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 refrigerant main path and a refrigerant branch path, the refrigerant branch path comprises an energy storage device, the first end of the refrigerant branch path communicates with an exhaust port of a compressor, and a pipeline between an indoor unit and an outdoor heat exchanger is connected with the second end of the refrigerant branch path. The outdoor heat exchanger is communicated with an air return port of the compressor; when the operation of the heat pump system reaches a preset condition, the reversing assembly is controlled to operate in a second state, so that the indoor unit communicates with the exhaust port of the compressor; wherein the preset condition indicates that the indoor unit has a frosting risk when the heat pump system operates in the defrosting mode. The defrosting effect of the outdoor heat exchanger is improved while the frosting risk of the indoor heat exchanger is reduced.

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] In addition to the indoor unit providing the required energy for indoor regulation, the heat pump system also has an energy storage device to store energy to meet other regulation needs. The energy storage device can be connected to the exhaust side of the compressor to store the heat of the high-temperature refrigerant discharged by the compressor in the energy storage device. When the energy storage device is in the energy storage state, the outdoor heat exchanger in the heat pump system generally needs to act as an evaporator to absorb heat from the environment. When the heat pump system is running in a low-temperature environment, the outdoor heat exchanger is prone to frost, affecting the normal operation of the system.

[0003] When the heat pump system starts the defrost mode under the energy storage device, the outdoor heat exchanger is generally switched to the condensation state to release heat to melt the frost, while the indoor heat exchanger needs to be switched to the evaporation state to absorb ambient heat for defrosting. However, the energy storage device cannot be switched to a low-pressure state, and the heat required for defrosting can only be obtained through the evaporation heat absorption of the indoor heat exchanger. Especially when the system frequently runs the defrost mode, it is easy to cause the indoor heat exchanger coil temperature to be too low and frost to form, which not only affects the normal operation of the system, but also causes poor defrosting effect of the outdoor heat exchanger. Summary of the invention

[0004] 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 reduce the risk of frost formation in an indoor heat exchanger while improving the defrosting effect of an outdoor heat exchanger.

[0005] To achieve the above-mentioned purpose, the present invention provides a control method for a heat pump system, wherein the heat pump system comprises a refrigerant main circuit and a refrigerant branch circuit, wherein the refrigerant main circuit comprises an indoor unit, an outdoor heat exchanger, a reversing assembly and a compressor, wherein the indoor unit, the outdoor heat exchanger, the exhaust port of the compressor and the return air port of the compressor are all connected to the reversing assembly, and the refrigerant branch circuit comprises an energy storage device, wherein a first end of the refrigerant branch circuit is connected to the exhaust port of the compressor, or a first end of the refrigerant branch circuit is connected to the exhaust port or the return air port of the compressor through a reversing assembly, and a pipeline between the indoor unit and the outdoor heat exchanger is connected to a second end of the refrigerant branch circuit, and the control method for the heat pump system comprises the following steps:

[0006] Controlling the reversing assembly to operate in a first state so that the outdoor heat exchanger is in communication with the return air port of the compressor;

[0007] When the operation of the heat pump system reaches a preset condition, controlling the reversing component to operate in a second state so that the indoor unit is connected to the exhaust port of the compressor;

[0008] The preset condition indicates that there is a risk of frost on the indoor unit when the heat pump system operates in a defrost mode.

[0009] Optionally, when the operation of the heat pump system reaches a preset condition, before the step of controlling the reversing component to operate in the second state, the step further includes:

[0010] Acquire the indoor ambient temperature corresponding to the heat pump system and / or the defrosting time of the heat pump system when the defrosting mode was last run and / or the characteristic temperature of the indoor heat exchanger in the indoor unit;

[0011] Determine a target duration according to the indoor ambient temperature and / or the defrosting duration and / or the characteristic temperature;

[0012] When the operation of the heat pump system reaches a preset condition, the step of controlling the reversing component to operate in the second state comprises:

[0013] When the operation of the heat pump system reaches a preset condition, the reversing component is controlled to operate in the second state for the target time period.

[0014] Optionally, the step of determining the target duration according to the indoor ambient temperature and / or the defrosting duration and / or the characteristic temperature includes:

[0015] Determine a reference duration according to the indoor ambient temperature, determine a first correction duration according to the defrosting duration, and determine a second correction duration according to the characteristic temperature;

[0016] The reference duration is corrected according to the first corrected duration and the second corrected duration to obtain the target duration.

[0017] Optionally, the indoor ambient temperature is negatively correlated with the reference time, the defrosting time is positively correlated with the first correction time, and the second correction time is negatively correlated with the characteristic temperature.

[0018] Optionally, the number of the indoor units is more than one, and the step of obtaining the indoor ambient temperature corresponding to the heat pump system includes:

[0019] Acquiring a first temperature of an indoor environment adjusted by the indoor unit;

[0020] The indoor ambient temperature is determined based on more than one of the first temperatures.

[0021] Optionally, the number of the indoor units is more than one, and the step of obtaining the characteristic temperature of the indoor heat exchanger in the indoor unit includes:

[0022] Obtaining the inlet temperature and outlet temperature of the indoor heat exchanger in the indoor unit;

[0023] Determine a second temperature of the corresponding indoor heat exchanger according to the inlet temperature and the outlet temperature;

[0024] Determining more than one of the second temperatures determines the characteristic temperature.

[0025] Optionally, the preset condition includes at least one of the following conditions:

[0026] The indoor ambient temperature corresponding to the heat pump system is lower than the first preset ambient temperature;

[0027] The defrost time of the heat pump system when it last ran the defrost mode is longer than the preset time;

[0028] The characteristic temperature of the indoor heat exchanger in the indoor unit is less than a preset temperature;

[0029] The outdoor ambient temperature corresponding to the heat pump system is less than or equal to a second preset ambient temperature.

[0030] Optionally, the indoor unit includes an indoor heat exchanger and a first control valve connected in series with the indoor heat exchanger, and the control method of the heat pump system further includes:

[0031] Controlling the reversing assembly to operate in the first state so that both the outdoor heat exchanger and the indoor unit are connected to the return air port of the compressor, and controlling the first control valve to operate at an opening less than a preset opening;

[0032] When the operation of the heat pump system reaches the preset condition, the reversing assembly is controlled to operate in the second state to connect the indoor unit with the exhaust port of the compressor, and the first control valve is controlled to operate at an opening greater than or equal to the preset opening.

