Heat exchanger
By adopting the axial spacing arrangement of the first heat exchanger in the heat exchanger, the problem of difficulty in uniform distribution of refrigerant in the double row and above heat exchangers is solved, and more efficient refrigerant distribution is achieved and welding costs are reduced.
Patent Information
- Application Number
- CN202422200972.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-06
- Publication Date
- 2025-08-05
- Estimated Expiration
- 2034-09-06
AI Technical Summary
When used as an evaporator or heat pump heat exchanger, it is difficult to distribute the refrigerant from the heat exchanger on the windward side, making it difficult to distribute the refrigerant into each heat exchanger evenly.
The first heat exchange pipe is arranged in which the first pipe section, the second pipe section and the first communication section are arranged in the axial space of the first pipe to reduce the number of communication with the header. The refrigerant reaches the second heat exchange section through the first heat exchange section and the multiple communication sections to achieve more uniform distribution.
The uniform distribution of refrigerant in the heat exchanger is achieved, the welding cost and refrigerant charge amount are reduced, and the heat exchange efficiency and the distribution uniformity of refrigerant are improved.
Smart Images
Figure CN223192194U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of heat exchange, and specifically relates to a heat exchanger for a heat pump. Background Art
[0002] When double-row and above heat exchangers are used as evaporators or heat pump heat exchangers, the heat exchange tubes in the first row on the windward side have better heat exchange performance than the other heat exchange tubes in the rear rows. In related technologies, in order to improve the heat exchange performance of the heat exchanger on the windward side, most heat exchangers have a relatively large number of heat exchange tubes laid on at least the windward side, resulting in a relatively large number of heat exchange tubes being connected to the same header. However, the more heat exchange tubes are connected to the same header, the more difficult it is for the refrigerant to be evenly distributed to each heat exchange tube. Summary of the Utility Model
[0003] This application provides a heat exchanger that can make it easier for the refrigerant to be evenly distributed to each heat exchange tube.
[0004] The heat exchanger provided by this application includes a first heat exchange part, a second heat exchange part and a plurality of connecting parts. The first heat exchange part includes a first header and a plurality of first heat exchange tubes. The first header has a first interface, and the first interface is connected to the first header. The first heat exchange tube includes a first tube section, a second tube section and a first connecting section. The first tube section and the second tube section are arranged at intervals along the axial direction of the first header. One end of the first tube section is connected to the first header, and the first connecting section connects the other end of the first tube section and one end of the second tube section. The second heat exchange part is located on one side in the radial direction of the first header, and the connecting part connects the other end of the second tube section and the second heat exchange part.
[0005] In this heat exchanger, the first heat exchange tube includes a first tube section, a second tube section and a first connecting section. The first tube section and the second tube section are arranged at intervals along the axial direction of the first header. One end of the first tube section is connected to the first header, and the first connecting section connects the other end of the first tube section and one end of the second tube section. The other end of the second tube section is connected to the connecting part and not connected to the first header. Such an arrangement can reduce the number of heat exchange tubes connected to the first header (the second tube section is not connected to the first header), so that the refrigerant can be more easily and evenly distributed to each heat exchange tube. Brief Description of the Drawings
[0006] Figure 1 It is a schematic structural diagram of the heat exchanger provided by this application in the first specific embodiment;
[0007] Figure 2 It is a schematic structural diagram of the connecting part provided by this application in the first specific embodiment;
[0008] Figure 3Schematic diagram of the connection part provided by this application in the second specific embodiment;
[0009] Figure 4 Schematic diagram of the heat exchanger provided by this application in the second specific embodiment;
[0010] Figure 5 Schematic diagram of the heat exchanger provided by this application in the third specific embodiment;
[0011] Figure 6 Schematic diagram of the connection part provided by this application in the third specific embodiment;
[0012] Figure 7 Schematic diagram of the heat exchanger provided by this application in the fourth specific embodiment.
[0013] Reference numerals: First heat exchange part 1, first header 11, first tube cavity 111, second tube cavity 112, first interface 12, first sub-interface 121, second sub-interface 122, first heat exchange tube 13, first tube section 131, second tube section 132, first connection section 133, second heat exchange part 2, second header 21, third tube cavity 211, fourth tube cavity 212, second interface 22, third sub-interface 221, fourth sub-interface 222, second heat exchange tube 23, third tube section 231, fourth tube section 232, second connection section 233, connection part 3, first tube 31, first opening 3, second opening 312, third connection section 32, second tube 33, third tube 34, third heat exchange tube 35, fifth tube section 351, sixth tube section 352, fourth connection section 353, fin 4.
