Air conditioner, heat pump system thereof, control method, and storage medium

Abstract

The application discloses a heat pump system, a control method of an air conditioner, the air conditioner and a storage medium. The compressor of the heat pump system has an exhaust port, a return air port and a gas supplement port. When the heat pump system is in a first mode, the exhaust port is communicated with a first heat exchanger, the return air port is communicated with a second heat exchanger, a pipeline between the first heat exchanger and the second heat exchanger comprises a first pipeline, a heat exchange branch is heat exchange connected with the first pipeline, a first end of a connecting branch is communicated with the first pipeline, a second end of the connecting branch, a pipeline between the second end of the connecting branch and the return air port, the heat exchange branch and the gas supplement port are all connected with a flow direction switching module, and the flow direction switching module is used for switching the refrigerant flow direction between a first state and a second state. In the first state, the refrigerant flowing out of the second end of the connecting branch flows through the heat exchange branch and enters the gas supplement port. In the second state, the refrigerant flowing out of the second heat exchanger flows through the heat exchange branch and enters the return air port. The application aims to improve the energy efficiency of the air conditioner and the operation stability of the compressor.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and more particularly to heat pump systems, control methods for air conditioners, air conditioners, and storage media. Background Technology

[0002] Air conditioners, especially multi-split air conditioners, often need to operate in low-load environments in addition to meeting the needs of high-load operation.

[0003] The operating parameters of components such as the compressor in an air conditioner are limited. Under low load conditions, even if each component operates at its minimum capacity limit, the minimum heat exchange output of the air conditioner cannot be too low. This can easily lead to excessive heat exchange output, causing frequent compressor shutdowns. Additionally, this can result in excessively low suction superheat of the compressor, causing liquid slugging and damaging the compressor. Conversely, under high load conditions, even if each component operates at its maximum capacity limit, the actual output capacity of the air conditioner is easily insufficient due to the harsh operating conditions, reducing the air conditioner's energy efficiency. Summary of the Invention

[0004] The main objective of this invention is to provide a heat pump system, an air conditioner control method, an air conditioner, and a storage medium, aiming to improve the energy efficiency of the air conditioner while enhancing the operational stability of the compressor.

[0005] To achieve the above objectives, the present invention provides a heat pump system, the heat pump system comprising:

[0006] A refrigerant circulation loop includes a compressor, a first heat exchanger, and a second heat exchanger. The compressor has an exhaust port, a return port, and a make-up port. When the heat pump system is in a first mode, the exhaust port is connected to the first heat exchanger, the return port is connected to the second heat exchanger, and the pipeline between the first heat exchanger and the second heat exchanger includes a first pipeline. The first heat exchanger is in a condensing state and the second heat exchanger is in an evaporating state in the first mode.

[0007] A heat exchange branch is connected to the first pipeline for heat exchange.

[0008] A connecting branch, the first end of which is connected to the first pipeline;

[0009] The flow direction switching module is used to switch the refrigerant flow direction between the first state and the second state when the heat pump system is in the first state. In the first state, the refrigerant flowing out of the second end of the connecting branch flows through the heat exchange branch and enters the gas inlet. In the second state, the refrigerant flowing out of the second end of the connecting branch flows through the heat exchange branch and enters the gas inlet.

[0010] Optionally, when the heat pump system is in the first mode, the pipeline between the second heat exchanger and the return gas port includes a second pipeline, and the flow direction switching module includes:

[0011] The first branch, the first end of the second pipeline is connected to the first end of the heat exchange branch through the first branch, and the second end of the connecting branch is connected to the first end of the heat exchange branch;

[0012] The second branch, the second end of the heat exchange branch is connected to the air inlet through the second branch;

[0013] The third branch is formed by connecting the second end of the second pipeline to the second end of the heat exchange branch via the third branch.

[0014] A refrigerant valve assembly, wherein the first branch, the second branch, and the third branch are all connected to the refrigerant valve assembly, and the refrigerant valve assembly has a first operating position and a second operating position. In the first operating position, the second end of the heat exchange branch is connected to the second branch, the third branch is blocked, and the first branch is blocked. In the second operating position, the second end of the heat exchange branch is connected to the third branch, the second branch is blocked, and the first branch is connected.

[0015] Optionally, the refrigerant valve assembly includes:

[0016] The first three-way valve is used to connect the second end of the heat exchange branch, the second branch, and the third branch.

[0017] The second three-way valve connects the first end of the first branch, the first end of the second pipeline, and the second heat exchanger.

[0018] Optionally, the number of the first heat exchanger and / or the second heat exchanger may be more than one.

[0019] Furthermore, to achieve the above objectives, this application also proposes a control method for an air conditioner, based on the heat pump system described in any of the preceding claims, the control method comprising:

[0020] When the heat pump system is in the first mode, the status parameters of the air conditioner are acquired, and the status parameters characterize the load of the air conditioner.

[0021] When the state parameter does not meet the preset condition, the flow direction switching module is controlled to operate so that the refrigerant flow direction in the refrigerant circulation loop reaches the first state.

[0022] When the state parameter meets the preset condition, the flow direction switching module is controlled to operate so that the refrigerant flow direction in the refrigerant circulation loop reaches the second state.

[0023] The preset condition indicates that the demand load of the air conditioner is less than the preset load.

[0024] Optionally, the pipeline between the second heat exchanger and the return gas port includes a second pipeline, and the flow direction switching module includes a first branch, a second branch, a third branch, and a refrigerant valve assembly;

[0025] The step of controlling the flow direction switching module to operate so that the refrigerant flow direction in the refrigerant circulation loop reaches the first state when the state parameter does not meet the preset conditions includes:

[0026] When the state parameters do not meet the preset conditions, the refrigerant valve assembly is controlled to operate in the first operating position, so that the refrigerant flowing out of the connecting branch flows sequentially through the heat exchange branch, the second branch and enters the air inlet, and the refrigerant flow in the first branch and the third branch is stopped.

[0027] The step of controlling the flow direction switching module to operate so that the refrigerant flow direction in the refrigerant circulation loop reaches the second state when the state parameter meets the preset condition includes:

[0028] When the state parameters meet the preset conditions, the refrigerant valve assembly is controlled to operate in the second operating position, so that the refrigerant flowing out of the second heat exchanger flows sequentially through the first branch, the heat exchange branch and the third branch before entering the return port, and the refrigerant flow in the second branch stops.

