Control method of heat pump system, heat pump system and storage medium

Abstract

The invention discloses a control method of a heat pump system, the heat pump system and a storage medium. The heat pump system comprises a compressor, an indoor heat exchanger, a first control valve, a throttling device, an outdoor heat exchanger and a refrigerant branch, the indoor heat exchanger, the first control valve, the throttling device and the outdoor heat exchanger are connected, the refrigerant branch comprises an energy storage device, and the first end of the refrigerant branch is connected with an exhaust port of the compressor; the pipeline between the first control valve and the throttling device is connected with the second end of the refrigerant branch, and the method comprises the steps that when the heat pump system operates in a preset energy storage mode in a first state, the first control valve is controlled to operate at a target opening degree so that a refrigerant can be stored in the indoor heat exchanger; in the first state, an air return port of the compressor is connected with the outdoor heat exchanger, and an exhaust port of the compressor is connected with the indoor heat exchanger. The invention aims to improve the operation reliability of the heat pump system in a separate energy storage mode.

Description

Technical Field

[0001] The present invention relates to the technical field of heat pumps, and in particular to a control method for a heat pump system, a heat pump system and a storage medium. Background Art

[0002] Some heat pump systems are equipped with energy storage devices such as water tanks, which can store part of the refrigerant energy in the system. In particular, heat pump systems often need to store energy during the cooling or heating process, and the system will be filled with more refrigerant. However, when the heat pump system is in a separate energy storage mode, the refrigerant discharged by the compressor will all flow into the branch where the energy storage device is located for heat exchange. Too much refrigerant circulating in the system will lead to high high pressure and insufficient exhaust superheat, reducing the reliability of system operation. Summary of the invention

[0003] The main purpose of the present invention is to provide a control method for a heat pump system, a heat pump system and a storage medium, aiming to improve the operating reliability of the heat pump system in a single energy storage mode.

[0004] To achieve the above-mentioned purpose, the present invention provides a control method for a heat pump system, the heat pump system comprising a compressor, an indoor heat exchanger, a first control valve, a throttling device, an outdoor heat exchanger and a refrigerant branch, the indoor heat exchanger, the first control valve, the throttling device and the outdoor heat exchanger are connected, the refrigerant branch comprises an energy storage device, the first end of the refrigerant branch is connected to the exhaust port of the compressor, or the first end of the refrigerant branch is connected to the exhaust port of the compressor through a reversing component, the pipeline between the first control valve and the throttling device is connected to the second end of the refrigerant branch, and the control method of the heat pump system comprises the following steps:

[0005] When the heat pump system operates in a preset energy storage mode in the first state, the first control valve is controlled to operate at a target opening so that the refrigerant is stored in the indoor heat exchanger;

[0006] Wherein, in the first state, the return air port of the compressor is connected to the outdoor heat exchanger, and the exhaust air port of the compressor is connected to the indoor heat exchanger.

[0007] Optionally, the heat pump system further includes a reversing component, the indoor heat exchanger, the return air port of the compressor, the exhaust port of the compressor, and the outdoor heat exchanger are all connected to the reversing component, and when the heat pump system operates in a preset energy storage mode in the first state, before the step of controlling the first control valve to operate at a target opening so that the refrigerant is stored in the indoor heat exchanger, it also includes:

[0008] When the heat pump system is in a preset mode and the indoor unit where the indoor heat exchanger is located meets the shutdown condition, the indoor fan corresponding to the indoor heat exchanger is controlled to be turned off, the reversing component is controlled to switch the operating state so that the heat pump system enters the first state, and the heat pump system is controlled to start the preset energy storage mode;

[0009] Wherein, in the preset mode, the indoor heat exchanger is in an evaporating state.

[0010] Optionally, the reversing component includes a first four-way valve and a second four-way valve, the exhaust port, the return air port, the indoor heat exchanger and the first blocking member are respectively connected to different valve ports of the first four-way valve, the pipeline between the return air port and the first four-way valve, the exhaust port, the outdoor heat exchanger and the second blocking member are respectively connected to different valve ports of the second four-way valve, and the step of controlling the reversing component to switch the operating state so that the heat pump system enters the first state includes:

[0011] Controlling the first four-way valve to switch to the second valve position for operation, and controlling the second four-way valve to switch to the third valve position for operation;

[0012] In the second valve position, the exhaust port is connected to the indoor heat exchanger, and the return air port is connected to the first blocking member. In the third valve position, the return air port is connected to the outdoor heat exchanger, and the exhaust port is connected to the second blocking member.

[0013] Optionally, the control method of the heat pump system further includes:

[0014] In the preset mode, the first four-way valve is controlled to operate at a first valve position, the second four-way valve is controlled to operate at a fourth valve position, and the first control valve is controlled to operate at a throttling opening;

[0015] In the first valve position, the exhaust port is connected to the first blocking member, and the return air port is connected to the indoor heat exchanger. In the fourth valve position, the second blocking member is connected to the return air port, and the exhaust port is connected to the outdoor heat exchanger.

[0016] Optionally, the heat pump system further includes a heat dissipation module disposed between the first control valve and the throttling device, the heat dissipation module is used to dissipate heat from a heat generating component, the throttling device includes a second control valve, a pipeline between the heat dissipation module and the first control valve is connected to the second end of the refrigerant branch, and the control method of the heat pump system further includes:

[0017] In the preset mode, the second control valve is controlled to operate at an opening greater than a preset opening.

[0018] Optionally, the control method of the heat pump system further includes:

[0019] In the preset mode, when the cooling demand of the indoor heat exchanger is greater than or equal to the energy storage demand of the energy storage device, the steps of controlling the first four-way valve to operate at the first valve position, controlling the second four-way valve to operate at the fourth valve position, and controlling the first control valve to operate at a throttling opening are executed.

[0020] Optionally, the throttling device includes a second control valve, and the control method of the heat pump system further includes:

[0021] In the preset mode, the first four-way valve is controlled to operate at a first valve position, the second four-way valve is controlled to operate at a third valve position, and both the first control valve and the second control valve are controlled to operate at a throttling opening;

[0022] In the first valve position, the exhaust port is connected to the first blocking member, and the return air port is connected to the indoor heat exchanger. In the third valve position, the return air port is connected to the outdoor heat exchanger, and the exhaust port is connected to the second blocking member.

