Air conditioning system

Abstract

The utility model discloses an air conditioning system, which belongs to the technical field of air conditioners and comprises an outdoor heat exchanger, a compressor, a convection tail end, a radiation tail end, an electric ball valve and a second expansion valve, the outdoor heat exchanger is used for exchanging heat with outdoor air; the compressor is used for driving a refrigerant to flow; the heat exchanger communicates with the outdoor heat exchanger; the first expansion valve is used for throttling a refrigerant passing through the first expansion valve; the convection tail end is used for performing convection heat exchange with indoor air; the convection terminal comprises an indoor heat exchanger, and the indoor heat exchanger, the compressor, the outdoor heat exchanger and the first expansion valve form a first refrigerant circulation loop through a pipeline. The radiation tail end is used for performing radiation heat transfer with indoor air; the radiation tail end and the convection tail end are arranged in parallel; the radiation tail end, the compressor, the outdoor heat exchanger and the first expansion valve form a second refrigerant circulation loop through a pipeline; the electric ball valve is arranged in the second refrigerant circulation loop, located between the radiation tail end and the compressor and used for adjusting the flow of the refrigerant flowing from the radiation tail end to the compressor. The second expansion valve is arranged in the second refrigerant circulation loop, located between the outdoor heat exchanger and the radiation tail end and used for throttling the refrigerant passing through the second expansion valve.

Description

Technical Field

[0001] The present application belongs to the technical field of air conditioning, and in particular, relates to an air conditioning system. Background Art

[0002] With the improvement of people's living standards, traditional air conditioners using convection heat exchange can no longer meet people's needs. More and more air conditioning systems use a combination of radiation heat exchange and convection heat exchange, such as waterless radiation multi-split air conditioners, natural fluorine and ground fluorine multi-split air conditioners, etc. These air conditioning systems include both convection terminals and radiation terminals, among which the convection terminals usually include duct units, air conditioner indoor units, etc., and the radiation terminals usually include capillaries arranged on the ground or wall, and the refrigerant flowing in the capillary tube exchanges heat with the indoor air in the form of radiation.

[0003] The temperature of the refrigerant at the same temperature after radiation heat exchange is different from the temperature after convection heat exchange. Therefore, the radiation end and the convection end cannot operate at the same time. However, if the radiation end is closed and only the convection end is used for heating, the refrigerant is likely to migrate at the radiation end, causing less and less refrigerant to participate in the heating cycle of the air-conditioning system, resulting in instability of the air-conditioning system.

[0004] In the prior art, some air conditioning systems set a solenoid valve at the inlet of the radiation terminal and an electronic expansion valve at the outlet of the radiation terminal, and control whether the refrigerant flows through the radiation terminal by opening and closing the solenoid valve and the electronic expansion valve. When the radiation terminal is not in use, the solenoid valve and the electronic expansion valve are closed to avoid the migration problem of the refrigerant; when the radiation terminal is in use, the solenoid valve and the electronic expansion valve are opened to allow the refrigerant to flow through the radiation terminal and perform radiation heat exchange. These air conditioning systems can also use the electronic expansion valve to adjust the refrigerant flow.

[0005] Although the stable operation of the air-conditioning system can be achieved by setting a solenoid valve at the inlet of the radiation end and an electronic expansion valve at the outlet of the radiation end, since the solenoid valve relies on spring force to complete the pipeline sealing, when the reverse pressure of the air-conditioning system is large, the problem of refrigerant reverse leakage is prone to occur, reducing the reliability of the air-conditioning system; and, since the refrigerant enters the radiation end to release heat and then passes through the electronic expansion valve, the action of the electronic expansion valve depends on the temperature characteristics of the radiation end, and the thermal inertia of radiation heat exchange is large. Therefore, the method of using an electronic expansion valve to adjust the refrigerant flow rate is likely to make the adjustment response speed of the air-conditioning system slow.

[0006] In view of this, this application is filed. Utility Model Content

[0007] In response to the deficiencies in the related art, the present application provides an air-conditioning system, which performs secondary throttling on the refrigerant flowing into the radiation terminal when the air-conditioning system is cooling, so that the temperature of the refrigerant flowing out of the radiation terminal is the same as the temperature of the refrigerant flowing out of the convection terminal, so that the air-conditioning system can simultaneously open the radiation terminal and the convection terminal for cooling.

[0008] The present application provides an air conditioning system, comprising:

[0009] An outdoor heat exchanger, used for exchanging heat with outdoor air;

[0010] A compressor is used to drive the refrigerant to flow; it is connected to the outdoor heat exchanger;

[0011] a first expansion valve, for throttling the refrigerant passing therethrough;

[0012] The convection end is used for convection heat exchange with indoor air; the convection end includes an indoor heat exchanger, and the indoor heat exchanger, a compressor, an outdoor heat exchanger and a first expansion valve form a first refrigerant circulation loop through a pipeline;

[0013] The radiation terminal is used for radiating heat transfer with indoor air; the radiation terminal is arranged in parallel with the convection terminal; the radiation terminal, the compressor, the outdoor heat exchanger and the first expansion valve form a second refrigerant circulation loop through the pipeline;

[0014] An electric ball valve is provided in the second refrigerant circulation loop and between the radiation end and the compressor, and is used to adjust the refrigerant flow from the radiation end to the compressor;

[0015] A second expansion valve is provided in the second refrigerant circulation loop and is located between the outdoor heat exchanger and the radiation terminal, and is used to throttle the refrigerant passing therethrough;

[0016] The compressor drives the refrigerant to flow through the outdoor heat exchanger and the first expansion valve in sequence. A portion of the refrigerant flows back to the compressor after flowing through the indoor heat exchanger, and the other portion of the refrigerant flows back to the compressor after passing through the radiation terminal and the electric ball valve in sequence after secondary throttling by the second expansion valve.

[0017] The compressor drives a part of the refrigerant to flow through the indoor heat exchanger and then flow into the outdoor heat exchanger; the compressor drives another part of the refrigerant to flow through the electric ball valve, the radiation terminal, and the second expansion valve in sequence and then flow into the outdoor heat exchanger; among them, the refrigerant flowing into the outdoor heat exchanger flows back to the compressor after passing through the first expansion valve.