[0033] Optionally, the control method of the heat pump system further includes:

[0034] When the operation of the heat pump system reaches the start-up condition of the defrost mode, the reversing assembly is controlled to operate in a third state so that the outdoor heat exchanger is connected to the exhaust port of the compressor, and the indoor unit is connected to the return air port of the compressor;

[0035] When the heat pump system reaches the exit condition of the defrost mode, the step of controlling the reversing component to operate in a first state is performed so that both the outdoor heat exchanger and the indoor unit are connected to the return air port of the compressor.

[0036] Optionally, the reversing assembly includes a first reversing valve and a second reversing valve, the indoor unit, the return air port, and the exhaust port are respectively connected to different valve ports of the first reversing valve, the outdoor heat exchanger, the return air port, and the exhaust port are respectively connected to different valve ports of the second reversing valve, and the step of controlling the reversing assembly to operate in a first state so that both the outdoor heat exchanger and the indoor unit are connected to the return air port of the compressor includes:

[0037] Controlling the first reversing valve to operate at a second valve position so that the return air port is connected to the indoor unit and the exhaust port is blocked from the indoor unit, and controlling the second reversing valve to operate at a fourth valve position so that the return air port is connected to the outdoor heat exchanger and the exhaust port is blocked from the outdoor heat exchanger;

[0038] The step of controlling the reversing assembly to operate in the second state so that the indoor unit is connected to the exhaust port of the compressor comprises:

[0039] The first reversing valve is controlled to switch to the first valve position so that the exhaust port is connected to the indoor unit and the return air port is blocked from the indoor unit, and the second reversing valve is controlled to maintain the fourth valve position.

[0040] In addition, in order to achieve the above-mentioned purpose, the present application also proposes a heat pump system, the heat pump system includes a control device, a refrigerant main circuit and a refrigerant branch circuit, the refrigerant main circuit includes an indoor unit, an outdoor heat exchanger, a reversing component and a compressor, the indoor unit, the outdoor heat exchanger, the exhaust port of the compressor and the return air port of the compressor are all connected to the reversing component, the refrigerant branch circuit includes an energy storage device, the first end of the refrigerant branch circuit is connected to the exhaust port of the compressor, and the pipeline between the indoor unit and the outdoor heat exchanger is connected to the second end of the refrigerant branch circuit;

[0041] The reversing component 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. When the control program for the heat pump system is executed by the processor, the steps of the control method for the heat pump system as described in any one of the above items are implemented.

[0042] 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.

[0043] The present invention proposes a control method for a heat pump system. In addition to a refrigerant main circuit, the heat pump system is also provided with a refrigerant branch circuit including an energy storage device. One end of the refrigerant branch circuit is connected to the exhaust port of the compressor in the refrigerant main circuit, and the other end of the refrigerant branch circuit is connected to the pipeline between the indoor and outdoor units in the refrigerant main circuit. Based on this, when the reversing component operates in a first state, the outdoor heat exchanger and the indoor unit are both on the low-pressure side, and the energy storage device is on the high-pressure side. The indoor and outdoor heat exchangers can absorb heat from the environment and store it in the energy storage device. In this process, when it is identified that there is a risk of frost in the indoor unit when the heat pump system is in defrosting operation, the reversing component switches to a second state to switch the indoor heat exchanger from the low-pressure side to the high-pressure side, and the high-temperature refrigerant discharged by the compressor can flow into the indoor heat exchanger to heat the indoor heat exchanger, thereby ensuring that the temperature of the indoor heat exchanger will not be too low to frost when the heat pump system subsequently operates in the defrost mode, and heat can also be provided for defrosting the outdoor heat exchanger, thereby reducing the risk of frost in the indoor heat exchanger and improving the defrosting effect of the outdoor heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a structural schematic diagram of an embodiment of a heat pump system of the present invention;

[0045] Figure 2 A schematic diagram of the hardware structure involved in the operation of an embodiment of a heat pump system of the present invention;

[0046] Figure 3 A schematic flow chart of an embodiment of a control method for a heat pump system of the present invention;

[0047] Figure 4 A schematic flow chart of another embodiment of a control method for a heat pump system of the present invention;

[0048] Figure 5 The figure is a flow chart of another optional embodiment of the control method of the heat pump system of the present invention.

[0049] 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

[0050] 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.

[0051] An embodiment of the present invention provides a heat pump system.

[0052] In the embodiment of the present invention, refer to Figures 1 to 3 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, and the refrigerant branch circuit includes an energy storage device 6.

[0053] In this embodiment, the refrigerant main circuit includes a compressor 1, an indoor unit, a throttling device 3, an outdoor heat exchanger 4, and a reversing assembly 5. The indoor unit, the throttling device 3, and the outdoor heat exchanger 4 are connected in sequence, and the exhaust port of the compressor 1, the return air port of the compressor 1, the indoor unit, and the outdoor heat exchanger 4 are all connected to the reversing assembly 5. The compressor 1, the throttling device 3, and the indoor unit are all connected to the control device 100.

[0054] The indoor unit includes an indoor heat exchanger 21 and a first control valve 22 connected in series with the indoor heat exchanger 21. The indoor unit also includes an indoor fan 23 corresponding to the indoor heat exchanger 21, and the indoor fan 23 is used to drive indoor air to exchange heat with the indoor heat exchanger 21. The first control valve 22 and the indoor fan 23 are both connected to the control device 100.

[0055] In this embodiment, the number of the indoor unit is more than one, for example, 2, 3 or 4, etc. In other embodiments, the number of the indoor unit may also be one.

[0056] The reversing assembly 5 is used to switch the flow direction of the refrigerant between the indoor unit and the outdoor heat exchanger 4 .

[0057] In this embodiment, if Figure 1 As shown, the reversing assembly 5 includes a first reversing valve 51 and a second reversing valve 52. The first reversing valve 51 includes a first three-way valve or a first four-way valve, and the second reversing valve 52 includes a second three-way valve or a second four-way valve. The indoor heat exchanger 21, the exhaust port, and the return port are respectively connected to different valve ports of the first reversing valve 51, and the outdoor heat exchanger 4, the exhaust port, and the return port are respectively connected to different valve ports of the second reversing valve 52.

[0058] The first reversing valve 51 has a first valve position and a second valve position. When the first reversing valve 51 is in the first valve position, the exhaust port of the compressor 1 is connected to the indoor unit, and the return air port of the compressor 1 is blocked from the indoor unit; when the first reversing valve 51 is in the second valve position, the exhaust port of the compressor 1 is blocked from the indoor unit, and the return air port of the compressor 1 is connected to the indoor unit.

