hole, the first communication hole connects the first flow channel and the first hole; the connecting piece further has at least one first reinforcing part, the two adjacent first communication holes are located on the two sides of the first reinforcing part respectively, and at least part of the first reinforcing part is fixedly connected with the flow collecting piece.

[0006] The first communication hole area of the connecting piece of the technical scheme has a first reinforcing part, the first reinforcing part is welded with the flow collecting piece, the welding area of the connecting piece at the first communication hole can be increased, the welding strength is increased, and then the pressure explosion strength of the heat exchanger can be improved.

[0007] The heat exchanger comprises a connecting piece and a flow collecting piece, the connecting piece has a first flow channel and at least one first flow-through hole; the flow collecting piece has at least one first hole, the first communication hole connects the first flow channel and the first hole; the connecting piece further has at least one first reinforcing part, the first reinforcing part is located in the first flow-through hole, one end of the first reinforcing part is fixedly connected with the wall forming the first flow-through hole or is an integral structure, the other end of the first reinforcing part is fixedly connected with the wall forming the first flow-through hole or is an integral structure, and at least part of the first reinforcing part is welded with the flow collecting piece.

[0008] The first flow-through hole region of the connecting piece of the technical scheme has a first reinforcing part, which is welded with the current collector, so that the welding area of the connecting piece at the first flow-through hole is increased, the welding strength is increased, and the pressure explosion strength of the heat exchanger is improved. BRIEF DESCRIPTION OF DRAWINGS

[0009] Figure 1 It is a structural schematic view of the heat exchanger of the utility model;

[0010] Figure 2 It is Figure 1 an explosion schematic view;

[0011] Figure 3 It is Figure 2 an explosion schematic view of the heat exchange core in

[0012] Figure 4 It is Figure 2 a structural schematic view of the connecting piece and the current collector in

[0013] Figure 5 It is Figure 4 a structural schematic view of the first embodiment of the connecting piece in

[0014] Figure 6 It is Figure 4 a structural schematic view of the second embodiment of the connecting piece in

[0015] Figure 7 It is Figure 2 a structural schematic view of the flow-through plate in

[0016] Figure 8 It is Figure 5 a structural schematic view of another angle of

[0017] Figure 9 It is Figure 8 a sectional view schematic view along the A-A direction in

[0018] Figure 10 It is Figure 4 a structural schematic view of the third embodiment of the connecting piece in

[0019] Figure 11 It is Figure 4 a structural schematic view of the fourth embodiment of the connecting piece in

[0020] Figure 12 It is Figure 11 a structural schematic view of another angle of

[0021] Figure 13 It is Figure 12 a sectional view schematic view along the C-C direction in

[0022] Figure 14 for Figure 4 A schematic diagram of the fifth embodiment of the connecting member;

[0023] Figure 15 for Figure 8 A cross-sectional view along the BB direction;

[0024] Figure 16 for Figure 12 A cross-sectional view along the DD direction.

[0025] Reference numerals: 1. Heat exchanger; 2. Shell; 3. Heat exchange core; 4. Cover plate; 5. Connector; 6. Manifold; 7. First heat exchange tube; 8. First flow channel; 9. First connecting hole; 10. Flow plate; 11. Connecting plate; 12. First channel; 13. First mounting groove; 14. First reinforcing part; 15. First crossbeam; 16. Second reinforcing part; 17. First sub-reinforcing part; 18. Second sub-reinforcing part; 19. Inlet; 20. First through hole; 21. Second through hole; 22. Second flow channel; 23. Second connecting hole; 24. Second heat exchange tube; 26. Second mounting groove; 27. Third reinforcing part; 28. Second crossbeam; 29. ​​Fourth reinforcing part; 30. Third sub-reinforcing part; 31. Fourth sub-reinforcing part; 32. Outlet; 33. Third through hole; 34. Fourth through hole; 35. Second channel; 36. First flow hole; 37. Second flow hole. Detailed Implementation

[0026] 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 the utility model and are not intended to limit the scope of the utility model.

