Air conditioning system and control method and control device therefor

Abstract

The present application relates to an air conditioning system and a control method and control device thereof, wherein the air conditioning system comprises a compressor (101), an outdoor heat exchanger (105), an indoor heat exchanger (301), an accumulator (201) and a valve assembly, the first end of the accumulator (201) is communicated with the exhaust port of the compressor (101) and the outdoor heat exchanger (105) respectively, the second end of the accumulator (201) is communicated with the gas inlet of the compressor (101) and the indoor heat exchanger (301) respectively; the valve assembly is connected with the compressor (101), the outdoor heat exchanger (105), the indoor heat exchanger (301) and the accumulator (201), the valve assembly is configured to control the flow direction of refrigerant and / or the on-off of the connecting pipeline, so as to adjust the state of the accumulator (201), and realize the switching of the air conditioning system between different working modes, the state of the accumulator (201) includes non-working state, cold storage state, cold release state, heat storage state and heat release state.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and in particular to an air conditioning system and its control method and control device. Background Technology

[0002] Defrosting during heating in multi-split air conditioners is a common problem in the air conditioning industry today. Frequent defrosting leads to poor overall heating performance, and the indoor temperature drops during the defrosting process, resulting in poor user comfort.

[0003] To address the defrosting issue during air conditioning heating, numerous solutions have been developed. Among them, systems incorporating heat storage modules for defrosting are gaining popularity in the air conditioning industry. These systems store heat during heating and release it during defrosting, thereby reducing indoor temperature fluctuations. However, the operation of heat storage modules is relatively limited, failing to meet diverse user needs. Furthermore, their complex piping design leads to a poor user experience.

[0004] It should be noted that the information disclosed in the background section of this invention is intended only to enhance the understanding of the overall background of this invention, and should not be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art. Summary of the Invention

[0005] This invention provides an air conditioning system and its control method and device, solving the problem that air conditioning systems in related technologies cannot meet the diverse needs of users.

[0006] According to a first aspect of the present invention, an air conditioning system is provided, comprising:

[0007] compressor;

[0008] Outdoor heat exchanger;

[0009] Indoor heat exchanger;

[0010] The accumulator has its first end connected to the exhaust ports of both the outdoor heat exchanger and the compressor, and its second end connected to the air inlets of both the indoor heat exchanger and the compressor.

[0011] The valve assembly is connected to the compressor, outdoor heat exchanger, indoor heat exchanger and accumulator. The valve assembly is configured to control the flow of refrigerant and / or the opening and closing of connecting pipes to regulate the state of the accumulator and realize the switching of the air conditioning system between different operating modes. The state of the accumulator includes non-operating state, cold storage state, cold release state, heat storage state and heat release state.

[0012] In some embodiments, the valve assembly includes a first control valve and a first throttling element, which are connected in parallel between a first end of the accumulator and an outdoor heat exchanger.

[0013] In some embodiments, the valve assembly includes a second control valve disposed on a connecting pipe between the indoor heat exchanger and a first connection point, the first connection point being located on a pipe connecting the outdoor heat exchanger to the first control valve and a first throttling element.

[0014] In some embodiments, the valve assembly includes a third control valve disposed on a connecting line between the first end of the accumulator and the exhaust port of the compressor.

[0015] In some embodiments, the valve assembly includes a fourth control valve disposed on a connecting line between the second end of the accumulator and the air inlet of the compressor.

[0016] In some embodiments, the valve assembly includes a second throttling element, a first end of which is connected to a second end of an accumulator, and a second end of which is connected to an indoor heat exchanger and an outdoor heat exchanger, respectively.

[0017] In some embodiments, the valve assembly includes a third throttling element disposed on the connecting pipe between the outdoor heat exchanger and the indoor heat exchanger.

[0018] In some embodiments, the valve assembly includes a four-way valve, which includes a first port, a second port, a third port and a fourth port. The first port is connected to the exhaust port of the compressor, the second port is connected to the outdoor heat exchanger, the third port is connected to the air inlet of the compressor, and the fourth port is connected to the indoor heat exchanger.

[0019] In some embodiments, the air conditioning system further includes a subcooler disposed between the outdoor heat exchanger and the indoor heat exchanger, and the subcooler is connected to the air inlet of the compressor.

[0020] In some embodiments, the valve assembly includes a first control valve, a second control valve, a third control valve, a fourth control valve, a first throttling element, a second throttling element, a third throttling element, and a four-way valve. The first control valve and the first throttling element are connected in parallel between a first end of the accumulator and a first connection point. The first connection point is connected to an outdoor heat exchanger. The second control valve is disposed on a connecting pipe between the first connection point and an indoor heat exchanger. The third control valve is disposed on a connecting pipe between the first end of the accumulator and the exhaust port of the compressor. The fourth control valve is disposed on a connecting pipe between the second end of the accumulator and the inlet of the compressor. The first end of the second throttling element is connected to the second end of the accumulator. The second end of the second throttling element is connected to both the indoor heat exchanger and the outdoor heat exchanger. The third throttling element is disposed on a connecting pipe between the outdoor heat exchanger and the first connection point. The four-way valve includes a first interface, a second interface, a third interface, and a fourth interface. The first interface is connected to the exhaust port of the compressor. The second interface is connected to the outdoor heat exchanger. The third interface is connected to the inlet of the compressor. The fourth interface is connected to the indoor heat exchanger.

[0021] According to a second aspect of the present invention, a control method based on the above-described air conditioning system is provided, comprising:

[0022] Determine the operating mode of the air conditioning system;

[0023] The system controls the valve components and accumulator status in the air conditioning system according to the preset control strategy and based on the working mode.

[0024] In some embodiments, determining the operating mode of the air conditioning system includes:

[0025] During periods of high electricity prices in the power supply system, the operating mode of the air conditioning system is determined to be either the mode in which the corresponding energy storage device is in a non-working state, a state of releasing cooling capacity, or a state of releasing heat capacity.

[0026] During periods of low electricity prices in the power supply system, the operating mode of the air conditioning system is determined to be either the non-operating state of the corresponding energy storage device, the state of storing cold energy, or the state of storing heat energy.

[0027] In some embodiments, determining the operating mode of the air conditioning system includes:

[0028] Check if there is energy stored in the energy storage device;

[0029] The operating mode of the air conditioning system is determined based on the test results.

[0030] According to a third aspect of the present invention, a control method for an air conditioning system based on the above-described method is provided, comprising:

[0031] Determine the operating mode of the air conditioning system;

[0032] According to the preset control strategy and based on the working mode, the operation of the first control valve, second control valve, third control valve, fourth control valve, first throttling element, second throttling element, third throttling element and four-way valve in the air conditioning system, as well as the status of the outdoor heat exchanger, indoor heat exchanger and accumulator, are controlled.

[0033] In some embodiments, controlling the operation of the first control valve, second control valve, third control valve, fourth control valve, first throttling element, second throttling element, third throttling element, and four-way valve in the air conditioning system, as well as the state of the outdoor heat exchanger, indoor heat exchanger, and accumulator, according to a preset control strategy and based on the operating mode, includes:

[0034] When the working mode is the normal cooling mode, the four-way valve is de-energized, the first interface is connected to the second interface, and the third interface is connected to the fourth interface.

[0035] The second control valve is opened, while the first, third, and fourth control valves are all closed; and

[0036] The first and second throttling elements are both in the closed state, while the third throttling element is in the open state and the opening size is adjustable.

[0037] The indoor heat exchanger is used as an evaporator, the outdoor heat exchanger is used as a condenser, and the accumulator is turned off.

[0038] In some embodiments, controlling the operation of the first control valve, second control valve, third control valve, fourth control valve, first throttling element, second throttling element, third throttling element, and four-way valve in the air conditioning system, as well as the state of the outdoor heat exchanger, indoor heat exchanger, and accumulator, according to a preset control strategy and based on the operating mode, includes:

[0039] When the working mode is full cold storage mode, the four-way valve is de-energized, the first interface is connected to the second interface, and the third interface is connected to the fourth interface.

[0040] The fourth control valve is opened, while the first, third, and second control valves are all closed; and

[0041] The first and third throttling elements are controlled to be in the open state with adjustable opening sizes, while the second throttling element is in the closed state.

[0042] The indoor heat exchanger is shut down, the outdoor heat exchanger is used as a condenser, and the accumulator is used as an evaporator.

[0043] In some embodiments, controlling the operation of the first control valve, second control valve, third control valve, fourth control valve, first throttling element, second throttling element, third throttling element, and four-way valve in the air conditioning system, as well as the state of the outdoor heat exchanger, indoor heat exchanger, and accumulator, according to a preset control strategy and based on the operating mode, includes:

[0044] When the working mode is refrigeration and cold storage mode, the four-way valve is de-energized, the first interface is connected to the second interface, and the third interface is connected to the fourth interface.

[0045] Control the fourth and second control valves to open, and the first and third control valves to close; and

[0046] The first and third throttling elements are controlled to be in the open state with adjustable opening sizes, while the second throttling element is in the closed state.

[0047] The indoor heat exchanger is used as an evaporator, the outdoor heat exchanger is used as a condenser, and the accumulator is used as an evaporator.

[0048] In some embodiments, controlling the operation of the first control valve, second control valve, third control valve, fourth control valve, first throttling element, second throttling element, third throttling element, and four-way valve in the air conditioning system, as well as the state of the outdoor heat exchanger, indoor heat exchanger, and accumulator, according to a preset control strategy and based on the operating mode, includes:

[0049] When the working mode is subcooling and releasing the coolant, the four-way valve is de-energized, and the first interface is connected to the second interface, and the third interface is connected to the fourth interface.

[0050] Controls the first control valve to open, and the third, fourth, and second control valves to close; and

[0051] The first throttling element is controlled to be closed, while the second and third throttling elements are controlled to be open and their opening sizes are adjustable.

[0052] The indoor heat exchanger is used as an evaporator, the outdoor heat exchanger is used as a condenser, and the accumulator is used as a subcooler.

[0053] In some embodiments, controlling the operation of the first control valve, second control valve, third control valve, fourth control valve, first throttling element, second throttling element, third throttling element, and four-way valve in the air conditioning system, as well as the state of the outdoor heat exchanger, indoor heat exchanger, and accumulator, according to a preset control strategy and based on the operating mode, includes:

[0054] When the working mode is condensation and cooling mode, the four-way valve is de-energized, the first interface is connected to the second interface, and the third interface is connected to the fourth interface.

