Refrigerant circulation system, air conditioning equipment, and control method of refrigerant circulation system

Abstract

The present invention relates to a refrigerant circulation system, air-conditioning equipment and a control method for the refrigerant circulation system. The refrigerant circulation system includes a compressor, a first control valve, a first outdoor heat exchanger, a first pipeline, a second control valve, a second pipeline, a third pipeline, a first throttling component, an accumulator and an indoor heat exchanger. The accumulator includes a first refrigerant inlet and a second refrigerant inlet and a second refrigerant inlet. The first refrigerant inlet and the accumulator can be switched between a first state and a second state. In the first state, refrigerant flows between the first refrigerant inlet and the accumulator and the first throttling component. In the second state, refrigerant flows between the first refrigerant inlet and the accumulator and the first pipeline. The second refrigerant inlet and the accumulator can be switched between a third state and a fourth state. In the third state, refrigerant flows between the second refrigerant inlet and the accumulator and the second pipeline or the exhaust port of the compressor. In the fourth state, refrigerant flows between the second refrigerant inlet and the third pipeline of the accumulator.

Description

Technical Field

[0001] The present invention relates to the field of refrigeration technology, and in particular to a refrigerant circulation system, air-conditioning equipment, and a control method for the refrigerant circulation system. Background Art

[0002] With the continuous development of air-conditioning technology, people gradually pay more attention to the energy-saving and environmental protection performance of air-conditioning. At the same time, people also need the air-conditioning system to be able to work in different modes. Summary of the Invention

[0003] The present invention aims to provide a refrigerant circulation system with multiple operating modes, air-conditioning equipment, and a control method for the refrigerant circulation system.

[0004] According to one aspect of an embodiment of the present invention, the present invention provides a refrigerant circulation system, the refrigerant circulation system comprising:

[0005] The compressor includes an intake port for introducing the refrigerant to be compressed and an exhaust port for discharging the compressed refrigerant;

[0006] The first control valve comprises an inlet connected to the exhaust port of the compressor, a return port connected to the suction port of the compressor, and a working port selectively connected to one of the inlet and the return port;

[0007] a first outdoor heat exchanger connected to a working port of the first control valve;

[0008] a first pipeline, connected to the first outdoor heat exchanger;

[0009] The second control valve includes an inlet connected to the exhaust port of the compressor and a working port that can be connected to and disconnected from the inlet;

[0010] a second pipeline connected to a working port of a second control valve;

[0011] a third pipeline connected to the suction port of the compressor;

[0012] a first throttling component, communicating with the first pipeline;

[0013] The accumulator includes a first refrigerant inlet and a second refrigerant inlet, the first refrigerant inlet of the accumulator being switchable between a first state and a second state, wherein refrigerant flows between the first refrigerant inlet and the first throttling component in the first state and between the first refrigerant inlet and the first pipeline in the second state, the second refrigerant inlet of the accumulator being switchable between a third state and a fourth state, wherein refrigerant flows between the second refrigerant inlet and the second pipeline or the exhaust port of the compressor in the third state and between the second refrigerant inlet and the third pipeline in the fourth state;

[0014] The indoor heat exchanger includes a first refrigerant inlet and a second refrigerant inlet. The first refrigerant inlet and the second refrigerant inlet of the indoor heat exchanger are connected to the first pipeline, and the second refrigerant inlet and the second refrigerant inlet of the indoor heat exchanger can be selectively connected to one of the second pipeline and the third pipeline.

[0015] In some embodiments, the second refrigerant inlet and outlet of the accumulator further has a fifth state in which refrigerant flows with the first pipeline. The second refrigerant inlet and outlet of the accumulator can be switched between the third state, the fourth state and the fifth state.

[0016] In some embodiments, the refrigerant circulation system further comprises:

[0017] A third control valve includes an inlet connected to the exhaust port of the compressor, a return port connected to the suction port of the compressor, and a working port, wherein the working port can be selectively connected to one of the inlet and the return port;

[0018] One end of the second outdoor heat exchanger is communicated with the working port of the second control valve, and the other end is communicated with the first pipeline.

[0019] In some embodiments, the refrigerant circulation system further comprises:

[0020] A second throttling component includes a first inlet and outlet communicating with the first outdoor heat exchanger and a second inlet and outlet communicating with the first pipeline;

[0021] The third throttling component includes a first inlet and outlet communicating with the second outdoor heat exchanger and a second inlet and outlet communicating with the first pipeline. The second inlet and outlet of the third throttling component are communicated with the second inlet and outlet of the second throttling component.

[0022] In some embodiments, the second control valve further includes a return port communicating with the suction port of the compressor, and the working port of the second control valve can selectively communicate with one of the inlet of the second control valve and the return port of the second control valve.

[0023] In some embodiments, the refrigerant circulation system further comprises:

[0024] a first communicating pipe, one end of which is connected to the first refrigerant inlet and outlet, and the other end of which is connected to the first pipe, wherein the first throttling component is provided in the first communicating pipe;

[0025] The second connecting pipe is connected to the first refrigerant inlet and outlet at one end and to the first pipe at the other end. The connection between the second connecting pipe and the first pipe is closer to the indoor heat exchanger in the flow direction of the first pipe than the connection between the first connecting pipe and the first pipe.

[0026] In some embodiments, the refrigerant circulation system further comprises:

[0027] a first on-off valve provided in the first pipeline and located between a connection point between the first communicating pipeline and the first pipeline and a connection point between the second communicating pipeline and the first pipeline;

[0028] The first one-way valve is arranged in the second communicating pipeline, and the inlet end of the first one-way valve is communicated with the first refrigerant inlet and outlet of the accumulator.

[0029] In some embodiments, the refrigerant circulation system further comprises:

[0030] a third connecting pipe, one end of which is connected to the exhaust port of the compressor or the second pipe, and the other end of which is connected to the second refrigerant inlet and outlet of the accumulator;

[0031] The fourth connecting pipeline has one end connected to the second refrigerant inlet and outlet of the accumulator, and the other end connected to the third pipeline.

[0032] In some embodiments, the refrigerant circulation system further comprises:

[0033] a second on-off valve, disposed in the third connecting pipeline;

[0034] The third switch valve is arranged in the fourth connecting pipeline.

[0035] In some embodiments, the other end of the third connecting line is connected to the first connecting line connecting the first refrigerant inlet and outlet and the first line, and the connection between the other end of the third connecting line and the first connecting line is located between the first line and the first throttling component in the flow direction of the first connecting line. The refrigerant circulation system also includes a fifth connecting line, one end of the fifth connecting line is connected to the first connecting line, and the other end is connected to the second refrigerant inlet and outlet of the accumulator.

[0036] In some embodiments, a connection point between one end of the fifth communicating line and the first communicating line is located between the first line and the first throttling component in the flow direction of the first communicating line.

[0037] In some embodiments, the refrigerant circulation system further comprises:

[0038] a fourth on-off valve, provided in the fifth connecting pipe;

[0039] The second one-way valve is provided in the first communicating line and is located between the first line and the fifth communicating line in the flow direction of the first communicating line.

[0040] In some embodiments, the refrigerant circulation system further comprises:

[0041] a refrigeration control valve, one end of which is connected to the second refrigerant inlet and outlet of the indoor heat exchanger, and the other end of which is connected to the third pipeline;

[0042] The heating control valve has one end connected to the second refrigerant inlet and outlet of the indoor heat exchanger, and the other end connected to the second pipeline.

[0043] According to another aspect of the present invention, an air-conditioning device is provided. The air-conditioning device includes the above-mentioned refrigerant circulation system.

[0044] According to another aspect of the present invention, a control method for the above-mentioned refrigerant circulation system is also provided. In some embodiments, the method comprises controlling the refrigerant circulation system to operate in at least one of a cold storage mode, a heat storage mode, a heat release mode, and a heat release mode, wherein:

[0045] In the cold storage mode, the inlet and the working port of the first control valve are controlled to be connected, the first refrigerant inlet and outlet of the accumulator are in the first state to communicate with the first throttling component, and the second refrigerant inlet and outlet of the accumulator are in the fourth state to communicate with the third pipeline;

[0046] In the heat storage mode, the return port of the first control valve is controlled to be connected to the working port, the first refrigerant inlet and outlet of the accumulator are in the second state to be connected to the first pipeline, and the second refrigerant inlet and outlet of the accumulator are in the third state to be connected to the second pipeline or the exhaust port of the compressor;

[0047] In the heat release mode, the second refrigerant inlet and outlet of the accumulator is in the fourth state to communicate with the third pipeline, and the first refrigerant inlet and outlet of the accumulator is in the first state to communicate with the first throttling component;

[0048] In the cooling capacity release mode, the first refrigerant inlet and outlet of the accumulator are in the second state to communicate with the first pipeline, and the second refrigerant inlet and outlet of the accumulator are in the third state to communicate with the second pipeline or the exhaust port of the compressor.

[0049] In some embodiments, the control method includes:

[0050] During periods of high electricity prices, the refrigerant circulation system operates in a cooling mode or a heat release mode; during periods of low electricity prices, the refrigerant circulation system operates in a cooling mode or a heat storage mode.

[0051] In some embodiments, the control method includes:

[0052] Install multiple indoor heat exchangers in parallel; or

[0053] A second outdoor heat exchanger and a third control valve are set in parallel with the first outdoor heat exchanger. The third control valve includes an inlet connected to the exhaust port of the compressor, a return port connected to the suction port of the compressor, and a working port. The working port can be selectively connected to one of the inlet and the return port.

[0054] In some embodiments, the control method includes controlling an outdoor unit of the refrigerant circulation system to operate in at least one of the following operating modes:

[0055] Complete condensation: The inlet and working port of the first control valve are connected, the inlet and working port of the second control valve are not connected, the inlet and working port of the third control valve are connected, the first outdoor heat exchanger and the second outdoor heat exchanger both serve as condensers, and the refrigerant condenses in the first and second outdoor heat exchangers;

[0056] The main body is condensed, the inlet and working port of the first control valve are connected, the inlet and working port of the second control valve are connected to transport part of the refrigerant to the indoor heat exchanger and / or accumulator for condensation, and the inlet and working port of the third control valve are connected.

[0057] Complete evaporation: The return port and the working port of the first control valve are connected, the inlet and the working port of the second control valve are connected, and the return port and the working port of the third control valve are connected. The refrigerant condenses in the indoor heat exchanger and / or the accumulator, and the condensed refrigerant is transported to the first outdoor heat exchanger and the second outdoor heat exchanger for evaporation;

[0058] Main body evaporation: The return port and the working port of the first control valve are connected, and the inlet and the working port of the second control valve are connected to transport part of the refrigerant to the indoor heat exchanger and / or the accumulator for condensation. The return port and the working port of the third control valve are connected, and part of the refrigerant condenses in the indoor heat exchanger and / or the accumulator. The condensed refrigerant is transported to the first outdoor heat exchanger and the second outdoor heat exchanger for evaporation. Part of the refrigerant evaporates in the indoor heat exchanger and / or the accumulator, and the evaporated refrigerant is transported to the suction port of the compressor through the third pipeline;

[0059] The heat exchanger of the outdoor unit is shut down: the inlet and working port of the second control valve are connected, and the refrigerant is transported to one of the indoor heat exchanger and / or accumulator for condensation, evaporated in the other, and then transported to the suction port of the compressor through the third pipeline;

[0060] Complete condensation partition: the return port and the working port of the first control valve are connected, the inlet and the working port of the second control valve are not connected, the inlet and the working port of the third control valve are connected, the first outdoor heat exchanger acts as an evaporator, and the second outdoor heat exchanger acts as a condenser;

[0061] Main condensation partition: The return port and the working port of the first control valve are connected, and the inlet and the working port of the second control valve are connected to transport part of the refrigerant to the indoor heat exchanger and / or accumulator for condensation. The inlet and the working port of the third control valve are connected, the first outdoor heat exchanger acts as an evaporator, and the second outdoor heat exchanger acts as a condenser;

[0062] Complete evaporation partition: The return port and the working port of the first control valve are connected, and the inlet and the working port of the second control valve are connected to transport part of the refrigerant to the indoor heat exchanger and / or accumulator for condensation. The inlet and the working port of the third control valve are connected, the first outdoor heat exchanger serves as the evaporator, and the second outdoor heat exchanger serves as the condenser. The refrigerant condensed in the indoor heat exchanger and / or the accumulator is transported to the first outdoor heat exchanger through the first pipeline for evaporation;

[0063] Main evaporation partition: the return port and the working port of the first control valve are connected, and the inlet and the working port of the second control valve are connected to transport part of the refrigerant to the indoor heat exchanger and / or accumulator for condensation. The inlet and the working port of the third control valve are connected, the first outdoor heat exchanger serves as the evaporator, and the second outdoor heat exchanger serves as the condenser. Part of the refrigerant evaporates in the indoor heat exchanger and / or the accumulator and is then transported to the suction port of the compressor through the third pipeline.

[0064] In some embodiments, the accumulator of the refrigerant circulation system operates in at least one of the following operating modes:

[0065] The accumulator serves as an evaporator: the inlet and the working port of the first control valve are connected, the first refrigerant inlet and outlet of the accumulator are in a first state to communicate with the first throttling component, and the second refrigerant inlet and outlet of the accumulator are in a fourth state to communicate with the third pipeline. The refrigerant compressed by the compressor is condensed by the first outdoor heat exchanger and then throttled by the first throttling component. The throttled refrigerant enters the accumulator and evaporates to absorb heat. The evaporated refrigerant discharged from the second refrigerant inlet and outlet of the accumulator is transported to the suction port of the compressor through the third pipeline.

[0066] The accumulator serves as a subcooler: the inlet and the working port of the first control valve are connected, the second refrigerant inlet and outlet of the accumulator are in the fifth state to communicate with the first pipeline, and the first refrigerant inlet and outlet of the accumulator are in the second state to communicate with the third pipeline. The refrigerant compressed by the compressor is condensed by the first outdoor heat exchanger and then throttled by the second throttling component. The throttled refrigerant enters the accumulator, evaporates, and absorbs heat. The first refrigerant inlet and outlet of the accumulator transports the discharged evaporated refrigerant to the indoor heat exchanger through the first pipeline.

[0067] The accumulator serves as a condenser: the first refrigerant inlet and outlet of the accumulator is in the second state to be connected to the first pipeline; the second refrigerant inlet and outlet is in the third state to circulate refrigerant between the second pipeline or the exhaust port of the compressor, and the refrigerant compressed by the compressor is transported to the accumulator for condensation. The condensed refrigerant is transported to the first pipeline through the first refrigerant inlet and outlet of the accumulator, and the first pipeline transports the condensed refrigerant to the indoor heat exchanger.

[0068] In some embodiments, the refrigerant circulation system operates in at least one of the following operating modes:

[0069] Conventional full cooling: In conventional full cooling mode, the inlet and working port of the first control valve are connected, the inlet and working port of the second control valve are not connected, the inlet and working port of the third control valve are connected, and the accumulator is turned off. The first switch valve in the first section of the pipeline in parallel with the accumulator is opened, the first outdoor heat exchanger and the second outdoor heat exchanger both act as condensers, the accumulator is turned off, and the indoor heat exchanger acts as an evaporator.

[0070] Conventional cooling: In conventional cooling mode, the inlet and working port of the second control valve are connected to transport part of the compressed refrigerant to the indoor heat exchanger for condensation, and the other part of the refrigerant is condensed in the first outdoor heat exchanger and / or the second outdoor heat exchanger. The condensed refrigerant evaporates in the indoor heat exchanger. When the evaporation amount of the refrigerant in the indoor heat exchanger is greater than the condensation amount, the accumulator is shut down and the first switch valve is opened.

[0071] Complete cold storage: In complete cold storage mode, the refrigerant is compressed in the compressor and condensed in the first outdoor heat exchanger and / or the second outdoor heat exchanger. The condensed refrigerant evaporates in the accumulator, which stores cold energy. The indoor unit of the refrigerant circulation system including the indoor heat exchanger is shut down, and the first on / off valve is closed.

[0072] Cold storage and complete cooling: In the cold storage and complete cooling mode, the refrigerant is compressed in the compressor, and the compressed refrigerant is completely condensed in the first outdoor heat exchanger and / or the second outdoor heat exchanger. The condensed refrigerant evaporates in the accumulator and the indoor heat exchanger, and the first on-off valve is opened;

[0073] Cooling storage and simultaneous full heating with outdoor unit condensing: In the cooling storage and simultaneous full heating with outdoor unit condensing mode, the refrigerant is in the compressor, partially compressed refrigerant is condensed in the first outdoor heat exchanger and / or the second outdoor heat exchanger, partially compressed refrigerant is condensed in the indoor heat exchanger, the condensed refrigerant evaporates in the accumulator, and the first on-off valve is open;

[0074] Cooling storage and simultaneous full heating with outdoor unit evaporation: In the cooling storage and simultaneous full heating with outdoor unit evaporation mode, the refrigerant is compressed in the compressor, condensed in the indoor heat exchanger, partially condensed in the first outdoor heat exchanger and / or the second outdoor heat exchanger, and partially evaporated in the accumulator. The accumulator stores cold energy, and the first on / off valve is opened.

