Heat exchanger and heat exchange system

Abstract

The utility model relates to a heat exchanger and a heat exchange system, the heat exchanger comprises a first heat exchange unit and a second heat exchange unit, the first heat exchange unit comprises a plurality of first flat pipes, and the second heat exchange unit comprises a plurality of second flat pipes. Each first flat pipe is provided with a first flow channel folded back in the length direction of the first flat pipe, and an inlet and an outlet of the first flow channel are located at the same end of the first flat pipe; each second flat pipe is provided with a second flow channel folded back in the length direction of the second flat pipe, an inlet and an outlet of each second flow channel are located at the same end of the corresponding second flat pipe, and the first flat pipes and the second flat pipes are arranged in a staggered mode in the thickness direction of the first flat pipes; and each first flat pipe and the corresponding second flat pipe are attached in the thickness direction of the first flat pipe and the corresponding second flat pipe to form a heat exchange part. According to the heat exchanger and the heat exchange system, heat exchange between the first heat exchange unit and the second heat exchange unit can be enhanced.

Description

Technical Field

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

[0002] A two - flow - path heat exchanger includes two relatively arranged heat exchange units. Each heat exchange unit includes a plurality of flat tubes, and the flat tubes of the two heat exchange units are arranged in an alternating and spaced manner. When the media temperatures in the two heat exchange units are different and heat exchange is required between the two heat exchange units, since there is a gap between the flat tubes of the two heat exchange units and the flat tubes are arranged in a single - pass configuration, it is not conducive to heat exchange between the two heat exchange units. Summary of the Utility Model

[0003] Based on this, it is necessary to provide a heat exchanger and a heat exchange system that enhance heat exchange between two heat exchange units to improve the heat exchange efficiency.

[0004] A heat exchanger includes a first heat exchange unit and a second heat exchange unit. The first heat exchange unit includes a plurality of first flat tubes, and the second heat exchange unit includes a plurality of second flat tubes. Each first flat tube has a first flow channel that turns back along its own length direction, and the inlet and outlet of the first flow channel are located at the same end of the first flat tube; each second flat tube has a second flow channel that turns back along its own length direction, and the inlet and outlet of the second flow channel are located at the same end of the second flat tube. Among them, the first flat tubes and the second flat tubes are arranged alternately along their own thickness directions, and each first flat tube is in contact with a corresponding second flat tube along its own thickness direction to form a heat exchange part.

[0005] In one embodiment, a plurality of heat exchange parts are arranged at intervals along the thickness direction of the first flat tube. The thickness of the first flat tube is h1, the thickness of the second flat tube is h2, and the distance between adjacent two heat exchange parts is h3, and 2.6(h1 + h2) ≤ h3 ≤ 5.5(h1 + h2).

[0006] In one embodiment, the cross - sectional area of the first flow channel in the thickness direction is different from the cross - sectional area of the second flow channel in the thickness direction.

[0007] In one embodiment, the first flow channel includes N parallel first micro - channels, the second flow channel includes M parallel second micro - channels, the cross - sectional area of the first micro - channel is equal to the cross - sectional area of the second micro - channel, and N is not equal to M; or, the first flow channel includes N parallel first micro - channels, the second flow channel includes M parallel second micro - channels, the cross - sectional area of the first micro - channel is not equal to the cross - sectional area of the second micro - channel, and N is equal to M; where 6 ≤ N ≤ 18 and 6 ≤ M ≤ 18.

[0008] In one embodiment, the width of the first flat tube is different from the width of the second flat tube, and / or the thickness of the first flat tube is different from the thickness of the second flat tube, wherein the width of the first flat tube and the width of the second flat tube both satisfy being greater than or equal to 26 mm and less than or equal to 55 mm; the thickness of the first flat tube and the thickness of the second flat tube both satisfy being greater than or equal to 1.2 mm and less than or equal to 2.8 mm.

