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 main refrigerant path and a branch refrigerant path, the main refrigerant path comprises an indoor unit and an outdoor heat exchanger, the indoor unit comprises an indoor heat exchanger and a first control valve, and the branch refrigerant path comprises an energy storage device and a second control valve. The first control valve is controlled to operate at the opening degree smaller than the first preset opening degree, the second control valve is controlled to operate at the opening degree larger than the second preset opening degree, and the high-pressure temperature of the heat pump system is obtained; determining a target rotating speed of an outdoor fan corresponding to the outdoor heat exchanger according to the high-pressure temperature; controlling the outdoor fan to operate according to the target rotating speed; wherein the preset operation state comprises the fact that the indoor unit is in the refrigeration state and in the preset air feeling mode, and the air outlet speed, corresponding to the preset air feeling mode, of the indoor unit is smaller than the preset air speed. The invention aims to reduce the condensation risk of the indoor unit and improve the operation stability of the system.

Description

Technical Field

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

[0002] Some heat pump systems are equipped with energy storage devices such as water tanks. During the cooling or heating process, part of the refrigerant's energy in the system can be stored in the energy storage device.

[0003] However, when the indoor unit of the heat pump system is turned on to a weak wind mode such as no wind, even if the refrigerant control valve of the indoor unit is operated at the minimum opening, the cooling capacity input to the indoor unit is still too large, and condensation is likely to occur at the air outlet of the indoor unit, affecting the normal operation of the system. 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 condensation risk of an indoor unit and improve the stability of system operation.

[0005] To achieve the above object, the present invention provides a control method for a heat pump system, the heat pump system comprising a refrigerant main circuit and a refrigerant branch circuit connected to the refrigerant main circuit, the refrigerant main circuit comprising an indoor unit and an outdoor heat exchanger, the indoor unit comprising an indoor heat exchanger and a first control valve, the refrigerant branch circuit comprising an energy storage device and a second control valve, the control method for the heat pump system comprising the following steps:

[0006] When the heat pump system is in a preset operating state, the first control valve is controlled to operate at an opening less than a first preset opening, the second control valve is controlled to operate at an opening greater than a second preset opening, and a high-pressure temperature of the heat pump system is obtained;

[0007] Determining a target speed of an outdoor fan corresponding to the outdoor heat exchanger according to the high pressure temperature;

[0008] Controlling the operation of the outdoor fan according to the target speed;

[0009] The preset operating state includes that the indoor unit is in a cooling state and in a preset wind sensing mode, and the air outlet wind speed of the indoor unit corresponding to the preset wind sensing mode is less than the preset wind speed.

[0010] Optionally, the step of determining a target speed of an outdoor fan of the heat pump system according to the high-pressure temperature includes:

[0011] The target rotation speed is determined according to the high pressure temperature and the current rotation speed of the outdoor fan.

[0012] Optionally, the step of determining the target speed according to the high pressure temperature and the current speed of the outdoor fan includes:

[0013] When the high-pressure temperature is less than a first temperature threshold, reducing the current rotation speed of the outdoor fan to obtain the target rotation speed;

[0014] When the high-pressure temperature is greater than or equal to the first temperature threshold and less than or equal to the second temperature threshold, determining that the current speed of the outdoor fan is the target speed;

[0015] When the high-pressure temperature is greater than a second temperature threshold, determining that the current speed of the outdoor fan is the target speed, or increasing the current speed of the outdoor fan to obtain the target speed;

[0016] The first temperature threshold is lower than the second temperature threshold.

[0017] Optionally, the step of reducing the current rotation speed of the outdoor fan to obtain the target rotation speed includes:

[0018] determining a first temperature difference between the high pressure temperature and the first temperature threshold;

[0019] reducing the current rotation speed of the outdoor fan according to the first temperature difference value to obtain the target rotation speed;

[0020] And / or, the step of increasing the current speed of the outdoor fan to obtain the target speed includes:

[0021] determining a second temperature difference between the high pressure temperature and the second temperature threshold;

[0022] The current rotation speed of the outdoor fan is increased according to the second temperature difference value to obtain the target rotation speed.