[0059] The second reversing valve 52 has a third valve position and a fourth valve position. When the second reversing valve 52 is in the third valve position, the exhaust port of the compressor 1 is connected to the outdoor heat exchanger 4, and the return air port of the compressor 1 is blocked from the outdoor heat exchanger 4; when the second reversing valve 52 is in the fourth valve position, the exhaust port of the compressor 1 is blocked from the outdoor heat exchanger 4, and the return air port of the compressor 1 is connected to the outdoor heat exchanger 4. In this embodiment, the energy storage device 6 includes a water tank or a water heater. In other embodiments, the energy storage device 6 may also be a device storing other energy storage media.

[0060] The first end of the refrigerant branch is connected to the exhaust port of the compressor 1, and the pipeline between the indoor unit and the outdoor heat exchanger 4 is connected to the second end of the refrigerant branch. In this embodiment, the pipeline between the throttling device 3 and the first control valve 22 is connected to the second end of the refrigerant branch.

[0061] The refrigerant branch also includes a second control valve 7 connected in series with the energy storage device 6. The second control valve 7 is connected to the control device 100. The second control valve 7 can be used to control the flow of the refrigerant branch. The second control valve 7 is connected to the control device 100. When the second control valve 7 is opened, the energy storage device 6 is in an energy storage state; when the second control valve 7 is closed, the energy storage device 6 is in a stopped energy storage state.

[0062] In one implementation of this embodiment, the reversing assembly also includes a switching valve (not shown in the figure), which can be a four-way valve or a three-way valve. The switching valve has a first state and a second state. When the switching valve is in the first state, the return air port of the compressor 1 is connected to the energy storage device 6; when the switching valve is in the second state, the exhaust port of the compressor 1 is connected to the energy storage device 6.

[0063] Based on the above structure, the heat pump system can achieve at least the following operating states through the state switching of the reversing component 5:

[0064] When the reversing assembly 5 operates in the first state, the first reversing valve 51 operates in the second valve position, the second reversing valve 52 operates in the fourth valve position, the exhaust port of the compressor 1 is connected to the energy storage device 6 (if the reversing assembly includes the above-mentioned switching valve, the switching valve is in the second state), the outdoor heat exchanger 4 and the indoor unit are both connected to the return air port of the compressor 1, and when the second control valve 7 is opened or the second control valve 7 is not provided, the refrigerant discharged from the compressor 1 all flows into the refrigerant branch, and the heat in the refrigerant is stored in the energy storage device 6 when flowing through the energy storage device 6. The refrigerant flowing out of the refrigerant branch can flow into the outdoor heat exchanger 4 for heat exchange and then flow back to the compressor 1. Among them, when the first control valve 22 is opened, the refrigerant flowing out of the refrigerant branch can partially flow into the indoor heat exchanger 4 for heat exchange and then flow back to the compressor 1; when the first control valve 22 is closed, the refrigerant flowing out of the refrigerant branch stops flowing into the indoor heat exchanger 21. In the first state, the outdoor heat exchanger 4 is in an evaporating state, and the indoor heat exchanger 21 is in a heat exchange stop state or an evaporating state. At this time, the heat pump system is in a single energy storage state.

[0065] When the reversing assembly 5 operates in the second state, the first reversing valve 51 operates in the first valve position, the second reversing valve 52 operates in the fourth valve position, the exhaust port of the compressor 1 is connected to the energy storage device 6 (if the reversing assembly includes the above-mentioned switching valve, the switching valve is in the second state), the outdoor heat exchanger 4 is connected to the return air port of the compressor 1, and the indoor unit is connected to the exhaust port of the compressor 1. When the second control valve 7 is opened, part of the refrigerant discharged from the compressor 1 flows into the refrigerant branch, and the heat in the refrigerant is stored in the energy storage device 6 when flowing through the energy storage device 6. The refrigerant flowing out of the refrigerant branch can flow into the outdoor heat exchanger 4 for heat exchange and then flow back to the compressor 1; another part of the refrigerant discharged from the compressor 1 flows into the indoor unit to increase the temperature of the indoor unit. When the first control valve 22 is opened, the refrigerant flowing out of the indoor heat exchanger 4 flows through the throttling device 3 and the outdoor heat exchanger 4 in sequence and then flows back to the compressor 1; in addition, when the second control valve 7 is closed, the refrigerant discharged from the compressor 1 stops flowing into the refrigerant branch, but flows through the indoor unit, the throttling device 3, and the outdoor heat exchanger 4 in sequence and then flows back to the compressor. In the second state, the outdoor heat exchanger 4 is in an evaporating state, and the indoor heat exchanger 21 is in a condensing state. When the second control valve 7 is opened, the heat pump system is in an energy storage state and heats the indoor heat exchanger at the same time. When the second control valve 7 is closed, the heat pump system stops storing energy and the indoor heat exchanger heats.

[0066] When the reversing assembly 5 operates in the third state, the first reversing valve 51 operates in the second valve position, the second reversing valve 52 operates in the fourth valve position, the exhaust port of the compressor 1 is connected to the energy storage device 6 (if the reversing assembly includes the above-mentioned switching valve, the switching valve is in the second state), the outdoor heat exchanger 4 is connected to the exhaust port of the compressor 1, and the indoor unit is connected to the return air port of the compressor 1. A part of the refrigerant discharged from the compressor 1 flows into the refrigerant branch, and the heat in the refrigerant is stored in the energy storage device 6 when flowing through the energy storage device 6. The refrigerant flowing out of the refrigerant branch flows through the indoor unit for heat exchange and then flows back to the compressor 1; another part of the refrigerant discharged from the compressor 1 flows into the outdoor heat exchanger 4 to release heat, and the refrigerant flowing out of the outdoor heat exchanger 4 flows through the throttling device 3 and the indoor unit in turn for heat exchange and then flows back to the compressor 1. In the third state, the outdoor heat exchanger 4 is in a condensing state, and the indoor heat exchanger 21 is in an evaporating state. At this time, the heat pump system can use the heat of the refrigerant flowing through the outdoor heat exchanger 4 to melt the frost in the outdoor unit, or the heat pump system can cool the indoor environment.