[0009] In one embodiment, the heat exchanger further includes a first inlet header, a first outlet header, a second inlet header, and a second outlet header. In each heat exchange part, the inlet of the first flow channel communicates with the first inlet header, the outlet of the first flow channel communicates with the first outlet header, the inlet of the second flow channel communicates with the second inlet header, and the outlet of the second flow channel communicates with the second outlet header; and, along the length direction of the heat exchange part, the first inlet header and the first outlet header are located at the same end of the heat exchange part, and the first inlet header and the first outlet header are arranged offset along the width direction of the heat exchange part; and / or, the second inlet header and the second outlet header are located at the opposite ends of the heat exchange part, and the second inlet header and the second outlet header are arranged offset along the width direction of the heat exchange part.

[0010] In one embodiment, the first inlet header, the first outlet header, the second inlet header, and the second outlet header are each configured to include a plurality of unit joint pipes, and the plurality of unit joint pipes are stacked and connected in sequence. Each unit joint pipe includes a first section and a second section, and the diameter of the first section is smaller than the diameter of the second section, so that the first section of the unit joint pipe can be inserted into the second section of the adjacent unit joint pipe; the unit joint pipes of the first inlet header, the unit joint pipes of the first outlet header, the unit joint pipes of the second inlet header, and the unit joint pipes of the second outlet header are arranged side by side in one-to-one correspondence, and, the four unit joint pipes connected to the same heat exchange part are located at the same height along the thickness direction of the heat exchange part.

[0011] In one embodiment, the first flat tube and the second flat tube respectively include a main body part, an inlet connection part and an outlet connection part located at the same end of the main body part along the length direction; in each heat exchange part, the main body parts of the first flat tube and the second flat tube are stacked and welded, the inlet connection part of the first flat tube is inserted into a unit joint pipe of the first inlet header, the outlet connection part of the first flat tube is inserted into a corresponding unit joint pipe of the first outlet header, the inlet connection part of the second flat tube is inserted into a corresponding unit joint pipe of the second inlet header, and the outlet connection part of the second flat tube is inserted into a corresponding unit joint pipe of the second outlet header; wherein, the pipe diameter of the first inlet header is different from the pipe diameter of the first inlet header, and the pipe diameter of the second inlet header is different from the pipe diameter of the second inlet header.

[0012] In one embodiment, heat exchange fins are provided between two adjacent heat exchange parts.

[0013] The present application also provides a heat exchange system, which includes the heat exchanger described in any one of the above embodiments.

[0014] Compared with the prior art, for the heat exchanger and the heat exchange system provided by the present application, by arranging the first flat tube and the second flat tube in the each heat exchange part to be in contact for heat exchange, it is beneficial to improve the heat exchange efficiency between the medium flowing through the first flat tube and the medium flowing through the second flat tube. Moreover, by arranging the first flow channel to turn back along the length direction of the first flat tube, and its inlet and outlet are located at the same end, the flow path of the medium in the first flat tube can be extended. Similarly, by arranging the second flow channel to turn back along the length direction of the second flat tube, and its inlet and outlet are located at the same end, the flow path of the medium in the second flat tube can be extended, thereby being beneficial to further improving the heat exchange efficiency between the medium flowing through the first flat tube and the medium flowing through the second flat tube. Among them, the medium flowing through the first flat tube and the medium flowing through the second flat tube can be the same medium or different media. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order 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, other drawings can be obtained based on these drawings without creative efforts.

[0016] Figure 1 Isometric view of the heat exchanger provided by the present application;

[0017] Figure 2 Front view of the heat exchanger provided by the present application;

[0018] Figure 3 Assembly schematic diagram of the first flat tube, the first inlet manifold and the first outlet manifold provided by the present application;

[0019] Figure 4 Assembly schematic diagram of the second flat tube, the second inlet manifold and the second outlet manifold provided by the present application;

[0020] Figure 5 Partial cross-sectional view of the heat exchanger provided by the present application along the axis of the first inlet manifold;

[0021] Figure 6 Schematic diagram of a heat exchange system according to an embodiment provided by the present application;

[0022] Figure 7 Schematic diagram of another heat exchange system according to an embodiment provided by the present application.