[0029] Optionally, the refrigerant valve assembly includes a first three-way valve and a second three-way valve, and the step of controlling the refrigerant valve assembly to operate in a first operating position includes:

[0030] The first three-way valve is controlled to operate in the first valve position and the second three-way valve is controlled to operate in the third valve position. In the first valve position, the heat exchange branch is connected to the second branch and the heat exchange branch is disconnected from the third branch. In the third valve position, the second heat exchanger is connected to the second pipeline and the second heat exchanger is disconnected from the first branch. The first operating position includes the first valve position and the third valve position.

[0031] The step of controlling the refrigerant valve assembly to operate in the second operating position includes:

[0032] The first three-way valve is controlled to operate in the second valve position and the second three-way valve is controlled to operate in the fourth valve position. In the second valve position, the heat exchange branch is disconnected from the second branch and the heat exchange branch is connected to the third branch. In the fourth valve position, the second heat exchanger is disconnected from the second pipeline and the second heat exchanger is connected to the first end of the first branch. The second operating position includes the second valve position and the fourth valve position.

[0033] Optionally, the status parameter includes the compressor frequency of the air conditioner, and the preset condition includes the compressor frequency being less than a preset frequency.

[0034] Optionally, the ambient temperature of the environment where the air conditioner is located is obtained, and the preset frequency is determined based on the ambient temperature.

[0035] Optionally, the connection branch includes a throttle valve, and after the step of obtaining the status parameters of the air conditioner, the method further includes:

[0036] When the state parameter does not meet the preset condition, control the throttle valve to open and execute the step of controlling the flow direction switching module to make the refrigerant flow direction in the refrigerant circulation loop reach the first state.

[0037] When the state parameter meets the preset condition, control the throttle valve to close and execute the step of controlling the flow direction switching module to make the refrigerant flow direction in the refrigerant circulation loop reach the second state.

[0038] Furthermore, in order to achieve the above objectives, this application also proposes an air conditioner, the air conditioner comprising:

[0039] The heat pump system as described in any of the preceding items;

[0040] A control device, wherein the heat pump system is connected to the control device, the control device comprising: a memory, a processor, and an air conditioner control program stored in the memory and executable on the processor, wherein the air conditioner control program, when executed by the processor, implements the steps of the air conditioner control method as described in any of the preceding claims.

[0041] In addition, to achieve the above objectives, this application also proposes a storage medium storing a control program for an air conditioner, which, when executed by a processor, implements the steps of the control method for the air conditioner as described in any of the preceding claims.

[0042] This invention proposes a heat pump system comprising a refrigerant circulation loop, heat exchange branches, connecting branches, and a flow direction switching module. In the refrigerant circulation loop, a first pipe connecting the first and second heat exchangers is heat-exchange connected to the heat exchange branches. Through the state switching of the flow direction switching module, when the heat pump system is in a first mode, the refrigerant in the first pipe can not only exchange heat with the refrigerant flowing out of the connecting branches, allowing the refrigerant flowing from the condenser to replenish the compressor and increase its enthalpy, thus improving energy efficiency; the refrigerant in the first pipe can also exchange heat with the refrigerant returning to the compressor from the second heat exchanger, increasing the compressor's suction superheat. This effectively prevents compressor liquid slugging, thus avoiding compressor damage. Furthermore, it reduces the mass flow rate in the compressor, lowering the air conditioner's output capacity and compressor power consumption under low-load conditions, preventing frequent compressor shutdowns due to excessively high output capacity at low loads. Therefore, when the heat pump system is in the first mode, the air conditioner can control the operation of the flow direction switching module according to different load demands, thereby improving both the air conditioner's energy efficiency and the compressor's operational stability. In addition, when the return gas from the compressor exchanges heat with the first pipeline, it can increase the subcooling of the refrigerant entering the second heat exchanger. When the second heat exchanger is located in an indoor environment, it can prevent the refrigerant from flashing in the pipeline, ensure the heat exchange effect, and reduce the throttling noise of the refrigerant on the indoor side. Attached Figure Description

[0043] Figure 1 This is a structural schematic diagram of an embodiment of the heat pump system of the present invention and a flow direction schematic diagram in the first state;

[0044] Figure 2 This is a structural schematic diagram of an embodiment of the heat pump system of the present invention and a flow direction schematic diagram in the second state.

[0045] Figure 3 This is a schematic diagram of the hardware structure involved in the operation of an embodiment of the air conditioner of the present invention;

[0046] Figure 4 This is a flowchart illustrating an embodiment of the control method for an air conditioner according to the present invention;

[0047] Figure 5 This is a flowchart illustrating another embodiment of the control method for an air conditioner according to the present invention;

[0048] Figure 6 This is a flowchart illustrating another embodiment of the control method for the air conditioner of the present invention.

[0049] Explanation of icon numbers:

[0050] 1 heat pump system 15 Flow direction switching module 11 compressor 151 First branch road 111 exhaust port 152 Second branch road 112 air return port 153 Third branch road 113 Intake port 154 Refrigerant valve assembly 12 First heat exchanger 1541 First three-way valve 13 Throttling components 1542 Second three-way valve 14 Second heat exchanger 16 Reversing valve 01 First pipeline 17 gas-liquid separator 02 Second pipeline 18 Connecting branch 03 heat exchange branch 2 Control device

[0051] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0052] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0053] This invention provides a heat pump system 1.

[0054] In this embodiment of the invention, reference is made to Figure 1 and Figure 2 The heat pump system 1 includes a refrigerant circulation loop, a heat exchange branch 03, a connecting branch 18, and a flow direction switching module 15.

[0055] The refrigerant circulation loop includes a compressor 11, a first heat exchanger 12, a throttling component 13, and a second heat exchanger 14. The compressor 11 has an exhaust port 111, a return port 112, and a make-up port 113.

[0056] When the heat pump system 1 is in the first mode, the exhaust port 111 is connected to the first heat exchanger 12, and the return port 112 is connected to the second heat exchanger 14. The first heat exchanger 12 is in a condensing state and the second heat exchanger 14 is in an evaporating state corresponding to the first mode.

[0057] The throttling component 13 is located between the first heat exchanger 12 and the second heat exchanger 14.

[0058] Among them, the exhaust port 111 is connected to the high-pressure zone of the compression chamber in the compressor 11, the return port 112 is connected to the low-pressure zone of the compression chamber in the compressor 11, and the make-up port 113 is connected to the medium-pressure zone of the compression chamber in the compressor 11. The air pressure in the low-pressure zone, medium-pressure zone and high-pressure zone increases sequentially.