[0023] Optionally, the control method of the heat pump system further includes:

[0024] In the preset mode, when the cooling demand of the indoor heat exchanger is less than the energy storage demand of the energy storage device, the steps of controlling the first four-way valve to operate at the first valve position, controlling the second four-way valve to operate at the third valve position, and controlling both the first control valve and the second control valve to operate at a throttling opening are executed.

[0025] Optionally, the refrigerant branch further includes a third control valve, and the control method of the heat pump system further includes:

[0026] In the preset mode or the preset energy storage mode, the third control valve is controlled to operate with an opening greater than a preset opening.

[0027] Optionally, after the step of controlling the first control valve to operate at a target opening so that the refrigerant is stored in the indoor heat exchanger, the method further includes:

[0028] Obtaining a subcooling degree of the indoor heat exchanger;

[0029] When the degree of subcooling is greater than a preset degree of subcooling, controlling the first control valve to increase its opening;

[0030] When the degree of subcooling is less than the preset degree of subcooling, the first control valve is controlled to reduce its opening degree.

[0031] In addition, in order to achieve the above-mentioned purpose, the present application also proposes a heat pump system, which includes a control device, a compressor, an indoor heat exchanger, a first control valve, a throttling device, an outdoor heat exchanger and a refrigerant branch, wherein the indoor heat exchanger, the first control valve, the throttling device and the outdoor heat exchanger are connected, the refrigerant branch includes an energy storage device, the first end of the refrigerant branch is connected to the exhaust port of the compressor, or the first end of the refrigerant branch is connected to the exhaust port of the compressor through a reversing component, and the pipeline between the first control valve and the throttling device is connected to the second end of the refrigerant branch;

[0032] The first control valve is connected to the control device, which includes: a memory, a processor, and a control program for the heat pump system stored in the memory and executable on the processor, wherein the control program for the heat pump system implements the steps of the control method for the heat pump system as described in any one of the above items when executed by the processor.

[0033] In addition, in order to achieve the above-mentioned purpose, the present application also proposes a storage medium, on which a control program of a heat pump system is stored. When the control program of the heat pump system is executed by a processor, the steps of the control method of the heat pump system as described in any of the above items are implemented.

[0034] The present invention proposes a control method for a heat pump system. In addition to a compressor, an indoor heat exchanger, a first control valve, a throttling device and an outdoor heat exchanger, the system is also provided with a refrigerant branch including an energy storage device, one end of the refrigerant branch is connected to the exhaust port of the compressor, and a pipeline between the first control valve and the throttling device is connected to the other end of the refrigerant branch. When the heat pump system operates in a preset energy storage mode in a state in which the return air port of the compressor is connected to the outdoor heat exchanger and the exhaust port of the compressor is connected to the indoor heat exchanger, a part of the refrigerant is stored in the indoor heat exchanger by controlling the first control valve to operate at a target opening, and the other part of the refrigerant used for energy storage can circulate among the refrigerant branch, the throttling device, the outdoor heat exchanger and the compressor, thereby effectively reducing the amount of refrigerant circulating in the preset energy storage mode, effectively avoiding problems such as high pressure and insufficient exhaust superheat caused by excessive refrigerant, and improving the operating reliability of the heat pump system in a separate energy storage mode. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A schematic diagram of a refrigerant pipeline of an embodiment of a heat pump system of the present invention and a schematic diagram of the refrigerant flow direction in a first mode;

[0036] Figure 2 A schematic diagram of a refrigerant pipeline of an embodiment of a heat pump system of the present invention and a schematic diagram of the refrigerant flow direction in a second mode;

[0037] Figure 3A schematic diagram of a refrigerant pipeline of an embodiment of a heat pump system of the present invention and a schematic diagram of the refrigerant flow direction in a third mode;

[0038] Figure 4 A schematic diagram of a refrigerant pipeline of an embodiment of a heat pump system of the present invention and a schematic diagram of the refrigerant flow direction in a fourth mode;

[0039] Figure 5 A schematic diagram of a refrigerant pipeline of an embodiment of a heat pump system of the present invention and a schematic diagram of the refrigerant flow direction in a fifth mode;

[0040] Figure 6 A schematic diagram of a refrigerant pipeline of an embodiment of a heat pump system of the present invention and a schematic diagram of the refrigerant flow direction in a sixth mode;

[0041] Figure 7 A schematic diagram of the hardware structure involved in the operation of an embodiment of a heat pump system of the present invention;

[0042] Figure 8 A schematic flow chart of an embodiment of a control method for a heat pump system of the present invention;

[0043] Fig. 9 A schematic flow chart of another embodiment of a control method for a heat pump system of the present invention;

[0044] Fig.10 This is a flow chart of another embodiment of a control method for a heat pump system of the present invention.

[0045] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0046] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0047] An embodiment of the present invention provides a heat pump system.

[0048] In the embodiment of the present invention, refer to Figures 1 to 7 The heat pump system includes a control device 100, a refrigerant main circuit and a refrigerant branch circuit connected to the refrigerant main circuit. The refrigerant main circuit includes an indoor unit, an outdoor heat exchanger 4 and a throttling device. The indoor unit includes an indoor heat exchanger 9 and a first control valve 7. The indoor heat exchanger 9, the first control valve 7, the throttling device and the outdoor heat exchanger 4 are connected in sequence. The refrigerant branch circuit includes an energy storage device 10 and a third control valve 6. The first end of the refrigerant branch circuit is connected to the exhaust port of the compressor 1 on the refrigerant main circuit, and the pipeline between the first control valve 7 and the throttling device is connected to the second end of the refrigerant branch circuit. The first control valve 7, the throttling device and the third control valve 6 are all connected to the control device 100.

[0049] In this embodiment, the first control valve 7, the throttling device (the second control valve 8) and the third control valve 6 are all electronic expansion valves. In other embodiments, the first control valve 7 and / or the throttling device and / or the third control valve 6 may also be other types of fluid components with adjustable flow.

[0050] The energy storage device 10 is loaded with energy storage materials. When the refrigerant in the refrigerant branch flows through the energy storage device 10, the energy storage materials absorb the heat or cold of the refrigerant and store it. In this embodiment, the energy storage device 10 is a water tank. In other embodiments, the energy storage device 10 may also be other types of devices made of energy storage materials with energy storage functions, such as a device loaded with molten salt. The energy storage device 10 may be a water tank (water heater).

