Heat exchanger structure, air conditioner outdoor unit, heat pump system and air conditioner

Abstract

The invention relates to the technical field of air conditioners, in particular to a heat exchanger structure, an air conditioner outdoor unit, a heat pump system and an air conditioner, and aims to solve the problem that a refrigerant flow path in an existing heat exchanger is fixed and cannot give consideration to the performance of a refrigerating mode and a heating mode. In order to achieve the purpose, the heat exchanger structure comprises a main pipeline, a branch pipeline and an auxiliary pipeline, the branch pipeline and the auxiliary pipeline communicate with the main pipeline, and the branch pipeline comprises a main branch pipe set and an auxiliary branch pipe set; one end of the main branch pipe group is communicated with the main pipeline, and the other end of the main branch pipe group is communicated with the auxiliary branch pipe group and the auxiliary pipeline; one end of the auxiliary branch pipe group is communicated with the main pipeline, and the other end of the auxiliary branch pipe group is communicated with the main branch pipe group and the auxiliary pipeline; a first one-way valve is arranged on the main pipeline; second one-way valves are arranged between the auxiliary pipeline and the main branch pipe set and between the auxiliary pipeline and the auxiliary branch pipe set. According to the heat exchanger structure, the one-way valve is arranged, so that automatic switching of the number of flowing paths and flowing paths of a refrigerant in a refrigerating mode and a heating mode is achieved, and the refrigerating / heating efficiency of the air conditioner is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and in particular to a heat exchanger structure, an air conditioner outdoor unit, a heat pump system and an air conditioner. Background Art

[0002] As the global climate changes, extreme weather phenomena are becoming more frequent. The temperature in winter is getting lower and lower, and the temperature in summer is getting higher and higher. The high temperature in summer and the low temperature in winter put forward higher requirements on the cooling and heating capacity of the air-conditioning system. Compared with the increasingly harsh environment, the heat exchanger of the traditional central air-conditioning outdoor unit usually adopts a fixed flow path design, and its cooling and heating functions are realized only by switching the flow direction of the refrigerant. The cooling capacity of the central air-conditioning outdoor unit is insufficient when the weather is hot, and the heating capacity is relatively low when the weather is cold. The fixed flow path of the refrigerant makes it impossible for the air conditioner to dynamically adjust according to different working conditions, and it is difficult to take into account the optimal performance of the cooling and heating modes. Summary of the invention

[0003] The present invention aims to solve the above technical problem, that is, to solve the problem that the fixed flow path of the refrigerant in the existing heat exchanger cannot take into account the performance of both the cooling mode and the heating mode.

[0004] In a first aspect, the present invention provides a heat exchanger structure, comprising a main pipeline, a branch pipeline connected to the main pipeline, and an auxiliary pipeline, characterized in that the branch pipeline comprises a main branch pipeline group and a secondary branch pipeline group; one end of the main branch pipeline group is connected to the main pipeline, and the other end is connected to the secondary branch pipeline group and the auxiliary pipeline; one end of the secondary branch pipeline group is connected to the main pipeline, and the other end is connected to the main branch pipeline group and the auxiliary pipeline; a first one-way valve is arranged on the main pipeline, which is used to allow the fluid to be transmitted only from the second pipeline section connecting the main pipeline and the secondary branch pipeline group to the first pipeline section connecting the main pipeline and the main branch pipeline group; a second one-way valve is arranged between the auxiliary pipeline and the main branch pipeline group and the secondary branch pipeline group, which is used to control the transmission path of the fluid between the auxiliary pipeline and the main branch pipeline group and the secondary branch pipeline group.

[0005] Furthermore, the main branch pipe group includes multiple main branch pipe units; one end of the main branch pipe unit is connected to the first pipe section of the main pipeline, and the other end of the main branch pipe unit is connected to the first liquid distributor, and is connected to the sub-branch pipe group through the first liquid distributor.

[0006] Furthermore, the main branch pipe unit includes a plurality of branch pipes arranged in parallel; the plurality of branch pipes are connected through a transfer pipe, so that the main branch pipe unit forms a first port and a second port, the first port is connected to the first pipe section of the main line, and the second port is connected to the first liquid distributor.

