Heat exchanger and heat exchange system

Abstract

The utility model relates to a heat exchanger and a heat exchange system.The heat exchanger comprises two heat exchange units, each heat exchange unit comprises a plurality of heat exchange flat pipes arranged at intervals and a collecting pipe communicating with the heat exchange flat pipes, and the heat exchange flat pipes in the two heat exchange units are alternately arranged; each heat exchange flat pipe is provided with a flow channel folded back in the length direction of the heat exchange flat pipe, an inlet and an outlet of the flow channel are located at the same end, the number of the collecting pipes in the same heat exchange unit is two, the two collecting pipes correspondingly communicate with the inlet and the outlet, and the collecting pipes of the two heat exchange units are located on the two opposite sides of the heat exchanger. The appearance of the heat exchanger is more regular and compact, the collecting pipes are in a multi-section split butt joint mode, machining and assembling are more convenient, and different design requirements can be flexibly met.

Description

Technical Field

[0001] The present application relates to the technical field of heat exchange equipment, and particularly relates to a heat exchanger and a heat exchange system. Background Art

[0002] Dual systems, variable loads, and heat dissipation of multiple media will be one of the directions and ideas for improving the energy efficiency of refrigeration systems. Among them, the evaporator in the dual-loop refrigeration system is applied in multiple fields such as household, commercial, and industrial cooling.

[0003] The prior art three-medium microchannel heat exchanger includes two heat exchange units. Each heat exchange unit includes a plurality of flat tubes and two header pipes. The flat tubes are arranged in a single flow path. The two ends of the flat tubes are respectively connected to the header pipes, and the flat tubes of the two heat exchange units are arranged alternately along the length direction of the header pipes. The flat tubes of one heat exchange unit need to be bent to avoid the header pipes of the other heat exchange unit. However, due to the increased difficulty of bending the flat tubes, it is not conducive to the processing of the heat exchanger, and the overall structural compactness of the heat exchanger is not good. Utility Model Content

[0004] The present application provides a heat exchanger that is convenient for assembly and processing, can further improve the overall structural compactness of the heat exchanger, and is applicable to multi-medium heat exchange scenarios.

[0005] A heat exchanger of the present application includes two heat exchange units. Each of the heat exchange units includes a plurality of heat exchange flat tubes arranged at intervals, and header pipes connected to the plurality of heat exchange flat tubes. The heat exchange flat tubes in the two heat exchange units are arranged alternately;

[0006] The heat exchange flat tube has a flow channel that turns back along its own length direction, and the inlet and outlet of the flow channel are located at the same end. There are two header pipes in the same heat exchange unit, and the two header pipes correspondingly connect the inlet and the outlet, and the header pipes of the two heat exchange units are located on two opposite sides of the heat exchanger.

[0007] The following also provides several optional ways, but they are not additional limitations to the above general solution, but only further supplements or optimizations. Without technical or logical contradictions, each optional way can be combined with the above general solution alone, or multiple optional ways can be combined with each other.

[0008] In one embodiment, the header pipe includes a plurality of unit pipes connected in sequence, and each of the heat exchange flat tubes in the same heat exchange unit is connected to the corresponding unit pipe.

[0009] In one embodiment, the maximum distance between the two header pipes in the same heat exchange unit along the width direction of the heat exchange flat tube is l, and the width of the heat exchange flat tube is L. L and l satisfy: L>l.

[0010] In one embodiment, the centerlines of two of the header pipes (200) in the same heat exchange unit are arranged offset in the length direction of the flat heat exchange pipe (100), and the relationship between L and l satisfies:

[0011]

[0012] In one embodiment, each of the header pipes is provided with a connecting pipe, and all the connecting pipes in the heat exchanger are located on the same side of the heat exchanger; the corresponding connecting pipes in two heat exchange units are bent towards each other.

[0013] In one embodiment, among two of the connecting pipes in the same heat exchange unit, the diameter of one of the connecting pipes is OD1, and the diameter of the other connecting pipe is OD2; and it satisfies: OD1 < OD2 ≤ 1.56 * OD1.

[0014] In one embodiment, adjacent flat heat exchange pipes are thermally coupled through fins. Along the width direction of the flat heat exchange pipe, one side of the heat exchanger is the windward side where the air flow is upstream; the two heat exchange units independently serve as an evaporator or a condenser, and the inlet side is on the windward side.

