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 main path comprises an indoor heat exchanger, an outdoor heat exchanger and a compressor, the refrigerant branch path comprises an energy storage device and a first control valve, and the method comprises the steps that when the heat pump system is in a preset mode, the first control valve is controlled to operate at a preset opening degree corresponding to the preset mode, in the preset mode, the indoor heat exchanger is in an evaporation state, and the refrigerant branch communicates with an exhaust port of the compressor; acquiring a first temperature of an energy storage medium in the energy storage device; when the first temperature meets a first preset condition, the first control valve is controlled to reduce the opening degree, and the first preset condition includes that the first temperature is larger than a first temperature threshold value corresponding to the preset mode. The invention aims to improve the condensation effect of the energy storage device so as to effectively improve the heat storage effect of the energy storage device.

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 using energy to regulate the indoor environment, the heat pump system will also be equipped with energy storage devices such as water tanks to provide the required energy for other needs. Among them, during the refrigeration process of the heat pump system, when the exhaust side of the compressor is connected to the pipeline where the energy storage device is located, the refrigerant discharged by the compressor can flow into the energy storage device to store heat in the energy storage device. However, in this process, the flow rate of the compressor flowing into the energy storage device is fixed, and the temperature of the energy storage medium in the energy storage device is prone to be too high, which will cause high system pressure and low refrigerant supercooling. The condensation effect of the refrigerant in the energy storage device is poor, resulting in the problem of poor heat storage effect of the energy storage device. 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 condensation effect of an energy storage device to effectively improve the heat storage effect of the energy storage device.

[0004] To achieve the above object, 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 heat exchanger, an outdoor heat exchanger and a compressor, and the refrigerant branch circuit comprises an energy storage device and a first control valve, and the control method for the heat pump system comprises the following steps:

[0005] When the heat pump system is in a preset mode, controlling the first control valve to operate at a preset opening corresponding to the preset mode, in which the indoor heat exchanger is in an evaporating state and the refrigerant branch is connected to the exhaust port of the compressor;

[0006] Acquiring a first temperature of an energy storage medium in the energy storage device;

[0007] When the first temperature meets a first preset condition, the first control valve is controlled to reduce its opening degree, and the first preset condition includes that the first temperature is greater than a first temperature threshold corresponding to the preset mode.

[0008] Optionally, after the step of controlling the first control valve to reduce the opening degree when the first temperature meets the first preset condition, the method further includes:

[0009] Acquiring a second temperature of the energy storage medium in the energy storage device;

[0010] When the second temperature meets a second preset condition, controlling the first control valve to operate at the preset opening;

[0011] The second preset condition includes that the second temperature is lower than a second temperature threshold corresponding to the preset mode, and the second temperature threshold is lower than the first temperature threshold.

[0012] Optionally, after the step of controlling the first control valve to reduce the opening degree when the first temperature meets the first preset condition, the method further includes:

[0013] Acquiring a second temperature of the energy storage medium in the energy storage device;

[0014] When the second temperature meets a third preset condition, controlling the first control valve to maintain a current opening;

[0015] The third preset condition includes that the second temperature is greater than or equal to a second temperature threshold, and the second temperature is less than or equal to the first temperature threshold, and the second temperature threshold is less than the first temperature threshold.

[0016] Optionally, the step of controlling the first control valve to operate at a preset opening corresponding to the preset mode includes:

[0017] When the preset mode is the first preset mode, controlling the first control valve to operate at a first preset opening;

[0018] When the preset mode is the second preset mode, controlling the first control valve to operate at a minimum opening;

[0019] The energy storage device corresponding to the first preset mode is in an energy storage state, the energy storage device corresponding to the second preset mode is in a stopped energy storage state, and the first preset opening is greater than the minimum opening.

[0020] Optionally, the control method of the heat pump system further includes:

[0021] When the preset mode is the first preset mode, obtaining a current condensing pressure of the heat pump system;

[0022] The first temperature threshold and / or the second temperature threshold is determined according to the saturation temperature corresponding to the condensation pressure.

[0023] Optionally, the step of determining the first temperature threshold and / or the second temperature threshold according to the saturation temperature corresponding to the condensing pressure includes:

[0024] reducing the saturation temperature according to a first preset value to obtain the first temperature threshold;

[0025] reducing the saturation temperature according to a second preset value to obtain the second temperature threshold;

[0026] Wherein, the second preset value is greater than the first preset value.

[0027] Optionally, the control method of the heat pump system further includes:

[0028] When the preset mode is the second preset mode, the protection temperature of the energy storage device is determined to be the first temperature threshold.

[0029] Optionally, when the heat pump system is in a preset mode, before the step of controlling the first control valve to operate at a preset opening corresponding to the preset mode, the method further includes:

[0030] Acquiring a third temperature of the energy storage medium in the energy storage device;

[0031] When the third temperature is lower than the target medium temperature, determining the first preset mode as the preset mode;

[0032] When the third temperature is greater than or equal to the target medium temperature, determining the second preset mode as the preset mode;

[0033] The energy storage device corresponding to the first preset mode is in an energy storage state, the energy storage device corresponding to the second preset mode is in a stopped energy storage state, and the preset opening corresponding to the first preset mode is greater than the preset opening corresponding to the second preset mode.

[0034] Optionally, the refrigerant main circuit further includes a reversing component, the reversing component includes a first reversing valve and a second reversing valve, one end of the refrigerant branch is communicated with the exhaust port of the compressor, and the pipeline between the indoor unit and the outdoor heat exchanger is communicated with the other end of the refrigerant branch, and before the step of controlling the first control valve to operate at a preset opening corresponding to the preset mode, it also includes:

[0035] Controlling the first reversing valve to operate at a first valve position, and controlling the second reversing valve to operate at a third valve position, so that the heat pump system starts the preset mode;

[0036] Or, controlling the first reversing valve to operate at a first valve position, and controlling the second reversing valve to operate at a fourth valve position, so that the heat pump system starts the preset mode;

[0037] Wherein, under the first valve position, the return air port of the compressor is connected to the indoor heat exchanger, and the exhaust port of the compressor is blocked from the indoor heat exchanger, under the third valve position, the exhaust port of the compressor is connected to the outdoor heat exchanger, and the return air port of the compressor is blocked from the outdoor heat exchanger, and under the fourth valve position, the exhaust port of the compressor is blocked from the outdoor heat exchanger, and the return air port of the compressor is connected to the outdoor heat exchanger.