[0051] The outdoor heat exchanger 4 is provided with an outdoor fan correspondingly, and the outdoor fan can drive the outdoor air to exchange heat with the outdoor heat exchanger 4. The indoor heat exchanger 9 is provided with an indoor fan correspondingly, and both the indoor fan and the outdoor fan are connected to the control device 100.

[0052] The refrigerant main circuit includes a compressor 1, an indoor unit, a throttling device and an outdoor heat exchanger 4. In this embodiment, the number of indoor units is more than one, the more than one indoor units are distributed in different indoor spaces, and the more than one indoor units are connected in parallel. In other embodiments, the number of indoor units may also be one.

[0053] In this embodiment, the throttling device includes a second control valve 8. In other embodiments, the throttling device may also be a throttling component whose opening is not adjustable, such as a capillary tube.

[0054] In this embodiment, the refrigerant main circuit also includes a reversing component connected to the control device 100, and the return air port of the compressor 1, the exhaust port of the compressor 1, the indoor heat exchanger 9 and the outdoor heat exchanger 4 are all connected to the reversing component.

[0055] In one implementation of the present embodiment, the reversing assembly includes a first four-way valve 2 and a second four-way valve 3, the exhaust port of the compressor 1, the indoor heat exchanger 9, the return air port of the compressor 1 and the first blocking member are respectively connected to different valve ports of the first four-way valve 2, and the exhaust port of the compressor 1, the return air port of the compressor 1, the outdoor heat exchanger 4 and the second blocking member are respectively connected to different valve ports of the second four-way valve 3.

[0056] The first four-way valve 2 has a first valve position and a second valve position. When the first four-way valve 2 is in the first valve position, the return air port of the compressor 1 is connected to the indoor heat exchanger 9, and the exhaust port is connected to the first blocking member. When the first four-way valve 2 is in the second valve position, the exhaust port of the compressor 1 is connected to the indoor heat exchanger 9, and the return air port is connected to the first blocking member. The first four-way valve 2 can be equivalent to a three-way valve. When the three-way valve is in the first state, the return air port of the compressor 1 is connected to the indoor heat exchanger 9; when the three-way valve is in the second state, the exhaust port of the compressor 1 is connected to the indoor heat exchanger 9.

[0057] The second four-way valve 3 has a third valve position and a fourth valve position. When the second four-way valve 3 is in the third valve position, the return air port of the compressor 1 is connected to the outdoor heat exchanger 4, and the exhaust port is connected to the second blocking member. When the second four-way valve 3 is in the fourth valve position, the exhaust port of the compressor 1 is connected to the outdoor heat exchanger 4, and the return air port is connected to the second blocking member. The second four-way valve 3 can be equivalent to a three-way valve. When the three-way valve is in the first state, the return air port of the compressor 1 is connected to the outdoor heat exchanger 4; when the three-way valve is in the second state, the exhaust port of the compressor 1 is connected to the outdoor heat exchanger 4.

[0058] In one implementation of this embodiment, the reversing assembly also includes a reversing valve (not shown), which may be a four-way valve or a three-way valve. The reversing valve has a first state and a second state. When the reversing valve is in the first state, the return air port of the compressor 1 is connected to the energy storage device 10; when the reversing valve is in the second state, the exhaust port of the compressor 1 is connected to the energy storage device 10.

[0059] Through the cooperation of the first four-way valve 2 and the second four-way valve 3, the heat pump system can switch between a variety of different modes:

[0060] Reference Figure 1 In the first mode, the indoor unit is in a cooling state, the energy storage device 10 is in an energy storage state, the first control valve 7 and the third control valve 6 are open, the first control valve 7 and / or the second control valve 8 are throttling, the first four-way valve 2 is operating in the first valve position, the second four-way valve 3 is operating in the fourth valve position, the exhaust port of the compressor 1 is connected to the energy storage device 10 (if the reversing assembly includes the above-mentioned reversing valve, the reversing valve is in the second state), and the refrigerant discharged from the compressor 1 in the refrigerant main circuit flows through the outdoor heat exchanger 4, the second control valve 8, the first control valve 7, and the indoor heat exchanger 9 in sequence before flowing back to the compressor 1, wherein part of the refrigerant flowing through the refrigerant main circuit can flow through the refrigerant branch circuit and store energy in the energy storage device 10. In the first mode, the indoor heat exchanger 9 is in an evaporating state, and the outdoor heat exchanger 4 is in a condensing state.

[0061] Reference Figure 2In the second mode, the indoor unit is in a cooling state, the energy storage device 10 is in an energy storage state, the first end of the refrigerant branch is connected to the exhaust port of the compressor 1, the first control valve 7 and the third control valve 6 are open, the first control valve 7 and the second control valve 8 are throttling, the first four-way valve 2 is operated in the first valve position, the second four-way valve 3 is operated in the third valve position, the exhaust port of the compressor 1 is connected to the energy storage device 10 (if the reversing assembly includes the above-mentioned reversing valve, the reversing valve is in the second state), the refrigerant discharged from the compressor 1 first flows into the refrigerant branch, and the energy is stored in the energy storage device 10, a part of the refrigerant flowing out of the refrigerant branch flows through the first control valve 7 and the indoor heat exchanger 9 and then flows back to the compressor 1, and another part of the refrigerant flowing out of the refrigerant branch flows through the second control valve 8 and the outdoor heat exchanger 4 and then flows back to the compressor 1. In the second mode, the indoor heat exchanger 9 is in an evaporating state, and the outdoor heat exchanger 4 is in an evaporating state.

[0062] Reference Figure 3 In the third mode, the indoor unit is in a cooling state, the energy storage device 10 is in a stopped energy storage state, the first control valve 7 is in throttling operation, the third control valve 6 is closed or operates at the minimum opening, the second control valve 8 is opened, the first four-way valve 2 operates at the first valve position, the second four-way valve 3 operates at the fourth valve position, the exhaust port of the compressor 1 is connected to the energy storage device 10 (if the reversing assembly includes the above-mentioned reversing valve, the reversing valve is in the second state), and the refrigerant discharged from the compressor 1 in the refrigerant main circuit flows through the outdoor heat exchanger 4, the second control valve 8, the first control valve 7, and the indoor heat exchanger 9 in sequence before flowing back to the compressor 1, wherein the energy storage device 10 stops storing energy. In the third mode, the indoor heat exchanger 9 is in an evaporating state, and the outdoor heat exchanger 4 is in a condensing state.

