Heat exchanger

Abstract

The present invention provides a heat exchanger, comprising: flat tubes, there are a plurality of flat tubes, and the plurality of flat tubes are arranged at intervals; a first sealing cushion block, which is arranged between two adjacent flat tubes, and the first sealing cushion block is located at the end of the flat tube to seal the gap between two adjacent flat tubes through the first sealing cushion block; a manifold housing, the manifold housing has a first opening, at least part of the first sealing cushion block and the end of the flat tube are inserted into the first opening, so that the manifold housing, the flat tube and the first sealing cushion block enclose a manifold channel. Through the technical solution provided by the present invention, the technical problem of the weak connection strength between the manifold pipe and the flat tube in the prior art can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of heat exchangers, and in particular, to a heat exchanger. Background Art

[0002] Currently, heat exchangers in the prior art generally include a circular header and a plurality of flat tubes. A plurality of insertion holes are provided on the circular header, and the plurality of flat tubes are arranged in one-to-one correspondence with the plurality of insertion holes. Each flat tube is inserted into a corresponding insertion hole and then welded.

[0003] During the welding process, the flat tube will be rigidly constrained by the insertion hole of the header. Even if the flat tube is subjected to the pre-tightening force of the fixture, the flat tube will hardly have displacement in the height direction, especially the flat tube near the end of the header. Since the composite layer on the plate surface of the flat tube will melt during welding, some weld joints near the insertion hole of the header will be difficult to weld together, easily forming false welds and affecting the pressure resistance of the product. Summary of the Invention

[0004] The main object of the present invention is to provide a heat exchanger to solve the technical problem of weak connection strength between the header and the flat tube in the prior art.

[0005] To achieve the above object, the present invention provides a heat exchanger, including: a plurality of flat tubes arranged at intervals; a first sealing pad provided between two adjacent flat tubes, the first sealing pad being located at the end of the flat tube to seal the gap between two adjacent flat tubes; a header housing having a first opening, at least part of the first sealing pad and the end of the flat tube are inserted into the first opening, so that the header housing, the flat tube and the first sealing pad enclose a header channel.

[0006] Further, the header housing includes a main body part and an insertion part. The insertion part is provided on the main body part, the insertion part is provided at the end of the main body part, and the insertion part has a first opening. At least part of the first sealing pad and the end of the flat tube are inserted into the insertion part.

[0007] Further, the insertion part includes a first insertion plate and a second insertion plate. The first insertion plate and the second insertion plate are oppositely arranged at both ends of the main body part, and the first insertion plate and the second insertion plate are arranged at intervals to form a first opening, so that at least part of the first sealing pad and the end of the flat tube are inserted between the first insertion plate and the second insertion plate.

[0008] Further, the first sealing pad includes a first main body block and a first insertion block. The first insertion block is provided on the first main body block, the first main body block is provided at the end of the flat tube, and the first insertion block is inserted into the first opening.

[0009] Further, the first plugging block has a first side surface, a second side surface, and an arc-shaped concave surface. The first side surface, the arc-shaped concave surface, and the second side surface are sequentially connected. The arc-shaped concave surface is located on the side of the first plugging block away from the first main block. The first side surface is used for plugging at the first plugging board, and the second side surface is used for plugging at the second plugging board.

[0010] Further, a first positioning structure is provided on the first sealing cushion block, and a second positioning structure cooperating with the first positioning structure is provided on the flat tube. The first positioning structure and the second positioning structure are arranged opposite to each other to position the first sealing cushion block through the first positioning structure and the second positioning structure.

[0011] Further, the first positioning structure is a first positioning protrusion, and the second positioning structure is a first positioning groove. The first positioning protrusion and the first positioning groove are arranged opposite to each other, and the first positioning protrusion is arranged in the first positioning groove to position the first sealing cushion block.

[0012] Further, the first sealing cushion block has a first fitting surface and a second fitting surface arranged opposite to each other. The end of the flat tube has a first surface and a second surface arranged opposite to each other. The first fitting surface is arranged in cooperation with the first surface at the end of the flat tube, and the second fitting surface is arranged in cooperation with the second surface at the end of the flat tube, so that the first fitting surface is arranged to fit the first surface and the second fitting surface is arranged to fit the second surface.

