Micro-channel heat exchanger and air conditioning system

Abstract

The invention provides a micro-channel heat exchanger and an air conditioning system, and belongs to the technical field of heat exchange. The micro-channel heat exchanger comprises a gas pipeline, a liquid pipeline, a plurality of heat exchange pipes and a plurality of liquid connectors. The first ends of the plurality of heat exchange pipes are communicated with the gaseous pipeline, and each heat exchange pipe is of a flat pipe structure; the first ends of the multiple liquid state connectors communicate with the liquid state pipeline, the second end of each liquid state connector communicates with the second end of at least one heat exchange pipe, each liquid state connector is of a tubular structure, and the axial direction of the liquid state connectors is parallel to the width direction of the heat exchange pipes. By the adoption of the method and device, the filling amount of the refrigerant is reduced, and then the safety of the air conditioning system is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of heat exchange, and particularly to a microchannel heat exchanger and an air conditioning system. Background Art

[0002] With the increasing number of air conditioning systems using natural refrigerants, microchannel heat exchangers have gradually emerged. A microchannel heat exchanger can reduce the refrigerant charge while ensuring a certain heat exchange efficiency. Since some natural refrigerants are flammable and explosive, reducing the refrigerant charge can effectively improve the safety of the air conditioning system during use.

[0003] A microchannel heat exchanger generally includes a header pipe, a manifold, a plurality of heat exchange tubes, a gaseous pipeline, and a liquid pipeline. The heat exchange tubes are located between the header pipe and the manifold, and two ports of the heat exchange tubes are respectively connected and communicated with the header pipe and the manifold. The header pipe is also communicated with the gaseous pipeline, and the manifold is also communicated with the liquid pipeline. When the microchannel heat exchanger acts as a condenser, the header pipe is used to accommodate the gaseous refrigerant flowing in from the gaseous pipeline and transport the gaseous refrigerant into the heat exchange tubes for heat exchange. The manifold is used to accommodate the liquid refrigerant flowing out of the heat exchange tubes and transport the liquid refrigerant to flow out through the liquid pipeline. When the microchannel heat exchanger acts as an evaporator, the manifold is used to accommodate the liquid refrigerant flowing in from the liquid pipeline and transport the liquid refrigerant into the heat exchange tubes for heat exchange. The header pipe is used to accommodate the gaseous refrigerant flowing out of the heat exchange tubes and transport the gaseous refrigerant to flow out through the gaseous pipeline.

[0004] The heat exchange tubes are flat tubes. Since the axial direction of the heat exchange tubes is perpendicular to the axial directions of the manifold and the header pipe, and the width direction of the heat exchange tubes (i.e., the width direction of the flat tubes) is also perpendicular to the axial directions of the manifold and the header pipe, the diameters of the manifold and the header pipe are both set to be larger than the width of the heat exchange tubes. However, this results in larger volumes of the manifold and the header pipe, thereby increasing the refrigerant charge and reducing the safety of the air conditioning system during use. Summary of the Invention

[0005] Embodiments of the present disclosure provide a microchannel heat exchanger and an air conditioning system, which can reduce the refrigerant charge and thus improve the safety of the air conditioning system. The technical solutions are as follows:

[0006] On the one hand, embodiments of the present disclosure provide a microchannel heat exchanger, which includes a gaseous pipeline, a liquid pipeline, a plurality of heat exchange tubes, and a plurality of liquid connectors;

[0007] The first ends of the plurality of heat exchange tubes are all communicated with the gaseous pipeline, and the heat exchange tubes have a flat tube structure;

[0008] The first ends of the multiple liquid connectors are all communicated with the liquid pipeline, the second end of each liquid connector is communicated with the second end of at least one of the heat exchange tubes, the liquid connector has a tubular structure, and the axis of the liquid connector is parallel to the width direction of the heat exchange tube.

[0009] In a possible implementation manner, the microchannel heat exchanger further includes a plurality of first connecting pipes and a distributor, and the distributor has a plurality of distribution ports and a delivery port;

[0010] The first end of each first connecting pipe is respectively communicated with a different liquid connector, the second end of each first connecting pipe is respectively communicated with a different distribution port, and the delivery port is communicated with the liquid pipeline.

[0011] In a possible implementation manner, the microchannel heat exchanger further includes a plurality of second connecting pipes;

[0012] The multiple liquid connectors are connected in series through the multiple second connecting pipes, and one of the multiple liquid connectors is directly communicated with the liquid pipeline.