[0023] Reference Numerals: 1, heat exchange system; 100, heat exchanger; 101, first heat exchange unit; 102, second heat exchange unit; 10, heat exchange part; 11, first flat tube; 111, first flow channel; 112, main body part; 113, inlet connection part; 114, outlet connection part; 12, second flat tube; 121, second flow channel; 20, heat exchange fins; 30, first inlet header; 40, first outlet header; 50, second inlet header; 60, second outlet header; 70, unit joint pipe; 71, first section; 72, second section; 200, compressor; 300, throttling element; 400, ball valve. Detailed Embodiment

[0024] To make the above objects, features, and advantages of the present application more apparent and understandable, the following detailed description of the specific embodiments of the present application will be provided in conjunction with 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.

[0025] It should be noted that when a component is referred to as being "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 for illustrative purposes only and do not represent the only implementation manner.

[0026] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood 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 such feature. 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.

[0027] In the present application, unless otherwise clearly defined and limited, the first feature may be in direct contact with the second feature "above" or "below" 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 has a higher horizontal height than the second feature. The first feature being "below", "beneath", and "under" 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 has a lower horizontal height than the second feature.

[0028] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as commonly understood by those skilled in the technical field to which this application pertains. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more of the related listed items.

[0029] Please refer to Figures 1 to 4 This application provides a heat exchanger 100. A heat exchanger 100 includes a first heat exchange unit 101 and a second heat exchange unit 102. The first heat exchange unit 101 includes a plurality of first flat tubes 11, and the second heat exchange unit 102 includes a plurality of second flat tubes 12. Each first flat tube 11 has a first flow channel 111 that turns back along its own length direction, and the inlet and outlet of the first flow channel 111 are located at the same end of the first flat tube 11; each second flat tube 12 has a second flow channel 121 that turns back along its own length direction, and the inlet and outlet of the second flow channel 121 are located at the same end of the second flat tube 12. Wherein, the first flat tubes 11 and the second flat tubes 12 are arranged in an interleaved manner along their own thickness directions, and each first flat tube 11 is in contact with and forms a heat exchange part 10 with a corresponding second flat tube 12 along their own thickness directions.

[0030] By arranging the first flat tube 11 and the second flat tube 12 in each heat exchange part 10 to be in contact for heat exchange, it is beneficial to improve the heat exchange efficiency between the medium flowing through the first flat tube 11 and the medium flowing through the second flat tube 12. And, by arranging the first flow channel 111 to turn back along the length direction of the first flat tube 11 and its inlet and outlet to be located at the same end, the flow path of the medium in the first flat tube 11 can be extended. Similarly, by arranging the second flow channel 121 to turn back along the length direction of the second flat tube 12 and its inlet and outlet to be located at the same end, the flow path of the medium in the second flat tube 12 can be extended, thereby being beneficial to further improving the heat exchange efficiency between the medium flowing through the first flat tube 11 and the medium flowing through the second flat tube 12. At the same time, without bending the heat exchange components, a double-row heat exchanger can be formed. In the case of the same heat transfer capacity, the length of the heat exchanger will not increase, the installation space is not limited, and the manufacturing cost is also reduced. Wherein, the medium flowing through the first flat tube 11 and the medium flowing through the second flat tube 12 can be the same medium or different media.

[0031] Exemplarily, the first flow channel 111 extends in a U shape in the first flat tube 11, and the second flow channel 121 extends in a U shape in the second flat tube 12.

[0032] Among them, the cross-sectional area of the first flow channel 111 in the thickness direction is different from that of the second flow channel 121 in the thickness direction. In other words, the flow area of the first flow channel 111 is different from that of the second flow channel 121.