[0038] 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 heat exchanger, an outdoor heat exchanger and a compressor, and the refrigerant branch circuit includes an energy storage device and a first control valve;

[0039] The compressor and the first control device are both 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, and 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.

[0040] 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.

[0041] The present invention proposes a control method for a heat pump system. In addition to a refrigerant main circuit including a compressor, an indoor unit, an outdoor heat exchanger and a reversing component, the heat pump system is also provided with a refrigerant branch circuit including an energy storage device and a first control valve. When the heat pump system operates in a preset mode to cool the indoor environment and the refrigerant branch circuit is connected to the exhaust gas of the compressor, the first control valve first operates at a preset opening corresponding to the preset mode. During this process, when it is detected that the temperature of the energy storage medium in the energy storage device is in an overly high state, the first control valve is controlled to reduce the opening to avoid the energy storage medium temperature from being too high. The system pressure can be effectively reduced and the supercooling degree of the refrigerant in the refrigerant branch circuit can be effectively improved, thereby effectively improving the condensing effect of the energy storage device and the heat storage effect of the energy storage device. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 A schematic diagram of the refrigerant pipeline structure and a schematic diagram of the refrigerant flow direction in the first mode in an embodiment of the heat pump system of the present invention;

[0043] Figure 2 A schematic diagram of the refrigerant pipeline structure in an embodiment of the heat pump system of the present invention and a schematic diagram of the refrigerant flow direction in the second mode;

[0044] Figure 3 A schematic diagram of the refrigerant pipeline structure in an embodiment of the heat pump system of the present invention and a schematic diagram of the refrigerant flow direction in the third mode;

[0045] Figure 4 A schematic diagram of the refrigerant pipeline structure in an embodiment of a heat pump system of the present invention and a schematic diagram of the refrigerant flow direction in a fourth mode;

[0046] Figure 5A schematic diagram of the hardware structure involved in the operation of an embodiment of a heat pump system of the present invention;

[0047] Figure 6 A schematic flow chart of an embodiment of a control method for a heat pump system of the present invention;

[0048] Figure 7 A schematic flow chart of another embodiment of a control method for a heat pump system of the present invention;

[0049] Figure 8 A schematic flow chart of another embodiment of a control method for a heat pump system of the present invention;

[0050] Fig. 9 This is a flow chart of another optional embodiment of the control method of the heat pump system of the present invention.

[0051] 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

[0052] 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.

[0053] An embodiment of the present invention provides a heat pump system.

[0054] In the embodiment of the present invention, refer to Figures 1 to 5 The heat pump system includes a control device 100, a refrigerant main circuit and a refrigerant branch circuit, wherein the refrigerant main circuit includes a compressor 1, an indoor unit, an outdoor heat exchanger 3, a throttling device 4 and a reversing component 5, and the refrigerant branch circuit includes an energy storage device 7 and a first control valve 8. The indoor unit, the reversing component 5, the compressor 1, the throttling device 4 and the first control valve 8 are all connected to the control device 100. The throttling device 4 and the first control valve 8 can be electronic expansion valves.

[0055] In this embodiment, the energy storage device 7 is loaded with an energy storage medium (such as water, etc.). When the refrigerant in the refrigerant branch flows through the energy storage device 7, it can exchange heat with the energy storage medium therein, and the energy storage medium can absorb and store the energy flowing through the refrigerant. In this embodiment, the energy storage device 7 includes a water tank. In other embodiments, the energy storage device 7 may also include other types of devices with energy storage functions.

[0056] In an implementation of this embodiment, one 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 3 is connected to the other end of the refrigerant branch.

[0057] In another implementation of this embodiment, the heat pump system may also be provided with a flow direction regulating member, the pipeline between the indoor unit and the outdoor heat exchanger 3 is connected to the second end of the refrigerant branch, the return air port of the compressor 1, the exhaust port of the compressor 1 and the first end of the refrigerant branch are all connected to the flow direction regulating member, and the refrigerant branch is switched between being connected to the return air port of the compressor 1 and being connected to the exhaust port of the compressor 1 through the flow direction regulating member. The refrigerant branch is connected to the exhaust port of the compressor 1 through one end of the refrigerant branch.

[0058] In this embodiment, the number of the indoor unit is one. In other embodiments, the number of the indoor unit may be more than one, and more than one indoor unit may be connected in parallel.

[0059] The indoor unit includes an indoor heat exchanger 21 and a second control valve 22 connected in series with the indoor heat exchanger 21. The second control valve 22 is connected to the control device 100, and the control device 100 can be used to control the refrigerant flow through the indoor heat exchanger 21. The second control valve 22 can be an electronic expansion valve.

[0060] The indoor unit, the throttling device 4 and the outdoor heat exchanger 3 are connected in sequence, and the pipeline between the throttling device 4 and the indoor unit is connected to one end of the refrigerant branch. The indoor unit, the outdoor heat exchanger 3, the exhaust port of the compressor 1 and the return air port of the compressor 1 are all connected to the reversing component 5. The reversing component 5 can be used to switch the connection state between the indoor unit and the outdoor heat exchanger 3 and the exhaust port of the compressor 1 and the return air port of the compressor 1.