[0023] Optionally, when the high-pressure temperature is greater than a second temperature threshold, determining the current speed of the outdoor fan as the target speed, or increasing the current speed of the outdoor fan to obtain the target speed comprises:

[0024] When the high-pressure temperature is greater than a second temperature threshold and the second temperature of the energy storage device is less than a set temperature of the energy storage device, executing the step of determining that the current speed of the outdoor fan is the target speed;

[0025] When the high-pressure temperature is greater than a second temperature threshold and the second temperature of the energy storage device is greater than or equal to a set temperature of the energy storage device, the step of increasing the current rotation speed of the outdoor fan to obtain the target rotation speed is performed.

[0026] Optionally, before the step of determining the target speed according to the high-pressure temperature and the current speed of the outdoor fan, the step further includes:

[0027] When the second temperature of the energy storage device is lower than the set temperature of the energy storage device, the first temperature threshold and the second temperature threshold are determined according to the second temperature.

[0028] Optionally, the step of determining the first temperature threshold and the second temperature threshold according to the second temperature includes:

[0029] By increasing the second temperature according to the first adjustment value, a first candidate threshold is obtained, and when the first candidate threshold is within a first preset interval, the first candidate threshold is determined to be the first temperature threshold;

[0030] Increasing the second temperature according to the second adjustment value to obtain a second candidate threshold value, and when the second candidate threshold value is within a second preset interval, determining the second candidate threshold value as the second temperature threshold value;

[0031] The first adjustment value is smaller than the second adjustment value.

[0032] Optionally, the step of determining a target speed of an outdoor fan of the heat pump system according to the high-pressure temperature includes:

[0033] When the high pressure temperature is greater than or equal to a first preset temperature, determining a maximum preset speed as the target speed;

[0034] When the high pressure temperature is less than or equal to a second preset temperature, determining a minimum preset speed as the target speed;

[0035] When the high-pressure temperature is greater than the second preset temperature and less than the first preset temperature, performing the step of determining the target speed according to the high-pressure temperature and the current speed of the outdoor fan;

[0036] Wherein, the first preset temperature is greater than the second preset temperature.

[0037] Optionally, the heat pump system further includes a third control valve disposed between the first control valve and the outdoor heat exchanger, and the control method of the heat pump system further includes:

[0038] When the heat pump system is in the preset operating state, obtaining a second temperature of the energy storage device;

[0039] determining a target opening of the third control valve according to the second temperature;

[0040] The third control valve is controlled to operate at the target opening, and the steps of controlling the first control valve to operate at an opening less than a first preset opening, controlling the second control valve to operate at an opening greater than a second preset opening, and obtaining the high-pressure temperature of the heat pump system are executed.

[0041] Optionally, the step of determining the target opening of the third control valve according to the second temperature includes:

[0042] When the second temperature is lower than the set temperature of the energy storage device, determining a third preset opening as the target opening;

[0043] When the second temperature is greater than or equal to the set temperature, the third preset opening degree is reduced according to the current energy demand state value of the heat pump system to obtain the target opening degree.

[0044] Optionally, the preset opening is a maximum opening;

[0045] And / or, the heat pump system includes at least two indoor units, and before the step of reducing the third preset opening according to the current energy demand state value of the heat pump system to obtain the target opening, the step further includes:

[0046] When the second temperature is greater than or equal to the set temperature, the number of indoor units currently having energy demand among the at least two indoor units is obtained, and the energy demand state value includes the number.

[0047] Optionally, the control method of the heat pump system further includes:

[0048] When the heat pump system is in the preset operating state, obtaining a first temperature of the indoor heat exchanger;

[0049] When the first temperature is lower than the indoor dew point temperature corresponding to the indoor unit, the steps of controlling the first control valve to operate at an opening less than a first preset opening, controlling the second control valve to operate at an opening greater than a second preset opening, and obtaining the high-pressure temperature of the heat pump system are executed.

[0050] Optionally, before the step of controlling the first control valve to operate at an opening less than a first preset opening, controlling the second control valve to operate at an opening greater than a second preset opening, and obtaining the high-pressure temperature of the heat pump system when the heat pump system is in a preset operating state, the method further includes:

[0051] When the heat pump system is started, obtaining the outdoor ambient temperature;

[0052] Determining an initial rotation speed of the outdoor fan according to the outdoor ambient temperature;

[0053] The outdoor ambient temperature is positively correlated with the initial rotation speed.