[0027] like Figures 1-3 As shown, the heat exchanger 1 includes a shell 2, a heat exchange core 3, and a cover plate 4; the heat exchange core 3 includes a connector 5, a manifold 6, and at least one first heat exchange tube 7. The connector 5 is provided on one side of the manifold 6, and the first heat exchange tube 7 is provided on the other side of the manifold 6; when the heat exchange core 3 includes two or more first heat exchange tubes 7, the two or more first heat exchange tubes 7 are stacked, and the first heat exchange tube 7 has a fluid channel inside; for example... Figures 4-9As shown, the connecting piece 5 has a first flow channel 8 and at least two first communication holes 9, the current collector 6 includes at least one flow-through plate 10 and a connecting plate 11, the flow-through plate 10 has at least one first hole channel 12, when the flow-through plate 10 has two or more first hole channels 12, the two or more first hole channels 12 are spaced apart along the stacking direction of the first heat exchange pipe 7, the first communication hole 9 communicates the first flow channel 8 and the first hole channel 12; the connecting plate 11 is provided with at least one first mounting groove 13, when the connecting plate 11 is provided with two or more first mounting grooves 13, the two or more first mounting grooves 13 are spaced apart along the stacking direction of the first heat exchange pipe 7; one end of the first heat exchange pipe 7 close to the current collector 6 is arranged in the first mounting groove 13, and the first hole channel 12 of the flow-through plate 10 is in communication with the fluid passage of the first heat exchange pipe 7; the fluid enters the fluid passage of the first heat exchange pipe 7 through the first flow channel 8, the first communication hole 9 and the first hole channel 12, and heat exchange is realized through the first heat exchange pipe 7; the connecting piece 5 is further fixed or integrally formed with at least one first reinforcing part 14, the two adjacent first communication holes 9 are respectively located on the two sides of the first reinforcing part 14, and at least part of the first reinforcing part 14 is fixedly connected with the current collector 6; wherein the fixed connection includes welding; in this way, the first communication hole 9 area of the connecting piece 5 has the first reinforcing part 14, the first reinforcing part 14 is welded with the current collector 6, which can increase the welding area of the connecting piece 5 at the first communication hole 9, increase the welding strength, and further improve the pressure explosion strength of the heat exchanger 1.

[0028] The above technical solution can also be understood as follows: the heat exchanger 1 includes a connecting piece 5 and a current collector 6, the connecting piece 5 has a first flow channel 8 and at least one first flow-through hole 36, wherein the first flow-through hole 36 includes at least two first communication holes 9; the current collector 6 has at least one first hole channel 12, the first flow-through hole 36 communicates the first flow channel 8 and the first hole channel 12; the connecting piece 5 further has at least one first reinforcing part 14, the first reinforcing part 14 is located at the first communication hole 9, one end of the first reinforcing part 14 is fixedly connected with the wall forming the first flow-through hole 36 or is an integral structure, the other end of the first reinforcing part 14 is fixedly connected with the wall forming the first flow-through hole 36 or is an integral structure, and at least part of the first reinforcing part 14 is welded with the current collector 6. The first flow-through hole 36 area of the connecting piece 5 has the first reinforcing part 14, the first reinforcing part 14 is welded with the current collector 6, which can increase the welding area of the connecting piece 5 at the first flow-through hole 36, increase the welding strength, and further improve the pressure explosion strength of the heat exchanger 1.

[0029] It should be noted that, as shown in Figure 5 The first reinforcing part 14 can be a continuous structure; of course, as shown in Figures 6 The first reinforcing part 14 can also be a non-continuous structure, such as the first reinforcing part 14 includes a first welding part and a second welding part, and the first welding part and the second welding part have a gap therebetween.

[0030] As shown in Figures 7-9 the embodiment, the flow plate 10 has at least one first beam 15 and at least two first channels 12, and two adjacent first channels 12 are respectively located on the two sides of the first beam 15. As for the welding position of the first reinforcing part 14 and the current collecting piece 6, a third welding part can be additionally arranged at the position of the first channel 12 of the flow plate 10, and the first reinforcing part 14 is welded with the third welding part. Of course, the first reinforcing part 14 can also be directly fixedly connected with the first beam 15, so that the welding of the first reinforcing part 14 and the flow plate 10 can be realized without structural improvement of the flow plate 10, thereby reducing the processing cost. In order to increase the welding strength of the connecting piece 5 and the flow plate 10 and improve the pressure explosion resistance strength at the first communication hole 9, the connecting piece 5 can be provided with a plurality of first reinforcing parts 14, and correspondingly, the flow plate 10 is provided with a plurality of first beams 15, and each first reinforcing part 14 is welded with the first beam 15.