[0063] Reference Figure 4 In the fourth mode, the indoor unit stops heat exchange, the energy storage device 10 is in the energy storage state, the first control valve 7 is closed or operates at the minimum opening, the third control valve 6 is opened, the second control valve 8 is throttling, the first four-way valve 2 operates at the second valve position, the second four-way valve 3 operates at the third valve position, the exhaust port of the compressor 1 is connected to the energy storage device 10 (if the reversing assembly includes the above-mentioned reversing valve, the reversing valve is in the second state), and the refrigerant flowing out of the compressor 1 flows through the refrigerant branch, the second control valve 8, and the outdoor heat exchanger 4 in sequence and then flows back to the compressor 1. In the fourth mode, the outdoor heat exchanger 4 is in the evaporation state.

[0064] Reference Figure 5In the fifth mode, the indoor unit is in the heating state, the energy storage device 10 is in the energy storage state, the first control valve 7 and the third control valve 6 are open, the first control valve 7 and / or the second control valve 8 are throttling, the first four-way valve 2 is operated in the second valve position, the second four-way valve 3 is operated in the third valve position, the exhaust port of the compressor 1 is connected to the energy storage device 10 (if the reversing assembly includes the above-mentioned reversing valve, the reversing valve is in the second state), and the refrigerant discharged from the compressor 1 flows through the indoor heat exchanger 9, the first control valve 7, the second control valve 8, and the outdoor heat exchanger 4 in sequence and then flows back to the compressor 1, wherein part of the refrigerant flowing through the refrigerant main circuit can flow through the refrigerant branch circuit and store energy in the energy storage device 10. In the fifth mode, the indoor heat exchanger 9 is in the condensing state, and the outdoor heat exchanger 4 is in the evaporating state.

[0065] Reference Figure 6 In the sixth mode, the indoor unit is in the heating state and the energy storage device 10 is in the stopped energy storage state. The first control valve 7 is opened, the third control valve 6 is closed or operates at the minimum opening, the first control valve 7 and / or the second control valve 8 are throttling, the first four-way valve 2 operates at the second valve position, the second four-way valve 3 operates at the third valve position, the exhaust port of the compressor 1 is connected to the energy storage device 10 (if the reversing assembly includes the above-mentioned reversing valve, the reversing valve is in the second state), and the refrigerant discharged from the compressor 1 flows through the indoor heat exchanger 9, the first control valve 7, the second control valve 8, and the outdoor heat exchanger 4 in sequence and then flows back to the compressor 1, wherein the energy storage device 10 stops storing energy. In the sixth mode, the indoor heat exchanger 9 is in the condensing state, and the outdoor heat exchanger 4 is in the evaporating state.

[0066] In another implementation of this embodiment, the reversing assembly includes a third four-way valve, and the exhaust port of the compressor 1, the return port of the compressor 1, the indoor heat exchanger 9, and the outdoor heat exchanger 4 are respectively connected to different valve ports of the third four-way valve. Alternatively, the first four-way valve 2 and the second four-way valve 3 in the reversing assembly can be replaced by the first three-way valve and the second three-way valve, respectively, and the blocking member and the valve port connected thereto are eliminated.

[0067] In other embodiments, the heat pump system may not include a reversing component, and the exhaust port of the compressor 1 in the main refrigerant circuit, the indoor heat exchanger 9, the first control valve 7, the second control valve 8, the outdoor heat exchanger 4, and the return air port of the compressor 1 are connected in sequence.

[0068] Further, in this embodiment, referring to Figures 1 to 6 The heat pump system also includes a heat dissipation module 5 arranged between the first control valve 7 and the throttling device, the heat dissipation module 5 is used to dissipate heat from the heat-generating components, the throttling device includes a second control valve 8, and the pipeline between the heat dissipation module 5 and the first control valve 7 is connected to the second end of the refrigerant branch.

[0069] Further, see Figure 7The heat pump system further includes a temperature sensor 01 disposed in the indoor unit for detecting the indoor ambient temperature. The temperature sensor 01 is connected to the control device 100. Specifically, the temperature sensor 01 may be disposed at a return air outlet on the indoor unit that is connected to the corresponding indoor space.

[0070] In the embodiment of the present invention, refer to Figure 7 The control device 100 of the heat pump system includes: a processor 1001, such as a CPU, a memory 1002, and a timer 1003. Among them, these components are connected and communicated through a communication bus. The memory 1002 can be a high-speed RAM memory or a stable memory (non-volatile memory), such as a disk memory. The memory 1002 can also be a storage device independent of the aforementioned processor 1001.

[0071] Those skilled in the art will understand that Figure 7 The device structure shown in the figure does not constitute a limitation of the device, and may include more or less components than shown in the figure, or combine certain components, or arrange the components differently.

[0072] like Figure 7 As shown, the memory 1002 as a computer storage medium may include a control program for the heat pump system.

[0073] exist Figure 7 In the device shown, the processor 1001 can be used to call the control program of the heat pump system stored in the memory 1002, and execute the relevant step operations of the control method of the heat pump system in the following embodiment.

[0074] An embodiment of the present invention further provides a control method for a heat pump system, which is applied to the above-mentioned heat pump system.

[0075] Reference Figure 8 , an embodiment of a control method of a heat pump system of the present application is proposed. In this embodiment, the control method of the heat pump system includes:

[0076] Step S10, when the heat pump system operates in a preset energy storage mode in a first state, the first control valve is controlled to operate at a target opening so that the refrigerant is stored in the indoor heat exchanger; wherein, in the first state, the return air port of the compressor is connected to the outdoor heat exchanger, and the exhaust port of the compressor is connected to the indoor heat exchanger.

[0077] In the first state, the indoor heat exchanger is in a heat releasing state, and the outdoor heat exchanger is in a heat absorbing state.

[0078] In this embodiment, the heat pump system is a system in which the heat exchange state of the heat exchanger can be switched. Based on this, the heat pump system can be placed in the first state by controlling the operation of the reversing component. In one implementation of this embodiment, the reversing component includes the first four-way valve and the second four-way valve, the first four-way valve is operated in the second valve position, and the second four-way valve is operated in the third valve position, so that the heat pump system is in the first state. In another implementation of this embodiment, the reversing component includes a third four-way valve, and the third four-way valve is controlled to operate in the fifth valve position to put the heat pump system in the first state.

[0079] In other embodiments, the heat pump system is a system in which the heat exchange state of the heat exchanger cannot be switched. Based on this, the exhaust port of the compressor, the indoor heat exchanger, the throttling device, the outdoor heat exchanger and the return air port of the compressor in the heat pump system are connected in sequence, and the heat pump system is fixed in the first state.

