Double-row heat exchanger

Abstract

The double-row heat exchanger comprises a first heat exchanger body and a second heat exchanger body, the first heat exchanger body comprises a plurality of first heat exchange pipes and first fins, the first heat exchange pipes are arranged at intervals, and the first fins are located between at least part of the adjacent first heat exchange pipes; the second heat exchanger is located on one side, in the thickness direction, of the first heat exchanger, the second heat exchanger comprises a plurality of second heat exchange pipes and second fins, the second heat exchange pipes are arranged at intervals, and the second fins are located between at least part of the adjacent second heat exchange pipes; the maximum length of the first fins arranged on the first heat exchange tube is defined as L1, the maximum length of the second fins arranged on the second heat exchange tube is defined as L2, and L1 is smaller than L2; when the double-row heat exchanger is used as an evaporator or a heat pump outdoor heat exchanger, the heat exchange efficiency can be improved.

Description

Technical Field

[0001] The present application relates to the field of heat exchange technology, and in particular to a double-row heat exchanger. Background Art

[0002] When the double-row heat exchanger is used as an evaporator or a heat pump outdoor heat exchanger, in order to reduce compressor liquid hammer, the refrigerant at the outlet of the double-row heat exchanger needs to be superheated. In the related art, the double-row heat exchanger is mostly composed of two heat exchangers of the same size, and the first row heat exchanger is flush with the second row heat exchanger. When such a double-row heat exchanger is used as an evaporator or a heat pump outdoor heat exchanger, the inlet air of the second row heat exchanger has passed through the first row heat exchanger, so the inlet air temperature of the second row heat exchanger is lower than that of the first row heat exchanger. More heat exchange area at the end of the second row heat exchanger is required to achieve refrigerant superheating, which reduces the heat exchange efficiency. Utility Model Content

[0003] An embodiment of the present application provides a double-row heat exchanger, which can improve heat exchange efficiency when used as an evaporator or a heat pump outdoor heat exchanger.

[0004] The double-row heat exchanger provided in the embodiment of the present application includes:

[0005] A first heat exchanger, wherein the first heat exchanger comprises a first heat exchange tube and a first fin, wherein the first heat exchange tube is in a plurality and the plurality of first heat exchange tubes are arranged at intervals, and the first fin is located between at least a portion of adjacent first heat exchange tubes;

[0006] The second heat exchanger is located on one side of the first heat exchanger along the thickness direction, the second heat exchanger includes a second heat exchange tube and a second fin, the number of the second heat exchange tubes is multiple, the multiple second heat exchange tubes are arranged at intervals, and the second fins are located between at least partially adjacent second heat exchange tubes; the maximum length of the first fin arranged on the first heat exchange tube is defined as L1, and the maximum length of the second fin arranged on the second heat exchange tube is defined as L2, then L1<L2.

[0007] The beneficial effects of the embodiments of the present application are:

[0008] The double-row heat exchanger provided in the embodiment of the present application includes a first heat exchanger and a second heat exchanger. The first heat exchange tube of the first heat exchanger is provided with a first fin, and the second heat exchange tube of the second heat exchanger is provided with a second fin. Since the maximum length L1 of the first fin arranged on the first heat exchange tube is less than the maximum length L2 of the second fin arranged on the second heat exchange tube, the first heat exchanger will form an area without the first fin at at least one end along the length direction of the first heat exchange tube. Fresh air can be directly blown to the second heat exchanger through the area to exchange heat with the second heat exchanger, thereby improving the heat exchange effect of the second heat exchanger at the corresponding position of the area, thereby reducing the heat exchange area required for refrigerant superheating when the double-row heat exchanger is used as an evaporator or a heat pump outdoor heat exchanger, thereby improving the heat exchange efficiency.

[0009] In addition, the double-row heat exchanger provided in the embodiment of the present application may also have the following additional technical features:

[0010] In an optional solution, the first heat exchanger includes a first header and a second header, the first header and the second header are arranged at intervals, and a plurality of the first heat exchange tubes are connected to the first header and the second header;

[0011] The second heat exchanger comprises a third header and a fourth header, the third header is arranged at an interval from the fourth header, and a plurality of the second heat exchange tubes are connected to the third header and the fourth header;

[0012] The double-row heat exchanger further includes a first tube, which is connected to the second header and the third header.