[0014] The accompanying drawings here are incorporated into the specification and form a part of this specification, showing embodiments consistent with this application and used together with the specification to explain the principles of this application. Detailed Description of the Embodiments
[0015] For a better understanding of the technical solutions of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.
[0016] It should be clear that the described embodiments are only part of the technical solutions of this application, rather than all of them. All other technical solutions obtained by those of ordinary skill in the art based on the technical solutions in this application without creative efforts belong to the scope protected by this application.
[0017] The terms used in the embodiments of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The singular forms of "a", "the", and "said" used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.
[0018] It should be understood that the term "and / or" used herein is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this text generally indicates that the associated objects before and after are in an "or" relationship.
[0019] It should be noted that the orientation terms such as "upper", "lower", "left", and "right" described in the embodiments of the present application are described from the angles shown in the drawings and should not be construed as limitations on the embodiments of the present application. In addition, in the context, it should also be understood that when it is mentioned that an element is connected "above" or "below" another element, it can not only be directly connected "above" or "below" another element, but also be indirectly connected "above" or "below" another element through an intermediate element.
[0020] As Figures 1-7 shown, the embodiments of the present application provide a heat exchanger, which includes a first heat exchange part 1, a second heat exchange part 2, and a plurality of connecting parts 3. Among them, the first heat exchange part 1 includes a first header 11, a first interface 12, and a plurality of first heat exchange tubes 13. The first interface 12 is connected to the first header 11. The first heat exchange tube 13 includes a first tube section 131, a second tube section 132, and a first connecting section 133. The first tube section 131 and the second tube section 132 are arranged at intervals along the axial direction of the first header 11. One end of the first tube section 131 is connected to the first header 11, and the first connecting section 133 connects the other end of the first tube section 131 and one end of the second tube section 132; the second heat exchange part 2 is located on one side of the radial direction of the first header 11, and the connecting part 3 connects the other end of the second tube section 132 and the second heat exchange part 2.
[0021] Specifically, in this embodiment, the length directions of the first tube section 131 and the second tube section 132 are substantially perpendicular to the axial direction of the first header 11. The first tube section 131 and the second tube section 132 can be microchannel flat tubes or circular tubes with small diameters, etc. Their structures can be preset according to different heat exchange requirements and usage scenarios, so the types and structures thereof are not specifically limited herein. In addition, the combined shape of the first tube section 131, the first connecting section 133, and the second tube section 132 of the first heat exchange tube 13 is generally U-shaped. Generally speaking, the first tube section 131, the first connecting section 133, and the second tube section 132 are of an integral structure, that is, they can be formed by bending a straight rod-shaped first heat exchange tube 13. In addition, when the first tube section 131, the first connecting section 133, and the second tube section 132 are some tube types that are inconvenient to bend, these three can also be combined into the first heat exchange tube 13 by means of welding or connection with other connectors.
[0022] In addition, multiple first heat exchange tubes 13 of the first heat exchange portion 1 are inserted into the side wall of the first header 11 at intervals, and the second heat exchange portion 2 is located on one side in the radial direction of the first header 11, which means that the second heat exchange portion 2 is located on one side of the first heat exchange portion 1 in the thickness direction. The two can form a certain angle or be parallel. Generally, the two are arranged in parallel, which can save more installation space.
[0023] In this heat exchanger, the first heat exchange tube 13 includes a first tube section 131, a second tube section 132, and a first connecting section 133. The first tube section 131 and the second tube section 132 are arranged at intervals along the axial direction of the first header 11. One end of the first tube section 131 is connected to the first header 11, the first connecting section 133 connects the other end of the first tube section 131 and one end of the second tube section 132, and the other end of the second tube section 132 is connected to the connecting portion 3 and not connected to the first header 11. Such an arrangement can reduce the number of heat exchange tube connections in the first header 11 (the second tube section 132 is not connected to the first header 11), so that the refrigerant can be more easily and evenly distributed to each heat exchange tube.
[0024] When this heat exchanger in this embodiment works as an evaporator or a heat pump, the first heat exchange portion 1 can be used as the windward side. The refrigerant can enter the first header 11 from the first interface 12, flow through the first tube section 131, the first connecting section 133, and the second tube section 132 in sequence for heat exchange, and then flow into the second heat exchange portion 2 for heat exchange. Since the first tube section 131 and the second tube section 132 are arranged along the axial direction of the first header 11, the first tube section 131, the first connecting section 133, and the second tube section 132 also extend the flow path of the refrigerant on the windward side, making the refrigerant exchange heat more fully on the windward side with higher heat exchange efficiency.