[0067] Further, in this embodiment, referring to Figures 1 to 3The heat pump system further includes a temperature detection module 01, which is connected to the control device 100. The temperature detection module 01 is provided at the indoor heat exchanger 21 to detect the characteristic temperature of the indoor heat exchanger. In this embodiment, the temperature detection module 01 includes a first temperature sensor provided at the inlet of the indoor heat exchanger 21 and / or a second temperature sensor provided at the outlet of the indoor heat exchanger 21. In other embodiments, the temperature detection module 01 may also include a third temperature sensor provided at the middle of the indoor heat exchanger coil.

[0068] Further, in this embodiment, referring to Figures 1 to 3 The heat pump system further includes an environment detection module 02, which is connected to the control device 100. The environment detection module 02 can be arranged in the environment where the heat pump system is located, so as to detect the ambient temperature corresponding to the heat pump system. In this embodiment, the environment detection module 02 includes an indoor temperature sensor arranged in the indoor space regulated by the indoor unit and / or an outdoor temperature sensor arranged in the outdoor environment where the heat pump system is located.

[0069] In the embodiment of the present invention, refer to Figure 2 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.

[0070] Those skilled in the art will understand that Figure 2 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.

[0071] like Figure 2 As shown, the memory 1002 as a computer storage medium may include a control program for the heat pump system.

[0072] exist Figure 2 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.

[0073] 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.

[0074] Reference Figure 3 , 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:

[0075] Step S10, controlling the reversing assembly to operate in a first state so that the outdoor heat exchanger is connected to the return air port of the compressor; at this time, the indoor unit can be connected to the return air port of the compressor.

[0076] Among them, step S10 can be executed when the first instruction from the user to start the separate energy storage mode is received; step S10 can also be executed when the indoor unit of the heat pump system reaches the temperature and shuts down in the heating state or the cooling state; the defrost mode can also be run during the operation of the heat pump system in the separate energy storage mode and step S10 can be executed after the defrost mode is exited, and so on.

[0077] In an implementation of this embodiment, the reversing assembly includes the first reversing valve and the second reversing valve. The first reversing valve is controlled to operate at the second valve position so that the return air port is connected to the indoor unit and the exhaust port is blocked from the indoor unit, and the second reversing valve is controlled to operate at the fourth valve position so that the return air port is connected to the outdoor heat exchanger and the exhaust port is blocked from the outdoor heat exchanger.

[0078] In the process of controlling the reversing component to operate in the first state, the first reversing valve can be controlled to operate in the second valve position, and the second reversing valve can be controlled to operate in the fourth valve position. At this time, the outdoor heat exchanger and the indoor unit are both connected to the return air port of the compressor. When the second control valve is opened or the second control valve is not provided, the refrigerant discharged by the compressor flows into the refrigerant branch in full, and the heat in the refrigerant is stored in the energy storage device when flowing through the energy storage device. The refrigerant flowing out of the refrigerant branch can flow into the outdoor heat exchanger for heat exchange in full or in part and then flow back to the compressor. Among them, when the first control valve is opened, the refrigerant flowing out of the refrigerant branch can flow into the indoor heat exchanger for heat exchange in part and then flow back to the compressor; when the first control valve is closed, the refrigerant flowing out of the refrigerant branch stops flowing into the indoor heat exchanger 21. In the first state, the outdoor heat exchanger 4 is in an evaporation state, and the indoor heat exchanger 21 is in a stop heat exchange state or an evaporation state. At this time, the heat pump system is in a single energy storage state.

[0079] In another implementation of this embodiment, the reversing component can also be a single refrigerant regulating component with a multi-flow path switching function, and the reversing component can be controlled to operate in the first operating position so that the return air port is connected to the indoor unit, and the exhaust port is blocked from the indoor unit, and the return air port is connected to the outdoor heat exchanger, and the exhaust port is blocked from the outdoor heat exchanger.

[0080] Step S20, when the operation of the heat pump system reaches a preset condition, controlling the reversing component to operate in a second state so that the indoor unit is connected to the exhaust port of the compressor;

[0081] The preset condition indicates that there is a risk of frost on the indoor unit when the heat pump system operates in a defrost mode.

[0082] In this embodiment, in the defrost mode, the indoor heat exchanger is in an evaporation state, and the outdoor heat exchanger is in a condensation state. At this time, the energy storage device is in an energy storage state or a non-energy storage state.

[0083] The frost risk here may be the frost risk caused by the heat pump system running in the defrost mode before the current moment, or may be the frost risk that may exist when the heat pump system runs in the defrost mode after the current moment.

[0084] The preset conditions include operating parameters of the heat pump system itself and / or environmental parameters of the environment where the heat pump system is located, which need to be met when there is a risk of frost formation caused by the indoor unit operating in the defrost mode.

[0085] In one implementation of this embodiment, the reversing assembly includes the above-mentioned first reversing valve and second reversing valve, and the first reversing valve is controlled to switch to the first valve position so that the exhaust port is connected to the indoor unit and the return air port is blocked from the indoor unit, and the second reversing valve is controlled to maintain the fourth valve position.

[0086] The control reversing assembly operates in the second state, specifically, the first reversing valve can be controlled to operate in the first valve position, and the second reversing valve can be controlled to operate in the fourth valve position. At this time, the outdoor heat exchanger is connected to the return air port of the compressor, and the indoor unit is connected to the exhaust port of the compressor. When the second control valve is opened or the second control valve is not provided, a part of the refrigerant discharged from the compressor flows into the refrigerant branch, and the heat in the refrigerant is stored in the energy storage device when flowing through the energy storage device. The refrigerant flowing out of the refrigerant branch can flow into the outdoor heat exchanger for heat exchange and then flow back to the compressor; another part of the refrigerant discharged from the compressor flows into the indoor unit to increase the temperature of the indoor unit, and the refrigerant flowing out of the indoor unit flows through the throttling device and the outdoor heat exchanger in turn and then flows back to the compressor; in addition, when the second control valve is closed, the refrigerant discharged from the compressor stops flowing into the refrigerant branch, but flows through the indoor unit, the throttling device, and the outdoor heat exchanger in turn and then flows back to the compressor. In the second state, the outdoor heat exchanger is in an evaporating state, and the indoor heat exchanger is in a condensing state. The temperature of the indoor heat exchanger rises. Based on this, even if the subsequent heat pump system enters the defrost mode, the indoor heat exchanger can absorb the heat of the coil in the evaporating state to avoid freezing due to low temperature.