[0080] In this embodiment, the preset energy storage mode is a separate energy storage mode. In the preset energy storage mode, the indoor heat exchanger has no heat exchange demand, and the energy storage device has an energy storage demand. In the preset energy storage mode, the indoor fan in the indoor unit is turned off. In the preset energy storage mode, when a refrigerant valve is provided on the refrigerant branch, the relevant refrigerant valve can be controlled to open. In this embodiment, the refrigerant valve on the refrigerant branch in the preset energy storage mode is opened at the maximum opening.

[0081] The target opening is any opening greater than 0 that allows the refrigerant to be stored in the indoor heat exchanger. The target opening may be less than or equal to 30% of the maximum opening of the first control valve. In this embodiment, the target opening is the minimum opening of the first control valve.

[0082] The target opening can be a preset fixed opening, for example, the target opening can be 50 steps. Alternatively, the target opening can also be an opening value determined according to the actual operation of the heat pump system. For example, the target opening can be determined according to the subcooling degree of the indoor heat exchanger and / or the temperature of the energy storage device and / or the operating frequency of the compressor and / or the temperature difference between the temperature of the energy storage device and the corresponding set temperature and / or the speed of the outdoor fan.

[0083] When the heat pump system is in the first state, part of the refrigerant discharged from the compressor flows into the refrigerant branch to provide heat for the energy storage of the energy storage device. The refrigerant after flowing through the energy storage device flows through the throttling device and the outdoor heat exchanger in turn and then flows back to the compressor; another part of the refrigerant discharged from the compressor flows into the indoor heat exchanger. Under the restriction of the target opening of the first control valve, only a small part of the refrigerant flows out of the first control valve. The indoor heat exchanger is in a high-pressure state. Another part of the refrigerant discharged from the compressor can be stored in the indoor heat exchanger. Based on this, the high pressure of the system can be relieved and diverted, and the refrigerant involved in the circulation will be reduced, effectively reducing the high-pressure pressure and increasing the exhaust superheat, thereby improving the reliability of the system. It should be noted that when the first control valve is closed, due to the presence of refrigerant in the indoor heat exchanger itself for liquid sealing, the refrigerant discharged from the compressor will not flow into the indoor heat exchanger but will all flow through the refrigerant branch.

[0084] Wherein, when the throttling device includes a second control valve, in a preset energy storage mode, the first control valve is controlled to operate at a target opening while the second control valve is controlled to operate at a throttling opening.

[0085] A control method for a heat pump system is proposed in an embodiment of the present invention. In addition to a compressor, an indoor heat exchanger, a first control valve, a throttling device and an outdoor heat exchanger, the system is also provided with a refrigerant branch including an energy storage device, one end of the refrigerant branch is connected to the exhaust port of the compressor, and a pipeline between the first control valve and the throttling device is connected to the other end of the refrigerant branch. When the heat pump system operates in a preset energy storage mode in a state in which the return air port of the compressor is connected to the outdoor heat exchanger and the exhaust port of the compressor is connected to the indoor heat exchanger, a part of the refrigerant is stored in the indoor heat exchanger by controlling the first control valve to operate at a target opening, and the other part of the refrigerant used for energy storage can circulate between the refrigerant branch, the throttling device, the outdoor heat exchanger and the compressor, thereby effectively reducing the amount of refrigerant participating in the circulation in the preset energy storage mode, effectively avoiding problems such as high pressure and insufficient exhaust superheat caused by excessive refrigerant, and improving the operating reliability of the heat pump system in a separate energy storage mode.

[0086] Further, based on the above embodiment, another embodiment of the control method of the heat pump system of the present application is proposed. In this embodiment, the heat pump system further includes a reversing component, and the indoor heat exchanger, the return air port of the compressor, the exhaust port of the compressor, and the outdoor heat exchanger are all connected to the reversing component. Fig. 9 , before step S10, it also includes:

[0087] Step S01, when the heat pump system is in a preset mode and the indoor unit where the indoor heat exchanger is located meets the shutdown condition, the indoor fan corresponding to the indoor heat exchanger is controlled to be turned off, the reversing component is controlled to switch the operating state to make the heat pump system enter the first state, and the heat pump system is controlled to start the preset energy storage mode; wherein, in the preset mode, the indoor heat exchanger is in an evaporating state.

[0088] In the preset mode, the indoor environment corresponding to the indoor unit has a heat exchange demand. The preset mode may include the first mode, the second mode, or the third mode mentioned above.

[0089] In this embodiment, the preset mode is a cooling mode, and the indoor heat exchanger is in an evaporating state to reduce the indoor ambient temperature. In other embodiments, the preset mode may also be other modes in which the indoor heat exchanger is in an evaporating state, such as a dehumidification mode.

[0090] In this embodiment, when the heat pump system is in a preset mode, the corresponding indoor ambient temperature can be detected, and when the indoor ambient temperature is less than or equal to the set temperature of the indoor unit, it can be determined that the shutdown condition is met. In other embodiments, when the heat pump system is in a preset mode, the corresponding indoor ambient humidity can be detected, and when the indoor ambient humidity is less than or equal to the set humidity of the indoor unit, it can be determined that the shutdown condition is met.

[0091] In this embodiment, the control device is arranged in the outdoor unit, and a preset identification instruction can be sent to the indoor unit, so that the indoor unit controls the indoor fan to be turned off after receiving the preset identification instruction.

[0092] In this embodiment, the energy storage device in the preset mode is in the energy storage state, then part of the refrigerant discharged from the compressor flows through the outdoor heat exchanger, the throttling device, and the indoor heat exchanger and then flows back to the compressor, and the other part of the refrigerant discharged from the compressor flows through the energy storage device, the indoor heat exchanger or the outdoor heat exchanger and then flows back to the compressor. In other embodiments, the energy storage device in the preset mode may also be in the energy storage stop state, then the refrigerant discharged from the compressor stops flowing into the refrigerant branch, and all circulates in the refrigerant main circuit for heat exchange.

[0093] When the indoor unit reaches the shutdown condition, the indoor fan is turned off to stop the indoor air from exchanging heat with the indoor heat exchanger. On this basis, the indoor heat exchanger is switched from a low-pressure state to a high-pressure state by reversing the reversing component, and the preset energy storage mode is turned on to make the first control valve operate according to the target opening, so that the refrigerant circulating in the heat pump system is not needed for indoor heat exchange but only for energy storage, and the excess refrigerant can be stored in the indoor unit in a high-pressure state. Since the indoor fan is turned off, hot air can be prevented from being sent into the indoor environment to affect comfort, thereby improving the system operation reliability in the single energy storage mode while ensuring indoor comfort.