[0007] Further, the auxiliary branch pipe group includes a first branch pipe group and a second branch pipe group; one end of the first branch pipe group is connected to the second pipe section of the main pipe, and the other end of the first branch pipe group is connected to the second liquid distributor, and is connected to the first liquid distributor through the second liquid distributor; the cut-off end of the second one-way valve is connected to the first liquid distributor and the second liquid distributor, and the conducting end of the second one-way valve is connected to the auxiliary pipe; one end of the second branch pipe group is connected to the second pipe section of the main pipe, and the other end of the second branch pipe group is connected to the conducting end of the second one-way valve.

[0008] Furthermore, the first branch pipe group includes multiple first branch pipe units, and the first branch pipe unit includes multiple branch pipes arranged in parallel; the multiple branch pipes are connected through a transfer tube, so that the first branch pipe unit forms a third port and a fourth port, the third port is connected to the second pipe section of the main line, and the fourth port is connected to the second liquid distributor.

[0009] Furthermore, the second branch pipe group includes a plurality of second branch pipe units, and the second branch pipe unit includes a plurality of branch pipes arranged in parallel; the plurality of branch pipes are connected through a transfer tube, so that the second branch pipe unit forms a fifth port and a sixth port, the fifth port is connected to the second pipeline section of the main pipeline, and the sixth port is connected to the connecting pipeline between the second one-way valve and the auxiliary pipeline.

[0010] Furthermore, an electronic expansion valve is provided on the auxiliary pipeline.

[0011] In a second aspect, the present invention further provides an air conditioner outdoor unit, which includes the heat exchanger structure as described above.

[0012] In a third aspect, the present invention further provides a heat pump system, which includes an outdoor heat exchanger, wherein the outdoor heat exchanger adopts the heat exchanger structure as described above.

[0013] In a fourth aspect, the present invention further provides an air conditioner, which includes the air conditioner outdoor unit as described above, or the heat pump system as described above.

[0014] In the case of adopting the above technical solution, the present invention can distribute the flow path of the refrigerant in the heat exchanger by setting a first one-way valve and a second one-way valve in the branch pipe in the heat exchanger. The automatic switching of the number of flow paths and the flow path of the refrigerant in the cooling and heating modes is realized. When cooling, the refrigerant flows through fewer flow paths and the flow path is long; when heating, the refrigerant flows through more flow paths and the flow path is short, thereby significantly improving the cooling / heating efficiency of the air conditioner in harsh environments, reducing the pressure loss and frosting risks, and having high reliability without the need for a complex control system. It solves the core contradiction that traditional heat exchangers cannot take into account both cooling and heating efficiency, adapts to the operating requirements in extreme environments, and provides a reliable solution for the high-performance operation of air-conditioning systems in harsh environments. It achieves good cooling and heating in harsh environments and improves user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 It is a schematic diagram of the piping structure of an existing heat exchanger;

[0017] Figure 2 and Figure 3 Schematic diagram of the overall structure of the heat exchanger in the embodiment of the present application;

[0018] Figure 4 It is a schematic diagram of the overall structure of the main pipeline, branch pipeline group and auxiliary pipeline of the heat exchanger structure in the embodiment of the present application;

[0019] Figure 5 A detailed structural diagram of the heat exchanger structure in the embodiment of the present application and a schematic diagram of the refrigerant flow path in the cooling mode;

[0020] Figure 6 Schematic diagram of the refrigerant flow path of the heat exchanger structure in the embodiment of the present application in the heating mode.

[0021] Reference numerals:

[0022] 10. Main pipeline; 11. First pipeline section; 12. Second pipeline section; 20. Auxiliary pipeline; 30. Main branch pipe group; 31. Main branch pipe unit; 311. First port; 312. Second port; 40. Auxiliary branch pipe group; 41. First branch pipe group; 411. First branch pipe unit; 412. Third port; 413. Fourth port; 42. Second branch pipe group; 421. Second branch pipe unit; 422. Fifth port; 423. Sixth port; 51. First one-way valve; 52. Second one-way valve; 61. First liquid distributor; 62. Second liquid distributor; 70. Branch pipe; 80. Electronic expansion valve; 90. Shell. DETAILED DESCRIPTION