[0033] In this way, the heat exchanger 100 can meet the usage scenarios where the heat dissipation requirements of the first heat exchange unit 101 and the second heat exchange unit 102 are different. For example, when the first heat exchange unit 101 is used as a condenser and the second heat exchange unit 102 is used as an evaporator, since the condenser requires a greater heat exchange effect, by setting the cross-sectional area of the first flow channel 111 in the thickness direction to be larger than that of the second flow channel 121 in the thickness direction, it is beneficial to heat recovery. Similarly, when the first heat exchange unit 101 is used as an evaporator and the second heat exchange unit 102 is used as a condenser, the cross-sectional area of the first flow channel 111 in the thickness direction can be set to be smaller than that of the second flow channel 121 in the thickness direction. Of course, in other embodiments, when the heat dissipation requirements of the first heat exchange unit 101 and the second heat exchange unit 102 are the same, the flow areas of the first flow channel 111 and the second flow channel 121 can be set to be the same.

[0034] In one embodiment, the flow areas of the first flow channel 111 and the second flow channel 121 can be made different by setting the cross-sectional dimensions of the first flat tube 11 and the second flat tube 12. For example, only the width of the first flat tube 11 can be made different from that of the second flat tube 12; or only the thickness of the first flat tube 11 can be made different from that of the second flat tube 12. Or, the width of the first flat tube 11 can be made different from that of the second flat tube 12, and the thickness of the first flat tube 11 can also be made different from that of the second flat tube 12. Among them, the widths of the first flat tube 11 and the second flat tube 12 both satisfy being greater than or equal to 26 mm and less than or equal to 55 mm; the thicknesses of the first flat tube 11 and the second flat tube 12 both satisfy being greater than or equal to 1.2 mm and less than or equal to 2.8 mm. It can be understood that if the widths of the first flat tube 11 and the second flat tube 12 are too large, the processing and welding difficulties will increase. If the widths of the first flat tube 11 and the second flat tube 12 are too small, the first flow channel 111 and the second flow channel 121 will be too narrow, thereby increasing the flow resistance. If the thicknesses of the first flat tube 11 and the second flat tube 12 are too thick, the heat transfer effect between the first flat tube 11 and the second flat tube 12 will become worse. If the thicknesses of the first flat tube 11 and the second flat tube 12 are too thin, the pressure-bearing capacity of the first flat tube 11 and the second flat tube 12 will be insufficient.

[0035] Alternatively, in another embodiment, the first flow channel 111 may include N first micro-channels connected in parallel, and the second flow channel 121 may include M second micro-channels connected in parallel. The cross-sectional area of the first micro-channel is equal to that of the second micro-channel, and N is not equal to M; wherein, 6 ≤ N ≤ 18, 6 ≤ M ≤ 18. In this way, the flow areas of the first flow channel 111 and the second flow channel 121 can also be made different.

[0036] In yet another embodiment, the first flow channel 111 may include N first micro-channels connected in parallel, and the second flow channel 121 may include M second micro-channels connected in parallel. The cross-sectional area of the first micro-channel is not equal to that of the second micro-channel, and N is equal to M; wherein, 6 ≤ N ≤ 18, 6 ≤ M ≤ 18. In this way, the flow areas of the first flow channel 111 and the second flow channel 121 can also be made different.

[0037] Optionally, the plurality of first micro-channels are arranged along the width direction of the first flat tube 11, and the wider the width of the first flat tube 11, the more the number of the first micro-channels can be set. The plurality of second micro-channels are arranged along the width direction of the second flat tube 12, and the wider the width of the second flat tube 12, the more the number of the second micro-channels can be set.