[0061] In this embodiment, the reversing assembly 5 includes a first reversing valve 51 and a second reversing valve 52. The exhaust port of the compressor 1, the return air port of the compressor 1, and the indoor unit are respectively connected to different valve ports of the first reversing valve 51, and the exhaust port of the compressor 1, the return air port of the compressor 1, and the outdoor heat exchanger 3 are respectively connected to different valve ports of the second reversing valve 52. In one implementation of this embodiment, the first reversing valve 51 is a first four-way valve, and the second reversing valve 52 is a second four-way valve. In another implementation of this embodiment, the first reversing valve 51 is a first three-way valve, and the second reversing valve 52 is a second three-way valve.

[0062] The first reversing valve 51 has a first valve position and a second valve position. In the first valve position, the return air port of the compressor 1 is connected to the indoor heat exchanger 21, and the exhaust port of the compressor 1 is blocked from the indoor heat exchanger 21. In the second valve position, the return air port of the compressor 1 is blocked from the indoor heat exchanger 21, and the exhaust port of the compressor 1 is connected to the indoor heat exchanger 21.

[0063] The second reversing valve 52 has a third valve position and a fourth valve position. In the third valve position, the exhaust port of the compressor 1 is connected to the outdoor heat exchanger 3, and the return air port of the compressor 1 is blocked from the outdoor heat exchanger 3; in the fourth valve position, the exhaust port of the compressor 1 is blocked from the outdoor heat exchanger 3, and the return air port of the compressor 1 is connected to the outdoor heat exchanger 3.

[0064] In some embodiments, the reversing assembly 5 may further include a switching valve (not shown), and the reversing assembly 5 (switching valve) may be used to switch the connection state between the energy storage device 7 and the exhaust port of the compressor 1 and the return port of the compressor 1. The switching valve may be a three-way valve or a four-way valve, and the switching valve includes a first switching state and a second switching state; when the switching valve is in the first switching state, the return port of the compressor 1 is connected to the energy storage device 7; when the switching valve is in the second switching state, the exhaust port of the compressor 1 is connected to the energy storage device 7.

[0065] Through the regulation of the first reversing valve 51, the second reversing valve 52, the first control valve 8 and the second control valve 22, the operation modes of the heat pump system include but are not limited to the following modes:

[0066] In the first mode, refer to Figure 1 , the first reversing valve 51 operates at the first valve position, the second reversing valve 52 operates at the fourth valve position, the second control valve 22 is closed, and the first control valve 8 is opened. When the reversing assembly 5 includes a switching valve, the switching valve is in the second switching state, the exhaust port of the compressor 1 is connected to the energy storage device 7, and all the refrigerant discharged from the compressor 1 flows into the refrigerant branch. The heat of the refrigerant flowing into the refrigerant branch is stored in the energy storage device 7 when flowing through the energy storage device 7. The refrigerant flowing out of the refrigerant branch flows through the throttling device 4 and the outdoor heat exchanger 3 in turn and then flows back to the compressor 1. In the first mode, the indoor heat exchanger 21 stops heat exchange, the outdoor heat exchanger 3 is in an evaporating state, and all heat is used to store heat in the energy storage device 7. In the first mode, the energy storage device 7 can store heat separately.

[0067] In the second mode, refer to Figure 2, the first reversing valve 51 operates at the first valve position, the second reversing valve 52 operates at the third valve position, the first control valve 8 is opened, and the second control valve 22 is opened. When the reversing assembly 5 includes a switching valve, the switching valve is in the second switching state, the exhaust port of the compressor 1 is connected to the energy storage device 7, a part of the refrigerant discharged by the compressor 1 flows through the outdoor heat exchanger 3 and the throttling device 4 in sequence, and another part of the refrigerant discharged by the compressor 1 flows into the refrigerant branch. The heat of the refrigerant flowing into the refrigerant branch is stored in the energy storage device 7 when flowing through the energy storage device 7. The refrigerant flowing out of the refrigerant branch merges with the refrigerant flowing out of the throttling device 4 and flows into the indoor unit for evaporation and then flows back to the compressor 1. In the second mode, the indoor heat exchanger 21 is in the evaporation state, and the outdoor heat exchanger 3 is in the condensation state. In the second mode, when the indoor space regulated by the indoor unit has a heat exchange demand, the indoor fan in the indoor unit can be turned on to drive the indoor air to exchange heat with the indoor heat exchanger 21; in the second mode, when the indoor space regulated by the indoor unit does not have a heat exchange demand, the indoor fan in the indoor unit can be turned off. In the second mode, the heat absorbed by the outdoor heat exchanger 3 from the environment can be stored in the energy storage device 7. In the second mode, the indoor environment can be cooled while the energy storage device 7 stores heat or the compressor 1 oil in the refrigerant branch can be returned to the compressor 1 while the energy storage device 7 stores heat.

[0068] In the third mode, refer to Figure 3 , the first reversing valve 51 operates at the first valve position, the second reversing valve 52 operates at the fourth valve position, the first control valve 8 is opened, and the second control valve 22 operates in throttling. When the reversing assembly 5 includes a switching valve, the switching valve is in the second switching state, the exhaust port of the compressor 1 is connected to the energy storage device 7, and all the refrigerant discharged from the compressor 1 flows into the refrigerant branch. The heat of the refrigerant flowing into the refrigerant branch is stored in the energy storage device 7 when flowing through the energy storage device 7. A part of the refrigerant flowing out of the refrigerant branch flows through the throttling device 4 and the outdoor heat exchanger 3 in turn and then flows back to the compressor 1. The other part of the refrigerant flowing out of the refrigerant branch flows through the second control valve 22 and the indoor heat exchanger 21 in turn and then flows back to the compressor 1. In the third mode, the indoor heat exchanger 21 and the outdoor heat exchanger 3 are both in the evaporation state. In the third mode, when the indoor space regulated by the indoor unit has a heat exchange demand, the indoor fan in the indoor unit can be turned on to drive the indoor air to exchange heat with the indoor heat exchanger 21; in the third mode, when the indoor space regulated by the indoor unit does not have a heat exchange demand, the indoor fan in the indoor unit can be turned off. In the third mode, the heat absorbed by the indoor heat exchanger 21 and the outdoor heat exchanger 3 from their environment can be stored in the energy storage device 7. In the third mode, the indoor environment can be cooled while the energy storage device 7 stores heat.