[0023] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0024] First, it should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "vertical", "horizontal", "longitudinal", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0025] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] exist Figure 1 In the piping structure of the conventional heat exchanger shown in FIG. 1 , the refrigerant passes through multiple branch pipes arranged in the heat exchanger, such as Figure 1 The fifteen branch pipes shown in the figure enter the flow path of the heat exchanger for heat exchange. After the refrigerant completes the heat exchange in the multi-branch pipe, it converges to the main pipe, and then passes through the multi-branch pipe connected to the other end of the main pipe, such as Figure 1The eight-way branch pipe shown in the figure flows out of the heat exchanger. With such a pipe arrangement, the flow path and length of the refrigerant in the heat exchanger are fixed whether the air conditioner is running in cooling mode or heating mode. The only difference is the change in the flow direction of the refrigerant in the pipe of the heat exchanger, which cannot take into account the cooling and heating performances.

[0027] like Figure 2 and Figure 3 As shown, the embodiment of the present application provides a heat exchanger structure, which includes a main line 10, a branch line connected to the main line 10, and an auxiliary line 20. The fluid flows in the heat exchanger structure to achieve heat exchange. In this embodiment, the fluid mainly refers to the refrigerant in the air conditioner.

[0028] like Figure 2 and Figure 4 As shown, the branch pipeline includes a main branch pipeline group 30 and a sub-branch pipeline group 40, which are arranged in a shell 90 of the heat exchanger structure. One end of the main branch pipeline group 30 is connected to the main pipeline 10, so that the fluid can be bidirectionally transmitted between the main pipeline 10 and the main branch pipeline group 30. The other end of the main branch pipeline group 30 is connected to the sub-branch pipeline group 40 and the auxiliary pipeline 20, so that the fluid can be transmitted from the main branch pipeline group 30 to the sub-branch pipeline group 40, and from the auxiliary pipeline 20 to the main branch pipeline group 30.

[0029] like Figure 2 , Figure 3 and Figure 5 As shown, one end of the secondary branch pipe set 40 is connected to the main pipe 10, so that the fluid can be bidirectionally transmitted between the main pipe 10 and the secondary branch pipe set 40. The other end of the secondary branch pipe set 40 is connected to the main branch pipe set 30 and the auxiliary pipe 20, so that the fluid can be transmitted from the main branch pipe set 30 to the main pipe 10 via the secondary branch pipe set 40, and from the auxiliary pipe 20 to the secondary branch pipe set 40, and then transmitted to the main pipe 10 via the secondary branch pipe set 40.

[0030] In order to control the flow path of the fluid between the main line 10, the main branch line group 30 and the secondary branch line group 40, a first one-way valve 51 is provided on the main line 10. By providing the first one-way valve 51, the fluid entering the main line 10 can only be transmitted from the second pipeline section 12 connecting the main line 10 and the secondary branch line group 40 to the first pipeline section 11 connecting the main line 10 and the main branch line group 30. When the fluid enters the main line 10, it can only be transmitted to the main branch line group 30 through the first pipeline section 11 connecting the main line 10 and the main branch line group 30; and cannot flow to the second pipeline section 12 connecting the main line 10 and the secondary branch line group 40, and thus cannot be transmitted to the secondary branch line group 40.

[0031] In addition, in order to control the flow path of the fluid between the auxiliary pipeline 20, the main branch pipe group 30 and the secondary branch pipe group 40, a second one-way valve 52 is arranged between the auxiliary pipeline 20 and the main branch pipe group 30 and the secondary branch pipe group 40 to control the transmission path of the fluid between the auxiliary pipeline 20 and the main branch pipe group 30 and the secondary branch pipe group 40.

[0032] Furthermore, if Figure 5 As shown, the main branch pipe group 30 includes a plurality of main branch pipe units 31; one end of each main branch pipe unit 31 is connected to the first pipe section 11 of the main pipe 10, and the other end of each main branch pipe unit 31 is connected to the first liquid distributor 61, and is connected to the auxiliary branch pipe group 40 through the first liquid distributor 61. Each main branch pipe unit 31 includes a plurality of branch pipes 70 arranged in parallel; the plurality of branch pipes 70 are connected through a transfer pipe, so that the main branch pipe unit 31 forms a first port 311 and a second port 312, the first port 311 is connected to the first pipe section 11 of the main pipe 10, and the second port 312 is connected to the first liquid distributor 61.