[0087] In another implementation of this embodiment, the reversing component can also be a single refrigerant regulating component with a multi-flow switching function, and the reversing component can be controlled to operate in a second operating position so that the exhaust port is connected to the indoor unit, and the return air port is blocked from the indoor unit, and the return air port is connected to the outdoor heat exchanger, and the exhaust port is blocked from the outdoor heat exchanger.

[0088] A control method for a heat pump system is proposed in an embodiment of the present invention. In addition to a refrigerant main circuit, the heat pump system is also provided with a refrigerant branch circuit including an energy storage device. One end of the refrigerant branch circuit is connected to the exhaust port of the compressor in the refrigerant main circuit, and the other end of the refrigerant branch circuit is connected to the pipeline between the indoor and outdoor units in the refrigerant main circuit. Based on this, when the reversing component operates in a first state, the outdoor heat exchanger and the indoor unit are both on the low-pressure side, and the energy storage device is on the high-pressure side. The indoor and outdoor heat exchangers can absorb heat from the environment and store it in the energy storage device. In this process, when it is identified that there is a risk of frost in the indoor unit when the heat pump system is in defrosting operation, the reversing component switches to a second state to switch the indoor heat exchanger from the low-pressure side to the high-pressure side, and the high-temperature refrigerant discharged by the compressor can flow into the indoor heat exchanger to heat the indoor heat exchanger, thereby ensuring that the temperature of the indoor heat exchanger will not be too low to frost when the heat pump system subsequently operates in the defrosting mode, and heat can also be provided for defrosting the outdoor heat exchanger, thereby reducing the risk of frost on the indoor heat exchanger and improving the defrosting effect of the outdoor heat exchanger.

[0089] 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, referring to Figure 4 , before step S20, further comprising:

[0090] Step S201, obtaining the indoor ambient temperature corresponding to the heat pump system and / or the defrosting time of the heat pump system when the defrosting mode was last run and / or the characteristic temperature of the indoor heat exchanger in the indoor unit;

[0091] The indoor ambient temperature may be a temperature detected by a temperature sensor in the indoor space regulated by the indoor unit, or may be a temperature determined based on temperature data detected by a temperature sensor in the indoor space regulated by the indoor unit.

[0092] When there are more than one indoor units, the indoor ambient temperature here can be determined according to the indoor temperatures corresponding to the more than one indoor units, or the indoor temperature corresponding to the indoor units that meet the set conditions can be determined as the indoor ambient temperature here.

[0093] If the heat pump system has not been in defrost mode before the current moment, the defrost duration here is 0. If the heat pump system has been in defrost mode before the current moment, the defrost duration here is the operation duration of the defrost mode closest to the current moment.

[0094] The characteristic temperature of the indoor heat exchanger can be directly detected by a temperature sensor on the indoor heat exchanger; it can also be determined based on temperature data detected by the temperature sensor on the indoor heat exchanger.

[0095] When there are more than one indoor units, the characteristic temperature here can be determined according to the indoor heat exchanger temperatures corresponding to more than one indoor units, or the indoor heat exchanger temperature corresponding to the indoor unit when the set conditions are met can be determined as the characteristic temperature here.

[0096] After step S10, when the time for which the reversing component operates in the first state reaches a set time, step S201 is executed.

[0097] Step S202, determining a target duration according to the indoor ambient temperature and / or the defrosting duration and / or the characteristic temperature;

[0098] The target duration is specifically the target value of the duration for which the heat pump system operates in the second state when the operation meets the above preset conditions.

[0099] In this embodiment, the target duration is determined according to the indoor ambient temperature, the defrosting time and the characteristic temperature. In other embodiments, the target duration may also be determined according to one or two of the indoor ambient temperature, the defrosting time and the characteristic temperature.

[0100] Different indoor ambient temperatures and / or different defrost times and / or different characteristic temperatures correspond to different target times. The pre-set mapping table can be queried by the indoor ambient temperature and / or defrost time and / or characteristic temperature, and the target time here can be determined according to the result of the table query. Alternatively, a relationship between the indoor ambient temperature and / or defrost time and / or characteristic temperature and the target time can be pre-set, and the indoor ambient temperature and / or defrost time and / or characteristic temperature can be substituted into the relationship to calculate the target time.

[0101] Step S20 includes:

[0102] Step S21, when the operation of the heat pump system reaches a preset condition, controlling the reversing component to operate in the second state for the target time period.

[0103] When the operating time of the reversing component in the second state reaches the target time, the process may return to step S10.

[0104] In this embodiment, the indoor ambient temperature and / or the defrost time and / or the characteristic temperature of the indoor heat exchanger can accurately reflect the frosting risk of the indoor heat exchanger during the defrosting operation of the heat pump system and whether the defrosting heat is sufficient. Based on this, the target preheating time of the indoor heat exchanger is determined according to the indoor ambient temperature and / or the defrost time and / or the characteristic temperature of the indoor heat exchanger, which is conducive to further reducing the frosting risk of the indoor heat exchanger and improving the defrosting effect during the defrosting operation.

[0105] In other embodiments, the switching component is also controlled to operate in the second state for a preset fixed time period.

[0106] Furthermore, in this embodiment, step S202 includes: determining a reference duration according to the indoor ambient temperature, determining a first correction duration according to the defrost duration, and determining a second correction duration according to the characteristic temperature; correcting the reference duration according to the first correction duration and the second correction duration to obtain the target duration.

[0107] Different indoor ambient temperatures correspond to different reference durations, different defrost durations correspond to different first correction durations, and different characteristic temperatures correspond to different second correction durations. In this embodiment, the indoor ambient temperature is negatively correlated with the reference duration, the defrost duration is positively correlated with the first correction duration, and the second correction duration is negatively correlated with the characteristic temperature. In other embodiments, the indoor ambient temperature may also be positively correlated with the reference duration, or the defrost duration is negatively correlated with the first correction duration, or the characteristic temperature is positively correlated with the second correction duration.

[0108] In this embodiment, the reference duration is determined according to the temperature interval in which the indoor ambient temperature is located, the first correction duration is determined according to the time interval in which the defrosting duration is located, and the second correction duration is determined according to the temperature interval in which the characteristic temperature is located. In other embodiments, the reference duration can be calculated by substituting the indoor ambient temperature into the first formula, or the first correction duration can be calculated by substituting the defrosting duration into the second formula, or the second correction duration can be calculated by substituting the characteristic temperature into the third formula.

