Micro-channel heat exchanger

Abstract

The invention provides a micro-channel heat exchanger, and belongs to the technical field of heat exchange. The micro-channel heat exchanger comprises two heat exchange assemblies, an inlet pipe and an outlet pipe. Each heat exchange assembly in the two heat exchange assemblies comprises a first collecting pipe, a second collecting pipe and a plurality of flat pipes, and the first collecting pipes in the two heat exchange assemblies are located at the same ends of the flat pipes; the two heat exchange assemblies comprise the first heat exchange assembly and the second heat exchange assembly, the inlet pipe communicates with the first collecting pipe in the first heat exchange assembly, and part of the outlet pipe is located in the first collecting pipe in the first heat exchange assembly and communicates with the first collecting pipe in the second heat exchange assembly. The performance of the micro-channel heat exchanger can be improved.

Description

Technical Field

[0001] The present invention belongs to the field of heat exchange technology, and in particular relates to a microchannel heat exchanger. Background Art

[0002] Microchannel heat exchanger, as a new type of efficient and compact heat exchanger, has become a hot topic in current research and has been widely used in automotive air conditioners and large commercial central air conditioners.

[0003] In the related art, a microchannel heat exchanger generally includes two heat exchange components, an inlet pipe and an outlet pipe. Each heat exchange component includes a plurality of flat tubes and two headers. For any of the heat exchange components, the two headers are arranged in parallel with each other, and the two ends of each flat tube are respectively connected to the two headers, and each of the flat tubes is parallel to each other and arranged at intervals along the length direction of the header. The two heat exchange components are arranged side by side along the length direction perpendicular to the header to form a double-layer structure, and the four headers are arranged parallel to each other. The inlet pipe is connected to the first header in one of the heat exchange components, and the outlet pipe is connected to the first header in the other heat exchange component. The first headers in the two heat exchange components are located on the same side of the heat exchanger.

[0004] However, since the inlet pipe and the outlet pipe are respectively connected to the first collecting pipes in the two heat exchange components, there is no heat exchange between the refrigerant at the inlet and the outlet, so that the temperature of the refrigerant that becomes gas phase at the outlet is higher, resulting in a high suction temperature of the compressor, affecting the refrigeration efficiency. Summary of the invention

[0005] The embodiment of the present disclosure provides a microchannel heat exchanger, which can improve the performance of the microchannel heat exchanger. The technical solution is as follows:

[0006] The disclosed embodiment provides a microchannel heat exchanger, which comprises two heat exchange components, an inlet pipe and an outlet pipe; each of the two heat exchange components comprises a first header, a second header and a plurality of flat tubes, and for any of the heat exchange components, the first header and the second header are arranged in parallel with each other, and one end of each of the plurality of flat tubes is connected to the first header, and the other end of each of the flat tubes is connected to the second header, and the plurality of flat tubes are parallel to each other and arranged at intervals along the length direction of the first header; the two heat exchange components are arranged side by side, and the arrangement directions of the two heat exchange components, the length direction of the flat tubes and the length direction of the first header are perpendicular to each other, and the first headers of the two heat exchange components are located at the same end of the flat tubes; the two heat exchange components comprise a first heat exchange component and a second heat exchange component, the inlet pipe is connected to the first header of the first heat exchange component, and part of the outlet pipe is located in the first header of the first heat exchange component and is connected to the first header of the second heat exchange component.

[0007] In another embodiment of the present disclosure, the outlet pipe includes an insertion section and a connecting section that are interconnected; one end of the insertion section is sealed and connected to the first collecting pipe in the first heat exchange component, the middle part of the insertion section is located in the first collecting pipe in the first heat exchange component, the other end of the insertion section is sealed and connected to the first collecting pipe in the second heat exchange component, and the other end of the insertion section is communicated with the first collecting pipe in the second heat exchange component, the connecting section is located outside the two heat exchange components, and one end of the connecting section is connected to the insertion section.