[0054] Optionally, the step of obtaining the high pressure temperature of the heat pump system comprises:

[0055] Obtaining the high pressure in the refrigerant inflow direction of the indoor unit;

[0056] The saturation temperature corresponding to the high pressure is determined as the high pressure temperature.

[0057] 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 connected to the refrigerant main circuit, the refrigerant main circuit includes an indoor unit and an outdoor heat exchanger, the indoor unit includes an indoor heat exchanger and a first control valve, and the refrigerant branch circuit includes an energy storage device and a second control valve;

[0058] The first control valve and the second control valve 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, wherein the control program for the heat pump system implements the steps of the control method for the heat pump system as described in any one of the above items when executed by the processor.

[0059] 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.

[0060] The present invention proposes a control method for a heat pump system. When the indoor unit on the refrigerant main circuit of the heat pump system is in cooling operation and the corresponding air outlet wind speed is less than a preset wind speed, the method controls the first control valve in the indoor unit to operate with an opening less than a first preset opening and controls the second control valve on the refrigerant branch circuit where an energy storage device is located to operate with an opening greater than a second preset opening. Based on this, the amount of refrigerant flowing through the refrigerant branch circuit can be effectively increased, thereby reducing the amount of refrigerant participating in the refrigeration cycle in the refrigerant main circuit. On this basis, the speed of the outdoor fan corresponding to the outdoor heat exchanger on the refrigerant main circuit is controlled to adapt to the high-pressure temperature of the heat pump system. The overall cooling capacity of the system is limited by controlling the speed of the outdoor fan, thereby reducing the cooling capacity output by the indoor unit, increasing the air outlet temperature of the indoor air outlet, effectively reducing the condensation risk of the indoor unit, and improving the stability of the system operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] Figure 1 A schematic diagram of the hardware structure involved in the operation of an embodiment of a heat pump system of the present invention;

[0062] Figure 2A schematic flow chart of an embodiment of a control method for a heat pump system of the present invention;

[0063] Figure 3 A schematic flow chart of another embodiment of a control method for a heat pump system of the present invention;

[0064] Figure 4 A schematic flow chart of another embodiment of a control method for a heat pump system of the present invention;

[0065] Figure 5 This is a flow chart of another embodiment of a control method for a heat pump system of the present invention.

[0066] 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

[0067] 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.

[0068] An embodiment of the present invention provides a heat pump system.

[0069] In the embodiment of the present invention, refer to Figure 1 and Figure 2 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 an outdoor heat exchanger 4, the indoor unit includes an indoor heat exchanger 9 and a first control valve 7, and the refrigerant branch circuit includes an energy storage device 10 and a second control valve 8. The first control valve 7 and the second control valve 8 are both connected to the control device 100.

[0070] The first end of the refrigerant branch is connected to the exhaust port of the compressor 1 on the refrigerant main circuit or the return air port of the compressor 1, and the pipeline between the outdoor heat exchanger 4 and the indoor heat exchanger 9 is connected to the second end of the refrigerant branch. In this embodiment, the first end of the refrigerant branch is connected to the exhaust port of the compressor 1 on the refrigerant main circuit, and the pipeline between the throttling device and the first control valve 7 is connected to the second end of the refrigerant branch.

[0071] In this embodiment, the first control valve 7 and the second control valve 8 are both electronic expansion valves. In other embodiments, the first control valve 7 and / or the second control valve 8 may also be other types of flow-adjustable fluid components.

[0072] The energy storage device 10 is loaded with energy storage materials. When the refrigerant in the refrigerant branch flows through the energy storage device 10, the energy storage materials absorb the heat or cold of the refrigerant and store it. In this embodiment, the energy storage device 10 is a water tank. In other embodiments, the energy storage device 10 may also be other types of devices made of energy storage materials with energy storage functions, such as a device loaded with molten salt.

[0073] An outdoor fan 5 is provided corresponding to the outdoor heat exchanger 4 , and the outdoor fan 5 can drive the outdoor air to exchange heat with the outdoor heat exchanger 4 .