[0015] In one embodiment, among a plurality of unit pipes, adjacent unit pipes are directly inserted and matched with each other, or an intermediate pipe is provided between adjacent unit pipes and they are interconnected through the intermediate pipe.

[0016] In one embodiment, among the adjacent unit pipe and the intermediate pipe, one of them is provided with a reduced-diameter portion and is inserted and matched with the other through the reduced-diameter portion.

[0017] In one embodiment, along the length direction of the header pipe, the length of the unit pipe is L1; the length of the intermediate pipe is L2, and it satisfies L1:L2 = 1:(0.5 - 2).

[0018] The present application further provides a heat exchange system, including the heat exchanger of the present application, wherein two heat exchange units are respectively connected to corresponding heat exchange media; each heat exchange unit independently uses a refrigerant or water as the heat exchange media.

[0019] The heat exchanger of the present application does not need to perform bending settings on the flat pipes, can realize the connection between the corresponding flat pipes and the header pipes of two heat exchange units, is convenient for assembly and processing, improves the overall structural compactness of the heat exchanger, and each header pipe adopts a multi-segment split docking method, which is more convenient for processing and assembly and can flexibly adapt to different design requirements. Description of the Drawings

[0020] To more clearly illustrate the technical solutions in the embodiments of the present application or in the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1 Structural schematic diagram of a heat exchanger in an embodiment of the present application;

[0022] Figure 2 For Figure 1 Structural schematic diagram of the heat exchanger in after omitting the fins;

[0023] Figure 3 For Figure 2 Enlarged view of part A in ;

[0024] Figure 4 Diameter schematic diagram of each joint pipe of the heat exchanger in an embodiment of the present application;

[0025] Figure 5 Spacing schematic diagram of each heat exchange flat tube of the heat exchanger in an embodiment of the present application;

[0026] Figure 6 Cooperation schematic diagram between multiple unit pipes in an embodiment of the present application;

[0027] Figure 7 For Figure 6 Enlarged schematic diagram of the unit pipe and the intermediate pipe in ;

[0028] Figure 8 Principle schematic diagram of a heat exchange system in an embodiment of the present application;

[0029] Figure 9 Principle schematic diagram of a heat exchange system in another embodiment of the present application.

[0030] The reference numerals of each element are as follows:

[0031] 100, heat exchange flat tube; 100a, first heat exchange flat tube; 100b, second heat exchange flat tube; 200, header pipe; 210, inlet pipe; 210a, first inlet pipe; 210b, second inlet pipe; 220, outlet pipe; 220a, first outlet pipe; 220b, second outlet pipe; 230, joint pipe; 230a, first joint pipe; 230b, second joint pipe; 230c, third joint pipe; 230d, fourth joint pipe; 240, unit pipe; 241, slot; 242, first reduced diameter portion; 250, intermediate pipe; 251, second reduced diameter portion; 300, fin. Detailed implementation manners

[0032] To make the above objects, features, and advantages of the present application more apparent and understandable, the following will provide a detailed description of the specific embodiments of the present application with reference to the accompanying drawings. Many specific details are set forth in the following description to facilitate a thorough understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0033] It should be noted that when a component is referred to as "fixed to" or "disposed on" another component, it can be directly on the other component or there may also be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of the present application are only for the purpose of illustration and do not represent the only implementation manner.

[0034] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0035] In the present application, unless otherwise clearly defined and limited, the first feature may be in direct contact with the second feature "on" or "under" the second feature, or the first feature and the second feature may be in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or only indicates that the first feature is at a higher horizontal height (or in a certain use state, or from a certain perspective of the drawing) than the second feature. The first feature being "below", "beneath" and "underneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or only indicates that the first feature is at a lower horizontal height (or in a certain use state, or from a certain perspective of the drawing) than the second feature.

[0036] Unless otherwise defined, all technical and scientific terms used in the specification of the present application have the same meaning as commonly understood by those skilled in the technical field to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "and / or" used in the specification of the present application includes any and all combinations of one or more of the related listed items.