[0008] In another embodiment of the present disclosure, the connecting section includes a clamping section and a main section connected to each other, and the outer wall of the clamping section at one end close to the insertion section has an annular inner flange, and the inner flange is in contact with the outer wall of the first collecting pipe in the first heat exchange assembly.

[0009] In another implementation of the present disclosure, the snap-on section includes a first expanding section, a middle section and a narrowing section; one end of the first expanding section is connected to the insertion section, the other end of the first expanding section is connected to one end of the middle section, and the inner diameter of the first expanding section gradually increases along the direction from the first expanding section to the middle section; the other end of the middle section is connected to the narrowing section, and the other end of the narrowing section is sleeved on the outside of the main section, and the inner diameter of a partial pipe section of the narrowing section gradually decreases along the direction from the middle section to the narrowing section; the inner flange is formed between the first expanding section and the insertion section.

[0010] In another implementation of the present disclosure, the connecting section also includes a second expanding section, which is located outside the main section and connected to the other end of the necking section. Along the direction from the second expanding section to the necking section, the inner diameter of the second expanding section gradually decreases.

[0011] In yet another implementation of the present disclosure, the inlet pipe and the outlet pipe are located on a side of the first heat exchange component away from the second heat exchange component along the arrangement direction of the two heat exchange components.

[0012] In yet another implementation of the present disclosure, there are a plurality of inlet pipes, and the plurality of inlet pipes are arranged at intervals along the length direction of the first collecting pipe; and the outlet pipe is located between two of the plurality of inlet pipes.

[0013] In another embodiment of the present disclosure, the microchannel heat exchanger further includes two connecting plates, one of the two connecting plates is located between the two first collecting pipes and is respectively connected to the two first collecting pipes; the other of the two connecting plates is located between the two second collecting pipes and is respectively connected to the two second collecting pipes; each of the two connecting plates has a flow hole, and the flow hole is respectively connected to the two collecting pipes connected to the connecting plate.

[0014] In another embodiment of the present disclosure, the microchannel heat exchanger also includes two isolation plate assemblies, each of the two isolation plate assemblies includes a plurality of partitions, and the two isolation plate assemblies correspond to the two first collecting tubes respectively, and the plurality of partitions in each of the isolation plate assemblies are arranged at intervals along the length direction of the first collecting tube in the corresponding first collecting tube to divide the first collecting tube into a plurality of cavities; each of the inlet pipes is connected to a cavity in the first collecting tube in the first heat exchange assembly, and the outlet pipe is connected to a cavity in the first collecting tube in the second heat exchange assembly, and the cavity connected to the outlet pipe is located between the cavities connected to two of the inlet pipes.

[0015] In yet another implementation of the present disclosure, the inner diameter of the outlet pipe is greater than the inner diameter of the inlet pipe.

[0016] The technical solution provided by the embodiments of the present disclosure has the following beneficial effects:

[0017] When the microchannel heat exchanger provided by the embodiment of the present disclosure is used in an air-conditioning system for heat exchange, since the inlet pipe in the microchannel heat exchanger is connected to the first collecting pipe in the first heat exchange component of the two heat exchange components, at least a portion of the outlet pipe is located in the first collecting pipe in the first heat exchange component of the two heat exchange components, and is connected to the first collecting pipe in the second heat exchange component of the two heat exchange components, when the outlet pipe transmits the refrigerant out, the refrigerant in the outlet pipe will exchange heat with the refrigerant liquid in the first collecting pipe connected to the inlet pipe, thereby reducing the outlet temperature of the refrigerant in the outlet pipe, thereby reducing the suction temperature of the compressor, improving the system performance, and enhancing the heat exchange efficiency of the heat exchanger.