[0018] The technical solution is to set an electric ball valve in the second refrigerant circulation loop so that the electric ball valve can adjust the flow of the refrigerant flowing into the radiation terminal when the air-conditioning system is heating, so as to ensure the heat exchange effect between the refrigerant and the indoor air in the radiation terminal; and to set a second expansion valve in the second refrigerant circulation loop so that the second expansion valve can perform secondary throttling on the refrigerant flowing into the radiation terminal from the outdoor heat exchanger when the air-conditioning system is cooling, so that the refrigerant flowing into the radiation terminal is reduced to an intermediate temperature, so that the refrigerant flowing out of the radiation terminal has the same temperature as the refrigerant flowing out of the convection terminal, thereby diverting the refrigerant, so that a part of the refrigerant flows in the first refrigerant circulation loop and the other part of the refrigerant flows in the second refrigerant circulation loop, so that the radiation terminal and the convection terminal can be cooled.

[0019] In addition, the present application also provides an air conditioning system, comprising:

[0020] An outdoor heat exchanger, used for exchanging heat with outdoor air;

[0021] A compressor is used to drive the refrigerant to flow; it is connected to the outdoor heat exchanger;

[0022] a first expansion valve, for throttling the refrigerant passing therethrough;

[0023] The convection end is used for convection heat exchange with indoor air; the convection end includes an indoor heat exchanger, and the indoor heat exchanger, a compressor, an outdoor heat exchanger and a first expansion valve form a first refrigerant circulation loop through a pipeline;

[0024] The radiation terminal is used for radiating heat transfer with indoor air; the radiation terminal is arranged in parallel with the convection terminal; the radiation terminal, the compressor, the outdoor heat exchanger and the first expansion valve form a second refrigerant circulation loop through the pipeline;

[0025] An electric ball valve is provided in the second refrigerant circulation loop and between the radiation end and the compressor, and is used to adjust the refrigerant flow from the radiation end to the compressor;

[0026] A first one-way valve is provided in the second refrigerant circulation loop and between the outdoor heat exchanger and the radiation terminal, and is used to prevent the refrigerant from flowing from the outdoor heat exchanger into the radiation terminal;

[0027] The compressor drives the refrigerant to flow in the first refrigerant circulation loop;

[0028] The compressor drives a part of the refrigerant to flow through the indoor heat exchanger and then flow into the outdoor heat exchanger; the compressor drives another part of the refrigerant to flow through the electric ball valve, the radiation terminal, and the first one-way valve in sequence and then flow into the outdoor heat exchanger; among them, the refrigerant flowing into the outdoor heat exchanger flows back to the compressor after passing through the first expansion valve.

[0029] The technical solution is to set an electric ball valve in the second refrigerant circulation loop so that the electric ball valve can adjust the flow of refrigerant flowing into the radiation terminal when the air-conditioning system is heating, so as to ensure the heat exchange effect between the refrigerant and the indoor air in the radiation terminal; and to set a first one-way valve in the second refrigerant circulation loop so that the first one-way valve prevents the refrigerant from flowing into the radiation terminal when the air-conditioning system is cooling, so that the refrigerant flows along the first refrigerant circulation loop to ensure the normal operation of the air-conditioning system, and can divert the refrigerant when the air-conditioning system is heating, so that part of the refrigerant flows in the first refrigerant circulation loop and the other part of the refrigerant flows in the second refrigerant circulation loop, so that the radiation terminal and the convection terminal can be heated.

[0030] In some of the embodiments, the indoor heat exchanger is connected to a first pipeline and a second pipeline, the first pipeline is connected to the compressor, and the second pipeline is connected to the outdoor heat exchanger; the radiation end is connected to a third pipeline and a fourth pipeline, the third pipeline is connected to the compressor, and the fourth pipeline is connected to the outdoor heat exchanger; the electric ball valve is arranged in the third pipeline, and the second expansion valve or the first check valve is arranged in the fourth pipeline.

[0031] In some embodiments, it also includes a first main circuit, the first main circuit is connected to the compressor, the first pipeline and the third pipeline are connected in parallel to the end of the first main circuit away from the compressor; the first main circuit is provided with a first stop valve.

[0032] In some of the embodiments, a four-way valve is further included, which includes a first valve port, a second valve port, a third valve port and a fourth valve port. The first valve port is connected to a fifth pipeline, which is connected to the refrigerant outlet of the compressor; the second valve port is connected to a sixth pipeline, which is connected to the refrigerant inlet of the compressor; the third valve port is connected to a seventh pipeline, which is connected to the outdoor heat exchanger; and the fourth valve port is connected to the first main circuit.

[0033] In some embodiments, an oil separator is further included, and the oil separator is connected to an eighth pipeline. One end of the eighth pipeline is connected to the sixth pipeline, and the other end of the eighth pipeline is connected to the first valve port.

[0034] In some embodiments, a second main circuit is further included, the second main circuit is connected to the outdoor heat exchanger, the second pipeline and the fourth pipeline are connected in parallel to the end of the second main circuit away from the outdoor heat exchanger; and the second main circuit is provided with a second stop valve.

[0035] In some embodiments, the first expansion valve is disposed in the second main circuit, and the first expansion valve is disposed between the second stop valve and the outdoor heat exchanger.

[0036] In some embodiments, the second main circuit is further provided with an economizer, which is arranged between the second stop valve and the outdoor heat exchanger; the economizer is connected to an air supply pipeline, one end of which is connected to the second pipeline, and the other end of which is connected to the compressor.

[0037] In some of the embodiments, a plurality of radiation terminals are provided, and the plurality of radiation terminals are arranged in parallel with each other; a plurality of convection terminals are provided, and the plurality of convection terminals are arranged in parallel with each other.

[0038] In the above embodiment, an air-conditioning system is provided with an electric ball valve in the second refrigerant circulation loop so that the electric ball valve adjusts the flow of the refrigerant flowing into the radiation terminal when the air-conditioning system is heating, so as to ensure the heat exchange effect between the refrigerant and the indoor air in the radiation terminal; and a second expansion valve is provided in the second refrigerant circulation loop so that the second expansion valve performs secondary throttling on the refrigerant flowing into the radiation terminal from the outdoor heat exchanger when the air-conditioning system is cooling, so that the refrigerant flowing into the radiation terminal is reduced to an intermediate temperature, so that the refrigerant flowing out of the radiation terminal has the same temperature as the refrigerant flowing out of the convection terminal, so that the refrigerant can be diverted, so that a part of the refrigerant flows in the first refrigerant circulation loop and the other part of the refrigerant flows in the second refrigerant circulation loop, so that the radiation terminal and the convection terminal can be cooled.