[0013] In an optional solution, the length direction of the first heat exchange tube is defined as a first direction, the length direction of the second heat exchange tube extends along the first direction, the first header is arranged adjacent to the third header, and the fourth header is arranged adjacent to the second header.

[0014] In an optional solution, when the double-row heat exchanger is in working state, the second header is located above the first header in the first direction, and the fourth header is located above the third header in the first direction; the side of the first heat exchange tube away from the second heat exchange tube is the air inlet side.

[0015] In an optional solution, the length of the first heat exchange tube is defined as L3, and the length of the second heat exchange tube is defined as L4, then: L3 = L4;

[0016] The first heat exchange tube includes a first sub-tube segment and a second sub-tube segment, one end of the first sub-tube segment is connected to the first header, and the other end is connected to one end of the second sub-tube segment, the other end of the second sub-tube segment is connected to the second header, and the first fin is located in the first sub-tube segment.

[0017] In an optional solution, at least part of the second sub-tube segment also includes a rotating segment, and the length direction of the rotating segment extends along the length direction of the second sub-tube segment; the angle formed between the width direction of the rotating segment and the width direction of the second sub-tube segment is defined as α, then: 0°<α≤45°.

[0018] In an optional solution, the maximum length L1 of the first fin on the first heat exchange tube and the length L3 of the first heat exchange tube satisfy the following relationship: 1 / 4≤(L3-L1) / L3≤1 / 5.

[0019] In an optional solution, the length of the first heat exchange tube is defined as L3', and the length of the second heat exchange tube is defined as L4', then: L3'<L4';

[0020] In the first direction, the height of the second header is lower than the height of the fourth header.

[0021] In an optional solution, the double-row heat exchanger further comprises a first plate, the first plate comprises a first side and a second side, the first side is connected to the second header, and the second side is connected to the fourth header;

[0022] The first plate includes one or more first holes, and the first holes penetrate the first plate along a thickness direction of the first plate.

[0023] In an optional solution, the length L3' of the first heat exchange tube and the length L4' of the second heat exchange tube satisfy: 1 / 4≤(L4'-L3') / L4'≤1 / 5.

[0024] In an optional solution, the double-row heat exchanger further includes a distribution pipe, the distribution pipe is located in the first header and / or the third header, the distribution pipe includes a plurality of distribution holes, and the plurality of distribution holes are arranged at intervals along the length direction of the distribution pipe.

[0025] It should be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of the structure of a double-row heat exchanger provided in the present application in a specific embodiment;

[0027] Figure 2 for Figure 1 A schematic diagram of a partial cross-sectional structure;

[0028] Figure 3 for Figure 1A schematic diagram of the structure of the double-row heat exchanger in working state;

[0029] Figure 4 A schematic structural diagram of a double-row heat exchanger provided in the present application in a second specific embodiment;

[0030] Figure 5 for Figure 4 A schematic diagram of the planar structure of a double-row heat exchanger on one side;

[0031] Figure 6 for Figure 4 A schematic diagram of the planar structure of the double-row heat exchanger on the other side;

[0032] Figure 7 A schematic structural diagram of a double-row heat exchanger provided in the present application in a third specific embodiment;

[0033] Figure 8 for Figure 7 A schematic diagram of the planar structure of a double-row heat exchanger on one side;

[0034] Fig. 9 for Figure 7 A schematic diagram of the planar structure of the double-row heat exchanger on the other side;

[0035] Fig.10 A schematic diagram of the structure of the double-row heat exchanger provided in the present application in a fourth specific embodiment;

[0036] Fig.11 for Fig.10 A schematic diagram of the planar structure of a double-row heat exchanger on one side;

[0037] Fig.12 for Fig.10 Schematic diagram of the planar structure of the double-row heat exchanger on the other side.