[0025] It should be noted that the heat exchanger in this embodiment can also reduce the refrigerant charge and the welding points on the first header 11. This is because in most heat exchangers with two or more rows, the connection between adjacent front and rear rows of heat exchange tubes is achieved by bending the heat exchange tubes or by using a manifold to bridge them. This requires each heat exchange tube in the same row to be connected to the manifold, that is, flux spraying is required for each heat exchange tube connected to the manifold. In addition, the more heat exchange tubes inserted into the same manifold, the greater the difficulty of evenly distributing the refrigerant, the worse the uniformity of distribution, and at the same time, the more refrigerant charge is required. However, in this embodiment, the first pipe section 131 and the second pipe section 132 are arranged at intervals along the axial direction of the first header 11, and only the first pipe section 131 needs to be connected to the first header 11, while the second pipe section 132 is connected to the second heat exchange part 2 through the connection part 3. Therefore, such a connection method reduces the number of heat exchange tubes connected to the same manifold, thereby achieving the effect of reducing the welding cost of the heat exchanger and the refrigerant distribution requirements, and the refrigerant charge is also correspondingly reduced.
[0026] For example, in a heat exchanger, the number of heat exchange tubes to be inserted into the same manifold is 50. This requires brazing these 50 heat exchange tubes, and when designing the distribution, it is necessary to try to evenly distribute the refrigerant into the 50 heat exchange tubes, which is difficult and not easy to achieve. After adopting the structure of the heat exchanger in this embodiment, the number of heat exchange tubes (the first heat exchange tube 13) can be reduced to 25. In addition to reducing the amount of flux spraying, it can also reduce the distribution requirements and make it easier to evenly distribute the refrigerant.
[0027] As Figure 1 shown, in a specific embodiment, the second heat exchange part 2 includes a second header 21, a second interface 22 and a plurality of second heat exchange tubes 23. The second interface 22 is connected to the second header 21. The second heat exchange tube 23 includes a third pipe section 231, a fourth pipe section 232 and a second connection section 233. The third pipe section 231 and the fourth pipe section 232 are arranged at intervals along the axial direction of the second header 21. One end of the third pipe section 231 is connected to the connection part 3, one end of the fourth pipe section 232 is connected to the second header 21, and the second connection section 233 connects the other end of the third pipe section 231 and the other end of the fourth pipe section 232.
[0028] In this embodiment, the length directions of the third pipe section 231 and the fourth pipe section 232 are substantially perpendicular to the axial direction of the second header 21. Similarly, the third pipe section 231 and the fourth pipe section 232 can be microchannel flat tubes, or circular tubes with a small diameter, etc. Their structures can be preset according to different heat exchange requirements and usage scenarios. Therefore, the types and structures thereof are not specifically limited in this article. In addition, similar to the structure of the first heat exchange part 1, the combined shape of the third pipe section 231, the fourth pipe section 232 and the second communication section 233 is generally U-shaped. Generally speaking, the third pipe section 231, the fourth pipe section 232 and the second communication section 233 are of an integral structure.
[0029] In addition, it should be noted that along the height direction of the heat exchanger, the second row of second heat exchange tubes 23 can be completely flush with the first row of first heat exchange tubes 13, or they can be staggered. Specifically, when the heat exchanger does not require fins for heat exchange, the second heat exchange tubes 23 can be arranged staggered with the first heat exchange tubes 13, so that the wind can directly reach the second heat exchange tubes 23. However, this will also increase the wind resistance. Therefore, generally speaking, the second heat exchange tubes 23 and the first heat exchange tubes 13 are substantially flush, which is also convenient for the installation of fins and reduces the wind resistance.
[0030] As Figure 2 shown, in a specific embodiment, the communication part 3 includes a first pipe 31. The pipe wall of the first pipe 31 is provided with a first opening 311 and at least one second opening 312. The second pipe section 132 extends into the first opening 311 and is connected to the first pipe 31, and the third pipe section 231 extends into the second opening 312 and is connected to the first pipe 31.