[0039] The air conditioning system can open the radiation terminal and the convection terminal at the same time for cooling or heating, with good cooling or heating effects and high operating stability and reliability of the air conditioning system. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 shows a schematic diagram of an air conditioning system according to some embodiments;

[0041] Figure 2 shows a schematic diagram of an outdoor unit in an air conditioning system according to some embodiments;

[0042] Figure 3 The flow path of the refrigerant when the air conditioning system is heating according to some embodiments is shown;

[0043] Figure 4 The flow path of the refrigerant when the air conditioning system performs cooling according to some embodiments is shown;

[0044] Figure 5 A schematic diagram of an air conditioning system configured with an air supply pipeline according to some embodiments is shown;

[0045] Figure 6 A schematic diagram of an outdoor unit after an air-supplementing pipeline is configured in an air-conditioning system according to some embodiments is shown;

[0046] Figure 7 The flow path of the refrigerant when the air conditioning system is configured with an air supply pipeline and performs heating according to some embodiments is shown;

[0047] Figure 8 The flow path of the refrigerant when the air conditioning system is configured with an air supply pipeline and performs cooling according to some embodiments is shown;

[0048] Fig. 9 A schematic diagram of an air conditioning system configured with an air supply line and an oil separator according to other embodiments is shown;

[0049] Fig.10 A schematic diagram of an outdoor unit after an air conditioning system is configured with an air supply line and an oil separator according to some embodiments;

[0050] Fig.11 The flow path of the refrigerant when the air conditioning system is configured with an air supply pipeline and an oil separator for heating according to some embodiments is shown;

[0051] Fig.12 The flow path of the refrigerant when the air conditioning system is configured with an air supply line and an oil separator for cooling according to some embodiments is shown.

[0052] Fig.13 A schematic diagram of an air conditioning system configured with an air supply line and an oil separator according to other embodiments is shown;

[0053] Fig.14 The flow path of the refrigerant when the air conditioning system is equipped with an air supply pipeline and an oil separator according to other embodiments and performs heating;

[0054] Fig.15 The flow path of the refrigerant when the air conditioning system is configured with an air supply pipeline and an oil separator according to other embodiments for cooling is shown.

[0055] In the figure,

[0056] 100, outdoor unit; 200, convection terminal; 300, radiation terminal; 400, first main circuit; 500, second main circuit; 600, economizer;

[0057] 101, a first expansion valve; 102, a second one-way valve;

[0058] 110, outdoor heat exchanger; 120, compressor; 130, high-pressure liquid storage tank; 140, four-way valve; 150, outdoor fan; 160, gas-liquid separator; 170, oil separator;

[0059] 111, seventh pipeline; 121, fifth pipeline; 122, sixth pipeline; 171, oil capillary; 172, bypass solenoid valve; 173, eighth pipeline; 174, first branch; 175, second branch;

[0060] 201, fourth expansion valve; 210, first pipeline; 220, second pipeline; 230, indoor fan;

[0061] 301, first one-way valve; 302, electric ball valve; 303, second expansion valve; 310, third pipeline; 320, fourth pipeline;

[0062] 401, first stop valve;

[0063] 501, second stop valve; 502, third branch;

[0064] 601. The third expansion valve; 610. The air supply pipeline. DETAILED DESCRIPTION

[0065] In order to make the purpose and implementation method of the present application clearer, the exemplary implementation method of the present application will be clearly and completely described below in conjunction with the drawings in the exemplary embodiments of the present application. Obviously, the described exemplary embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0066] It should be noted that the brief description of terms in this application is only for the convenience of understanding the embodiments described below, and is not intended to limit the embodiments of this application. Unless otherwise specified, these terms should be understood according to their common and usual meanings.

[0067] The terms "first", "second", "third", etc. in the specification and claims of this application and the above drawings are used to distinguish similar or similar objects or entities, and do not necessarily mean to limit a specific order or sequence, unless otherwise noted. It should be understood that the terms used in this way can be interchangeable under appropriate circumstances.

[0068] The terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover but not exclude inclusion, for example, a product or device comprising a list of components is not necessarily limited to all the components expressly listed but may include other components not expressly listed or inherent to such product or device.

[0069] The air conditioning system provided in the embodiments of the present application may have various implementation forms. For the convenience of description, the air conditioning system performing heating means that the air conditioning system heats the indoor environment, and the air conditioning system performing cooling means that the air conditioning system cools the indoor environment.

[0070] Figure 1-Figure 15 This is a specific implementation of the air conditioning system of the present application. The air conditioning system includes an outdoor unit 100 and an indoor unit. The outdoor unit 100 is arranged outdoors, and the indoor unit is arranged indoors. The outdoor unit 100 and the indoor unit cooperate with each other to cool or heat the indoor environment.

[0071] like Figure 1 , Figure 2 , Figure 5 , Figure 6 , Fig. 9 , Fig.10 and Fig.13As shown, the outdoor unit 100 includes an outdoor heat exchanger 110, which is used to exchange heat with outdoor air; a refrigerant for exchanging heat with air flows inside the outdoor heat exchanger 110; when the air-conditioning system is cooling, the outdoor heat exchanger 110 works as a condenser; when the air-conditioning system is heating, the outdoor heat exchanger 110 works as an evaporator.

[0072] In some embodiments, the outdoor unit 100 may include an outdoor fan 150 , which is disposed close to the outdoor heat exchanger 110 . The outdoor fan 150 is used to provide power for the flow of air and increase the heat exchange efficiency between the outdoor air and the outdoor heat exchanger 110 .

[0073] The outdoor heat exchanger 110 includes a first interface. When the outdoor heat exchanger 110 works as a condenser, the refrigerant flows into the outdoor heat exchanger 110 through the first interface; when the outdoor heat exchanger 110 works as an evaporator, the refrigerant flows out of the outdoor heat exchanger 110 through the first interface.

[0074] The outdoor heat exchanger 110 includes a second interface. When the outdoor heat exchanger 110 works as a condenser, the refrigerant flows out of the outdoor heat exchanger 110 through the second interface; when the outdoor heat exchanger 110 works as an evaporator, the refrigerant flows into the outdoor heat exchanger 110 through the second interface.

[0075] The first interface is connected to the seventh pipeline 111, and the outdoor heat exchanger 110 is connected to the compressor 120 through the seventh pipeline 111; the second interface is connected to the second main path 500, and the outdoor heat exchanger 110 is connected to the indoor unit through the second main path 500.

[0076] The second main circuit 500 is provided with a second stop valve 501 . The second stop valve 501 is provided to control the on-off of the second main circuit 500 , thereby controlling whether the refrigerant flows from the indoor unit to the outdoor heat exchanger 110 .