[0031] As shown in Figures 8-9 , a plane parallel to the flow plate 10 is defined as a projection plane, the first projection of the first reinforcing part 14 in the projection plane is a first projection, and the second projection of the first beam 15 in the projection plane is a second projection, and the first projection is located in the second projection. Part of the first projection is located in the second projection, that is, part of the first reinforcing part 14 is welded with the first beam 15, and the other part of the first reinforcing part 14 will block the first channel 12, so that the flow cross-sectional area of the first channel 12 will be reduced, which will affect the fluid distribution. The first projection is located in the second projection, so that the welding area of the first reinforcing part 14 and the first beam 15 can be increased, thereby increasing the welding strength of the first reinforcing part 14 and the first beam 15.

[0032] As shown in Figures 10-13 , the connecting piece 5 also has at least one second reinforcing part 16, the extension direction of the second reinforcing part 16 intersects with the extension direction of the first reinforcing part 14, the extension direction of the first reinforcing part 14 is the same as the extension direction of the first beam 15, the extension direction of the second reinforcing part 16 intersects with the extension direction of the first beam 15, and at least part of the second reinforcing part 16 is fixedly connected with the first beam 15. In this way, the welding area of the connecting piece 5 and the flow plate 10 can be further increased, the welding strength can be increased, and the pressure explosion resistance strength of the heat exchanger 1 can be further improved. Of course, the connecting piece 5 can also be provided with a plurality of second reinforcing parts 16, and each second reinforcing part 16 is fixedly connected with the first beam 15. It should be noted that the number of second reinforcing parts 16 should not be too much, otherwise the flow cross-sectional area of the first communication hole 9 will be reduced, which will affect the fluid distribution.

[0033] In more detail, as shown in Figure 10 , the second reinforcing part 16 is located on one side of the first reinforcing part 14; or, as shown in Figures 11-13As shown, the second reinforcing portion 16 includes a first sub-reinforcing portion 17 and a second sub-reinforcing portion 18, which are respectively located on both sides of the first reinforcing portion 14; in this way, the welding points are more uniform, and the welding strength is higher.

[0034] It should be noted that the connecting piece 5 has at least two first communication holes 9, the closer the first communication hole 9 to the inlet 19, the smaller the water resistance, and vice versa, the farther the first communication hole 9 from the inlet 19, the greater the water resistance, and the difference in water resistance will cause uneven distribution of fluid. As shown in Figure 14 As shown, the first flow channel 8 includes an inlet 19, and the at least two first communication holes 9 include a first communication hole 20 and a second communication hole 21, the first communication hole 20 is closer to the inlet 19 than the second communication hole 21, and the flow area of the second communication hole 21 is greater than that of the first communication hole 20. So that the water resistance of the fluid in the first communication hole 20 is greater than that in the second communication hole 21, thereby balancing the water resistance of the fluid entering the first communication hole 20 and the fluid entering the second communication hole 21, so that the distribution of the fluid is more uniform.

[0035] As shown in Figure 5 In other embodiments, the connecting piece 5 also has a second flow channel 22 and at least two second communication holes 23; the fluid enters the first flow channel 8 through the inlet 19, then enters the heat exchange core 3; after flowing out of the heat exchange core 3, it enters the second flow channel 22 of the connecting piece 5 again. Similarly, the pressure-bearing capacity of the second communication hole 23 area of the connecting piece 5 is relatively weak, and the welding area of this area needs to be improved to improve the pressure resistance and blasting strength.