[0038] The first flat tube 11 and the second flat tube 12 respectively include a main body portion 112, an inlet connection portion 113 and an outlet connection portion 114 located at the same end of the main body portion 112 in the length direction. Among them, in each heat exchange portion 10, the main body portion 112 of the first flat tube 11 is stacked and welded with the main body portion 112 of the second flat tube 12. The inlet connection portion 113 is used to form the inlet of the first flow channel 111 or the inlet of the second flow channel 121, and the outlet connection portion 114 is used to form the outlet of the first flow channel 111 or the outlet of the second flow channel 121.

[0039] Among them, the inlet connection portion 113 and the outlet connection portion 114 are respectively configured in a flat plate shape, and along the direction from close to the main body portion 112 to far from the main body portion 112, the cross-sectional areas of the inlet connection portion 113 and the outlet connection portion 114 both show a decreasing trend. The cross-sectional area of the inlet connection portion 113 is set to show a decreasing trend, which reduces the pressure drop of the medium in the channel and is conducive to the liquid separation of the medium. The cross-sectional area of the outlet connection portion 114 is set to show a decreasing trend, which is conducive to increasing the flow velocity of the medium and improving the heat exchange efficiency.

[0040] Optionally, in one embodiment, the first flat tube 11 and the second flat tube 12 are configured to include a first plate body and a second plate body that are buckled together. Among them, the first plate body includes a first body and a first protrusion, the first protrusion protrudes from the first body, and the second body is disposed on the first body to form a first flow channel 111 or a second flow channel 121. The second plate body includes a second body and a second protrusion, the second protrusion protrudes from the second body, and the second body is disposed on the first body to form a first flow channel 111 or a second flow channel 121.

[0041] Furthermore, a plurality of heat exchange parts 10 are arranged at intervals along the thickness direction of the first flat tube 11, and heat exchange fins 20 are provided between two adjacent heat exchange parts 10. The heat exchange fins 20 are used to increase the heat exchange area.

[0042] Specifically, along the length direction of the heat exchange part 10, the heat exchange fins 20 extend in a wavy shape, and the opposite sides of the heat exchange fins 20 are respectively welded to two adjacent heat exchange parts 10. Among them, the assembly process of the heat exchanger 100 is as follows: first, in each heat exchange part 10, the first flat tube 11 and the second flat tube 12 are fitted together, and the heat exchange fins 20 are placed between two adjacent heat exchange parts 10, and then the heat exchange parts 10 and the heat exchange fins 20 are synchronously furnace-welded.

[0043] The heat exchanger 100 further includes a first inlet header 30, a first outlet header 40, a second inlet header 50, and a second outlet header 60. The first inlet header 30, the first outlet header 40, the second inlet header 50, and the second outlet header 60 all extend along the thickness direction of the heat exchange part 10. And in each heat exchange part 10, the inlet of the first flow channel 111 communicates with the first inlet header 30, the outlet of the first flow channel 111 communicates with the first outlet header 40, the inlet of the second flow channel 121 communicates with the second inlet header 50, and the outlet of the second flow channel 121 communicates with the second outlet header 60; and along the length direction of the heat exchange part 10, the first inlet header 30 and the first outlet header 40 are located at the same end, and the first inlet header 30 and the first outlet header 40 are arranged in a staggered manner along the width direction of the heat exchange part 10. In this way, it is beneficial to the assembly of the first inlet header 30 and the first outlet header 40, and at the same time, the space occupied in the width direction of the heat exchange part 10 can be reduced, making the overall structure of the heat exchanger more compact. The second inlet header 50 and the second outlet header 60 are located at the opposite end, and the second inlet header 50 and the second outlet header 60 are arranged in a staggered manner along the width direction of the heat exchange part 10. In this way, it is beneficial to the assembly of the second inlet header 50 and the second outlet header 60, and at the same time, the space occupied in the width direction of the heat exchange part 10 can be reduced, making the overall structure of the heat exchanger more compact.

[0044] Among them, a plurality of first flat tubes 11 are connected to a first inlet header 30 and a first outlet header 40 to form a first heat exchange unit 101, and a plurality of second flat tubes 12 are connected to a second inlet header 50 and a second outlet header 60 to form a second heat exchange unit 102.