[0094] Further, in this embodiment, the reversing component includes a first four-way valve and a second four-way valve, the exhaust port, the return air port, the indoor heat exchanger and the first blocking member are respectively connected to different valve ports of the first four-way valve, the pipeline between the return air port and the first four-way valve, the exhaust port, the outdoor heat exchanger and the second blocking member are respectively connected to different valve ports of the second four-way valve, and the step of controlling the reversing component to switch the operating state so that the heat pump system enters the first state includes:

[0095] Control the first four-way valve to switch to the second valve position, and control the second four-way valve to switch to the third valve position; under the second valve position, the exhaust port is connected to the indoor heat exchanger, and the return air port is connected to the first blocking piece, and under the third valve position, the return air port is connected to the outdoor heat exchanger, and the exhaust port is connected to the second blocking piece.

[0096] With the coordination of the valve positions of the first four-way valve and the second four-way valve, a part of the refrigerant flowing out of the compressor flows through the refrigerant branch, the second control valve, and the outdoor heat exchanger in sequence, and then flows back to the compressor. The energy of the refrigerant is stored in the energy storage device when flowing through the refrigerant branch; another part of the refrigerant flowing out of the compressor flows into the indoor heat exchanger, and a large amount of refrigerant is stored in the indoor heat exchanger under the flow limiting effect of the first control valve operating at the target opening. A small amount of refrigerant flows out of the first control valve and merges with the refrigerant flowing out of the refrigerant branch, then flows through the second control valve and the outdoor heat exchanger and then flows back to the compressor.

[0097] In this embodiment, through the cooperation of the first four-way valve and the second four-way valve, the heat pump system can store energy in the energy storage device alone when there is no indoor heat exchange demand, thereby effectively improving the energy utilization rate of the heat pump system.

[0098] Furthermore, in an implementation of the preset mode of the present embodiment, the control method of the heat pump system also includes: in the preset mode, controlling the first four-way valve to operate at a first valve position, controlling the second four-way valve to operate at a fourth valve position, and controlling the first control valve to operate at a throttling opening; under the first valve position, the exhaust port is connected to the first blocking part, and the return air port is connected to the indoor heat exchanger, and under the fourth valve position, the second blocking part is connected to the return air port, and the exhaust port is connected to the outdoor heat exchanger.

[0099] In this embodiment, the preset mode includes the first mode described above, and the refrigerant discharged from the compressor in the refrigerant main circuit flows through the outdoor heat exchanger, the second control valve, the first control valve, the indoor heat exchanger in sequence, and then flows back to the compressor. Wherein, when the refrigerant branch circuit is in a conducting state, part of the refrigerant flowing through the refrigerant main circuit can flow through the refrigerant branch circuit and store energy in the energy storage device.

[0100] In the first mode, the indoor heat exchanger is in an evaporating state and absorbs heat, the outdoor heat exchanger is in a condensing state and releases heat, and the heat pump system is in a partial heat recovery state. Heat can be absorbed into the system through the indoor heat exchanger, and excess heat in the refrigerant can be stored in the energy storage device.

[0101] In this embodiment, the first four-way valve and the second four-way valve cooperate with each other to meet the cooling demand of the indoor environment while storing a small amount of heat in the energy storage device.

[0102] Furthermore, in this embodiment, the heat pump system also includes a heat dissipation module arranged between the first control valve and the throttling device, the heat dissipation module is used to dissipate heat from heat-generating components, the throttling device includes a second control valve, and the pipeline between the heat dissipation module and the first control valve is connected to the second end of the refrigerant branch. The control method of the heat pump system also includes: in the preset mode, controlling the second control valve to operate with an opening greater than a preset opening.

[0103] The preset opening degree may be 70% of the maximum opening degree of the second control valve.

[0104] In this embodiment, the second control valve is controlled to operate at a maximum opening. In other embodiments, the second control valve can also operate at an opening smaller than the maximum opening but larger than a preset opening.

[0105] Specifically, the opening degree of the second control valve may be determined according to the temperature of the heat dissipation module and the dew point temperature of the environment where the heat dissipation module is located.

[0106] In this embodiment, the second control valve is operated with a larger opening, which can effectively prevent the refrigerant flowing into the heat dissipation module from having too low a temperature, thereby effectively preventing condensation in the heat dissipation module.

[0107] In other embodiments, when the heat dissipation module is not provided, the second control valve may also operate at a throttling opening, that is, operate at an opening that is less than or equal to a preset opening.

[0108] Furthermore, in another implementation of the preset mode of the present embodiment, the throttling device includes a second control valve, and the control method of the heat pump system also includes: in the preset mode, controlling the first four-way valve to operate at a first valve position, controlling the second four-way valve to operate at a third valve position, and controlling both the first control valve and the second control valve to operate at a throttling opening; under the first valve position, the exhaust port is connected to the first blocking piece, and the return air port is connected to the indoor heat exchanger, and under the third valve position, the return air port is connected to the outdoor heat exchanger, and the exhaust port is connected to the second blocking piece.

[0109] In this embodiment, the preset mode includes the above-mentioned second mode, the refrigerant discharged from the compressor first flows into the refrigerant branch, and the energy is stored in the energy storage device, a part of the refrigerant flowing out of the refrigerant branch flows through the first control valve and the indoor heat exchanger and then flows back to the compressor, and another part of the refrigerant flowing out of the refrigerant branch flows through the second control valve and the outdoor heat exchanger and then flows back to the compressor. Among them, the refrigerant branch is in a conducting state, and the refrigerant discharged from the compressor can all flow into the refrigerant branch and store the energy in the energy storage device.

[0110] In the second mode, the indoor heat exchanger and the outdoor heat exchanger are both in the evaporation state to absorb heat, and the heat pump system is in a full heat recovery state. The heat from the indoor and outdoor environments can be absorbed into the system through the indoor heat exchanger and the outdoor heat exchanger respectively, and the excess heat in the refrigerant can be stored in the energy storage device.

[0111] In this embodiment, the first four-way valve and the second four-way valve cooperate with each other to meet the cooling demand of the indoor environment while storing a large amount of heat in the energy storage device.