[0077] The second main circuit 500 is provided with a first expansion valve 101, which is provided between the second stop valve 501 and the outdoor heat exchanger 110. The first expansion valve 101 is used to throttle the refrigerant passing through it. The refrigerant in a high-pressure state is converted into a low-pressure refrigerant after throttling through the first expansion valve 101.

[0078] The second main circuit 500 is connected to a high-pressure liquid reservoir 130 , which is located between the second stop valve 501 and the first expansion valve 101 . The high-pressure liquid reservoir 130 is used to store high-pressure liquid from the condenser to ensure that the condenser can fully release heat.

[0079] The outdoor unit 100 includes a compressor 120, which is used to compress the refrigerant gas in a low-temperature and low-pressure state into a refrigerant gas in a high-temperature and high-pressure state. The compressor 120 provides power for the circulation of the refrigerant in the pipeline.

[0080] The compressor 120 includes a refrigerant inlet, and the refrigerant in a low-temperature and low-pressure state enters the compressor 120 through the refrigerant inlet.

[0081] The compressor 120 includes a refrigerant outlet, and the refrigerant in a low-temperature and low-pressure state is compressed into a refrigerant in a high-temperature and high-pressure state and then output from the compressor 120 through the refrigerant outlet.

[0082] When the air conditioning system is in heating mode, the refrigerant compressed by the compressor 120 flows into the indoor unit, exchanges heat with the indoor air, flows into the outdoor heat exchanger 110 to exchange heat with the outdoor air, and then flows back to the compressor 120. The refrigerant circulates among the compressor 120, the indoor unit, the outdoor heat exchanger 110, and the compressor 120.

[0083] When the air conditioning system is in cooling mode, the refrigerant compressed by the compressor 120 flows into the outdoor heat exchanger 110 to exchange heat with the outdoor air, then flows into the indoor unit to exchange heat with the indoor air, and then flows back to the compressor 120. The refrigerant circulates among the compressor 120, the outdoor heat exchanger 110, the indoor unit, and the compressor 120.

[0084] Since the refrigerant flow paths are different when the air conditioning system is cooling and heating, in order to ensure the reliability of the refrigerant flow, the outdoor unit 100 includes a four-way valve 140, which is used to switch the refrigerant flow direction.

[0085] Specifically, the four-way valve 140 includes a first valve port d, which is connected to a fifth pipeline 121 , which is connected to the refrigerant outlet of the compressor 120 , so that the refrigerant in a high-temperature and high-pressure state can flow out of the compressor 120 from the fifth pipeline 121 through the first valve port d.

[0086] The four-way valve 140 includes a second valve port s, which is connected to a sixth pipeline 122 . The sixth pipeline 122 is connected to the refrigerant inlet of the compressor 120 , so that the refrigerant in a low-temperature and low-pressure state can flow back to the compressor 120 from the sixth pipeline 122 through the second valve port s.

[0087] The four-way valve 140 includes a third valve port c, which is connected to a seventh pipeline 111. The seventh pipeline 111 is connected to the outdoor heat exchanger 110 so that the refrigerant flowing out of the outdoor heat exchanger 110 can flow back to the compressor 120 through the third valve port c from the seventh pipeline 111, or the refrigerant flowing out of the compressor 120 can flow to the outdoor heat exchanger 110 from the seventh pipeline 111 through the third valve port c.

[0088] The four-way valve 140 includes a fourth valve port e, which is connected to the first main path 400. The first main path 400 is connected to the indoor unit so that the refrigerant in a high-temperature and high-pressure state can flow from the first main path 400 to the indoor unit through the fourth valve port e, or the refrigerant flowing out of the indoor unit can flow from the first main path 400 back to the compressor 120 through the fourth valve port e.

[0089] The first main path 400 is provided with a first stop valve 401 . The first stop valve 401 is provided to control the on-off of the first main path 400 , thereby controlling whether the refrigerant flows from the compressor 120 into the indoor unit.

[0090] The outdoor unit 100 includes a gas-liquid separator 160 , which is used to separate the refrigerant into gas and liquid; the gas-liquid separator 160 is disposed in the sixth pipeline 122 .

[0091] The gas-liquid separator 160 separates the refrigerant returning from the evaporator to the compressor 120 into gas and liquid, and returns only the gas to the compressor 120 , thereby preventing the liquid phase refrigerant from entering the compressor 120 and preventing the compressor 120 from liquid hammer.

[0092] In some embodiments, the compressor 120 is a gas-assisted enthalpy-increasing compressor 120, such as Figure 5-Figure 6 , Figure 9-10 and Fig.13 As shown, the compressor 120 may include an air supply port, which is connected to an air supply pipeline 610. The end of the air supply pipeline 610 away from the air supply port is connected to the second main path 500, and the connection point between the air supply pipeline 610 and the second main path 500 is located between the second stop valve 501 and the high-pressure liquid storage tank 130.

[0093] The air supply pipeline 610 is connected to an economizer 600 . The economizer 600 is also arranged in the second main path 500 . The economizer 600 is located between the second stop valve 501 and the high-pressure liquid storage tank 130 .

[0094] The air supply pipeline 610 is provided with a third expansion valve 601 , and the third expansion valve 601 is located between the economizer 600 , the air supply pipeline 610 and the connecting point of the second main path 500 .

[0095] Two heat exchange channels for heat exchange are defined in the economizer 600, one end of the first heat exchange channel can be connected to the high-pressure liquid storage tank, and the other end of the heat exchange channel can be connected to the second stop valve 501. One end of the second heat exchange channel can be connected to the high-pressure liquid storage tank through the third expansion valve 601, and the other end of the heat exchange channel can be connected to the air supply port of the compressor 120.

[0096] In the process of the liquid refrigerant flowing from the high-pressure liquid storage tank to the second stop valve 501, when the third expansion valve 601 is opened, part of the liquid refrigerant can flow into the second heat exchange channel, and due to the pressure reduction in the second heat exchange channel, the part of the liquid refrigerant can absorb the heat of the liquid refrigerant in the first heat exchange channel and vaporize in the second heat exchange channel, and the temperature of the refrigerant in the first heat exchange channel is lower. Subsequently, the vaporized refrigerant in the second heat exchange channel can be sucked into the air supply port of the compressor 120 along the air supply pipeline 610 to improve the energy efficiency ratio of the air conditioning system.