[0013] In a possible implementation manner, each liquid connector is communicated with a plurality of heat exchange tubes, and the plurality of heat exchange tubes communicated with the same liquid connector are arranged along the axis of the liquid connector.

[0014] In a possible implementation manner, the microchannel heat exchanger further includes a gas collecting pipe and a fixing plate;

[0015] The gas collecting pipe is respectively communicated with the first ends of the plurality of heat exchange tubes and the gas pipeline;

[0016] The fixing plate is located on the side of the plurality of heat exchange tubes away from the gas collecting pipe, and the fixing plate is connected to the plurality of heat exchange tubes.

[0017] In a possible implementation manner, the multiple liquid connectors are located between the fixing plate and the gas collecting pipe.

[0018] In a possible implementation manner, the fixing plate has a plurality of first through holes, the second end of each heat exchange tube passes through a different first through hole and extends to the side of the fixing plate away from the gas collecting pipe, and the multiple liquid connectors are located on the side of the fixing plate away from the gas collecting pipe.

[0019] In a possible implementation manner, the heat exchange tube has a bent structure;

[0020] The gas collecting pipe has a plurality of second through holes in the radial direction, the second end of each heat exchange tube passes through a different second through hole and extends to the side of the gas collecting pipe away from the fixing plate, and the multiple liquid connectors are located on the side of the gas collecting pipe away from the fixing plate.

[0021] In a possible implementation, the microchannel heat exchanger further includes a plurality of gaseous connectors;

[0022] The first ends of the plurality of gaseous connectors are all communicated with the gaseous pipeline, the second end of each gaseous connector is communicated with the first end of at least one of the heat exchange tubes, the gaseous connector has a tubular structure, and the axial direction of the gaseous connector is parallel to the width direction of the heat exchange tube.

[0023] In a possible implementation, the microchannel heat exchanger further includes a plurality of third connecting pipes;

[0024] The plurality of gaseous connectors are connected in series through the plurality of third connecting pipes, and one of the plurality of gaseous connectors is directly communicated with the gaseous pipeline.

[0025] On the other hand, an embodiment of the present disclosure provides an air conditioning system, and the air conditioning system includes the microchannel heat exchanger as described in any one of the above.

[0026] The technical solutions provided by the embodiments of the present disclosure at least include the following beneficial effects:

[0027] The embodiment of the present disclosure provides a microchannel heat exchanger. In this microchannel heat exchanger, a plurality of liquid connectors are used to represent the header pipes in the related art, and the axial direction of the liquid connectors is parallel to the width direction of the heat exchange tubes. Therefore, the diameter of the liquid connectors only needs to be larger than the thickness of the heat exchange tubes, and there is no need for the diameter of the header pipes to be larger than the width of the heat exchange tubes as in the related art. In this way, the diameter of the liquid connectors can be set relatively small, so that the volume of the liquid connectors is small, and the diameter of the connecting pipes communicated with the liquid connectors can also be set relatively small. In this way, the total volume of the plurality of liquid connectors and the connecting pipes communicated with them will also be much smaller than the volume of the header pipes in the related art, thereby reducing the refrigerant filling amount and further improving the safety of the air conditioning system.

[0028] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0030] Figure 1 is a schematic structural diagram of a header pipe and a heat exchange tube in the related art shown in the embodiment of the present disclosure;

[0031] Figure 2 It is a schematic structural diagram of a microchannel heat exchanger shown in an embodiment of the present disclosure;

[0032] Figure 3 is shown in an embodiment of the present disclosure Figure 2 Partial enlarged structural diagram of part A therein;

[0033] Figure 4 It is a schematic structural diagram of a heat exchange tube and a liquid joint shown in an embodiment of the present disclosure;

[0034] Figure 5 It is a schematic structural diagram of a heat exchange tube and a liquid joint shown in an embodiment of the present disclosure;

[0035] Figure 6 It is a schematic structural diagram of a microchannel heat exchanger shown in an embodiment of the present disclosure;

[0036] Figure 7 is shown in an embodiment of the present disclosure Figure 6 Partial enlarged structural diagram of part B therein;

[0037] Figure 8 It is a schematic structural diagram of a microchannel heat exchanger shown in an embodiment of the present disclosure;

[0038] Figure 9 It is a schematic structural diagram of a microchannel heat exchanger shown in an embodiment of the present disclosure;

[0039] Figure 10 It is a schematic structural diagram of a microchannel heat exchanger shown in an embodiment of the present disclosure;

[0040] Figure 11 is shown in an embodiment of the present disclosure Figure 10 Partial enlarged structural diagram of part C therein;

[0041] Figure 12 It is a schematic structural diagram of a microchannel heat exchanger shown in an embodiment of the present disclosure;

[0042] Figure 13 is shown in an embodiment of the present disclosure Figure 12 Partial enlarged structural diagram of part D therein.