[0075] Cold storage and main body cooling: In the cold storage and main body cooling mode, the refrigerant is compressed in the compressor, and part of the compressed refrigerant is condensed in the first outdoor heat exchanger and / or the second outdoor heat exchanger. The part of the compressed refrigerant is condensed in the indoor heat exchanger, and the part of the condensed refrigerant evaporates in the accumulator. The accumulator stores cold energy, and the part of the condensed refrigerant evaporates in the indoor heat exchanger. When the evaporation amount of the refrigerant in the indoor heat exchanger is greater than the condensation amount, the first on-off valve opens;

[0076] Cold storage with main body heating and outdoor unit evaporation: In the cold storage with main body heating and outdoor unit evaporation mode, the refrigerant is compressed in the compressor, condensed in the indoor heat exchanger after compression, and partially condensed refrigerant evaporates in the indoor heat exchanger. The evaporation amount of the refrigerant in the indoor heat exchanger is less than the condensation amount. The partially condensed refrigerant evaporates in the accumulator, which stores cold energy. The partially condensed refrigerant evaporates in the first outdoor heat exchanger and / or the second outdoor heat exchanger, and the first on / off valve is opened.

[0077] Cold storage with main body heating and outdoor unit condensing: In the cold storage with main body heating and outdoor unit condensing mode, the refrigerant is compressed in the compressor, part of the compressed refrigerant is condensed in the first outdoor heat exchanger and / or the second outdoor heat exchanger, part of the compressed refrigerant is condensed in the indoor heat exchanger, part of the condensed refrigerant is evaporated in the accumulator, part of the condensed refrigerant is evaporated in the indoor heat exchanger, and the first on-off valve is opened;

[0078] Subcooling and simultaneous full cooling: In the subcooling and simultaneous full cooling mode, the refrigerant is compressed in the compressor, and the fully compressed refrigerant is condensed in the first outdoor heat exchanger and / or the second outdoor heat exchanger. The condensed refrigerant enters the accumulator for subcooling. The accumulator acts as a subcooler, and the subcooled refrigerant is transported to the indoor heat exchanger for evaporation. The first on-off valve is closed.

[0079] Subcooling and cooling with simultaneous main cooling: In the subcooling and cooling with simultaneous main cooling mode, the refrigerant is compressed in the compressor, and part of the compressed refrigerant is condensed in the first outdoor heat exchanger and / or the second outdoor heat exchanger. The condensed refrigerant enters the accumulator for subcooling. The accumulator acts as a subcooler, and the subcooled refrigerant is transported to the indoor heat exchanger for evaporation. Part of the compressed refrigerant condenses in the indoor heat exchanger, and the first on-off valve is closed.

[0080] Condensation and cooling with simultaneous full cooling: In the condensation and cooling with simultaneous full cooling mode, the outdoor unit is shut down, the refrigerant is compressed in the compressor, the compressed refrigerant is condensed in the accumulator, the accumulator releases the cooling capacity, the condensed refrigerant evaporates in the indoor heat exchanger, and the first switch valve is closed;

[0081] Condensation and cooling with simultaneous cooling: In the condensation and cooling mode, the outdoor unit is shut down, the refrigerant is compressed in the compressor, and part of the compressed refrigerant is condensed in the accumulator. The accumulator releases the cooling capacity, and the condensed refrigerant evaporates in the indoor heat exchanger. Part of the compressed refrigerant is condensed in the indoor heat exchanger, and the first switch valve is closed.

[0082] Parallel cooling and simultaneous complete cooling: In the parallel cooling and simultaneous complete cooling mode, the refrigerant is compressed in the compressor, and the partially compressed refrigerant is condensed in the first outdoor heat exchanger and / or the second outdoor heat exchanger. The partially compressed refrigerant is condensed in the accumulator, the accumulator releases the cooling capacity, and the condensed refrigerant evaporates in the indoor heat exchanger, and the first on-off valve is closed;

[0083] Parallel cooling and simultaneous main cooling: In the parallel cooling and simultaneous main cooling mode, the refrigerant is compressed in the compressor, and part of the compressed refrigerant is condensed in the first outdoor heat exchanger and / or the second outdoor heat exchanger, and part of the compressed refrigerant is condensed in the accumulator. The accumulator releases the cooling capacity, and the condensed refrigerant evaporates in the indoor heat exchanger, and part of the compressed refrigerant is condensed in the indoor heat exchanger. The first switch valve is closed.

[0084] Among them, full heating means that multiple indoor heat exchangers are used as condensers for heating.

[0085] When the main unit is heating, the condensation amount of the refrigerant in the indoor heat exchanger is greater than the evaporation amount. When the main unit is cooling, the condensation amount of the refrigerant in the indoor heat exchanger is less than the evaporation amount. When the main unit is heating, the indoor heat exchanger is only used to condense the refrigerant. When the main unit is cooling, the indoor heat exchanger is only used to evaporate the refrigerant.

[0086] In some embodiments, the refrigerant circulation system operates in at least one of the following operating modes:

[0087] Conventional full heating: In conventional full heating mode, the refrigerant is compressed in the compressor, the accumulator is shut down, the compressed refrigerant is condensed in the indoor heat exchanger, the condensed refrigerant is evaporated in the first outdoor heat exchanger and / or the second outdoor heat exchanger, the evaporated refrigerant is delivered to the suction port of the compressor, and the first on-off valve in the first section of the pipeline in parallel with the accumulator is opened;

[0088] Conventional main heating: In conventional full main heating mode, the refrigerant is compressed in the compressor, the accumulator is shut down, and part of the compressed refrigerant is condensed in the indoor heat exchanger. The condensed refrigerant evaporates in the first outdoor heat exchanger and / or the second outdoor heat exchanger, and part of the compressed refrigerant is condensed in the indoor heat exchanger. The first on-off valve is opened;

[0089] Full heat storage: In full heat storage mode, the indoor heat exchanger is closed, the refrigerant is compressed in the compressor, the compressed refrigerant is condensed in the accumulator, the accumulator stores heat, the condensed refrigerant evaporates in the first outdoor heat exchanger and / or the second outdoor heat exchanger, and the first on-off valve is opened;

[0090] Thermal storage and complete heating: In the thermal storage and complete heating mode, the refrigerant is compressed in the compressor, the compressed refrigerant is condensed in the accumulator and the indoor heat exchanger, and the condensed refrigerant is evaporated in the first outdoor heat exchanger and / or the second outdoor heat exchanger, and the first switch valve is opened;

[0091] Thermal storage and simultaneous complete cooling with outdoor unit evaporation: In the thermal storage and simultaneous complete cooling and outdoor unit evaporation mode, the refrigerant is compressed in the compressor, the compressed refrigerant is condensed in the accumulator, the accumulator stores heat, and the partially condensed refrigerant evaporates in the indoor heat exchanger, and the partially condensed refrigerant evaporates in the first outdoor heat exchanger and / or the second outdoor heat exchanger, and the first on-off valve is opened;

[0092] Thermal storage and simultaneous complete cooling with outdoor unit condensing: In the thermal storage and simultaneous complete cooling with outdoor unit condensing mode, the refrigerant is compressed in the compressor, the partially compressed refrigerant is condensed in the first outdoor heat exchanger and / or the second outdoor heat exchanger, the partially compressed refrigerant is condensed in the accumulator, the condensed refrigerant is evaporated in the indoor heat exchanger, and the first on-off valve is opened;

[0093] Heat storage and main body heating: In the heat storage and main body heating mode, the refrigerant is compressed in the compressor, partially compressed refrigerant is condensed in the indoor heat exchanger, the indoor heat exchanger generates heat, partially compressed refrigerant is condensed in the accumulator, the accumulator stores heat, partially condensed refrigerant is evaporated in the first outdoor heat exchanger and / or the second outdoor heat exchanger, and partially condensed refrigerant is evaporated in the indoor heat exchanger, and the first on-off valve is opened;

[0094] Thermal storage with main body cooling and outdoor unit condensing: In the thermal storage with main body cooling and outdoor unit condensing mode, the refrigerant is compressed in the compressor, part of the compressed refrigerant is condensed in the first outdoor heat exchanger and / or the second outdoor heat exchanger, part of the compressed refrigerant is condensed in the accumulator, the condensed refrigerant evaporates in the indoor heat exchanger, part of the compressed refrigerant evaporates in the indoor heat exchanger, the amount of refrigerant evaporation in the outdoor unit is less than the amount of refrigerant condensation, the amount of refrigerant evaporation in the indoor heat exchanger is greater than the amount of refrigerant condensation, and the first on-off valve is opened;

[0095] Thermal storage with main body cooling and outdoor unit evaporation: In the thermal storage with main body cooling and outdoor unit evaporation mode, the refrigerant is compressed in the compressor, part of the compressed refrigerant is condensed in the first outdoor heat exchanger and / or the second outdoor heat exchanger, part of the compressed refrigerant is condensed in the accumulator, the condensed refrigerant evaporates in the indoor heat exchanger, part of the compressed refrigerant evaporates in the indoor heat exchanger, the amount of refrigerant evaporation in the outdoor unit is greater than the amount of refrigerant condensation, the amount of refrigerant evaporation in the indoor heat exchanger is greater than the amount of refrigerant condensation, and the first on-off valve is opened;

[0096] Mixed heat release and simultaneous complete heating: In the mixed heat release and simultaneous complete heating mode, the refrigerant is compressed in the compressor, the compressed refrigerant is condensed in the indoor heat exchanger, and part of the condensed refrigerant evaporates in the accumulator. The accumulator releases heat, and part of the condensed refrigerant evaporates in the first outdoor heat exchanger and / or the second outdoor heat exchanger, and the first on-off valve is opened;

[0097] Mixed heat release and main heating: In the mixed heat release and main heating mode, the refrigerant is compressed in the compressor, condensed in the indoor heat exchanger, and partially condensed refrigerant evaporates in the accumulator. The accumulator releases heat, and partially condensed refrigerant evaporates in the first outdoor heat exchanger and / or the second outdoor heat exchanger, and the first on-off valve is opened;

[0098] Independent heat release and simultaneous full heating: In the independent heat release and simultaneous full heating mode, the first outdoor heat exchanger and the second outdoor heat exchanger are closed, the refrigerant is compressed in the compressor, the compressed refrigerant is condensed in the indoor heat exchanger, the condensed refrigerant evaporates in the accumulator, the accumulator releases heat, and the first switch valve is opened;

[0099] Independent heat release and simultaneous main heating: In the independent heat release and simultaneous main heating mode, the first outdoor heat exchanger and the second outdoor heat exchanger are closed, the refrigerant is compressed in the compressor, the compressed refrigerant is condensed in the indoor heat exchanger, and part of the condensed refrigerant evaporates in the accumulator. The accumulator releases heat, and part of the condensed refrigerant evaporates in the indoor heat exchanger. The first switch valve is opened

[0100] Among them, full heating means that multiple indoor heat exchangers are used as condensers for heating, and full cooling means that multiple indoor heat exchangers are used as evaporators for cooling.

[0101] When the main unit is heating, the condensation amount of the refrigerant in the indoor heat exchanger is greater than the evaporation amount. When the main unit is cooling, the condensation amount of the refrigerant in the indoor heat exchanger is less than the evaporation amount. When the main unit is heating, the indoor heat exchanger is only used to condense the refrigerant. When the main unit is cooling, the indoor heat exchanger is only used to evaporate the refrigerant.

[0102] In some embodiments, the refrigerant circulation system operates in at least one of the following operating modes:

[0103] Non-zoned discontinuous heating and defrosting: In the non-zoned discontinuous heating and defrosting mode, the indoor heat exchanger is closed, the refrigerant is compressed in the compressor, and the compressed refrigerant is condensed in the first and second outdoor heat exchangers to defrost the first and second outdoor heat exchangers. The condensed refrigerant evaporates in the accumulator, the accumulator releases heat, and the first on-off valve in the first pipeline section connected in parallel with the accumulator is closed;

[0104] Partitioned discontinuous heating and defrosting: In the partitioned discontinuous heating and defrosting mode, one of the first and second outdoor heat exchangers is used as a condenser to achieve defrosting, and the other is used as an evaporator. The refrigerant compressed by the compressor is condensed in one of the first and second outdoor heat exchangers, and the condensed refrigerant evaporates in the accumulator, which releases heat and the first on-off valve is closed.

[0105] Non-zoned continuous heating, defrosting and full heating: In the non-zoned continuous heating, defrosting and full heating mode, the refrigerant is compressed in the compressor, and the partially compressed refrigerant is condensed in the first outdoor heat exchanger and / or the second outdoor heat exchanger. The partially compressed refrigerant is condensed in the indoor heat exchanger and evaporated in the accumulator. The accumulator releases heat and the first on-off valve opens.

[0106] Non-zoned continuous heating and defrosting with main heating: In the non-zoned continuous heating and defrosting with main heating mode, the refrigerant is compressed in the compressor, partially compressed refrigerant is condensed in the first outdoor heat exchanger and / or the second outdoor heat exchanger, partially compressed refrigerant is condensed in the indoor heat exchanger, partially condensed refrigerant is evaporated in the accumulator, the accumulator releases heat, and partially condensed refrigerant is evaporated in the indoor heat exchanger. The evaporation amount of refrigerant in the indoor heat exchanger is less than the condensation amount, and the first on-off valve is opened;

[0107] Non-zoned continuous heating and defrosting with main cooling: In the non-zoned continuous heating and defrosting with main cooling mode, the refrigerant is compressed in the compressor, partially compressed refrigerant is condensed in the first outdoor heat exchanger and / or the second outdoor heat exchanger, partially compressed refrigerant is condensed in the indoor heat exchanger, partially condensed refrigerant evaporates in the accumulator, the accumulator releases heat, and partially condensed refrigerant evaporates in the indoor heat exchanger. The evaporation amount of refrigerant in the indoor heat exchanger is greater than the condensation amount, and the first on-off valve is opened;

[0108] Partitioned continuous heating and defrosting with full heating and outdoor unit condensing: In the partitioned continuous heating and defrosting with full heating and outdoor unit condensing mode, the refrigerant is compressed in the compressor, the partially compressed refrigerant is condensed in one of the first outdoor heat exchanger and the second outdoor heat exchanger, the partially compressed refrigerant is condensed in the indoor heat exchanger, the condensed refrigerant evaporates in the accumulator and the other of the first outdoor heat exchanger and the second outdoor heat exchanger, the accumulator releases heat, and the first on-off valve opens;

[0109] Partitioned continuous heating and defrosting with condensation of the main heating outdoor unit: In the partitioned continuous heating and defrosting with condensation of the main heating outdoor unit mode, the refrigerant is compressed in the compressor, and the partially compressed refrigerant is condensed in one of the first outdoor heat exchanger and the second outdoor heat exchanger. The partially compressed refrigerant is condensed in the indoor heat exchanger, and the condensed refrigerant evaporates in the outdoor heat exchanger, the accumulator, and the other of the first outdoor heat exchanger and the second outdoor heat exchanger. The accumulator releases heat, the evaporation amount of the refrigerant in the indoor heat exchanger is less than the condensation amount, and the first on-off valve is opened;

[0110] Partitioned continuous heating and defrosting with condensation of the main refrigeration outdoor unit: In the partitioned continuous heating and defrosting with condensation of the main refrigeration outdoor unit mode, the refrigerant is compressed in the compressor, and the partially compressed refrigerant is condensed in one of the first outdoor heat exchanger and the second outdoor heat exchanger. The partially compressed refrigerant is condensed in the indoor heat exchanger, and the condensed refrigerant evaporates in the outdoor heat exchanger, the accumulator, and the other of the first outdoor heat exchanger and the second outdoor heat exchanger. The accumulator releases heat, the evaporation amount of the refrigerant in the indoor heat exchanger is greater than the condensation amount, and the first on-off valve opens;

[0111] Partitioned continuous heating and defrosting with full heating and outdoor unit evaporation: In the partitioned continuous heating and defrosting with full heating and outdoor unit evaporation mode, the refrigerant is compressed in the compressor, the partially compressed refrigerant is condensed in one of the first outdoor heat exchanger and the second outdoor heat exchanger, the partially compressed refrigerant is condensed in the indoor heat exchanger, the condensed refrigerant is evaporated in the accumulator and the other of the first outdoor heat exchanger and the second outdoor heat exchanger, the accumulator releases heat, and the first on-off valve is opened;

[0112] Partitioned continuous heating and defrosting with evaporation of the main heating outdoor unit: In the partitioned continuous heating and defrosting with evaporation of the main heating outdoor unit mode, the refrigerant is compressed in the compressor, and the partially compressed refrigerant is condensed in one of the first outdoor heat exchanger and the second outdoor heat exchanger. The partially compressed refrigerant is condensed in the indoor heat exchanger, and the condensed refrigerant is evaporated in the outdoor heat exchanger, the accumulator, and the other of the first outdoor heat exchanger and the second outdoor heat exchanger. The accumulator releases heat, the evaporation amount of the refrigerant in the indoor heat exchanger is less than the condensation amount, and the first on-off valve is opened;

[0113] Partitioned continuous heating and defrosting with evaporation of the main refrigeration outdoor unit: In the partitioned continuous heating and defrosting with evaporation of the main refrigeration outdoor unit mode, the refrigerant is compressed in the compressor, and the partially compressed refrigerant is condensed in one of the first outdoor heat exchanger and the second outdoor heat exchanger, and the partially compressed refrigerant is condensed in the indoor heat exchanger. The condensed refrigerant evaporates in the outdoor heat exchanger, the accumulator, and the other of the first outdoor heat exchanger and the second outdoor heat exchanger. The accumulator releases heat, and the evaporation amount of the refrigerant in the indoor heat exchanger is greater than the condensation amount. The first switch valve is opened.

[0114] Among them, full heating means that multiple indoor heat exchangers are used as condensers for heating, and full cooling means that multiple indoor heat exchangers are used as evaporators for cooling.

[0115] When the main unit is heating, the condensation amount of the refrigerant in the indoor heat exchanger is greater than the evaporation amount. When the main unit is cooling, the condensation amount of the refrigerant in the indoor heat exchanger is less than the evaporation amount. When the main unit is heating, the indoor heat exchanger is only used to condense the refrigerant. When the main unit is cooling, the indoor heat exchanger is only used to evaporate the refrigerant.