[0059] The refrigerant discharged from the compressor 11 flows sequentially through the first heat exchanger 12, the throttling device 13, and the second heat exchanger 14 before returning to the compressor 11. The first heat exchanger 12 is in a condensing state, and the second heat exchanger 14 is in an evaporating state.

[0060] At least one of the first heat exchanger 12 and the second heat exchanger 14 is located in an indoor environment. The first heat exchanger 12 can be an indoor heat exchanger, and the second heat exchanger 14 can be an outdoor heat exchanger. Alternatively, the first heat exchanger 12 can be an outdoor heat exchanger, and the second heat exchanger 14 can be an indoor heat exchanger. Or, both the first heat exchanger 12 and the second heat exchanger 14 can be indoor heat exchangers. For example, if the first heat exchanger 12 is located indoors, the first mode can be an air conditioner's cooling mode, defrosting mode, or dehumidification mode, etc. As another example, if the first heat exchanger 12 is located outdoors, the first mode can also be an air conditioner's heating mode, disinfection mode, or cleaning mode, etc.

[0061] The piping between the first heat exchanger 12 and the second heat exchanger 14 includes a first pipe 01, and the heat exchange branch 03 is heat-exchange connected to the first pipe 01. Specifically, the first pipe 01 includes a first pipe section and a second pipe section. The first heat exchanger 12 and the throttling device 13 are connected through the first pipe section, and the second heat exchanger 14 and the throttling device 13 are connected through the second pipe section. The heat exchange branch 03 is heat-exchange connected to the first pipe section.

[0062] Specifically, the heat pump system 1 also includes a heat exchange module, and the heat exchange branch 03 is connected to the first pipeline 01 for heat exchange within the heat exchange module. In this embodiment, the heat exchange module is a plate heat exchanger.

[0063] The first end of the connecting branch 18 is connected to the first pipe 01. The connecting branch 18 is used to throttle and reduce the pressure of the refrigerant flowing into the first pipe 01 before it flows out. In this embodiment, the connecting branch 18 includes a throttling valve. When the throttling valve is open, a portion of the refrigerant in the first pipe 01 flows through the throttling valve to reduce its pressure; when the throttling valve is closed, the refrigerant in the first pipe 01 is prohibited from flowing into the throttling valve. In other embodiments, the connecting branch 18 may also be a throttling component 13 without a control function, such as a capillary tube.

[0064] The second end of the connecting branch 18, the pipeline between the second heat exchanger 14 and the return gas port 112, the heat exchange branch 03, and the gas supply port 113 are all connected to the flow direction switching module 15. The flow direction switching module 15 is used to switch the refrigerant flow direction between a first state and a second state. In the first state, the refrigerant flowing out of the second end of the connecting branch 18 flows through the heat exchange branch 03 and enters the gas supply port 113. In the second state, the refrigerant flowing out of the second heat exchanger 14 flows through the heat exchange branch 03 and enters the return gas port 112.

[0065] The flow direction switching module 15 can control the refrigerant flowing out of the second heat exchanger 14 to flow through the second pipeline 02 into the return gas port 112. All or part of the refrigerant flows into the heat exchange branch 03, and controls the refrigerant flowing out of the heat exchange branch 03 to flow into the return gas port 112 and / or the gas supply port 113. The flow direction switching module 15 can also control whether the refrigerant flowing out of the connecting branch 18 flows into or does not flow into the heat exchange branch 03.

[0066] The flow direction switching module 15 may include a combination of several pipelines and several control valves. Any functional component and its combination that can switch between the first state and the second state can be used as the flow direction switching module 15.

[0067] In this embodiment, in the first state, except that the refrigerant flowing out of the second end of the connecting branch 18 flows through the heat exchange branch 03 and enters the gas supply port 113, the refrigerant flowing out of the second heat exchanger 14 stops flowing into the heat exchange branch 03 and / or the refrigerant flowing out of the heat exchange branch 03 stops flowing into the return gas port 112 of the compressor 11; in the second state, except that the refrigerant flowing out of the second heat exchanger 14 flows through the heat exchange branch 03 and enters the return gas port 112, the refrigerant flowing out of the connecting branch 18 stops flowing into the heat exchange branch 03.

[0068] In this embodiment, the first heat exchanger 12 is a condenser, and the second heat exchanger 14 is an evaporator.

[0069] Reference Figure 1 In the first state, a portion of the medium-temperature refrigerant flowing out of the condenser flows through the first pipe 01 into the evaporator, and a portion of the refrigerant flowing out of the condenser is throttled and cooled by the connecting branch 18 before entering the heat exchange branch 03. The low-temperature refrigerant in the heat exchange branch 03 exchanges heat with the refrigerant in the first pipe 01. After heat exchange, the low-temperature refrigerant in the heat exchange branch 03 vaporizes and enters the gas supply port 113 of the compressor 11 to supply gas to the compressor 11 and increase its enthalpy, thereby improving the output capacity of the compressor 11 and improving the overall energy efficiency of the air conditioner. During this process, all the refrigerant flowing out of the evaporator flows through the second pipe 02 between the second heat exchanger 14 and the return gas port 112 and enters the return gas port 112 without entering the heat exchange branch 03.

[0070] Reference Figure 2 In the second state, all the refrigerant flowing out of the condenser flows through the first pipe 01 into the evaporator. The refrigerant flowing back to the return port 112 from the evaporator can partially or completely enter the heat exchange branch 03 to exchange heat with the first pipe 01. After heat exchange, the low-temperature refrigerant in the heat exchange branch 03 can increase the subcooling of the refrigerant entering the evaporator, and the medium-temperature refrigerant in the first pipe 01 can increase the superheat of the refrigerant entering the return port 112 of the compressor 11. This can effectively prevent the refrigerant flowing out of the evaporator from entering the return port 112 due to insufficient evaporation, causing liquid refrigerant to enter the compressor 11 and cause liquid slugging.