[0055] Control the third control valve to open, and the first, fourth, and second control valves to close; and

[0056] The first and third throttling elements are controlled to be closed, while the second throttling element is open and its opening size is adjustable.

[0057] The indoor heat exchanger is used as an evaporator, the outdoor heat exchanger is turned off, and the accumulator is used as a condenser.

[0058] In some embodiments, controlling the operation of the first control valve, second control valve, third control valve, fourth control valve, first throttling element, second throttling element, third throttling element, and four-way valve in the air conditioning system, as well as the state of the outdoor heat exchanger, indoor heat exchanger, and accumulator, according to a preset control strategy and based on the operating mode, includes:

[0059] When the working mode is parallel cooling mode, the four-way valve is de-energized, the first interface is connected to the second interface, and the third interface is connected to the fourth interface.

[0060] Control the third and second control valves to open, and the first and fourth control valves to close; and

[0061] The first throttling element is controlled to be closed, while the second and third throttling elements are both open and their opening sizes are adjustable.

[0062] The indoor heat exchanger is used as an evaporator, while the outdoor heat exchanger and accumulator are both used as condensers.

[0063] In some embodiments, controlling the operation of the first control valve, second control valve, third control valve, fourth control valve, first throttling element, second throttling element, third throttling element, and four-way valve in the air conditioning system, as well as the state of the outdoor heat exchanger, indoor heat exchanger, and accumulator, according to a preset control strategy and based on the operating mode, includes:

[0064] When the working mode is the normal heating mode, the four-way valve is energized, the first port is connected to the fourth port, and the second port is connected to the third port.

[0065] Control the second control valve to open, and the first, third, and fourth control valves to close; and

[0066] The first and second throttling elements are controlled to be closed, while the third throttling element is open and its opening size is adjustable.

[0067] The indoor heat exchanger is used as a condenser, the outdoor heat exchanger is used as an evaporator, and the accumulator is turned off.

[0068] In some embodiments, controlling the operation of the first control valve, second control valve, third control valve, fourth control valve, first throttling element, second throttling element, third throttling element, and four-way valve in the air conditioning system, as well as the state of the outdoor heat exchanger, indoor heat exchanger, and accumulator, according to a preset control strategy and based on the operating mode, includes:

[0069] When the working mode is full heat storage mode, the four-way valve is energized, the first port is connected to the fourth port, and the second port is connected to the third port.

[0070] Control the third and second control valves to open, and the first and fourth control valves to close; and

[0071] The first throttling element is controlled to be closed, while the second and third throttling elements are controlled to be open and their opening sizes are adjustable.

[0072] The indoor heat exchanger is shut down, the outdoor heat exchanger is used as an evaporator, and the accumulator is used as a condenser.

[0073] In some embodiments, controlling the operation of the first control valve, second control valve, third control valve, fourth control valve, first throttling element, second throttling element, third throttling element, and four-way valve in the air conditioning system, as well as the state of the outdoor heat exchanger, indoor heat exchanger, and accumulator, according to a preset control strategy and based on the operating mode, includes:

[0074] When the working mode is heating and heat storage mode, the four-way valve is energized, the first interface is connected to the fourth interface, and the second interface is connected to the third interface.

[0075] Control the third and second control valves to open, and the first and fourth control valves to close; and

[0076] The first throttling element is controlled to be closed, while the second and third throttling elements are controlled to be open and their opening sizes are adjustable.

[0077] The indoor heat exchanger is used as a condenser, the outdoor heat exchanger is used as an evaporator, and the accumulator is used as a condenser.

[0078] In some embodiments, controlling the operation of the first control valve, second control valve, third control valve, fourth control valve, first throttling element, second throttling element, third throttling element, and four-way valve in the air conditioning system, as well as the state of the outdoor heat exchanger, indoor heat exchanger, and accumulator, according to a preset control strategy and based on the operating mode, includes:

[0079] When the working mode is the mixed heat release mode, the four-way valve is energized, and the first port is connected to the fourth port, and the second port is connected to the third port.

[0080] Control the fourth and second control valves to open, and the first and third control valves to close; and

[0081] The first and third throttling elements are both in the open state and their opening sizes are adjustable, while the second throttling element is in the closed state;

[0082] The indoor heat exchanger is used as a condenser, the outdoor heat exchanger is used as an evaporator, and the accumulator is used as an evaporator.

[0083] In some embodiments, controlling the operation of the first control valve, second control valve, third control valve, fourth control valve, first throttling element, second throttling element, third throttling element, and four-way valve in the air conditioning system, as well as the state of the outdoor heat exchanger, indoor heat exchanger, and accumulator, according to a preset control strategy and based on the operating mode, includes:

[0084] When the working mode is independent heat release mode, the four-way valve is energized, the first port is connected to the fourth port, and the second port is connected to the third port.

[0085] Control the fourth and second control valves to open, and the first and third control valves to close; and

[0086] The first throttling element is controlled to be in the open state with an adjustable opening size, while the second and third throttling elements are both in the closed state;

[0087] The indoor heat exchanger is used as a condenser, the outdoor heat exchanger is turned off, and the accumulator is used as an evaporator.

[0088] In some embodiments, controlling the operation of the first control valve, second control valve, third control valve, fourth control valve, first throttling element, second throttling element, third throttling element, and four-way valve in the air conditioning system, as well as the state of the outdoor heat exchanger, indoor heat exchanger, and accumulator, according to a preset control strategy and based on the operating mode, includes:

[0089] When the working mode is defrosting mode, the four-way valve is de-energized, the first interface is connected to the second interface, and the third interface is connected to the fourth interface.

[0090] The fourth control valve is opened, while the first, third, and second control valves are all closed; and

[0091] The first and third throttling elements are controlled to be in the open state with adjustable opening sizes, while the second throttling element is in the closed state.

[0092] The indoor heat exchanger is shut down, the outdoor heat exchanger is used as a condenser, and the accumulator is used as an evaporator.

[0093] According to a fourth aspect of the present invention, a control device for an air conditioning system is provided, comprising:

[0094] The memory is configured to store instructions;

[0095] The processor is coupled to the memory, and the processor is configured to implement the control method described above based on the execution of instructions stored in the memory.

[0096] According to a fifth aspect of the present invention, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions that, when executed by a processor, implement the control method described above.

[0097] Based on the above technical solution, the embodiments of the present invention can change the flow direction of the refrigerant and / or adjust the on / off state of the connecting pipe by operating the valve assembly, thereby adjusting the state of the accumulator and realizing the switching of the air conditioning system between multiple different working modes. Moreover, the accumulator has non-working state, cold storage state, cold release state, heat storage state, and heat release state, that is, the accumulator can participate in operation or not. When participating in operation, it can both store and release cold; it can both store and release heat, thus better meeting the diverse needs of users and improving the user experience. Attached Figure Description

[0098] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0099] Figure 1 This is a schematic diagram of the structure of some embodiments of the air conditioning system of the present invention.

[0100] Figure 2 This is a schematic diagram of refrigerant flow in conventional cooling mode for some embodiments of the air conditioning system of the present invention.

[0101] Figure 3 This is a schematic diagram of refrigerant flow in full cold storage mode in some embodiments of the air conditioning system of the present invention.

[0102] Figure 4 This is a schematic diagram of refrigerant flow in some embodiments of the air conditioning system of the present invention in the refrigeration and cold storage mode.

[0103] Figure 5 This is a schematic diagram of refrigerant flow in the subcooling release mode of some embodiments of the air conditioning system of the present invention.

[0104] Figure 6 This is a schematic diagram of refrigerant flow in the condensation and cooling mode of some embodiments of the air conditioning system of the present invention.

[0105] Figure 7 This is a schematic diagram of refrigerant flow in parallel cooling mode in some embodiments of the air conditioning system of the present invention.

[0106] Figure 8 This is a schematic diagram of refrigerant flow in conventional heating mode for some embodiments of the air conditioning system of the present invention.

[0107] Figure 9 This is a schematic diagram of refrigerant flow in full heat storage mode in some embodiments of the air conditioning system of the present invention.

[0108] Figure 10This is a schematic diagram of refrigerant flow in heating and heat storage mode in some embodiments of the air conditioning system of the present invention.

[0109] Figure 11 This is a schematic diagram of refrigerant flow in a mixed heat release mode in some embodiments of the air conditioning system of the present invention.

[0110] Figure 12 This is a schematic diagram of refrigerant flow in independent heat release mode in some embodiments of the air conditioning system of the present invention.

[0111] Figure 13 This is a schematic diagram of refrigerant flow in defrosting mode in some embodiments of the air conditioning system of the present invention.

[0112] In the picture:

[0113] 1. Outdoor unit; 2. Energy storage equipment; 3. Liquid-side main pipe; 4. Gas-side main pipe;

[0114] 101. Compressor; 102. Oil separator; 103. Check valve; 104. Four-way valve; 105. Outdoor heat exchanger; 106. Third throttling element; 107. Fourth throttling element; 108. Fifth control valve; 109. Subcooler; 110. Gas-liquid separator;

[0115] 201. Accumulator; 202. First gas pipe; 203. Second gas pipe; 204. First liquid pipe; 205. Second liquid pipe; 206. First throttling device; 207. First control valve; 208. Third control valve; 209. Second throttling device; 210. Fourth control valve; 211. Second control valve;

[0116] 301. Indoor heat exchanger. Detailed Implementation

[0117] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0118] In the description of this invention, it should be understood that the terms "center," "lateral," "longitudinal," "front," "rear," "left," "right," "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this invention.

[0119] like Figure 1 As shown, in some embodiments of the air conditioning system provided by the present invention, the air conditioning system includes a compressor 101, an outdoor heat exchanger 105, an indoor heat exchanger 301, an accumulator 201, and a valve assembly. The first end of the accumulator 201 is connected to the exhaust ports of the outdoor heat exchanger 105 and the compressor 101, respectively, and the second end of the accumulator 201 is connected to the air inlets of the indoor heat exchanger 301 and the compressor 101, respectively. The valve assembly is connected to the compressor 101, the outdoor heat exchanger 105, the indoor heat exchanger 301, and the accumulator 201. The valve assembly is configured to control the flow direction of the refrigerant and / or the opening and closing of the connecting pipes to adjust the state of the accumulator 201 and realize the switching of the air conditioning system between different working modes. The state of the accumulator 201 includes a non-working state, a cold energy storage state, a cold energy release state, a heat energy storage state, and a heat energy release state.