[0037] See Figures 1 to 3, an embodiment of the present application provides a heat exchanger, which includes two heat exchange units. The two heat exchange units independently serve as an evaporator or a condenser, and can form a two-fluid path system. For example, different refrigerants are introduced into the two units, with a cold medium flowing through one side (serving as an evaporator) and a hot medium flowing through the other side (serving as a condenser); or the same refrigerant is introduced into both units, and both units are introduced with a hot medium (both serving as condensers); or the same refrigerant is introduced into both units, and both units are introduced with a cold medium (both serving as evaporators).

[0038] Each heat exchange unit includes a plurality of heat exchange flat tubes 100 arranged at intervals and a header pipe 200 communicated with the plurality of heat exchange flat tubes 100. The heat exchange flat tubes 100 in the two heat exchange units are alternately arranged. In terms of the heat exchange flat tube 100 itself, it can be combined with the existing technology. For example, the heat exchange flat tube 100 is plate-shaped as a whole and has a relative length direction L and width direction W.

[0039] The heat exchange flat tube 100 may include a first plate body and a second plate body that are buckled and fixed to each other, and a fluid channel for the heat exchange medium is formed between the two plate bodies. For example, the first plate body includes a first body and a first protrusion, and the first protrusion protrudes from the first body and forms a fluid channel with the second body. Or the second plate body includes a second body and a second protrusion, and the second protrusion protrudes from the second body and forms a fluid channel with the first body. Or the first plate body has a first protrusion, the second plate body has a second protrusion, and the first protrusion and the second protrusion form a fluid channel. The heat exchange flat tube 100 with such a structural feature can be applied to a microplate heat exchanger. The adjacent heat exchange flat tubes 100 can be thermally coupled through fins 300. Combining with the air flow passing through the fins 300, the heat exchanger of this embodiment can be used for three-medium heat exchange.

[0040] The heat exchange flat tube 100 has a flow channel that turns back along its own length direction, and the inlet and outlet of the flow channel are located at the same end. There are two header pipes 200 in the same heat exchange unit, and they are arranged on the same side of the length direction of the heat exchange flat tube 100. The two header pipes 200 correspondingly communicate with the inlet and outlet, and the header pipes 200 of the two heat exchange units are located on the two opposite sides of the heat exchanger.

[0041] A reasonable arrangement method of the header pipe 200 can further reduce the interference of its own space and improve the compactness of the overall structure of the heat exchanger. In this embodiment, the header pipe 200 adopts a split docking method. The header pipe 200 includes a plurality of unit pipes 240 that are sequentially communicated in its own extending direction. Slots 241 are opened on the side walls of each unit pipe 240, and each heat exchange flat tube 100 in the same heat exchange unit is communicated to the corresponding unit pipe 240 through the slots 241.

[0042] One of the two header pipes 200 in the same heat exchange unit serves as an inlet pipe 210, and the other serves as an outlet pipe 220. One side of the heat exchange flat tube 100 in the length direction is provided with an inlet and an outlet that are communicated with the internal fluid channel (Figure 3 The dashed arrows in it schematically show the direction of the heat exchange medium passing through the fluid channel via the inlet and outlet. Setting the inlet and outlet on the same side can increase the flow path in the heat exchange flat tube 100, which is beneficial to improving the heat exchange efficiency. The shapes of the heat exchange flat tube 100 converge at the inlet and outlet to form plug-in parts, and these plug-in parts are hermetically plugged into the slots 241 in the corresponding unit tubes 240, and can be fixed by means such as brazing.

[0043] The header pipe 200 of this embodiment includes multiple unit tubes 240, and the length of the unit tubes 240 can be flexibly adjusted according to the spacing of the heat exchange flat tubes 100. The inlets and outlets of the heat exchange flat tubes 100 are arranged on the same side, and the inlet pipe 210 and the outlet pipe 220 on this side are arranged side by side, making the overall structure more compact and beneficial to improving the heat exchange efficiency.