[0071] This embodiment proposes a heat pump system 1, which includes a refrigerant circulation loop, a heat exchange branch 03, a connecting branch 18, and a flow direction switching module 15. The first pipe 01 between the first heat exchanger 12 and the second heat exchanger 14 in the refrigerant circulation loop is heat-exchange connected to the heat exchange branch 03. Through the state switching of the flow direction switching module 15, when the heat pump system 1 is in the first mode, the refrigerant in the first pipe 01 can not only exchange heat with the refrigerant flowing out of the connecting branch 18, but also allow the refrigerant flowing out of the condenser to replenish the compressor 11 and increase its enthalpy to improve energy efficiency; the refrigerant in the first pipe 01 can also exchange heat with the refrigerant returning to the compressor 11 from the second heat exchanger 14 to improve the suction superheat of the compressor 11, which can effectively prevent liquid slugging in the compressor 11 and avoid damage to the compressor 11. It can also reduce the mass flow rate in the compressor 11, thereby reducing the output capacity of the air conditioner and the power consumption of the compressor 11 under low load conditions, and preventing the compressor 11 from frequently shutting down due to excessive output capacity under low load. Based on this, when the heat pump system 1 is in the first mode, the air conditioner can control the flow direction switching module 15 to operate according to different load requirements, thereby improving the energy efficiency of the air conditioner and the operational stability of the compressor 11. In addition, when the return gas of the compressor 11 exchanges heat with the first pipeline 01, it can also increase the subcooling of the refrigerant entering the second heat exchanger 14. When the second heat exchanger 14 is located in the indoor environment, it can prevent the refrigerant from flashing in the pipeline, ensure the heat exchange effect, and reduce the throttling noise of the refrigerant on the indoor side.

[0072] Furthermore, in one embodiment, referring to Figure 1 and Figure 2 The heat pump system 1 may further include a reversing valve 16. The exhaust port 111 of the compressor 11, the return port 112 of the compressor 11, the first heat exchanger 12, and the second heat exchanger 14 are all connected to the reversing valve 16. The reversing valve 16 can be used to switch the refrigerant flow direction in the refrigerant circulation loop to realize the switching of the heat pump system 1 between a first mode and a second mode. Specifically, when the reversing valve 16 is in the first position, the heat pump system 1 is in the first mode, the exhaust port 111 is connected to the first heat exchanger 12, and the return port 112 is connected to the second heat exchanger 14; when the reversing valve 16 is switched to the second position, the heat pump system 1 is in the second mode, the exhaust port 111 is connected to the second heat exchanger 14, and the return port 112 is connected to the first heat exchanger 12. In the second mode, the first heat exchanger 12 is in an evaporating state and the second heat exchanger is in a condensing state.

[0073] Furthermore, in one embodiment, referring to Figure 1 and Figure 2 The heat pump system 1 may also include a gas-liquid separator 17. When the heat pump system is in the first mode, the gas-liquid separator 17 is located between the second heat exchanger 14 and the return gas port 112 of the compressor 11 to perform gas-liquid separation on the refrigerant entering the return gas port 112.

[0074] Specifically, when the heat pump system 1 is equipped with the aforementioned reversing valve 16, the gas-liquid separator 17 is located in the connecting pipeline between the reversing valve 16 and the return gas port 112.

[0075] Furthermore, in one embodiment, referring to Figure 1 and Figure 2 When the heat pump system is in the first mode, the pipeline between the second heat exchanger 14 and the return gas port 112 includes the second pipeline 02, and the flow direction switching module 15 includes the first branch 151, the second branch 152, the third branch 153 and the refrigerant valve assembly 154.

[0076] When a gas-liquid separator 17 is installed between the second heat exchanger 14 and the return gas port 112, the second pipeline 02 is the pipeline between the gas-liquid separator 17 and the return gas port 112.

[0077] The first end of the second pipeline 02 is connected to the first end of the heat exchange branch 03 through the first branch 151; the second end of the connecting branch 18 is connected to the first end of the heat exchange branch 03; the second end of the heat exchange branch 03 is connected to the air supply port 113 through the second branch 152; and the second end of the second pipeline 02 is connected to the second end of the heat exchange branch 03 through the third branch 153.

[0078] Specifically, the first end of the first branch 151 is connected to the first end of the second pipe 02, and the second end of the first branch 151 and the second end of the connecting branch 18 are both connected to the first end of the heat exchange branch 03; the first end of the second branch 152 is connected to the second end of the heat exchange branch 03, and the second end of the second branch 152 is connected to the air supply port 113; the first end of the third branch 153 is connected to the second end of the heat exchange branch 03, and the third end of the third branch 153 is connected to the second end of the second pipe 02; the first branch 151, the second branch 152, and the third branch 153 are all connected to the refrigerant valve assembly 154.

[0079] The refrigerant valve assembly 154 has a first operating position and a second operating position. In the first operating position, the second end of the heat exchange branch 03 is connected to the second branch 152, the third branch 153 is blocked, and the first branch 151 is blocked. In the second operating position, the second end of the heat exchange branch 03 is connected to the third branch 153, the second branch 152 is blocked, and the first branch 151 is connected.

[0080] Blocking the third branch 153 may include blocking the second end of the heat exchange branch 03 from the first end of the third branch 153, and / or blocking the second end of the second pipe 02 from the second end of the third branch 153.

[0081] Here, "conducting the third branch 153" means that the second end of heat exchange branch 03, the first end of the third branch 153, the second end of the third branch 153, and the second end of the second pipeline 02 are connected in sequence.

[0082] Blocking the first branch 151 may include blocking the first end of the second pipe 02 from the first end of the first branch 151, and / or blocking the second end of the first branch 151 from the first end of the heat exchange branch 03.

[0083] Here, connecting the first branch 151 means that the first end of the second pipeline 02, the first end of the first branch 151, the second end of the first branch 151, and the first end of the heat exchange branch 03 are connected in sequence.

[0084] In this embodiment, the connection between the second end of the connecting branch 18 and the first end of the heat exchange branch 03 is controlled by the opening and closing of the connecting branch 18.

[0085] In other embodiments, the connection between the second end of connecting branch 18 and the first end of heat exchange branch 03 can also be controlled by refrigerant valve assembly 154. In the first operating position, in addition to connecting the second end of heat exchange branch 03 to the second branch 152, blocking the third branch 153, and blocking the first branch 151, the second end of connecting branch 18 and the first end of heat exchange branch 03 can also be connected. In the second operating position, in addition to connecting the second end of heat exchange branch 03 to the third branch 153, blocking the second branch 152, and connecting the first branch 151, the second end of connecting branch 18 and the first end of heat exchange branch 03 can also be blocked.

[0086] In this embodiment, the flow direction switching module 15, through the cooperation of the above-mentioned multiple branches and the refrigerant valve assembly 154, can realize the switching between the first state and the second state. In the first state, the return gas will not affect the enthalpy increase effect of the gas replenishment, and in the second state, the refrigerant flowing out of the condenser will not affect the effect of increasing the superheat of the return gas, thereby further improving the energy efficiency of the air conditioner and improving the operating stability of the compressor 11.