[0074] The refrigerant main circuit includes a compressor 1, an indoor unit, a throttling device, and an outdoor heat exchanger 4. In this embodiment, the number of indoor units is more than one, and the more than one indoor units are distributed in different indoor spaces, and the more than one indoor units are connected in parallel. In other embodiments, the number of indoor units may also be one. In this embodiment, the throttling device includes a third control valve 6 disposed between the first control valve 7 and the outdoor heat exchanger 4.

[0075] In this embodiment, the refrigerant main circuit also includes a reversing component connected to the control device 100, and the return air port of the compressor 1, the exhaust port of the compressor 1, the indoor heat exchanger 9 and the outdoor heat exchanger 4 are all connected to the reversing component.

[0076] In one implementation of the present embodiment, the reversing assembly includes a first four-way valve 2 and a second four-way valve 3, the exhaust port of the compressor 1, the indoor heat exchanger 9, the return air port of the compressor 1 and the first shut-off piece are respectively connected to different valve ports of the first four-way valve 2, and the exhaust port of the compressor 1, the return air port of the compressor 1, the outdoor heat exchanger 4 and the second shut-off piece are respectively connected to different valve ports of the second four-way valve 3.

[0077] The first four-way valve 2 has a first valve position and a second valve position. In the first valve position, the return air port is connected to the indoor heat exchanger 9 and the exhaust port is connected to the first shut-off member. In the second valve position, the exhaust port is connected to the indoor heat exchanger 9 and the return air port is connected to the first shut-off member.

[0078] The second four-way valve 3 has a third valve position and a fourth valve position. In the third valve position, the return air port is connected to the outdoor heat exchanger 4 and the exhaust port is connected to the second shut-off member. In the fourth valve position, the exhaust port is connected to the outdoor heat exchanger 4 and the return air port is connected to the second shut-off member.

[0079] Through the cooperation of the first four-way valve 2 and the second four-way valve 3, the heat pump system can switch between a variety of different modes:

[0080] In the first mode, the indoor unit is in a cooling state, the energy storage device 10 is in an energy storage state, the first control valve 7 and the second control valve 8 are open, the first control valve 7 and / or the throttling device are throttling, the first four-way valve 2 is operated at the first valve position, the second four-way valve 3 is operated at the fourth valve position, and the refrigerant discharged from the compressor 1 in the refrigerant main circuit flows through the outdoor heat exchanger 4, the throttling device, the first control valve 7, and the indoor heat exchanger 9 in sequence before flowing back to the compressor 1, wherein part of the refrigerant flowing through the refrigerant main circuit can flow through the refrigerant branch circuit and store energy in the energy storage device 10. In the first mode, the indoor heat exchanger 9 is in an evaporating state, and the outdoor heat exchanger 4 is in a condensing state.

[0081] In the second mode, the indoor unit is in a cooling state, the energy storage device 10 is in an energy storage state, the first end of the refrigerant branch is connected to the exhaust port of the compressor 1, the first control valve 7 and the second control valve 8 are opened, the first control valve 7 and the throttling device are in throttling operation, the first four-way valve 2 is operated in the first valve position, and the second four-way valve 3 is operated in the third valve position, the refrigerant discharged from the compressor 1 first flows into the refrigerant branch, and the energy is stored in the energy storage device 10, a part of the refrigerant flowing out of the refrigerant branch flows through the first control valve 7 and the indoor heat exchanger 9 and then flows back to the compressor 1, and another part of the refrigerant flowing out of the refrigerant branch flows through the throttling device and the outdoor heat exchanger 4 and then flows back to the compressor 1. In the second mode, the indoor heat exchanger 9 is in an evaporating state, and the outdoor heat exchanger 4 is in an evaporating state.

[0082] In the third mode, the indoor unit is in a cooling state, the energy storage device 10 is in a stopped energy storage state, the first control valve 7 is open, the second control valve 8 is closed or operates at the minimum opening, the throttling device operates in a throttling manner, the first four-way valve 2 operates in the first valve position, the second four-way valve 3 operates in the fourth valve position, and the refrigerant discharged from the compressor 1 in the refrigerant main circuit flows through the outdoor heat exchanger 4, the throttling device, the first control valve 7, and the indoor heat exchanger 9 in sequence before flowing back to the compressor 1, wherein the energy storage device 10 stops storing energy. In the third mode, the indoor heat exchanger 9 is in an evaporating state, and the outdoor heat exchanger 4 is in a condensing state.