[0044] The arrangement of the two header pipes 200 in the same heat exchange unit in the width direction of the heat exchange flat tube 100 is as follows: the centers of the two header pipes 200 are aligned with each other; or, the centers of the two header pipes 200 are arranged staggeredly, and the sides facing the heat exchange flat tube 100 are flush with each other. In either case, in order to further optimize the layout, the two header pipes 200 have a first side and a second side that are away from each other, and neither the first side nor the second side exceeds the width boundary of the heat exchange flat tube 100. For example, the longest distance along the width direction of the heat exchange flat tube 100 between the two header pipes 200 in the same heat exchange unit is l, and the width of the heat exchange flat tube 100 is L, and L and l satisfy: L>l. This setting makes the overall structure of the heat exchanger compact and the appearance more regular, facilitating storage, transportation, stacking, and matching with the surrounding equipment in the usage environment.

[0045] In some preferred embodiments, the centerlines of the two header pipes 200 in the same heat exchange unit are arranged staggeredly in the length direction of the heat exchange flat tube 100, and the relationship between L and l satisfies:

[0046] Combined with Figure 4 , in the staggered arrangement of the centers of the two header pipes 200, since the diameters of the two header pipes 200 are different, their centers can be staggered from each other in the length direction of the heat exchange flat tube 100. According to the requirements of the space size, the two can be brought closer in the width direction of the heat exchange flat tube 100, making the overall structure of the heat exchanger more compact and facilitating the installation of the two header pipes 200 at the same time.

[0047] For heat exchangers of different specifications, L and l in the above text can be set in equal proportion. For example, when the diameter of each header pipe 200 decreases, the width of the heat exchange flat tube 100 decreases synchronously. Generally, the sum of the diameters of the two header pipes 200 is less than the width of the heat exchange flat tube 100, so that the two header pipes 200 do not protrude outside the heat exchange flat tube 100 in the width direction.

[0048] In order to facilitate the connection of external pipelines and equipment to form a heat exchange system, each manifold 200 is provided with a connecting pipe 230. All the connecting pipes 230 in the heat exchanger are located on the same side of the heat exchanger. As for the whole heat exchanger, there are four connecting pipes 230 in total, and the corresponding connecting pipes 230 in its two heat exchange units are bent towards each other. Such a setting can prevent the connecting pipes 230 from protruding beyond the manifolds 200 in the length direction of the heat exchange flat tubes 100, which is convenient for the pre-assembly of the connecting pipes 230 and still maintains the regularity of the overall appearance, reducing the occupied space.

[0049] When the heat exchanger of this embodiment is used as a three-medium heat exchanger, in addition to the corresponding configurations of the two heat exchange units, it is also possible to combine with the air flow direction at the fin 300 part. For example, along the width direction of the heat exchange flat tube 100, one side of the heat exchanger is the windward side where the air flow is upstream, and the air flow flows from the windward side to the other side of the fin 300.

[0050] In the heat exchange unit used as an evaporator, the diameter of the inlet pipe 210 is smaller than that of the outlet pipe 220, that is, the diameter of the inlet pipe 210 is smaller, because as the evaporator function, the specific volume of the medium flowing inside the inlet pipe 210 side is smaller than that on the outlet pipe 220 side.

[0051] In the heat exchange unit used as a condenser, the diameter of the inlet pipe 210 is larger than that of the outlet pipe 220, that is, the diameter of the inlet pipe 210 is larger, because as the condenser function, the specific volume of the medium flowing inside the inlet pipe 210 side is larger than that on the outlet pipe 220 side.

[0052] See Figure 4 , in one of the embodiments, the size configurations of the manifolds 200 and the connecting pipes 230 are further optimized. For example:

[0053] In one heat exchange unit, there is a first outlet pipe 220a with a diameter of D1 and a first inlet pipe 210a with a diameter of D2. In order to adapt to the change in the specific volume of the refrigerant and balance heat exchange and pressure drop, taking this heat exchange unit as an example of being used as a condenser, then D2 is greater than D1. Similarly, if it is used as an evaporator, the relationship of the pipe diameters is reversed. The pipe diameter can be understood as the inner diameter, and on the premise that the pipe walls are the same or basically the same, it can also be understood as the outer diameter.

[0054] In another heat exchange unit, there is a second inlet pipe 210b with a diameter of D3 and a second outlet pipe 220b with a diameter of D4. Taking this heat exchange unit as an example of being used as an evaporator, then D4 is greater than D3. Similarly, if it is used as a condenser, the relationship of the pipe diameters is reversed.