[0043] Legend Explanation

[0044] Related Technologies

[0045] 110. Header; 120. Heat exchange tube;

[0046] The Present Disclosure

[0047] 1. Gas pipeline; 2. Liquid pipeline; 3. Heat exchange tube; 4. Liquid joint; 5. First connecting pipe; 6. Distributor; 7. Second connecting pipe; 8. Gas collector pipe; 9. Fixed plate; 10. Gas joint; 11. Third connecting pipe;

[0048] 81. Second through hole; 91. First through hole;

[0049] m. Axial direction of the liquid structure; n. Width direction of the heat exchange tube. Detailed implementation mode

[0050] Unless otherwise defined, the technical terms or scientific terms used herein shall have the ordinary meanings understood by those of ordinary skill in the art to which this disclosure pertains. The terms "first", "second", "third" and similar terms used in the specification and claims of this patent application of the disclosure do not denote any order, quantity or importance, but are only used to distinguish different components. Similarly, the terms such as "a" or "one" do not denote a quantity limitation, but mean that there is at least one. The terms such as "comprising" or "including" mean that the elements or objects appearing before "comprising" or "including" cover the elements or objects listed after "comprising" or "including" and their equivalents, and do not exclude other elements or objects. The terms such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms such as "upper", "lower", "left" and "right" are only used to represent relative position relationships, and when the absolute position of the object being described changes, the relative position relationships may also change accordingly.

[0051] To make the purpose, technical solutions and advantages of this disclosure clearer, the embodiments of this disclosure will be further described in detail below with reference to the accompanying drawings.

[0052] In the related art, as Figure 1 shown, the axial direction of the header pipe 110 is perpendicular to the width direction of the heat exchange tube 120, and the diameter of the header pipe 110 needs to be greater than the width L1 of the heat exchange tube 120, resulting in a relatively large diameter of the header pipe 110, and further resulting in a relatively large volume of the header pipe 110, leading to a relatively large refrigerant filling amount during the use of the air-conditioning system. Some natural refrigerants are flammable and explosive, posing a relatively large safety risk.

[0053] To solve the above technical problems, the embodiments of this disclosure provide a microchannel heat exchanger, as Figure 2 and Figure 3 shown, the microchannel heat exchanger includes a gas pipeline 1, a liquid pipeline 2, a plurality of heat exchange tubes 3 and a plurality of liquid joints 4.

[0054] Among them, the gaseous pipeline 1 is used to transport gaseous refrigerant, and the liquid pipeline 2 is used to transport liquid refrigerant. It can be understood that the working medium transported by the gaseous pipeline 1 can include gaseous refrigerant or refrigerant in a gas-liquid two-phase state. Of course, the working medium transported in the liquid pipeline 2 can also only include liquid refrigerant or can also include refrigerant in a gas-liquid two-phase state.

[0055] When the microchannel heat exchanger acts as a condenser, the gaseous pipeline 1 is used to transport the gaseous refrigerant flowing in from other devices of the air-conditioning system to the heat exchange tubes 3 for heat exchange, and the liquid pipeline 2 is used to transport the liquid refrigerant flowing out of the heat exchange tubes 3 to other devices of the air-conditioning system. When the microchannel heat exchanger acts as an evaporator, the liquid pipeline 2 is used to transport the liquid refrigerant flowing in from other devices of the air-conditioning system to the heat exchange tubes 3 for heat exchange, and the gaseous pipeline 1 is used to transport the gaseous refrigerant flowing out of the heat exchange tubes 3 to other devices of the air-conditioning system.

[0056] The heat exchange tubes 3 have opposite ends, that is, the first end of the heat exchange tube 3 and the second end of the heat exchange tube 3. The first ends of the plurality of heat exchange tubes 3 are all communicated with the gaseous pipeline 1. The second ends of the plurality of liquid connectors 4 are all communicated with the liquid pipeline 2, and the second end of each liquid connector 4 is communicated with the second end of at least one heat exchange tube 3. In this way, each liquid connector 4 communicates between the liquid pipeline 2 and the corresponding heat exchange tube 3.