[0018] That is to say, since the outlet pipe passes through the first header in the first heat exchange assembly, and the refrigerant in the first header in the first heat exchange assembly is a low-temperature refrigerant, the refrigerant in the outlet pipe (high-temperature refrigerant) will quickly exchange heat with the low-temperature refrigerant in the first header in the first heat exchange assembly, thereby reducing the outlet temperature of the refrigerant in the outlet pipe, which helps to reduce the suction temperature of the compressor and improve system performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 is a structural schematic diagram of a microchannel heat exchanger provided in an embodiment of the present disclosure;

[0021] Figure 2 yes Figure 1 A top view of the

[0022] Figure 3 yes Figure 2 A magnified view of the structure in the middle;

[0023] Figure 4 yes Figure 1 Side view in;

[0024] Figure 5 It is a structural diagram of the connecting plate.

[0025] The symbols in the figure mean the following:

[0026] 1. heat exchange component; 1a. first heat exchange component; 1b. second heat exchange component; 11. flat tube; 12. first header; 13. second header;

[0027] 2. Import pipe;

[0028] 3. outlet pipe; 31. insertion section; 32. connection section; 320. inner flange; 321. clamping section; 322. main section; 3211. first expansion section; 3212. middle section; 3213. contraction section; 3214. second expansion section;

[0029] 4. connecting plate; 41. arc surface; 40. flow hole;

[0030] 5. Partition. DETAILED DESCRIPTION

[0031] In order to make the objectives, technical solutions and advantages of the present disclosure more clear, the embodiments of the present disclosure will be further described in detail below with reference to the accompanying drawings.

[0032] The present disclosure provides a microchannel heat exchanger, such as Figure 1 As shown, the microchannel heat exchanger includes two heat exchange components 1, an inlet pipe 2 and an outlet pipe 3.

[0033] Each heat exchange assembly 1 includes a plurality of flat tubes 11 , a first header 12 and a second header 13 .

[0034] For any heat exchange component 1, the first header 12 and the second header 13 are arranged parallel to each other, and one end of each flat tube 11 is connected to the first header 12, and the other end of each flat tube 11 is connected to the second header 13, and the multiple flat tubes 11 are parallel to each other and arranged at intervals along the length direction of the first header 12.

[0035] The two heat exchange assemblies 1 are arranged side by side, and the arrangement direction of the two heat exchange assemblies 1, the length direction of the flat tube 11 and the length direction of the first header 12 are perpendicular to each other, and the first headers 12 in the two heat exchange assemblies 1 are located at the same end of the flat tube 11. The two heat exchange assemblies 1 include a first heat exchange assembly 1a and a second heat exchange assembly 1b.

[0036] The inlet pipe 2 is connected to the first header 12 in the first heat exchange component 1a, and part of the outlet pipe 3 is located in the first header 12 in the first heat exchange component 1a and connected to the first header 12 in the second heat exchange component 1b.

[0037] When the microchannel heat exchanger provided by the embodiment of the present disclosure is used in an air-conditioning system for heat exchange, since the inlet pipe 2 in the microchannel heat exchanger is connected to the first header 12 in the first heat exchange component 1a, part of the outlet pipe 3 is located in the first header 12 in the first heat exchange component 1a, and is connected to the first header 12 in the second heat exchange component 1b, when the outlet pipe 3 transmits the refrigerant out, the refrigerant in the outlet pipe 3 will exchange heat with the refrigerant in the first header 12 in the first heat exchange component 1a connected to the inlet pipe 2, thereby reducing the outlet temperature of the refrigerant in the outlet pipe 3, so as to reduce the suction temperature of the compressor, improve the system performance, and ultimately improve the heat exchange efficiency of the heat exchanger.

[0038] That is to say, since part of the outlet pipe 3 is located in the first header 12 in the first heat exchange component 1a, and the refrigerant in the first header 12 in the first heat exchange component 1a is a low-temperature refrigerant, the refrigerant in the outlet pipe 3 (high-temperature refrigerant) will quickly exchange heat with the low-temperature refrigerant in the first header 12 in the first heat exchange component 1a, thereby reducing the outlet temperature of the refrigerant in the outlet pipe 3, which helps to reduce the suction temperature of the compressor and improve the system performance.