[0033] In a specific embodiment, Figure 5 As shown, the main branch pipe group 30 includes six main branch pipe units 31; each main branch pipe unit 31 includes twelve branch pipes 70 arranged in parallel. Two branch pipes 70 in each main branch pipe unit 31 form a first port 311, which is connected to the first pipeline section 11 of the main pipeline 10; the other two branch pipes 70 form a second port 312, which is connected to the first liquid distributor 61 through a pipeline; the remaining eight branch pipes 70 are connected through a transfer pipe to form a pipeline for the fluid to flow in the main branch pipe unit 31. The fluid can enter the pipeline of the first branch pipeline unit from the main pipeline 10 through the first port 311 connected to the first pipeline section 11 of the main pipeline 10, and after flowing through the first branch pipeline unit, it flows out of the first branch pipeline unit from the second port 312, and is transmitted to the first liquid distributor 61 through the connecting pipeline between the second port 312 and the first liquid distributor 61. The six first branch pipe units in the main branch pipe set 30 are respectively connected to the first liquid distributor 61 through six connecting pipes. The first liquid distributor 61 collects the fluids delivered by the six main branch pipe units 31 and outputs them to the auxiliary branch pipe set 40 through one pipe.

[0034] The number of main branch pipe units 31 included in the main branch pipe group 30 and the number of branch pipes 70 included in each main branch pipe unit 31 can be set as needed, and the embodiment of the present application does not specifically limit this.

[0035] Furthermore, if Figure 2 , Figure 3 and Figure 5As shown, the auxiliary branch pipe set 40 includes a first branch pipe set 41 and a second branch pipe set 42. Among them, one end of the first branch pipe set 41 is connected to the second pipe section 12 of the main pipe 10, and the other end of the first branch pipe set 41 is connected to the second liquid distributor 62, and is connected to the first liquid distributor 61 through the second liquid distributor 62, so that the fluid of the main branch pipe set 30 can be transmitted to the first branch pipe set 41 through the first liquid distributor 61 and the second liquid distributor 62, and finally returns to the main pipe 10. The cut-off end of the second one-way valve 52 is connected to the first liquid distributor 61 and the second liquid distributor 62, and the conducting end of the second one-way valve 52 is connected to the auxiliary pipe 20.

[0036] Further, the first branch pipe group 41 includes a plurality of first branch pipe units 411, and the first branch pipe unit 411 includes a plurality of parallel branch pipes 70. The plurality of branch pipes 70 are connected through the transfer pipe, so that the first branch pipe unit 411 forms a third port 412 and a fourth port 413, the third port 412 is connected to the second pipe section 12 of the main pipe 10, and the fourth port 413 is connected to the second liquid distributor 62.

[0037] In a specific embodiment, Figure 5 As shown, the first branch pipe group 41 of the secondary branch pipe group 40 includes two first branch pipe units 411; each first branch pipe unit 411 includes twelve branch pipes 70 arranged in parallel. The two branch pipes 70 in each first branch pipe unit 411 form a third port 412, which is connected to the second pipeline section 12 of the main pipeline 10; the other two branch pipes 70 form a fourth port 413, which is connected to the second liquid distributor 62 through a pipeline; the remaining eight branch pipes 70 are connected through a transfer pipe to form a pipeline for the fluid to flow in the first branch pipe unit 411. The two first branch pipe units in the first branch pipe group 41 are connected to the second liquid distributor 62 through four connecting pipelines respectively. After the second liquid distributor 62 collects the fluids transported by the two first branch pipe units 411, it is connected to the main branch pipe group 30 through a pipeline.

[0038] By setting the first one-way valve 51 and the second one-way valve 52, the fluid can enter the first liquid distributor 61 from the first pipeline section 11 of the main pipeline 10 through the main branch pipeline group 30, and then be transferred to the second liquid distributor 62 after being merged by the first liquid distributor 61, and then be transferred to the first branch pipeline group 41 of the secondary branch pipeline group 40 after being diverted by the second liquid distributor 62, and finally return to the second pipeline section 12 of the main pipeline 10.