[0057] In the embodiments of the present disclosure, as Figure 3 and Figure 4 shown, the heat exchange tube 3 has a flat tube structure, the liquid connector 4 has a tubular structure, and the axial direction m of the liquid connector 4 is parallel to the width direction n of the heat exchange tube 3.

[0058] Since the axial direction m of the liquid connector 4 is parallel to the width direction n of the heat exchange tube 3, therefore, as Figure 5 shown, the diameter of the liquid connector 4 only needs to be greater than the thickness L2 of the heat exchange tube 3, rather than greater than the width L1 of the heat exchange tube 3. Therefore, the liquid connector 4 can be set to have a relatively small diameter. In this way, the volume of the liquid connector 4 is greatly reduced, and the diameter of the connecting pipe (for example, the first connecting pipe 5 or the second connecting pipe 7 introduced later) communicated with the liquid connector 4 can also be set relatively small. In this way, the total volume of the plurality of liquid connectors 4 and the connecting pipes will be much smaller than the volume of the manifold 110 in the related art, thereby reducing the refrigerant filling amount during the use of the air-conditioning system, and further improving the safety of the air-conditioning system.

[0059] Moreover, since the density of the liquid refrigerant is much greater than the density of the gaseous refrigerant, therefore, the liquid connector 4 in the embodiments of the present disclosure can reduce the filling amount of the liquid refrigerant. In this way, the total filling amount of the refrigerant can be further reduced, and the safety of the air-conditioning system is improved.

[0060] In a possible implementation, the microchannel heat exchanger may further include a plurality of fins, which are connected to the heat exchange tubes 3 and are used to improve the heat exchange efficiency between the heat exchange tubes 3 and the external environment.

[0061] In the embodiments of the present disclosure, there can be various reasonable settings for the structure of the connection between the liquid connector 4 and the liquid pipeline 2. Hereinafter, an introduction will be given to it:

[0062] In a possible implementation, as Figure 2 and Figure 3 shown, the microchannel heat exchanger may further include a plurality of first connecting pipes 5 and a distributor 6. The distributor 6 may have a plurality of distribution ports 61 and a delivery port 62. Among them, the number of the distribution ports 61 may be the same as the number of the liquid connectors 4.

[0063] The first connecting pipe 5 has opposite ends, namely, the first end of the first connecting pipe 5 and the second end of the first connecting pipe 5.

[0064] The first end of each first connecting pipe 5 is respectively communicated with a different liquid connector 4, the second end of each first connecting pipe 5 is respectively communicated with a different distribution port 61, and the delivery port 62 is communicated with the liquid pipeline 2. In this way, each liquid connector 4 can be communicated with the liquid pipeline 2 through a first connecting pipe 5.

[0065] Moreover, when the microchannel heat exchanger acts as an evaporator, the distributor 6 can uniformly deliver the liquid refrigerant flowing into the liquid pipeline 2 to a plurality of delivery ports 62, so that the flow rate of the liquid refrigerant flowing into each liquid connector 4 is the same, thereby realizing the uniform flow in the microchannel heat exchanger and improving the heat exchange efficiency of the microchannel heat exchanger.

[0066] Among them, the position of the distributor 6 relative to the heat exchange tubes 3 and the extending direction of the first connecting pipes 5 can be set according to actual needs. Figure 3 Only one possible structural setting is shown, and the embodiments of the present disclosure do not make specific limitations thereto.

[0067] It can be understood that the total volume of the plurality of liquid connectors 4, the plurality of first connecting pipes 5 and the distributor 6 can be set to be relatively small, making it much smaller than the volume of the manifold 110 in the related art, thereby reducing the refrigerant filling amount.

[0068] Regarding the setting of the connection position between the liquid connector 4 and other devices, it can be as Figure 3As shown, since the axial direction m of the liquid joint 4 is parallel to the width direction of the heat exchange tube 3, the liquid joint 4 can be arranged at the end of the second end of the heat exchange tube 3. The outer side wall of the liquid joint 4 is communicated with the second end of the heat exchange tube 3, and one end of the liquid joint 4 is communicated with the first end of the first connecting pipe 5. Of course, other reasonable communication arrangements are also possible, and the embodiments of the present disclosure do not limit this.

[0069] In another possible implementation, as Figure 6 and Figure 7 shown, the microchannel heat exchanger may further include a plurality of second connecting pipes 7.