[0116] In some embodiments, the refrigerant circulation system operates in at least one of the following operating modes:

[0117] Conventional heat recovery: In conventional heat recovery mode, the first and second outdoor heat exchangers are shut down, the accumulator is shut down, the refrigerant is compressed in the compressor, the compressed refrigerant is condensed in some indoor heat exchangers, and the condensed refrigerant is evaporated in another part of the indoor heat exchanger. The first on-off valve in the first section of the pipeline in parallel with the accumulator is closed;

[0118] Cold storage and heat recovery: In cold storage and heat recovery mode, the first and second outdoor heat exchangers are shut down, the refrigerant is compressed in the compressor, condensed in some indoor heat exchangers, and evaporated in other indoor heat exchangers and accumulators. The accumulators store cold energy, and the evaporation amount of the refrigerant in the indoor heat exchangers is less than the condensation amount, so the first on-off valve is closed.

[0119] Heat storage and heat recovery: In the heat storage and heat recovery mode, the first outdoor heat exchanger and the second outdoor heat exchanger are shut down, the refrigerant is compressed in the compressor, and the compressed refrigerant is condensed in the accumulator and part of the indoor heat exchanger. The accumulator stores heat, and the condensed refrigerant evaporates in another part of the indoor heat exchanger. The evaporation amount of the refrigerant in the indoor heat exchanger is greater than the condensation amount, and the first switch valve is closed;

[0120] Cooling and heat recovery: In the cooling and heat recovery mode, the first outdoor heat exchanger and the second outdoor heat exchanger are shut down, the refrigerant is compressed in the compressor, and the compressed refrigerant is condensed in the accumulator and part of the indoor heat exchanger. The accumulator releases the cooling capacity, and the condensed refrigerant evaporates in another part of the indoor heat exchanger. The evaporation amount of the refrigerant in the indoor heat exchanger is greater than the condensation amount, and the first switch valve is closed;

[0121] Heat release and heat recovery at the same time: In the heat release and heat recovery mode, the first outdoor heat exchanger and the second outdoor heat exchanger are shut down, the refrigerant is compressed in the compressor, the compressed refrigerant is condensed in part of the indoor heat exchangers, the condensed refrigerant evaporates in another part of the indoor heat exchanger and the accumulator, the accumulator releases heat, the evaporation amount of the refrigerant in the indoor heat exchanger is less than the condensation amount, and the first switch valve is closed.

[0122] By applying the technical solution of the present application, in this embodiment, the refrigerant system can have multiple working modes by controlling the states of the first control valve, the second control valve, and the first refrigerant inlet and outlet and the second refrigerant inlet and outlet of the accumulator.

[0123] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0124] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0125] Figure 1 A schematic structural diagram of a refrigerant circulation system according to an embodiment of the present invention is shown;

[0126] Figure 2 A schematic diagram showing a first operating mode of an outdoor unit of a refrigerant circulation system according to an embodiment of the present invention;

[0127] Figure 3 A schematic diagram showing a second operating mode of an outdoor unit of a refrigerant circulation system according to an embodiment of the present invention;

[0128] Figure 4 A schematic diagram showing a third operating mode of the outdoor unit of the refrigerant circulation system according to an embodiment of the present invention;

[0129] Figure 5 A schematic diagram showing a fourth operating mode of the outdoor unit of the refrigerant circulation system according to an embodiment of the present invention;

[0130] Figure 6 A schematic diagram showing a fifth operating mode of the outdoor unit of the refrigerant circulation system according to an embodiment of the present invention;

[0131] Figure 7 A schematic diagram showing a sixth operating mode of the outdoor unit of the refrigerant circulation system according to an embodiment of the present invention;

[0132] Figure 8 A schematic diagram showing a seventh operating mode of the outdoor unit of the refrigerant circulation system according to an embodiment of the present invention;

[0133] Figure 9 A schematic diagram showing an eighth operating mode of the outdoor unit of the refrigerant circulation system according to an embodiment of the present invention;

[0134] Figure 10 A schematic diagram showing a ninth operating mode of the outdoor unit of the refrigerant circulation system according to an embodiment of the present invention;

[0135] Figure 11 A schematic diagram showing a first operating mode of an accumulator of a refrigerant circulation system according to an embodiment of the present invention;

[0136] Figure 12 A schematic diagram showing a second operating mode of the accumulator of the refrigerant circulation system according to an embodiment of the present invention;

[0137] Figure 13 A schematic diagram showing a third operating mode of the accumulator of the refrigerant circulation system according to an embodiment of the present invention;

[0138] Figure 14 A schematic diagram showing a first operating mode of an indoor unit of a refrigerant circulation system according to an embodiment of the present invention;

[0139] Figure 15 A schematic diagram showing a second operating mode of an indoor unit of a refrigerant circulation system according to an embodiment of the present invention;

[0140] Figure 16 A schematic structural diagram of a refrigerant circulation system according to another optional embodiment of the present invention is shown;

[0141] Figure 17 A schematic structural diagram of a refrigerant circulation system according to another optional embodiment of the present invention is shown;

[0142] Figure 18 Shown Figure 17 A flow diagram showing the working state of the storage tank of the refrigerant circulation system;

[0143] Figure 19 Shown Figure 17 A flow diagram of the refrigerant circulation system shown in FIG. 1 , wherein the storage tank releases the refrigerant in the working state;

[0144] Figure 20 A schematic structural diagram of a refrigerant circulation system according to another optional embodiment of the present invention is shown;

[0145] Figure 21 Shown Figure 20 A flow diagram showing the working state of the storage tank of the refrigerant circulation system; and

[0146] Figure 22 Shown Figure 20 The flow diagram of the refrigerant circulation system's liquid storage tank in the working state of releasing refrigerant is shown.

[0147] In the picture:

[0148] 1. Outdoor unit; 101. Compressor; 102. First control valve; 103. Third control valve; 104. Second control valve; 105. First outdoor heat exchanger; 106. Second throttling component; 107. Second outdoor heat exchanger; 108. Third throttling component; 109. Subcooler throttling component; 110. Subcooler; 111. Gas-liquid separator; 2. Energy storage device; 201. Energy storage device; 202. Third connecting pipe; 203. Fourth connecting pipe; 204. Junction; 205. Fifth connecting pipe; 2 06. First throttling component; 207. First connecting pipeline; 208. Second switching valve; 209. First one-way valve; 210. Third switching valve; 211. First switching valve; 213. Second connecting pipeline; 214. Liquid separation device; 3. First pipeline; 4. Second pipeline; 5. Third pipeline; 601. Indoor unit subcooler; 602. Cooling control valve; 603. Heating control valve; 604. First indoor unit pipeline; 605. Second indoor unit pipeline; 7. Indoor heat exchanger; 701. Indoor unit throttling component. DETAILED DESCRIPTION

[0149] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0150] like Figure 1 As shown, the refrigerant circulation system of this embodiment includes a compressor 101, a first control valve 102, a first outdoor heat exchanger 105, a first pipeline 3, a second control valve 104, a first pipeline 3, a second pipeline 4, a third pipeline 5, an accumulator 201 and an indoor heat exchanger 7.

[0151] The compressor 101 includes an intake port for introducing the refrigerant to be compressed and an exhaust port for discharging the compressed refrigerant; the first control valve 102 includes an inlet connected to the exhaust port of the compressor 101, a return port connected to the intake port of the compressor 101, and a working port that can be selectively connected to one of the inlet and the return port; the first outdoor heat exchanger 105 is connected to the working port of the first control valve 102; the first pipeline 3 is connected to the first outdoor heat exchanger 105.

[0152] The second control valve 104 includes an inlet connected to the exhaust port of the compressor 101 and a working port that can be opened and closed with the inlet; the second pipeline 4 is connected to the working port of the second control valve 104; the third pipeline 5 is connected to the intake port of the compressor 101; and the first throttling component 206 is connected to the first pipeline 3.

[0153] The accumulator 201 includes a first refrigerant inlet and outlet 201a and a second refrigerant inlet and outlet 201b. The first refrigerant inlet and outlet 201a of the accumulator 201 can be switched between a first state and a second state. In the first state, refrigerant flows between the first refrigerant inlet and outlet 201a of the accumulator 201 and the first throttling component 206. In the second state, refrigerant flows between the first refrigerant inlet and outlet 201a of the accumulator 201 and the first pipeline 3. The second refrigerant inlet and outlet 201b of the accumulator 201 can be switched between a third state and a fourth state. In the third state, refrigerant flows between the second refrigerant inlet and outlet 201b of the accumulator 201 and the second pipeline 4 or the exhaust port of the compressor 101. In the fourth state, refrigerant flows between the second refrigerant inlet and outlet 201b of the accumulator 201 and the third pipeline 5.

[0154] The indoor heat exchanger 7 includes a first refrigerant inlet and a second refrigerant inlet. The first refrigerant inlet and the second refrigerant inlet of the indoor heat exchanger 7 are connected to the first pipeline 3, and the second refrigerant inlet and the second refrigerant inlet of the indoor heat exchanger 7 can be selectively connected to one of the second pipeline 4 and the third pipeline 5.

[0155] In this embodiment, the refrigerant system can have multiple operating modes by controlling the states of the first control valve 102, the second control valve 104, and the first refrigerant inlet and outlet 201a and the second refrigerant inlet and outlet 201b of the accumulator 201. For example:

[0156] In cooling capacity saving mode, refer to Figure 11 As shown, the inlet and working port of the first control valve 102 are controlled to be connected, the first refrigerant inlet and outlet 201a of the accumulator 201 is in the first state to communicate with the first throttling component 206, and the second refrigerant inlet and outlet 201b of the accumulator 201 is in the fourth state to communicate with the third pipeline 5.

[0157] In the heat storage mode, refer to Figure 13 As shown, the return port of the first control valve 102 is controlled to be connected to the working port, the first refrigerant inlet 201a of the accumulator 201 is in the second state to communicate with the first pipeline 3, and the second refrigerant inlet 201b of the accumulator 201 is in the third state to communicate with the second pipeline 4 or the exhaust port of the compressor 101;

[0158] In the heat release mode, the second refrigerant inlet 201b of the accumulator 201 is in the fourth state to communicate with the third pipeline 5, and the first refrigerant inlet 201a of the accumulator 201 is in the first state to communicate with the first throttling component 206;

[0159] In the cooling capacity release mode, the first refrigerant inlet 201a of the accumulator 201 is in the second state to communicate with the first pipeline 3, and the second refrigerant inlet 201b of the accumulator 201 is in the third state to communicate with the second pipeline 4 or the exhaust port of the compressor 101.

[0160] The second refrigerant inlet 201b of the accumulator 201 also has a fifth state in which refrigerant flows between the first pipeline 3 . The second refrigerant inlet 201b of the accumulator 201 can be switched among the third state, the fourth state and the fifth state.

[0161] The refrigerant circulation system also includes a third control valve 103 and a second outdoor heat exchanger. The third control valve 103 includes an inlet connected to the exhaust port of the compressor 101, a return port connected to the intake port of the compressor 101, and a working port. The working port can be selectively connected to either the inlet or the return port. One end of the second outdoor heat exchanger 107 is connected to the working port of the third control valve 103, and the other end is connected to the first pipeline 3.

[0162] The refrigerant circulation system further includes a second throttle component 106 and a third throttle component 108. The second throttle component 106 includes a first inlet and outlet communicating with the first outdoor heat exchanger 105 and a second inlet and outlet communicating with the first pipeline 3. The third throttle component 108 includes a first inlet and outlet communicating with the second outdoor heat exchanger 107 and a second inlet and outlet communicating with the first pipeline 3. The second inlet and outlet of the third throttle component 108 communicate with the second inlet and outlet of the second throttle component 106.

[0163] The second control valve 104 further includes a return port communicating with the suction port of the compressor 101 . The working port of the second control valve 104 can be selectively communicated with one of the inlet of the second control valve 104 and the return port of the second control valve 104 .

[0164] The refrigerant circulation system further includes a first communication line 207 and a second communication line 213. One end of the first communication line 207 is connected to the first refrigerant inlet 201a, and the other end is connected to the first pipeline 3. The first throttling component 206 is provided in the first communication line 207.

[0165] One end of the second connecting pipe 213 is connected to the first refrigerant inlet and outlet 201a, and the other end is connected to the first pipe 3. The connection between the second connecting pipe 213 and the first pipe 3 is closer to the indoor heat exchanger 7 in the flow direction of the first pipe 3 than the connection between the first connecting pipe 207 and the first pipe 3.

[0166] The refrigerant circulation system also includes a first on-off valve 211 and a first check valve 209. The first on-off valve 211 is located in the first pipeline 3, between the connection between the first connecting pipeline 207 and the first pipeline 3, and the connection between the second connecting pipeline 213 and the first pipeline 3. The first check valve 209 is located in the second connecting pipeline 213, with its inlet connected to the first refrigerant inlet / outlet 201a of the accumulator 201. The first on-off valve 211 is used to control the on / off of a section of the first pipeline 3 that bypasses the accumulator 201.

[0167] The refrigerant circulation system also includes a third connecting line 202 and a fourth connecting line 203. One end of the third connecting line 202 is connected to the exhaust port of the compressor 101 or the second line 4, and the other end is connected to the second refrigerant inlet 201b of the accumulator 201. The fourth connecting line 203 has one end connected to the second refrigerant inlet 201b of the accumulator 201 and the other end is connected to the third line 5.

[0168] The refrigerant circulation system further includes a second on-off valve 208 and a third on-off valve 210 . The second on-off valve 208 is disposed in the third connecting pipe 202 ; the third on-off valve 210 is disposed in the fourth connecting pipe 203 .

[0169] The other end of the third connecting pipe 202 is connected to the first connecting pipe 207 connecting the first refrigerant inlet and outlet 201a and the first pipe 3. The connection between the other end of the third connecting pipe 202 and the first connecting pipe 207 is located between the first pipe 3 and the first throttling component 206 in the flow direction of the first connecting pipe 207. The refrigerant circulation system also includes a fifth connecting pipe 205. One end of the fifth connecting pipe 205 is connected to the first connecting pipe 207, and the other end is connected to the second refrigerant inlet and outlet 201b of the accumulator 201.

[0170] The connection point between the fifth communicating line 205 and the first communicating line 207 is located between the first line 3 and the first throttle component 206 in the flow direction of the first communicating line 207 .

[0171] The refrigerant circulation system also includes a fourth on-off valve 212 and a second one-way valve. The fourth on-off valve 212 is disposed in the fifth connecting line 205. The second one-way valve is disposed in the first connecting line 207 and is located between the first line 3 and the fifth connecting line 205 in the flow direction of the first connecting line 207.

[0172] The refrigerant circulation system also includes a cooling control valve 602 and a heating control valve 603. One end of the cooling control valve 602 is connected to the second refrigerant inlet and outlet of the indoor heat exchanger, and the other end is connected to the third pipeline 5. The heating control valve 603 is connected to the second refrigerant inlet and outlet of the indoor heat exchanger, and the other end is connected to the second pipeline 4.

[0173] The refrigerant circulation system further includes a first indoor unit pipeline 604 , one end of which is connected to the first refrigerant inlet and outlet of the indoor heat exchanger 7 , and the other end of which is connected to the first pipeline 3 .

[0174] In some embodiments, the refrigerant circulation system further includes an indoor unit supercooler 601 and an indoor unit throttling component 701 provided in the first indoor unit pipeline 604 .

[0175] The refrigerant circulation system further includes a second indoor unit pipeline 605 , one end of which is connected to the second refrigerant inlet and outlet of the indoor heat exchanger 7 , and the other end of which is connected to the cooling control valve 602 and the heating control valve 603 .

[0176] like Figure 1 As shown, the refrigerant circulation system of this embodiment also includes a subcooler 110 connected to the first outdoor heat exchanger 105 and the second outdoor heat exchanger 107 respectively, and a subcooler throttling component 109 connected between the subcooler 110 and the first outdoor heat exchanger 105 and the second outdoor heat exchanger 107.

[0177] like Figure 16 As shown, in some embodiments, when the accumulator 201 is in the third state, refrigerant flows between the second refrigerant inlet 201b of the accumulator 201 and the exhaust port of the compressor 101 to introduce the refrigerant compressed by the compressor 101.

[0178] like Figures 17 to 19 As shown, in some embodiments, the refrigerant circulation system also includes a liquid storage tank, which controls the amount of refrigerant in different operating modes by storing and releasing the refrigerant in the liquid storage tank, so that the amount of refrigerant circulating in the system is consistent with the refrigerant demand in different operating modes, thereby achieving the best heat exchange effect.

[0179] The liquid storage tank 220 has three interfaces. The first inlet 220a of the liquid storage tank 220 is connected to the first pipeline 3 via a liquid inlet valve 221. The second inlet 220b of the liquid storage tank 220 is connected to the third connecting pipeline 202 via a pressurizing valve 222 and to the third pipeline 5 via a capillary tube 225 and a gas balance valve 224. The outlet 220c of the liquid storage tank 220 is connected to the third pipeline 5 via a capillary tube 225 and a liquid drain valve 223.

[0180] The liquid storage tank 220 has three states: not working, storing refrigerant and releasing refrigerant. These three states can be used in different system modes such as conventional cooling and full cold storage.

[0181] 1. When not working, the liquid inlet valve 221, the pressure valve 222, the liquid discharge valve 223 and the gas balance valve 224 are all closed.