[0045] Optionally, along the width direction of the heat exchange part 10, the first inlet header 30 and the second inlet header 50 are located at the same end, and the first outlet header 40 and the second outlet header 60 are located at the opposite end. In this way, the refrigerant in the first flow channel 111 can perform countercurrent heat exchange with the refrigerant in the second flow channel 121. The temperature difference of countercurrent heat exchange is larger than that of concurrent heat exchange, which is beneficial to further improving the heat exchange effect.

[0046] Of course, in another embodiment, it may also be that along the width direction of the heat exchange part 10, the first inlet header 30 and the second outlet header 60 are located at the same end, and the first outlet header 40 and the second inlet header 50 are located at the opposite end.

[0047] The diameters of the first inlet header 30 and the first outlet header 40 are set to be different. The diameters of the second outlet header 60 and the second inlet header 50 are different.

[0048] In one embodiment, the first inlet header 30, the first outlet header 40, the second inlet header 50, and the second outlet header 60 are respectively configured to include a plurality of unit joint tubes 70. Please refer to Figure 5 , and take the first inlet header 30 as an example to introduce the specific structure of the unit joint tube 70. A plurality of unit joint tubes 70 are stacked and connected in sequence. Each unit joint tube 70 includes a first section 71 and a second section 72. The diameter of the first section 71 is smaller than that of the second section 72, so that the first section of the unit joint tube 70 can be inserted into the second section 72 of the adjacent unit joint tube 70.

[0049] The unit joint tubes 70 of the first inlet header 30, the unit joint tubes 70 of the first outlet header 40, the unit joint tubes 70 of the second inlet header 50, and the unit joint tubes 70 of the second outlet header 60 are arranged in one-to-one correspondence in the thickness direction of the heat exchange part 10. Moreover, the four unit joint tubes 70 connected to the same heat exchange part 10 are located at the same height in the thickness direction of the heat exchange part 10. In this way, it is convenient to connect each heat exchange part 10 to the corresponding unit joint tube 70, and the distance requirement between two adjacent heat exchange parts 10 can be met by installing the heat exchange part 10 on the unit joint tubes 70 at different heights.

[0050] Specifically, in each heat exchange part 10, the inlet connection part 113 of the first flat tube 11 is inserted into a unit joint tube 70 of the first inlet header 30, and the outlet connection part 114 of the first flat tube 11 is inserted into a corresponding unit joint tube 70 of the first outlet header 40. The inlet connection part 113 of the second flat tube 12 is inserted into a corresponding unit joint tube 70 of the second inlet header 50, and the outlet connection part 114 of the second flat tube 12 is inserted into a corresponding unit joint tube 70 of the second outlet header 60.

[0051] Of course, in other embodiments, the first inlet header 30, the first outlet header 40, the second inlet header 50, and the second outlet header 60 may also be configured with integral pipelines.

[0052] Please refer to Figure 1 , the thickness of the first flat tube 11 is h1, the thickness of the second flat tube 12 is h2, and the distance between two adjacent heat exchange parts 10 is h3, and 2.6(h1 + h2) ≤ h3 ≤ 5.5(h1 + h2). It can be understood that if h3 is too small, that is, the distance between two adjacent heat exchange parts 10 is too small, correspondingly, each unit joint tube 70 needs to be made too short to be processed. If h3 is too large, that is, the distance between two adjacent heat exchange parts 10 is too large, correspondingly, the height of the heat exchange fins 20 also needs to be made higher. Since the heat exchange part 10 and the heat exchange fins 20 are welded in the furnace synchronously, too high a height of the heat exchange fins 20 will also cause difficulties in processing the heat exchanger 100.

[0053] For example, the value of h3 can be 2.6(h1 + h2), 2.65(h1 + h2), 2.7(h1 + h2), 3(h1 + h2), 4(h1 + h2), 5(h1 + h2), 5.5(h1 + h2), etc. It can be specifically selected according to the actual situation as long as it is within the above range.