[0109] In order to better understand the solution of this embodiment, Ti-env' is defined as the indoor ambient temperature, t_fro is the defrosting time, and Ti_pipe' is the characteristic temperature of the indoor heat exchanger. The determination process of the target time mentioned in this embodiment is explained below with a specific example:

[0110] 1) The corresponding relationship between indoor ambient temperature and reference duration is shown in Table 1 below:

[0111] Ti-env'(℃) Benchmark duration(s) Ti-env'≥20 0 15≤Ti-env'<20 10 10≤Ti-env'<15 20 5≤Ti-env'<10 30 0≤Ti-env'<5 40 Ti-env'<0 60

[0112] Table 1

[0113] 2) The relationship between the defrosting time and the first correction time is shown in Table 2 below:

[0114] t_fro(min) First revision duration(s) t_fro<4 0 4≤t_fro<6 20 6≤t_fro<8 40 8≤t_fro<10 50 t_fro ≥ 10 60

[0115] Table 2

[0116] 3) The relationship between the characteristic temperature of the indoor heat exchanger and the second correction time is shown in Table 3 below:

[0117] Ti_pipe'(℃) Second revision duration(s) Ti_pipe'≥20 0 10≤Ti_pipe'<20 20 0≤Ti_pipe'<10 40 Ti_pipe'<0 60

[0118] Table 3

[0119] Among them, target duration = reference duration + first revised duration + second revised duration.

[0120] Based on the above relationship, for example, when the indoor ambient temperature is 17°C, the defrost time is 9 minutes, and the characteristic temperature of the indoor heat exchanger is 5°C, the target time = 10s + 50s + 40s = 100s; for another example, when the indoor ambient temperature is -5°C, the defrost time is 20 minutes, and the characteristic temperature of the indoor heat exchanger is -10°C, the target time = 60s + 60s + 60s = 180s, and so on.

[0121] In this embodiment, the target time is determined in the above manner in combination with the indoor ambient temperature, the defrost time and the characteristic temperature of the indoor heat exchanger, which is conducive to ensuring that the target time can be accurately matched with the actual frost risk of the indoor heat exchanger, and that after the reversing component is controlled to operate in the second state according to the target time, the frost risk of the indoor heat exchanger is effectively reduced and the defrost effect of the outdoor heat exchanger during defrost operation can be effectively improved.

[0122] Furthermore, in this embodiment, the number of the indoor units is more than one, and the step of obtaining the indoor ambient temperature corresponding to the heat pump system includes: obtaining the first temperature of the indoor environment regulated by the indoor unit; and determining the indoor ambient temperature based on more than one first temperature.

[0123] The first temperature can be specifically detected by an environment detection module in the corresponding indoor environment.

[0124] In this embodiment, all indoor units are in the evaporation state in the defrost mode, and the first temperature of the indoor environment adjusted by each indoor unit can be obtained, and the indoor environment temperature is determined according to all the obtained first temperatures. In other embodiments, some indoor units are in the evaporation state in the defrost mode, and the first temperature corresponding to the indoor units in the evaporation state in the defrost mode can be obtained, and the indoor environment temperature is determined according to all the obtained first temperatures.

[0125] In this embodiment, the average of more than one first temperature is determined to be the indoor ambient temperature. In other embodiments, the minimum of more than one first temperature can also be determined to be the indoor ambient temperature.

[0126] In this embodiment, when the number of indoor units is more than one, the indoor ambient temperature used to determine the target time is determined based on the indoor temperatures corresponding to the more than one indoor units. This is beneficial to ensure that the determined indoor ambient temperature can accurately reflect the overall frost risk of more than one indoor units, and ensure that the reversing component can effectively reduce the frost risk of each indoor unit when operating in the second state.

[0127] Furthermore, in this embodiment, the number of the indoor units is more than one, and the step of obtaining the characteristic temperature of the indoor heat exchanger in the indoor unit includes: obtaining the inlet temperature and the outlet temperature of the indoor heat exchanger in the indoor unit; determining the corresponding second temperature of the indoor heat exchanger according to the inlet temperature and the outlet temperature; and determining more than one second temperature to determine the characteristic temperature.

[0128] The inlet temperature and the outlet temperature can be specifically detected by the temperature sensors on the corresponding indoor heat exchangers.

[0129] In this embodiment, the average of the inlet temperature and the outlet temperature is determined as the second temperature. In other embodiments, the characteristic temperature can also be calculated based on the inlet temperature and the corresponding first weight, and the outlet temperature and the corresponding second weight, where the first weight and the second weight can be determined based on the indoor ambient temperature and the defrosting time.

[0130] In this embodiment, all indoor units are in the evaporation state in the defrost mode, and the second temperature corresponding to each indoor unit can be determined, and the characteristic temperature of the indoor heat exchanger can be determined according to all the determined second temperatures. In other embodiments, some indoor units are in the evaporation state in the defrost mode, and the second temperature corresponding to the indoor units in the evaporation state in the defrost mode can be determined, and the characteristic temperature of the indoor heat exchanger can be determined according to all the acquired second temperatures.

[0131] In this embodiment, the lowest temperature among more than one second temperatures is determined as the characteristic temperature of the indoor heat exchanger. In other embodiments, the average of more than one second temperatures may also be determined as the characteristic temperature of the indoor heat exchanger.

[0132] In this embodiment, when the number of indoor units is more than one, the characteristic temperature of the indoor heat exchanger used to determine the target duration is determined based on the second temperature determined according to the inlet and outlet temperatures corresponding to the more than one indoor units. This is beneficial to ensure that the determined characteristic temperature of the indoor heat exchanger can accurately reflect the overall frost risk of more than one indoor units, and ensure that the reversing component can effectively reduce the frost risk of each indoor unit when operating in the second state.

[0133] 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 preset condition includes at least one of the following conditions:

[0134] The indoor ambient temperature corresponding to the heat pump system is lower than the first preset ambient temperature;

[0135] The defrost time of the heat pump system when it last ran the defrost mode is longer than the preset time;

[0136] The characteristic temperature of the indoor heat exchanger in the indoor unit is less than a preset temperature;

[0137] The outdoor ambient temperature corresponding to the heat pump system is less than or equal to a second preset ambient temperature.

[0138] For example, the preset time length is 4 seconds, the preset temperature is 20°C, the first preset ambient temperature is 20°C, and the preset ambient temperature is 3°C.

[0139] In one implementation of this embodiment, the indoor ambient temperature, defrost time, characteristic temperature of the indoor heat exchanger and outdoor ambient temperature can be directly obtained. When at least one parameter meets the above conditions, it can be determined that the operation of the heat pump system meets the preset conditions.