[0083] In the fourth mode, the indoor unit stops heat exchange, the energy storage device 10 is in the energy storage state, the first control valve 7 is closed or operates at the minimum opening, the second control valve 8 is opened, the first four-way valve 2 operates at the first valve position, the second four-way valve 3 operates at the third valve position, and the refrigerant flowing out of the compressor 1 flows through the refrigerant branch, the throttling device, and the outdoor heat exchanger 4 in sequence before flowing back to the compressor 1. In the fourth mode, the outdoor heat exchanger 4 is in the evaporation state.

[0084] In the fifth mode, the indoor unit is in the heating state, the energy storage device 10 is in the energy storage state, the first control valve 7 and the second control valve 8 are open, the first control valve 7 and / or the throttling device are throttling, the first four-way valve 2 is operated in the second valve position, the second four-way valve 3 is operated in the third valve position, and the refrigerant discharged from the compressor 1 flows through the indoor heat exchanger 9, the first control valve 7, the throttling device, and the outdoor heat exchanger 4 in sequence and then flows back to the compressor 1, wherein part of the refrigerant flowing through the refrigerant main circuit can flow through the refrigerant branch circuit and store energy in the energy storage device 10. In the fifth mode, the indoor heat exchanger 9 is in the condensing state, and the outdoor heat exchanger 4 is in the evaporating state.

[0085] In the sixth mode, the indoor unit is in a heating state and the energy storage device 10 is in a stopped energy storage state. The first control valve 7 is opened, the second control valve 8 is closed or operates at the minimum opening, the first control valve 7 and / or the throttling device operates in a throttling manner, the first four-way valve 2 operates in the second valve position, and the second four-way valve 3 operates in the third valve position. The refrigerant discharged from the compressor 1 flows through the indoor heat exchanger 9, the first control valve 7, the throttling device, and the outdoor heat exchanger 4 in sequence and then flows back to the compressor 1, wherein the energy storage device 10 stops storing energy. In the sixth mode, the indoor heat exchanger 9 is in a condensing state, and the outdoor heat exchanger 4 is in an evaporating state.

[0086] In another implementation of this embodiment, the reversing assembly includes a third four-way valve, and the exhaust port of the compressor 1, the return air port of the compressor 1, the indoor heat exchanger 9 and the outdoor heat exchanger 4 are respectively connected to different valve ports of the third four-way valve.

[0087] In other embodiments, the heat pump system may not include a reversing component, and the exhaust port of the compressor 1 in the main refrigerant circuit, the outdoor heat exchanger 4, the throttling device, the first control valve 7, the indoor heat exchanger 9, and the return air port of the compressor 1 are connected in sequence.

[0088] Further, in this embodiment, referring to Figure 1 and Figure 2 The heat pump system further includes a pressure sensor 11, which is connected to the control device 100. The pressure sensor 11 is disposed between the throttling device and the indoor unit. In this embodiment, the pressure sensor 11 is disposed between the throttling device and the first control valve 7.

[0089] Further, in this embodiment, referring to Figure 1 and Figure 2 The heat pump system further comprises a first temperature sensor 01, which is connected to the control device 100. The first temperature sensor 01 is disposed at the indoor heat exchanger 9 and is used to detect the temperature of the indoor heat exchanger 9.

[0090] Further, in this embodiment, referring to Figure 1 and Figure 2 The heat pump system further includes a second temperature sensor 02, which is connected to the control device 100. The second temperature sensor 02 is disposed in the energy storage device 10, and is used to detect the temperature of the energy storage device 10.

[0091] In the embodiment of the present invention, refer to Figure 2The 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.

[0092] 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.

[0093] like Figure 2 As shown, the memory 1002 as a computer storage medium may include a control program for the heat pump system.

[0094] 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.

[0095] 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.