[0038] Figure numerals: first heat exchanger 1, first heat exchange tube 11, first sub-tube segment 111, second sub-tube segment 112, rotating segment 113, first fin 12, first header 13, first interface 131, second header 14, second heat exchanger 2, second heat exchange tube 21, second fin 22, third header 23, fourth header 24, second interface 241, first tube 3, first plate 4, first side 41, second side 42, first hole 43.

[0039] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application. Implementation

[0040] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0041] It should be clear that the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0042] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0043] It should be understood that the term "and / or" used in this article is only 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 at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0044] It should be noted that the directional words such as "upper", "lower", "left", and "right" described in the embodiments of the present application are described at the angles shown in the accompanying drawings and should not be understood as limiting the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to another element "upper" or "lower", but also indirectly connected to another element "upper" or "lower" through an intermediate element.

[0045] An embodiment of the present application provides a double-row heat exchanger. This article uses the double-row heat exchanger used in the evaporator of an air-conditioning system or the outdoor heat exchanger of a heat pump as an example to describe the technical solution and technical effects. Of course, the application field of the double-row heat exchanger in the embodiment of the present application is not limited to the description in this article, and can also be used in other systems, such as water heaters, automobiles and other systems.

[0046] The heat transfer performance of the microchannel heat exchanger is significantly improved compared to the copper tube aluminum fin heat exchanger. Compared with the copper tube fin heat exchanger with more rows, when the capacity of a single-row microchannel heat exchanger is insufficient, the number of heat exchanger rows contained in the microchannel heat exchanger can usually be increased to meet the heat transfer requirements, such as a double-row heat exchanger.

[0047] like Figure 1-12As shown, the double-row heat exchanger provided in the embodiment of the present application includes a first heat exchanger 1 and a second heat exchanger 2, wherein the first heat exchanger 1 includes a first heat exchange tube 11 and a first fin 12, the number of the first heat exchange tube 11 is multiple, the multiple first heat exchange tubes 11 are arranged at intervals, and the first fin 12 is located between at least part of the adjacent first heat exchange tubes 11. Generally speaking, except for the two outermost heat exchange tubes, the other two adjacent heat exchange tubes are provided with fins. The second heat exchanger 2 is located on one side of the first heat exchanger 1 along the thickness direction, and the second heat exchanger 2 includes a second heat exchange tube 21 and a second fin 22. The number of the second heat exchange tube 21 is multiple, the multiple second heat exchange tubes 21 are arranged at intervals, and the second fin 22 is located between at least part of the adjacent second heat exchange tubes 21; the maximum length of the first fin 12 arranged on the first heat exchange tube 11 is defined as L1, and the maximum length of the second fin 22 arranged on the second heat exchange tube 21 is defined as L2, then L1<L2.

[0048] In this embodiment, the double-row heat exchanger includes a first heat exchanger 1 and a second heat exchanger 2. The first heat exchanger 1 includes a first heat exchange tube 11 and a first fin 12, and the second heat exchanger 2 includes a second heat exchange tube 21 and a second fin 22. Since the maximum length L1 of the first fin 12 arranged on the first heat exchange tube 11 is less than the maximum length L2 of the second fin 22 arranged on the second heat exchange tube 21, the first heat exchanger 1 will form an area without the first fin 12 at at least one end along the length direction of the first heat exchange tube 11. Fresh air can be directly blown to the second heat exchanger 2 through the area to directly exchange heat with the second heat exchanger 2, thereby improving the heat exchange effect of the second heat exchanger 2 at the corresponding position of the area, thereby reducing the heat exchange area required for refrigerant superheating when the double-row heat exchanger is used as an evaporator or a heat pump outdoor heat exchanger, thereby improving the heat exchange efficiency.