[0070] A plurality of liquid joints 4 are connected in series through a plurality of second connecting pipes 7, and one of the plurality of liquid joints 4 is directly communicated with the liquid pipeline 2. As Figure 7 shown, the plurality of liquid joints 4 are arranged along the thickness direction of the heat exchange tube 3, and each two adjacent liquid joints 4 are communicated through a second connecting pipe 7. In this way, the communication between the plurality of liquid joints 4 is realized, and the liquid joint 4 at the outermost end is directly communicated with the liquid pipeline 2, thereby realizing the communication between the plurality of liquid joints 4 and the liquid pipeline 2.

[0071] Among them, the position of the second connecting pipe 7 can be any position that does not interfere with devices such as the heat exchange tube 3, and the embodiments of the present disclosure do not specifically limit it.

[0072] In the embodiments of the present disclosure, the heat exchange tube 3 may have a bent structure. When the number of bends of its bent structure is odd, the liquid pipeline 2 and the gas pipeline 1 are located on the same side close to the heat exchange tube 3. For example Figure 6 and Figure 7 shown, the number of bends of the heat exchange tube 3 is 1. At this time, the second connecting pipe 7 can be located at any position that does not interfere with the heat exchange tube 3.

[0073] When the number of bends of the heat exchange tube 3 is even, the liquid pipeline 2 and the gas pipeline 1 are located on different sides close to the heat exchange tube 3. For example Figure 8 and Figure 9 shown in the microchannel heat exchanger. At this time, the bent part of the bent structure of the heat exchange tube 3 can be arranged at a position that does not interfere with the second connecting pipe 7, and the two can be set according to requirements.

[0074] The above are only several possible structures of the communication structure between the liquid joint 4 and the liquid pipeline 2 in the embodiments of the present disclosure, and it can also be other any reasonable structural settings, which are not limited by the embodiments of the present disclosure.

[0075] In the embodiments of the present disclosure, each liquid joint 3 can be only communicated with the second end of one heat exchange tube 3. For example, as Figure 8The microchannel heat exchanger shown, or each liquid connector 4 can communicate with the second ends of multiple heat exchange tubes 3. For example, as Figure 9 shown in the microchannel heat exchanger, it can be set according to the actual layout, and the embodiments of the present disclosure do not limit this.

[0076] For the case where each liquid connector 4 communicates with the second ends of multiple heat exchange tubes 3, there can be various different structural settings. Below, an introduction is given to them:

[0077] In a possible implementation manner, multiple heat exchange tubes 3 are arranged along the thickness direction of the heat exchange tube 3. Each liquid connector 4 communicates with multiple heat exchange tubes 3, and the multiple heat exchange tubes 3 communicating with the same liquid connector 4 still are arranged along the thickness direction of the heat exchange tube 3. For example, as Figure 9 shown in the microchannel heat exchanger, where each liquid connector 4 communicates with two heat exchange tubes 3.

[0078] In another possible implementation manner, each liquid connector 4 communicates with multiple heat exchange tubes 3, and the multiple heat exchange tubes 3 communicating with the same liquid connector 4 are arranged along the axial direction m of the liquid connector 4.

[0079] In other words, these multiple heat exchange tubes 3 can form a multi-row tube heat pipe group, and this multi-row heat exchange tube group is arranged along the axial direction m of the liquid connector 4. In a heat exchange tube group, it includes multiple heat exchange tubes 3 arranged along the thickness direction of the heat exchange tube 3, and the position of each heat exchange tube 3 in this heat exchange tube group is directly opposite to the position of one heat exchange tube 3 in other heat exchange tube groups. In this way, the heat exchange tubes 3 with directly opposite positions (the heat exchange tubes 3 arranged along the axial direction m of the liquid connector 4) in multiple heat exchange tube groups can communicate with the same liquid connector 4. In this way, the total volume of all liquid connectors 4 can be reduced, and thus the refrigerant filling amount can be reduced, improving safety.

[0080] Among them, the number of heat exchange tube groups can be set according to requirements. For example, as Figure 2 、 Figure 3 、 Figure 6 、 Figure 7 shown in the microchannel heat exchanger includes two rows of heat exchange tube groups. Of course, it can also include three rows, four rows, etc. The embodiments of the present disclosure do not limit this.