[0120] In the above embodiments, by operating the valve assembly, the flow direction of the refrigerant and / or the on / off state of the connecting pipes can be changed to adjust the state of the accumulator and realize the switching of the air conditioning system between multiple different operating modes. Moreover, the accumulator 201 has a non-working state, a cold energy storage state, a cold energy release state, a heat energy storage state, and a heat energy release state. That is, the accumulator can participate in operation or not. When participating in operation, it can both store and release cold energy, and it can both store and release heat energy. Therefore, it can better meet the diverse needs of users and improve the user experience.

[0121] like Figure 1 As shown, in some embodiments, the valve assembly includes a first control valve 207 and a first throttling element 206, which are connected in parallel between the first end of the accumulator 201 and the outdoor heat exchanger 105.

[0122] By setting a first control valve 207 and a first throttling element 206 connected in parallel, two connection methods can be realized between the first end of the outdoor heat exchanger 105 and the first end of the accumulator 201. When the outdoor heat exchanger 105 and the first end of the accumulator 201 are connected through the first control valve 207, the refrigerant flowing out of the outdoor heat exchanger 105 can directly enter the accumulator 201 in an outflow state, and the refrigerant can achieve further subcooling in the accumulator 201. When the outdoor heat exchanger 105 and the first end of the accumulator 201 are connected through the first throttling element 206, the refrigerant flowing out of the outdoor heat exchanger 105 can flow into the accumulator 201 after throttling, so as to achieve the purpose of cold storage.

[0123] In some embodiments, the valve assembly includes a second control valve 211 disposed on a connecting pipe between the indoor heat exchanger 301 and a first connection point, the first connection point being located on a pipe connecting the outdoor heat exchanger 105 to the first control valve 207 and the first throttling element 206.

[0124] By setting the second control valve 211, the connection between the indoor heat exchanger 301 and the first connection point can be switched on and off. The first connection point is connected to the outdoor heat exchanger 105, so the connection between the indoor heat exchanger 301 and the outdoor heat exchanger 105 and the connection between the indoor heat exchanger 301 and the accumulator 201 can be switched on and off.

[0125] In some embodiments, the valve assembly includes a third control valve 208 disposed on a connecting line between the first end of the accumulator 201 and the exhaust port of the compressor 101.

[0126] By setting a third control valve 208, the connection between the first end of the accumulator 201 and the exhaust port of the compressor 101 can be switched on or off. When the first end of the accumulator 201 is connected to the exhaust port of the compressor 101, the exhaust gas from the compressor 101 can directly enter the accumulator 201, realizing the heat storage function of the accumulator 201.

[0127] In some embodiments, the valve assembly includes a fourth control valve 210 disposed on a connecting line between the second end of the accumulator 201 and the air inlet of the compressor 101.

[0128] By setting the fourth control valve 210, the connection between the second end of the accumulator 201 and the air inlet of the compressor 101 can be switched on or off. When the second end of the accumulator 201 is connected to the air inlet of the compressor 101, the refrigerant flowing out from the second end of the accumulator 201 can flow back to the compressor 101, completing the cycle after cold storage or heat release.

[0129] In some embodiments, the valve assembly includes a second throttling element 209, a first end of which is connected to a second end of an accumulator 201, and a second end of which is connected to an indoor heat exchanger 301 and an outdoor heat exchanger 105, respectively.

[0130] By setting the second throttling element 209, the connection between the second end of the accumulator 201 and the indoor heat exchanger 301 or the outdoor heat exchanger 105 can be switched on or off. When the second end of the accumulator 201 is connected to the indoor heat exchanger 301, the refrigerant in the accumulator 201 can flow to the indoor heat exchanger 301 for heat absorption and evaporation; while when the second end of the accumulator 201 is connected to the outdoor heat exchanger 105, the refrigerant in the accumulator 201 can flow to the outdoor heat exchanger 105, thus realizing the heat storage function.

[0131] In some embodiments, the valve assembly includes a third throttling element 106 disposed on the connecting pipe between the outdoor heat exchanger 105 and the indoor heat exchanger 301.

[0132] By setting the third throttling element 106, the throttling effect can be achieved in the heating mode, or the connecting pipeline between the accumulator 201 and the outdoor heat exchanger 105 can be cut off in the condensation and heat release mode or the independent heat release mode.

[0133] In some embodiments, the valve assembly includes a four-way valve 104, which includes a first port, a second port, a third port and a fourth port. The first port is connected to the exhaust port of the compressor 101, the second port is connected to the outdoor heat exchanger 105, the third port is connected to the air inlet of the compressor 101, and the fourth port is connected to the indoor heat exchanger 301.

[0134] By setting up a four-way valve 104, switching between connecting pipes can be achieved, providing support for different operating modes of the air conditioning system.

[0135] In some embodiments, the air conditioning system further includes a subcooler 109 disposed between the outdoor heat exchanger 105 and the indoor heat exchanger 301, and the subcooler 109 is connected to the air inlet of the compressor 101. By providing the subcooler 109, the cooling capacity of the air conditioning system can be increased.

[0136] In some embodiments, the air conditioning system further includes a fourth throttling element 107, the third throttling element 106 is disposed on the connecting pipe between the outdoor heat exchanger 105 and the subcooler 109, and the fourth throttling element 107 is disposed on the connecting pipe between the third throttling element 106 and the port of the subcooler 109 that connects to the air inlet of the compressor 101.

[0137] In some embodiments, the air conditioning system further includes a fifth control valve 108, which is connected between the subcooler 109 and the second connection point, the second connection point being connected to the third interface of the four-way valve 104 and the air inlet of the compressor 101, respectively.

[0138] In some embodiments, the air conditioning system further includes a gas-liquid separator 110 connected to the air inlet of the compressor 101. Optionally, all components connected to the air inlet of the compressor 101 are first connected to the inlet of the gas-liquid separator 110, and then separated by the gas-liquid separator 110 before being connected to the air inlet of the compressor 101.

[0139] By installing the gas-liquid separator 110, the amount of liquid entering the compressor 101 can be reduced, thus preventing liquid slugging.

[0140] In some embodiments, the air conditioning system further includes an oil separator 102 connected to the exhaust port of the compressor 101, wherein the exhaust of the compressor 101 is first separated by the oil separator 102 before being connected to other components connected to the exhaust port of the compressor 101.

[0141] By setting up an oil separator 102, the lubricating oil in the exhaust of the compressor 101 can be separated in a timely manner, preventing the refrigerant in the subsequent circulation from still containing impurities such as lubricating oil, and also enabling the recycling of lubricating oil.

[0142] In some embodiments, the air conditioning system further includes a one-way valve 103 connected to the exhaust port of the compressor 101. The inlet of the one-way valve 103 is connected to the exhaust port of the compressor 101, and the outlet of the one-way valve 103 is connected to the first end of the accumulator 201 and the first interface of the four-way valve 104, respectively.

[0143] By setting a one-way valve 103, refrigerant backflow can be prevented.

[0144] In some embodiments, the inlet of the one-way valve 103 is connected to the outlet of the oil separator 102.

[0145] In some embodiments, the connecting pipe between the exhaust port of the compressor 101 and the first end of the accumulator 201 is a first air pipe 202, the connecting pipe between the second end of the accumulator 201 and the air inlet of the compressor 101 is a second air pipe 203, the first end of the accumulator 201 is connected to a first liquid pipe 204, and the second end of the accumulator 201 is connected to a second liquid pipe 205.

[0146] In some embodiments, the valve assembly includes a first control valve 207, a second control valve 211, a third control valve 208, a fourth control valve 210, a first throttling element 206, a second throttling element 209, a third throttling element 206, and a four-way valve 104. The first control valve 207 and the first throttling element 206 are connected in parallel between a first end of the accumulator 201 and a first connection point. The first connection point communicates with the outdoor heat exchanger 105. The second control valve 211 is disposed on the connecting pipe between the first connection point and the indoor heat exchanger 301. The third control valve 208 is disposed on the connecting pipe between the first end of the accumulator 201 and the exhaust port of the compressor 101. The fourth control valve 207, the second control valve 211, the third control valve 208, the fourth control valve 210, the fourth control valve 210, the fourth control valve 210, the fifth control valve 209, the sixth control valve 200, the seventh control valve 200, the tug-of-war ... A third throttling element 106 is provided on the connecting pipe between the second end of the accumulator 201 and the air inlet of the compressor 101. The first end of the second throttling element 209 is connected to the second end of the accumulator 201. The second end of the second throttling element 209 is connected to the indoor heat exchanger 301 and the outdoor heat exchanger 105 respectively. The third throttling element 106 is provided on the connecting pipe between the outdoor heat exchanger 105 and the first connection point. The four-way valve 104 includes a first interface, a second interface, a third interface and a fourth interface. The first interface is connected to the exhaust port of the compressor 101, the second interface is connected to the outdoor heat exchanger 105, the third interface is connected to the air inlet of the compressor 101, and the fourth interface is connected to the indoor heat exchanger 301.

[0147] In some embodiments of the air conditioning system provided by the present invention, the first control valve 207, the second control valve 211, the third control valve 208, the fourth control valve 210 and the fifth control valve 108 may be on / off valves or proportional valves, etc.

[0148] In some embodiments of the air conditioning system provided by the present invention, the first throttling element 206, the second throttling element 209, the third throttling element 106 and the fourth throttling element 107 may be electronic expansion valves, etc.

[0149] The air conditioning system provided by this invention can achieve at least 12 operating modes by adjusting the state of the valve assembly, including conventional cooling, complete cold storage, cooling and cold storage, subcooling and cold release, condensation and cold release, parallel cold release, conventional heating, complete heat storage, heating and heat storage, mixed heat release, independent heat release, and defrosting. This meets different user needs, expands the application range of the air conditioning system, and greatly improves its availability. Furthermore, the air conditioning system designed in this invention features simplified piping and lower costs.

[0150] Based on the above-described air conditioning system, the present invention also provides a control method for the air conditioning system, comprising:

[0151] Determine the operating mode of the air conditioning system;

[0152] The valve components and accumulator 201 in the air conditioning system are controlled according to the preset control strategy and based on the working mode.