[0013] Further, the manifold housing has a second opening and a third opening arranged opposite to each other. The second opening is located at one end of the manifold housing, and the third opening is located at the other end of the manifold housing. The first opening, the second opening, and the third opening are all communicated. The heat exchanger further includes a sealing cover, and sealing covers are provided at both the second opening and the third opening to seal the second opening and the third opening through the sealing cover.

[0014] Further, the heat exchanger further includes a second sealing cushion block. The second sealing cushion block is arranged between the sealing cover and the flat tube. A third positioning structure is provided on the side of the second sealing cushion block close to the sealing cover to position the sealing cover through the third positioning structure.

[0015] Further, the second sealing cushion block includes a second main block and a second plugging block. The second plugging block is arranged on the second main block. The second main block protrudes from the second plugging block to form a positioning step, and the positioning step forms the third positioning structure to position the sealing cover through the positioning step.

[0016] Further, a fourth positioning structure is further provided on the flat tube, and a fifth positioning structure cooperating with the fourth positioning structure is provided on the second sealing cushion block. The fourth positioning structure and the fifth positioning structure are arranged opposite to each other to position the second sealing cushion block through the fourth positioning structure and the fifth positioning structure.

[0017] Further, the fourth positioning structure is a second positioning protrusion, and the fifth positioning structure is a second positioning groove. The second positioning protrusion and the second positioning groove are oppositely arranged, and the second positioning protrusion is arranged in the second positioning groove to position the second sealing cushion block.

[0018] Further, an arc-shaped port is arranged at the end of the flat tube, and the arc-shaped port is inserted into the first opening to communicate the flow collecting channel with the fluid channel in the flat tube.

[0019] Further, the flow collecting housing, the flat tube, and the first sealing cushion block are welded to form the flow collecting channel.

[0020] Applying the technical solution of the present invention, by inserting at least part of the first sealing cushion block and the end of the flat tube into the first opening, the flow collecting channel can be formed by the flow collecting housing, multiple flat tubes, and multiple first sealing cushion blocks. In this way, when welding, the flat tube will not be restricted in the height direction. Specifically, when the heat exchanger is welded in the furnace, the flat tube can freely perform layer drop under the pre-tightening action of the fixture. When the composite layer on the surface of the flat tube melts, the two tube plates of the flat tube can always be pressed and fitted to ensure that all the welding points on the tube plates can be welded together, improving the connection strength between the flow collecting housing and the flat tube and ensuring the pressure resistance of the product. Therefore, through the technical solution provided by the present invention, the technical problem of the weak connection strength between the flow collecting pipe and the flat tube in the prior art can be solved. Description of the Drawings

[0021] The schematic drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0022] Figure 1 Shows an exploded view of a heat exchanger provided by Embodiment 1 of the present invention;

[0023] Figure 2 Shows a schematic structural view of a first sealing cushion block provided by Embodiment 1 of the present invention;

[0024] Figure 3 Shows a schematic structural view of a second sealing cushion block provided by Embodiment 1 of the present invention;

[0025] Figure 4 Shows a front view of a heat exchanger provided by Embodiment 1 of the present invention;

[0026] Figure 5 Shows Figure 4 The A-A view in

[0027] Figure 6 Shows a side view of a heat exchanger provided by Embodiment 1 of the present invention;

[0028] Figure 7 shows a schematic structural view of a flat tube provided according to Embodiment 1 of the present invention;

[0029] Figure 8 shows a front view of a flat tube provided according to Embodiment 1 of the present invention;

[0030] Figure 9 shows Figure 8 the view in the direction of B - B in

[0031] Figure 10 shows a schematic structural view of a flat tube provided according to Embodiment 2 of the present invention;

[0032] Figure 11 shows a schematic structural view of a heat exchanger provided according to Embodiment 3 of the present invention; and

[0033] Figure 12 shows a schematic structural view of a heat exchanger provided according to Embodiment 4 of the present invention.