[0036] In more detail, as shown in Figure 3 The heat exchange core 3 also includes at least one second heat exchange pipe 24, which is in communication with the first heat exchange pipe 7; when the heat exchange core 3 has two or more second heat exchange pipes 24, the two or more second heat exchange pipes 24 are arranged in a stacked manner, and the second heat exchange pipe 24 has a fluid passage inside; as shown in Figure 4 and Figure 7 The flow-through plate 10 has at least one second hole 35, and when the flow-through plate 10 has two or more second holes 35, the two or more second holes 35 are arranged in a spaced manner along the stacking direction of the second heat exchange pipe 24, and the second communication hole 23 communicates the second flow channel 22 with the second hole 35; the connecting plate 11 has at least one second mounting groove 26, and when the connecting plate 11 has two or more second mounting grooves 26, the two or more second mounting grooves 26 are arranged in a spaced manner along the stacking direction of the heat exchange pipe; one end of the second heat exchange pipe 24 close to the current collector 6 is arranged in the second mounting groove 26, and the second hole 35 of the flow-through plate 10 is in communication with the fluid passage of the second heat exchange pipe 24; as shown in Figure 8 、 Figure 10 、 Figure 11 and Figure 15As shown, the connecting piece 5 is further fixed or integrally formed with at least one third reinforcing portion 27, two adjacent second communication holes 23 are respectively located on two sides of the third reinforcing portion 27, and at least part of the third reinforcing portion 27 is fixedly connected with the current collecting piece 6. The fixed connection includes welding. In this way, the second communication hole 23 area of the connecting piece 5 has the third reinforcing portion 27, the third reinforcing portion 27 is welded with the current collecting piece 6, the welding area of the connecting piece 5 at the second communication hole 23 is increased, the welding strength is increased, and then the pressure explosion strength of the heat exchanger 1 can be improved. Similarly, as shown in Figure 5 The third reinforcing portion 27 can be a continuous structure, of course, as shown in Figure 6 The third reinforcing portion 27 can also be a non-continuous structure.

[0037] The above technical solution can also be understood as follows: the connecting piece 5 further has a second flow channel 22 and at least one second flow communication hole 37, the second flow communication hole 37 includes at least two second communication holes 23; the current collecting piece 6 has at least one second hole channel 35, the second flow communication hole 37 communicates the second flow channel 22 and the second hole channel 35; the connecting piece further has at least one third reinforcing portion 27, the third reinforcing portion 27 is located at the second flow communication hole 37, one end of the third reinforcing portion 27 is fixedly connected with the wall forming the second flow communication hole 37 or is an integral structure, the other end of the third reinforcing portion 27 is fixedly connected with the wall forming the second flow communication hole 37 or is an integral structure, and at least part of the third reinforcing portion 27 is welded with the current collecting piece 6. The second flow communication hole 37 area of the connecting piece 5 has the third reinforcing portion 27, the third reinforcing portion 27 is welded with the current collecting piece 6, the welding area of the connecting piece 5 at the second flow communication hole 37 is increased, the welding strength is increased, and then the pressure explosion strength of the heat exchanger 1 can be improved.

[0038] As shown in Figure 7 and Figure 15 In the embodiment, the flow-through plate 10 has at least one second cross beam 28 and at least two second hole channels 35, two adjacent second hole channels 35 are respectively located on two sides of the second cross beam 28; the third reinforcing portion 27 is fixedly connected with the second cross beam 28. As for the welding position of the third reinforcing portion 27 and the current collecting piece 6, a sixth welding portion can be additionally arranged at the second hole channel 35 of the current collecting piece 6, and the third reinforcing portion 27 is welded with the sixth welding portion; of course, the third reinforcing portion 27 can also be directly fixedly connected with the second cross beam 28, in this way, the welding of the third reinforcing portion 27 and the current collecting piece 6 can be realized without improving the structure of the flow-through plate 10. In order to increase the welding strength of the connecting piece 5 and the flow-through plate 10 and improve the pressure explosion strength at the second communication hole 23, the connecting piece 5 can be provided with multiple third reinforcing portions 27, and correspondingly, the flow-through plate 10 is provided with multiple second cross beams 28, and each third reinforcing portion 27 is welded with the second cross beam 28.

[0039] As shown in Figure 15As shown in FIG. 1, the third reinforcing portion 27 is in a third projection on the front projection of the projection surface, and the second cross beam 28 is in a fourth projection on the front projection of the projection surface, and the third projection is located within the fourth projection. A part of the third reinforcing portion 27 is welded with the second cross beam 28, and another part of the third reinforcing portion 27 will block the second channel 35, so that the flow area of the second channel 35 is reduced, and the fluid distribution is affected. The third projection is located within the fourth projection, so that the welding area of the third reinforcing portion 27 and the second cross beam 28 is increased, thereby increasing the welding strength of the third reinforcing portion 27 and the second cross beam 28.