[0031] In this embodiment, the cross-sectional shape of the first pipe 31 can be circular, or other shapes such as square. Generally speaking, because the first pipe 31 with a circular cross-section has the smallest flow resistance, the first pipe 31 can be set as a hollow pipe with a circular cross-section. When the first heat exchange tubes 13 and the second heat exchange tubes 23 are microchannel flat tubes, in addition to connecting the second pipe section 132 and the third pipe section 231, the first pipe 31 can also be used to maintain the gaps between adjacent second pipe sections 132 and adjacent third pipe sections 231. This is because the diameter of the first pipe 31 is larger, and its outer wall can be closely attached between adjacent second pipe sections 132 and adjacent third pipe sections 231, so as to maintain the preset gaps and better maintain the structural stability of the heat exchanger.
[0032] As Figure 5 shown, in a specific embodiment, the number of the second heat exchange parts 2 is at least two. At least two second heat exchange parts 2 are located on the same side in the radial direction of the first header 11. The communication part 3 connects the second pipe section 132 and the second heat exchange tubes 23 of at least two second heat exchange parts 2.
[0033] When the number of the second heat exchange parts 2 is at least two, the heat exchanger includes at least three rows of heat exchange tubes (one row of the first heat exchange tubes 13 and at least two rows of the second heat exchange tubes 23). When the heat exchanger works, the refrigerant enters the first header 11, exchanges heat through the first heat exchange tubes 13, and then is shunted through the connecting part 3 into different second heat exchange parts 2 for heat exchange. Similarly, the multi-row connection method can make the heat exchange of the refrigerant in the heat exchanger more sufficient.
[0034] In a specific embodiment, the flow cross-sectional area of the first heat exchange tube 13 is defined as S1, the flow cross-sectional area of the second heat exchange tube 23 is defined as S2, and the number of the second heat exchange parts 2 is n. Then: S2 ≤ S1 ≤ nS2. Since one side of the first heat exchange tube 13 is the windward side and has the best heat exchange effect when the heat exchanger works, the flow cross-sectional area of the first heat exchange tube 13 can be set larger, so that the refrigerant flow rate in the first heat exchange tube 13 is more. And the heat exchange effect decreases after reaching the second heat exchange tubes 23 of the second heat exchange part 2, so the flow cross-sectional area of the second heat exchange tubes 23 can be reduced.
[0035] Taking the case where the number of heat exchange tubes of the heat exchanger is three rows as an example, the flow cross-sectional area of the first heat exchange tube 13 is greater than or equal to the flow cross-sectional area of the second heat exchange tube 23 and less than or equal to twice the flow cross-sectional area of the second heat exchange tube 23; when the number of heat exchange tubes of the heat exchanger is two rows, the flow cross-sectional area of the first heat exchange tube 13 is equal to the flow cross-sectional area of the second heat exchange tube 23.
[0036] As Figure 3 shown, in a specific embodiment, the connecting part 3 includes a third connecting section 32. The third connecting section 32 connects the second pipe section 132 and the third pipe section 231, and the third connecting section 32, the second pipe section 132 and the third pipe section 231 are of an integral structure. The integral third connecting section 32, second pipe section 132 and third pipe section 231 can reduce the costs such as welding and assembly of materials, making the integrity stronger. In addition, the integral third connecting section 32, second pipe section 132 and third pipe section 231 can also reduce the risk of liquid leakage at the connection.
[0037] As Figure 4 shown, in a specific embodiment, the connecting part 3 includes a second pipe 33, a third pipe 34 and a third heat exchange tube 35. The third heat exchange tube 35 is located between the first heat exchange tube 13 and the second heat exchange tube 23. The second pipe 33 connects one end of the second pipe section 132 and the third heat exchange tube 35, and the third pipe 34 connects the other end of the third pipe section 231 and the third heat exchange tube 35.
[0038] In this embodiment, the heat exchanger actually includes three rows of heat exchange tubes, namely, the first heat exchange tube 13 in the first row, the third heat exchange tube 35 in the second row, and the second heat exchange tube 23 in the third row. The first heat exchange tube 13, the third heat exchange tube 35, and the second heat exchange tube 23 are connected in series. When the heat exchanger works, the refrigerant enters the first header 11, exchanges heat through the first heat exchange tube 13, then enters the third heat exchange tube 35 through the second tube 33 for heat exchange, and finally enters the second heat exchange tube 23 through the third tube 34 for heat exchange. The multi-row connection method can make the heat exchange of the refrigerant in the heat exchanger more sufficient.