[0034] Among them, the above - mentioned drawings include the following reference numerals:

[0035] 10, flat tube; 11, arc - shaped port; 12, second positioning structure; 20, first sealing cushion block; 21, first main body block; 22, first plug - in block; 23, first positioning structure; 30, manifold housing; 31, first opening; 32, second opening; 33, third opening; 34, main body part; 35, first plug - in plate; 36, second plug - in plate; 40, sealing cover; 50, second sealing cushion block; 51, second main body block; 52, second plug - in block; 53, fifth positioning structure; 60, heat - exchange fins; 70, side plate; 80, connecting pipe. Detailed Embodiment

[0036] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0037] As Figures 1 to 9As shown in the figure, Embodiment 1 of the present invention provides a heat exchanger, which includes: flat tubes 10, first sealing pads 20, and a manifold housing 30. There are multiple flat tubes 10, and the multiple flat tubes 10 are arranged at intervals. There are multiple first sealing pads 20, and a first sealing pad 20 is arranged between two adjacent flat tubes 10. The first sealing pad 20 is located at the end of the flat tube 10 to seal the gap between two adjacent flat tubes 10 through the first sealing pad 20. The manifold housing 30 has a first opening 31, and at least part of the first sealing pad 20 and the end of the flat tube 10 are inserted into the first opening 31, so that the manifold housing 30, the flat tubes 10, and the first sealing pads 20 enclose a manifold channel.

[0038] By using the heat exchanger provided in this embodiment, by inserting at least part of the first sealing pad 20 and the end of the flat tube 10 into the first opening 31, a manifold channel can be enclosed by the manifold housing 30, multiple flat tubes 10, and multiple first sealing pads 20 in this way. In this way, when the heat exchanger is subjected to furnace welding, since the flat tube 10 is not restricted by the first opening 31 in the height direction, the flat tube 10 can freely perform layer drop under the pre-tightening action of the fixture. Specifically, the flat tube 10 will perform layer drop along the extension direction of the opening of the first opening 31 (the extension direction of the first opening 31 is the same as the flow direction of the liquid in the manifold housing 30). When the composite layer on the surface of the flat tube 10 melts, it can ensure that the two tube plates of the flat tube 10 are always pressed and fitted, so as to ensure that all the solder joints on the tube plates can be welded, improving the connection strength between the manifold housing 30 and the flat tube 10 and ensuring the pressure resistance of the heat exchanger. Therefore, through the heat exchanger provided in the embodiment of the present invention, the technical problem of the weak connection strength between the manifold pipe and the flat tube 10 in the prior art can be solved.

[0039] In this embodiment, the manifold housing 30 includes a main body 34 and a plug-in part. The plug-in part is arranged on the main body 34. The plug-in part is arranged at the end of the main body 34. The plug-in part has a first opening 31, and at least part of the first sealing pad 20 and the end of the flat tube 10 are inserted into the plug-in part. With such a setting, it is convenient for at least part of the first sealing pad 20 and the end of the flat tube 10 to be inserted into the first opening 31, improving the connection stability, facilitating pre-installation by the staff before welding, and improving the operation convenience. Specifically, the main body 34 in this embodiment is an arc-shaped housing to facilitate enclosing the manifold channel. In this embodiment, the main body 34 and the plug-in part can be an integrally formed structure. Specifically, the manifold housing 30 in this embodiment can be a C-shaped open housing structure.

[0040] Specifically, the insertion part in this embodiment includes a first insertion plate 35 and a second insertion plate 36, which are oppositely arranged at both ends of the main body part 34. The first insertion plate 35 and the second insertion plate 36 are spaced apart to form a first opening 31, so that at least part of the first sealing gasket 20 and the end of the flat tube 10 are inserted between the first insertion plate 35 and the second insertion plate 36. With such a setting, the connection stability between the first sealing gasket 20, the flat tube 10 and the manifold housing 30 can be further improved, and the first sealing gasket 20, the flat tube 10 and the manifold housing 30 can be prevented from falling off before welding. Specifically, the first insertion plate 35 and the second insertion plate 36 can also be arranged in parallel. Or along the extension direction from the main body part 34 to the insertion part, the spacing distance between the first insertion plate 35 and the second insertion plate 36 gradually decreases, so as to better improve the insertion stability and the connection stability between the first sealing gasket 20, the flat tube 10 and the manifold housing 30.