[0097] In some embodiments, Fig. 9 , Fig.10 and Fig.13 As shown, the outdoor unit 100 may include an oil separator 170, and the oil separator 170 is used to separate the lubricating oil in the refrigerant discharged from the compressor 120. The oil separator 170 is connected to an eighth pipeline 173, one end of the eighth pipeline 173 is connected to the sixth pipeline 122, and the other end of the eighth pipeline 173 is connected to the first valve port d. The lubricating oil separated by the oil separator 170 can be guided to the gas-liquid separator 160 through the sixth pipeline 122.

[0098] In other embodiments, the eighth pipeline 173 is connected to the first branch 174 , and the first branch 174 is provided with an oil return capillary 171 so that the lubricating oil separated by the oil separator 170 flows into the eighth pipeline 173 along the first branch 174 through the oil return capillary 171 .

[0099] The eighth pipeline 173 is connected to a second branch 175 . The second branch 175 is arranged in parallel with the first branch 174 . The second branch 175 is provided with a bypass solenoid valve 172 . The bypass solenoid valve 172 is used to balance the pressure in the first branch 174 .

[0100] like Figure 1 , Figure 5 , Fig. 9 and Fig.13 As shown, the indoor unit includes a convection terminal 200, which exchanges heat with the indoor air in the form of convection. The convection terminal 200 can have various implementation forms. The convection terminal 200 can be a wall-mounted air conditioner indoor unit, a vertical air conditioner indoor unit, or a duct unit, etc.

[0101] The convection terminal 200 includes an indoor heat exchanger, which is used to exchange heat with indoor air. The indoor heat exchanger is connected to the compressor 120 and the outdoor heat exchanger 110 .

[0102] The indoor heat exchanger, the compressor 120, the outdoor heat exchanger 110, and the first expansion valve 101 form a first refrigerant circulation loop through pipelines. The refrigerant flows in the first refrigerant circulation loop to achieve heating or cooling of the indoor environment by the convection terminal 200.

[0103] The indoor heat exchanger includes a third interface, the third interface is connected to the first pipeline 210, and the end of the first pipeline 210 away from the indoor heat exchanger is connected to the first main path 400; the indoor heat exchanger includes a fourth interface, the fourth interface is connected to the second pipeline 220, and the end of the second pipeline 220 away from the indoor heat exchanger is connected to the second main path 500.

[0104] In some embodiments, the convection terminal 200 may include an indoor fan 230, which is disposed close to the indoor heat exchanger to increase the heat exchange effect between the indoor air and the indoor heat exchanger.

[0105] The second pipeline 220 is provided with a fourth expansion valve 201, and the fourth expansion valve 201 is used to throttle the refrigerant passing therethrough.

[0106] In some embodiments, a plurality of convection terminals 200 are provided, and the plurality of convection terminals 200 are connected in parallel with each other.

[0107] like Figure 1 , Figure 5 , Fig. 9 and Fig.13 As shown, the indoor unit includes a radiation terminal 300 , which exchanges heat with the indoor air in the form of radiation heat transfer; the radiation terminal 300 is arranged in parallel with the convection terminal 200 .

[0108] In some embodiments, the radiation end 300 is a capillary tube laid on the ground.

[0109] In another embodiment, the capillary tube is also laid on the wall to increase the radiation area of ​​the radiation end 300 .

[0110] The radiation terminal 300 is connected to the compressor 120 and the outdoor heat exchanger 110 respectively. The radiation terminal 300, the compressor 120, the outdoor heat exchanger 110, and the first expansion valve 101 form a second refrigerant circulation loop through pipelines. The refrigerant flows in the second refrigerant circulation loop to achieve heating or cooling of the indoor environment by the convection terminal 200.

[0111] The radiation terminal 300 includes a first port, the first port is connected to the third pipeline 310, and the end of the third pipeline 310 away from the radiation terminal 300 is connected to the first main path 400; the radiation terminal 300 includes a second port, the second port is connected to the fourth pipeline 320, and the end of the fourth pipeline 320 away from the radiation terminal 300 is connected to the second main path 500.

[0112] It should be noted that the third pipeline 310 is arranged in parallel with the first pipeline 210 , and the fourth pipeline 320 is arranged in parallel with the second pipeline 220 .

[0113] In some embodiments, the radiation end 300 is provided in plurality, and the plurality of radiation ends 300 are arranged in parallel with each other.

[0114] like Figure 1 , Figure 5 , Fig. 9 and Fig.13 As shown, an electric ball valve 302 is provided in the third pipeline 310 , and the electric ball valve 302 is used to adjust the refrigerant flow in the third pipeline 310 .

[0115] When the air conditioning system is cooling, the refrigerant flows to the compressor 120 through the third pipeline 310 ; when the air conditioning system is heating, the refrigerant flows to the outdoor heat exchanger 110 through the third pipeline 310 .

[0116] In some embodiments, Figure 1 , Figure 5 and Fig. 9 As shown, a first one-way valve 301 is provided in the fourth pipeline 320 , and the first one-way valve 301 is provided to allow the refrigerant to flow in one direction in the fourth pipeline 320 .

[0117] Specifically, the first one-way valve 301 is used to prevent the refrigerant from flowing from the outdoor heat exchanger 110 into the radiation terminal 300 through the fourth pipeline 320 .

[0118] When the air-conditioning system is heating, under the action of the compressor 120, a part of the refrigerant flows through the first pipeline 210, the indoor heat exchanger, and the second pipeline 220 in sequence, and then flows into the outdoor heat exchanger 110, and the other part of the refrigerant flows through the third pipeline 310, the radiation terminal 300, and the fourth pipeline 320 in sequence, and then flows into the outdoor heat exchanger 110. The refrigerant flowing into the outdoor heat exchanger 110 flows back to the compressor 120.

[0119] When the air conditioning system is cooling, under the action of the compressor 120, the refrigerant flows through the outdoor heat exchanger 110 and the first expansion valve 101 in sequence, and then flows through the second pipeline 220, the indoor heat exchanger, the first pipeline 210 in sequence and then flows back to the compressor 120.

[0120] Since the radiation terminal 300 requires a high evaporation temperature when operating in cooling mode, while the convection terminal 200 requires a low evaporation temperature when operating in cooling mode, and since the evaporation temperatures of the radiation terminal 300 and the convection terminal 200 are different when operating, the two cannot operate at the same time, and the refrigerant can only circulate in the loop formed by the compressor 120, the outdoor heat exchanger 110, the first expansion valve 101, the second pipeline 220, the indoor heat exchanger, the first pipeline 210, and the compressor 120.