[0081] The structure in which the liquid connector 4 in the embodiments of the present disclosure communicates with multiple heat exchange tubes 3 can be any one of the above two structures, or can also implement the above two structures simultaneously, that is, the multiple heat exchange tubes 3 communicating with the same liquid connector 3 include both multiple heat exchange tubes 3 arranged along the axial direction m of the liquid connector 4 and multiple heat exchange tubes 3 arranged along the thickness direction of the heat exchange tube 3. The embodiments of the present disclosure do not limit this.

[0082] In the embodiments of the present disclosure, as Figure 2, Figure 3 , Figure 6 and Figure 7 As shown in and

[0083] , the microchannel heat exchanger may further include a header pipe 8 and a fixing plate 9.

[0083] The header pipe 8 is respectively connected to the first ends of a plurality of heat exchange pipes 3 and the gaseous pipeline 1. In this way, the header pipe 8 can connect the first ends of the heat exchange pipes 3 and the gaseous pipeline 1, so as to convey gaseous refrigerant between the heat exchange pipes 3 and the gaseous pipeline 1.

[0084] The fixing plate 9 is located on the side of the plurality of heat exchange pipes 3 away from the header pipe 8, and the fixing plate 9 is connected to the plurality of heat exchange pipes 3.

[0085] In this way, the plurality of heat exchange pipes 3 are located between the header pipe 8 and the fixing plate 9, and the header pipe 8 and the fixing plate 9 together support and fix the heat exchange pipes 3.

[0086] For this structure, the liquid connectors 4 can be located at different positions. Next, the position setting of the liquid connectors 4 will be introduced:

[0087] In a possible implementation manner, a plurality of liquid connectors 4 can be located between the fixing plate 9 and the header pipe 8. That is: the first ends of the heat exchange pipes 3 are connected and communicated with the header pipe 9. Regardless of whether the heat exchange pipes 3 have a bent structure and regardless of the number of bends of the bent structure, the second ends of the heat exchange pipes 3 are always located between the header pipe 8 and the fixing plate 9. At this time, the liquid connectors 4 can also be arranged between the header pipe 8 and the fixing plate 9, as shown in Figure 2 , Figure 3 , Figure 6 and Figure 7 . Figure 2 , Figure 3 , Figure 6 and Figure 7 shown.

[0088] Of course, when the number of bends of the bent structure of the heat exchange pipe 3 is odd, the second end of the heat exchange pipe 3 is located near the header pipe 8, then the liquid connectors 4 can also be arranged near the header pipe 8, as shown in Figure 3 and Figure 7 . Figure 3 and Figure 7 shown.

[0089] When the number of bends of the bent structure of the heat exchange pipe 3 is even, the second end of the heat exchange pipe 3 is located near the fixing plate 9, then the liquid connectors 4 can also be arranged near the fixing plate 9.

[0090] In another possible implementation manner, as shown in Figure 10 and Figure 11 , the fixing plate 9 may have a plurality of first through holes 91. The second end of each heat exchange pipe 3 passes through a different first through hole 91 and extends to the side of the fixing plate 9 away from the header pipe 8, and a plurality of liquid connectors 4 are located on the side of the fixing plate 9 away from the header pipe 8.

[0091] ​​​​In this way, since the second end of the heat exchange tube 3 is located on the side of the fixing plate 9 away from the gas collecting pipe 8, therefore, the liquid connector 4 connected and communicating with the heat exchange tube 3 can also be arranged on the side of the fixing plate 9 away from the gas collecting pipe 8. In this way, the liquid connector 4 will not occupy the space between the fixing plate 9 and the gas collecting pipe 8, and the space between the fixing plate 9 and the gas collecting pipe 8 can be fully used to accommodate the heat exchange tube 3, increasing the occupied area of the heat exchange tube 3, thereby improving the heat exchange efficiency.

[0092] For such a structure, the above setting can be carried out when the number of bends of the bending structure of the heat exchange tube 3 is an even number. When the number of bends is an even number, the second end of the heat exchange tube 3 is located close to the fixing plate 9. At this time, a first through hole 91 can be arranged on the fixing plate 9, and the second end of the heat exchange tube 3 passes through the first through hole 91. For example, Figure 10 and Figure 11 the number of bends of the heat exchange tube 3 shown is two.

[0093] In another possible implementation, as shown in Figure 12 and Figure 13 the gas collecting pipe 8 has a plurality of second through holes 81 in the radial direction. The second end of the Megger heat exchange tube 3 passes through different second through holes 81 and extends to the side of the gas collecting pipe 8 away from the fixing plate 9. A plurality of liquid connectors 4 are located on the side of the gas collecting pipe 8 away from the fixing plate 9.