[0041] In this embodiment, the first sealing gasket 20 includes a first main body block 21 and a first insertion block 22. The first insertion block 22 is arranged on the first main body block 21. The first main body block 21 is arranged at the end of the flat tube 10, and the first insertion block 22 is inserted into the first opening 31. With such a setting, the gap between two adjacent flat tubes 10 can be sealed by the first main body block 21, and the first insertion block 22 can be conveniently inserted into the first opening 31 to form a manifold channel. In this embodiment, the first main body block 21 and the first insertion block 22 can be an integrally formed structure. Specifically, the first sealing gasket 20 in this embodiment can be a T-shaped block, and the T-shaped block can be inserted into the opening side of the C-shaped manifold housing 30. The inner side wall of the end of the C-shaped manifold housing 30 is engaged with the outer side wall of the T-shaped block, and after brazing, the first sealing gasket 20, the manifold housing 30 and the flat tube 10 are integrated. Multiple first sealing gaskets 20 arranged in a stacked manner can be provided between two adjacent flat tubes 10 according to actual situations.

[0042] Specifically, the first insertion block 22 in this embodiment has a first side surface, a second side surface and an arc-shaped concave surface. The first side surface, the arc-shaped concave surface and the second side surface are sequentially connected. The arc-shaped concave surface is located on the side of the first insertion block 22 away from the first main body block 21. The first side surface is used for insertion at the first insertion plate 35, and the second side surface is used for insertion at the second insertion plate 36. With such a setting, it is convenient for better insertion and improves the connection stability. At the same time, by adding an arc-shaped concave surface between the first side surface and the second side surface, the blocking effect of the first insertion block 22 on the fluid flow in the manifold tube can be reduced, so as to increase the flow cross-sectional area in the manifold tube and improve the fluid flow velocity.

[0043] In this embodiment, a first positioning structure 23 is provided on the first sealing cushion block 20, and a second positioning structure 12 cooperating with the first positioning structure 23 is provided on the flat tube 10. The first positioning structure 23 and the second positioning structure 12 are arranged opposite to each other to position the first sealing cushion block 20 through the first positioning structure 23 and the second positioning structure 12. With such an arrangement, it is possible to avoid the situation that the first sealing cushion block 20 between two adjacent flat tubes 10 shakes and is misaligned during the assembly process. With the cooperation of the first positioning structure 23 and the second positioning structure 12, the first sealing cushion block 20 can be stably positioned, thereby ensuring the setting stability of the first sealing cushion block 20 and facilitating the guarantee that the first sealing cushion block 20 or the flat tube 10 does not move during the welding process.

[0044] Specifically, the first positioning structure 23 in this embodiment is a first positioning protrusion, and the second positioning structure 12 is a first positioning groove. The first positioning protrusion and the first positioning groove are arranged opposite to each other, and the first positioning protrusion is arranged in the first positioning groove to position the first sealing cushion block 20. The structures of the first positioning protrusion and the first positioning groove are simple and easy to manufacture. At the same time, the cooperation of the first positioning protrusion and the first positioning groove can improve the positioning stability and better avoid the phenomenon that the first sealing cushion block 20 shakes relative to the flat tube 10.

[0045] In this embodiment, the first sealing cushion block 20 has a first fitting surface and a second fitting surface arranged opposite to each other. The end of the flat tube 10 has a first surface and a second surface arranged opposite to each other. The first fitting surface is arranged in cooperation with the first surface at the end of the flat tube 10, and the second fitting surface is arranged in cooperation with the second surface at the end of the flat tube 10, so that the first fitting surface is arranged to fit the first surface and the second fitting surface is arranged to fit the second surface. Specifically, along the flow direction of the fluid in the current collector housing 30, the first sealing cushion block 20 has a first surface and a second surface arranged opposite to each other. With such a fitting arrangement, it is possible to better seal the gap between two adjacent flat tubes 10 through the first sealing cushion block 20 to prevent the fluid from leaking from the gap between the first sealing cushion block 20 and the flat tube 10.