[0039] Figure 2 yes Figure 1 The top view in Figure 2 As shown, optionally, the outlet pipe 3 includes an insert section 31 and a connecting section 32 that are connected to each other. One end of the insert section 31 is sealed and connected to the first header 12 in the first heat exchange component 1a, the middle of the insert section 31 is located in the first header 12 in the first heat exchange component 1a, the other end of the insert section 31 is sealed and connected to the first header 12 in the second heat exchange component 1b, and the other end of the insert section 31 is communicated with the first header 12 in the second heat exchange component 1b. The connecting section 32 is located outside the two heat exchange components 1, and one end of the connecting section 32 is connected to the insert section 31.

[0040] In the above implementation, the insertion section 31 is used to communicate with the first header 12 in the second heat exchange assembly 1b, and is also used to exchange heat with the first header 12 in the first heat exchange assembly 1a. The connecting section 32 is used to transfer the refrigerant after heat exchange.

[0041] Optionally, the connecting section 32 includes a clamping section 321 and a main section 322 connected to each other, and the outer wall of the clamping section 321 near one end of the insertion section 31 has an annular inner flange 320, and the inner flange 320 fits with the outer wall of the first collecting pipe 12 in the first heat exchange component 1a.

[0042] In the above implementation, the inner flange 320 is used to change the inner diameter of a part of the structure of the clamping section 321, so that the clamping section 321 can be clamped with the first collecting pipe 12 in the first heat exchange component 1a, ensuring that the outlet pipe 3 can be positioned and assembled with the first collecting pipe 12 in the first heat exchange component 1a after being inserted into the first collecting pipe 12 in the first heat exchange component 1a.

[0043] That is, the clamping section 321 clamps the outlet pipe 3 outside the first collecting pipe 12 in the first heat exchange assembly 1a through the inner flange 320, and the main body section 322 is used to transmit the refrigerant in the outlet pipe 3 out.

[0044] Figure 3 yes Figure 2 The enlarged view of the structure in the middle, such as Figure 3 As shown, optionally, the clamping section 321 includes a first flared section 3211, a middle section 3212 and a narrowed section 3213. One end of the first flared section 3211 is connected to the insertion section 31, and the other end of the first flared section 3211 is connected to one end of the middle section 3212. Along the direction from the first flared section 3211 to the middle section 3212, the inner diameter of the first flared section 3211 gradually increases.

[0045] The other end of the middle section 3212 is connected to the narrowing section 3213, and the other end of the narrowing section 3213 is sleeved outside the main section 322. The inner diameter of the part of the narrowing section 3213 gradually decreases along the direction from the middle section 3212 to the narrowing section 3213. The connection between the first expanding section 3211 and the middle section 3212 forms an inner flange 320.

[0046] In the above implementation, the first flared section 3211 is connected to the insertion section 31 , and an inner flange 320 is formed at the connection with the middle section 3212 .

[0047] The middle section 3212 is used to connect the first expansion section 3211 with the contraction section 3213. The contraction section 3213 is used to reduce the outer diameter of the middle section 3212 so that the clamping section 321 can be connected to the main section 322.

[0048] In this embodiment, the middle section 3212 includes a constricted pipe section and a straight pipe section connected to the first expanded section 3211. The constricted pipe section is used to reduce the opening of the first expanded section 3211 so as to be connected to the straight pipe section. The straight pipe section is used to be connected to the constricted section 3213, and the outer diameter of the straight pipe section is greater than the outer diameter of the insertion section 31, so that the clamping section 321 can be limited outside the first header 12 in the first heat exchange assembly 1a.

[0049] Optionally, the clamping section 321 further includes a second expanding section 3214, which is located outside the main section 322 and connected to the other end of the shrinking section 3213. Along the direction from the second expanding section 3214 to the shrinking section 3213, the inner diameter of the second expanding section 3214 gradually decreases.

[0050] In the above implementation, the second flared section 3214 is used to enable the snap-fit ​​section 321 to be sleeved outside the main section 322 , so as to facilitate the connection between the snap-fit ​​section 321 and the main section 322 .