[0069] In the fourth mode, refer to Figure 4, the first reversing valve 51 operates at the first valve position, the second reversing valve 52 operates at the third valve position, the first control valve 8 is closed, and the second control valve 22 is opened. The refrigerant discharged from the compressor 1 flows through the outdoor heat exchanger 3, the throttling device 4, the second control valve 22, and the indoor heat exchanger 21 in sequence and then flows back to the compressor 1. In the fourth mode, the indoor heat exchanger 21 is in an evaporating state and the outdoor heat exchanger 3 is in a condensing state. In the fourth mode, when the indoor space regulated by the indoor unit has a heat exchange demand, the indoor fan in the indoor unit can be turned on to drive the indoor air to exchange heat with the indoor heat exchanger 21; in the fourth mode, when the indoor space regulated by the indoor unit does not have a heat exchange demand, the indoor fan in the indoor unit can be turned off. In the fourth mode, the indoor environment can be cooled while the energy storage device 7 stops storing heat.

[0070] In other embodiments, the reversing assembly 5 may also include a third four-way valve, and the exhaust port of the compressor 1, the return air port of the compressor 1, the indoor heat exchanger 21 and the outdoor heat exchanger 3 are respectively connected to different valve ports of the third four-way valve.

[0071] Further, see Figures 1 to 5 The heat pump system further includes a pressure sensor 01 , which can be disposed on the exhaust side of the compressor 1 to detect the condensing pressure of the heat pump system. The pressure sensor 01 is connected to the control device 100 .

[0072] Further, see Figure 5 The heat pump system further includes a temperature detection module 02, which is connected to the control device 100. The temperature detection module 02 can be arranged inside the energy storage device 7 to detect the temperature of the energy storage medium in the energy storage device 7.

[0073] In the embodiment of the present invention, refer to Figure 5 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.

[0074] Those skilled in the art will understand that Figure 5 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.

[0075] like Figure 5 As shown, the memory 1002 as a computer storage medium may include a control program for the heat pump system.

[0076] exist Figure 5 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.

[0077] 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.

[0078] Reference Figure 6 , 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:

[0079] Step S10, when the heat pump system is in a preset mode, controlling the first control valve to operate at a preset opening corresponding to the preset mode, in which the indoor heat exchanger is in an evaporating state and the refrigerant branch is connected to the exhaust port of the compressor;

[0080] The preset mode here may include the second mode or the third mode mentioned above. Different preset modes correspond to different indoor cooling capacities, and / or different preset modes correspond to different heat storage requirements of the energy storage device.

[0081] Different preset modes correspond to preset openings, and the required cooling capacity corresponding to the preset mode is negatively correlated with the corresponding preset opening, and the heat storage demand corresponding to the preset mode is positively correlated with the corresponding preset opening.

[0082] In the preset mode, the indoor fan corresponding to the indoor heat exchanger is turned on, which can drive the indoor air in the indoor space conditioned by the indoor unit to exchange heat with the indoor heat exchanger.

[0083] Step S20, obtaining a first temperature of the energy storage medium in the energy storage device;

[0084] The first temperature can be specifically detected by a temperature detection module provided in the energy storage device. In one implementation, the current temperature of the energy storage device is obtained as the first temperature. In another implementation, multiple first temperatures detected in real time by the energy storage device within a first preset time period are obtained.

[0085] Step S30: When the first temperature satisfies a first preset condition, controlling the first control valve to reduce its opening degree, wherein the first preset condition includes that the first temperature is greater than a first temperature threshold corresponding to the preset mode.

[0086] When the heat pump system is in the first preset mode, the first temperature threshold may be the sum or difference between the condensing temperature of the heat pump system at the current moment or the current time period and the first preset deviation value, or the sum or difference between the saturation temperature corresponding to the condensing pressure of the heat pump system at the current moment or the current time period and the first preset deviation value; when the heat pump system is in the second preset mode, the first temperature threshold may be the maximum temperature of the energy storage medium allowed to reach without damaging the energy storage device.

[0087] When the heat pump system is in the first preset mode, and the first temperature is greater than the first temperature threshold corresponding to the preset mode, it indicates that the system pressure of the heat pump system in the preset mode is too high, and the supercooling degree of the refrigerant is low, resulting in poor heating effect of the energy storage device. When the heat pump system is in the second preset mode, and the first temperature is greater than the first temperature threshold corresponding to the preset mode, it indicates that there is a risk of damage to the energy storage device in the preset mode.

[0088] In an implementation of this embodiment, when the current first temperature of the energy storage device is greater than the first temperature threshold, the first control valve is controlled to reduce its opening degree.

[0089] In another implementation of this embodiment, when it is continuously detected within a first preset time period that a plurality of first temperatures of the energy storage device are all greater than a first temperature threshold, the first control valve is controlled to reduce its opening.

[0090] In this embodiment, the first control valve reduces the opening to a preset target opening, and the preset target opening is less than the preset opening. In other embodiments, the opening adjustment value may be determined according to the actual operating state parameters of the heat pump system (for example, the temperature difference between the indoor temperature corresponding to the indoor unit and the set temperature and / or the indoor fan speed and / or the temperature difference between the first temperature and the saturation temperature mentioned later, etc.), and the preset opening is reduced according to the opening adjustment value to obtain the target opening, and the first control valve is controlled to operate at the target opening.

[0091] The target opening can be 0pls, that is, the first control valve is closed. If the heat pump system operates in the second mode, when the first temperature meets the first preset condition and the first control valve needs to be closed, the first control valve can be directly closed. After the first control valve is closed, the heat pump system is in the fourth mode. If the heat pump system operates in the third mode, when the first temperature meets the first preset condition and the first control valve needs to be closed, the valve position of the second reversing valve 52 needs to be switched to the third valve position, and the first control valve needs to be closed, so that the heat pump system is in the fourth mode.