[0182] 2. When it is determined that the current operating mode requires refrigerant storage, the liquid inlet valve 221 and the gas balance valve 224 are opened, and the pressurizing valve 222 and the liquid discharge valve 223 are closed. The gas balance valve 224 is opened, placing the pressure in the liquid storage tank 220 at a low pressure. The liquid inlet valve 221 is opened, placing the refrigerant inlet pipe of the liquid storage tank 220 at a medium pressure. The refrigerant enters the refrigerant tank 220 under the action of the pressure difference.

[0183] 3. When it is determined that the current operating mode requires the refrigerant tank to be activated to release refrigerant, the liquid inlet valve 221 and the gas balance valve 224 are closed, and the pressurizing valve 222 and the drain valve 223 are opened. The drain valve 223 is opened, placing the outlet of the liquid storage tank 220 in a low-pressure state, and the pressurizing valve 222 is opened, placing the pressure in the liquid storage tank 220 in a high-pressure state. The refrigerant in the tank is discharged from the tank under the action of gravity and pressure difference and enters the pipeline circulation.

[0184] Combine Figures 20 to 22 As shown, in other embodiments, the liquid storage tank 220 only includes an inlet 220a and an outlet 220c. The inlet 220a of the liquid storage tank 220 is connected to the first pipeline 3 through a gas balance valve 224, and the outlet 220c of the liquid storage tank 220 is connected to the third pipeline 5 through a drain valve 223 and a capillary tube 225.

[0185] The liquid storage tank 220 has three states: not working, storing refrigerant and releasing refrigerant. These three states can be used in different system modes such as conventional cooling and full cold storage.

[0186] 1. When not working, the drain valve 223 and the gas balance valve 224 are both closed.

[0187] 2. When it is determined that the current operating mode requires the start of refrigerant storage, the drain valve 223 and the gas balance valve 224 are both opened, and the refrigerant enters the refrigerant tank 220 under the action of the pressure difference.

[0188] 3. When it is determined that the current operating mode requires the refrigerant tank to be started to release refrigerant, the gas balance valve 224 is closed and the drain valve 223 is opened. The refrigerant inside the tank is discharged from the tank under the action of gravity and pressure difference and enters the pipeline circulation.

[0189] According to another aspect of the present application, an air-conditioning device is provided, which includes the above-mentioned refrigerant circulation system.

[0190] According to another aspect of the present application, a control method for the above-mentioned refrigerant circulation system is also provided, the control method comprising controlling the refrigerant circulation system to operate in at least one of a cold storage mode, a heat storage mode, a heat release mode, and a heat release mode, wherein:

[0191] In the cold storage mode, the inlet and the working port of the first control valve 102 are controlled to be connected, the first refrigerant inlet 201a of the accumulator 201 is in the first state to communicate with the first throttle component 206, and the second refrigerant inlet 201b of the accumulator 201 is in the fourth state to communicate with the third pipeline 5;

[0192] In the heat storage mode, the return port of the first control valve 102 is controlled to be connected to the working port, the first refrigerant inlet 201a of the accumulator 201 is in the second state to communicate with the first pipeline 3, and the second refrigerant inlet 201b of the accumulator 201 is in the third state to communicate with the second pipeline 4 or the exhaust port of the compressor 101;

[0193] In the heat release mode, the second refrigerant inlet 201b of the accumulator 201 is in the fourth state to communicate with the third pipeline 5, and the first refrigerant inlet 201a of the accumulator 201 is in the first state to communicate with the first throttling component 206;

[0194] In the cooling capacity release mode, the first refrigerant inlet 201a of the accumulator 201 is in the second state to communicate with the first pipeline 3, and the second refrigerant inlet 201b of the accumulator 201 is in the third state to communicate with the second pipeline 4 or the exhaust port of the compressor 101.

[0195] The control method also includes: during the period when the power supply system has high electricity prices, the refrigerant circulation system is in a cooling mode or a heat release mode; during the period when the power supply system has low electricity prices, the refrigerant circulation system is in a cooling mode or a heat storage mode.

[0196] In some embodiments, the control method further includes:

[0197] A plurality of indoor heat exchangers 7 are provided in parallel; and

[0198] A second outdoor heat exchanger 107 and a third control valve 103 are set in parallel with the first outdoor heat exchanger 105. The third control valve 103 includes an inlet connected to the exhaust port of the compressor 101, a return port connected to the intake port of the compressor 101, and a working port. The working port can be selectively connected to one of the inlet and the return port.

[0199] The outdoor unit 1 includes a first outdoor heat exchanger 105 and a second outdoor heat exchanger 107 arranged side by side with the second outdoor heat exchanger 107. In some embodiments, the first outdoor heat exchanger 105 and the second outdoor heat exchanger 107 are arranged side by side in a vertical direction, with one of the first outdoor heat exchanger 105 and the second outdoor heat exchanger 107 positioned above the other. The first outdoor heat exchanger 105 and the second outdoor heat exchanger 107 can function as both a condenser and an evaporator, or one can function as a condenser and the other as an evaporator.

[0200] The control method includes controlling the outdoor unit 1 of the refrigerant circulation system to operate in at least one of the following multiple working modes:

[0201] Complete condensation: Figure 2 As shown, the inlet and working port of the first control valve 102 are connected, the inlet and working port of the second control valve 104 are not connected, the inlet and working port of the third control valve 103 are connected, the first outdoor heat exchanger 105 and the second outdoor heat exchanger 107 both serve as condensers, and the refrigerant condenses in the first outdoor heat exchanger 105 and the second outdoor heat exchanger 107.

[0202] At this time, the first outdoor heat exchanger 105 and the second outdoor heat exchanger 107 function as condensers. The refrigerant discharged from the compressor 101 enters the first outdoor heat exchanger 105 and the second outdoor heat exchanger 107 through the first control valve 102 and the third control valve 103, respectively, for condensation. The condensed refrigerant then enters the first pipeline 3. The evaporated refrigerant returns to the gas-liquid separator 111 through the third pipeline 5 before entering the intake port of the compressor 101.

[0203] Main condensation, such as Figure 3 As shown, the inlet and working port of the first control valve 102 are connected, the inlet and working port of the second control valve 104 are connected to transport part of the refrigerant to the indoor heat exchanger 7 and / or accumulator 201 for condensation, and the inlet and working port of the third control valve 103 are connected.

[0204] At this point, both the first outdoor heat exchanger 105 and the second outdoor heat exchanger 107 function as condensers, while the compressor 101 supplies a portion of the refrigerant to the indoor heat exchanger 7 and / or accumulator 201, which are undergoing condensation. A portion of the refrigerant discharged from the compressor 101 passes through the first control valve 102 and the second control valve 103 and enters the first and second outdoor heat exchangers 105 and 107 for condensation. The condensed refrigerant then enters the first pipeline 3. The evaporated refrigerant returns to the gas-liquid separator 111 via the third pipeline and then enters the intake port of the compressor 101. The remaining portion of the refrigerant discharged from the compressor 101 passes through the second control valve 104 and enters the second pipeline 4.

[0205] Complete evaporation, such as Figure 4 As shown, the return port and the working port of the first control valve 102 are connected, the inlet and the working port of the second control valve 104 are connected, and the return port and the working port of the third control valve 103 are connected. The refrigerant condenses in the indoor heat exchanger 7 and / or the accumulator 201, and the condensed refrigerant is transported to the first outdoor heat exchanger 105 and the second outdoor heat exchanger 107 for evaporation.

[0206] At this point, both first outdoor heat exchanger 105 and second outdoor heat exchanger 107 function as evaporators. Refrigerant discharged from compressor 101 enters second pipeline 4 through second control valve 104. Intermediate-pressure refrigerant enters first and second outdoor heat exchangers 105, 107 through first pipeline 3 for evaporation. It then passes through first and third control valves 102, 103, and returns to gas-liquid separator 111 before entering the intake port of compressor 101.

[0207] Main body evaporation: Figure 5 As shown, the return port and the working port of the first control valve 102 are connected, and the inlet and the working port of the second control valve 104 are connected to transport part of the refrigerant to the indoor heat exchanger 7 and / or the accumulator 201 for condensation. The return port and the working port of the third control valve 103 are connected, and part of the refrigerant condenses in the indoor heat exchanger 7 and / or the accumulator 201. The condensed refrigerant is transported to the first outdoor heat exchanger 105 and the second outdoor heat exchanger 107 for evaporation. Part of the refrigerant evaporates in the indoor heat exchanger 7 and / or the accumulator 201, and the evaporated refrigerant is transported to the suction port of the compressor 101 through the third pipeline 5.

[0208] At this time, the first outdoor heat exchanger 105 and the second outdoor heat exchanger 107 both function as evaporators, receiving refrigerant return air from the evaporating indoor heat exchanger 7 and / or accumulator 201. The refrigerant discharged from the compressor 101 enters the second pipeline 4 through the second control valve 104. The medium-pressure refrigerant enters the first and second outdoor heat exchangers 105, 107 through the first pipeline 3, where it evaporates. After passing through the first and third control valves 102, 103, it returns to the gas-liquid separator 111 and then enters the intake port of the compressor 101. The refrigerant discharged from the indoor unit 7 and / or accumulator 201, which functions as an evaporator, returns to the gas-liquid separator 111 through the third pipeline 5 and then enters the intake port of the compressor 101.

[0209] Shutdown of the outdoor unit's heat exchanger: Figure 6 As shown, the inlet and the working port of the second control valve 104 are connected, and the refrigerant is transported to one of the indoor heat exchanger 7 and / or the accumulator 201 for condensation, and is evaporated in the other and then transported to the suction port of the compressor 101 through the third pipeline 5.

[0210] At this time, the first outdoor heat exchanger 105 and the second outdoor heat exchanger 107 are not operating. The refrigerant discharged from the compressor 101 passes through the second control valve 104 and the second pipeline 4 and enters the accumulator 201 and / or the indoor heat exchanger 7 serving as the condenser for condensation. The refrigerant discharged from the accumulator 201 and / or the indoor heat exchanger 7 serving as the evaporator returns to the gas-liquid separator 111 through the third pipeline 5 and then enters the suction port of the compressor 101.

[0211] Complete condensation partition: such as Figure 7As shown, the return port and the working port of the first control valve 102 are connected, the inlet and the working port of the second control valve 104 are not connected, the inlet and the working port of the third control valve 103 are connected, the first outdoor heat exchanger 105 serves as an evaporator, and the second outdoor heat exchanger 107 serves as a condenser.

[0212] At this time, the first outdoor heat exchanger 105 functions as an evaporator, and the second outdoor heat exchanger 107 functions as a condenser. The refrigerant discharged from the compressor 101 passes through the third control valve 103 and enters the second outdoor heat exchanger 107 for condensation. A portion then enters the first pipeline 3, while the remaining portion, after being throttled by the first outdoor expansion valve 106, enters the first outdoor heat exchanger 105 for evaporation. The remaining portion then passes through the first control valve 102 and returns to the gas-liquid separator 111 before entering the intake port of the compressor 101. Simultaneously, the refrigerant discharged from the indoor heat exchanger 7 and / or accumulator 201, acting as the evaporator, returns to the gas-liquid separator 111 through the third pipeline 5 before entering the intake port of the compressor 101.

[0213] Main condensation partition: such as Figure 8 As shown, the return port and the working port of the first control valve 102 are connected, and the inlet and the working port of the second control valve 104 are connected to transport part of the refrigerant to the indoor heat exchanger 7 and / or the accumulator 201 for condensation, the inlet and the working port of the third control valve 103 are connected, the first outdoor heat exchanger 105 serves as an evaporator, and the second outdoor heat exchanger 107 serves as a condenser.

[0214] At this time, the first outdoor heat exchanger 105 functions as an evaporator, and the second outdoor heat exchanger 107 functions as a condenser. A portion of the refrigerant discharged from the compressor 101 passes through the third control valve 103 and enters the second outdoor heat exchanger 107 for condensation. It is then divided into two parts: one enters the first pipeline 3, and the other, after being throttled by the second throttle component 106, enters the first outdoor heat exchanger 105 for evaporation. The other portion passes through the first control valve 102 and returns to the gas-liquid separator 111 before entering the intake port of the compressor 101. The remaining portion of the refrigerant discharged from the compressor 101 passes through the second control valve 104 and enters the second pipeline 4. Meanwhile, the refrigerant discharged from the indoor heat exchanger 7 and / or accumulator 201, acting as the evaporator, returns to the gas-liquid separator 111 through the third pipeline 5 before entering the intake port of the compressor 101.

[0215] Complete evaporation partition: such as Figure 9 As shown, the return port and the working port of the first control valve 102 are connected, and the inlet and the working port of the second control valve 104 are connected to transport part of the refrigerant to the indoor heat exchanger 7 and / or the accumulator 201 for condensation. The inlet and the working port of the third control valve 103 are connected, the first outdoor heat exchanger 105 serves as an evaporator, and the second outdoor heat exchanger 107 serves as a condenser. The refrigerant condensed in the indoor heat exchanger 7 and / or the accumulator 201 is transported to the first outdoor heat exchanger 105 through the first pipeline 3 for evaporation.

[0216] At this point, the first outdoor heat exchanger 105 functions as an evaporator, and the second outdoor heat exchanger 107 functions as a condenser. A portion of the refrigerant discharged from the compressor 101 enters the second pipeline 4 through the second control valve 104, while the remaining portion enters the second outdoor heat exchanger 107 through the third control valve 103 for condensation. The medium-pressure refrigerant passes through the first pipeline 3 and merges with the condensed refrigerant in the second outdoor heat exchanger 107, then enters the first outdoor heat exchanger 105 for evaporation. It then passes through the first control valve 102, returns to the gas-liquid separator 111, and then enters the intake port of the compressor 101.

[0217] Main evaporation partition: such as Figure 10 As shown, the return port and the working port of the first control valve 102 are connected, and the inlet and the working port of the second control valve 104 are connected to transport part of the refrigerant to the indoor heat exchanger 7 and / or the accumulator 201 for condensation. The inlet and the working port of the third control valve 103 are connected, the first outdoor heat exchanger 105 serves as an evaporator, and the second outdoor heat exchanger 107 serves as a condenser. After evaporating in the indoor heat exchanger 7 and / or the accumulator 201, part of the refrigerant is transported to the suction port of the compressor 101 through the third pipeline 5.

[0218] At this time, the first outdoor heat exchanger 105 functions as an evaporator, and the second outdoor heat exchanger 107 functions as a condenser. A portion of the refrigerant discharged from the compressor 101 enters the second pipeline 4 through the second control valve 104, while the remaining portion enters the second outdoor heat exchanger 107 through the third control valve 103 for condensation. The medium-pressure refrigerant passes through the first pipeline 3 and merges with the condensed refrigerant in the second outdoor heat exchanger 107, then enters the first outdoor heat exchanger 105 for evaporation. It then passes through the refrigeration four-way valve 102 and returns to the gas-liquid separator 111 before entering the intake port of the compressor 101. Simultaneously, the refrigerant discharged from the indoor heat exchanger 7 and / or accumulator 201, acting as evaporators, also returns to the gas-liquid separator 111 through the third pipeline 5 before entering the intake port of the compressor 101.

[0219] In this embodiment, the first control valve 102, the second control valve 104, and the third control valve 103 are all four-way valves. When the first control valve 102 is powered off, the working port of the first control valve 102, which is connected to the first outdoor heat exchanger 105, is open to its inlet. When the second control valve 104 is powered on, the working port of the second control valve 104, which is connected to the second pipeline 4, is open to its inlet. When the third control valve 103 is powered off, the working port of the third control valve 103, which is connected to the second outdoor heat exchanger 107, is open to its inlet.

[0220] The relationship between the above working modes of the outdoor unit 1 and the first control valve 102, the second control valve 104, the third control valve 103, the second throttling component 106 and the third throttling component 108 is as follows:

[0221]

[0222] In some embodiments, the accumulator 201 of the refrigerant circulation system operates in at least one of the following operating modes:

[0223] The accumulator 201 acts as an evaporator: Figure 11 As shown, the inlet and working port of the first control valve 102 are connected, the first refrigerant inlet and outlet 201a of the accumulator 201 is in the first state to be connected with the first throttling component 206, and the second refrigerant inlet and outlet 201b of the accumulator 201 is in the fourth state to be connected with the third pipeline 5. The refrigerant compressed by the compressor 101 is condensed by the first outdoor heat exchanger 105 and then throttled by the first throttling component 206. The throttled refrigerant enters the accumulator 201 and evaporates to absorb heat. The evaporated refrigerant discharged from the second refrigerant inlet and outlet 201b of the accumulator 201 is transported to the intake port of the compressor 101 through the third pipeline 5.

[0224] At this point, accumulator 201 functions as an evaporator. After being throttled by first throttling component 206, the refrigerant enters accumulator 201 for evaporation and flows out through fourth connecting pipe 203. In this state, two-phase refrigerant enters through the accumulator's first refrigerant inlet 201a and the liquid separator 214 located below the accumulator's first refrigerant inlet 201a, and flows out through the accumulator's second refrigerant inlet 201b.

[0225] The evaporation state can be further divided into evaporative cold storage and evaporative heat release. The difference between these two states lies in the different pre-conditions of the accumulator 201 and their different purposes. When the accumulator 201 has not yet stored cold or heat, it can enter the evaporative cold storage state. At this time, the condensed refrigerant enters the accumulator 201 and stores the cold in preparation for the next release of cold. Only when the accumulator 201 has stored heat can it enter the evaporative heat release state. The condensed refrigerant enters the accumulator 201, absorbs the stored heat in the accumulator 201, and evaporates, thereby absorbing part or all of the evaporation load of the refrigeration cycle.