[0094] In this way, since the second end of the heat exchange tube 3 is located on the side of the gas collecting pipe 8 away from the fixing plate 9, therefore, the liquid connector 4 connected and communicating with the heat exchange tube 3 can also be arranged on the side of the gas collecting pipe 8 away from the fixing plate 9. In this way, the liquid connector 4 will not occupy the space between the fixing plate 9 and the gas collecting pipe 8, and the space between the fixing plate 9 and the gas collecting pipe 8 can be fully used to accommodate the heat exchange tube 3, increasing the occupied area of the heat exchange tube 3, thereby improving the heat exchange efficiency.

[0095] For such a structure, the above setting can be carried out when the number of bends of the bending structure of the heat exchange tube 3 is an odd number. When the number of bends is an odd number, the second end of the heat exchange tube 3 is located close to the gas collecting pipe 8. At this time, a second through hole 81 can be arranged on the gas collecting pipe 8, and the second end of the heat exchange tube 3 passes through the second through hole 81. For example, Figure 12 and Figure 13 the number of bends of the heat exchange tube 3 shown is one.

[0096] The above are only several possible position settings of the liquid connector 4. The liquid connector 4 in the embodiments of the present disclosure can also be located at other arbitrarily reasonable positions, and the embodiments of the present disclosure do not limit this.

[0097] In the embodiments of the present disclosure, as shown in Figure 8 and Figure 9As shown, the microchannel heat exchanger may further include a gaseous connector 10. The first ends of a plurality of gaseous connectors 10 are all connected to the gaseous pipeline 1, and the second end of each gaseous connector 10 is connected to the first end of at least one heat exchange tube 3.

[0098] The gaseous connector 10 has a tubular structure, and the axial direction of the gaseous connector 10 is parallel to the width direction n of the heat exchange tube 3. In this way, the diameter of the gaseous structure 10 only needs to be greater than the thickness L2 of the heat exchange tube 3, without the need to be greater than the width L1 of the heat exchange tube 3. Therefore, the gaseous connector 10 can be set to have a relatively small diameter. In this way, the volume of the gaseous connector 10 is greatly reduced, and the diameter of the connecting pipe (for example, the third connecting pipe 11 introduced later) connected to the gaseous connector 10 can also be set to be relatively small. In this way, the total volume of the plurality of gaseous connectors 10 and the connecting pipes will also be much smaller than the volume of the gas collecting pipe 8, thereby further reducing the refrigerant filling amount during the use of the air conditioning system, and thus improving the safety of the air conditioning system.

[0099] In a possible implementation manner, as Figure 8 and Figure 9 shown, the microchannel heat exchanger may further include a plurality of third connecting pipes 11.

[0100] A plurality of gaseous connectors 10 can be connected in series through a plurality of third connecting pipes 11, and one of the plurality of gaseous connectors 10 is directly connected to the gaseous pipeline 1. As Figure 8 and Figure 9 shown, the plurality of gaseous connectors 10 are arranged along the thickness direction of the heat exchange tube 3, and each two adjacent gaseous connectors 10 are connected through a third connecting pipe 11. In this way, the connection between the plurality of gaseous connectors 10 is realized, and one of the gaseous connectors 10 is directly connected to the gaseous pipeline 1, thereby realizing the connection between the plurality of gaseous connectors 10 and the gaseous pipeline 1.

[0101] Among them, the position of the third connecting pipe 11 can be any position that will not cause interference to devices such as the heat exchange tube 3, and the embodiments of the present disclosure do not limit this.

[0102] The embodiments of the present disclosure also provide an air conditioning system, and this air conditioning system may include the microchannel heat exchanger described in any one of the above.

[0103] The technical solutions provided by the embodiments of the present disclosure at least include the following beneficial effects:

[0104] Embodiments of the present disclosure provide a microchannel heat exchanger. In this microchannel heat exchanger, a plurality of liquid connectors 4 are used to represent the header pipes in the related art. The axial direction m of the liquid connector 4 is parallel to the width direction of the heat exchange tube 3. Therefore, the diameter of the liquid connector 4 only needs to be larger than the thickness L1 of the heat exchange tube 3, instead of being larger than the width of the heat exchange tube 2 like the diameter of the header pipe. In this way, the diameter of the liquid connector 4 can be set relatively small, so that the volume of the liquid connector 4 is small, and the diameter of the connecting pipe communicating with the liquid connector 4 can also be set relatively small. In this way, the total volume of the plurality of liquid connectors 4 and the connecting pipes communicating with them is also much smaller than the volume of the header pipe in the related art, thereby reducing the refrigerant charge and improving the safety of the air conditioning system.