[0140] In another implementation of this embodiment, when the parameters for determining the target duration include the indoor ambient temperature and / or the defrost time and / or the characteristic temperature of the indoor heat exchanger, the target duration can be determined in the manner mentioned in the above embodiment. When the target duration is greater than the preset duration (for example, 0), it can be determined that the indoor ambient temperature is lower than the first preset ambient temperature and / or the defrost time is greater than the preset time and / or the characteristic temperature of the indoor heat exchanger is lower than the preset temperature, that is, the operation of the heat pump system meets the preset conditions.

[0141] In this embodiment, when the indoor ambient temperature, the defrost time, the characteristic temperature of the indoor heat exchanger, and the outdoor ambient temperature all meet the above conditions, it can be considered that the operation of the heat pump system has reached the preset condition. In other embodiments, when one, two, or three of the indoor ambient temperature, the defrost time, the characteristic temperature of the indoor heat exchanger, and the outdoor ambient temperature meet the above conditions, it is considered that the operation of the heat pump system has reached the preset condition.

[0142] In this embodiment, the indoor ambient temperature is too low, the defrost time is too long, the indoor heat exchanger temperature is too low, and the outdoor ambient temperature is too low, which may indicate that the indoor heat exchanger has a high risk of frosting when the defrost mode is running or after it ends. Therefore, setting the preset conditions in the above manner is conducive to accurately and timely detecting the frosting risk of the defrost mode, and timely controlling the reversing component to switch to the second state operation, so as to effectively reduce the frosting risk of the indoor heat exchanger and improve the defrosting effect of the outdoor heat exchanger.

[0143] 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 indoor unit includes an indoor heat exchanger and a first control valve connected in series with the indoor heat exchanger, and the control method of the heat pump system further includes:

[0144] Controlling the reversing assembly to operate in the first state so that both the outdoor heat exchanger and the indoor unit are connected to the return air port of the compressor, and controlling the first control valve to operate at an opening less than a preset opening;

[0145] When the operation of the heat pump system reaches the preset condition, the reversing assembly is controlled to operate in the second state to connect the indoor unit with the exhaust port of the compressor, and the first control valve is controlled to operate at an opening greater than or equal to the preset opening.

[0146] In this embodiment, the preset opening is the minimum opening of the first control valve. When the reversing component operates in the first state, the first control valve is closed, and all the heat in the heat pump system is used to store heat in the energy storage device, so as to effectively improve the heat storage efficiency of the energy storage device. When the reversing component operates in the second state, the first control valve operates with the minimum opening.

[0147] In other embodiments, when the reversing assembly operates in the first state, the first control valve may also be opened at a very small opening less than a preset opening to effectively improve the reliability of system operation. When the reversing assembly operates in the second state, the first control valve operates at a larger opening than in the first state to increase the heat of the indoor heat exchanger.

[0148] In this embodiment, when a first control valve is provided in the indoor unit, it is adapted to the operating state of the reversing component and is operated with different openings, wherein the first control valve of the reversing component in the second state operates with a larger opening than that in the first state, thereby ensuring that the temperature of the indoor heat exchanger can be effectively increased when there is a risk of frost on the indoor heat exchanger, thereby effectively reducing the risk of frost on the indoor heat exchanger.

[0149] Further, based on any of the above embodiments, another optional embodiment of the control method of the heat pump system of the present application is proposed. Figure 5 , the control method of the heat pump system further includes:

[0150] Step S01, when the operation of the heat pump system reaches the start condition of the defrost mode, controlling the reversing component to operate in a third state, so that the outdoor heat exchanger is connected to the exhaust port of the compressor, and the indoor unit is connected to the return air port of the compressor;

[0151] In this embodiment, when the reversing component operates in the first state, it identifies whether the heat pump system has reached the start-up conditions of the defrost mode. When the heat pump system has reached the start-up conditions of the defrost mode, it indicates that the outdoor heat exchanger is frosted. The reversing component can be controlled to operate in the third state to connect the outdoor heat exchanger with the exhaust port of the compressor, and the indoor unit with the return air port of the compressor, so as to defrost the outdoor heat exchanger.

[0152] In the process of controlling the reversing assembly to operate in the third state: the first reversing valve is controlled to operate in the second valve position, the second reversing valve is controlled to operate in the fourth valve position, the outdoor heat exchanger is connected to the exhaust port of the compressor, the indoor unit is connected to the return air port of the compressor, a part of the refrigerant discharged by the compressor flows into the refrigerant branch, and the heat in the refrigerant is stored in the energy storage device when flowing through the energy storage device, and the refrigerant flowing out of the refrigerant branch flows through the indoor unit for heat exchange and then flows back to the compressor; another part of the refrigerant discharged by the compressor flows into the outdoor heat exchanger to release heat, and the refrigerant flowing out of the outdoor heat exchanger flows through the throttling device and the indoor unit in turn for heat exchange and then flows back to the compressor. In the third state, the outdoor heat exchanger is in a condensing state, and the indoor heat exchanger is in an evaporating state. At this time, the heat pump system can use the heat of the refrigerant flowing through the outdoor heat exchanger to melt the frost in the outdoor unit.

[0153] In other embodiments, when the reversing assembly operates in the third state, the second control valve on the refrigerant branch can also be closed, and the refrigerant discharged from the compressor can all flow into the outdoor heat exchanger for defrosting.

[0154] Step S02, when the heat pump system reaches the exit condition of the defrost mode, the step of controlling the reversing component to operate in a first state so that the outdoor heat exchanger and the indoor unit are both connected to the return air port of the compressor is executed.

[0155] After step S10, when the reversing component operates in the first state for a preset time, it is identified whether the operation of the heat pump system meets the above preset conditions.

[0156] In this embodiment, after the heat pump system exits the defrost mode and enters the separate energy storage mode, when the separate energy storage mode identifies that the indoor heat exchanger has a defrost risk, the reversing component is switched to the second state to preheat the indoor heat exchanger, thereby effectively reducing the risk of frost on the indoor heat exchanger and ensuring that the defrost efficiency is effectively improved after the heat pump system subsequently enters the defrost mode.

[0157] 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.

[0158] 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.

[0159] 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.

[0160] 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.