[0039] As Figure 4 shown, in a specific embodiment, the third heat exchange tube 35 includes a fifth tube section 351, a sixth tube section 352, and a fourth connecting section 353. The fifth tube section 351 and the sixth tube section 352 are arranged at intervals along the axial direction of the first header 11. The second tube 33 connects one end of the second tube section 132 and the fifth tube section 351, the third tube 34 connects one end of the third tube section 231 and the sixth tube section 352, and the fourth connecting section 353 connects the other end of the fifth tube section 351 and the other end of the sixth tube section 352.
[0040] In this embodiment, the structure of the third heat exchange tube 35 can be similar to the structures of the first heat exchange tube 13 and the second heat exchange tube 23, that is, the length directions of the fifth tube section 351 and the sixth tube section 352 are substantially perpendicular to the axial direction of the first header 11. Similarly, the fifth tube section 351 and the sixth tube section 352 can be microchannel flat tubes or round tubes with small diameters, etc. The combined shape of the fifth tube section 351, the sixth tube section 352, and the fourth connecting section 353 is generally U-shaped and is an integral structure. The third heat exchange tube 35 with this structure can also increase the path length of the refrigerant flowing in the heat exchanger, thereby making the heat exchange of the refrigerant in the heat exchanger more sufficient.
[0041] As Figures 5-6 and Figure 7 shown, in a specific embodiment, the first header 11 includes a first tube cavity 111 and a second tube cavity 112. The first tube cavity 111 and the second tube cavity 112 are arranged along the axial direction of the first header 11. The first interface 12 includes a first sub-interface 121 and a second sub-interface 122. The first sub-interface 121 is connected to the first tube cavity 111, and the second sub-interface 122 is connected to the second tube cavity 112.
[0042] In addition, the second header 21 includes a third tube cavity 211 and a fourth tube cavity 212. The third tube cavity 211 and the fourth tube cavity 212 are arranged along the axial direction of the second header 21. The second interface 22 includes a third sub-interface 221 and a fourth sub-interface 222. The third sub-interface 221 is connected to the third tube cavity 211, and the fourth sub-interface 222 is connected to the fourth tube cavity 212.
[0043] When the volume of the heat exchanger is relatively large, the lengths of the corresponding first header 11 and second header 21 will also be longer. Although the number of heat exchange tubes communicating with the first header 11 and the second header 21 in this embodiment is reduced, when the lengths of the first header 11 and the second header 21 are relatively long, the number of heat exchange tubes communicating with each of them is still not small, which will increase the difficulty of evenly distributing the refrigerant. Therefore, in this case, the first header 11 can be divided into a first pipe cavity 111 and a second pipe cavity 112, and then first sub-ports 121 and second sub-ports 122 are provided in the corresponding pipe cavities to separately distribute the first pipe cavity 111 and the second pipe cavity 112 of the first header 11, thereby reducing the distribution requirement of the refrigerant by the heat exchanger and making it easier to achieve the even distribution of the refrigerant.
[0044] As Figure 7 shown, in a specific embodiment, the heat exchanger further includes a distribution member (not shown in the figure) and fins 4. At least part of the distribution member is located inside the first header 11, and the length direction of the distribution member extends along the axial direction of the first header 11. The fins 4 are located on at least part of the first heat exchange tubes 13 and / or at least part of the second heat exchange tubes 23. It should be noted that the distribution member can be a distribution pipe, a distribution partition, etc. Generally speaking, as long as the first header 11 is within a suitable range, the arrangement of the first heat exchange tubes 13 in this embodiment can be evenly distributed, so the distribution member is not very necessary. When the length of the first header 11 is very long and it is difficult to distribute the refrigerant to each of the first heat exchange tubes 13, the method of dividing the first header 11 into a first pipe cavity 111 and a second pipe cavity 112 can be selected to improve the distribution performance, or the method of adding a distribution member for distribution can be selected to improve the distribution performance. This is not specifically limited in this article. In addition, the fins 4 mentioned in this embodiment can be corrugated fins, finned tubes with through holes, or transverse inserted fins with slots, etc.
[0045] In addition, the "at least part" in that at least part of the distribution member is located inside the first header 11 should be understood in a broad sense, that is, the distribution member can be completely located inside the first header 11, or only a part of it is located inside the first header 11 and the other part extends beyond the inner cavity of the first header 11. This is not specifically limited in this article.