[0049] It should be noted that, in this embodiment, the length of the first heat exchange tube 11 and the length of the second heat exchange tube 21 may be the same or different (the specific embodiment will be described in detail below). When the lengths of the two are the same, the maximum length L1 of the first fin 12 arranged on the first heat exchange tube 11 is less than the maximum length L2 of the second fin 22 arranged on the second heat exchange tube 21, indicating that at least one section of the first heat exchange tube 11 is not equipped with the first fin 12, so the fresh air can directly reach the second heat exchange tube 21 through this section. In addition, when the lengths of the first heat exchange tube 11 and the second heat exchange tube 21 are different, no matter the first heat exchange tube 11 is longer or the second heat exchange tube 21 is longer, since there is a length difference between the fins therebetween and the maximum length L1 of the first fin 12 arranged on the first heat exchange tube 11 is less than the maximum length L2 of the second fin 22 arranged on the second heat exchange tube 21, there is always an area where fresh air can be directly blown to the second heat exchange tube 21 through the first heat exchange tube 11 of the first heat exchanger 1, thereby reducing the heat exchange area required for the second heat exchanger 2 to achieve refrigerant superheating.

[0050] In addition, it should be supplemented that the combination of the first heat exchanger 1 and the second heat exchanger 2 can be arranged at an angle, such as a V-shaped arrangement, or can be arranged relatively in parallel; the first heat exchange tube 11 and the second heat exchange tube 21 can be single-channel heat exchange tubes or microchannel heat exchange tubes; the first fins 12 and the second fins 22 can be corrugated fins arranged along the length direction of the first heat exchange tube 11 / second heat exchange tube 21, or can be horizontally inserted fins inserted between two adjacent first heat exchange tubes 11 / second heat exchange tubes 21 along the direction of their interval arrangement, and this article does not make specific limitations on this.

[0051] like Figure 1-3 As shown, in a specific embodiment, the first heat exchanger 1 includes a first header 13 and a second header 14, the first header 13 and the second header 14 are arranged at intervals, a plurality of first heat exchange tubes 11 are connected to the first header 13 and the second header 14, a first interface 131 is provided on the first header 13, and when the double-row heat exchanger is used as an evaporator or a heat pump outdoor heat exchanger, the first interface 131 is the inlet of the refrigerant. The second heat exchanger 2 includes a third header 23 and a fourth header 24, the third header 23 and the fourth header 24 are arranged at intervals, a plurality of second heat exchange tubes 21 are connected to the third header 23 and the fourth header 24, a second interface 241 is provided on the fourth header 24, and when the double-row heat exchanger is used as an evaporator or a heat pump outdoor heat exchanger, the second interface 241 is the outlet of the refrigerant.

[0052] In addition, the double-row heat exchanger further includes a first tube 3, which is connected to the second header 14 and the third header 23. If the length direction of the first heat exchange tube 11 is defined as the first direction, the length direction of the second heat exchange tube 21 extends along the first direction, that is, the first heat exchange tube 11 and the second heat exchange tube 21 are arranged in the same direction; the first header 13 is arranged adjacent to the third header 23, and the fourth header 24 is arranged adjacent to the second header 14. It should be noted that the adjacent arrangement mentioned in this embodiment means that the first header 13 is adjacent to the third header 23, and the fourth header 24 is adjacent to the second header 14. There can be a certain distance or interval between them, and they are not necessarily completely close.

[0053] In this embodiment, the length directions of the first heat exchange tube 11 and the second heat exchange tube 21 are in the same direction, which means that the first heat exchanger 1 and the second heat exchanger 2 are arranged side by side in parallel. Compared with the angled arrangement, such an arrangement can save more installation space and reduce the wind attenuation when the cold air is blown to the second row of heat exchangers. When the double-row heat exchanger is used as an evaporator or a heat pump outdoor heat exchanger, the refrigerant enters from the first header 13 through the first interface 131, flows through multiple first heat exchange tubes 11 for heat exchange and then converges into the second header 14, then enters the third header 23 through the first tube 3, then flows through multiple second heat exchange tubes 21 for heat exchange and flows into the fourth header 24, and finally flows out from the second interface 214 of the fourth header 24, completing a cycle of the refrigerant.