[0153] Currently, in order to conserve electricity resources, many cities have adopted time-of-use pricing policies. For example, during peak electricity consumption periods, the price is higher to raise people's awareness of saving electricity; during off-peak periods, the price is lower to guide people to use electricity resources during off-peak hours and avoid putting too much pressure on the power supply system.

[0154] Therefore, in some embodiments of the control method provided by the present invention, determining the operating mode of the air conditioning system includes:

[0155] During periods when the power supply system has high electricity prices, the operating mode of the air conditioning system is determined to be either the non-operating state of the corresponding energy storage unit 201, the state of releasing cooling capacity, or the state of releasing heat capacity.

[0156] During periods when the power supply system operates at low electricity prices, the operating mode of the air conditioning system is determined to be either the non-operating state of the corresponding energy storage unit 201, the state of storing cold energy, or the state of storing heat energy.

[0157] By determining the operating mode of the air conditioning system based on the electricity price of the power supply system, the energy storage unit 201 can store cooling or heating energy during periods of low electricity price. During periods of high electricity price, the air conditioning system can be set to a mode where the corresponding energy storage unit 201 is in a non-working state, a cooling energy release state, or a heating energy release state. This allows the energy storage unit 201 to store the heat or cooling energy in advance to achieve the purpose of cooling or heating, reduce the operating frequency of the compressor 101, reduce the power consumption of the air conditioning system during periods of high electricity price, and reduce the economic burden on users. It also helps to achieve peak-shifting of electricity use and reduce the power supply pressure on the power supply system.

[0158] In some embodiments, the air conditioning system can determine its operating mode based on the user's current needs, or it can automatically determine its operating mode based on pre-stored power supply system pricing standards.

[0159] In some embodiments, determining the operating mode of the air conditioning system includes:

[0160] Check whether there is energy stored in the energy storage device 201;

[0161] The operating mode of the air conditioning system is determined based on the test results.

[0162] In some embodiments, determining the operating mode of the air conditioning system based on the detection results includes:

[0163] When no energy is detected in the energy storage unit 201, the operating mode of the air conditioning system is determined to be the mode in which the corresponding energy storage unit 201 is in a non-working state, a heat storage state, or a cold storage state.

[0164] When energy is detected in the energy storage unit 201, the operating mode of the air conditioning system can be determined according to the needs, which corresponds to the energy storage unit 201 being in a non-working state, a heat storage state, a cold storage state, a heat release state, or a cold release state.

[0165] When using the energy in the energy storage unit 201, the energy balance in the energy storage unit 201 is detected in real time. When the energy balance is detected to be close to zero, the use of the energy in the energy storage unit 201 is stopped.

[0166] Based on the above-described air conditioning system, the present invention also provides a control method for the air conditioning system, comprising:

[0167] Determine the operating mode of the air conditioning system;

[0168] According to the preset control strategy and based on the working mode, the operation of the first control valve 207, the second control valve 211, the third control valve 208, the fourth control valve 210, the first throttling element 206, the second throttling element 209, the third throttling element 106 and the four-way valve 104 in the air conditioning system, as well as the status of the outdoor heat exchanger 105, the indoor heat exchanger 301 and the accumulator 201 are controlled.

[0169] In some embodiments, controlling the operation of the first control valve 207, the second control valve 211, the third control valve 208, the fourth control valve 210, the first throttling element 206, the second throttling element 209, the third throttling element 106, and the four-way valve 104 in the air conditioning system, as well as the state of the outdoor heat exchanger 105, the indoor heat exchanger 301, and the accumulator 201, according to a preset control strategy and based on the operating mode, includes:

[0170] When the working mode is the normal cooling mode, the four-way valve 104 is de-energized, the first interface is connected to the second interface, and the third interface is connected to the fourth interface.

[0171] The second control valve 211 is opened, while the first control valve 207, the third control valve 208, and the fourth control valve 210 are all closed; and

[0172] The first throttling element 206 and the second throttling element 209 are both in the closed state, and the third throttling element 106 is in the open state with an adjustable opening size.

[0173] In this system, the indoor heat exchanger 301 is used as an evaporator, the outdoor heat exchanger 105 is used as a condenser, and the accumulator 201 is turned off.

[0174] In some embodiments, controlling the operation of the first control valve 207, the second control valve 211, the third control valve 208, the fourth control valve 210, the first throttling element 206, the second throttling element 209, the third throttling element 106, and the four-way valve 104 in the air conditioning system, as well as the state of the outdoor heat exchanger 105, the indoor heat exchanger 301, and the accumulator 201, according to a preset control strategy and based on the operating mode, includes:

[0175] When the working mode is full cold storage mode, the four-way valve 104 is de-energized, the first interface is connected to the second interface, and the third interface is connected to the fourth interface.

[0176] The fourth control valve 210 is opened, while the first control valve 207, the third control valve 208, and the second control valve 211 are all closed; and

[0177] The first throttling element 206 and the third throttling element 106 are controlled to be in the open state and the opening size is adjustable, while the second throttling element 209 is in the closed state.

[0178] In this system, the indoor heat exchanger 301 is turned off, the outdoor heat exchanger 105 is used as a condenser, and the accumulator 201 is used as an evaporator.

[0179] In some embodiments, controlling the operation of the first control valve 207, the second control valve 211, the third control valve 208, the fourth control valve 210, the first throttling element 206, the second throttling element 209, the third throttling element 106, and the four-way valve 104 in the air conditioning system, as well as the state of the outdoor heat exchanger 105, the indoor heat exchanger 301, and the accumulator 201, according to a preset control strategy and based on the operating mode, includes:

[0180] When the working mode is refrigeration and cold storage mode, the four-way valve 104 is de-energized, the first interface is connected to the second interface, and the third interface is connected to the fourth interface.

[0181] Controls the fourth control valve 210 and the second control valve 211 to open, and the first control valve 207 and the third control valve 208 to close; and

[0182] The first throttling element 206 and the third throttling element 106 are controlled to be in the open state and the opening size is adjustable, while the second throttling element 209 is in the closed state.

[0183] Among them, the indoor heat exchanger 301 is used as an evaporator, the outdoor heat exchanger 105 is used as a condenser, and the accumulator 201 is used as an evaporator.

[0184] In some embodiments, controlling the operation of the first control valve 207, the second control valve 211, the third control valve 208, the fourth control valve 210, the first throttling element 206, the second throttling element 209, the third throttling element 106, and the four-way valve 104 in the air conditioning system, as well as the state of the outdoor heat exchanger 105, the indoor heat exchanger 301, and the accumulator 201, according to a preset control strategy and based on the operating mode, includes:

[0185] When the working mode is subcooling and releasing, the four-way valve 104 is de-energized, and the first port is connected to the second port, and the third port is connected to the fourth port.

[0186] Control the first control valve 207 to open, and the third control valve 208, the fourth control valve 210, and the second control valve 211 to close; and

[0187] The first throttling element 206 is controlled to be closed, while the second throttling element 209 and the third throttling element 106 are controlled to be open and the opening size is adjustable.

[0188] Among them, the indoor heat exchanger 301 is used as an evaporator, the outdoor heat exchanger 105 is used as a condenser, and the accumulator 201 is used as a subcooler.

[0189] In some embodiments, controlling the operation of the first control valve 207, the second control valve 211, the third control valve 208, the fourth control valve 210, the first throttling element 206, the second throttling element 209, the third throttling element 106, and the four-way valve 104 in the air conditioning system, as well as the state of the outdoor heat exchanger 105, the indoor heat exchanger 301, and the accumulator 201, according to a preset control strategy and based on the operating mode, includes:

[0190] When the working mode is condensation and cooling mode, the four-way valve 104 is de-energized, the first interface is connected to the second interface, and the third interface is connected to the fourth interface.

[0191] Control the third control valve 208 to open, and the first control valve 207, the fourth control valve 210, and the second control valve 211 to close; and

[0192] The first throttling element 206 and the third throttling element 106 are controlled to be in the closed state, and the second throttling element 209 is in the open state with an adjustable opening size;

[0193] In this system, the indoor heat exchanger 301 is used as an evaporator, the outdoor heat exchanger 105 is closed, and the accumulator 201 is used as a condenser.

[0194] In some embodiments, controlling the operation of the first control valve 207, the second control valve 211, the third control valve 208, the fourth control valve 210, the first throttling element 206, the second throttling element 209, the third throttling element 106, and the four-way valve 104 in the air conditioning system, as well as the state of the outdoor heat exchanger 105, the indoor heat exchanger 301, and the accumulator 201, according to a preset control strategy and based on the operating mode, includes:

[0195] When the working mode is parallel cooling mode, the four-way valve 104 is de-energized, the first interface is connected to the second interface, and the third interface is connected to the fourth interface.

[0196] Controls the opening of the third control valve 208 and the second control valve 211, and the closing of the first control valve 207 and the fourth control valve 210; and

[0197] The first throttling element 206 is controlled to be closed, while the second throttling element 209 and the third throttling element 106 are both open and their opening sizes are adjustable.

[0198] In this system, the indoor heat exchanger 301 is used as an evaporator, while the outdoor heat exchanger 105 and the accumulator 201 are both used as condensers.

[0199] In some embodiments, controlling the operation of the first control valve 207, the second control valve 211, the third control valve 208, the fourth control valve 210, the first throttling element 206, the second throttling element 209, the third throttling element 106, and the four-way valve 104 in the air conditioning system, as well as the state of the outdoor heat exchanger 105, the indoor heat exchanger 301, and the accumulator 201, according to a preset control strategy and based on the operating mode, includes:

[0200] When the working mode is the normal heating mode, the four-way valve 104 is energized, and the first port is connected to the fourth port, and the second port is connected to the third port.

[0201] Control the second control valve 211 to open, and the first control valve 207, the third control valve 208, and the fourth control valve 210 to close; and

[0202] The first throttling element 206 and the second throttling element 209 are controlled to be closed, and the third throttling element 106 is controlled to be open with an adjustable opening size;

[0203] In this system, the indoor heat exchanger 301 is used as a condenser, the outdoor heat exchanger 105 is used as an evaporator, and the accumulator 201 is turned off.

[0204] In some embodiments, controlling the operation of the first control valve 207, the second control valve 211, the third control valve 208, the fourth control valve 210, the first throttling element 206, the second throttling element 209, the third throttling element 106, and the four-way valve 104 in the air conditioning system, as well as the state of the outdoor heat exchanger 105, the indoor heat exchanger 301, and the accumulator 201, according to a preset control strategy and based on the operating mode, includes:

[0205] When the working mode is full heat storage mode, the four-way valve 104 is energized, the first port is connected to the fourth port, and the second port is connected to the third port.