[0092] A control method for a heat pump system is proposed in an embodiment of the present invention. In addition to a refrigerant main circuit including a compressor, an indoor unit, an outdoor heat exchanger and a reversing component, the heat pump system is also provided with a refrigerant branch circuit including an energy storage device and a first control valve. When the heat pump system operates in a preset mode to cool the indoor environment and the refrigerant branch circuit is connected to the exhaust gas of the compressor, the first control valve first operates at a preset opening corresponding to the preset mode. During this process, when it is detected that the temperature of the energy storage medium in the energy storage device is in an overly high state, the first control valve is controlled to reduce the opening to avoid the energy storage medium temperature from being too high. The system pressure can be effectively reduced and the supercooling degree of the refrigerant in the refrigerant branch circuit can be effectively improved, thereby effectively improving the condensing effect of the energy storage device and the heat storage effect of the energy storage device.

[0093] Furthermore, in this embodiment, after step S20, it also includes: when the first temperature does not meet the first preset condition, controlling the first control valve to maintain the current opening, and when the current opening is the preset opening, controlling the first control valve to maintain the preset opening.

[0094] 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 7 , after step S30, further comprising:

[0095] Step S40, obtaining a second temperature of the energy storage medium in the energy storage device;

[0096] The second temperature can be specifically detected by a temperature detection module provided in the energy storage device. In one implementation, the current temperature of the energy storage medium in the energy storage device is obtained as the second temperature. In another implementation, multiple second temperatures of the energy storage medium in the energy storage device detected in real time within a second preset time period are obtained.

[0097] Step S50, when the second temperature meets the second preset condition, control the first control valve to operate at the preset opening; wherein the second preset condition includes that the second temperature is less than a second temperature threshold corresponding to the preset mode, and the second temperature threshold is less than the first temperature threshold.

[0098] The second temperature threshold may be a preset fixed value, or may be obtained by reducing the first temperature threshold according to the adjustment value.

[0099] When the heat pump system is in the first preset mode, the second temperature threshold may be the sum or difference between the condensing temperature of the heat pump system at the current moment or the current time period and the second preset deviation value, or the sum or difference between the saturation temperature corresponding to the condensing pressure of the heat pump system at the current moment or the current time period and the second preset deviation value. When the heat pump system is in the second preset mode, the second temperature threshold may be the target temperature of the energy storage medium.

[0100] When the heat pump system is in the first preset mode, and the second temperature is less than the second temperature threshold corresponding to the preset mode, it indicates that the system pressure of the heat pump system in the preset mode is too low, and the supercooling degree of the refrigerant is high, resulting in poor heating effect of the energy storage device. When the heat pump system is in the second preset mode, and the second temperature is less than the second temperature threshold corresponding to the preset mode, it indicates that the temperature of the energy storage medium in the preset mode is lower than the target temperature.

[0101] In an implementation of this embodiment, when the current second temperature of the energy storage device is less than the second temperature threshold, the first control valve is controlled to resume operation at a preset opening.

[0102] In another implementation of this embodiment, when it is continuously detected within a second preset time period that multiple second temperatures of the energy storage medium in the energy storage device are all less than the second temperature threshold, the first control valve is controlled to resume operation at a preset opening.

[0103] In this embodiment, after the opening of the first control valve is reduced, when it is detected that the temperature of the energy storage medium is low, the first control valve is controlled to return to the preset opening, thereby increasing the heat stored in the energy storage device, thereby ensuring that the heat storage amount of the energy storage device can be accurately matched with the heat storage demand corresponding to the current preset mode.

[0104] In other embodiments, when the second temperature is less than the first temperature threshold, the first control valve may be controlled to operate at a preset opening. When the first temperature does not meet the first preset condition, the process of the first control valve maintaining the current opening may also obtain the second temperature of the energy storage medium in the energy storage device.

[0105] 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. After step S30, it also includes: obtaining a second temperature of the energy storage medium in the energy storage device; when the second temperature meets a third preset condition, controlling the first control valve to maintain the current opening;

[0106] The third preset condition includes that the second temperature is greater than or equal to the second temperature threshold, and the second temperature is less than or equal to the first temperature threshold, and the second temperature threshold is less than the first temperature threshold.

[0107] When the second temperature is greater than or equal to the second temperature threshold, and the second temperature is less than or equal to the first temperature threshold, the first control valve is controlled to maintain a current opening, wherein when the current opening is a reduced opening, the first control valve is controlled to maintain a reduced opening.

[0108] It should be noted that the "obtaining the second temperature of the energy storage medium in the energy storage device" here can be the same step as the above step S40. After the second temperature is obtained, if the second temperature meets the second preset condition, the first control valve is controlled to operate at a preset opening; if the second temperature meets the third preset condition, the first control valve is controlled to maintain the reduced opening. The execution order between step S50 and the step "when the second temperature meets the third preset condition, the first control valve is controlled to maintain the current opening" here is not specifically limited.

[0109] Further, after controlling the first control valve to maintain the current opening, the process returns to step S20.

[0110] In this embodiment, after the first control valve reduces its opening, the temperature of the energy storage medium in the energy storage device decreases, but does not drop below the second temperature threshold. The first control valve maintains its current relatively small opening, which is beneficial for meeting the heat storage demand in the preset mode while improving system stability.

[0111] In other embodiments, when the first temperature does not meet the first preset condition, the process of the first control valve maintaining the current opening degree can also obtain the second temperature of the energy storage medium in the energy storage device.

[0112] Furthermore, after step S50, the second temperature of the energy storage medium in the energy storage device may also be obtained, and when the second temperature meets the third preset condition, the first control valve is controlled to maintain the current opening. Based on this, after the opening of the first control valve is restored to the preset opening, the temperature of the energy storage medium in the energy storage device does not rise above the first temperature threshold, and the first control valve maintains the current preset opening, which is conducive to meeting the heat storage demand in the preset mode while improving the system stability.