[0051] In this embodiment, the insertion section 31 and the clamping section 321 in the outlet pipe 3 are an integrated structure, and the integrated structure formed by the insertion section 31 and the clamping section 321 is sleeved on the outside of the main section 322 by brazing.

[0052] The clamping section 321 is also connected to the first header 12 in the first heat exchange assembly 1a by brazing, so that the outlet pipe 3 is conveniently connected to the heat exchange assembly 1.

[0053] Figure 4 yes Figure 1 The side view of Figure 4 As shown, optionally, the inlet pipe 2 and the outlet pipe 3 are located on a side of the first heat exchange component 1a away from the second heat exchange component 1b along the arrangement direction of the two heat exchange components 1.

[0054] In the above implementation, the inlet pipe 2 and the outlet pipe 3 are both located on the side of the first heat exchange component 1a away from the second heat exchange component 1b along the parallel direction of the two heat exchange components 1, which can facilitate the arrangement of the inlet pipe 2 and the outlet pipe 3 in the heat exchange component 1. At the same time, it is also convenient to arrange the microchannel heat exchanger as a whole in the air conditioning system or other components that require heat exchange.

[0055] Optionally, there are multiple inlet pipes 2, and the multiple inlet pipes 2 are arranged at intervals along the length direction of the first header 12. The outlet pipe 3 is located between two of the multiple inlet pipes 2.

[0056] In the above implementation, multiple inlet pipes 2 can increase the number of inlets for the refrigerant to enter the heat exchange component, thereby increasing the amount of refrigerant inlet, and ultimately improving the heat exchange effect of the microchannel heat exchanger and improving the heat exchange efficiency.

[0057] Figure 5 It is a schematic diagram of the structure of the connecting plate, such as Figure 5As shown, optionally, the microchannel heat exchanger further includes two connecting plates 4, one connecting plate 4 is located between the two first headers 12 and is respectively connected to the two first headers 12. The other connecting plate 4 is located between the two second headers 13 and is respectively connected to the two second headers 13. Each connecting plate 4 has a flow hole 40, and the flow hole 40 is respectively connected to the two headers connected to the connecting plate 4.

[0058] In the above implementation, the connecting plate 4 can connect two first headers 12 arranged side by side or two second headers 13 arranged side by side to each other.

[0059] Moreover, the connection through the plate can improve the sealing performance, while improving the connection firmness between the two first collecting pipes 12 and reducing the thickness of the two heat exchange components.

[0060] In this embodiment, the connecting plate 4 is provided in a strip shape. The flow holes 40 are arranged in a straight line on the connecting plate 4. The first connecting plate 4 of the two connecting plates 4 is respectively welded and fixed to the two first headers 12. The second connecting plate 4 of the two connecting plates 4 is respectively welded and fixed to the two second headers 13.

[0061] The connecting plate 4 has arcuate surfaces 41 on opposite sides. The cross sections of the first header 12 and the second header 13 are both circular. The two arcuate surfaces 41 in the first of the two connecting plates 4 are respectively fitted with the outer walls of the two first headers 12. The two arcuate surfaces 41 in the second of the two connecting plates 4 are respectively fitted with the outer walls of the two second headers 13.

[0062] Of course, the contact surface between the connecting plate 4 and the corresponding header may also be set in other shapes, as long as it matches the shape of the first header 12 or the second header 13, and the present disclosure does not limit this.

[0063] That is, the microchannel heat exchanger in the embodiment of the present disclosure uses the connecting plate 4 to firmly connect the two first manifolds 12 arranged side by side or the two second manifolds 13 arranged side by side, thereby enhancing the welding stability and reliability of the first manifolds 12 or the second manifolds 13. On the premise that the heat exchange performance meets the requirements, the thickness of the microchannel heat exchanger can be reduced, greatly saving the space required for installation.

[0064] At the same time, the connection plate 4 adopts a method of opening a plurality of flow holes 40 to form a plurality of refrigerant flow processes, so that the refrigerant is distributed more evenly and the heat exchange effect is better.