[0087] Furthermore, in one embodiment, referring to Figure 1 and Figure 2 The refrigerant valve assembly 154 includes a first three-way valve 1541 and a second three-way valve 1542. The second end of the heat exchange branch 03, the second branch 152, and the third branch 153 are all connected through the first three-way valve 1541; the first end of the first branch 151, the first end of the second pipeline 02, and the second heat exchanger 14 are all connected through the second three-way valve 1542.

[0088] The first three-way valve 1541 has a first valve position and a second valve position. In the first valve position, the second end of the heat exchange branch 03 is connected to the first end of the second branch 152 and the second end of the heat exchange branch 03 is blocked from the first end of the third branch 153. In the second valve position, the second end of the heat exchange branch 03 is blocked from the second branch 152 and the second end of the heat exchange branch 03 is connected to the third branch 153.

[0089] The second three-way valve 1542 has a third valve position and a fourth valve position. In the third valve position, the second heat exchanger 14 is connected to the first end of the second pipeline 02 and the second heat exchanger 14 is blocked from the first end of the first branch 151. In the fourth valve position, the second heat exchanger 14 is blocked from the first end of the second pipeline 02 and the second heat exchanger 14 is connected to the first end of the first branch 151.

[0090] The first operating position mentioned above includes the first valve position and the third valve position, and the second operating position includes the second valve position and the fourth valve position.

[0091] In this embodiment, the refrigerant switching between the first state and the second state is achieved through the cooperation of the first three-way valve 1541 and the second three-way valve 1542 with the above-mentioned multiple branches. This helps to minimize the valve body required for control, simplify the structure of the heat pump system 1, and improve the control efficiency of refrigerant switching while improving the energy efficiency of the air conditioner and the operating stability of the compressor 11.

[0092] In other embodiments, the refrigerant valve assembly 154 may also include a first control valve located in the first branch 151, a second control valve located in the second branch 152, a third control valve located in the third branch 153, and a fourth control valve located in the second pipeline 02. The first operating position includes the closed position of the first control valve, the open position of the second control valve, and the closed position of the third control valve; the second operating position includes the open position of the first control valve, the closed position of the second control valve, and the open position of the third control valve.

[0093] Furthermore, heat pump system 1 is a multi-split air conditioning heat pump system 1, referring to... Figure 1 and Figure 2 The number of the first heat exchanger 12 and / or the second heat exchanger 14 is more than one. When the first heat exchanger 12 and the second heat exchanger 14 include indoor heat exchangers and outdoor heat exchangers, in this embodiment, the number of indoor heat exchangers is more than one, and the number of outdoor heat exchangers is one. Different indoor heat exchangers are used to adjust the environmental parameters of different indoor spaces. Each indoor heat exchanger is equipped with a refrigerant valve to control the flow and blockage of refrigerant in the corresponding indoor heat exchanger. The refrigerant valve can be controlled according to the actual user needs of the corresponding indoor space. In other embodiments, the number of indoor heat exchangers and the number of outdoor heat exchangers can both be more than one.

[0094] Furthermore, this invention also proposes an air conditioner. (Refer to...) Figure 3 The air conditioner includes the aforementioned heat pump system 1 and control device 2. In this embodiment, the air conditioner is a multi-split air conditioner. In other embodiments, the air conditioner may also be a non-multi-split air conditioner.

[0095] In this embodiment of the invention, reference is made to Figure 3 The control device 2 of the air conditioner includes a processor 1001 (e.g., CPU), a memory 1002, a timer 1003, etc. The components in the control device 2 are connected via a communication bus. The memory 1002 can be a high-speed RAM or a stable, non-volatile memory, such as a disk drive. Optionally, the memory 1002 can also be a storage device independent of the aforementioned processor 1001.

[0096] Those skilled in the art will understand that Figure 3 The device structure shown does not constitute a limitation on the device and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0097] like Figure 3 As shown, the memory 1002, which serves as a storage medium, may include a control program for an air conditioner. Figure 3 In the device shown, the processor 1001 can be used to call the control program of the air conditioner stored in the memory 1002 and execute the relevant steps of the control method of the air conditioner in the following embodiments.

[0098] This invention also provides a control method for an air conditioner, applied to the aforementioned air conditioner.

[0099] Reference Figure 4 This application proposes an embodiment of a control method for an air conditioner. In this embodiment, the control method for the air conditioner includes:

[0100] Step S10: When the heat pump system is in the first mode, obtain the status parameters of the air conditioner, wherein the status parameters characterize the load of the air conditioner;

[0101] Specifically, status parameters may include the operating parameters of components in the air conditioner and / or the environmental parameters of the environment in which the air conditioner is located. For example, status parameters may include outdoor ambient temperature, compressor frequency, fan speed, indoor ambient temperature, indoor ambient temperature change rate and / or outdoor ambient temperature change rate, etc.

[0102] Step S20: When the state parameter does not meet the preset conditions, control the flow direction switching module 15 to run so that the refrigerant flow direction in the refrigerant circulation loop reaches the first state;

[0103] Step S30: When the state parameter meets the preset condition, control the flow direction switching module 15 to operate so that the refrigerant flow direction in the refrigerant circulation loop reaches the second state; wherein, the preset condition indicates that the demand load of the air conditioner is less than the preset load.

[0104] Demand load refers to the amount of heat exchanged that the air conditioner needs to output under current operating conditions. Preset load is specifically a threshold value used to distinguish whether the air conditioner has low-load demand. A demand load greater than or equal to the preset load indicates that the air conditioner does not have low-load demand, while a demand load less than the preset load indicates that the air conditioner has low-load demand.

[0105] The preset conditions are specifically pre-set target ranges, target quantity relationships, or target magnitude relationships with thresholds that the state parameters need to reach when the air conditioner has low load demand. If the state parameters do not meet the preset conditions, it indicates that the actual load demand of the air conditioner is high. At this time, the flow direction switching module 15 is used to control the operation to reach the first state. If the state parameters meet the preset conditions, it indicates that the actual load demand of the air conditioner is low. At this time, the flow direction switching module 15 is used to control the operation to reach the second state.

[0106] Reference Figure 1 In the first state, a portion of the medium-temperature refrigerant flowing out of the condenser flows through the first pipe 01 into the evaporator, and a portion of the refrigerant flowing out of the condenser is throttled and cooled by the connecting branch 18 before entering the heat exchange branch 03. The low-temperature refrigerant in the heat exchange branch 03 exchanges heat with the refrigerant in the first pipe 01. After heat exchange, the low-temperature refrigerant in the heat exchange branch 03 vaporizes and enters the gas supply port 113 of the compressor 11 to supply gas to the compressor 11 and increase its enthalpy, thereby improving the output capacity of the compressor 11 and improving the overall energy efficiency of the air conditioner. During this process, all the refrigerant flowing out of the evaporator flows through the second pipe 02 between the second heat exchanger 14 and the return gas port 112 and enters the return gas port 112 without entering the heat exchange branch 03.