[0054] This application also provides a heat exchange system 1, which includes the heat exchanger 100 described in any one of the above embodiments.

[0055] Exemplarily, in one embodiment, as Figure 6As shown, the heat exchange system 1 includes a compressor 200, a throttling element 300, and two heat exchangers 100. One of the heat exchangers 100 is connected in series between the outlet of the compressor 200 and the throttling element 300, and the other heat exchanger 100 is connected in series between the throttling element 300 and the inlet of the compressor 200. Moreover, in each heat exchanger 100, the first heat exchange unit 101 is connected in parallel with the second heat exchange unit 102. In this embodiment, the same medium flows through the first heat exchange unit 101 and the second heat exchange unit 102 of each heat exchanger 100. When only the first heat exchange unit 101 or the second heat exchange unit 102 of both heat exchangers 100 is opened, the heat exchange system 1 operates at half load. When the first heat exchange unit 101 and the second heat exchange unit 102 of both heat exchangers 100 are fully opened, the heat exchange system 1 operates at full load.

[0056] Exemplarily, in another embodiment, as Figure 7 shown, when the heat exchange system 1 is used in an industrial cooling system, the medium of the first heat exchange unit 101 is a refrigerant, and the medium of the second heat exchange unit 102 is water. Specifically, the heat exchange system 1 includes a compressor 200, a throttling element 300, and two heat exchangers 100. Among them, the outlet of the compressor 200, the first heat exchange unit 101 of one heat exchanger 100, the throttling element 300, the first heat exchange unit 101 of the other heat exchanger 100, and the inlet of the compressor 200 are connected in series in sequence to form a refrigerant circuit. The second heat exchange unit 102 of one heat exchanger 100, a ball valve 400, and the second heat exchange unit 102 of the other heat exchanger 100 are connected and used for the circulation of water supply.

[0057] 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 embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0058] The above-described embodiments only represent several implementation manners of the present application. Their descriptions are relatively specific and detailed, but they should not be construed as limiting 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 should be subject to the appended claims.

Claims

1. A heat exchanger, comprising a first heat exchange unit (101) and a second heat exchange unit (102). The first heat exchange unit (101) includes a plurality of first flat tubes (11), and the second heat exchange unit (102) includes a plurality of second flat tubes (12), characterized in that each of the first flat tubes (11) has a first flow channel (111) that turns back along its own length direction, and the inlet and outlet of the first flow channel (111) are located at the same end of the first flat tube (11); each of the second flat tubes (12) has a second flow channel (121) that turns back along its own length direction, and the inlet and outlet of the second flow channel are located at the same end of the second flat tube (12). Wherein, the first flat tubes (11) and the second flat tubes (12) are arranged alternately along their own thickness directions, and each of the first flat tubes (11) is attached to a corresponding second flat tube (12) along its own thickness direction to form a heat exchange part (10).

2. The heat exchanger according to claim 1, characterized in that, A plurality of the heat exchange parts (10) are arranged at intervals along the thickness direction of the first flat tubes (11). The thickness of the first flat tubes (11) is h1, the thickness of the second flat tubes (12) is h2, and the distance between two adjacent heat exchange parts (10) is h3. And, 2.6(h1 + h2) ≤ h3 ≤ 5.5(h1 + h2).

3. The heat exchanger according to claim 1, characterized in that, The cross-sectional area of the first flow channel (111) in the thickness direction is different from the cross-sectional area of the second flow channel (121) in the thickness direction.

4. The heat exchanger according to claim 3, wherein The first flow channel (111) includes N first micro-channels in parallel, the second flow channel (121) includes M second micro-channels in parallel, the cross-sectional areas of the first micro-channels and the second micro-channels are equal, and N is not equal to M; Or, the first flow channel (111) includes N first micro-channels in parallel, the second flow channel (121) includes M second micro-channels in parallel, the cross-sectional areas of the first micro-channels and the second micro-channels are not equal, and N is equal to M; Wherein, 6 ≤ N ≤ 18, 6 ≤ M ≤ 18.