[0054] In another specific embodiment, in order to achieve a better heat exchange effect, when the double-row heat exchanger is in working state, the second header 14 is located above the first header 13 in the first direction, and the fourth header 24 is located above the third header 23 in the first direction; the side of the first heat exchange tube 11 away from the second heat exchange tube 21 is the air inlet side, and this arrangement can make the length direction of the first heat exchange tube 11 and the second heat exchange tube 21 face the vertical direction, so as to have better drainage. In addition, the double-row heat exchanger also includes a distribution pipe, which is located at the first header 13 and / or the third header 23, and includes a plurality of distribution holes, and the plurality of distribution holes are arranged at intervals along the length direction of the distribution pipe.

[0055] When the double-row heat exchanger is used as an evaporator or a heat pump outdoor heat exchanger, the first row of heat exchangers (i.e., the first heat exchanger 1) is evenly distributed on the windward side, while the second row of heat exchangers (i.e., the second heat exchanger 2) is often poorly distributed on the leeward side. By introducing fresh air and performing secondary distribution through the distribution pipe, the refrigerant in both rows moves from bottom to top, following the law of gasification, i.e., the liquid has a large density, the gas has a small density, the evaporation process is from bottom to top, and the density decreases from bottom to top. In addition, since fresh air is introduced into the second row, at a certain amount of fresh air, the inlet air temperature is high, and the regional boundary of the two-phase state of the refrigerant in the second row will move upward, resulting in a larger effective heat exchange area. By adjusting the distribution pipe holes at the bottom, the distribution of the refrigerant in the second row is more uniform and stable, and the efficiency is improved.

[0056] like Figure 1-6 As shown, in a specific embodiment, if the length of the first heat exchange tube 11 is defined as L3, and the length of the second heat exchange tube 21 is defined as L4, then: L3=L4; the first heat exchange tube 11 includes a first sub-tube segment 111 and a second sub-tube segment 112, one end of the first sub-tube segment 111 is connected to the first header 13, and the other end is connected to one end of the second sub-tube segment 112, the other end of the second sub-tube segment 112 is connected to the second header 14, and the first fin 12 is located in the first sub-tube segment 111.

[0057] In this embodiment, the length of the first heat exchange tube 11 is equal to the length of the second heat exchange tube 21, indicating that the sizes of the first heat exchanger 1 and the second heat exchanger 2 are roughly the same. Therefore, in order to satisfy the maximum length L1 of the first fin 12 arranged on the first heat exchange tube 11 is less than the maximum length L2 of the second fin 22 arranged on the second heat exchange tube 21, it is necessary to form a "finless area" on the first heat exchange tube 11, through which the fresh air can be directly blown to the second heat exchange tube 21. In order to achieve a better ventilation effect, in this embodiment, the finless area is concentrated in the second sub-tube segment 112. When the heat exchanger is working, the second sub-tube segment 112 is located above the first sub-tube segment 111.

[0058] It should be noted that in the embodiment of the present application, the first heat exchange tube 11 is divided into a first sub-segment 111 and a second sub-segment 112, which does not mean that the first heat exchange tube 11 is formed by splicing or combining the first sub-segment 111 and the second sub-segment 112, but is only an easy-to-understand statement based on their positional relationship. Generally speaking, the first sub-segment 111 and the second sub-segment 112 are just different position parts of the same first heat exchange tube 11, and the first sub-segment 111 and the second sub-segment 112 are integrally formed.

[0059] like Figure 4-6As shown, in a specific embodiment, at least part of the second sub-tube segment 112 also includes a rotating segment 113, and the length direction of the rotating segment 113 extends along the length direction of the second sub-tube segment 112; the angle formed between the width direction of the rotating segment 113 and the width direction of the second sub-tube segment 112 is defined as α, then: 0°<α≤45°.

[0060] As mentioned above, since part of the second sub-segment 112 is not provided with fins, the contact area between this part of the segment and the air will be smaller than the part with fins in the first sub-segment 111, and the heat exchange effect will be slightly worse than that of the part of the first sub-segment 111. Therefore, after the second sub-segment 112 is rotated to a certain extent, the contact area between the second sub-segment 112 and the fresh air can be increased, thereby improving the heat exchange effect when the refrigerant flows through the second sub-segment 112. In addition, the shielding of the fresh air by the rotating section 113 is much smaller than that by the fins, so the rotating section 113 can still allow the fresh air to pass through, thereby ensuring the superheating effect of the second heat exchanger 2 at this section.