[0226] The accumulator 201 acts as a subcooler: Figure 12 As shown, the inlet and working port of the first control valve 102 are connected, the second refrigerant inlet and outlet 201b of the accumulator 201 is in the fifth state to connect with the first pipeline 3, and the first refrigerant inlet and outlet 201a of the accumulator 201 is in the second state to connect with the third pipeline 5. The refrigerant compressed by the compressor 101 is condensed by the first outdoor heat exchanger 105 and then throttled by the second throttling component 106. The throttled refrigerant enters the accumulator 201 and evaporates to absorb heat. The first refrigerant inlet and outlet 201a of the accumulator 201 transports the discharged evaporated refrigerant to the indoor heat exchanger 7 through the first pipeline 3.

[0227] At this point, accumulator 201 functions as a subcooler. Refrigerant enters accumulator 201 through cold storage check valve 207 and fifth connecting line 205 for subcooling, increasing the degree of subcooling before exiting through second connecting line 213. In this state, liquid refrigerant enters the accumulator through second refrigerant inlet 201b and exits through first refrigerant inlet 201a and liquid separator 214.

[0228] The accumulator 201 acts as a condenser: Figure 13 As shown, the first refrigerant inlet and outlet 201a of the accumulator 201 is in the second state to be connected with the first pipeline 3; the second refrigerant inlet and outlet 201b is in the third state to circulate refrigerant with the second pipeline 4 or the exhaust port of the compressor 101. The refrigerant compressed by the compressor 101 is transported to the accumulator 201 for condensation. The condensed refrigerant is transported to the first pipeline 3 through the first refrigerant inlet and outlet 201a of the accumulator 201. The first pipeline 3 transports the condensed refrigerant to the indoor heat exchanger 7.

[0229] At this point, accumulator 201 functions as a condenser. Refrigerant enters accumulator 201 through third connecting line 202 and fifth connecting line 205, where it condenses and then exits through second connecting line 213. In this state, gaseous refrigerant enters through the accumulator's second refrigerant inlet 201b, and after condensation, liquid refrigerant exits through the accumulator's first refrigerant inlet 201a and liquid separator 214.

[0230] The condensation state can be further divided into condensation cold release and condensation heat storage. The difference between these two states lies in the different pre-conditions of the accumulator 201 and their different purposes. The condensation cold release state can only be entered after the accumulator 201 has stored cold. At this time, high-temperature and high-pressure refrigerant enters the accumulator 201, absorbs the cold stored in the accumulator 201 and evaporates, with the purpose of taking on part or all of the condensation load of the refrigeration cycle. When the accumulator 201 has not yet stored cold or heat, it can enter the condensation heat storage state. At this time, high-temperature and high-pressure refrigerant enters the accumulator 201 and stores heat in the accumulator 201 in preparation for the next heat release.

[0231] The relationship between the above working modes of the energy storage device 2 and the second switch valve 208, the third switch valve 210, the fourth switch valve 212 and the first throttling component 206 is as follows:

[0232]

[0233] like Figure 14 As shown, at this time, the indoor unit acts as an evaporator, and the refrigerant enters the indoor unit through the first indoor unit pipeline 604 to evaporate and flows out through the refrigeration control valve 602. Figure 15 As shown, at this time, the indoor unit 7 acts as a condenser, and the refrigerant enters the indoor unit through the heating control valve 603 for condensation and then flows out through the first indoor unit pipeline 604.

[0234] By combining different modes of the outdoor unit 1, the energy storage device 2, and the indoor unit, the refrigerant circulation system of this embodiment operates in at least one of the following multiple working modes:

[0235] Conventional full cooling: In the conventional full cooling mode, the inlet and working port of the first control valve 102 are connected, the inlet and working port of the second control valve 104 are not connected, the inlet and working port of the third control valve 103 are connected, and the accumulator 201 is shut down. The first switch valve 211 in the first pipeline 3 connected in parallel with the accumulator 201 is opened. The first outdoor heat exchanger 105 and the second outdoor heat exchanger 107 both function as condensers. The accumulator 201 is shut down, and the indoor heat exchanger 7 functions as an evaporator.

[0236] Conventional main cooling: In the conventional main cooling mode, the inlet and the working port of the second control valve 104 are connected to transport part of the compressed refrigerant to the indoor heat exchanger 7 for condensation, and the other part of the refrigerant is condensed in the first outdoor heat exchanger 105 and / or the second outdoor heat exchanger 107. The condensed refrigerant evaporates in the indoor heat exchanger 7. The evaporation amount of the refrigerant in the indoor heat exchanger 7 is greater than the condensation amount. The accumulator 201 is shut down and the first switch valve 211 is opened.

[0237] Complete cold storage: In the complete cold storage mode, the refrigerant is compressed in the compressor 101, and all of the compressed refrigerant is condensed in the first outdoor heat exchanger 105 and / or the second outdoor heat exchanger 107. The condensed refrigerant evaporates in the accumulator 201, and the accumulator 201 stores cold energy. The indoor units of the refrigerant circulation system including the indoor heat exchanger 7 are shut down, and the first on / off valve 211 is closed.

[0238] Cold storage and complete cooling: In the cold storage and complete cooling mode, the refrigerant is compressed in the compressor 101, and the compressed refrigerant is completely condensed in the first outdoor heat exchanger 105 and / or the second outdoor heat exchanger 107. The condensed refrigerant evaporates in the accumulator 201 and the indoor heat exchanger 7, and the first switch valve 211 is opened;

[0239] Cold storage and simultaneous complete heating with outdoor unit condensing: In the cold storage and simultaneous complete heating with outdoor unit condensing mode, the refrigerant is in the compressor 101, and the partially compressed refrigerant is condensed in the first outdoor heat exchanger 105 and / or the second outdoor heat exchanger 107. The partially compressed refrigerant is condensed in the indoor heat exchanger 7, and the condensed refrigerant evaporates in the accumulator 201. The first on-off valve 211 is open.

[0240] Cooling storage and simultaneous complete heating with outdoor unit evaporation: In the cooling storage and simultaneous complete heating with outdoor unit evaporation mode, the refrigerant is compressed in the compressor 101, condensed in the indoor heat exchanger 7, partially condensed in the first outdoor heat exchanger 105 and / or the second outdoor heat exchanger 107, and partially evaporated in the accumulator 201. The accumulator 201 stores cold energy, and the first on-off valve 211 is opened.

[0241] Cold storage and main body cooling: In the cold storage and main body cooling mode, the refrigerant is compressed in the compressor 101, and part of the compressed refrigerant is condensed in the first outdoor heat exchanger 105 and / or the second outdoor heat exchanger 107. The part of the compressed refrigerant is condensed in the indoor heat exchanger 7, and the part of the condensed refrigerant evaporates in the accumulator 201. The accumulator 201 stores cold energy, and the part of the condensed refrigerant evaporates in the indoor heat exchanger 7. The evaporation amount of the refrigerant in the indoor heat exchanger 7 is greater than the condensation amount, and the first on-off valve 211 is opened.

[0242] Cold storage with main heating and outdoor unit evaporation: In the cold storage with main heating and outdoor unit evaporation mode, the refrigerant is compressed in the compressor 101, and the compressed refrigerant is condensed in the indoor heat exchanger 7. The partially condensed refrigerant evaporates in the indoor heat exchanger 7. The evaporation amount of the refrigerant in the indoor heat exchanger 201 is less than the condensation amount. The partially condensed refrigerant evaporates in the accumulator 201, and the accumulator 201 stores cold energy. The partially condensed refrigerant evaporates in the first outdoor heat exchanger 105 and / or the second outdoor heat exchanger 107, and the first on-off valve 211 is opened.

[0243] Cold storage with main body heating and outdoor unit condensing: In the cold storage with main body heating and outdoor unit condensing mode, the refrigerant is compressed in the compressor 101, part of the compressed refrigerant is condensed in the first outdoor heat exchanger 105 and / or the second outdoor heat exchanger 107, part of the compressed refrigerant is condensed in the indoor heat exchanger 7, part of the condensed refrigerant is evaporated in the accumulator 201, part of the condensed refrigerant is evaporated in the indoor heat exchanger 7, and the first on-off valve 211 is opened;

[0244] Subcooling and simultaneous complete refrigeration: In the subcooling and simultaneous complete refrigeration mode, the refrigerant is compressed in the compressor 101, and the fully compressed refrigerant is condensed in the first outdoor heat exchanger 105 and / or the second outdoor heat exchanger 107. The condensed refrigerant enters the accumulator 201 and partially evaporates. The accumulator 201 acts as a subcooler, and the subcooled refrigerant is transported to the indoor heat exchanger 7 for evaporation. The first switch valve 211 is closed.

[0245] Subcooling and cooling with simultaneous main cooling: In the subcooling and cooling with simultaneous main cooling mode, the refrigerant is compressed in the compressor 101, and the partially compressed refrigerant is condensed in the first outdoor heat exchanger 105 and / or the second outdoor heat exchanger 107. The condensed refrigerant enters the accumulator 201 and partially evaporates. The accumulator 201 acts as a subcooler, and the subcooled refrigerant is transported to the indoor heat exchanger 7 for evaporation. The partially compressed refrigerant condenses in the indoor heat exchanger 7, and the first switch valve 211 is closed.

[0246] Condensation and cooling with full cooling: In the condensation and cooling with full cooling mode, the outdoor unit 1 is turned off, the refrigerant is compressed in the compressor 101, the compressed refrigerant is condensed in the accumulator 201, the accumulator 201 releases the cooling capacity, the condensed refrigerant evaporates in the indoor heat exchanger 7, and the first switch valve 211 is closed;

[0247] Condensation and cooling with main cooling: In the condensation and cooling mode, the outdoor unit 1 is turned off, the refrigerant is compressed in the compressor 101, and part of the compressed refrigerant is condensed in the accumulator 201. The accumulator 201 releases the cooling capacity, and the condensed refrigerant evaporates in the indoor heat exchanger 7. Part of the compressed refrigerant is condensed in the indoor heat exchanger 7, and the first switch valve 211 is closed.

[0248] Parallel cooling and simultaneous complete cooling: In the parallel cooling and simultaneous complete cooling mode, the refrigerant is compressed in the compressor 101, and the partially compressed refrigerant is condensed in the first outdoor heat exchanger 105 and / or the second outdoor heat exchanger 107. The partially compressed refrigerant is condensed in the accumulator 201, and the accumulator 201 releases the cooling capacity. The condensed refrigerant evaporates in the indoor heat exchanger 7, and the first on-off valve 211 is closed.

[0249] Parallel cooling and simultaneous main cooling: In the parallel cooling and simultaneous main cooling mode, the refrigerant is compressed in the compressor 101, and part of the compressed refrigerant is condensed in the first outdoor heat exchanger 105 and / or the second outdoor heat exchanger 107. The part of the compressed refrigerant is condensed in the accumulator 201, and the accumulator 201 releases the cooling capacity. The condensed refrigerant evaporates in the indoor heat exchanger 7, and part of the compressed refrigerant is condensed in the indoor heat exchanger 7. The first switch valve 211 is closed.

[0250] Here, full heating means that the multiple indoor heat exchangers 7 are all used as condensers for heating.

[0251] When the main body is heating, the condensation amount of the refrigerant in the indoor heat exchanger 7 is greater than the evaporation amount. When the main body is cooling, the condensation amount of the refrigerant in the indoor heat exchanger 7 is less than the evaporation amount. When fully heating, the indoor heat exchanger 7 is only used to condense the refrigerant. When fully cooling, the indoor heat exchanger 7 is only used to evaporate the refrigerant.

[0252] In this embodiment, the indoor heat exchanger 7 can serve as both an evaporator and a condenser.

[0253] By combining different modes of the outdoor unit 1, the energy storage device 2 and the indoor unit, the refrigerant circulation system operates in at least one of the following multiple working modes:

[0254] Conventional full heating: In conventional full heating mode, the refrigerant is compressed in the compressor 101, the accumulator 201 is shut down, the compressed refrigerant is condensed in the indoor heat exchanger 7, the condensed refrigerant is evaporated in the first outdoor heat exchanger 105 and / or the second outdoor heat exchanger 107, and the evaporated refrigerant is delivered to the suction port of the compressor 1. The first on-off valve 211 in the first pipeline 3 in parallel with the accumulator 201 is opened;

[0255] Conventional main heating: In the conventional full main heating mode, the refrigerant is compressed in the compressor 101, the accumulator 201 is shut down, and part of the compressed refrigerant is condensed in the indoor heat exchanger 7. The condensed refrigerant evaporates in the first outdoor heat exchanger 105 and / or the second outdoor heat exchanger 107, and part of the compressed refrigerant is condensed in the indoor heat exchanger. The first on-off valve 211 is opened;

[0256] Full heat storage: In the full heat storage mode, the indoor heat exchanger 7 is closed, the refrigerant is compressed in the compressor 101, the compressed refrigerant is condensed in the accumulator 201, the accumulator 201 stores heat, and the condensed refrigerant is evaporated in the first outdoor heat exchanger 105 and / or the second outdoor heat exchanger 107, and the first on-off valve 211 is opened;

[0257] Thermal storage and complete heating: In the thermal storage and complete heating mode, the refrigerant is compressed in the compressor 101, the compressed refrigerant is condensed in the accumulator 201 and the indoor heat exchanger 7, and the condensed refrigerant is evaporated in the first outdoor heat exchanger 105 and / or the second outdoor heat exchanger 107, and the first switch valve 211 is opened;

[0258] Thermal storage and simultaneous complete cooling with outdoor unit evaporation: In the thermal storage and simultaneous complete cooling and outdoor unit evaporation mode, the refrigerant is compressed in the compressor 101, and the compressed refrigerant is condensed in the accumulator 201. The accumulator 201 stores heat, and the partially condensed refrigerant evaporates in the indoor heat exchanger 7. The partially condensed refrigerant evaporates in the first outdoor heat exchanger 105 and / or the second outdoor heat exchanger 107, and the first switch valve 211 is opened.

[0259] Thermal storage and simultaneous complete cooling with outdoor unit condensation: In the thermal storage and simultaneous complete cooling with outdoor unit condensation mode, the refrigerant is compressed in the compressor 101, the partially compressed refrigerant is condensed in the first outdoor heat exchanger 105 and / or the second outdoor heat exchanger 107, the partially compressed refrigerant is condensed in the accumulator 201, the condensed refrigerant evaporates in the indoor heat exchanger 7, and the first on-off valve 211 is opened;

[0260] Heat storage and main body heating: In the heat storage and main body heating mode, the refrigerant is compressed in the compressor 101, and part of the compressed refrigerant is condensed in the indoor heat exchanger 7. The indoor heat exchanger 7 generates heat, and part of the compressed refrigerant is condensed in the accumulator 201. The accumulator 201 stores heat, and part of the condensed refrigerant evaporates in the first outdoor heat exchanger 105 and / or the second outdoor heat exchanger 107. Part of the condensed refrigerant evaporates in the indoor heat exchanger 7, and the first on-off valve 211 is opened.

[0261] Thermal storage with main body cooling and outdoor unit condensing: In the thermal storage with main body cooling and outdoor unit condensing mode, the refrigerant is compressed in the compressor 101, and part of the compressed refrigerant is condensed in the first outdoor heat exchanger 105 and / or the second outdoor heat exchanger 107. Part of the compressed refrigerant is condensed in the accumulator 201, and the condensed refrigerant evaporates in the indoor heat exchanger 7. Part of the compressed refrigerant evaporates in the indoor heat exchanger 7, the amount of refrigerant evaporation in the outdoor unit is less than the amount of refrigerant condensation, the amount of refrigerant evaporation in the indoor heat exchanger 7 is greater than the amount of refrigerant condensation, and the first on-off valve 211 is opened;

[0262] Thermal storage with main body cooling and outdoor unit evaporation: In the thermal storage with main body cooling and outdoor unit evaporation mode, the refrigerant is compressed in the compressor 101, and part of the compressed refrigerant is condensed in the first outdoor heat exchanger 105 and / or the second outdoor heat exchanger 107. Part of the compressed refrigerant is condensed in the accumulator 201, and the condensed refrigerant evaporates in the indoor heat exchanger 7. Part of the compressed refrigerant evaporates in the indoor heat exchanger 7, the amount of refrigerant evaporation in the outdoor unit 1 is greater than the amount of refrigerant condensation, the amount of refrigerant evaporation in the indoor heat exchanger 7 is greater than the amount of refrigerant condensation, and the first on-off valve 211 is opened;

[0263] Mixed heat release and simultaneous complete heating: In the mixed heat release and simultaneous complete heating mode, the refrigerant is compressed in the compressor 101, the compressed refrigerant is condensed in the indoor heat exchanger 7, and part of the condensed refrigerant evaporates in the accumulator 201. The accumulator 201 releases heat, and part of the condensed refrigerant evaporates in the first outdoor heat exchanger 105 and / or the second outdoor heat exchanger 107. The first on-off valve 211 is opened.

[0264] Mixed heat release and main heating: In the mixed heat release and main heating mode, the refrigerant is compressed in the compressor 101, the compressed refrigerant is condensed in the indoor heat exchanger 7, and the partially condensed refrigerant evaporates in the accumulator 201. The accumulator 201 releases heat, and the partially condensed refrigerant evaporates in the first outdoor heat exchanger 105 and / or the second outdoor heat exchanger 107. The first on-off valve 211 is opened;

[0265] Independent heat release and simultaneous full heating: In the independent heat release and simultaneous full heating mode, the first outdoor heat exchanger 105 and the second outdoor heat exchanger 107 are closed, the refrigerant is compressed in the compressor 101, the compressed refrigerant is condensed in the indoor heat exchanger 7, the condensed refrigerant is evaporated in the accumulator 201, the accumulator 201 releases heat, and the first on-off valve 211 is opened;

[0266] Independent heat release and main heating: In the independent heat release and main heating mode, the first outdoor heat exchanger 105 and the second outdoor heat exchanger 107 are closed, the refrigerant is compressed in the compressor 101, the compressed refrigerant is condensed in the indoor heat exchanger 7, and part of the condensed refrigerant evaporates in the accumulator 201. The accumulator 201 releases heat, and part of the condensed refrigerant evaporates in the indoor heat exchanger 7. The first switch valve 211 is opened

[0267] In this context, full heating means that the multiple indoor heat exchangers 7 are all used as condensers for heating, and full cooling means that the multiple indoor heat exchangers 7 are all used as evaporators for cooling. During main heating, the amount of refrigerant condensed in the indoor heat exchangers 7 is greater than the amount of refrigerant evaporated. During main cooling, the amount of refrigerant condensed in the indoor heat exchangers 7 is less than the amount of refrigerant evaporated. During full heating, the indoor heat exchangers 7 are used only for condensing the refrigerant, and during full cooling, the indoor heat exchangers 7 are used only for evaporating the refrigerant.