[0107] Reference Figure 2 In the second state, all the refrigerant flowing out of the condenser flows through the first pipe 01 into the evaporator. The refrigerant flowing back to the return port 112 from the evaporator can partially or completely enter the heat exchange branch 03 to exchange heat with the first pipe 01. After heat exchange, the low-temperature refrigerant in the heat exchange branch 03 can increase the subcooling of the refrigerant entering the evaporator, and the medium-temperature refrigerant in the first pipe 01 can increase the superheat of the refrigerant entering the return port 112 of the compressor 11. This can effectively prevent the refrigerant flowing out of the evaporator from entering the return port 112 due to insufficient evaporation, causing liquid refrigerant to enter the compressor 11 and cause liquid slugging.

[0108] This invention proposes a control method for an air conditioner. When the air conditioner's load is high, the refrigerant in the first pipe 01 exchanges heat with the refrigerant flowing out of the connecting branch 18, allowing the refrigerant flowing out of the condenser to replenish the compressor 11 and increase its enthalpy, thereby improving energy efficiency. When the air conditioner's load is low, the refrigerant in the first pipe 01 can also exchange heat with the refrigerant returning to the compressor 11 through the second heat exchanger 14, thereby increasing the suction superheat of the compressor 11. This effectively prevents liquid slugging in the compressor 11, thus avoiding damage to the compressor 11. It also reduces the mass flow rate in the compressor 11, decreasing the air conditioner's output capacity and the compressor 11's power consumption under low-load operation, preventing the compressor 11 from frequently shutting down due to excessively high output capacity under low load. Based on this, the air conditioner can control the flow direction switching module 15 to operate according to different load requirements, thereby improving both the air conditioner's energy efficiency and the compressor 11's operational stability. The heat exchange between the refrigerant in the first pipe 01 and the heat exchange branch 03 can be used under all operating conditions, which is beneficial for improving its utilization efficiency. In addition, when the return gas of compressor 11 exchanges heat with the first pipeline 01, it can also increase the subcooling of the refrigerant entering the second heat exchanger 14. When the second heat exchanger 14 is located in an indoor environment, it can prevent the refrigerant from flashing in the pipeline, ensure the heat exchange effect, and reduce the throttling noise of the refrigerant on the indoor side.

[0109] Furthermore, in the above embodiments, the state parameter includes the frequency of the compressor 11 of the air conditioner, and the preset condition includes the compressor 11 frequency being less than a preset frequency.

[0110] When the frequency of compressor 11 is less than the preset frequency, the air conditioner requires a smaller output capacity and has a low-load requirement; when the frequency of compressor 11 is greater than or equal to the preset frequency, the air conditioner requires a larger output capacity and does not have a low-load requirement.

[0111] In this embodiment, the refrigerant switching direction in the refrigerant circulation loop is controlled based on the load demand represented by the frequency of the compressor 11. This helps to ensure that the heat exchange function of the heat exchange branch 03 and the first pipeline 01 can be accurately matched with the actual demand of the compressor 11, thereby further improving the operating reliability of the compressor 11, reducing power consumption, and reducing the output capacity of the compressor 11 under low load.

[0112] Furthermore, in this embodiment, the ambient temperature of the environment where the air conditioner is located is obtained, and the preset frequency is determined based on the ambient temperature. The ambient temperature may include indoor ambient temperature and / or outdoor ambient temperature. In this embodiment, the ambient temperature is the ambient temperature of the environment where the compressor 11 is located. In other embodiments, the ambient temperature may also be the indoor ambient temperature.

[0113] Specifically, when the ambient temperature is lower than the preset temperature, the first frequency is determined as the preset frequency; when the ambient temperature is greater than or equal to the preset temperature, the second frequency is determined as the preset frequency, and the first frequency is lower than the second frequency.

[0114] In this embodiment, the ambient temperature can accurately characterize the output capacity of the compressor 11 under the current environmental conditions and the environmental conditions' demand for heat exchange from the air conditioner. Therefore, determining the preset frequency in conjunction with the ambient temperature is beneficial to ensure that the refrigerant flow direction in the refrigerant circulation loop can be adapted to the actual load of the air conditioner for precise switching, thereby further improving the operating reliability of the compressor 11, reducing power consumption, and reducing the output capacity of the compressor 11 under low load.

[0115] Furthermore, based on the above embodiments, another embodiment of the control method for the air conditioner of this application is proposed. In this embodiment, the pipeline between the second heat exchanger 14 and the return air port 112 includes a second pipeline 02, and the flow direction switching module 15 includes a first branch 151, a second branch 152, a third branch 153, and a refrigerant valve assembly 154, as shown in the figure. Figure 5 Step S20 includes:

[0116] Step S21: When the state parameter does not meet the preset conditions, control the refrigerant valve assembly 154 to operate in the first operating position, so that the refrigerant flowing out of the connecting branch 18 flows sequentially through the heat exchange branch 03, the second branch 152 into the air supply port 113, and the first branch 151 and the third branch 153 both stop refrigerant flow.

[0117] In the first operating position, the second end of the heat exchange branch 03 is connected to the second branch 152, the third branch 153 is blocked, and the first branch 151 is blocked. Blocking the third branch 153 may include blocking the second end of the heat exchange branch 03 from the first end of the third branch 153, and / or blocking the second end of the second pipe 02 from the second end of the third branch 153. Blocking the first branch 151 may include blocking the first end of the second pipe 02 from the first end of the first branch 151, and / or blocking the second end of the first branch 151 from the first end of the heat exchange branch 03.

[0118] Step S30 includes:

[0119] Step S31: When the state parameter meets the preset condition, control the refrigerant valve assembly 154 to operate in the second operating position, so that the refrigerant flowing out of the second heat exchanger 14 flows sequentially through the first branch 151, the heat exchange branch 03 and the third branch 153 and then enters the return port 112 and the second branch 152 to stop the refrigerant flow.