[0065] In other examples, the two first headers 12 or the two second headers 13 may be connected without using the connecting plate 4. For example, the first headers 12 may be directly connected by using a connecting pipe or a connecting hole may be provided on the outer wall of the first header 12, and the two first headers 12 may be connected to each other through the connecting hole. All of the above methods may be used, as long as the two first headers 12 or the two second headers 13 can be connected, and the present disclosure does not limit this.

[0066] See again Figure 2 Optionally, the microchannel heat exchanger further comprises two isolation plate assemblies, each of which comprises a plurality of partitions 5, and the two isolation plate assemblies correspond to the two first headers 12 one by one. The number of the plurality of partitions 5 in each isolation plate assembly is the same as the number of the plurality of inlet pipes 2, and the plurality of partitions 5 in each isolation plate assembly are arranged in the corresponding first header 12 at intervals along the length direction of the first header 12, and the first header 12 is divided into a plurality of cavities.

[0067] Each inlet pipe 2 is connected to a cavity in the first header 12 in the first heat exchange component 1a, and the outlet pipe 3 is connected to a cavity in the first header 12 in the second heat exchange component 1b. The cavity connected to the outlet pipe 3 is located between the cavities connected to two inlet pipes 2.

[0068] In the above implementation, each inlet pipe 2 is connected to a cavity in the first header 12 in the first heat exchange component 1a, and the outlet pipe 3 is connected to a cavity in the first header 12 in the second heat exchange component 1b. The cavity connected to the outlet pipe 3 is located between the cavities connected to the inlet pipe 2, so that all the flat tubes 11 can be fully utilized, making the refrigerant distribution inside the microchannel heat exchanger more uniform, thereby enhancing the heat exchange effect.

[0069] Optionally, the inner diameter of the outlet pipe 3 is greater than the inner diameter of the inlet pipe 2 .

[0070] In the above implementation, since the refrigerant is in liquid state when entering the first header 12 from the inlet pipe 2, the volume of the refrigerant is small and the weight is large. In the process of the refrigerant passing through the flat tube 11 to reach the outlet pipe 3, the refrigerant gradually absorbs heat and changes from liquid to gas, the volume increases and the weight decreases. Therefore, the inner diameter of the outlet pipe 3 is larger than the inner diameter of the inlet pipe 2, so that the refrigerant after absorbing heat can be discharged more easily.

[0071] In this embodiment, in order to further facilitate the smooth circulation of the refrigerant, the number of flat tubes 11 corresponding to the cavity connected to the outlet tube 3 is greater than the number of flat tubes 11 corresponding to the cavity connected to any inlet tube 2. This is because the refrigerant is in liquid state when entering the first header 12 from the inlet tube 2, and the volume of the refrigerant is small and the weight is large. In the process of the refrigerant passing through the flat tubes 11 to reach the outlet tube 3, it gradually absorbs heat and changes from liquid to gas, and the volume increases and the weight decreases.

[0072] Optionally, the microchannel heat exchanger further includes fins connected to the flat tubes 11 and side plates located on both sides of the flat tubes, and in the length direction of the first collecting tube 12 , the fins are located between two adjacent flat tubes 11 , and the side plates are located on both sides of the flat tubes 11 .

[0073] The fins are non-windowed fins, and the density of the fins is FPI2 (i.e., multiple fins arranged per inch form 2 peaks) to FPI8 (i.e., 8 peaks per inch). The shape of the fins can be triangular, rectangular, or trapezoidal, and can be designed according to actual requirements. It should be noted that the side plates are located on both sides of the flat tubes 11, which means that the side plates are located on the outside of the two outermost flat tubes 11 in the flat tubes 11, and the side plates are not connected to the outermost flat tubes, and fins are arranged between the two.

[0074] The leeward side of the fin of the microchannel heat exchanger is flush with the edge of the same side of the flat tube 11, and the windward side extends outward along the arrangement direction of the two heat exchange components 1, and extends to make the width of the fin greater than the width of the flat tube 11. This arrangement, on the one hand, effectively increases the heat exchange area on the windward side, and on the other hand, the fins bulge outward to increase the ice and frost storage volume, making the microchannel heat exchanger less likely to be blocked by ice or frost. When defrosting and draining water, water is not easy to adhere and is easy to discharge.