[0040] As shown in FIG. 1, Figure 10 , Figure 11 , Figure 12 and Figure 16 , the connecting piece 5 further has at least one fourth reinforcing portion 29, the extension direction of the fourth reinforcing portion 29 intersects with the extension direction of the third reinforcing portion 27, and the extension direction of the third reinforcing portion 27 is the same as the extension direction of the second cross beam 28, the extension direction of the fourth reinforcing portion 29 intersects with the extension direction of the second cross beam 28, and at least part of the fourth reinforcing portion 29 is fixedly connected with the second cross beam 28. In this way, the welding strength of the connecting piece 5 and the flow-through plate 10 can be further increased, and the pressure explosion strength of the heat exchanger 1 can be further improved. Of course, the connecting piece 5 can also be provided with a plurality of fourth reinforcing portions 29, and each fourth reinforcing portion 29 is fixedly connected with the second cross beam 28. It should be noted that the number of fourth reinforcing portions 29 should not be too much, otherwise the flow area of the second communication hole 23 will be reduced, and the distribution of the fluid will be affected.

[0041] More specifically, as shown in FIG. 1, Figure 10 , Figure 11 , Figure 12 and Figure 16 , the fourth reinforcing portion 29 is located on one side of the third reinforcing portion 27; or the fourth reinforcing portion 29 includes a third sub-reinforcing portion 30 and a fourth sub-reinforcing portion 31, and the third sub-reinforcing portion 30 and the fourth sub-reinforcing portion 31 are respectively located on both sides of the third reinforcing portion 27. In this way, the welding points are more uniform, and the welding strength is higher.

[0042] As shown in FIG. 1, Figure 14 , the second flow channel 22 includes an outlet 32, and the at least two second communication holes 23 include a third through hole 33 and a fourth through hole 34, the third through hole 33 is closer to the outlet 32 relative to the fourth through hole 34, and the flow area of the fourth through hole 34 is greater than that of the third through hole 33. In this way, the water resistance of the fluid in the third through hole 33 is greater than that in the fourth through hole 34, thereby balancing the water resistance of the fluid entering the third through hole 33 and the fourth through hole 34, and the distribution of the fluid is more uniform.

[0043] Any technical features of the above technical solutions can be combined, and to make the description brief, all possible combinations of the technical features in the above technical solutions are not described, however, as long as the combinations of the technical features do not exist contradictory, it should be considered that it is within the scope of the description.

[0044] The above technical solutions only express several embodiments of the utility model, the description is more specific and detailed, but it cannot be understood as the limitation of the utility model patent scope. It should be pointed out that for ordinary skilled person in the art, without departing from the concept of the utility model, a number of deformations can be made, which all belong to the protection scope of the utility model.

Claims

1. A heat exchanger, characterized by The connecting piece (5) has a first flow channel (8) and at least two first communication holes (9); the current collecting piece (6) has at least one first hole channel (12), the first communication hole (9) communicates the first flow channel (8) and the first hole channel (12); the connecting piece (5) is further fixed or integrally formed with at least one first reinforcing portion (14), two adjacent first communication holes (9) are located on both sides of the first reinforcing portion (14) respectively, and at least part of the first reinforcing portion (14) is fixedly connected with the current collecting piece (6).

2. The heat exchanger of claim 1, wherein The current collecting piece (6) includes at least one flow-through plate (10), the flow-through plate (10) has at least one first cross beam (15) and at least two first hole channels (12), two adjacent first hole channels (12) are located on both sides of the first cross beam (15) respectively; The first reinforcing portion (14) is fixedly connected with the first cross beam (15).

3. The heat exchanger of claim 2, wherein A plane parallel to the flow-through plate (10) is defined as a projection plane, a normal projection of the first reinforcing portion (14) on the projection plane is a first projection, a normal projection of the first cross beam (15) on the projection plane is a second projection, and the first projection is located in the second projection.

4. The heat exchanger according to claim 2 or 3, characterized in that The connecting piece (5) further has at least one second reinforcing portion (16), the extension direction of the second reinforcing portion (16) intersects with the extension direction of the first reinforcing portion (14), and at least part of the second reinforcing portion (16) is fixedly connected with the first cross beam (15).