[0113] Further, in one embodiment, the step of controlling the first control valve to operate at a preset opening corresponding to the preset mode includes: when the preset mode is a first preset mode, controlling the first control valve to operate at a first preset opening; when the preset mode is a second preset mode, controlling the first control valve to operate at a minimum opening; wherein the energy storage device corresponding to the first preset mode is in an energy storage state, the energy storage device corresponding to the second preset mode is in a stopped energy storage state, and the first preset opening is greater than the minimum opening.

[0114] The first preset opening is a preset opening corresponding to the first preset mode, and the minimum opening is a preset opening corresponding to the second preset mode.

[0115] In the first preset mode, the heat pump system has an indoor cooling demand and a heat storage demand of the energy storage device. In the first preset mode, the energy storage device is in a heat storage state. The first preset mode includes the second mode or the third mode mentioned above. When the cooling demand is greater than the heat storage demand, the first preset mode is the second mode mentioned above; when the cooling demand is less than the heat storage demand, the first preset mode is the third mode mentioned above; when the cooling demand is equal to the heat storage demand, the first preset mode is the second mode or the third mode.

[0116] In this embodiment, the first preset opening is the maximum opening of the first control valve. In other embodiments, the first preset opening may also be an opening determined according to the actual operation of the heat pump system, for example, an opening determined according to the supercooling degree of the energy storage device.

[0117] For example, the preset opening of the first control valve corresponding to the first preset mode is 480 pls; when the first temperature satisfies the first preset condition, the opening of the first control valve is reduced to 55 pls.

[0118] In the second preset mode, the heat pump system has indoor cooling demand and does not have heat storage demand of the energy storage device. The second preset mode includes the fourth mode mentioned above.

[0119] The minimum opening degree is the opening degree of the first control valve required to be opened when the energy storage device has no heat storage demand so as to maintain the energy storage device at the target medium temperature and the system operates reliably.

[0120] For example, the preset opening of the first control valve corresponding to the second preset mode is 55 pls; when the first temperature satisfies the first preset condition, the opening of the first control valve is reduced to 0 pls.

[0121] 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 Figure 8 , the control method of the heat pump system further includes:

[0122] Step S100, when the preset mode is the first preset mode, obtaining the current condensing pressure of the heat pump system;

[0123] The condensation pressure is specifically detected by the above-mentioned pressure sensor.

[0124] Step S200: determining the first temperature threshold and / or the second temperature threshold according to the saturation temperature corresponding to the condensation pressure.

[0125] The saturation temperature can be obtained by calculating the condensing pressure or looking up the table.

[0126] The first temperature threshold and / or the second temperature threshold may be obtained by calculation or table lookup through the saturation temperature.

[0127] In one implementation of this embodiment, the saturation temperature is reduced according to a first preset value to obtain the first temperature threshold; the saturation temperature is reduced according to a second preset value to obtain the second temperature threshold; wherein the second preset value is greater than the first preset value.

[0128] For example, the saturation temperature (or the condensation temperature of the system) is defined as Tc, then the first temperature threshold is Tc-1, and the second temperature threshold is Tc-4.

[0129] In another implementation of this embodiment, the condensation temperature may be directly used as the first temperature threshold, and the second temperature threshold may be obtained by reducing the first temperature threshold according to a preset adjustment value.

[0130] Step S100 and step S200 may be performed during the execution of step S20 and / or step S40. The first temperature threshold and / or the second temperature threshold are determined based on the real-time detected condensing pressure during the process of controlling the first control valve based on the detected first temperature or second temperature of the energy storage device.

[0131] In this embodiment, when the preset mode is the first preset mode mentioned later, the first temperature threshold and / or the second temperature threshold may be determined according to step S100 and step S200, which is beneficial for the energy storage device to store heat while satisfying indoor cooling comfort. In other embodiments, when the preset mode is the second preset mode mentioned later, the first temperature threshold and / or the second temperature threshold may also be determined according to step S100 and step S200.

[0132] In this embodiment, when the system is cooling and storing energy at the same time, the saturation temperature corresponding to the condensing pressure can accurately reflect the current cooling effect of the system. Therefore, determining the first temperature threshold and / or the second temperature threshold based on the saturation temperature can accurately reflect the impact of the heat storage of the current energy storage device on the cooling effect of the system. The opening of the first control valve is precisely adjusted based on the first temperature threshold and the second temperature threshold, thereby effectively improving the cooling effect of the heat pump system while meeting the heat storage demand of the energy storage device.

[0133] In other embodiments, when the preset mode is the second preset mode, the first temperature threshold and / or the second temperature threshold may also be determined according to the condensation pressure.

[0134] 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. In this embodiment, the control method of the heat pump system further includes: determining that the protection temperature of the energy storage device is the first temperature threshold.

[0135] The protection temperature is the maximum temperature that the energy storage medium in the energy storage device is allowed to reach while protecting the energy storage device from damage.

[0136] In this embodiment, when the system is cooling alone, the protection temperature of the energy storage device can be determined as the first temperature threshold, which is conducive to ensuring that the energy storage device can be maintained above the target medium temperature while protecting the energy storage device. Here, taking the protection temperature as the first temperature threshold can ensure that when the energy storage device is at risk of damage, the opening of the first control valve is reduced in time to prevent the compressor exhaust from continuously heating the energy storage device and causing damage to it, thereby effectively improving the service life of the energy storage device.

[0137] In other embodiments, when the preset mode is the first preset mode, the protection temperature of the energy storage device may also be determined to be the first temperature threshold.

[0138] 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. Fig. 9 , before step S10, further comprising:

[0139] Step S01, obtaining a third temperature of the energy storage medium in the energy storage device;

[0140] The third temperature can be detected by the temperature detection module.