[0112] Furthermore, in another implementation of the preset mode of the present embodiment, the control method of the heat pump system also includes: in the preset mode, obtaining a demand state of the heat pump system, and when the demand state is that the cooling demand of the indoor heat exchanger is greater than or equal to the energy storage demand of the energy storage device, executing the steps of controlling the first four-way valve to operate at the first valve position, controlling the second four-way valve to operate at the fourth valve position, and controlling the first control valve to operate at a throttling opening; when the demand state is that the cooling demand of the indoor heat exchanger is less than the energy storage demand of the energy storage device, executing the steps of controlling the first four-way valve to operate at the first valve position, controlling the second four-way valve to operate at the third valve position, and controlling both the first control valve and the second control valve to operate at a throttling opening.

[0113] Among them, a first temperature difference between the indoor temperature of the indoor environment where the indoor heat exchanger is located and the set temperature can be obtained, and a second temperature difference between the current temperature of the energy storage device and the target energy storage temperature can be obtained, and the demand state here is determined according to the first temperature difference and the second temperature difference. For example, when the first temperature difference is greater than or equal to the second temperature difference, the cooling demand is greater than or equal to the energy storage demand; when the first temperature difference is less than the second temperature difference, the cooling demand is less than the energy storage demand. In other embodiments, a first ratio of the indoor temperature to the set temperature can also be determined, and a second ratio of the current temperature of the energy storage device to the target energy storage temperature can be determined, and the demand state here is determined according to the first ratio and the second ratio.

[0114] In this embodiment, when the cooling demand is greater than the energy storage demand, a partial heat recovery method such as indoor heat exchanger absorbing heat and outdoor heat exchanger releasing heat is used for cooling operation, which is beneficial to avoid excessive heat recovery affecting the cooling capacity of the heat pump system, thereby improving the cooling comfort of the indoor environment while storing energy; when the cooling demand is smaller than the energy storage demand, a full heat recovery method such as indoor and outdoor heat exchangers absorbing heat is used for cooling operation, which is beneficial to meet the indoor cooling comfort while ensuring that the system has enough heat to meet the energy storage demand of the energy storage device, thereby improving the energy storage efficiency of the refrigeration process.

[0115] Further, based on any of the above embodiments, another embodiment of the control method of the heat pump system of the present application is proposed. In this embodiment, the refrigerant branch also includes a third control valve, and the control method of the air conditioner also includes: in the preset mode or the preset energy storage mode, controlling the third control valve to operate at an opening greater than a preset opening.

[0116] The preset opening degree may be 70% of the maximum opening degree of the second control valve.

[0117] In this embodiment, the third control valve is controlled to operate at a maximum opening. In other embodiments, the third control valve may also operate at an opening smaller than the maximum opening but larger than a preset opening.

[0118] The operating opening of the third control valve can be a preset fixed opening, or an opening determined according to the actual operation of the heat pump system. For example, in the preset mode, the energy demand value of the indoor unit can be obtained, and the opening of the third control valve required to be opened can be determined according to the energy demand value, so as to store energy while ensuring indoor comfort. For another example, in the preset energy storage mode, the exhaust pressure and / or exhaust superheat can be obtained, and the opening of the third control valve required to be opened here can be determined according to the exhaust pressure and / or exhaust superheat and / or the target opening of the first control valve operation, so as to further improve the reliability of the heat pump system.

[0119] In this embodiment, the third control valve operates at an opening greater than the preset opening in the preset mode, which is conducive to ensuring that the energy storage device can store energy while refrigerating. The third control valve operates at an opening greater than the preset opening in the preset energy storage mode, which is conducive to improving energy storage efficiency.

[0120] Further, based on any of the above embodiments, another embodiment of the control method of the heat pump system of the present application is proposed. In this embodiment, referring to Fig.10 , after step S10, further comprising:

[0121] Step S20, obtaining the subcooling degree of the indoor heat exchanger;

[0122] The degree of supercooling is specifically the temperature difference between the saturation temperature corresponding to the condensing pressure of the indoor heat exchanger and the outlet temperature of the indoor heat exchanger. Based on this, the degree of supercooling here can be calculated by detecting the condensing pressure of the indoor heat exchanger and the outlet temperature of the indoor heat exchanger.

[0123] Step S30, when the degree of supercooling is greater than a preset degree of supercooling, controlling the first control valve to increase its opening;

[0124] Step S40: When the degree of supercooling is less than the preset degree of supercooling, controlling the first control valve to reduce its opening degree.

[0125] Reducing or increasing the opening of the first control valve may be achieved by adjusting the current opening of the first control valve according to a preset fixed adjustment value; or the current opening of the first control valve may be adjusted according to an opening adjustment value determined according to the actual operation of the heat pump system. For example, the opening adjustment value may be determined based on the temperature difference between the temperature of the energy storage device and the target energy storage temperature, and so on.

[0126] In this embodiment, the supercooling degree of the indoor heat exchanger can accurately reflect whether the amount of refrigerant currently stored in the indoor heat exchanger is appropriate. When the supercooling degree is greater than the preset supercooling degree, it indicates that the amount of refrigerant stored in the indoor heat exchanger is too large. At this time, the first control valve is controlled to increase the opening degree, thereby increasing the amount of refrigerant participating in the circulation in the heat pump system, and effectively improving the energy storage efficiency of the energy storage device; when the supercooling degree is less than the preset supercooling degree, it indicates that the amount of refrigerant stored in the indoor heat exchanger is insufficient, and there is a risk of insufficient operating reliability of the system. At this time, the first control valve is controlled to reduce the opening degree, further reducing the amount of refrigerant participating in the circulation of the heat pump system, thereby further improving the system operation reliability.

[0127] In addition, an embodiment of the present invention further proposes a storage medium, on which a control program of a heat pump system is stored. When the control program of the heat pump system is executed by a processor, the relevant steps of any embodiment of the control method of the heat pump system are implemented.

[0128] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or system. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or system including the element.

[0129] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0130] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, including a number of instructions for a terminal device (which can be a mobile phone, computer, server, heat pump system, or network device, etc.) to execute the methods described in each embodiment of the present invention.