[0206] Controls the opening of the third control valve 208 and the second control valve 211, and the closing of the first control valve 207 and the fourth control valve 210; and

[0207] The first throttling element 206 is controlled to be closed, while the second throttling element 209 and the third throttling element 106 are controlled to be open and the opening size is adjustable.

[0208] In this system, the indoor heat exchanger 301 is turned off, the outdoor heat exchanger 105 is used as an evaporator, and the accumulator 201 is used as a condenser.

[0209] In some embodiments, controlling the operation of the first control valve 207, the second control valve 211, the third control valve 208, the fourth control valve 210, the first throttling element 206, the second throttling element 209, the third throttling element 106, and the four-way valve 104 in the air conditioning system, as well as the state of the outdoor heat exchanger 105, the indoor heat exchanger 301, and the accumulator 201, according to a preset control strategy and based on the operating mode, includes:

[0210] When the working mode is heating and heat storage mode, the four-way valve 104 is energized, the first port is connected to the fourth port, and the second port is connected to the third port.

[0211] Controls the opening of the third control valve 208 and the second control valve 211, and the closing of the first control valve 207 and the fourth control valve 210; and

[0212] The first throttling element 206 is controlled to be closed, while the second throttling element 209 and the third throttling element 106 are controlled to be open and the opening size is adjustable.

[0213] Among them, the indoor heat exchanger 301 is used as a condenser, the outdoor heat exchanger 105 is used as an evaporator, and the accumulator 201 is used as a condenser.

[0214] In some embodiments, controlling the operation of the first control valve 207, the second control valve 211, the third control valve 208, the fourth control valve 210, the first throttling element 206, the second throttling element 209, the third throttling element 106, and the four-way valve 104 in the air conditioning system, as well as the state of the outdoor heat exchanger 105, the indoor heat exchanger 301, and the accumulator 201, according to a preset control strategy and based on the operating mode, includes:

[0215] When the working mode is the mixed heat release mode, the four-way valve 104 is energized, the first port is connected to the fourth port, and the second port is connected to the third port.

[0216] Controls the fourth control valve 210 and the second control valve 211 to open, and the first control valve 207 and the third control valve 208 to close; and

[0217] The first throttling element 206 and the third throttling element 106 are both in the open state and the opening size is adjustable, while the second throttling element 209 is in the closed state.

[0218] Among them, the indoor heat exchanger 301 is used as a condenser, the outdoor heat exchanger 105 is used as an evaporator, and the accumulator 201 is used as an evaporator.

[0219] In some embodiments, controlling the operation of the first control valve 207, the second control valve 211, the third control valve 208, the fourth control valve 210, the first throttling element 206, the second throttling element 209, the third throttling element 106, and the four-way valve 104 in the air conditioning system, as well as the state of the outdoor heat exchanger 105, the indoor heat exchanger 301, and the accumulator 201, according to a preset control strategy and based on the operating mode, includes:

[0220] When the working mode is independent heat release mode, the four-way valve 104 is energized, the first port is connected to the fourth port, and the second port is connected to the third port.

[0221] Controls the fourth control valve 210 and the second control valve 211 to open, and the first control valve 207 and the third control valve 208 to close; and

[0222] The first throttling element 206 is controlled to be in the open state and the opening size is adjustable, while the second throttling element 209 and the third throttling element 106 are both in the closed state.

[0223] In this system, the indoor heat exchanger 301 is used as a condenser, the outdoor heat exchanger 105 is closed, and the accumulator 201 is used as an evaporator.

[0224] In some embodiments, controlling the operation of the first control valve 207, the second control valve 211, the third control valve 208, the fourth control valve 210, the first throttling element 206, the second throttling element 209, the third throttling element 106, and the four-way valve 104 in the air conditioning system, as well as the state of the outdoor heat exchanger 105, the indoor heat exchanger 301, and the accumulator 201, according to a preset control strategy and based on the operating mode, includes:

[0225] When the working mode is defrosting mode, the four-way valve 104 is de-energized, the first interface is connected to the second interface, and the third interface is connected to the fourth interface.

[0226] The fourth control valve 210 is opened, while the first control valve 207, the third control valve 208, and the second control valve 211 are all closed; and

[0227] The first throttling element 206 and the third throttling element 106 are controlled to be in the open state and the opening size is adjustable, while the second throttling element 209 is in the closed state.

[0228] In this system, the indoor heat exchanger 301 is turned off, the outdoor heat exchanger 105 is used as a condenser, and the accumulator 201 is used as an evaporator.

[0229] The present invention also provides a control device for an air conditioning system, comprising:

[0230] The memory is configured to store instructions;

[0231] The processor is coupled to the memory, and the processor is configured to implement the control method described above based on the execution of instructions stored in the memory.

[0232] The present invention also provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, which, when executed by a processor, implement the above-described control method.

[0233] The following is in conjunction with the appendix Figures 1 to 12 The working process of the air conditioning system provided by this invention is described below:

[0234] like Figure 1 As shown, the air conditioning system includes an outdoor unit 1, an energy storage device 2, and an indoor unit.

[0235] The compressor 101 outlet of outdoor unit 1 is sequentially connected to oil separator 102, check valve 103, and four-way valve 104. Four-way valve 104 can be connected to outdoor heat exchanger 105. Outdoor heat exchanger 105 is connected to third throttling device 106. One path of third throttling device 106 passes through cooler 109 and is connected to energy storage device 2. The other path passes through fourth throttling device 107, subcooler 109, and fifth control valve 108 and is connected to gas-liquid separator 110. The outlet of gas-liquid separator 110 is connected to the air inlet of compressor 101.

[0236] The first end of the accumulator 201 in the energy storage device 2 is connected to the exhaust pipe of the compressor 101 via the first gas pipe 202, and to the liquid-side main pipe 3 via the first liquid pipe 204. The second end of the accumulator 201 is connected to the inlet pipe of the gas-liquid separator 110 via the second gas pipe 203, and to the liquid-side main pipe 3 via the second liquid pipe 205. To achieve function switching, a third control valve 208 is arranged on the first gas pipe 202 of the accumulator 201, and a first throttling device 206 and a first control valve 207 are arranged on the first liquid pipe 204, which are connected in parallel. A fourth control valve 210 is arranged on the second gas pipe 203, and a second throttling device 209 is arranged on the second liquid pipe 205. A second control valve 211 is arranged between the interface connected to the first liquid pipe 204 and the interface connected to the second liquid pipe 205 in the liquid-side main pipe 3. The liquid-side main pipe 3 and the gas-side main pipe 4 are respectively connected to the two sides of the indoor heat exchanger 301 of the indoor unit.

[0237] This embodiment provides a multifunctional energy storage air conditioning system that can provide energy storage and release services for various different power load transfer scenarios.

[0238] The accumulator 201 is filled with energy storage materials, such as organic phase change materials like ice water and paraffin wax, and inorganic phase change materials like mirabilite. The accumulator 201 is equipped with a refrigerant pipe, in which the refrigerant flows and exchanges heat fully with the energy storage material, enabling both cold storage and heat release.

[0239] By switching valve components, various functions can be achieved, including conventional refrigeration, complete cold storage, refrigeration and cold storage, subcooling and cold release, condensation and cold release, conventional heating, complete heat storage, heating and heat storage, mixed heat release, independent heat release, and defrosting.

[0240] Table 1 shows the correspondence between various operating modes and the states of various components in the valve assembly and the heat exchanger.

[0241] Table 1 Correspondence between Operating Modes and Valve States

[0242]

[0243]

[0244] like Figure 2 As shown, in normal cooling mode:

[0245] When the four-way valve 104 is de-energized, the first port connects to the second port, and the third port connects to the fourth port; the second control valve 211 opens, and the first control valve 207, the third control valve 208, and the fourth control valve 210 are all closed; the first throttling element 206 and the second throttling element 209 are both closed, and the third throttling element 106 is open with an adjustable opening size; wherein, the indoor heat exchanger 301 is used as an evaporator, the outdoor heat exchanger 105 is used as a condenser, and the accumulator 201 is closed.

[0246] The refrigerant discharged by the compressor 101 flows through the outdoor heat exchanger 105 and enters the indoor unit through the liquid-side main pipe 3. After evaporation in the indoor unit, it returns to the suction side of the compressor 101 through the gas-side main pipe 4 and the gas-liquid separator 110. At this time, the accumulator 201 is not used, and only the conventional refrigeration cycle function is realized.

[0247] like Figure 3 As shown, in full cold storage mode:

[0248] When the four-way valve 104 is de-energized, the first port connects to the second port, and the third port connects to the fourth port; the fourth control valve 210 opens, and the first control valve 207, the third control valve 208, and the second control valve 211 are all closed; the first throttling element 206 and the third throttling element 106 are in the open state and their opening sizes are adjustable, while the second throttling element 209 is in the closed state; among these, the indoor heat exchanger 301 is closed, the outdoor heat exchanger 105 is used as a condenser, and the accumulator 201 is used as an evaporator.

[0249] The refrigerant discharged from the compressor 101 flows through the outdoor heat exchanger 105, through the liquid-side main pipe 3 and the first throttling device 206, into the accumulator 201. After evaporation, it returns to the suction side of the compressor 101 through the second gas pipe 203 and the gas-liquid separator 110. The refrigerant does not flow through the indoor unit, but evaporates in the accumulator 201, storing the cooling capacity in the accumulator 201.

[0250] like Figure 4 As shown, in the cooling and cold storage mode:

[0251] When the four-way valve 104 is de-energized, the first port connects to the second port, and the third port connects to the fourth port; the fourth control valve 210 and the second control valve 211 open, and the first control valve 207 and the third control valve 208 close; the first throttling element 206 and the third throttling element 106 are in the open state and the opening size is adjustable, while the second throttling element 209 is in the closed state; wherein, the indoor heat exchanger 301 is used as an evaporator, the outdoor heat exchanger 105 is used as a condenser, and the accumulator 201 is used as an evaporator.

[0252] The refrigerant discharged from compressor 101 flows through outdoor heat exchanger 105 and is divided into two paths via liquid-side main pipe 3. One path enters accumulator 201 through first throttling element 206, evaporates, and flows into second gas pipe 203. The other path enters indoor heat exchanger for evaporation. The two paths converge at the inlet of gas-liquid separator 110 and return to the suction side of compressor 101. At this time, accumulator 201 and indoor heat exchanger simultaneously act as evaporators. Accumulator 201 stores cold energy, and indoor heat exchanger provides cooling to the room.