[0141] Step S02, when the third temperature is lower than the target medium temperature of the energy storage device, determining that the first preset mode is the preset mode, and the energy storage device corresponding to the first preset mode is in an energy storage state;

[0142] In the first preset mode, the heat pump system has an indoor cooling demand and a heat storage demand of the energy storage device. The first preset mode includes the second mode or the third mode mentioned above. When the cooling demand is greater than the heat storage demand, the first preset mode is the second mode mentioned above; when the cooling demand is less than the heat storage demand, the first preset mode is the third mode mentioned above; when the cooling demand is equal to the heat storage demand, the first preset mode is the second mode or the third mode.

[0143] In this embodiment, the preset opening corresponding to the first preset mode is the maximum opening of the first control valve. In other embodiments, the preset opening corresponding to the first preset mode can also be determined according to the actual operation of the heat pump system, for example, according to the degree of supercooling of the energy storage device.

[0144] For example, the preset opening of the first control valve corresponding to the first preset mode is 480 pls; when the first temperature satisfies the first preset condition, the opening of the first control valve is reduced to 55 pls.

[0145] Step S03: when the third temperature is greater than or equal to the target medium temperature, determining that the second preset mode is the preset mode, the energy storage device corresponding to the second preset mode is in a stopped energy storage state.

[0146] The preset opening corresponding to the first preset mode is greater than the preset opening corresponding to the second preset mode, and the preset opening corresponding to the second preset mode is the minimum opening.

[0147] In the second preset mode, the heat pump system has indoor cooling demand and does not have heat storage demand of the energy storage device. The second preset mode includes the fourth mode mentioned above.

[0148] The minimum opening degree is the opening degree of the first control valve required to be opened when the energy storage device has no heat storage demand so as to maintain the energy storage device at the target medium temperature and the system operates reliably.

[0149] For example, the preset opening of the first control valve corresponding to the second preset mode is 55 pls; when the first temperature satisfies the first preset condition, the opening of the first control valve is reduced to 0 pls.

[0150] In this embodiment, when the temperature of the energy storage medium in the energy storage device does not reach the target medium temperature, the heat pump system operates according to the first preset mode, which is conducive to meeting the indoor cooling demand and heat storage demand at the same time. When the temperature of the energy storage device reaches the target medium temperature, the heat pump system operates according to the second preset mode, which is conducive to improving the cooling effect of the heat pump system while keeping the energy storage device warm.

[0151] 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. In this embodiment, the reversing assembly includes a first reversing valve and a second reversing valve, and before the step of controlling the first control valve to operate at a preset opening corresponding to the preset mode, it also includes: controlling the first reversing valve to operate at a first valve position, and controlling the second reversing valve to operate at a third valve position, so that the heat pump system starts the preset mode; or, controlling the first reversing valve to operate at a first valve position, and controlling the second reversing valve to operate at a fourth valve position, so that the heat pump system starts the preset mode.

[0152] Wherein, under the first valve position, the return air port of the compressor is connected to the indoor heat exchanger, and the exhaust port of the compressor is blocked from the indoor heat exchanger, under the third valve position, the exhaust port of the compressor is connected to the outdoor heat exchanger, and the return air port of the compressor is blocked from the outdoor heat exchanger, and under the fourth valve position, the exhaust port of the compressor is blocked from the outdoor heat exchanger, and the return air port of the compressor is connected to the outdoor heat exchanger.

[0153] When the first preset mode is the second mode, the first reversing valve operates at the first valve position, the second reversing valve operates at the third valve position, the first control valve is opened, and the second control valve is opened. A part of the refrigerant discharged by the compressor 1 flows through the outdoor heat exchanger and the throttling device in sequence, and another part of the refrigerant discharged by the compressor flows into the refrigerant branch. The heat of the refrigerant flowing into the refrigerant branch is stored in the energy storage device when it flows through the energy storage device. The refrigerant flowing out of the refrigerant branch merges with the refrigerant flowing out of the throttling device and flows into the indoor unit for evaporation and then flows back to the compressor. In the second mode, the indoor heat exchanger is in an evaporating state, and the outdoor heat exchanger is in a condensing state. In the second mode, the indoor fan in the indoor unit is turned on to drive the indoor air to exchange heat with the indoor heat exchanger. In the second mode, the heat absorbed by the outdoor heat exchanger from its environment can be stored in the energy storage device. In the second mode, the energy storage device can store heat while the indoor environment is being cooled.

[0154] When the first preset mode is the third mode, the first reversing valve operates at the first valve position, the second reversing valve operates at the fourth valve position, the first control valve is opened, and the second control valve operates in throttling. All the refrigerant discharged by the compressor flows into the refrigerant branch. The heat of the refrigerant flowing into the refrigerant branch is stored in the energy storage device when it flows through the energy storage device. A part of the refrigerant flowing out of the refrigerant branch flows through the throttling device and the outdoor heat exchanger 3 in sequence and then flows back to the compressor. Another part of the refrigerant flowing out of the refrigerant branch flows through the second control valve and the indoor heat exchanger 21 in sequence and then flows back to the compressor. In the third mode, the indoor heat exchanger and the outdoor heat exchanger 3 are both in an evaporating state. In the third mode, the indoor space regulated by the indoor unit has a cooling demand, and the indoor fan in the indoor unit is turned on to drive the indoor air to exchange heat with the indoor heat exchanger. In the third mode, the heat absorbed by the indoor heat exchanger and the outdoor heat exchanger from their environment can be stored in the energy storage device. In the third mode, the indoor environment can be cooled and the energy storage device can store heat at the same time.

[0155] When the second preset mode is the fourth mode, the first reversing valve operates at the first valve position, the second reversing valve operates at the third valve position, the first control valve is closed, and the second control valve is opened. The refrigerant discharged from the compressor flows through the outdoor heat exchanger, the throttling device, the second control valve, and the indoor heat exchanger in sequence and then flows back to the compressor. In the fourth mode, the indoor heat exchanger is in an evaporating state and the outdoor heat exchanger is in a condensing state. In the fourth mode, the indoor space regulated by the indoor unit has a cooling demand, and the indoor fan in the indoor unit can be turned on to drive the indoor air to exchange heat with the indoor heat exchanger. In the fourth mode, the indoor environment can be cooled while the energy storage device stops storing heat.