[0120] In the second operating position, the second end of the heat exchange branch 03 is connected to the third branch 153, the second branch 152 is blocked, and the first branch 151 is connected. Here, connecting the third branch 153 means that the second end of the heat exchange branch 03, the first end of the third branch 153, the second end of the third branch 153, and the second end of the second pipe 02 are connected sequentially. Connecting the first branch 151 means that the first end of the second pipe 02, the first end of the first branch 151, the second end of the first branch 151, and the first end of the heat exchange branch 03 are connected sequentially.

[0121] In this embodiment, the flow direction switching module 15 switches the refrigerant flow direction between the first and second states by switching the refrigerant valve assembly 154 between the first and second operating positions through the above-mentioned multiple branches. In the first state, the return gas will not affect the enthalpy increase effect of the gas replenishment, and in the second state, the refrigerant flowing out of the condenser will not affect the effect of increasing the superheat of the return gas, thereby further improving the energy efficiency of the air conditioner and improving the operating stability of the compressor 11.

[0122] Furthermore, based on any of the above embodiments, another embodiment of the control method for the air conditioner of this application is proposed. In this embodiment, the refrigerant valve assembly 154 includes a first three-way valve 1541 and a second three-way valve 1542.

[0123] The step of controlling the refrigerant valve assembly 154 to operate in a first operating position includes: controlling the first three-way valve 1541 to operate in a first valve position and controlling the second three-way valve 1542 to operate in a third valve position. In the first valve position, the heat exchange branch 03 is connected to the second branch 152 and the heat exchange branch 03 is disconnected from the third branch 153. In the third valve position, the second heat exchanger 14 is connected to the second pipeline 02 and the second heat exchanger 14 is disconnected from the first branch 151.

[0124] The step of controlling the refrigerant valve assembly 154 to operate in the second operating position includes: controlling the first three-way valve 1541 to operate in the second valve position and controlling the second three-way valve 1542 to operate in the fourth valve position. In the second valve position, the heat exchange branch 03 is disconnected from the second branch 152 and the heat exchange branch 03 is connected to the third branch 153. In the fourth valve position, the second heat exchanger 14 is disconnected from the second pipeline 02 and the second heat exchanger 14 is connected to the first end of the first branch 151.

[0125] The first three-way valve 1541 has a first valve position and a second valve position. In the first valve position, the second end of the heat exchange branch 03 is connected to the first end of the second branch 152 and the second end of the heat exchange branch 03 is blocked from the first end of the third branch 153. In the second valve position, the second end of the heat exchange branch 03 is blocked from the second branch 152 and the second end of the heat exchange branch 03 is connected to the third branch 153.

[0126] The second three-way valve 1542 has a third valve position and a fourth valve position. In the third valve position, the second heat exchanger 14 is connected to the first end of the second pipeline 02 and the second heat exchanger 14 is blocked from the first end of the first branch 151. In the fourth valve position, the second heat exchanger 14 is blocked from the first end of the second pipeline 02 and the second heat exchanger 14 is connected to the first end of the first branch 151.

[0127] The first operating position mentioned above includes the first valve position and the third valve position, and the second operating position includes the second valve position and the fourth valve position.

[0128] In this embodiment, the refrigerant switching between the first state and the second state is achieved through the cooperation of the first three-way valve 1541 and the second three-way valve 1542 with the above-mentioned multiple branches. This helps to minimize the valve body required for control, simplify the structure of the heat pump system 1, and improve the control efficiency of refrigerant switching while improving the energy efficiency of the air conditioner and the operating stability of the compressor 11.

[0129] In other embodiments, the refrigerant valve assembly 154 may also include a first control valve located in the first branch 151, a second control valve located in the second branch 152, a third control valve located in the third branch 153, and a fourth control valve located in the second pipeline 02. The first operating position includes the closed position of the first control valve, the open position of the second control valve, and the closed position of the third control valve; the second operating position includes the open position of the first control valve, the closed position of the second control valve, and the open position of the third control valve.

[0130] Furthermore, based on any of the above embodiments, another embodiment of the control method for the air conditioner of this application is proposed. In this embodiment, the connecting branch 18 includes a throttle valve, as shown in the reference... Figure 6 After the step of obtaining the status parameters of the air conditioner, the method further includes:

[0131] Step S200: When the state parameter does not meet the preset conditions, control the throttle valve to open and execute the step of controlling the flow direction switching module 15 to make the refrigerant flow direction in the refrigerant circulation loop reach the first state.

[0132] Step S300: When the state parameter meets the preset condition, control the throttle valve to close and execute the step of controlling the flow direction switching module 15 to make the refrigerant flow direction in the refrigerant circulation loop reach the second state.

[0133] When the throttle valve is open, the refrigerant flowing into the first pipeline 01 flows into the heat exchange branch 03 after being throttled and depressurized by the throttle valve; when the throttle valve is closed, the refrigerant in the first pipeline 01 stops flowing into the first pipeline 01 and the heat exchange branch 03.

[0134] In this embodiment, by cooperating with the throttle valve and the flow direction switching module 15, the heat exchange branch 03 can introduce refrigerant from different locations into the first pipeline 01 for heat exchange according to different needs. This ensures that the heat exchange branch 03 does not need to replenish gas to increase enthalpy, and can also be used for return gas superheat, thereby effectively improving the utilization rate of the heat exchange branch 03, thereby improving the energy efficiency of the air conditioner and improving the operating stability of the compressor 11.

[0135] In other embodiments, the connection between the second end of the connecting branch 18 and the first end of the heat exchange branch 03 can also be controlled by the flow direction switching module 15 (e.g., refrigerant valve assembly 154). The first operating position, in addition to connecting the second end of the heat exchange branch 03 to the second branch 152, blocking the third branch 153, and blocking the first branch 151, can also connect the second end of the connecting branch 18 to the first end of the heat exchange branch 03. The second operating position, in addition to connecting the second end of the heat exchange branch 03 to the third branch 153, blocking the second branch 152, and connecting the first branch 151, can also block the second end of the connecting branch 18 from the first end of the heat exchange branch 03.

[0136] To better illustrate the effect of the refrigerant flow direction being in the second state under low load in this embodiment, a simulation was performed using an 18kW multi-split air conditioning system. The parameter changes and effects are as follows:

[0137]

[0138]

[0139] Furthermore, this embodiment of the invention also proposes a storage medium storing a control program for an air conditioner. When the control program for the air conditioner is executed by a processor, it implements the relevant steps of any embodiment of the control method for the air conditioner described above.

[0140] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or system. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or system that includes that element.