[0121] By setting a first one-way valve 301 in the fourth pipeline 320, the refrigerant is prevented from entering the radiation terminal 300 when the air-conditioning system is cooling, thereby ensuring the reliability of the operation of the air-conditioning system; when the air-conditioning system is heating, the refrigerant can be diverted to enter the convection terminal 200 and the radiation terminal 300, and the radiation terminal 300 and the convection terminal 200 can respectively exchange heat with the indoor air to provide a heating effect for the air-conditioning system.

[0122] In other embodiments, Fig.13 As shown, a second expansion valve 303 is provided in the fourth pipeline 320, and the second expansion valve 303 is used to throttle the refrigerant passing through it.

[0123] When the air-conditioning system is heating, under the action of the compressor 120, a part of the refrigerant flows through the first pipeline 210, the indoor heat exchanger, and the second pipeline 220 in sequence, and then flows into the outdoor heat exchanger 110, and the other part of the refrigerant flows through the third pipeline 310, the radiation terminal 300, and the fourth pipeline 320 in sequence, and then flows into the outdoor heat exchanger 110. The refrigerant flowing into the outdoor heat exchanger 110 flows back to the compressor 120.

[0124] When the air-conditioning system is cooling, under the action of the compressor 120, after the refrigerant flows into the outdoor heat exchanger 110, a part of the refrigerant flows into the second pipeline 220, and flows through the indoor heat exchanger and the first pipeline 210 in sequence before flowing back to the compressor 120, and the other part of the refrigerant flows into the fourth pipeline 320, and flows through the second expansion valve 303, the radiation terminal 300, and the third pipeline 310 in sequence before flowing back to the compressor 120.

[0125] By setting the second expansion valve 303, when the air-conditioning system is cooling, the refrigerant flowing into the radiation terminal 300 is throttled for the second time, so that the temperature of the refrigerant is reduced to an intermediate temperature, and then enters the capillary tube for radiation heat exchange; the refrigerant flowing out of the radiation terminal 300 is throttled again through the electric ball valve 302, so that the refrigerant temperature is further reduced to the same as the refrigerant temperature flowing out of the convection terminal 200, so as to ensure the normal operation of the air-conditioning system.

[0126] The air conditioning system can operate the convection terminal 200 and the radiation terminal 300 simultaneously for heating or cooling, which not only has a good heating or cooling effect but also operates stably and reliably.

[0127] In some embodiments, the second main circuit 500 is also connected to a second one-way valve 102 , which is arranged in parallel with the first expansion valve 101 . The second one-way valve 102 is connected to a third branch circuit 502 , and both ends of the third branch circuit 502 are respectively connected to the second main circuit 500 .

[0128] When the air-conditioning system is heating, the refrigerant flowing out of the outdoor heat exchanger 110 is throttled by the first expansion valve 101. When the refrigerant flow rate flowing out of the outdoor heat exchanger 110 is large, a part of the refrigerant can first flow into the third branch 502, and then flow into the second main path 500 from the third branch 502, so as to avoid reducing the refrigerant flowing into the indoor unit due to the throttling of the refrigerant by the first expansion valve 101.

[0129] Although the refrigerant flowing into the third branch 502 has not been throttled by the first expansion valve 101, the fourth expansion valve 201 will throttle the refrigerant flowing into the convection terminal 200, and the second expansion valve 303 will throttle the refrigerant entering the radiation terminal 300. Therefore, the fact that part of the refrigerant has not been throttled by the first expansion valve 101 has little effect on the temperature performance and reliability of the air-conditioning system.

[0130] The working principle of the air conditioning system is described below by taking the fourth pipeline 320 provided with the first non-return valve 301 as an example.

[0131] like Figure 4 , Figure 8 and Fig.12 As shown, when the air-conditioning system is cooling, the compressor 120 drives the refrigerant in a high-temperature and high-pressure state to enter the four-way valve 140 along the fifth pipeline 121. The refrigerant passes through the first valve port d and the third valve port c in sequence and then flows into the outdoor heat exchanger 110 along the seventh pipeline 111. After the refrigerant exchanges heat with the outdoor air, it continues to flow along the second main path 500 to the first expansion valve 101. The first expansion valve 101 converts the refrigerant in a high-pressure state into a refrigerant in a low-pressure state.

[0132] The refrigerant in the low-pressure state continues to flow along the second main path 500, and passes through the high-pressure liquid storage tank 130, the economizer 600 and the second stop valve 501 in sequence. Since the first one-way valve 301 is provided in the fourth pipeline 320, the refrigerant cannot enter the radiation terminal 300 through the fourth pipeline 320. Therefore, the refrigerant in the second main path 500 flows through the second stop valve 501 and then enters the convection terminal 200 along the second pipeline 220.

[0133] After the refrigerant entering the second pipeline 220 passes through the fourth expansion valve 201, the fourth expansion valve 201 performs secondary throttling on the refrigerant in a low-pressure state. The refrigerant after secondary throttling passes through the indoor heat exchanger to cool the indoor environment. The refrigerant in a low-pressure state absorbs the heat of the indoor environment and flows into the first main path 400 along the first pipeline 210. After passing through the first stop valve 401, the fourth valve port e and the second valve port s in sequence, it flows into the sixth pipeline 122, and after being processed by the gas-liquid separator 160, it flows back to the compressor 120.

[0134] like Figure 3 , Figure 7 and Fig.11As shown, when the air-conditioning system is heating, the compressor 120 drives the refrigerant in a high-temperature and high-pressure state to enter the four-way valve 140 along the fifth pipeline 121, and the refrigerant enters the first main path 400 after passing through the first valve port d and the fourth valve port e. After passing through the first stop valve 401, the refrigerant is divided into two paths, one path along the first pipeline 210 to enter the convection terminal 200, and the other path along the third pipeline 310 to enter the radiation terminal 300.

[0135] The refrigerant entering the convection terminal 200 undergoes convection heat exchange with the indoor air through the indoor heat exchanger and then enters the second pipeline 220. In the second pipeline 220, the refrigerant is throttled by the fourth expansion valve 201 and becomes a low-pressure refrigerant. The low-pressure refrigerant flows into the second main path 500.

[0136] The refrigerant entering the radiation terminal 300 enters the capillary of the radiation terminal 300 after the flow is adjusted by the electric ball valve 302. The high-temperature and high-pressure refrigerant exchanges heat with the indoor air and enters the fourth pipeline 320, passes through the first one-way valve 301, and then flows into the second main path 500.