5. The heat exchanger according to claim 3, wherein, The width of the first flat tubes (11) is different from the width of the second flat tubes (12), and / or, the thickness of the first flat tubes (11) is different from the thickness of the second flat tubes (12); Wherein, the widths of the first flat tubes (11) and the second flat tubes (12) both satisfy being greater than or equal to 26 mm and less than or equal to 55 mm; the thicknesses of the first flat tubes (11) and the second flat tubes (12) both satisfy being greater than or equal to 1.2 mm and less than or equal to 2.8 mm.

6. The heat exchanger according to any one of claims 1-5, characterized in that, The heat exchanger further includes a first inlet header (30), a first outlet header (40), a second inlet header (50), and a second outlet header (60). In each heat exchange part (10), the inlet of the first flow channel (111) is communicated with the first inlet header (30), the outlet of the first flow channel (111) is communicated with the first outlet header (40), the inlet of the second flow channel (121) is communicated with the second inlet header (50), and the outlet of the second flow channel (121) is communicated with the second outlet header (60); Moreover, along the length direction of the heat exchange part (10), the first inlet header (30) and the first outlet header (40) are located at the same end of the heat exchange part (10), and the first inlet header (30) and the first outlet header (40) are arranged in a staggered manner along the width direction of the heat exchange part (10); and / or, the second inlet header (50) and the second outlet header (60) are located at the opposite end of the heat exchange part (10), and the second inlet header (50) and the second outlet header (60) are arranged in a staggered manner along the width direction of the heat exchange part (10).

7. The heat exchanger according to claim 6, wherein The first inlet header (30), the first outlet header (40), the second inlet header (50), and the second outlet header (60) are each configured to include a plurality of unit pipes (70). The plurality of unit pipes (70) are sequentially stacked and communicated. Each unit pipe (70) includes a first section (71) and a second section (72). The diameter of the first section (71) is smaller than the diameter of the second section (72), so that the first section of the unit pipe (70) can be inserted into the second section (72) of the adjacent unit pipe (70); The unit pipes (70) of the first inlet header (30), the unit pipes (70) of the first outlet header (40), the unit pipes (70) of the second inlet header (50), and the unit pipes (70) of the second outlet header (60) are arranged in one-to-one correspondence. Moreover, the four unit pipes (70) connected to the same heat exchange part (10) are located at the same height along the thickness direction of the heat exchange part (10).

8. The heat exchanger according to claim 7, wherein The first flat pipe (11) and the second flat pipe (12) each include a main body part (112), an inlet connection part (113), and an outlet connection part (114) which are located at the same end of the main body part (112) along the length direction; In each of the heat exchange parts (10), the main body part (112) of the first flat tube (11) is stacked and welded with the main body part (112) of the second flat tube (12). The inlet connection part (113) of the first flat tube (11) is inserted into one unit joint tube (70) of the first inlet header (30), the outlet connection part (114) of the first flat tube (11) is inserted into one corresponding unit joint tube (70) of the first outlet header (40), the inlet connection part (113) of the second flat tube (12) is inserted into one corresponding unit joint tube (70) of the second inlet header (50), and the outlet connection part (114) of the second flat tube (12) is inserted into one corresponding unit joint tube (70) of the second outlet header (60). Wherein, the pipe diameter of the first inlet header (30) is different from that of the first inlet header (30), and the pipe diameter of the second inlet header (50) is different from that of the second inlet header (50).

9. The heat exchanger according to claim 1, wherein, Heat exchange fins (20) are arranged between two adjacent heat exchange parts (10).

10. A heat exchange system, characterized in that, The heat exchange system includes a heat exchanger (100) as described in any one of claims 1 - 9.

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