[0131] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A control method for a heat pump system, characterized in that: The heat pump system includes a compressor, an indoor heat exchanger, a first control valve, a throttling device, an outdoor heat exchanger and a refrigerant branch, wherein the indoor heat exchanger, the first control valve, the throttling device and the outdoor heat exchanger are connected, the refrigerant branch includes an energy storage device, the first end of the refrigerant branch is connected to the exhaust port of the compressor, or the first end of the refrigerant branch is connected to the exhaust port of the compressor through a reversing component, the pipeline between the first control valve and the throttling device is connected to the second end of the refrigerant branch, and the control method of the heat pump system includes the following steps: When the heat pump system operates in a preset energy storage mode in the first state, the first control valve is controlled to operate at a target opening so that the refrigerant is stored in the indoor heat exchanger; Wherein, in the first state, the return air port of the compressor is connected to the outdoor heat exchanger, and the exhaust air port of the compressor is connected to the indoor heat exchanger.

2. The control method of the heat pump system according to claim 1, characterized in that: The heat pump system further includes a reversing assembly, the indoor heat exchanger, the return air port of the compressor, the exhaust port of the compressor, and the outdoor heat exchanger are all connected to the reversing assembly, and when the heat pump system operates in a preset energy storage mode in the first state, before the step of controlling the first control valve to operate at a target opening so that the refrigerant is stored in the indoor heat exchanger, it also includes: When the heat pump system is in a preset mode and the indoor unit where the indoor heat exchanger is located meets the shutdown condition, the indoor fan corresponding to the indoor heat exchanger is controlled to be turned off, the reversing component is controlled to switch the operating state so that the heat pump system enters the first state, and the heat pump system is controlled to start the preset energy storage mode; Wherein, in the preset mode, the indoor heat exchanger is in an evaporating state.

3. The control method of the heat pump system according to claim 2, characterized in that: The reversing assembly includes a first four-way valve and a second four-way valve, the exhaust port, the return port, the indoor heat exchanger, and the first blocking member are respectively connected to different valve ports of the first four-way valve, the pipeline between the return port and the first four-way valve, the exhaust port, the outdoor heat exchanger, and the second blocking member are respectively connected to different valve ports of the second four-way valve, and the step of controlling the reversing assembly to switch the operating state so that the heat pump system enters the first state includes: Controlling the first four-way valve to switch to the second valve position for operation, and controlling the second four-way valve to switch to the third valve position for operation; In the second valve position, the exhaust port is connected to the indoor heat exchanger, and the return air port is connected to the first blocking member. In the third valve position, the return air port is connected to the outdoor heat exchanger, and the exhaust port is connected to the second blocking member.

4. The control method of the heat pump system according to claim 2, characterized in that: The control method of the heat pump system further includes: In the preset mode, the first four-way valve is controlled to operate at a first valve position, the second four-way valve is controlled to operate at a fourth valve position, and the first control valve is controlled to operate at a throttling opening; In the first valve position, the exhaust port is connected to the first blocking member, and the return air port is connected to the indoor heat exchanger. In the fourth valve position, the second blocking member is connected to the return air port, and the exhaust port is connected to the outdoor heat exchanger.

5. The control method of the heat pump system according to claim 4, characterized in that: The heat pump system further includes a heat dissipation module disposed between the first control valve and the throttling device, the heat dissipation module is used to dissipate heat from the heat generating component, the throttling device includes a second control valve, and a pipeline between the heat dissipation module and the first control valve is connected to the second end of the refrigerant branch. The control method of the heat pump system further includes: In the preset mode, the second control valve is controlled to operate at an opening greater than a preset opening.

6. The control method of the heat pump system according to claim 4, characterized in that: The control method of the heat pump system further includes: In the preset mode, when the cooling demand of the indoor heat exchanger is greater than or equal to the energy storage demand of the energy storage device, the steps of controlling the first four-way valve to operate at the first valve position, controlling the second four-way valve to operate at the fourth valve position, and controlling the first control valve to operate at a throttling opening are executed.

7. The control method of the heat pump system according to claim 2, characterized in that: The throttling device includes a second control valve, and the control method of the heat pump system further includes: In the preset mode, the first four-way valve is controlled to operate at a first valve position, the second four-way valve is controlled to operate at a third valve position, and both the first control valve and the second control valve are controlled to operate at a throttling opening; In the first valve position, the exhaust port is connected to the first blocking member, and the return air port is connected to the indoor heat exchanger. In the third valve position, the return air port is connected to the outdoor heat exchanger, and the exhaust port is connected to the second blocking member.

8. The control method of the heat pump system according to claim 7, characterized in that: The control method of the heat pump system further includes: In the preset mode, when the cooling demand of the indoor heat exchanger is less than the energy storage demand of the energy storage device, the steps of controlling the first four-way valve to operate at the first valve position, controlling the second four-way valve to operate at the third valve position, and controlling both the first control valve and the second control valve to operate at a throttling opening are executed.

9. The control method of a heat pump system according to any one of claims 2 to 8, characterized in that: The refrigerant branch further includes a third control valve, and the control method of the heat pump system further includes: In the preset mode or the preset energy storage mode, the third control valve is controlled to operate with an opening greater than a preset opening.

10. The control method of a heat pump system according to any one of claims 1 to 8, characterized in that: After the step of controlling the first control valve to operate at a target opening so that the refrigerant is stored in the indoor heat exchanger, the method further includes: Obtaining a subcooling degree of the indoor heat exchanger; When the degree of subcooling is greater than a preset degree of subcooling, controlling the first control valve to increase its opening; When the degree of subcooling is less than the preset degree of subcooling, the first control valve is controlled to reduce its opening degree.

11. A heat pump system, characterized in that: The heat pump system includes a control device, a compressor, an indoor heat exchanger, a first control valve, a throttling device, an outdoor heat exchanger and a refrigerant branch, wherein the indoor heat exchanger, the first control valve, the throttling device and the outdoor heat exchanger are connected, the refrigerant branch includes an energy storage device, the first end of the refrigerant branch is connected to the exhaust port of the compressor, or the first end of the refrigerant branch is connected to the exhaust port of the compressor through a reversing component, and the pipeline between the first control valve and the throttling device is connected to the second end of the refrigerant branch; The first control valve is connected to the control device, which includes: a memory, a processor, and a control program of the heat pump system stored in the memory and executable on the processor, wherein the control program of the heat pump system implements the steps of the control method of the heat pump system as described in any one of claims 1 to 10 when executed by the processor.

12. A storage medium, characterized in that: The storage medium stores a control program of the heat pump system, and when the control program of the heat pump system is executed by the processor, the steps of the control method of the heat pump system according to any one of claims 1 to 10 are implemented.

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