[0268] By combining different modes of the outdoor unit 1, the energy storage device 2 and the indoor unit, the refrigerant circulation system operates in at least one of the following multiple working modes:

[0269] Non-zoned discontinuous heating and defrosting: In the non-zoned discontinuous heating and defrosting mode, the indoor heat exchanger 7 is closed, the refrigerant is compressed in the compressor 101, and the compressed refrigerant is condensed in the first outdoor heat exchanger 105 and the second outdoor heat exchanger 107 to defrost the first outdoor heat exchanger 105 and the second outdoor heat exchanger 107. The condensed refrigerant evaporates in the accumulator 201, the accumulator 201 releases heat, and the first on-off valve 211 in the first pipeline 3 connected in parallel with the accumulator 201 is closed;

[0270] Partitioned discontinuous heating and defrosting: In the partitioned discontinuous heating and defrosting mode, one of the first outdoor heat exchanger 105 and the second outdoor heat exchanger 107 is used as a condenser to achieve defrosting, and the other is used as an evaporator. The refrigerant compressed by the compressor 101 is condensed in the first outdoor heat exchanger 105 and the second outdoor heat exchanger 107. The condensed refrigerant evaporates in the accumulator 201, the accumulator 201 releases heat, and the first switch valve 211 is closed.

[0271] Non-zoned continuous heating, defrosting and full heating: In the non-zoned continuous heating, defrosting and full heating mode, the refrigerant is compressed in the compressor 101, and the partially compressed refrigerant is condensed in the first outdoor heat exchanger 105 and / or the second outdoor heat exchanger 107. The partially compressed refrigerant is condensed in the indoor heat exchanger 7, and the condensed refrigerant evaporates in the accumulator 201, the accumulator 201 releases heat, and the first switch valve 211 is opened;

[0272] Non-zoned continuous heating and defrosting with main heating: In the non-zoned continuous heating and defrosting with main heating mode, the refrigerant is compressed in the compressor 101, and part of the compressed refrigerant is condensed in the first outdoor heat exchanger 105 and / or the second outdoor heat exchanger 107. The part of the compressed refrigerant is condensed in the indoor heat exchanger 7, and the part of the condensed refrigerant evaporates in the accumulator 201. The accumulator 201 releases heat, and the part of the condensed refrigerant evaporates in the indoor heat exchanger 7. The evaporation amount of the refrigerant in the indoor heat exchanger 7 is less than the condensation amount, and the first switch valve 211 is opened.

[0273] Non-zoned continuous heating and defrosting with main cooling: In the non-zoned continuous heating and defrosting with main cooling mode, the refrigerant is compressed in the compressor 101, and part of the compressed refrigerant is condensed in the first outdoor heat exchanger 105 and / or the second outdoor heat exchanger 107. The part of the compressed refrigerant is condensed in the indoor heat exchanger 7, and the part of the condensed refrigerant evaporates in the accumulator 201. The accumulator 201 releases heat, and the part of the condensed refrigerant evaporates in the indoor heat exchanger 7. The evaporation amount of the refrigerant in the indoor heat exchanger 7 is greater than the condensation amount, and the first switch valve 211 is opened;

[0274] Partitioned continuous heating and defrosting with full heating and outdoor unit condensing: In the partitioned continuous heating and defrosting with full heating and outdoor unit condensing mode, the refrigerant is compressed in the compressor 101, the partially compressed refrigerant is condensed in one of the first outdoor heat exchanger 105 and the second outdoor heat exchanger 107, the partially compressed refrigerant is condensed in the indoor heat exchanger 7, the condensed refrigerant evaporates in the accumulator 201 and the other of the first outdoor heat exchanger 105 and the second outdoor heat exchanger 107, the accumulator 201 releases heat, and the first on-off valve 211 is opened;

[0275] Partitioned continuous heating and defrosting with condensation of the main heating outdoor unit: In the partitioned continuous heating and defrosting with condensation of the main heating outdoor unit mode, the refrigerant is compressed in the compressor 101, and the partially compressed refrigerant is condensed in one of the first outdoor heat exchanger 105 and the second outdoor heat exchanger 107. The partially compressed refrigerant is condensed in the indoor heat exchanger 7. The condensed refrigerant evaporates in the indoor heat exchanger 7, the accumulator 201, and the other of the first outdoor heat exchanger 105 and the second outdoor heat exchanger 107. The accumulator 201 releases heat. The evaporation amount of the refrigerant in the indoor heat exchanger 7 is less than the condensation amount, and the first on-off valve 211 is opened.

[0276] Partitioned continuous heating and defrosting with condensation in the main refrigeration outdoor unit: In the partitioned continuous heating and defrosting with condensation in the main refrigeration outdoor unit mode, the refrigerant is compressed in the compressor 101, and the partially compressed refrigerant is condensed in one of the first outdoor heat exchanger 105 and the second outdoor heat exchanger 107. The partially compressed refrigerant is condensed in the indoor heat exchanger 7. The condensed refrigerant evaporates in the indoor heat exchanger 7, the accumulator 201, and the other of the first outdoor heat exchanger 105 and the second outdoor heat exchanger 107. The accumulator 201 releases heat, and the evaporation amount of the refrigerant in the indoor heat exchanger 7 is greater than the condensation amount, so the first switch valve 211 is opened.

[0277] Partitioned continuous heating and defrosting with full heating and outdoor unit evaporation: In the partitioned continuous heating and defrosting with full heating and outdoor unit evaporation mode, the refrigerant is compressed in the compressor 101, the partially compressed refrigerant is condensed in one of the first outdoor heat exchanger 105 and the second outdoor heat exchanger 107, the partially compressed refrigerant is condensed in the indoor heat exchanger 7, the condensed refrigerant is evaporated in the accumulator 201 and the other of the first outdoor heat exchanger 105 and the second outdoor heat exchanger 107, the accumulator 201 releases heat, and the first switching valve 211 is opened;

[0278] Partitioned continuous heating and defrosting with evaporation of the main heating outdoor unit: In the partitioned continuous heating and defrosting with evaporation of the main heating outdoor unit mode, the refrigerant is compressed in the compressor 101, and the partially compressed refrigerant is condensed in one of the first outdoor heat exchanger 105 and the second outdoor heat exchanger 107. The partially compressed refrigerant is condensed in the indoor heat exchanger 7, and the condensed refrigerant evaporates in the indoor heat exchanger 7, the accumulator 201, and the other of the first outdoor heat exchanger 105 and the second outdoor heat exchanger 107. The accumulator 201 releases heat, and the evaporation amount of the refrigerant in the indoor heat exchanger 7 is less than the condensation amount, so the first switch valve 211 is opened.

[0279] Partitioned continuous heating and defrosting with evaporation of the main refrigeration outdoor unit: In the partitioned continuous heating and defrosting with evaporation of the main refrigeration outdoor unit mode, the refrigerant is compressed in the compressor 101, and the partially compressed refrigerant is condensed in one of the first outdoor heat exchanger 105 and the second outdoor heat exchanger 107. The partially compressed refrigerant is condensed in the indoor heat exchanger 7. The condensed refrigerant evaporates in the indoor heat exchanger 7, the accumulator 201, and the other of the first outdoor heat exchanger 105 and the second outdoor heat exchanger 107. The accumulator 201 releases heat, and the evaporation amount of the refrigerant in the indoor heat exchanger 7 is greater than the condensation amount. The first switch valve 211 is opened.

[0280] The full heating mode refers to that the plurality of indoor heat exchangers 7 are all used as condensers for heating, and the full cooling mode refers to that the plurality of indoor heat exchangers 7 are all used as evaporators for cooling.

[0281] When the main body is heating, the condensation amount of the refrigerant in the indoor heat exchanger 7 is greater than the evaporation amount. When the main body is cooling, the condensation amount of the refrigerant in the indoor heat exchanger 7 is less than the evaporation amount. When fully heating, the indoor heat exchanger 7 is only used to condense the refrigerant. When fully cooling, the indoor heat exchanger 7 is only used to evaporate the refrigerant.

[0282] By combining different modes of the outdoor unit 1, the energy storage device 2 and the indoor unit, the refrigerant circulation system operates in at least one of the following multiple working modes:

[0283] Conventional heat recovery: In conventional heat recovery mode, the first outdoor heat exchanger 105 and the second outdoor heat exchanger 107 are shut down, the accumulator 201 is shut down, the refrigerant is compressed in the compressor 101, the compressed refrigerant is condensed in some indoor heat exchangers 7, and the condensed refrigerant is evaporated in another part of the indoor heat exchanger 7. The first on-off valve 211 in the first pipeline 3 in parallel with the accumulator 201 is closed.

[0284] Cold storage and heat recovery: In the cold storage and heat recovery mode, the first outdoor heat exchanger 105 and the second outdoor heat exchanger 107 are shut down, the refrigerant is compressed in the compressor 101, the compressed refrigerant is condensed in part of the indoor heat exchanger 7, and the condensed refrigerant evaporates in another part of the indoor heat exchanger 7 and the accumulator 201. The accumulator 201 stores cold energy. The evaporation amount of the refrigerant in the indoor heat exchanger 7 is less than the condensation amount, and the first on-off valve 211 is closed.

[0285] Heat storage and heat recovery: In the heat storage and heat recovery mode, the first outdoor heat exchanger 105 and the second outdoor heat exchanger 107 are shut down, the refrigerant is compressed in the compressor 101, and the compressed refrigerant is condensed in the accumulator 201 and part of the indoor heat exchanger 7. The accumulator 201 stores heat, and the condensed refrigerant evaporates in another part of the indoor heat exchanger 7. The evaporation amount of the refrigerant in the indoor heat exchanger 7 is greater than the condensation amount, and the first switch valve 211 is closed;

[0286] Cooling and heat recovery: In the cooling and heat recovery mode, the first outdoor heat exchanger 105 and the second outdoor heat exchanger 107 are shut down, the refrigerant is compressed in the compressor 101, and the compressed refrigerant is condensed in the accumulator 201 and part of the indoor heat exchanger 7. The accumulator 201 releases the cooling capacity, and the condensed refrigerant evaporates in another part of the indoor heat exchanger 7. The evaporation amount of the refrigerant in the indoor heat exchanger 7 is greater than the condensation amount, and the first switch valve 211 is closed.

[0287] Heat release and heat recovery at the same time: In the heat release and heat recovery mode, the first outdoor heat exchanger 105 and the second outdoor heat exchanger 107 are shut down, the refrigerant is compressed in the compressor 101, the compressed refrigerant is condensed in part of the indoor heat exchanger 7, the condensed refrigerant evaporates in another part of the indoor heat exchanger 7 and the accumulator 201, the accumulator 201 releases heat, the evaporation amount of the refrigerant in the indoor heat exchanger 7 is less than the condensation amount, and the first switch valve 211 is closed.

[0288] The working modes of the refrigerant circulation system of this embodiment are as follows:

[0289]

[0290]

[0291]

[0292] The technical effects of this embodiment are as follows:

[0293] Beneficial effects:

[0294] 1. The air conditioning system stores energy during off-peak electricity price periods and releases it during peak electricity price periods, thereby reducing power consumption during these periods. This achieves "peak shaving" of electricity demand and reduces air conditioning operating costs.

[0295] 2. By switching pipelines and valves, the heat recovery air conditioning system can achieve 44 functions, including complete cold storage, cold storage and complete cooling, cold storage and main body cooling, etc., which broadens the scope of use of the energy storage system, greatly improves the availability of the energy storage system, and can flexibly respond to different application scenarios.

[0296] 3. It can not only ensure the uniform liquid distribution when the liquid refrigerant enters the accumulator, but also reduce the pressure loss when the gaseous refrigerant enters the accumulator.

[0297] 4. The outdoor heat exchanger can be defrosted in different areas to concentrate energy, save defrosting heat and shorten defrosting time, and improve indoor heating comfort.

[0298] The above are merely exemplary embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A refrigerant circulation system, characterized in that: include: The compressor (101) includes an air intake for introducing a refrigerant to be compressed and an air discharge port for discharging the compressed refrigerant; A first control valve (102) includes an inlet connected to the exhaust port of the compressor (101), a return port connected to the intake port of the compressor (101), and a working port selectively connected to one of the inlet and the return port; A first outdoor heat exchanger (105) is connected to a working port of the first control valve (102); A first pipeline (3) is in communication with the first outdoor heat exchanger (105); A second control valve (104) includes an inlet connected to the exhaust port of the compressor (101) and a working port that is openable and disconnectable to the inlet; A second pipeline (4) is connected to the working port of the second control valve (104); a third pipeline (5) communicating with the air intake port of the compressor (101); a first throttling component (206) in communication with the first pipeline (3); The accumulator (201) comprises a first refrigerant inlet and outlet (201a) and a second refrigerant inlet and outlet (201b), wherein the first refrigerant inlet and outlet (201a) of the accumulator (201) can be switched between a first state and a second state, wherein in the first state, refrigerant flows between the first refrigerant inlet and outlet (201a) of the accumulator (201) and the first throttling component (206), and in the second state, refrigerant flows between the first refrigerant inlet and outlet (201a) of the accumulator (201) and the first pipeline (3), and the second refrigerant inlet and outlet (201b) of the accumulator (201) can be switched between a third state and a fourth state, wherein in the third state, refrigerant flows between the second refrigerant inlet and outlet (201b) of the accumulator (201) and the second pipeline (4) or the exhaust port of the compressor (101), and in the fourth state, refrigerant flows between the second refrigerant inlet and outlet (201b) of the accumulator (201) and the third pipeline (5); The indoor heat exchanger (7) includes a first refrigerant inlet and outlet and a second refrigerant inlet and outlet. The first refrigerant inlet and outlet of the indoor heat exchanger (7) is connected to the first pipeline (3). The second refrigerant inlet and outlet of the indoor heat exchanger (7) can be selectively connected to one of the second pipeline (4) and the third pipeline (5). The second refrigerant inlet (201b) of the accumulator (201) further has a fifth state in which refrigerant flows between the first pipeline (3), and the second refrigerant inlet (201b) of the accumulator (201) can be switched between the third state, the fourth state, and the fifth state. The refrigerant circulation system further includes: a third control valve (103), comprising an inlet connected to the exhaust port of the compressor (101), a return port connected to the intake port of the compressor (101), and a working port, wherein the working port of the third control valve (103) can be selectively connected to one of the inlet and the return port; The second outdoor heat exchanger (107) has one end in communication with the working port of the third control valve (103) and the other end in communication with the first pipeline (3).

2. The refrigerant circulation system according to claim 1, characterized in that: Also includes: A second throttling component (106) comprising a first inlet and outlet communicating with the first outdoor heat exchanger (105) and a second inlet and outlet communicating with the first pipeline (3); The third throttling component (108) includes a first inlet and outlet communicating with the second outdoor heat exchanger (107) and a second inlet and outlet communicating with the first pipeline (3); the second inlet and outlet of the third throttling component (108) is communicated with the second inlet and outlet of the second throttling component (106).

3. The refrigerant circulation system according to claim 1, characterized in that: The second control valve (104) further comprises a return port connected to the suction port of the compressor (101), and the working port of the second control valve (104) can be selectively connected to one of the inlet of the second control valve (104) and the return port of the second control valve (104).

4. The refrigerant circulation system according to claim 1, characterized in that: Also includes: a first connecting pipeline (207), one end of which is connected to the first refrigerant inlet and outlet (201a), and the other end of which is connected to the first pipeline (3); the first throttling component (206) is provided in the first connecting pipeline (207); A second connecting pipe (213) is connected to the first refrigerant inlet and outlet (201a) at one end and to the first pipe (3) at the other end, wherein the connection between the second connecting pipe (213) and the first pipe (3) is closer to the indoor heat exchanger (7) in the flow direction of the first pipe (3) than the connection between the first connecting pipe (207) and the first pipe (3).

5. The refrigerant circulation system according to claim 4, characterized in that: Also includes: a first switch valve (211) provided in the first pipeline (3) and located between a connection point between the first communicating pipeline (207) and the first pipeline (3) and a connection point between the second communicating pipeline (213) and the first pipeline (3); The first one-way valve (209) is provided in the second connecting pipeline (213), and the inlet end of the first one-way valve (209) is connected to the first refrigerant inlet and outlet (201a) of the accumulator (201).

6. The refrigerant circulation system according to claim 1, characterized in that: Also includes: A third connecting pipeline (202), one end of which is connected to the exhaust port of the compressor (101) or the second pipeline (4), and the other end of which is connected to the second refrigerant inlet and outlet (201b) of the accumulator (201); The fourth connecting pipeline (203) has one end connected to the second refrigerant inlet and outlet (201b) of the accumulator (201), and the other end connected to the third pipeline (5).