[0046] Specifically, the first surface in this embodiment can be a first arc convex surface, the second surface can be a second arc convex surface, the first fitting surface can be a first arc concave surface, and the second fitting surface can be a second arc concave surface. The first arc concave surface is attached to the first arc convex surface, and the second arc concave surface is attached to the second arc convex surface, so as to facilitate the first sealing cushion block 20 to better seal the gap between two adjacent flat tubes 10 and further improve the sealing effect.

[0047] In this embodiment, the current collector housing 30 has a second opening 32 and a third opening 33 which are oppositely arranged. The second opening 32 is located at one end of the current collector housing 30, and the third opening 33 is located at the other end of the current collector housing 30. The second opening 32 and the third opening 33 are oppositely arranged, and the first opening 31, the second opening 32 and the third opening 33 are all communicated. The heat exchanger further includes a sealing cover 40. Sealing covers 40 are provided at both the second opening 32 and the third opening 33 to seal the second opening 32 and the third opening 33 through the sealing covers 40. With such an arrangement, it is possible to prevent the fluid in the current collector housing 30 from flowing out from the second opening 32 or the third opening 33, so as to seal the end of the current collector channel through the sealing cover 40.

[0048] In this embodiment, the heat exchanger further includes a second sealing cushion block 50. The second sealing cushion block 50 is arranged between the sealing cover 40 and the flat tube 10. A third positioning structure is provided on one side of the second sealing cushion block 50 close to the sealing cover 40 to position the sealing cover 40 through the third positioning structure. Specifically, the third positioning structure in this embodiment abuts against and positions the sealing cover 40 to prevent the sealing cover 40 from shifting relative to the second sealing cushion block 50, thereby improving the stability of the arrangement.

[0049] Specifically, the second sealing cushion block 50 in this embodiment includes a second main block 51 and a second insertion block 52. The second insertion block 52 is arranged on the second main block 51. The second main block 51 protrudes from the second insertion block 52 to form a positioning step. The positioning step forms the third positioning structure to position the sealing cover 40 through the positioning step. The step surface of the positioning step in this embodiment is adapted to the end face of the sealing cover 40 to abut against and position the sealing cover 40 through the step surface of the positioning step, so as to stably position the sealing cover 40 and further improve the stability of the arrangement.

[0050] In this embodiment, a fourth positioning structure is further provided on the flat tube 10, and a fifth positioning structure 53 cooperating with the fourth positioning structure is provided on the second sealing cushion block 50. The fourth positioning structure and the fifth positioning structure 53 are oppositely arranged to position the second sealing cushion block 50 through the fourth positioning structure and the fifth positioning structure 53. With such an arrangement, it is convenient to position the second sealing cushion block 50 through the cooperation of the fourth positioning structure and the fifth positioning structure 53, and prevent the second sealing cushion block 50 from moving relative to the flat tube 10, thereby improving the setting stability of the second sealing cushion block 50.

[0051] Specifically, the fourth positioning structure in this embodiment is a second positioning protrusion, and the fifth positioning structure 53 is a second positioning groove. The second positioning protrusion and the second positioning groove are arranged oppositely, and the second positioning protrusion is arranged in the second positioning groove to position the second sealing cushion block 50. With such an arrangement, through the cooperation of the second positioning protrusion and the second positioning groove, it is possible to better limit the installation position of the second sealing cushion block 50.

[0052] Specifically, an arc-shaped port 11 can be provided at the end of the flat tube 10. The arc-shaped port 11 is inserted into the first opening 31, and the arc-shaped port 11 is communicated with the fluid channel in the flat tube 10, so that the manifold channel is communicated with the fluid channel in the flat tube 10. With such an arrangement, the flow cross-sectional area in the manifold housing 30 can be increased.