[0039] By setting the second one-way valve 52, on the one hand, after the fluid is transmitted from the main branch pipe group 30 to the first liquid distributor 61, it cannot be transmitted to the auxiliary pipeline 20 through the second one-way valve 52, but can only be transmitted to the second liquid distributor 62 and flow to the first branch pipe group 41 of the secondary branch pipe group 40; on the other hand, the fluid can only flow from the auxiliary pipeline 20 through the second one-way valve 52 and be transmitted to the main branch pipe group 30 and the first branch pipe group 41 of the secondary branch pipe group 40 through the first liquid distributor 61 and the second liquid distributor 62.

[0040] One end of the second branch pipe group 42 is connected to the second pipeline section 12 of the main pipeline 10, and the other end of the second branch pipe group 42 is connected to the conduction end of the second one-way valve 52. Further, the second branch pipe group 42 includes a plurality of second branch pipe units 421, and the second branch pipe unit 421 includes a plurality of branch pipes 70 arranged in parallel. The plurality of branch pipes 70 are connected through the transfer pipe, so that the second branch pipe unit 421 forms a fifth port 422 and a sixth port 423, the fifth port 422 is connected to the second pipeline section 12 of the main pipeline 10, and the sixth port 423 is connected to the connecting pipeline between the second one-way valve 52 and the auxiliary pipeline 20.

[0041] By setting the first one-way valve 51 and the second one-way valve 52, the fluid enters the second pipeline section 12 of the main pipeline 10 from the first pipeline section 11 of the main pipeline 10 through the main branch pipeline group 30 and the first branch pipeline group 41 of the auxiliary branch pipeline group 40, enters the second branch pipeline group 42 of the auxiliary branch pipeline group 40 through the fifth port 422, and flows out of the second branch pipeline group 42 from the sixth port 423, and then flows out of the heat exchanger from the auxiliary pipeline 20 under the restriction of the second one-way valve 52.

[0042] In a specific embodiment, as shown in FIG. X, the second branch pipe group 42 of the auxiliary branch pipe group 40 includes two second branch pipe units 421; each second branch pipe unit 421 includes twelve branch pipes 70 arranged in parallel. The two branch pipes 70 in each second branch pipe unit 421 form a fifth port 422, which is connected to the second pipeline section 12 of the main pipeline 10; the other two branch pipes 70 form a sixth port 423, which is connected to the connecting pipeline between the second one-way valve 52 and the auxiliary pipeline 20 through the pipeline; the remaining eight branch pipes 70 are connected through a transfer pipe to form a pipeline for fluid to flow in the second branch pipe unit 421. The two second branch pipe units in the second branch pipe group 42 are connected to the connecting pipeline between the second one-way valve 52 and the auxiliary pipeline 20 through two connecting pipelines. A tee can be set to connect the two connecting pipelines to the connecting pipeline between the second one-way valve 52 and the auxiliary pipeline 20.

[0043] The number of first branch pipe units 411 included in the first branch pipe group 41 in the secondary branch pipe group 40 and the number of branch pipes 70 included in each first branch pipe unit 411, as well as the number of second branch pipe units 421 included in the second branch pipe group 42 and the number of branch pipes 70 included in each second branch pipe unit 421 can be set as needed, and the embodiments of the present application do not make specific limitations on this.

[0044] When the air conditioner is cooling, it is hoped that the number of paths for the refrigerant to enter the heat exchanger is as few as possible and the flow path is as long as possible. This will enable the refrigerant to fully exchange heat with the outdoor environment when flowing through the heat exchanger located in the outdoor unit, thereby reducing the temperature of the refrigerant and achieving a better cooling effect when the refrigerant enters the indoor unit.

[0045] When the heat exchanger structure in the embodiment of the present application is used for refrigeration operation, Figure 5 As shown, the high-temperature and high-pressure gaseous refrigerant output from the compressor enters the heat exchanger from the main pipe 10 of the heat exchanger, flows through the branch pipe 70 in the heat exchanger for heat exchange (heat release), and then leaves the heat exchanger from the auxiliary pipe 20.