[0253] like Figure 5 As shown, in the subcooled release mode:

[0254] When the four-way valve 104 is de-energized, the first port connects to the second port, and the third port connects to the fourth port; the first control valve 207 opens, and the third control valve 208, the fourth control valve 210, and the second control valve 211 close; the first throttling element 206 is closed, and the second throttling element 209 and the third throttling element 106 are open and their opening sizes are adjustable; wherein, the indoor heat exchanger 301 is used as an evaporator, the outdoor heat exchanger 105 is used as a condenser, and the accumulator 201 is used as a subcooler.

[0255] The refrigerant discharged from compressor 101 flows through outdoor heat exchanger 105, through liquid-side main pipe 3 and first control valve 207 into accumulator 201. After subcooling, it flows through second liquid pipe 205 and second throttling device 209 back into liquid-side main pipe 3. After evaporation in indoor heat exchanger, it returns to the suction side of compressor 101 through gas-side main pipe 4 and gas-liquid separator 110. At this time, accumulator 201 acts as a subcooler, releasing cooling capacity to the refrigerant condensed in outdoor heat exchanger 105, further increasing its subcooling degree before flowing into indoor unit for evaporation, thereby improving the refrigerant's cooling capacity.

[0256] like Figure 6 As shown, in condensation and heat release mode:

[0257] When the four-way valve 104 is de-energized, the first port connects to the second port, and the third port connects to the fourth port; the third control valve 208 opens, and the first control valve 207, the fourth control valve 210, and the second control valve 211 close; the first throttling element 206 and the third throttling element 106 are closed, and the second throttling element 209 is open with an adjustable opening size; wherein, the indoor heat exchanger 301 is used as an evaporator, the outdoor heat exchanger 105 is closed, and the accumulator 201 is used as a condenser.

[0258] The refrigerant discharged from compressor 101 flows into accumulator 201 through first gas pipe 202 and third control valve 208 for condensation. Then, it enters liquid-side main pipe 3 via second liquid pipe 205 and second throttling device 209. After evaporation in indoor heat exchanger, it returns to the suction side of compressor 101 via gas-side main pipe 4 and gas-liquid separator 110. At this time, outdoor heat exchanger 105 is not used; instead, accumulator 201 is used as a condenser to provide cooling capacity for the refrigeration cycle. Because the temperature of the cold storage material in accumulator 201 is much lower than the outdoor ambient temperature, the refrigeration cycle can operate under low pressure ratio conditions, significantly reducing the load on compressor 101.

[0259] like Figure 7 As shown, in the parallel cooling mode:

[0260] When the four-way valve 104 is de-energized, the first port connects to the second port, and the third port connects to the fourth port; the third control valve 208 and the second control valve 211 open, and the first throttling element 206, the first control valve 207, and the fourth control valve 210 close; the second throttling element 209 and the third throttling element 106 are both open and their opening sizes are adjustable; among them, the indoor heat exchanger 301 is used as an evaporator, and the outdoor heat exchanger 105 and the accumulator 201 are both used as condensers.

[0261] The refrigerant discharged from compressor 101 is divided into two paths. The first path flows through the first gas pipe 202 and the third control valve 208 into accumulator 201 for condensation, and then through the second liquid pipe 205 and the second throttling device 209 into the liquid-side main pipe 3. The other path flows through outdoor heat exchanger 105 for condensation, and then through the liquid-side main pipe 3 and the second control valve 211 before merging with the first path. After evaporation in indoor heat exchanger 301, it returns to the suction side of compressor 101 through the gas-side main pipe 4 and the gas-liquid separator 110. At this time, accumulator 201 and outdoor heat exchanger 105 are used simultaneously for condensation. Because accumulator 201 and outdoor heat exchanger 105 are used simultaneously as condensation devices, a large condensation capacity can be provided to meet the needs of high-load operation of the unit.

[0262] like Figure 8 As shown, in the normal heating mode:

[0263] When the four-way valve 104 is energized, the first port is connected to the fourth port, and the second port is connected to the third port; the second control valve 211 is open, and the first control valve 207, the third control valve 208, and the fourth control valve 210 are closed; the first throttling element 206 and the second throttling element 209 are closed, and the third throttling element 106 is open and its opening size is adjustable; wherein, the indoor heat exchanger 301 is used as a condenser, the outdoor heat exchanger 105 is used as an evaporator, and the accumulator 201 is closed.

[0264] The refrigerant discharged from compressor 101 flows into the indoor heat exchanger for condensation via the gas-side main pipe 4, and flows into the outdoor heat exchanger 105 for evaporation via the liquid-side main pipe 3. It then returns to the suction side of compressor 101 via gas-liquid separator 110. At this time, the accumulator is not used, and only the conventional heating cycle is used.

[0265] like Figure 9 As shown, in full heat storage mode:

[0266] When the four-way valve 104 is energized, the first port is connected to the fourth port, and the second port is connected to the third port; the third control valve 208 and the second control valve 211 are opened, and the first control valve 207 and the fourth control valve 210 are closed; the first throttling element 206 is in the closed state, and the second throttling element 209 and the third throttling element 106 are in the open state with adjustable opening size; wherein, the indoor heat exchanger 301 is closed, the outdoor heat exchanger 105 is used as an evaporator, and the accumulator 201 is used as a condenser.

[0267] The refrigerant discharged from the compressor flows into the accumulator 201 through the first gas pipe 202 and the third control valve 208 for condensation. Then, it enters the liquid-side main pipe 3 through the second liquid pipe 205 and the second throttling device 209, and flows into the outdoor heat exchanger 105 through the second control valve 211. After evaporation in the outdoor heat exchanger 105, it returns to the suction side of the compressor 101 through the four-way valve 104, the gas-side main pipe 4, and the gas-liquid separator 110. At this time, the refrigerant condenses in the accumulator 201, storing heat, and evaporates in the outdoor heat exchanger 105.

[0268] like Figure 10 As shown, in the heat storage heating mode:

[0269] When the four-way valve 104 is energized, the first port is connected to the fourth port, and the second port is connected to the third port; the third control valve 208 and the second control valve 211 are opened, and the first control valve 207 and the fourth control valve 210 are closed; the first throttling element 206 is in the closed state, and the second throttling element 209 and the third throttling element 106 are in the open state with adjustable opening size; wherein, the indoor heat exchanger 301 is used as a condenser, the outdoor heat exchanger 105 is used as an evaporator, and the accumulator 201 is used as a condenser.

[0270] The refrigerant discharged from the compressor is divided into two paths. One path flows into the accumulator 201 through the first gas pipe 202 and the third control valve 208 for condensation, and then enters the liquid-side main pipe 3 through the second liquid pipe 205 and the second throttling device 209. The other path enters the indoor heat exchanger through the four-way valve 104, condenses, and then enters the liquid-side main pipe 3 to merge with the first path of refrigerant. After condensation, it flows into the outdoor heat exchanger 105 through the second control valve 211 for evaporation, and then returns to the suction side of the compressor 101 through the four-way valve 104, the gas-side main pipe 4, and the gas-liquid separator 110. At this time, the accumulator 201 and the indoor heat exchanger simultaneously act as condensers, storing heat and generating heat at the same time, while the outdoor heat exchanger 105 acts as an evaporator.

[0271] like Figure 11 As shown, in the mixed heat release mode:

[0272] When the four-way valve 104 is energized, the first port is connected to the fourth port, and the second port is connected to the third port; the fourth control valve 210 and the second control valve 211 are opened, and the first control valve 207 and the third control valve 208 are closed; the first throttling element 206 and the third throttling element 106 are both in the open state and the opening size is adjustable, while the second throttling element 209 is in the closed state; wherein, the indoor heat exchanger 301 is used as a condenser, the outdoor heat exchanger 105 is used as an evaporator, and the accumulator 201 is used as an evaporator.

[0273] The refrigerant discharged from compressor 101 flows into indoor heat exchanger 301 via gas-side main pipe 4 for condensation. After passing through second control valve 211, it is split into two streams: one stream flows through first liquid pipe 204 and first throttling device 206 into accumulator 201 for evaporation, then flows into second gas pipe 203 and fourth control valve 210; the other stream flows through liquid-side main pipe 3 into outdoor heat exchanger 105 for evaporation. The two streams of refrigerant converge at the inlet section of gas-liquid separator 110 and return to the suction side of compressor 101. At this time, accumulator 201 undertakes part of the evaporation load, increasing the suction pressure.

[0274] like Figure 12 As shown, in independent heat release mode:

[0275] When the four-way valve 104 is energized, the first port is connected to the fourth port, and the second port is connected to the third port; the fourth control valve 210 and the second control valve 211 are opened, and the first control valve 207 and the third control valve 208 are closed; the first throttling element 206 is in the open state and the opening size is adjustable, while the second throttling element 209 and the third throttling element 106 are both in the closed state; wherein, the indoor heat exchanger 301 is used as a condenser, the outdoor heat exchanger 105 is closed, and the accumulator 201 is used as an evaporator.

[0276] The refrigerant discharged from compressor 101 flows into the indoor heat exchanger via the gas-side main pipe 4 for condensation. After passing through the second control valve 211, it enters the accumulator 201 via the first liquid pipe 204 and the first throttling device 206 for evaporation. Then, it flows into the gas-liquid separator 110 via the second gas pipe 203 and returns to the suction side of compressor 101. At this time, the accumulator 201 bears the entire evaporation load.

[0277] like Figure 13 As shown, in defrost mode:

[0278] When the four-way valve 104 is de-energized, the first port connects to the second port, and the third port connects to the fourth port; the fourth control valve 210 opens, and the first control valve 207, the third control valve 208, and the second control valve 211 are all closed; the first throttling element 206 and the third throttling element 106 are in the open state and their opening sizes are adjustable, while the second throttling element 209 is in the closed state; among these, the indoor heat exchanger 301 is closed, the outdoor heat exchanger 105 is used as a condenser, and the accumulator 201 is used as an evaporator.

[0279] The refrigerant discharged from compressor 101 flows through outdoor heat exchanger 105 and condenses. It then enters accumulator 201 through liquid-side main pipe 3 and first throttling device 206. After evaporation, it returns to the suction side of compressor 101 through fourth control valve 210, second gas pipe 203, and gas-liquid separator 110. The refrigerant does not flow through indoor unit but evaporates in accumulator 201, using the stored heat to defrost outdoor heat exchanger 105.