[0161] 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 refrigerant main circuit and a refrigerant branch circuit, the refrigerant main circuit includes an indoor unit, an outdoor heat exchanger, a reversing assembly and a compressor, the indoor unit, the outdoor heat exchanger, the exhaust port of the compressor and the return air port of the compressor are all connected to the reversing assembly, the refrigerant branch circuit includes an energy storage device, the first end of the refrigerant branch circuit is connected to the exhaust port of the compressor, or the first end of the refrigerant branch circuit is connected to the exhaust port or the return air port of the compressor through the reversing assembly, the pipeline between the indoor unit and the outdoor heat exchanger is connected to the second end of the refrigerant branch circuit, and the control method of the heat pump system includes the following steps: Controlling the reversing assembly to operate in a first state so that the outdoor heat exchanger is in communication with the return air port of the compressor; When the operation of the heat pump system reaches a preset condition, controlling the reversing component to operate in a second state so that the indoor unit is connected to the exhaust port of the compressor; The preset condition indicates that there is a risk of frost on the indoor unit when the heat pump system operates in a defrost mode.

2. The control method of the heat pump system according to claim 1, characterized in that: Before the step of controlling the reversing component to operate in the second state when the operation of the heat pump system reaches a preset condition, the step further includes: Acquire the indoor ambient temperature corresponding to the heat pump system and / or the defrosting time of the heat pump system when the defrosting mode was last run and / or the characteristic temperature of the indoor heat exchanger in the indoor unit; Determine a target duration according to the indoor ambient temperature and / or the defrosting duration and / or the characteristic temperature; When the operation of the heat pump system reaches a preset condition, the step of controlling the reversing component to operate in the second state comprises: When the operation of the heat pump system reaches a preset condition, the reversing component is controlled to operate in the second state for the target time period.

3. The control method of the heat pump system according to claim 2, characterized in that: The step of determining the target duration according to the indoor ambient temperature and / or the defrosting duration and / or the characteristic temperature comprises: Determine a reference duration according to the indoor ambient temperature, determine a first correction duration according to the defrosting duration, and determine a second correction duration according to the characteristic temperature; The reference duration is corrected according to the first corrected duration and the second corrected duration to obtain the target duration.

4. The control method of the heat pump system according to claim 3, characterized in that: The indoor environment temperature is negatively correlated with the reference time, the defrosting time is positively correlated with the first correction time, and the second correction time is negatively correlated with the characteristic temperature.

5. The control method of the heat pump system according to claim 2, characterized in that: The number of indoor units is more than one, and the step of obtaining the indoor ambient temperature corresponding to the heat pump system includes: Acquiring a first temperature of an indoor environment adjusted by the indoor unit; The indoor ambient temperature is determined based on more than one of the first temperatures.

6. The control method of the heat pump system according to claim 2, characterized in that: The number of the indoor units is more than one, and the step of obtaining the characteristic temperature of the indoor heat exchanger in the indoor unit comprises: Obtaining the inlet temperature and outlet temperature of the indoor heat exchanger in the indoor unit; Determine a second temperature of the corresponding indoor heat exchanger according to the inlet temperature and the outlet temperature; Determining more than one of the second temperatures determines the characteristic temperature.

7. The control method of the heat pump system according to claim 1, characterized in that: The preset condition includes at least one of the following conditions: The indoor ambient temperature corresponding to the heat pump system is lower than the first preset ambient temperature; The defrost time of the heat pump system when it last ran the defrost mode is longer than the preset time; The characteristic temperature of the indoor heat exchanger in the indoor unit is less than a preset temperature; The outdoor ambient temperature corresponding to the heat pump system is less than or equal to a second preset ambient temperature.

8. The control method of a heat pump system according to any one of claims 1 to 7, characterized in that: The indoor unit includes an indoor heat exchanger and a first control valve connected in series with the indoor heat exchanger, and the control method of the heat pump system further includes: Controlling the reversing assembly to operate in the first state so that both the outdoor heat exchanger and the indoor unit are connected to the return air port of the compressor, and controlling the first control valve to operate at an opening less than a preset opening; When the operation of the heat pump system reaches the preset condition, the reversing assembly is controlled to operate in the second state to connect the indoor unit with the exhaust port of the compressor, and the first control valve is controlled to operate at an opening greater than or equal to the preset opening.

9. The control method of a heat pump system according to any one of claims 1 to 7, characterized in that: The control method of the heat pump system further includes: When the operation of the heat pump system reaches the start-up condition of the defrost mode, the reversing assembly is controlled to operate in a third state so that the outdoor heat exchanger is connected to the exhaust port of the compressor, and the indoor unit is connected to the return air port of the compressor; When the heat pump system reaches the exit condition of the defrost mode, the step of controlling the reversing component to operate in a first state is performed so that both the outdoor heat exchanger and the indoor unit are connected to the return air port of the compressor.

10. The control method of a heat pump system according to any one of claims 1 to 7, characterized in that: The reversing assembly includes a first reversing valve and a second reversing valve, the indoor unit, the return air port, and the exhaust port are respectively connected to different valve ports of the first reversing valve, the outdoor heat exchanger, the return air port, and the exhaust port are respectively connected to different valve ports of the second reversing valve, and the step of controlling the reversing assembly to operate in a first state so that the outdoor heat exchanger and the indoor unit are both connected to the return air port of the compressor includes: Controlling the first reversing valve to operate at a second valve position so that the return air port is connected to the indoor unit and the exhaust port is blocked from the indoor unit, and controlling the second reversing valve to operate at a fourth valve position so that the return air port is connected to the outdoor heat exchanger and the exhaust port is blocked from the outdoor heat exchanger; The step of controlling the reversing assembly to operate in the second state so that the indoor unit is connected to the exhaust port of the compressor comprises: The first reversing valve is controlled to switch to the first valve position so that the exhaust port is connected to the indoor unit and the return air port is blocked from the indoor unit, and the second reversing valve is controlled to maintain the fourth valve position.

11. A heat pump system, characterized in that: The heat pump system comprises a control device, a refrigerant main circuit and a refrigerant branch circuit, the refrigerant main circuit comprises an indoor unit, an outdoor heat exchanger, a reversing assembly and a compressor, the indoor unit, the outdoor heat exchanger, the exhaust port of the compressor and the return air port of the compressor are all connected to the reversing assembly, the refrigerant branch circuit comprises an energy storage device, a first end of the refrigerant branch circuit is communicated with the exhaust port of the compressor, and a pipeline between the indoor unit and the outdoor heat exchanger is connected to a second end of the refrigerant branch circuit; The reversing component 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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