[0046] After the gaseous refrigerant enters the main line 10, it enters each main branch pipe unit 31 through the first port 311 of each main branch pipe unit 31 in the main branch pipe group 30 connected to the first pipe section 11 of the main line 10. The first one-way valve 51 is in a closed state due to the pressure of the refrigerant. The refrigerant undergoes latent heat exchange in the process of flowing through the pipeline of the main branch pipe unit 31, and is transformed from a high-temperature and high-pressure gaseous refrigerant to a low-temperature and high-pressure liquid refrigerant, and flows out from the second port 312 of the main branch pipe unit 31, and then is transmitted to the first liquid distributor 61 through the connecting pipeline. The flow path direction of the refrigerant in the above pipeline is as follows: Figure 5 Indicated by the red line and arrow.

[0047] The first liquid distributor 61 collects the refrigerants of multiple main branch units and transmits them to the second liquid distributor 62 through a connecting pipe. The second liquid distributor 62 then transmits them to the fourth port 413 of each first branch pipe unit 411 in the first branch pipe group 41 of the secondary branch pipe group 40, and enters the pipeline of the first branch pipe unit 411. The second one-way valve 52 is in a closed state due to the pressure of the refrigerant. The refrigerant undergoes sensible heat exchange in the process of flowing through the pipeline of the first branch pipe unit 411, and the temperature further drops. Then the refrigerant flows out from the third port 412 of the first branch pipe unit 411 and enters the second pipeline section 12 of the main pipeline 10. The flow path direction of the refrigerant in the above pipeline is as follows: Figure 5 Indicated by the blue line and arrow.

[0048] Then, the refrigerant enters the pipeline of the second branch pipe unit 421 from the fifth port 422 of the second branch pipe unit 421 in the second branch pipe group 42 of the auxiliary branch pipe group 40 for further heat exchange. Finally, the refrigerant flows out from the sixth port 423 of the second branch pipe unit 421 and is transmitted to the auxiliary pipeline 20 to leave the heat exchanger. The flow path direction of the refrigerant in the above pipeline is as follows: Figure 5 Indicated by the purple line and arrow.

[0049] The heat exchanger structure in the embodiment of the present application, under the premise of setting the number of branch pipes 70 therein to be fixed, divides the branch pipes 70 into three groups by setting the first one-way valve 51 and the second one-way valve 52: the main branch pipe group 30, the first branch pipe group 41 of the auxiliary branch pipe group 40 and the second branch pipe group 42, providing a long-flow pipeline for the refrigerant. Although this setting reduces the number of branch pipes through which the refrigerant flows at the same time, it prolongs the flow of the refrigerant. The refrigerant first flows through the main branch pipe group 30, then the first branch pipe group 41 of the auxiliary branch pipe group 40, and finally the second branch pipe group 42 of the auxiliary branch pipe group 40. The long-flow design prolongs the time that the refrigerant stays in the heat exchanger, so that the refrigerant can fully exchange heat with the environment and improve the supercooling. In a high temperature environment, the setting of a small number of pipes and a long flow enables the refrigerant to fully release heat, the supercooling increases by 5-8°C, and the cooling capacity increases by more than 15%.

[0050] When the air conditioner is heating, it is hoped that the refrigerant enters the heat exchanger in as many ways as possible and the flow path is as short as possible, so that the refrigerant can evaporate and exchange heat in a short time when flowing through the heat exchanger in the outdoor unit, reducing heat loss, reducing pressure loss, and reducing the possibility of frost on the heat exchanger. This will improve the overall performance of the central air conditioner outdoor unit.

[0051] When the heat exchanger structure in the embodiment of the present application is used for heating operation, Figure 6 As shown, combined with Figure 5 The low-temperature and low-pressure liquid refrigerant enters the heat exchanger from the auxiliary pipeline 20 of the heat exchanger, flows through the branch pipe 70 in the heat exchanger for heat exchange (heat absorption), and then leaves the heat exchanger from the main pipeline 10.