[0053] In this embodiment, the manifold housing 30, the flat tube 10, and the first sealing cushion block 20 are welded to enclose a manifold channel, so that the manifold housing 30, the flat tube 10, and the first sealing cushion block 20 form an integral structure.

[0054] In this embodiment, the heat exchanger further includes heat exchange fins 60, side plates 70, and connecting pipes 80. The heat exchange fins 60 are arranged on the flat tube 10, the side plates 70 are located at the ends of the heat exchanger, and the connecting pipes 80 are used to communicate with the manifold channel.

[0055] Embodiment 2 of the present invention provides a heat exchanger. The difference between the heat exchanger in Embodiment 2 and the heat exchanger in Embodiment 1 lies in the different structures of the flat tube 10. The structure of the flat tube 10 of the heat exchanger in Embodiment 2 is as Figure 10 shown.

[0056] Embodiment 3 of the present invention provides a heat exchanger. The difference between the heat exchanger in Embodiment 3 and the heat exchanger in Embodiment 1 lies in the different structures of the flat tube 10. The structure of the flat tube 10 of the heat exchanger in Embodiment 3 is as Figure 11 shown.

[0057] Embodiment 4 of the present invention provides a heat exchanger. The difference between the heat exchanger in Embodiment 4 and the heat exchanger in Embodiment 1 lies in the different structures of the flat tube 10. The structure of the flat tube 10 of the heat exchanger in Embodiment 4 is as Figure 12 shown.

[0058] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects: improving the connection strength between the manifold housing and the flat tube, improving the pressure resistance of the heat exchanger, increasing the flow area in the manifold housing, reducing the flow resistance in the manifold channel, and reducing the influence on the performance of the refrigeration system.

[0059] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, various modifications and variations can be made to the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A heat exchanger, characterized in that, Comprising: Flat tubes (10), there are multiple of the flat tubes (10), and the multiple flat tubes (10) are arranged at intervals; A first sealing cushion block (20), arranged between two adjacent flat tubes (10), the first sealing cushion block (20) is located at the end of the flat tube (10) to seal the gap between two adjacent flat tubes (10) through the first sealing cushion block (20); A manifold housing (30), the manifold housing (30) has a first opening (31), at least part of the first sealing cushion block (20) and the end of the flat tube (10) are inserted into the first opening (31), so that the manifold housing (30), the flat tube (10) and the first sealing cushion block (20) enclose a manifold channel; The first openings (31) are arranged in communication in the extending direction, and the first sealing cushion blocks (20) and the flat tubes (10) are alternately arranged and stacked along the extending direction of the first opening (31). A surface composite layer is provided on the surface of the flat tube (10), and the two tube sheets of the flat tube (10) are pressed and adhered after the surface composite layer melts; when the heat exchanger is subjected to furnace welding, the flat tube (10) can freely perform layer lowering along the extending direction of the first opening (31) under the pre-tightening action of the fixture, and the extending direction of the first opening (31) is the same as the flowing direction of the liquid in the manifold housing (30).

2. The heat exchanger according to claim 1, characterized in that, The manifold housing (30) includes a main body part (34) and a plug-in part. The plug-in part is arranged on the main body part (34), the plug-in part is arranged at the end of the main body part (34), the plug-in part has the first opening (31), and at least part of the first sealing cushion block (20) and the end of the flat tube (10) are inserted into the plug-in part.

3. The heat exchanger according to claim 2, wherein The plug-in part includes a first plug-in plate (35) and a second plug-in plate (36). The first plug-in plate (35) and the second plug-in plate (36) are oppositely arranged at both ends of the main body part (34). The first plug-in plate (35) and the second plug-in plate (36) are arranged at intervals to form the first opening (31), so that at least part of the first sealing cushion block (20) and the end of the flat tube (10) are inserted between the first plug-in plate (35) and the second plug-in plate (36).

4. The heat exchanger according to claim 3, characterized in that, The first sealing cushion block (20) includes a first main body block (21) and a first plug-in block (22). The first plug-in block (22) is arranged on the first main body block (21). The first main body block (21) is arranged at the end of the flat tube (10), and the first plug-in block (22) is inserted into the first opening (31).