7. The refrigerant circulation system according to claim 6, characterized in that: Also includes: a second on-off valve (208), provided in the third connecting pipeline (202); The third switch valve (210) is provided in the fourth connecting pipeline (203).

8. The refrigerant circulation system according to claim 7, characterized in that: The other end of the third connecting line (202) is connected to the first connecting line (207) connecting the first refrigerant inlet and outlet (201a) and the first line (3), and the connection between the other end of the third connecting line (202) and the first connecting line (207) is located between the first line (3) and the first throttling component (206) in the flow direction of the first connecting line (207). The refrigerant circulation system also includes a fifth connecting line (205), one end of the fifth connecting line (205) is connected to the first connecting line (207), and the other end is connected to the second refrigerant inlet and outlet (201b) of the accumulator (201).

9. The refrigerant circulation system according to claim 8, characterized in that: The connection point between one end of the fifth connecting pipe (205) and the first connecting pipe (207) is located between the first pipe (3) and the first throttling component (206) in the flow direction of the first connecting pipe (207).

10. The refrigerant circulation system according to claim 8, characterized in that: Also includes: a fourth switch valve (212), provided in the fifth connecting pipeline (205); The second one-way valve is provided in the first communicating pipeline (207) and is located between the first pipeline (3) and the fifth communicating pipeline (205) in the flow direction of the first communicating pipeline (207).

11. The refrigerant circulation system according to claim 1, wherein: Also includes: A refrigeration control valve (602), one end of which is connected to the second refrigerant inlet and outlet of the indoor heat exchanger, and the other end of which is connected to the third pipeline (5); The heating control valve (603) has one end connected to the second refrigerant inlet and outlet of the indoor heat exchanger and the other end connected to the second pipeline (4).

12. An air conditioning device, characterized in that: A refrigerant circulation system comprising the refrigerant circulation system according to any one of claims 1 to 11.

13. A method for controlling a refrigerant circulation system according to any one of claims 1 to 11, characterized in that: The method comprises controlling the refrigerant circulation system to operate in at least one of a cold storage mode, a heat storage mode, a heat release mode and a heat release mode, wherein: In the cold storage mode, the inlet and the working port of the first control valve (102) are controlled to be connected, the first refrigerant inlet (201a) of the accumulator (201) is in the first state to communicate with the first throttling component (206), and the second refrigerant inlet (201b) of the accumulator (201) is in the fourth state to communicate with the third pipeline (5); In the heat storage mode, the return port of the first control valve (102) is controlled to be connected to the working port, the first refrigerant inlet (201a) of the accumulator (201) is in the second state to be connected to the first pipeline (3), and the second refrigerant inlet (201b) of the accumulator (201) is in the third state to be connected to the second pipeline (4) or the exhaust port of the compressor (101); In the heat release mode, the second refrigerant inlet (201b) of the accumulator (201) is in the fourth state to communicate with the third pipeline (5), and the first refrigerant inlet (201a) of the accumulator (201) is in the first state to communicate with the first throttling component (206); In the cooling capacity release mode, the first refrigerant inlet (201a) of the accumulator (201) is in a second state to communicate with the first pipeline (3), and the second refrigerant inlet (201b) of the accumulator (201) is in a third state to communicate with the second pipeline (4) or the exhaust port of the compressor (101).

14. The control method according to claim 13, characterized in that: include: During a period of high electricity prices, the refrigerant circulation system operates in a cooling mode or a heat release mode. During a period of low electricity prices in the power supply system, the refrigerant circulation system is in a cooling capacity storage mode or a heating capacity storage mode.

15. The control method according to claim 13, characterized in that: The invention is characterized by comprising: Arrange multiple indoor heat exchangers (7) in parallel; or A second outdoor heat exchanger (107) and a third control valve (103) are provided in parallel with the first outdoor heat exchanger (105). The third control valve (103) comprises an inlet connected to the exhaust port of the compressor (101), a return port connected to the intake port of the compressor (101), and a working port. The working port of the third control valve (103) can be selectively connected to one of the inlet and the return port.

16. The control method according to claim 15, characterized in that: The outdoor unit (1) of the refrigerant circulation system is controlled to operate in at least one of the following multiple working modes: Complete condensation: the inlet and the working port of the first control valve (102) are connected, the inlet and the working port of the second control valve (104) are not connected, the inlet and the working port of the third control valve (103) are connected, the first outdoor heat exchanger (105) and the second outdoor heat exchanger (107) both serve as condensers, and the refrigerant condenses in the first outdoor heat exchanger (105) and the second outdoor heat exchanger (107); The main body is condensed, the inlet and the working port of the first control valve (102) are connected, the inlet and the working port of the second control valve (104) are connected to transport part of the refrigerant to the indoor heat exchanger (7) and / or the accumulator (201) for condensation, and the inlet and the working port of the third control valve (103) are connected. Complete evaporation, the return port and the working port of the first control valve (102) are connected, the inlet and the working port of the second control valve (104) are connected, the return port and the working port of the third control valve (103) are connected, the refrigerant is condensed in the indoor heat exchanger (7) and / or the accumulator (201), and the condensed refrigerant is transported to the first outdoor heat exchanger (105) and the second outdoor heat exchanger (107) for evaporation; Main body evaporation: the return port and the working port of the first control valve (102) are connected, and the inlet and the working port of the second control valve (104) are connected to transport part of the refrigerant to the indoor heat exchanger (7) and / or the accumulator (201) for condensation. The return port and the working port of the third control valve (103) are connected, and part of the refrigerant is condensed in the indoor heat exchanger (7) and / or the accumulator (201). The condensed refrigerant is transported to the first outdoor heat exchanger (105) and the second outdoor heat exchanger (107) for evaporation. Part of the refrigerant evaporates in the indoor heat exchanger (7) and / or the accumulator (201). The evaporated refrigerant is transported to the suction port of the compressor (101) through the third pipeline (5); The heat exchanger of the outdoor unit is shut down: the inlet and the working port of the second control valve (104) are connected, and the refrigerant is transported to one of the indoor heat exchanger (7) and / or the accumulator (201) for condensation, and evaporated in the other and then transported to the suction port of the compressor (101) through the third pipeline (5); Complete condensation partition: the return port and the working port of the first control valve (102) are connected, the inlet and the working port of the second control valve (104) are not connected, the inlet and the working port of the third control valve (103) are connected, the first outdoor heat exchanger (105) serves as an evaporator, and the second outdoor heat exchanger (107) serves as a condenser; Main condensation partition: the return port and the working port of the first control valve (102) are connected, the inlet and the working port of the second control valve (104) are connected to transport part of the refrigerant to the indoor heat exchanger (7) and / or the accumulator (201) for condensation, the inlet and the working port of the third control valve (103) are connected, the first outdoor heat exchanger (105) serves as an evaporator, and the second outdoor heat exchanger (107) serves as a condenser; Complete evaporation partition: the return port and the working port of the first control valve (102) are connected, and the inlet and the working port of the second control valve (104) are connected to transport part of the refrigerant to the indoor heat exchanger (7) and / or the accumulator (201) for condensation, the inlet and the working port of the third control valve (103) are connected, the first outdoor heat exchanger (105) serves as an evaporator, and the second outdoor heat exchanger (107) serves as a condenser. The refrigerant condensed in the indoor heat exchanger (7) and / or the accumulator (201) is transported to the first outdoor heat exchanger (105) through the first pipeline (3) for evaporation; Main evaporation partition: the return port and the working port of the first control valve (102) are connected, and the inlet and the working port of the second control valve (104) are connected to transport part of the refrigerant to the indoor heat exchanger (7) and / or the accumulator (201) for condensation. The inlet and the working port of the third control valve (103) are connected, the first outdoor heat exchanger (105) serves as an evaporator, and the second outdoor heat exchanger (107) serves as a condenser. After evaporating in the indoor heat exchanger (7) and / or the accumulator (201), part of the refrigerant is transported to the suction port of the compressor (101) through the third pipeline (5).

17. The control method according to claim 13, characterized in that: The accumulator (201) of the refrigerant circulation system is in at least one of the following multiple working modes: The accumulator (201) serves as an evaporator: the inlet of the first control valve (102) and the working port are connected, the first refrigerant inlet (201a) of the accumulator (201) is in the first state to be connected with the first throttling component (206), and the second refrigerant inlet (201b) of the accumulator (201) is in the fourth state to be connected with the third pipeline (5). The refrigerant compressed by the compressor (101) is condensed by the first outdoor heat exchanger (105) and then throttled by the first throttling component (206). The throttled refrigerant enters the accumulator (201) and evaporates to absorb heat. The evaporated refrigerant discharged from the second refrigerant inlet (201b) of the accumulator (201) is transported to the suction port of the compressor (101) through the third pipeline (5); The accumulator (201) serves as a subcooler: the inlet of the first control valve (102) is connected to the working port, the second refrigerant inlet (201b) of the accumulator (201) is in the fifth state to communicate with the first pipeline (3), the first refrigerant inlet (201a) of the accumulator (201) is in the second state to communicate with the third pipeline (5), the refrigerant compressed by the compressor (101) is condensed by the first outdoor heat exchanger (105) and then throttled by the second throttling component (106), the throttled refrigerant enters the accumulator (201) and evaporates to absorb heat, and the first refrigerant inlet (201a) of the accumulator (201) transports the discharged evaporated refrigerant to the indoor heat exchanger (7) through the first pipeline (3); The accumulator (201) serves as a condenser: the first refrigerant inlet (201a) of the accumulator (201) is in the second state to communicate with the first pipeline (3); the second refrigerant inlet (201b) is in the third state to circulate refrigerant with the second pipeline (4) or the exhaust port of the compressor (101); the refrigerant compressed by the compressor (101) is transported to the accumulator (201) for condensation; the condensed refrigerant is transported to the first pipeline (3) through the first refrigerant inlet (201a) of the accumulator (201); and the first pipeline (3) transports the condensed refrigerant to the indoor heat exchanger (7).

18. The control method according to claim 15, characterized in that: The refrigerant circulation system operates in at least one of the following operating modes: Conventional complete refrigeration: In the conventional complete refrigeration mode, the inlet and the working port of the first control valve (102) are connected, the inlet and the working port of the second control valve (104) are not connected, the inlet and the working port of the third control valve (103) are connected, and the accumulator (201) is turned off, the first switch valve (211) in the first pipeline (3) in parallel with the accumulator (201) is opened, the first outdoor heat exchanger (105) and the second outdoor heat exchanger (107) both serve as condensers, the accumulator (201) is turned off, and the indoor heat exchanger (7) serves as an evaporator; Conventional main body refrigeration: In the conventional main body refrigeration mode, the inlet and the working port of the second control valve (104) are connected to transport part of the compressed refrigerant to the indoor heat exchanger (7) for condensation, and the other part of the refrigerant is condensed in the first outdoor heat exchanger (105) and / or the second outdoor heat exchanger (107). The condensed refrigerant evaporates in the indoor heat exchanger (7). The evaporation amount of the refrigerant in the indoor heat exchanger (7) is greater than the condensation amount. The accumulator (201) is shut down and the first switch valve (211) is opened; Complete cold storage: In the complete cold storage mode, the refrigerant is compressed in the compressor (101), and the compressed refrigerant is completely condensed in the first outdoor heat exchanger (105) and / or the second outdoor heat exchanger (107). The condensed refrigerant evaporates in the accumulator (201), and the accumulator (201) stores cold energy. The indoor unit of the refrigerant circulation system including the indoor heat exchanger (7) is shut down, and the first switch valve (211) is closed. Cold storage and complete refrigeration: In the cold storage and complete refrigeration mode, the refrigerant is compressed in the compressor (101), and the compressed refrigerant is completely condensed in the first outdoor heat exchanger (105) and / or the second outdoor heat exchanger (107). The condensed refrigerant evaporates in the accumulator (201) and the indoor heat exchanger (7), and the first switch valve (211) is opened; Cold storage and simultaneous complete heating with outdoor unit condensation: In the cold storage and simultaneous complete heating and outdoor unit condensation mode, the refrigerant is in the compressor (101), the partially compressed refrigerant is condensed in the first outdoor heat exchanger (105) and / or the second outdoor heat exchanger (107), the partially compressed refrigerant is condensed in the indoor heat exchanger (7), the condensed refrigerant evaporates in the accumulator (201), and the first switch valve (211) is opened; Cold storage and simultaneous complete heating and outdoor unit evaporation: In the cold storage and simultaneous complete heating and outdoor unit evaporation mode, the refrigerant is compressed in the compressor (101), the compressed refrigerant is condensed in the indoor heat exchanger (7), the partially condensed refrigerant is evaporated in the first outdoor heat exchanger (105) and / or the second outdoor heat exchanger (107), the partially condensed refrigerant is evaporated in the accumulator (201), the accumulator (201) stores cold energy, and the first switch valve (211) is opened; Cold storage and main body refrigeration: In the cold storage and main body refrigeration mode, the refrigerant is compressed in the compressor (101), and the partially compressed refrigerant is condensed in the first outdoor heat exchanger (105) and / or the second outdoor heat exchanger (107), and the partially compressed refrigerant is condensed in the indoor heat exchanger (7), and the partially condensed refrigerant evaporates in the accumulator (201), the accumulator (201) stores cold energy, and the partially condensed refrigerant evaporates in the indoor heat exchanger (7), the evaporation amount of the refrigerant in the indoor heat exchanger (7) is greater than the condensation amount, and the first switch valve (211) is opened; Storing cold while the main body is heating and the outdoor unit is evaporating: in the storing cold while the main body is heating and the outdoor unit is evaporating mode, the refrigerant is compressed in the compressor (101), the compressed refrigerant is condensed in the indoor heat exchanger (7), and the partially condensed refrigerant is evaporated in the indoor heat exchanger (7). The evaporation amount of the refrigerant in the indoor heat exchanger (7) is less than the condensation amount. The partially condensed refrigerant is evaporated in the accumulator (201), the accumulator (201) stores cold energy, and the partially condensed refrigerant is evaporated in the first outdoor heat exchanger (105) and / or the second outdoor heat exchanger (107). The first switch valve (211) is opened; Storing cold while the main body is heating and the outdoor unit is condensing: in the storing cold while the main body is heating and the outdoor unit is condensing mode, the refrigerant is compressed in the compressor (101), the partially compressed refrigerant is condensed in the first outdoor heat exchanger (105) and / or the second outdoor heat exchanger (107), the partially compressed refrigerant is condensed in the indoor heat exchanger (7), the partially condensed refrigerant is evaporated in the accumulator (201), the partially condensed refrigerant is evaporated in the indoor heat exchanger (7), and the first switch valve (211) is opened; Supercooling and releasing cold while completely refrigerating: in the supercooling and releasing cold while completely refrigerating mode, the refrigerant is compressed in the compressor (101), and the completely compressed refrigerant is condensed in the first outdoor heat exchanger (105) and / or the second outdoor heat exchanger (107). The condensed refrigerant enters the accumulator (201) for supercooling. The accumulator (201) serves as a supercooler, and the supercooled refrigerant is transported to the indoor heat exchanger (7) for evaporation, and the first switch valve (211) is closed; Supercooling and releasing cooling while the main body is refrigerated: in the supercooling and releasing cooling while the main body is refrigerated mode, the refrigerant is compressed in the compressor (101), and the partially compressed refrigerant is condensed in the first outdoor heat exchanger (105) and / or the second outdoor heat exchanger (107). The condensed refrigerant enters the accumulator (201) for supercooling. The accumulator (201) serves as a supercooler, and the supercooled refrigerant is transported to the indoor heat exchanger (7) for evaporation. The partially compressed refrigerant is condensed in the indoor heat exchanger (7), and the first switch valve (211) is closed. Condensation and cooling while fully cooling: In the condensation and cooling while fully cooling mode, the outdoor unit (1) is turned off, the refrigerant is compressed in the compressor (101), the compressed refrigerant is condensed in the accumulator (201), the accumulator (201) releases cooling capacity, the condensed refrigerant evaporates in the indoor heat exchanger (7), and the first switch valve (211) is closed; Condensation and cooling while the main body is refrigerated: in the condensation and cooling while the main body is refrigerated mode, the outdoor unit (1) is turned off, the refrigerant is compressed in the compressor (101), and the partially compressed refrigerant is condensed in the accumulator (201). The accumulator (201) releases cold energy, and the condensed refrigerant evaporates in the indoor heat exchanger (7). The partially compressed refrigerant is condensed in the indoor heat exchanger (7), and the first switch valve (211) is closed; Parallel cold release and simultaneous complete refrigeration: In the parallel cold release and simultaneous complete refrigeration mode, the refrigerant is compressed in the compressor (101), the partially compressed refrigerant is condensed in the first outdoor heat exchanger (105) and / or the second outdoor heat exchanger (107), the partially compressed refrigerant is condensed in the accumulator (201), the accumulator (201) releases cold energy, the condensed refrigerant evaporates in the indoor heat exchanger (7), and the first switch valve (211) is closed; Parallel cooling and simultaneous main cooling: In the parallel cooling and simultaneous main cooling mode, the refrigerant is compressed in the compressor (101), and the partially compressed refrigerant is condensed in the first outdoor heat exchanger (105) and / or the second outdoor heat exchanger (107), and the partially compressed refrigerant is condensed in the accumulator (201), and the accumulator (201) releases cooling capacity, and the condensed refrigerant evaporates in the indoor heat exchanger (7), and the partially compressed refrigerant is condensed in the indoor heat exchanger (7), and the first switch valve (211) is closed. Wherein, full heating means that the plurality of indoor heat exchangers (7) are all used as condensers for heating. When the main body is heating, the condensation amount of the refrigerant in the indoor heat exchanger (7) is greater than the evaporation amount, and when the main body is cooling, the condensation amount of the refrigerant in the indoor heat exchanger (7) is less than the evaporation amount. When fully heating, the indoor heat exchanger (7) is only used to condense the refrigerant, and when fully cooling, the indoor heat exchanger (7) is only used to evaporate the refrigerant.