[0137] The refrigerant flowing into the second main path 500 continues to flow along the second main path 500 and passes through the second stop valve 501, the high-pressure liquid storage tank 130, and the first expansion valve 101 in sequence. The refrigerant flows into the outdoor heat exchanger 110 after secondary throttling through the first expansion valve 101. The refrigerant in the low-temperature and low-pressure state exchanges heat with the outdoor air and flows into the sixth pipeline 122 along the seventh pipeline 111 through the third valve port c and the second valve port s. After being processed by the gas-liquid separator 160, it flows back to the compressor 120.

[0138] It should be noted that when the radiation terminal 300 is not needed to operate, closing the electric ball valve 302 can prevent the refrigerant from flowing from the first main path 400 into the radiation terminal 300 when the air-conditioning system is heating.

[0139] The working principle of the air conditioning system is described below by taking the example that the second expansion valve 303 is provided in the fourth pipeline 320.

[0140] like Fig.12 and Fig.15As shown, the air conditioning system performs refrigeration, the compressor 120 drives the refrigerant in a high-temperature and high-pressure state to enter the four-way valve 140 along the fifth pipeline 121, and the refrigerant passes through the first valve port d and the third valve port c in sequence and then flows into the outdoor heat exchanger 110 along the seventh pipeline 111. The refrigerant in a high-temperature and high-pressure state is transformed into a refrigerant in a low-temperature and high-pressure state after heat exchange with the outdoor air. When the refrigerant in a low-temperature and high-pressure state flows along the second main path 500 to the first expansion valve 101, the first expansion valve 101 changes the refrigerant in a low-temperature and high-pressure state into a refrigerant in a low-temperature and low-pressure state. The refrigerant continues to flow along the second main path 500, and after passing through the high-pressure liquid storage tank 130, the economizer 600 and the second stop valve 501 in sequence, the refrigerant is divided into two paths, one path enters the radiation terminal 300 along the fourth pipeline 320, and the other path enters the convection terminal 200 along the second pipeline 220;

[0141] After the refrigerant entering the second pipeline 220 passes through the fourth expansion valve 201, the fourth expansion valve 201 performs secondary throttling on the low-temperature and low-pressure refrigerant. The refrigerant after secondary throttling passes through the indoor heat exchanger to cool the indoor environment. After absorbing the heat from the indoor environment, the low-temperature and low-pressure refrigerant flows into the first main path 400 along the first pipeline 210.

[0142] After the refrigerant entering the fourth pipeline 320 passes through the second expansion valve 303 , the second expansion valve 303 performs secondary throttling on the low-temperature and low-pressure refrigerant, and the refrigerant after secondary throttling passes through the capillary pipeline of the radiation terminal 300 to cool the indoor environment.

[0143] After absorbing the heat from the indoor environment, the low-temperature and low-pressure refrigerant flows into the first main circuit 400 along the third pipeline 310 through the electric ball valve 302. Since the first main circuit 400 also has refrigerant flowing in from the first pipeline 210, the refrigerant flowing into the first main circuit 400 from the first pipeline 210 and the refrigerant flowing into the first main circuit 400 from the third pipeline 310 have different temperatures, and the refrigerant in the first main circuit 400 will eventually flow back to the compressor 120. Therefore, the flow rate of the refrigerant flowing into the first main circuit 400 from the third pipeline 310 is regulated by the electric ball valve 302 so that the refrigerant flowing into the first main circuit 400 from the third pipeline 310 and the refrigerant flowing into the first main circuit 400 from the first pipeline 210 have the same temperature.

[0144] The refrigerant in the first main circuit 400 flows into the sixth pipeline 122 after passing through the first stop valve 401 , the fourth valve port e and the second valve port s in sequence, and flows back to the compressor 120 after being processed by the gas-liquid separator 160 .

[0145] When the air-conditioning system is cooling, an electric ball valve 302 is set at the refrigerant output end of the radiation terminal 300, and the electric ball valve 302 is used to adjust the refrigerant flow rate flowing out of the radiation terminal 300 so that the temperature of the refrigerant flowing out of the radiation terminal 300 is the same as the temperature of the refrigerant flowing out of the convection terminal 200, so that the refrigerant can cool the indoor environment through the radiation terminal 300 and the convection terminal 200 at the same time, and the stability of the air-conditioning system movement can be ensured.

[0146] like Fig.11 and Fig.14 As shown, when the air-conditioning system is heating, the compressor 120 drives the refrigerant in a high-temperature and high-pressure state to enter the four-way valve 140 along the fifth pipeline 121, and the refrigerant enters the first main path 400 after passing through the first valve port d and the fourth valve port e. After passing through the first stop valve 401, the refrigerant is divided into two paths, one path along the first pipeline 210 to enter the convection terminal 200, and the other path along the third pipeline 310 to enter the radiation terminal 300.

[0147] After the refrigerant entering the convection terminal 200 passes through the indoor heat exchanger and performs convection heat exchange with the indoor air, the refrigerant in a high-temperature and high-pressure state becomes a refrigerant in a low-temperature and high-pressure state. The refrigerant in a low-temperature and high-pressure state enters the second pipeline 220, and in the second pipeline 220, it is throttled by the fourth expansion valve 201 and becomes a refrigerant in a low-temperature and low-pressure state. The refrigerant in a low-temperature and low-pressure state flows into the second main path 500.

[0148] The refrigerant entering the radiation terminal 300 enters the capillary tube of the radiation terminal 300 after the flow rate is adjusted by the electric ball valve 302. The refrigerant in the high temperature and high pressure state becomes the refrigerant in the low temperature and high pressure state after heat exchange with the indoor air. The refrigerant in the low temperature and high pressure state enters the fourth pipeline 320 and becomes the refrigerant in the low temperature and low pressure state after throttling by the second expansion valve 303. The refrigerant in the low temperature and low pressure state flows into the second main circuit 500.

[0149] The refrigerant flowing into the second main path 500 continues to flow along the second main path 500 and passes through the second stop valve 501, the high-pressure liquid storage tank 130, and the first expansion valve 101 in sequence. The refrigerant flows into the outdoor heat exchanger 110 after secondary throttling through the first expansion valve 101. The refrigerant in the low-temperature and low-pressure state exchanges heat with the outdoor air and flows into the sixth pipeline 122 along the seventh pipeline 111 through the third valve port c and the second valve port s. After being processed by the gas-liquid separator 160, it flows back to the compressor 120.

[0150] It should be noted that when the air-conditioning system is heating, the electric ball valve 302 can perform a primary throttling on the high-temperature and high-pressure refrigerant flowing into the radiation terminal 300, and the second expansion valve 303 can perform a secondary throttling on the refrigerant flowing out of the radiation terminal 300 to adjust the temperature of the refrigerant flowing from the radiation terminal 300 into the second main path 500.