5. The heat exchanger according to claim 4, characterized in that, The first plug-in block (22) has a first side surface, a second side surface, and an arc-shaped concave surface. The first side surface, the arc-shaped concave surface, and the second side surface are sequentially connected. The arc-shaped concave surface is located on the side of the first plug-in block (22) away from the first main block (21). The first side surface is used for plugging at the first plug-in board (35), and the second side surface is used for plugging at the second plug-in board (36).

6. The heat exchanger according to claim 1, characterized in that, A first positioning structure (23) is provided on the first sealing cushion block (20), and a second positioning structure (12) cooperating with the first positioning structure (23) is provided on the flat tube (10). The first positioning structure (23) and the second positioning structure (12) are arranged opposite to each other to position the first sealing cushion block (20) through the first positioning structure (23) and the second positioning structure (12).

7. The heat exchanger according to claim 6, characterized in that, The first positioning structure (23) is a first positioning protrusion, and the second positioning structure (12) is a first positioning groove. The first positioning protrusion and the first positioning groove are arranged opposite to each other, and the first positioning protrusion is arranged in the first positioning groove to position the first sealing cushion block (20).

8. The heat exchanger according to claim 1, characterized in that, The first sealing cushion block (20) has a first fitting surface and a second fitting surface arranged opposite to each other. The end of the flat tube (10) has a first surface and a second surface arranged opposite to each other. The first fitting surface is arranged in cooperation with the first surface at the end of the flat tube (10), and the second fitting surface is arranged in cooperation with the second surface at the end of the flat tube (10), so that the first fitting surface fits the first surface and the second fitting surface fits the second surface.

9. The heat exchanger according to claim 1, wherein, The manifold housing (30) has a second opening (32) and a third opening (33) arranged opposite to each other. The second opening (32) is located at one end of the manifold housing (30), and the third opening (33) is located at the other end of the manifold housing (30). The first opening (31), the second opening (32), and the third opening (33) are all communicated. The heat exchanger further includes a sealing cover (40), and the sealing cover (40) is provided at both the second opening (32) and the third opening (33) to seal the second opening (32) and the third opening (33) through the sealing cover (40).

10. The heat exchanger according to claim 9, characterized in that, The heat exchanger further includes a second sealing cushion block (50). The second sealing cushion block (50) is arranged between the sealing cover (40) and the flat tube (10). A third positioning structure is provided on the side of the second sealing cushion block (50) close to the sealing cover (40) to position the sealing cover (40) through the third positioning structure.

11. The heat exchanger according to claim 10, characterized in that, The second sealing spacer block (50) includes a second main body block (51) and a second insertion block (52). The second insertion block (52) is arranged on the second main body block (51). The second main body block (51) protrudes from the second insertion block (52) to form a positioning step. The positioning step forms the third positioning structure to position the sealing cover (40) through the positioning step.

12. The heat exchanger according to claim 10, wherein A fourth positioning structure is further arranged on the flat tube (10). A fifth positioning structure (53) that cooperates with the fourth positioning structure is arranged on the second sealing spacer block (50). The fourth positioning structure and the fifth positioning structure (53) are arranged opposite to each other to position the second sealing spacer block (50) through the fourth positioning structure and the fifth positioning structure (53).

13. The heat exchanger according to claim 12, characterized in that, The fourth positioning structure is a second positioning protrusion, and the fifth positioning structure (53) is a second positioning groove. The second positioning protrusion and the second positioning groove are arranged opposite to each other. The second positioning protrusion is arranged in the second positioning groove to position the second sealing spacer block (50).

14. The heat exchanger according to claim 1, characterized in that, An arc-shaped port (11) is arranged at the end of the flat tube (10). The arc-shaped port (11) is inserted into the first opening (31) so that the flow collection channel is communicated with the fluid channel in the flat tube (10).

15. The heat exchanger according to claim 1, characterized in that, The flow collection housing (30), the flat tube (10), and the first sealing spacer block (20) enclose the flow collection channel by welding.

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