[0055] Figure 4The corresponding connection relationship between the header pipes and the joint pipes is as follows: The first outlet pipe 220a is connected to the first joint pipe 230a, and the pipe diameter is OD1; the first inlet pipe 210a is connected to the second joint pipe 230b, and the pipe diameter is OD2; the second inlet pipe 210b is connected to the third joint pipe 230c, and the pipe diameter is OD3; the second outlet pipe 220b is connected to the fourth joint pipe 230d, and the pipe diameter is OD4; and it satisfies: OD1 < OD2 ≤ 1.56 * OD1. The diameter of OD1 is relatively small, which is beneficial to the uniform liquid distribution of the heat exchange medium. OD1 < OD2 can adapt to the specific volume change of the heat exchange medium and balance heat exchange and pressure drop. OD2 should not be too large, otherwise it is not conducive to the outflow of the heat exchange medium. Similarly, OD3 < OD4 ≤ 1.56 * OD3.

[0056] When used as an evaporator, the pipe diameters of the second inlet pipe 210b and the third joint pipe 230c should not be too large to ensure the uniformity of liquid distribution.

[0057] See Figure 5 , in which one heat exchange unit has the first heat exchange flat tube 100a with a thickness of M1, and the other heat exchange unit has the second heat exchange flat tube 100b with a thickness of M2. The heat exchange amounts of each heat exchange unit may have different design requirements, and the thickness of the heat exchange flat tube can be adjusted accordingly, that is, M1 and M2 can be equal or unequal. Similarly, the distance between two adjacent first heat exchange flat tubes 100a in one heat exchange unit is N1, and the distance between two adjacent second heat exchange flat tubes 100b in the other heat exchange unit is N2. N1 and N2 can be equal or unequal.

[0058] Regarding the header pipe 200, it can adopt an integral or split docking method. In the split docking method, two adjacent unit pipes 240 are directly inserted and matched. In a preferred embodiment, such as Figure 6 , Figure 7 , an intermediate pipe 250 is provided between two adjacent unit pipes 240 and they are interconnected through the intermediate pipe 250.

[0059] Among the two adjacent unit pipes 240 and the intermediate pipe 250, one of them has a reduced diameter portion and is inserted and matched with the other through the reduced diameter portion. For example, one end of the unit pipe 240 has a first reduced diameter portion 242 and is inserted into the adjacent intermediate pipe 250 on this side through the first reduced diameter portion 242. Similarly, one end of the intermediate pipe 250 has a second reduced diameter portion 251 and is inserted into the adjacent unit pipe 240 on this side through the second reduced diameter portion 251. The locking part can adopt a smooth transition or a stepped transition.

[0060] In this embodiment, the intermediate pipe 250 is used as a transition, which can not only flexibly adjust and adapt to the thickness and spacing changes of the heat exchange flat tubes, but also avoid the accumulation of processing and assembly errors, reduce the deformation and internal stress during the later welding process, and further ensure the sealing performance.

[0061] In one embodiment, the axial length between the unit tube 240 and the intermediate tube 250 is further optimized. For example, along the length direction of the header 200, the length of the unit tube 240 is L1; the length of the intermediate tube 250 is L2, and L1:L2 = 1:(0.5 - 2), for example, L1:L2 = 1:1.

[0062] In some other embodiments of the present application, a heat exchange system is further provided, including the heat exchangers in the above embodiments. Two heat exchange units in the heat exchanger are respectively connected to corresponding heat exchange media, and each heat exchange unit independently uses refrigerant or water as the heat exchange media. Among the two heat exchange units, one is connected to the first heat exchange system, and the other is connected to the second heat exchange system. Each heat exchange system may be provided with a compressor or not.

[0063] See Figure 8 , in one embodiment, a heat exchanger A, a heat exchanger B, and supporting equipment such as a compressor, a throttle valve, and a ball valve are configured. Overall, two heat exchange systems are formed. The first heat exchange system is provided with a compressor and uses refrigerant as the heat exchange media, and the second heat exchange system is not provided with a compressor and uses water as the heat exchange media. This method can be applied to fields such as industrial laser chillers.