[0052] After the refrigerant enters the auxiliary pipeline 20, it passes through the connecting pipeline connecting the auxiliary pipeline 20 and the conducting end of the second one-way valve 52, and passes through the second one-way valve 52 to be transmitted to the first liquid distributor 61 and the second liquid distributor 62. The refrigerant transmitted to the first liquid distributor 61 flows into each main branch pipe unit 31 in the main branch pipe group 30 after being divided, and finally enters the first pipe section 11 of the main pipe 10; the flow path direction of the refrigerant in this section of the pipeline is as follows: Figure 6The refrigerant transmitted to the second liquid distributor 62 flows into each first branch pipe unit 411 in the first branch pipe group 41 of the secondary branch pipe group 40 after being divided, and then enters the second pipe section 12 of the main pipe 10, and passes through the first check valve 51 to flow to the first pipe section 11 of the main pipe 10; the flow path direction of the refrigerant in this pipe section is as shown in FIG. Figure 6 In addition, the refrigerant is also transmitted to each second branch pipe unit 421 in the second branch pipe group 42 of the auxiliary branch pipe group 40 through the connecting pipe between the auxiliary pipe 20 and the conducting end of the second one-way valve 52, and then enters the second pipe section 12 of the main pipe 10, and passes through the first one-way valve 51 to flow to the first pipe section 11 of the main pipe 10; the flow path direction of the refrigerant in this pipe section is as shown in FIG. Figure 6 As shown by the purple line and arrow in the figure.

[0053] In the heat exchanger structure of the embodiment of the present application, when the air conditioner is heating, the first one-way valve 51 and the second one-way valve 52 are both in the open state, so that the refrigerant can flow into all the branch pipes 70 arranged in the heat exchanger after entering the heat exchanger, forming a multi-flow path and a short flow path; reducing the pressure drop of the refrigerant and accelerating evaporation. When operating at low temperature, the multi-flow path diversion can reduce the pressure loss of the refrigerant by 30%-40%, increase the evaporation temperature by 2-3℃, and enhance the heating capacity by 20%.

[0054] Furthermore, an electronic expansion valve 80 is also provided on the auxiliary pipeline 20. When the air conditioner is in cooling mode, the electronic expansion valve 80 does not work. When the air conditioner is in heating mode, the electronic expansion valve 80 is activated to prevent frost on the heat exchanger.

[0055] The heat exchanger structure in the embodiment of the present application distributes the flow path of the refrigerant in the heat exchanger by setting a first one-way valve 51 and a second one-way valve 52 in the branch pipe 70 in the heat exchanger. Automatic switching of the number of flow paths and the flow path of the refrigerant in the cooling and heating modes is realized. When cooling, the refrigerant flows through fewer flow paths and longer flow paths; when heating, the refrigerant flows through more flow paths and shorter flow paths, thereby significantly improving the cooling / heating efficiency of the air conditioner in harsh environments, reducing the risk of pressure loss and frosting, and having high reliability without the need for a complex control system. It solves the core contradiction that traditional heat exchangers cannot take into account both cooling and heating efficiency, adapts to the operating requirements in extreme environments, and provides a reliable solution for the high-performance operation of air-conditioning systems in harsh environments. It achieves good cooling and heating in harsh environments and improves user experience.

[0056] The heat exchanger structure in the embodiment of the present application can be widely used in household multi-split units, commercial central air conditioners and heat pump systems, especially in areas with large temperature differences between day and night or extreme climates all year round. According to tests, in a high temperature environment of 46°C, the cooling capacity is increased by 18% compared with traditional models; when heating at a low temperature of -15°C, the energy efficiency ratio (COP) is increased by 25%, and the defrosting frequency is reduced by 50%.

[0057] An embodiment of the present application further provides an air conditioner outdoor unit, which includes the heat exchanger structure as described above.

[0058] An embodiment of the present application further provides a heat pump system, which includes an outdoor heat exchanger, and the outdoor heat exchanger adopts the heat exchanger structure as described above.

[0059] An embodiment of the present application further provides an air conditioner, which includes the air conditioner outdoor unit as described above, or the heat pump system as described above.