[0156] In other embodiments, the reversing assembly may also include a third four-way valve, through the regulation of the third four-way valve, the indoor heat exchanger is connected to the return air port of the compressor, and the outdoor heat exchanger is connected to the exhaust port of the compressor, thereby realizing the preset operation mode of the heat pump system.

[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 comprises a refrigerant main circuit and a refrigerant branch circuit, the refrigerant main circuit comprises an indoor heat exchanger, an outdoor heat exchanger and a compressor, the refrigerant branch circuit comprises an energy storage device and a first control valve, and the control method of the heat pump system comprises the following steps: When the heat pump system is in a preset mode, controlling the first control valve to operate at a preset opening corresponding to the preset mode, in which the indoor heat exchanger is in an evaporating state and the refrigerant branch is connected to the exhaust port of the compressor; Acquiring a first temperature of an energy storage medium in the energy storage device; When the first temperature meets a first preset condition, the first control valve is controlled to reduce its opening degree, and the first preset condition includes that the first temperature is greater than a first temperature threshold corresponding to the preset mode.

2. The control method of the heat pump system according to claim 1, characterized in that: After the step of controlling the first control valve to reduce the opening degree when the first temperature meets the first preset condition, the method further includes: Acquiring a second temperature of the energy storage medium in the energy storage device; When the second temperature meets a second preset condition, controlling the first control valve to operate at the preset opening; The second preset condition includes that the second temperature is lower than a second temperature threshold corresponding to the preset mode, and the second temperature threshold is lower than the first temperature threshold.

3. The control method of the heat pump system according to claim 1 or 2, characterized in that: After the step of controlling the first control valve to reduce the opening degree when the first temperature meets the first preset condition, the method further includes: Acquiring a second temperature of the energy storage medium in the energy storage device; When the second temperature meets a third preset condition, controlling the first control valve to maintain a current opening; The third preset condition includes that the second temperature is greater than or equal to a second temperature threshold, and the second temperature is less than or equal to the first temperature threshold, and the second temperature threshold is less than the first temperature threshold.

4. The control method of the heat pump system according to claim 2, characterized in that: The step of controlling the first control valve to operate at a preset opening corresponding to the preset mode comprises: When the preset mode is the first preset mode, controlling the first control valve to operate at a first preset opening; When the preset mode is the second preset mode, controlling the first control valve to operate at a minimum opening; The energy storage device corresponding to the first preset mode is in an energy storage state, the energy storage device corresponding to the second preset mode is in a stopped energy storage state, and the first preset opening is greater than the minimum opening.

5. 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: When the preset mode is the first preset mode, obtaining a current condensing pressure of the heat pump system; The first temperature threshold and / or the second temperature threshold is determined according to the saturation temperature corresponding to the condensation pressure.

6. The control method of the heat pump system according to claim 5, characterized in that: The step of determining the first temperature threshold and / or the second temperature threshold according to the saturation temperature corresponding to the condensing pressure comprises: reducing the saturation temperature according to a first preset value to obtain the first temperature threshold; reducing the saturation temperature according to a second preset value to obtain the second temperature threshold; Wherein, the second preset value is greater than the first preset value.

7. 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: When the preset mode is the second preset mode, the protection temperature of the energy storage device is determined to be the first temperature threshold.

8. The control method of a heat pump system according to any one of claims 1 to 7, characterized in that: Before the step of controlling the first control valve to operate at a preset opening corresponding to the preset mode when the heat pump system is in the preset mode, the step further includes: Acquiring a third temperature of the energy storage medium in the energy storage device; When the third temperature is lower than the target medium temperature, determining the first preset mode as the preset mode; When the third temperature is greater than or equal to the target medium temperature, determining the second preset mode as the preset mode; The energy storage device corresponding to the first preset mode is in an energy storage state, the energy storage device corresponding to the second preset mode is in a stopped energy storage state, and the preset opening corresponding to the first preset mode is greater than the preset opening corresponding to the second preset mode.

9. The control method of a heat pump system according to any one of claims 1 to 7, characterized in that: The refrigerant main circuit further includes a reversing assembly, the reversing assembly includes a first reversing valve and a second reversing valve, one end of the refrigerant branch is communicated with the exhaust port of the compressor, and the pipeline between the indoor unit and the outdoor heat exchanger is communicated with the other end of the refrigerant branch. Before the step of controlling the first control valve to operate at a preset opening corresponding to the preset mode, the step further includes: Controlling the first reversing valve to operate at a first valve position, and controlling the second reversing valve to operate at a third valve position, so that the heat pump system starts the preset mode; Or, controlling the first reversing valve to operate at a first valve position, and controlling the second reversing valve to operate at a fourth valve position, so that the heat pump system starts the preset mode; Wherein, under the first valve position, the return air port of the compressor is connected to the indoor heat exchanger, and the exhaust port of the compressor is blocked from the indoor heat exchanger, under the third valve position, the exhaust port of the compressor is connected to the outdoor heat exchanger, and the return air port of the compressor is blocked from the outdoor heat exchanger, and under the fourth valve position, the exhaust port of the compressor is blocked from the outdoor heat exchanger, and the return air port of the compressor is connected to the outdoor heat exchanger.

10. A heat pump system, characterized in that: The heat pump system comprises a control device, a refrigerant main circuit and a refrigerant branch circuit, wherein the refrigerant main circuit comprises an indoor heat exchanger, an outdoor heat exchanger and a compressor, and the refrigerant branch circuit comprises an energy storage device and a first control valve; The compressor and the first control device are both 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 9 when executed by the processor.

11. 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 9 are implemented.

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