[0075] Correspondingly, the leeward side of the side plate is also flush with the edge of the flat tube 11 on the same side, and the windward side also extends outward along the arrangement direction of the two heat exchange components 1 and is flush with the fins on the windward side. This arrangement not only facilitates assembly and fixation, but also prevents deformation and damage of the fins during installation.

[0076] In other examples, the width of the fin may also be set to be equal to the width of the flat tube 11, that is, the leeward side and the windward side of the fin are both flush with the corresponding side edges of the flat tube, which is not limited in the present disclosure.

[0077] The following is a brief introduction to the working process of the microchannel heat exchanger provided in the embodiment of the present disclosure:

[0078] First, after the refrigerant enters the first header 12 in the first heat exchange assembly 1a through the inlet pipe 2, a portion of the refrigerant directly flows through the multiple rows of flat tubes 11 in the first group to the second header 13. The refrigerant then flows from the second header 13 into the multiple rows of flat tubes 11 in the second group and returns to flow into the first header 12 (the multiple rows of flat tubes 11 in the first group and the multiple rows of flat tubes 11 in the second group are separated by a partition 5).

[0079] Then, the refrigerant returning to flow into the first header 12 enters the adjacent first header 12 through the flow holes 40 on the connecting plate 4, and flows toward the cavity where the outlet pipe 3 is located. Another part of the refrigerant in the first header 12 flows into the adjacent first header 12 through the flow holes 40 on the connecting plate 4, then enters the second heat exchange assembly 1b and flows to the second header 13, and then flows from the second header 13 into the flat tubes 11 and returns to flow into the first header 12.

[0080] Finally, all the refrigerants are collected at the outlet pipe 3 and flow out.

[0081] Since the outlet pipe 3 passes through the first collecting pipe 12 in the first heat exchange component 1a, and the refrigerant in the first collecting pipe 12 in the first heat exchange component 1a is a low-temperature refrigerant, the refrigerant in the outlet pipe 3 (high-temperature refrigerant) will quickly exchange heat with the low-temperature refrigerant in the first collecting pipe 12 in the first heat exchange component 1a, thereby reducing the outlet temperature of the refrigerant in the outlet pipe 3, which helps to reduce the suction temperature of the compressor and improve the system performance.

[0082] The above description is only an optional embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A microchannel heat exchanger, characterized in that: The microchannel heat exchanger comprises two heat exchange components (1), an inlet pipe (2) and an outlet pipe (3); Each of the two heat exchange assemblies (1) comprises a first header (12), a second header (13) and a plurality of flat tubes (11); for any of the heat exchange assemblies (1), the first header (12) and the second header (13) are arranged in parallel with each other, and one end of each of the plurality of flat tubes (11) is connected to the first header (12), and the other end of each of the flat tubes (11) is connected to the second header (13); the plurality of flat tubes (11) are parallel to each other and are arranged at intervals along the length direction of the first header (12); The two heat exchange components (1) are arranged side by side, and the arrangement direction of the two heat exchange components (1), the length direction of the flat tubes (11) and the length direction of the first header (12) are perpendicular to each other, and the first headers (12) in the two heat exchange components (1) are located at the same end of the flat tubes (11); The two heat exchange components (1) include a first heat exchange component (1a) and a second heat exchange component (1b); the inlet pipe (2) is connected to a first header (12) in the first heat exchange component (1a); a portion of the outlet pipe (3) is located in the first header (12) in the first heat exchange component (1a) and is connected to the first header (12) in the second heat exchange component (1b).