[0064] For the heat exchanger A, one heat exchange unit passes through the high-temperature medium of the first heat exchange system (functioning as a condenser), and the other heat exchange unit passes through the low-temperature medium of the second heat exchange system (functioning as an evaporator). The two heat exchange media exchange heat with the air flowing through the fins.

[0065] For the heat exchanger B, one heat exchange unit passes through the low-temperature medium of the first heat exchange system (functioning as an evaporator), and the other heat exchange unit passes through the high-temperature medium of the second heat exchange system (functioning as a condenser). The two heat exchange media exchange heat with the air flowing through the fins.

[0066] See Figure 9 , in another embodiment, the main difference from the Figure 8 embodiment is that in the second heat exchange system, low-temperature inlet water and low-temperature outlet water are additionally provided for the heat exchanger B, further strengthening the heat exchange effect.

[0067] The heat exchanger of the present application is further optimized in design, improving the regularity of the structure and the assembly efficiency, and flexibly adapting to different requirements.

[0068] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as falling within the scope described in this specification. When the technical features in different embodiments are embodied in the same drawing, the drawing can be regarded as also disclosing the combination examples of the various embodiments involved.

[0069] The above-described embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the patent protection scope of the present application shall be subject to the appended claims.

Claims

1. A heat exchanger, characterized in that, It includes two heat exchange units. Each of the heat exchange units includes a plurality of heat exchange flat tubes (100) arranged at intervals, and a header pipe (200) communicated with the plurality of heat exchange flat tubes (100). The heat exchange flat tubes (100) in the two heat exchange units are arranged alternately. The heat exchange flat tube (100) has a flow channel that turns back along its own length direction, and the inlet and outlet of the flow channel are located at the same end. There are two header pipes (200) in the same heat exchange unit. The two header pipes (200) are correspondingly communicated with the inlet and the outlet, and the header pipes (200) of the two heat exchange units are located on two opposite sides of the heat exchanger.

2. The heat exchanger according to claim 1, characterized in that, The header pipe (200) includes a plurality of unit pipes (240) communicated in sequence. Each of the heat exchange flat tubes (100) in the same heat exchange unit is communicated with the corresponding unit pipe (240).

3. The heat exchanger according to claim 1, wherein, The maximum distance along the width direction of the heat exchange flat tube (100) between the two header pipes (200) in the same heat exchange unit is l, and the width of the heat exchange flat tube (100) is L. L and l satisfy: L > l.

4. The heat exchanger according to claim 3, wherein, The centerlines of two of the said header pipes (200) in the same heat exchange unit are arranged staggeredly in the length direction of the heat exchange flat tube (100), and the relationship between L and l satisfies:

5. The heat exchanger according to claim 1, characterized in that Each of the header pipes (200) is provided with a connection pipe (230). All the connection pipes (230) in the heat exchanger are located on the same side of the heat exchanger; the corresponding connection pipes (230) in the two heat exchange units are bent towards each other.

6. The heat exchanger according to claim 5, characterized in that, Among the two connection pipes (230) in the same heat exchange unit, the diameter of one connection pipe (230) is OD1, and the diameter of the other connection pipe (230) is OD2; and it satisfies: OD1 < OD2 ≤ 1.56 * OD1.

7. The heat exchanger according to any one of claims 1-6, characterized in that, The adjacent heat exchange flat tubes (100) are thermally coupled through fins (300). Along the width direction of the heat exchange flat tube (100), one side of the heat exchanger is the windward side in the upstream of the air flow; the two heat exchange units are each independently used as an evaporator or a condenser, and the inlet side is on the windward side.

8. The heat exchanger according to claim 2, characterized in that, Among the plurality of unit pipes (240), the adjacent two unit pipes (240) are directly inserted and matched, or an intermediate pipe (250) is provided between the adjacent two unit pipes (240) and they are communicated with each other through the intermediate pipe (250).

9. The heat exchanger according to claim 8, wherein, Along the length direction of the header pipe (200), the length of the unit pipe (240) is L1; the length of the intermediate pipe (250) is L2, and it satisfies L1:L2 = 1:(0.5 - 2).

10. A heat exchange system, characterized in that, It includes the heat exchanger according to any one of claims 1 to 9, wherein the two heat exchange units are respectively connected to the corresponding heat exchange media; each of the heat exchange units independently uses a refrigerant or water as the heat exchange media.

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