[0061] In addition, the length ratio of the first sub-segment 111 and the second sub-segment 112 is also the key to balancing the heat exchange efficiency and the superheating effect. For example, when the first sub-segment 111 is too long and the second sub-segment 112 is too short, the area formed by the first heat exchanger 1 for the fresh air to pass through is small, which affects the superheating effect of the second heat exchanger 2; when the first sub-segment 111 is too short and the second sub-segment 112 is too long, there is a longer section on the first heat exchanger 1 without fins, which affects the overall heat exchange efficiency. Therefore, when the maximum length L1 of the first fin 12 on the first heat exchange tube 11 and the length L3 of the first heat exchange tube 11 satisfy the following relationship: 1 / 4≤(L3-L1) / L3≤1 / 5, it can be ensured that the double-row heat exchanger has a relatively balanced heat exchange efficiency and superheating effect.

[0062] like Figure 7-12 As shown, in a specific embodiment, if the length of the first heat exchange tube 11 is defined as L3', and the length of the second heat exchange tube 21 is defined as L4', then: L3'<L4'; in the first direction, the height of the second header 14 is lower than the height of the fourth header 24. When the length of the first heat exchange tube 11 is less than the length of the second heat exchange tube 21, no matter how the first fins 12 and the second fins 22 are arranged on the first heat exchange tube 11 and the second heat exchange tube 21, the length of the first fin 12 can always be lower than the second fin 22, thereby forming an area for fresh air to pass through.

[0063] like Figure 10-12As shown, in a specific embodiment, the double-row heat exchanger also includes a first plate 4, the first plate 4 includes a first side 41 and a second side 42, the first side 41 is connected to the second header 14, and the second side 42 is connected to the fourth header 24; the first plate 4 includes a first hole 43, the number of the first hole 43 is one or more, and the first hole 43 penetrates the first plate 4 along the thickness direction of the first plate 4. It should be noted that the function of the first plate 4 is to connect the first heat exchanger 1 and the second heat exchanger 2, so that the two are connected to each other on the side that is not aligned so as to make the connection more stable. In addition, the first plate 4 can also prevent the fan of the double-row heat exchanger from blowing foreign objects into the space between the two rows of heat exchangers when the double-row heat exchanger is working. The opening area of ​​the first hole 43 is generally larger than half of the area of ​​the first plate 4, so that the air intake can be increased to ensure the heat exchange efficiency of the second heat exchanger 2. The shape of the first hole 43 can be a circular hole, a waist-shaped hole or a long strip hole, which is not specifically limited in this article.

[0064] In addition, when the first heat exchange tube 11 is too long, it will affect the superheating effect of the second heat exchanger 2, but when the first heat exchange tube 11 is too short, the flow path of the first heat exchanger 1 will be too short, affecting the heat exchange efficiency. Therefore, in order to balance the heat exchange efficiency and superheating effect of the double-row heat exchanger, the length L3' of the first heat exchange tube 11 and the length L4' of the second heat exchange tube 21 satisfy: 1 / 4≤(L4'-L3') / L4'≤1 / 5.

[0065] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A double-row heat exchanger, characterized in that: include: A first heat exchanger (1), the first heat exchanger (1) comprising a first heat exchange tube (11) and a first fin (12), the first heat exchange tube (11) being provided in a plurality, the plurality of first heat exchange tubes (11) being arranged at intervals, and the first fin (12) being located between at least a portion of adjacent first heat exchange tubes (11); A second heat exchanger (2), wherein the second heat exchanger (2) is located on one side of the first heat exchanger (1) along the thickness direction, the second heat exchanger (2) comprises a second heat exchange tube (21) and a second fin (22), the number of the second heat exchange tube (21) is multiple, the multiple second heat exchange tubes (21) are arranged at intervals, and the second fin (22) is located between at least partially adjacent second heat exchange tubes (21); the maximum length of the first fin (12) arranged on the first heat exchange tube (11) is defined as L1, and the maximum length of the second fin (22) arranged on the second heat exchange tube (21) is defined as L2, then L1<L2.