[0060] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A heat exchanger structure, comprising a main pipeline (10), a branch pipeline connected to the main pipeline (10), and an auxiliary pipeline (20), characterized in that: The branch pipeline comprises a main branch pipeline group (30) and a secondary branch pipeline group (40); One end of the main branch pipe group (30) is connected to the main pipe (10), and the other end is connected to the secondary branch pipe group (40) and the auxiliary pipe (20); One end of the secondary branch pipe group (40) is connected to the main pipe (10), and the other end is connected to the main branch pipe group (30) and the auxiliary pipe (20); The main pipeline (10) is provided with a first one-way valve (51) for allowing fluid to be transmitted only from the second pipeline section (12) connecting the main pipeline (10) and the secondary branch pipeline group (40) to the first pipeline section (11) connecting the main pipeline (10) and the main branch pipeline group (30); A second one-way valve (52) is provided between the auxiliary pipeline (20) and the main branch pipeline group (30) and the auxiliary branch pipeline group (40) for controlling the transmission path of the fluid between the auxiliary pipeline (20) and the main branch pipeline group (30) and the auxiliary branch pipeline group (40).

2. The heat exchanger structure according to claim 1, characterized in that: The main branch pipe group (30) comprises a plurality of main branch pipe units (31); One end of the main branch pipe unit (31) is connected to the first pipe section (11) of the main pipe (10), and the other end of the main branch pipe unit (31) is connected to the first liquid distributor (61), and is connected to the auxiliary branch pipe group (40) through the first liquid distributor (61).

3. The heat exchanger structure according to claim 2, characterized in that: The main branch pipe unit (31) comprises a plurality of branch pipes (70) arranged in parallel; The plurality of branch pipes (70) are connected via a transfer pipe, so that the main branch pipe unit (31) forms a first port (311) and a second port (312), wherein the first port (311) is connected to the first pipe section (11) of the main pipe (10), and the second port (312) is connected to the first liquid distributor (61).

4. The heat exchanger structure according to claim 3, characterized in that: The secondary branch pipe group (40) comprises a first branch pipe group (41) and a second branch pipe group (42); One end of the first branch pipe group (41) is connected to the second pipe section (12) of the main pipe (10), and the other end of the first branch pipe group (41) is connected to the second liquid distributor (62), and is connected to the first liquid distributor (61) through the second liquid distributor (62); The cut-off end of the second one-way valve (52) is connected to the first liquid distributor (61) and the second liquid distributor (62), and the conduction end of the second one-way valve (52) is connected to the auxiliary pipeline (20); One end of the second branch pipe group (42) is connected to the second pipe section (12) of the main pipe (10), and the other end of the second branch pipe group (42) is connected to the conducting end of the second one-way valve (52).

5. The heat exchanger structure according to claim 4, characterized in that: The first branch pipe group (41) comprises a plurality of first branch pipe units (411), and the first branch pipe unit (411) comprises a plurality of branch pipes (70) arranged in parallel; The plurality of branch pipes (70) are connected via a transfer pipe, so that the first branch pipe unit (411) forms a third port (412) and a fourth port (413), the third port (412) being connected to the second pipe section (12) of the main pipe (10), and the fourth port (413) being connected to the second liquid distributor (62).

6. The heat exchanger structure according to claim 5, characterized in that: The second branch pipe group (42) comprises a plurality of second branch pipe units (421), and the second branch pipe unit (421) comprises a plurality of branch pipes (70) arranged in parallel; The plurality of branch pipes (70) are connected via a transfer pipe, so that the second branch pipe unit (421) forms a fifth port (422) and a sixth port (423), the fifth port (422) being connected to the second pipeline section (12) of the main pipeline (10), and the sixth port (423) being connected to the connecting pipeline between the second one-way valve (52) and the auxiliary pipeline (20).

7. The heat exchanger structure according to any one of claims 1 to 6, characterized in that: An electronic expansion valve (80) is provided on the auxiliary pipeline (20).

8. An outdoor unit of an air conditioner, characterized in that: The heat exchanger comprises the heat exchanger structure according to any one of claims 1 to 7.

9. A heat pump system, comprising an outdoor heat exchanger, characterized in that: The outdoor heat exchanger adopts the heat exchanger structure according to any one of claims 1 to 7.

10. An air conditioner, characterized in that: It includes the air-conditioning outdoor unit as claimed in claim 8, or the heat pump system as claimed in claim 9.

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