2. The microchannel heat exchanger according to claim 1, characterized in that: The outlet pipe (3) comprises an insertion section (31) and a connection section (32) which are connected to each other; One end of the insertion section (31) is sealedly connected to the first collecting pipe (12) in the first heat exchange component (1a), and the middle part of the insertion section (31) is located in the first collecting pipe (12) in the first heat exchange component (1a). The other end of the insertion section (31) is sealedly connected to the first collecting pipe (12) in the second heat exchange component (1b), and the other end of the insertion section (31) is communicated with the first collecting pipe (12) in the second heat exchange component (1b). The connecting section (32) is located outside the two heat exchange components (1), and one end of the connecting section (32) is connected to the insertion section (31).

3. The microchannel heat exchanger according to claim 2, characterized in that: The connecting section (32) comprises a clamping section (321) and a main section (322) which are connected to each other, and an outer wall of one end of the clamping section (321) close to the insertion section (31) has an annular inner flange (320), and the inner flange (320) is in contact with the outer wall of the first collecting pipe (12) in the first heat exchange component (1a).

4. The microchannel heat exchanger according to claim 3, characterized in that: The clamping section (321) comprises a first expanding section (3211), a middle section (3212) and a contracting section (3213); One end of the first flared section (3211) is connected to the insertion section (31), and the other end of the first flared section (3211) is connected to one end of the middle section (3212), and the inner diameter of the first flared section (3211) gradually increases along the direction from the first flared section (3211) to the middle section (3212); The other end of the middle section (3212) is connected to the necking section (3213), and the other end of the necking section (3213) is sleeved outside the main section (322), and along the direction from the middle section (3212) to the necking section (3213), the inner diameter of a part of the tube section of the necking section (3213) gradually decreases; The inner flange (320) is formed at the connection between the first flared section (3211) and the middle section (3212).

5. The microchannel heat exchanger according to claim 4, characterized in that: The snap-on section (321) further comprises a second expanding section (3214), wherein the second expanding section (3214) is located outside the main section (322) and is connected to the other end of the necking section (3213), and the inner diameter of the second expanding section (3214) gradually decreases along the direction from the second expanding section (3214) to the necking section (3213).

6. The microchannel heat exchanger according to any one of claims 1 to 5, characterized in that: The inlet pipe (2) and the outlet pipe (3) are located on a side of the first heat exchange component (1a) away from the second heat exchange component (1b) along the arrangement direction of the two heat exchange components (1).

7. The microchannel heat exchanger according to any one of claims 1 to 5, characterized in that: There are a plurality of inlet pipes (2), and the plurality of inlet pipes (2) are arranged at intervals along the length direction of the first header (12); The outlet pipe (3) is located between two of the inlet pipes (2) among the plurality of inlet pipes (2).

8. The microchannel heat exchanger according to any one of claims 1 to 5, characterized in that: The microchannel heat exchanger further comprises two connecting plates (4), one of the two connecting plates (4) being located between the two first headers (12) and respectively connected to the two first headers (12); The other connecting plate (4) of the two connecting plates (4) is located between the two second current collecting pipes (13) and is respectively connected to the two second current collecting pipes (13); Each of the two connecting plates (4) has a circulation hole (40), and the circulation hole (40) is respectively connected to two collecting pipes connected to the connecting plate (4).

9. The microchannel heat exchanger according to any one of claims 1 to 5, characterized in that: The microchannel heat exchanger further comprises two isolation plate assemblies, each of the two isolation plate assemblies comprises a plurality of partitions (5), the two isolation plate assemblies correspond to the two first headers (12) respectively, and the plurality of partitions (5) in each isolation plate assembly are arranged at intervals in the corresponding first header (12) along the length direction of the first header (12) to divide the first header (12) into a plurality of cavities; Each of the inlet pipes (2) is connected to a cavity in the first header (12) in the first heat exchange component (1a), and the outlet pipe (3) is connected to a cavity in the first header (12) in the second heat exchange component (1b); the cavity connected to the outlet pipe (3) is located between the cavities connected to two of the inlet pipes (2).

10. The microchannel heat exchanger according to any one of claims 1 to 5, characterized in that: The inner diameter of the outlet pipe (3) is greater than the inner diameter of the inlet pipe (2).

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