19. The control method according to claim 15, characterized in that: The refrigerant circulation system operates in at least one of the following operating modes: Conventional complete heating: In the conventional complete heating mode, the refrigerant is compressed in the compressor (101), the accumulator (201) is shut down, the compressed refrigerant is condensed in the indoor heat exchanger (7), the condensed refrigerant evaporates in the first outdoor heat exchanger (105) and / or the second outdoor heat exchanger (107), the evaporated refrigerant is transported to the air intake of the compressor (101), and the first switch valve (211) in the first pipeline (3) in parallel with the accumulator (201) is opened; Conventional main heating: in the conventional complete main heating mode, the refrigerant is compressed in the compressor (101), the accumulator (201) is shut down, and part of the compressed refrigerant is condensed in the indoor heat exchanger (7). The condensed refrigerant evaporates in the first outdoor heat exchanger (105) and / or the second outdoor heat exchanger (107), and part of the compressed refrigerant is condensed in the indoor heat exchanger, and the first switch valve (211) is opened; Complete heat storage: In the complete heat storage mode, the indoor heat exchanger (7) is closed, the refrigerant is compressed in the compressor (101), the compressed refrigerant is condensed in the accumulator (201), the accumulator (201) stores heat, the condensed refrigerant evaporates in the first outdoor heat exchanger (105) and / or the second outdoor heat exchanger (107), and the first switch valve (211) is opened; Heat storage and simultaneous complete heating: in the heat storage and simultaneous complete heating mode, the refrigerant is compressed in the compressor (101), the compressed refrigerant is condensed in the accumulator (201) and the indoor heat exchanger (7), the condensed refrigerant is evaporated in the first outdoor heat exchanger (105) and / or the second outdoor heat exchanger (107), and the first switch valve (211) is opened; Heat storage and simultaneous complete cooling and outdoor unit evaporation: In the heat storage and simultaneous complete cooling and outdoor unit evaporation mode, the refrigerant is compressed in the compressor (101), the compressed refrigerant is condensed in the accumulator (201), the accumulator (201) stores heat, the partially condensed refrigerant evaporates in the indoor heat exchanger (7), the partially condensed refrigerant evaporates in the first outdoor heat exchanger (105) and / or the second outdoor heat exchanger (107), and the first switch valve (211) is opened; Heat storage and simultaneous complete cooling and outdoor unit condensation: in the heat storage and simultaneous complete cooling and outdoor unit condensation mode, the refrigerant is compressed in the compressor (101), the partially compressed refrigerant is condensed in the first outdoor heat exchanger (105) and / or the second outdoor heat exchanger (107), the partially compressed refrigerant is condensed in the accumulator (201), the condensed refrigerant evaporates in the indoor heat exchanger (7), and the first switch valve (211) is opened; Heat storage and main body heating at the same time: in the heat storage and main body heating mode, the refrigerant is compressed in the compressor (101), the partially compressed refrigerant is condensed in the indoor heat exchanger (7), the indoor heat exchanger (7) generates heat, the partially compressed refrigerant is condensed in the accumulator (201), the accumulator (201) stores heat, the partially condensed refrigerant evaporates in the first outdoor heat exchanger (105) and / or the second outdoor heat exchanger (107), the partially condensed refrigerant evaporates in the indoor heat exchanger (7), and the first switch valve (211) is opened; Heat storage and main body cooling and outdoor unit condensing: in the heat storage and main body cooling and outdoor unit condensing mode, the refrigerant is compressed in the compressor (101), the partially compressed refrigerant is condensed in the first outdoor heat exchanger (105) and / or the second outdoor heat exchanger (107), the partially compressed refrigerant is condensed in the accumulator (201), the condensed refrigerant evaporates in the indoor heat exchanger (7), the partially compressed refrigerant evaporates in the indoor heat exchanger (7), the evaporation amount of the refrigerant in the outdoor unit is less than the condensation amount of the refrigerant, the evaporation amount of the refrigerant in the indoor heat exchanger (7) is greater than the condensation amount of the refrigerant, and the first switch valve (211) is opened; Heat storage and main body cooling and outdoor unit evaporation: in the heat storage and main body cooling and outdoor unit evaporation mode, the refrigerant is compressed in the compressor (101), and the partially compressed refrigerant is condensed in the first outdoor heat exchanger (105) and / or the second outdoor heat exchanger (107), and the partially compressed refrigerant is condensed in the accumulator (201), and the condensed refrigerant evaporates in the indoor heat exchanger (7), and the partially compressed refrigerant evaporates in the indoor heat exchanger (7), the evaporation amount of the refrigerant in the outdoor unit (1) is greater than the condensation amount of the refrigerant, the evaporation amount of the refrigerant in the indoor heat exchanger (7) is greater than the condensation amount of the refrigerant, and the first switch valve (211) is opened; Mixed heat release and simultaneous complete heating: in the mixed heat release and simultaneous complete heating mode, the refrigerant is compressed in the compressor (101), the compressed refrigerant is condensed in the indoor heat exchanger (7), and the partially condensed refrigerant evaporates in the accumulator (201). The accumulator (201) releases heat, and the partially condensed refrigerant evaporates in the first outdoor heat exchanger (105) and / or the second outdoor heat exchanger (107), and the first switch valve (211) is opened; Mixed heat release and simultaneous main heating: in the mixed heat release and simultaneous main heating mode, the refrigerant is compressed in the compressor (101), the compressed refrigerant is condensed in the indoor heat exchanger (7), and the partially condensed refrigerant evaporates in the accumulator (201). The accumulator (201) releases heat, and the partially condensed refrigerant evaporates in the first outdoor heat exchanger (105) and / or the second outdoor heat exchanger (107), and the first switch valve (211) is opened; Independent heat release and simultaneous complete heating: In the independent heat release and simultaneous complete heating mode, the first outdoor heat exchanger (105) and the second outdoor heat exchanger (107) are closed, the refrigerant is compressed in the compressor (101), the compressed refrigerant is condensed in the indoor heat exchanger (7), the condensed refrigerant evaporates in the accumulator (201), the accumulator (201) releases heat, and the first switch valve (211) is opened; Independent heat release and simultaneous main heating: in the independent heat release and simultaneous main heating mode, the first outdoor heat exchanger (105) and the second outdoor heat exchanger (107) are closed, the refrigerant is compressed in the compressor (101), the compressed refrigerant is condensed in the indoor heat exchanger (7), part of the condensed refrigerant evaporates in the accumulator (201), the accumulator (201) releases heat, part of the condensed refrigerant evaporates in the indoor heat exchanger (7), and the first switch valve (211) is opened; Wherein, full heating means that the plurality of indoor heat exchangers (7) are all used as condensers for heating, and full cooling means that the plurality of indoor heat exchangers (7) are all used as evaporators for cooling. When the main body is heating, the condensation amount of the refrigerant in the indoor heat exchanger (7) is greater than the evaporation amount, and when the main body is cooling, the condensation amount of the refrigerant in the indoor heat exchanger (7) is less than the evaporation amount. When fully heating, the indoor heat exchanger (7) is only used to condense the refrigerant, and when fully cooling, the indoor heat exchanger (7) is only used to evaporate the refrigerant.

20. The control method according to claim 15, characterized in that: The refrigerant circulation system operates in at least one of the following operating modes: Non-zoned discontinuous heating and defrosting: in the non-zoned discontinuous heating and defrosting mode, the indoor heat exchanger (7) is closed, the refrigerant is compressed in the compressor (101), the compressed refrigerant is condensed in the first outdoor heat exchanger (105) and the second outdoor heat exchanger (107) to defrost the first outdoor heat exchanger (105) and the second outdoor heat exchanger (107), the condensed refrigerant evaporates in the accumulator (201), the accumulator (201) releases heat, and the first switch valve (211) in a section of the first pipeline (3) connected in parallel with the accumulator (201) is closed; Partitioned discontinuous heating and defrosting: In the partitioned discontinuous heating and defrosting mode, one of the first outdoor heat exchanger (105) and the second outdoor heat exchanger (107) is used as a condenser to achieve defrosting, and the other is used as an evaporator. The refrigerant compressed by the compressor (101) is condensed in one of the first outdoor heat exchanger (105) and the second outdoor heat exchanger (107). The condensed refrigerant evaporates in the accumulator (201), the accumulator (201) releases heat, and the first switch valve (211) is closed. Non-zoned continuous heating, defrosting and complete heating: in the non-zoned continuous heating, defrosting and complete heating mode, the refrigerant is compressed in the compressor (101), the partially compressed refrigerant is condensed in the first outdoor heat exchanger (105) and / or the second outdoor heat exchanger (107), the partially compressed refrigerant is condensed in the indoor heat exchanger (7), the condensed refrigerant evaporates in the accumulator (201), the accumulator (201) releases heat, and the first switch valve (211) is opened; Non-partitioned continuous heating and defrosting and main heating: in the non-partitioned continuous heating and defrosting and main heating mode, the refrigerant is compressed in the compressor (101), the partially compressed refrigerant is condensed in the first outdoor heat exchanger (105) and / or the second outdoor heat exchanger (107), the partially compressed refrigerant is condensed in the indoor heat exchanger (7), the partially condensed refrigerant evaporates in the accumulator (201), the accumulator (201) releases heat, the partially condensed refrigerant evaporates in the indoor heat exchanger (7), the evaporation amount of the refrigerant in the indoor heat exchanger (7) is less than the condensation amount, and the first switch valve (211) is opened; Non-partitioned continuous heating and defrosting with main body cooling: in the non-partitioned continuous heating and defrosting with main body cooling mode, the refrigerant is compressed in the compressor (101), the partially compressed refrigerant is condensed in the first outdoor heat exchanger (105) and / or the second outdoor heat exchanger (107), the partially compressed refrigerant is condensed in the indoor heat exchanger (7), the partially condensed refrigerant evaporates in the accumulator (201), the accumulator (201) releases heat, the partially condensed refrigerant evaporates in the indoor heat exchanger (7), the evaporation amount of the refrigerant in the indoor heat exchanger (7) is greater than the condensation amount, and the first switch valve (211) is opened; Partitioned continuous heating and defrosting, complete heating, and outdoor unit condensation: in the partitioned continuous heating and defrosting, complete heating, and outdoor unit condensation mode, the refrigerant is compressed in the compressor (101), the partially compressed refrigerant is condensed in one of the first outdoor heat exchanger (105) and the second outdoor heat exchanger (107), the partially compressed refrigerant is condensed in the indoor heat exchanger (7), the condensed refrigerant evaporates in the accumulator (201) and the other of the first outdoor heat exchanger (105) and the second outdoor heat exchanger (107), the accumulator (201) releases heat, and the first switch valve (211) is opened; Partitioned continuous heating and defrosting and main heating outdoor unit condensing: in the partitioned continuous heating and defrosting and main heating outdoor unit condensing mode, the refrigerant is compressed in the compressor (101), the partially compressed refrigerant is condensed in one of the first outdoor heat exchanger (105) and the second outdoor heat exchanger (107), the partially compressed refrigerant is condensed in the indoor heat exchanger (7), the condensed refrigerant evaporates in the indoor heat exchanger (7), the accumulator (201), and the other of the first outdoor heat exchanger (105) and the second outdoor heat exchanger (107), the accumulator (201) releases heat, the evaporation amount of the refrigerant in the indoor heat exchanger (7) is less than the condensation amount, and the first switch valve (211) is opened; Partitioned continuous heating and defrosting and main refrigeration outdoor unit condensing: in the partitioned continuous heating and defrosting and main refrigeration outdoor unit condensing mode, the refrigerant is compressed in the compressor (101), and the partially compressed refrigerant is condensed in one of the first outdoor heat exchanger (105) and the second outdoor heat exchanger (107), and the partially compressed refrigerant is condensed in the indoor heat exchanger (7). The condensed refrigerant evaporates in the indoor heat exchanger (7), the accumulator (201), and the other of the first outdoor heat exchanger (105) and the second outdoor heat exchanger (107), and the accumulator (201) releases heat. The evaporation amount of the refrigerant in the indoor heat exchanger (7) is greater than the condensation amount, and the first switch valve (211) is opened; Partitioned continuous heating and defrosting, complete heating, and outdoor unit evaporation: in the partitioned continuous heating and defrosting, complete heating, and outdoor unit evaporation mode, the refrigerant is compressed in the compressor (101), the partially compressed refrigerant is condensed in one of the first outdoor heat exchanger (105) and the second outdoor heat exchanger (107), the partially compressed refrigerant is condensed in the indoor heat exchanger (7), the condensed refrigerant is evaporated in the accumulator (201) and the other of the first outdoor heat exchanger (105) and the second outdoor heat exchanger (107), the accumulator (201) releases heat, and the first switch valve (211) is opened; Partitioned continuous heating and defrosting and main heating outdoor unit evaporation: in the partitioned continuous heating and defrosting and main heating outdoor unit evaporation mode, the refrigerant is compressed in the compressor (101), the partially compressed refrigerant is condensed in one of the first outdoor heat exchanger (105) and the second outdoor heat exchanger (107), the partially compressed refrigerant is condensed in the indoor heat exchanger (7), the condensed refrigerant is evaporated in the indoor heat exchanger (7), the accumulator (201), and the other of the first outdoor heat exchanger (105) and the second outdoor heat exchanger (107), the accumulator (201) releases heat, the evaporation amount of the refrigerant in the indoor heat exchanger (7) is less than the condensation amount, and the first switch valve (211) is opened; Partitioned continuous heating and defrosting and evaporation of the main refrigeration outdoor unit: In the partitioned continuous heating and defrosting and evaporation mode of the main refrigeration outdoor unit, the refrigerant is compressed in the compressor (101), and the partially compressed refrigerant is condensed in one of the first outdoor heat exchanger (105) and the second outdoor heat exchanger (107), and the partially compressed refrigerant is condensed in the indoor heat exchanger (7). The condensed refrigerant evaporates in the indoor heat exchanger (7), the accumulator (201), and the other of the first outdoor heat exchanger (105) and the second outdoor heat exchanger (107), and the accumulator (201) releases heat. The evaporation amount of the refrigerant in the indoor heat exchanger (7) is greater than the condensation amount, and the first switch valve (211) is opened. Wherein, full heating means that the plurality of indoor heat exchangers (7) are all used as condensers for heating, and full cooling means that the plurality of indoor heat exchangers (7) are all used as evaporators for cooling. When the main body is heating, the condensation amount of the refrigerant in the indoor heat exchanger (7) is greater than the evaporation amount, and when the main body is cooling, the condensation amount of the refrigerant in the indoor heat exchanger (7) is less than the evaporation amount. When fully heating, the indoor heat exchanger (7) is only used to condense the refrigerant, and when fully cooling, the indoor heat exchanger (7) is only used to evaporate the refrigerant.

21. The control method according to claim 15, characterized in that: The refrigerant circulation system operates in at least one of the following operating modes: Conventional heat recovery: In the conventional heat recovery mode, the first outdoor heat exchanger (105) and the second outdoor heat exchanger (107) are shut down, the accumulator (201) is shut down, the refrigerant is compressed in the compressor (101), the compressed refrigerant is condensed in part of the indoor heat exchanger (7), the condensed refrigerant is evaporated in another part of the indoor heat exchanger (7), and the first switch valve (211) in a section of the first pipeline (3) connected in parallel with the accumulator (201) is closed; Cold storage and heat recovery: In the cold storage and heat recovery mode, the first outdoor heat exchanger (105) and the second outdoor heat exchanger (107) are shut down, the refrigerant is compressed in the compressor (101), the compressed refrigerant is condensed in part of the indoor heat exchanger (7), and the condensed refrigerant is evaporated in another part of the indoor heat exchanger (7) and the accumulator (201), the accumulator (201) stores cold energy, the evaporation amount of the refrigerant in the indoor heat exchanger (7) is less than the condensation amount, and the first switch valve (211) is closed; Heat storage and heat recovery: In the heat storage and heat recovery mode, the first outdoor heat exchanger (105) and the second outdoor heat exchanger (107) are shut down, the refrigerant is compressed in the compressor (101), and the compressed refrigerant is condensed in the accumulator (201) and part of the indoor heat exchanger (7). The accumulator (201) stores heat, and the condensed refrigerant evaporates in another part of the indoor heat exchanger (7). The evaporation amount of the refrigerant in the indoor heat exchanger (7) is greater than the condensation amount, and the first switch valve (211) is closed; Releasing cooling while recovering heat: In the releasing cooling while recovering heat mode, the first outdoor heat exchanger (105) and the second outdoor heat exchanger (107) are shut down, the refrigerant is compressed in the compressor (101), the compressed refrigerant is condensed in the accumulator (201) and part of the indoor heat exchanger (7), the accumulator (201) releases cooling capacity, and the condensed refrigerant evaporates in another part of the indoor heat exchanger (7), the evaporation amount of the refrigerant in the indoor heat exchanger (7) is greater than the condensation amount, and the first switch valve (211) is closed; Heat release and heat recovery at the same time: in the heat release and heat recovery mode, the first outdoor heat exchanger (105) and the second outdoor heat exchanger (107) are shut down, the refrigerant is compressed in the compressor (101), the compressed refrigerant is condensed in part of the indoor heat exchanger (7), the condensed refrigerant evaporates in another part of the indoor heat exchanger (7) and the accumulator (201), the accumulator (201) releases heat, the evaporation amount of the refrigerant in the indoor heat exchanger (7) is less than the condensation amount, and the first switch valve (211) is closed.

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