[0151] It should also be noted that when the radiation terminal 300 is not needed to operate, closing the electric ball valve 302 and the second expansion valve 303 can prevent the refrigerant from entering the radiation terminal 300 and avoid the refrigerant in the first main path 400 or the second main path 500 from migrating into the radiation terminal 300.

[0152] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

[0153] For the convenience of explanation, the above description has been made in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or limit the embodiments to the specific forms disclosed above. Based on the above teachings, various modifications and variations can be obtained. The selection and description of the above embodiments are to better explain the principles and practical applications, so that those skilled in the art can better use the embodiments and various different variations of the embodiments suitable for specific use considerations.

Claims

1. An air conditioning system, It is characterized in that include: An outdoor heat exchanger, used for exchanging heat with outdoor air; A compressor is used to drive the flow of refrigerant; It is in communication with the outdoor heat exchanger; a first expansion valve, for throttling the refrigerant passing therethrough; A convection terminal, used for convection heat exchange with indoor air; the convection terminal includes an indoor heat exchanger, and the indoor heat exchanger, the compressor, the outdoor heat exchanger and the first expansion valve form a first refrigerant circulation loop through a pipeline; A radiation terminal, used for radiating heat transfer with indoor air; the radiation terminal is arranged in parallel with the convection terminal; the radiation terminal, the compressor, the outdoor heat exchanger and the first expansion valve form a second refrigerant circulation loop through a pipeline; an electric ball valve, which is arranged in the second refrigerant circulation loop and located between the radiation end and the compressor, and is used to adjust the refrigerant flow from the radiation end to the compressor; a second expansion valve, which is disposed in the second refrigerant circulation loop and is located between the outdoor heat exchanger and the radiation terminal, and is used to throttle the refrigerant passing therethrough; The compressor drives the refrigerant to flow through the outdoor heat exchanger and the first expansion valve in sequence, and a part of the refrigerant flows back to the compressor after flowing through the indoor heat exchanger, and the other part of the refrigerant flows back to the compressor after secondary throttling through the second expansion valve through the radiation terminal and the electric ball valve in sequence; The compressor drives a part of the refrigerant to flow into the outdoor heat exchanger after passing through the indoor heat exchanger; the compressor drives another part of the refrigerant to flow into the outdoor heat exchanger after passing through the electric ball valve, the radiation terminal, and the second expansion valve in sequence; wherein the refrigerant flowing into the outdoor heat exchanger flows back to the compressor after passing through the first expansion valve.

2. An air conditioning system, It is characterized in that include: An outdoor heat exchanger, used for exchanging heat with outdoor air; A compressor is used to drive the flow of refrigerant; It is in communication with the outdoor heat exchanger; a first expansion valve, for throttling the refrigerant passing therethrough; A convection terminal, used for convection heat exchange with indoor air; the convection terminal includes an indoor heat exchanger, and the indoor heat exchanger, the compressor, the outdoor heat exchanger and the first expansion valve form a first refrigerant circulation loop through a pipeline; A radiation terminal, used for radiating heat transfer with indoor air; the radiation terminal is arranged in parallel with the convection terminal; the radiation terminal, the compressor, the outdoor heat exchanger and the first expansion valve form a second refrigerant circulation loop through a pipeline; an electric ball valve, which is arranged in the second refrigerant circulation loop and located between the radiation end and the compressor, and is used to adjust the refrigerant flow from the radiation end to the compressor; a first one-way valve, which is arranged in the second refrigerant circulation loop and is located between the outdoor heat exchanger and the radiation end, and is used to prevent the refrigerant from flowing from the outdoor heat exchanger into the radiation end; The compressor drives the refrigerant to flow in the first refrigerant circulation loop; The compressor drives a part of the refrigerant to flow into the outdoor heat exchanger after passing through the indoor heat exchanger; the compressor drives another part of the refrigerant to flow into the outdoor heat exchanger after passing through the electric ball valve, the radiation terminal, and the first one-way valve in sequence; wherein the refrigerant flowing into the outdoor heat exchanger flows back to the compressor after passing through the first expansion valve.

3. The air conditioning system according to claim 1 or 2, It is characterized in that The indoor heat exchanger is connected to a first pipeline and a second pipeline, the first pipeline is connected to the compressor, and the second pipeline is connected to the outdoor heat exchanger; the radiation terminal is connected to a third pipeline and a fourth pipeline, the third pipeline is connected to the compressor, and the fourth pipeline is connected to the outdoor heat exchanger; the electric ball valve is arranged in the third pipeline, and the second expansion valve or the first check valve is arranged in the fourth pipeline.

4. The air conditioning system according to claim 3, It is characterized in that It also includes a first main circuit, which is connected to the compressor. The first pipeline and the third pipeline are connected in parallel to an end of the first main circuit away from the compressor. The first main circuit is provided with a first stop valve.

5. The air conditioning system according to claim 4, It is characterized in that It also includes a four-way valve, which includes a first valve port, a second valve port, a third valve port and a fourth valve port. The first valve port is connected to a fifth pipeline, which is connected to the refrigerant outlet of the compressor. The second valve port is connected to a sixth pipeline, which is connected to the refrigerant inlet of the compressor. The third valve port is connected to a seventh pipeline, which is connected to the outdoor heat exchanger. The fourth valve port is connected to the first main circuit.

6. The air conditioning system according to claim 5, It is characterized in that It also includes an oil separator, which is connected to an eighth pipeline. One end of the eighth pipeline is connected to the sixth pipeline, and the other end of the eighth pipeline is connected to the first valve port.

7. The air conditioning system according to claim 3, It is characterized in that It also includes a second main circuit, which is connected to the outdoor heat exchanger. The second pipeline and the fourth pipeline are connected in parallel to an end of the second main circuit away from the outdoor heat exchanger. The second main circuit is provided with a second stop valve.

8. The air conditioning system according to claim 7, It is characterized in that The first expansion valve is arranged in the second main path, and the first expansion valve is arranged between the second stop valve and the outdoor heat exchanger.

9. The air conditioning system according to claim 7, It is characterized in that The second main circuit is also provided with an economizer, which is arranged between the second stop valve and the outdoor heat exchanger; the economizer is connected to an air supply pipeline, one end of which is connected to the second pipeline, and the other end of which is connected to the compressor.

10. The air conditioning system according to claim 1 or 2, It is characterized in that The radiation terminal is provided in a plurality and the plurality of the radiation terminals are mutually arranged in parallel; the convection terminal is provided in a plurality and the plurality of the convection terminals are mutually arranged in parallel.

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