[0280] When electricity prices are low, energy storage device 2 is used to store energy; when electricity prices are high, energy storage device 2 is used to release cold or heat, which can provide energy for the system, reduce the operating frequency of the compressor, reduce power consumption, reduce operating costs, achieve "peak shaving and valley filling" of electricity, and reduce the operating cost of air conditioning.

[0281] When defrosting using energy storage device 2, it can handle the system's evaporation load. Compared to the reverse circulation defrosting scheme used in air conditioners without energy storage, it does not need to absorb heat from the room, thus helping to maintain indoor comfort. Overall, this multi-functional energy storage air conditioning system can effectively reduce operating costs for various application scenarios.

[0282] Users can generally determine the low energy consumption requirement and ultra-low energy consumption requirement based on real-time electricity prices and power consumption: when the electricity price is at its peak, or when the air conditioning cooling demand is large, users can set the low energy consumption requirement and ultra-low energy consumption requirement according to the actual situation.

[0283] When the air conditioning system only has cooling demand, the piping is switched to "normal cooling" mode, and the accumulator 201 is not used. When the system only has cold storage demand, it is switched to "full cold storage" mode, and the indoor unit is not used. When the system has both cold storage and cooling demand, it is switched to "cooling and cold storage simultaneously" mode, and the refrigerant flow allocated to the accumulator 201 is adjusted by the opening of the first throttling element 206. When the system has a cooling demand with low energy consumption and high condensation capacity, and the accumulator 201 contains cold energy, it is switched to "parallel cold release" mode. In this mode, since the accumulator and the outdoor heat exchanger are used as condensers simultaneously, it is possible to reduce energy consumption while increasing cooling capacity. The purpose of condensation release: When the system has a low energy consumption and low condensation release cooling demand, and the accumulator 201 has stored cold energy, it switches to the "subcooling release" mode. In this mode, the stored cold energy is used to subcool the refrigerant, providing additional cooling capacity, thus achieving the goal of reducing energy consumption. When the system has an ultra-low energy consumption release cooling demand, and the accumulator 201 has stored cold energy, it switches to the "condensation release" mode. The accumulator 201 acts as the condenser and the indoor unit acts as the evaporator to achieve the cooling cycle. In this mode, the low-temperature material in the accumulator is used as the cold source, and the cooling capacity of the refrigerant is greatly improved, thus helping to significantly reduce the system's energy consumption.

[0284] When the air conditioning system only has heating demand, switch the piping to "normal heating" mode; when the system only has heat storage demand, switch to "full heat storage" mode; when the system has both heating and heat storage demand, switch to "heating and heat storage simultaneously" mode; when the system has low-energy heat release heating demand, and the accumulator 201 contains heat, switch to "mixed heat release" mode. In this mode, the accumulator 201 and the outdoor heat exchanger 105 simultaneously act as evaporators, which helps increase the suction pressure of the compressor 101, increase the displacement of the compressor 101 and the cooling capacity of the system. The operating frequency of 1 is reduced, thereby reducing energy consumption. When the system has an ultra-low energy consumption heat release heating demand and the accumulator 201 contains heat, it switches to the "independent heat release" mode. At this time, the accumulator 201 acts as an independent heat source with a higher heat exchange temperature, which can significantly improve the heating capacity of the refrigerant, thereby reducing system energy consumption. When the system is detected to have a defrosting demand and the accumulator 201 contains heat, the four-way valve reverses and switches to the "defrosting" mode, releasing the heat stored in the accumulator 201 to provide heat for the defrosting of the outdoor heat exchanger 105.

[0285] In cooling mode, when there is a need to significantly reduce power consumption in a short period, the condensation-release cooling function can be used. This means that instead of using the outdoor heat exchanger as a condenser, the accumulator alone acts as the condenser for the cooling cycle. Because the temperature of the energy storage material in the accumulator after storing cold energy is low, much lower than the outdoor ambient temperature, the compressor does not need to provide excessive pressure. The system can operate under low compression ratio conditions, greatly reducing system energy consumption. Simultaneously, the heat conduction between the low-temperature energy storage material and the refrigerant replaces the air-cooled heat exchange of the outdoor heat exchanger, improving heat exchange efficiency. In heating mode, the accumulator can also be used alone as an evaporator to form a cooling cycle with the indoor heat exchanger, reducing energy consumption and improving efficiency.

[0286] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of the present invention or equivalent substitutions can still be made to some technical features without departing from the principle of the present invention, and such modifications and equivalent substitutions should all be covered within the scope of the technical solutions claimed in the present invention.

Claims

1. An air conditioning system, characterized in that, include: Compressor (101); Outdoor heat exchanger (105); Indoor heat exchanger (301); An energy accumulator (201) has its first end connected to the exhaust ports of the outdoor heat exchanger (105) and the compressor (101), respectively, and its second end connected to the air inlets of the indoor heat exchanger (301) and the compressor (101), respectively; and A valve assembly is connected to the compressor (101), the outdoor heat exchanger (105), the indoor heat exchanger (301), and the accumulator (201). The valve assembly is configured to control the flow direction of the refrigerant and / or the opening and closing of the connecting pipes to adjust the state of the accumulator (201) and realize the switching of the air conditioning system between different working modes. The state of the accumulator (201) includes non-working state, cold storage state, cold release state, heat storage state, and heat release state. The valve assembly includes a first control valve (207), a second control valve (211), a third control valve (208), a fourth control valve (210), a first throttling element (206), a second throttling element (209), and a third throttling element (106). The first control valve (207) and the first throttling element (206) are connected in parallel between the first end of the accumulator (201) and the first connection point. The first connection point is connected to the outdoor heat exchanger (105). The second control valve (211) is located on the connecting pipe between the first connection point and the indoor heat exchanger (301). The third control valve (208)... The first end of the accumulator (201) and the exhaust port of the compressor (101) are connected in a connecting pipe. The fourth control valve (210) is connected in a connecting pipe between the second end of the accumulator (201) and the air inlet of the compressor (101). The first end of the second throttling element (209) is connected to the second end of the accumulator (201). The second end of the second throttling element (209) is connected to the indoor heat exchanger (301) and the outdoor heat exchanger (105) respectively. The third throttling element (106) is connected in a connecting pipe between the outdoor heat exchanger (105) and the first connection point. The end of the third control valve (208) near the accumulator (201) is connected to the pipeline between the first end of the accumulator (201) and the first control valve (207); The end of the fourth control valve (210) near the accumulator (201) is connected to the pipeline between the second end of the accumulator (201) and the second throttling element (209).

2. The air conditioning system according to claim 1, characterized in that, The first connection point is located on the pipeline connecting the outdoor heat exchanger (105) to the first control valve (207) and the first throttling device (206).

3. The air conditioning system according to claim 1, characterized in that, It also includes a subcooler (109) disposed between the outdoor heat exchanger (105) and the indoor heat exchanger (301), and the subcooler (109) is connected to the air inlet of the compressor (101).

4. The air conditioning system according to any one of claims 1 to 3, characterized in that, The valve assembly includes a four-way valve (104), which includes a first port, a second port, a third port and a fourth port. The first port is connected to the exhaust port of the compressor (101), the second port is connected to the outdoor heat exchanger (105), the third port is connected to the air inlet of the compressor (101), and the fourth port is connected to the indoor heat exchanger (301).

5. A control method for an air conditioning system as described in any one of claims 1 to 4, characterized in that, include: Determine the operating mode of the air conditioning system; The valve assembly and the accumulator (201) in the air conditioning system are controlled according to the preset control strategy and the working mode.

6. The control method according to claim 5, characterized in that, Determining the operating mode of the air conditioning system includes: During periods when the power supply system has high electricity prices, the operating mode of the air conditioning system is determined to be the mode corresponding to the energy storage device (201) being in a non-working state, releasing cold energy, or releasing heat. During periods when the power supply system has low electricity prices, the operating mode of the air conditioning system is determined to be the mode corresponding to the energy storage device (201) being in a non-working state, a cold storage state, or a heat storage state.

7. The control method according to claim 5, characterized in that, Determining the operating mode of the air conditioning system includes: Detect whether there is energy stored in the energy storage device (201); The operating mode of the air conditioning system is determined based on the test results.

8. A control method based on the air conditioning system as described in claim 4, characterized in that, include: Determine the operating mode of the air conditioning system; According to the preset control strategy and based on the working mode, the operation of the first control valve (207), the second control valve (211), the third control valve (208), the fourth control valve (210), the first throttling element (206), the second throttling element (209), the third throttling element (106), and the four-way valve (104) in the air conditioning system, as well as the status of the outdoor heat exchanger (105), the indoor heat exchanger (301), and the accumulator (201) are controlled.

9. The control method according to claim 8, characterized in that, According to the preset control strategy and based on the working mode, the operation of the first control valve (207), the second control valve (211), the third control valve (208), the fourth control valve (210), the first throttling element (206), the second throttling element (209), the third throttling element (106), and the four-way valve (104) in the air conditioning system, as well as the state of the outdoor heat exchanger (105), the indoor heat exchanger (301), and the accumulator (201), are controlled as follows: When the working mode is the normal cooling mode, the four-way valve (104) is de-energized, the first interface is connected to the second interface, and the third interface is connected to the fourth interface; The second control valve (211) is opened, while the first control valve (207), the third control valve (208), and the fourth control valve (210) are all closed; and The first throttling device (206) and the second throttling device (209) are both in the closed state, and the third throttling device (106) is in the open state with an adjustable opening size; The indoor heat exchanger (301) is used as an evaporator, the outdoor heat exchanger (105) is used as a condenser, and the accumulator (201) is turned off.

10. The control method according to claim 8, characterized in that, According to the preset control strategy and based on the working mode, the operation of the first control valve (207), the second control valve (211), the third control valve (208), the fourth control valve (210), the first throttling element (206), the second throttling element (209), the third throttling element (106), and the four-way valve (104) in the air conditioning system, as well as the state of the outdoor heat exchanger (105), the indoor heat exchanger (301), and the accumulator (201), are controlled as follows: When the working mode is the full cold storage mode, the four-way valve (104) is de-energized, the first interface is connected to the second interface, and the third interface is connected to the fourth interface; The fourth control valve (210) is opened, while the first control valve (207), the third control valve (208), and the second control valve (211) are all closed; and The first throttling device (206) and the third throttling device (106) are controlled to be in the open state and the opening size is adjustable, while the second throttling device (209) is in the closed state; The indoor heat exchanger (301) is closed, the outdoor heat exchanger (105) is used as a condenser, and the accumulator (201) is used as an evaporator.