2. The double-row heat exchanger according to claim 1, characterized in that: The first heat exchanger (1) comprises a first header (13) and a second header (14), the first header (13) and the second header (14) are arranged at intervals, and a plurality of the first heat exchange tubes (11) are connected to the first header (13) and the second header (14); The second heat exchanger (2) comprises a third header (23) and a fourth header (24), the third header (23) and the fourth header (24) are arranged at intervals, and a plurality of the second heat exchange tubes (21) are connected to the third header (23) and the fourth header (24); The double-row heat exchanger further comprises a first tube (3), wherein the first tube (3) is connected to the second header (14) and the third header (23).

3. The double-row heat exchanger according to claim 2, characterized in that: The length direction of the first heat exchange tube (11) is defined as a first direction, the length direction of the second heat exchange tube (21) extends along the first direction, the first header (13) is arranged adjacent to the third header (23), and the fourth header (24) is arranged adjacent to the second header (14).

4. The double-row heat exchanger according to claim 3, characterized in that: When the double-row heat exchanger is in operation, the second header (14) is located above the first header (13) in the first direction, and the fourth header (24) is located above the third header (23) in the first direction; and the side of the first heat exchange tube (11) facing away from the second heat exchange tube (21) is the air inlet side.

5. The double-row heat exchanger according to any one of claims 2 to 4, characterized in that: The length of the first heat exchange tube (11) is defined as L3, and the length of the second heat exchange tube (21) is defined as L4, then: L3 = L4; The first heat exchange tube (11) comprises a first sub-tube segment (111) and a second sub-tube segment (112); one end of the first sub-tube segment (111) is connected to the first header (13), and the other end is connected to one end of the second sub-tube segment (112); the other end of the second sub-tube segment (112) is connected to the second header (14); and the first fin (12) is located in the first sub-tube segment (111).

6. The double-row heat exchanger according to claim 5, characterized in that: At least part of the second sub-tube segment (112) further comprises a rotating segment (113), the length direction of the rotating segment (113) extending along the length direction of the second sub-tube segment (112); an angle formed between a width direction of the rotating segment (113) and a width direction of the second sub-tube segment (112) is defined as α, then: 0°<α≤45°.

7. The double-row heat exchanger according to claim 5, characterized in that: The maximum length L1 of the first fin (12) on the first heat exchange tube (11) and the length L3 of the first heat exchange tube (11) satisfy the following relationship: 1 / 4≤(L3-L1) / L3≤1 / 5.

8. The double-row heat exchanger according to any one of claims 2 to 4, characterized in that: The length of the first heat exchange tube (11) is defined as L3', and the length of the second heat exchange tube (21) is defined as L4', then: L3'<L4'; In the first direction, the height of the second header (14) is lower than the height of the fourth header (24).

9. The double-row heat exchanger according to claim 8, characterized in that: The double-row heat exchanger further comprises a first plate (4), the first plate (4) comprising a first side edge (41) and a second side edge (42), the first side edge (41) being connected to the second header (14), and the second side edge (42) being connected to the fourth header (24); The first plate (4) comprises a first hole (43), the number of the first hole (43) is one or more, and the first hole (43) penetrates the first plate (4) along the thickness direction of the first plate (4).

10. The double-row heat exchanger according to claim 8, characterized in that: The length L3' of the first heat exchange tube (11) and the length L4' of the second heat exchange tube (21) satisfy the following relationship: 1 / 4≤(L4'-L3') / L4'≤1 / 5.

11. The double-row heat exchanger according to any one of claims 2 to 4 or 6 or 9, characterized in that: The double-row heat exchanger further comprises a distribution pipe, wherein the distribution pipe is located on the first header (13) and / or the third header (23), and the distribution pipe comprises a plurality of distribution holes, wherein the plurality of distribution holes are arranged at intervals along the length direction of the distribution pipe.

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