[0141] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0142] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0143] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A heat pump system, characterized in that, The heat pump system includes: A refrigerant circulation loop includes a compressor, a first heat exchanger, and a second heat exchanger. The compressor has an exhaust port, a return port, and a make-up port. When the heat pump system is in a first mode, the exhaust port is connected to the first heat exchanger, the return port is connected to the second heat exchanger, and the pipeline between the first heat exchanger and the second heat exchanger includes a first pipeline. The first heat exchanger is in a condensing state and the second heat exchanger is in an evaporating state in the first mode. A heat exchange branch is connected to the first pipeline for heat exchange. A connecting branch, the first end of which is connected to the first pipeline; The flow direction switching module is used to switch the refrigerant flow direction between the first and second states when the heat pump system is in the first state. In the first state, the refrigerant flowing out of the second end of the connecting branch flows through the heat exchange branch and enters the gas inlet. In the second state, the refrigerant flowing out of the second end of the connecting branch flows through the heat exchange branch and enters the gas inlet. When the heat pump system is in the first mode, the pipeline between the second heat exchanger and the return gas port includes a second pipeline, and the flow direction switching module includes: The first branch, the first end of the second pipeline is connected to the first end of the heat exchange branch through the first branch, and the second end of the connecting branch is connected to the first end of the heat exchange branch; The second branch, the second end of the heat exchange branch is connected to the air inlet through the second branch; The third branch is formed by connecting the second end of the second pipeline to the second end of the heat exchange branch via the third branch. A refrigerant valve assembly, wherein the first branch, the second branch, and the third branch are all connected to the refrigerant valve assembly, and the refrigerant valve assembly has a first operating position and a second operating position. In the first operating position, the second end of the heat exchange branch is connected to the second branch, the third branch is blocked, and the first branch is blocked. In the second operating position, the second end of the heat exchange branch is connected to the third branch, the second branch is blocked, and the first branch is connected.

2. The heat pump system as described in claim 1, characterized in that, The refrigerant valve assembly includes: The first three-way valve is used to connect the second end of the heat exchange branch, the second branch, and the third branch. The second three-way valve connects the first end of the first branch, the first end of the second pipeline, and the second heat exchanger.

3. The heat pump system as described in claim 1 or 2, characterized in that, The number of the first heat exchanger and / or the second heat exchanger is more than one; And / or, the connecting branch includes a throttle valve.

4. A control method for an air conditioner, based on a heat pump system as described in any one of claims 1 to 3, characterized in that, The control method for the air conditioner includes: When the heat pump system is in the first mode, the status parameters of the air conditioner are acquired, and the status parameters characterize the load of the air conditioner. When the state parameter does not meet the preset condition, the flow direction switching module is controlled to operate so that the refrigerant flow direction in the refrigerant circulation loop reaches the first state. When the state parameter meets the preset condition, the flow direction switching module is controlled to operate so that the refrigerant flow direction in the refrigerant circulation loop reaches the second state. The preset condition indicates that the demand load of the air conditioner is less than the preset load.

5. The control method for an air conditioner as described in claim 4, characterized in that, The pipeline between the second heat exchanger and the return gas port includes a second pipeline, and the flow direction switching module includes a first branch, a second branch, a third branch, and a refrigerant valve assembly; The step of controlling the flow direction switching module to operate so that the refrigerant flow direction in the refrigerant circulation loop reaches the first state when the state parameter does not meet the preset conditions includes: When the state parameters do not meet the preset conditions, the refrigerant valve assembly is controlled to operate in the first operating position, so that the refrigerant flowing out of the connecting branch flows sequentially through the heat exchange branch, the second branch and enters the air inlet, and the refrigerant flow in the first branch and the third branch is stopped. The step of controlling the flow direction switching module to operate so that the refrigerant flow direction in the refrigerant circulation loop reaches the second state when the state parameter meets the preset condition includes: When the state parameters meet the preset conditions, the refrigerant valve assembly is controlled to operate in the second operating position, so that the refrigerant flowing out of the second heat exchanger flows sequentially through the first branch, the heat exchange branch and the third branch before entering the return port, and the refrigerant flow in the second branch stops.

6. The control method for an air conditioner as described in claim 5, characterized in that, The refrigerant valve assembly includes a first three-way valve and a second three-way valve, and the step of controlling the refrigerant valve assembly to operate in a first operating position includes: The first three-way valve is controlled to operate in the first valve position and the second three-way valve is controlled to operate in the third valve position. In the first valve position, the heat exchange branch is connected to the second branch and the heat exchange branch is disconnected from the third branch. In the third valve position, the second heat exchanger is connected to the second pipeline and the second heat exchanger is disconnected from the first branch. The first operating position includes the first valve position and the third valve position. The step of controlling the refrigerant valve assembly to operate in the second operating position includes: The first three-way valve is controlled to operate in the second valve position and the second three-way valve is controlled to operate in the fourth valve position. In the second valve position, the heat exchange branch is disconnected from the second branch and the heat exchange branch is connected to the third branch. In the fourth valve position, the second heat exchanger is disconnected from the second pipeline and the second heat exchanger is connected to the first end of the first branch. The second operating position includes the second valve position and the fourth valve position.

7. The control method for an air conditioner as described in any one of claims 4 to 6, characterized in that, The status parameters include the compressor frequency of the air conditioner, and the preset condition includes the compressor frequency being less than a preset frequency.

8. The control method for an air conditioner as described in claim 7, characterized in that, The ambient temperature of the environment where the air conditioner is located is obtained, and the preset frequency is determined based on the ambient temperature.

9. The control method for an air conditioner as described in any one of claims 4 to 6, characterized in that, The connecting branch includes a throttle valve, and after the step of obtaining the status parameters of the air conditioner, it further includes: When the state parameter does not meet the preset condition, control the throttle valve to open and execute the step of controlling the flow direction switching module to make the refrigerant flow direction in the refrigerant circulation loop reach the first state. When the state parameter meets the preset condition, control the throttle valve to close and execute the step of controlling the flow direction switching module to make the refrigerant flow direction in the refrigerant circulation loop reach the second state.

10. An air conditioner, characterized in that, The air conditioner includes: The heat pump system as described in any one of claims 1 to 3; A control device, wherein the heat pump system is connected to the control device, the control device comprising: a memory, a processor, and an air conditioner control program stored in the memory and executable on the processor, wherein the air conditioner control program, when executed by the processor, implements the steps of the air conditioner control method as described in any one of claims 4 to 9.

11. A storage medium, characterized in that, The storage medium stores a control program for an air conditioner, which, when executed by a processor, implements the steps of the control method for an air conditioner as described in any one of claims 4 to 9.

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