[0046] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A heat exchanger, characterized in that: The invention comprises a first heat exchange part (1), a second heat exchange part (2) and a plurality of connecting parts (3), wherein the first heat exchange part (1) comprises a first header (11) and a plurality of first heat exchange tubes (13), the first header (11) has a first interface (12), the first interface (12) is connected to the first header (11), the first heat exchange tube (13) comprises a first tube segment (131), a second tube segment (132) and a first connecting section (133), the first tube segment (131) and the second tube segment (132) are arranged at intervals along the axial direction of the first header (11), one end of the first tube segment (131) is connected to the first header (11), and the first connecting section (133) is connected to the other end of the first tube segment (131) and one end of the second tube segment (132); the second heat exchange part (2) is located on one side of the radial direction of the first header (11), and the connecting part (3) is connected to the other end of the second tube segment (132) and the second heat exchange part (2).
2. The heat exchanger according to claim 1, characterized in that The second heat exchange portion (2) includes a second header (21) and a plurality of second heat exchange tubes (23). The second header (21) has a second interface (22), and the second interface (22) is connected to the second header (21). The second heat exchange tube (23) includes a third tube segment (231), a fourth tube segment (232) and a second connecting segment (233). The third tube segment (231) and the fourth tube segment (232) are arranged at intervals along the axial direction of the second header (21). One end of the third tube segment (231) is connected to the connecting portion (3), and one end of the fourth tube segment (232) is connected to the second header (21). The second connecting segment (233) is connected to the other end of the third tube segment (231) and the other end of the fourth tube segment (232).
3. The heat exchanger according to claim 2, characterized in that The connecting portion (3) comprises a first tube (31), the tube wall of the first tube (31) being provided with a first opening (311) and at least one second opening (312), the second tube section (132) extending into the first opening (311) and communicating with the first tube (31), and the third tube section (231) extending into the second opening (312) and communicating with the first tube (31).
4. The heat exchanger according to claim 2 or 3, characterized in that The number of the second heat exchange parts (2) is at least two, and at least two of the second heat exchange parts (2) are located on the same radial side of the first header (11). The connecting part (3) connects the second pipe section (132) and the second heat exchange tubes (23) of at least two of the second heat exchange parts (2).
5. The heat exchanger according to claim 4, characterized in that The flow cross-sectional area of the first heat exchange tube (13) is defined as S1, the flow cross-sectional area of the second heat exchange tube (23) is defined as S2, and the number of the second heat exchange parts (2) is n, then: S2≤S1≤nS2.
6. The heat exchanger according to claim 2, characterized in that The connecting portion (3) comprises a third connecting section (32), the third connecting section (32) connecting the second pipe section (132) and the third pipe section (231), and the third connecting section (32), the second pipe section (132) and the third pipe section (231) are an integrated structure.
7. The heat exchanger according to claim 2, characterized in that The connecting portion (3) comprises a second tube (33), a third tube (34) and a third heat exchange tube (35); the third heat exchange tube (35) is located between the first heat exchange tube (13) and the second heat exchange tube (23); the second tube (33) connects the second tube section (132) and one end of the third heat exchange tube (35); and the third tube (34) connects the third tube section (231) and the other end of the third heat exchange tube (35).
8. The heat exchanger according to claim 7, characterized in that The third heat exchange tube (35) comprises a fifth tube segment (351), a sixth tube segment (352) and a fourth connecting segment (353); the fifth tube segment (351) and the sixth tube segment (352) are arranged at intervals along the axial direction of the first header (11); the second tube (33) connects the second tube segment (132) and one end of the fifth tube segment (351); the third tube (34) connects the third tube segment (231) and one end of the sixth tube segment (352); and the fourth connecting segment (353) connects the other end of the fifth tube segment (351) and the other end of the sixth tube segment (352).
9. The heat exchanger according to any one of claims 1-3 or 5-8, characterized in that: The first manifold (11) includes a first lumen (111) and a second lumen (112), the first lumen (111) and the second lumen (112) being arranged along the axial direction of the first manifold (11), the first interface (12) including a first sub-interface (121) and a second sub-interface (122), the first sub-interface (121) being in communication with the first lumen (111), and the second sub-interface (122) being in communication with the second lumen (112).
10. The heat exchanger according to any one of claims 2-3 or 5-8, characterized in that: The second manifold (21) includes a third lumen (211) and a fourth lumen (212), and the third lumen (211) and the fourth lumen (212) are arranged along the axial direction of the second manifold (21). The second interface (22) includes a third sub-interface (221) and a fourth sub-interface (222), and the third sub-interface (221) is communicated with the third lumen (211), and the fourth sub-interface (222) is communicated with the fourth lumen (212).