11. The control method according to claim 8, characterized in that, According to the preset control strategy and based on the working mode, the operation of the first control valve (207), the second control valve (211), the third control valve (208), the fourth control valve (210), the first throttling element (206), the second throttling element (209), the third throttling element (106), and the four-way valve (104) in the air conditioning system, as well as the state of the outdoor heat exchanger (105), the indoor heat exchanger (301), and the accumulator (201), are controlled as follows: When the working mode is the refrigeration and cold storage mode, the four-way valve (104) is de-energized, the first interface is connected to the second interface, and the third interface is connected to the fourth interface; The fourth control valve (210) and the second control valve (211) are opened, while the first control valve (207) and the third control valve (208) are closed; and The first throttling device (206) and the third throttling device (106) are controlled to be in the open state and the opening size is adjustable, while the second throttling device (209) is in the closed state; The indoor heat exchanger (301) is used as an evaporator, the outdoor heat exchanger (105) is used as a condenser, and the accumulator (201) is used as an evaporator.

12. The control method according to claim 8, characterized in that, According to the preset control strategy and based on the working mode, the operation of the first control valve (207), the second control valve (211), the third control valve (208), the fourth control valve (210), the first throttling element (206), the second throttling element (209), the third throttling element (106), and the four-way valve (104) in the air conditioning system, as well as the state of the outdoor heat exchanger (105), the indoor heat exchanger (301), and the accumulator (201), are controlled as follows: When the working mode is the subcooling release mode, the four-way valve (104) is de-energized, the first interface is connected to the second interface, and the third interface is connected to the fourth interface; The first control valve (207) is opened, and the third control valve (208), the fourth control valve (210), and the second control valve (211) are closed; and The first throttling device (206) is controlled to be in the closed state, while the second throttling device (209) and the third throttling device (106) are in the open state and the opening size is adjustable; The indoor heat exchanger (301) is used as an evaporator, the outdoor heat exchanger (105) is used as a condenser, and the accumulator (201) is used as a subcooler.

13. The control method according to claim 8, characterized in that, According to the preset control strategy and based on the working mode, the operation of the first control valve (207), the second control valve (211), the third control valve (208), the fourth control valve (210), the first throttling element (206), the second throttling element (209), the third throttling element (106), and the four-way valve (104) in the air conditioning system, as well as the state of the outdoor heat exchanger (105), the indoor heat exchanger (301), and the accumulator (201), are controlled as follows: When the working mode is condensation and cooling mode, the four-way valve (104) is de-energized, the first interface is connected to the second interface, and the third interface is connected to the fourth interface; The third control valve (208) is opened, and the first control valve (207), the fourth control valve (210), and the second control valve (211) are closed; and The first throttling device (206) and the third throttling device (106) are controlled to be in the closed state, and the second throttling device (209) is in the open state with an adjustable opening size; The indoor heat exchanger (301) is used as an evaporator, the outdoor heat exchanger (105) is turned off, and the accumulator (201) is used as a condenser.

14. The control method according to claim 8, characterized in that, According to the preset control strategy and based on the working mode, the operation of the first control valve (207), the second control valve (211), the third control valve (208), the fourth control valve (210), the first throttling element (206), the second throttling element (209), the third throttling element (106), and the four-way valve (104) in the air conditioning system, as well as the state of the outdoor heat exchanger (105), the indoor heat exchanger (301), and the accumulator (201), are controlled as follows: When the working mode is parallel cooling mode, the four-way valve (104) is de-energized, the first interface is connected to the second interface, and the third interface is connected to the fourth interface; The third control valve (208) and the second control valve (211) are opened, while the first control valve (207) and the fourth control valve (210) are closed; and The first throttling device (206) is controlled to be in the closed state, while the second throttling device (209) and the third throttling device (106) are both in the open state and the opening size is adjustable; The indoor heat exchanger (301) is used as an evaporator, and the outdoor heat exchanger (105) and the accumulator (201) are both used as condensers.

15. The control method according to claim 8, characterized in that, According to the preset control strategy and based on the working mode, the operation of the first control valve (207), the second control valve (211), the third control valve (208), the fourth control valve (210), the first throttling element (206), the second throttling element (209), the third throttling element (106), and the four-way valve (104) in the air conditioning system, as well as the state of the outdoor heat exchanger (105), the indoor heat exchanger (301), and the accumulator (201), are controlled as follows: When the working mode is the normal heating mode, the four-way valve (104) is energized, the first interface is connected to the fourth interface, and the second interface is connected to the third interface; The second control valve (211) is opened, and the first control valve (207), the third control valve (208), and the fourth control valve (210) are closed; and The first throttling device (206) and the second throttling device (209) are controlled to be in the closed state, and the third throttling device (106) is in the open state with an adjustable opening size; The indoor heat exchanger (301) is used as a condenser, the outdoor heat exchanger (105) is used as an evaporator, and the accumulator (201) is turned off.

16. The control method according to claim 8, characterized in that, According to the preset control strategy and based on the working mode, the operation of the first control valve (207), the second control valve (211), the third control valve (208), the fourth control valve (210), the first throttling element (206), the second throttling element (209), the third throttling element (106), and the four-way valve (104) in the air conditioning system, as well as the state of the outdoor heat exchanger (105), the indoor heat exchanger (301), and the accumulator (201), are controlled as follows: When the working mode is the full heat storage mode, the four-way valve (104) is energized, the first interface is connected to the fourth interface, and the second interface is connected to the third interface; The third control valve (208) and the second control valve (211) are opened, while the first control valve (207) and the fourth control valve (210) are closed; and The first throttling device (206) is controlled to be in the closed state, while the second throttling device (209) and the third throttling device (106) are in the open state and the opening size is adjustable; The indoor heat exchanger (301) is closed, the outdoor heat exchanger (105) is used as an evaporator, and the accumulator (201) is used as a condenser.

17. The control method according to claim 8, characterized in that, According to the preset control strategy and based on the working mode, the operation of the first control valve (207), the second control valve (211), the third control valve (208), the fourth control valve (210), the first throttling element (206), the second throttling element (209), the third throttling element (106), and the four-way valve (104) in the air conditioning system, as well as the state of the outdoor heat exchanger (105), the indoor heat exchanger (301), and the accumulator (201), are controlled as follows: When the working mode is heating and heat storage mode, the four-way valve (104) is energized, the first interface is connected to the fourth interface, and the second interface is connected to the third interface; The third control valve (208) and the second control valve (211) are opened, and the first control valve (207) and the fourth control valve (210) are closed; and The first throttling device (206) is controlled to be in the closed state, while the second throttling device (209) and the third throttling device (106) are in the open state and the opening size is adjustable; The indoor heat exchanger (301) is used as a condenser, the outdoor heat exchanger (105) is used as an evaporator, and the accumulator (201) is used as a condenser.

18. The control method according to claim 8, characterized in that, According to the preset control strategy and based on the working mode, the operation of the first control valve (207), the second control valve (211), the third control valve (208), the fourth control valve (210), the first throttling element (206), the second throttling element (209), the third throttling element (106), and the four-way valve (104) in the air conditioning system, as well as the state of the outdoor heat exchanger (105), the indoor heat exchanger (301), and the accumulator (201), are controlled as follows: When the working mode is the mixed heat release mode, the four-way valve (104) is energized, the first interface is connected to the fourth interface, and the second interface is connected to the third interface; The fourth control valve (210) and the second control valve (211) are opened, while the first control valve (207) and the third control valve (208) are closed; and The first throttling device (206) and the third throttling device (106) are both in the open state and the opening size is adjustable, while the second throttling device (209) is in the closed state; The indoor heat exchanger (301) is used as a condenser, the outdoor heat exchanger (105) is used as an evaporator, and the accumulator (201) is used as an evaporator.

19. The control method according to claim 8, characterized in that, According to the preset control strategy and based on the working mode, the operation of the first control valve (207), the second control valve (211), the third control valve (208), the fourth control valve (210), the first throttling element (206), the second throttling element (209), the third throttling element (106), and the four-way valve (104) in the air conditioning system, as well as the state of the outdoor heat exchanger (105), the indoor heat exchanger (301), and the accumulator (201), are controlled as follows: When the working mode is independent heat release mode, the four-way valve (104) is energized, the first interface is connected to the fourth interface, and the second interface is connected to the third interface; The fourth control valve (210) and the second control valve (211) are opened, while the first control valve (207) and the third control valve (208) are closed; and The first throttling device (206) is controlled to be in the open state and the opening size is adjustable, while the second throttling device (209) and the third throttling device (106) are both in the closed state; The indoor heat exchanger (301) is used as a condenser, the outdoor heat exchanger (105) is turned off, and the accumulator (201) is used as an evaporator.

20. The control method according to claim 8, characterized in that, According to the preset control strategy and based on the working mode, the operation of the first control valve (207), the second control valve (211), the third control valve (208), the fourth control valve (210), the first throttling element (206), the second throttling element (209), the third throttling element (106), and the four-way valve (104) in the air conditioning system, as well as the state of the outdoor heat exchanger (105), the indoor heat exchanger (301), and the accumulator (201), are controlled as follows: When the working mode is defrosting mode, the four-way valve (104) is de-energized, the first interface is connected to the second interface, and the third interface is connected to the fourth interface; The fourth control valve (210) is opened, while the first control valve (207), the third control valve (208), and the second control valve (211) are all closed; and The first throttling device (206) and the third throttling device (106) are controlled to be in the open state and the opening size is adjustable, while the second throttling device (209) is in the closed state; The indoor heat exchanger (301) is closed, the outdoor heat exchanger (105) is used as a condenser, and the accumulator (201) is used as an evaporator.

21. A control device for an air conditioning system, comprising: The memory is configured to store instructions; A processor, coupled to a memory, configured to implement the control method as described in any one of claims 8 to 20 based on the execution of instructions stored in the memory.

22. A computer-readable storage medium, wherein, The computer-readable storage medium stores computer instructions that, when executed by a processor, implement the control method as described in any one of claims 8 to 20.

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