[0105] The above are only optional embodiments of the present disclosure and are not intended to limit the present disclosure. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle 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 includes a gaseous pipeline (1), a liquid pipeline (2), a plurality of heat exchange tubes (3), and a plurality of liquid connectors (4); The first ends of the plurality of heat exchange tubes (3) are all communicated with the gaseous pipeline (1), and the heat exchange tubes (3) have a flat tube structure; The first ends of the plurality of liquid connectors (4) are all communicated with the liquid pipeline (2), the second end of each liquid connector (4) is communicated with the second end of at least one of the heat exchange tubes (3), the liquid connector (4) has a tubular structure, and the axis (m) of the liquid connector (4) is parallel to the width direction (n) of the heat exchange tube (3).

2. The microchannel heat exchanger according to claim 1, characterized in that, The microchannel heat exchanger further includes a plurality of first connecting pipes (5) and a distributor (6), and the distributor (6) has a plurality of distribution ports (61) and a delivery port (62); The first end of each first connecting pipe (5) is respectively communicated with a different liquid connector (4), the second end of each first connecting pipe (5) is respectively communicated with a different distribution port (61), and the delivery port (62) is communicated with the liquid pipeline (2).

3. The microchannel heat exchanger according to claim 1, characterized in that, The microchannel heat exchanger further includes a plurality of second connecting pipes (7); The plurality of liquid connectors (4) are connected in series through the plurality of second connecting pipes (7), and one of the plurality of liquid connectors (4) is directly communicated with the liquid pipeline (2).

4. The microchannel heat exchanger according to claim 1, characterized in that, Each liquid connector (4) is communicated with a plurality of heat exchange tubes (3), and the plurality of heat exchange tubes (3) communicated with the same liquid connector (4) are arranged along the axis (m) of the liquid connector (4).

5. The microchannel heat exchanger according to claim 1, characterized in that, The microchannel heat exchanger further includes a gas collecting pipe (8) and a fixing plate (9); The gas collecting pipe (8) is respectively communicated with the first ends of the plurality of heat exchange tubes (3) and the gaseous pipeline (1); The fixing plate (9) is located on the side of the plurality of heat exchange tubes (3) away from the gas collecting pipe (8), and the fixing plate (9) is connected to the plurality of heat exchange tubes (3).

6. The microchannel heat exchanger according to claim 5, characterized in that, The plurality of liquid connectors (4) are located between the fixing plate (9) and the gas collecting pipe (8).

7. The microchannel heat exchanger according to claim 5, characterized in that, The fixing plate (9) has a plurality of first through holes (91), the second end of each heat exchange tube (3) passes through a different first through hole (91) and extends to the side of the fixing plate (9) away from the gas collecting pipe (8), and the plurality of liquid connectors (4) are located on the side of the fixing plate (9) away from the gas collecting pipe (8).

8. The microchannel heat exchanger according to claim 5, characterized in that, The heat exchange tube (3) has a bent structure; The gas collecting pipe (8) has a plurality of second through holes (81) in the radial direction, the second end of each heat exchange tube (3) passes through a different second through hole (81) and extends to the side of the gas collecting pipe (8) away from the fixing plate (9), and the plurality of liquid connectors (4) are located on the side of the gas collecting pipe (8) away from the fixing plate (9).

9. The microchannel heat exchanger according to claim 1, characterized in that, The microchannel heat exchanger further includes a plurality of gaseous connectors (10); The first ends of the plurality of gaseous connectors (10) are all in communication with the gaseous pipeline (1), the second end of each gaseous connector (10) is in communication with the first end of at least one of the heat exchange tubes (3), the gaseous connector (10) has a tubular structure, and the axial direction of the gaseous connector (10) is parallel to the width direction (n) of the heat exchange tube (3).

10. The microchannel heat exchanger according to claim 9, characterized in that, The microchannel heat exchanger further includes a plurality of third connecting pipes (11); The plurality of gaseous connectors (10) are connected in series through the plurality of third connecting pipes (11), and one of the plurality of gaseous connectors (10) is directly in communication with the gaseous pipeline (1).

11. An air conditioning system, characterized in that, The air conditioning system includes the microchannel heat exchanger according to any one of claims 1-10.

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