5. The heat exchanger of claim 4, wherein The second reinforcing portion (16) is located on one side of the first reinforcing portion (14); or the second reinforcing portion (16) includes a first sub-reinforcing portion (17) and a second sub-reinforcing portion (18), the first sub-reinforcing portion (17) and the second sub-reinforcing portion (18) are located on both sides of the first reinforcing portion (14) respectively.

6. The heat exchanger according to any one of claims 1 to 3 and 5, characterized in that The first flow channel (8) includes an inlet (19), the at least two first communication holes (9) include a first communication hole (20) and a second communication hole (21), the first communication hole (20) is closer to the inlet (19) than the second communication hole (21), and the flow-through cross-sectional area of the second communication hole (21) is greater than that of the first communication hole (20).

7. The heat exchanger according to any one of claims 1 to 3 and 5, characterized in that The connecting piece (5) further has a second flow channel (22) and at least two second communication holes (23); the current collecting piece (6) has at least one second hole channel (35), the second communication hole (23) communicates the second flow channel (22) and the second hole channel (35); the connecting piece (5) is further fixed or integrally formed with at least one third reinforcing portion (27), two adjacent second communication holes (23) are located on both sides of the third reinforcing portion (27) respectively, and at least part of the third reinforcing portion (27) is fixedly connected with the current collecting piece (6).

8. The heat exchanger of claim 7, wherein The flow-through plate (10) has at least one second cross beam (28) and at least two second holes (35), and two adjacent second holes (35) are respectively located on two sides of the second cross beam (28); the third reinforcing part (27) is fixedly connected with the second cross beam (28).

9. The heat exchanger of claim 8, wherein, The third reinforcing part (27) is a third projection in the orthographic projection of the projection plane, and the second cross beam (28) is a fourth projection in the orthographic projection of the projection plane, and the third projection is located in the fourth projection.

10. The heat exchanger according to claim 7 or 8, characterized in that The connecting piece (5) further has at least one fourth reinforcing part (29), the extending direction of the fourth reinforcing part (29) intersects with the extending direction of the third reinforcing part (27), and at least part of the fourth reinforcing part (29) is fixedly connected with the second cross beam (28).

11. The heat exchanger of claim 10, wherein The fourth reinforcing part (29) is located on one side of the third reinforcing part (27); or the fourth reinforcing part (29) comprises a third sub-reinforcing part (30) and a fourth sub-reinforcing part (31), and the third sub-reinforcing part (30) and the fourth sub-reinforcing part (31) are respectively located on two sides of the third reinforcing part (27).

12. The heat exchanger according to any one of claims 7 to 8 and 11, characterized in that The second flow channel (22) comprises an outlet (32), at least two second communication holes (23) comprise a third through hole (33) and a fourth through hole (34), the third through hole (33) is closer to the outlet (32) than the fourth through hole (34), and the flow-through cross-sectional area of the fourth through hole (34) is greater than that of the third through hole (33).

13. Heat exchanger, characterized in that The connecting piece (5) has a first flow channel (8) and at least one first flow-through hole (36); the collecting piece (6) has at least one first hole (12), the first flow-through hole (36) communicates the first flow channel (8) and the first hole (12); the connecting piece (5) further has at least one first reinforcing part (14), the first reinforcing part (14) is located in the first flow-through hole (36), one end of the first reinforcing part (14) is fixedly connected with the wall forming the first flow-through hole (36) or is an integral structure, the other end of the first reinforcing part (14) is fixedly connected with the wall forming the first flow-through hole (36) or is an integral structure, and at least part of the first reinforcing part (14) is welded with the collecting piece (6).

14. The heat exchanger of claim 13, wherein The connecting piece (5) further has a second flow channel (22) and at least one second flow-through hole (37); the current collector (6) has at least one second hole channel (35), the second flow-through hole (37) communicates the second flow channel (22) with the second hole channel (35); the connecting piece (5) further has at least one third reinforcing part (27), the third reinforcing part (27) is located at the second flow-through hole (37), one end of the third reinforcing part (27) is fixedly connected with or is an integral structure with the wall forming the second flow-through hole (37), the other end of the third reinforcing part (27) is fixedly connected with or is an integral structure with the wall forming the second flow-through hole (37), and at least part of the third reinforcing part (27) is welded with the current collector (6).

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