[0096] 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:

[0097] Step S10, when the heat pump system is in a preset operating state, controlling the first control valve to operate at an opening less than a first preset opening, controlling the second control valve to operate at an opening greater than a second preset opening, and acquiring the high-pressure temperature of the heat pump system; wherein the preset operating state includes the indoor unit being in a cooling state and in a preset wind sense mode, and the air outlet wind speed of the indoor unit corresponding to the preset wind sense mode is less than a preset wind speed;

[0098] The preset wind sense mode may include a no wind sense mode, an anti-direct blowing mode or a soft wind sense mode, etc. When the indoor unit is in a cooling state, the cooling mode or the dehumidification mode, etc., may be turned on for the indoor unit.

[0099] When the heat pump system is in a preset operating state, all indoor units may be in a cooling state and in a preset wind sensing mode; or, when the heat pump system is in a preset operating state, some indoor units may be in a cooling state and in a preset wind sensing mode, while another part of the indoor units may be in a cooling state and not in the preset wind sensing mode, or another part of the indoor units may be in a closed state, or another part of the indoor units may be in an air supply state, etc.

[0100] The first preset opening is greater than the minimum opening allowed for the first control valve to operate. The first preset opening may be 30% of the maximum opening corresponding to the first control valve. In this embodiment, when the heat pump system is in a preset operating state, the first control valve operates at the minimum opening. In other embodiments, when the heat pump system is in a preset operating state, the first control valve may also operate at an opening larger than the minimum opening and smaller than the first preset opening. The opening corresponding to the first control valve may be determined according to the actual operating conditions of the heat pump system, for example, the opening of the first control valve may be determined according to the indoor heat exchanger temperature and the dew point temperature of the indoor environment.

[0101] The second preset opening is less than the maximum opening allowed for the second control valve to operate. The second preset opening may be 70% of the maximum opening corresponding to the second control valve. In this embodiment, when the heat pump system is in a preset operating state, the second control valve operates at the maximum opening. In other embodiments, when the heat pump system is in a preset operating state, the second control valve may also operate at an opening smaller than the maximum opening and larger than the second preset opening. The opening corresponding to the second control valve may be determined according to the actual operating conditions of the heat pump system. For example, the opening of the first control valve may be determined according to the indoor heat exchanger temperature, the dew point temperature of the indoor environment, and the temperature difference between the temperature of the energy storage device and the set temperature.

[0102] When the second control valve is opened, the energy storage device is in an energy storage state.

[0103] In the process that the first control valve is operated at a degree of opening less than the first preset degree and the second control valve is operated at a degree of opening greater than the second preset degree, the high-pressure temperature of the heat pump system is obtained. The high-pressure temperature is a parameter that specifically characterizes the temperature state of the high-pressure side of the heat pump system. In this embodiment, the indoor unit is divided into the side where the refrigerant flows into the indoor unit as the high-pressure side, and the side where the refrigerant flows out of the indoor unit as the low-pressure side. In other embodiments, the compressor can also be divided into the side where the compressor discharges the refrigerant as the high-pressure side, and the side where the refrigerant flows into the compressor as the low-pressure side. The high-pressure temperature can be directly detected by a temperature sensor, or it can be calculated after detecting relevant parameters.

[0104] During the high pressure temperature acquisition process, the outdoor fan is in the on state.

[0105] When the heat pump system is in the preset operating state, the compressor runs at the minimum frequency.

[0106] Step S20, determining a target speed of an outdoor fan corresponding to the outdoor heat exchanger according to the high pressure temperature;

[0107] Different high-pressure temperatures correspond to different target speeds. The target speed is positively correlated with the high-pressure temperature. Specifically, a corresponding relationship between the high-pressure temperature and the target speed can be established in advance, and the corresponding relationship can include a calculation formula, a mapping relationship, etc. Based on the corresponding relationship, the target speed corresponding to the current high-pressure temperature can be determined.

[0108] The corresponding relationship here can be a preset fixed corresponding relationship, or a corresponding relationship determined according to the actual operation of the heat pump system. For example, the first temperature difference between the temperature of the energy storage device and the set temperature can be determined, and the corresponding relationship between the high pressure temperature and the target speed here can be determined according to the first temperature difference. For another example, the second temperature difference between the current temperature of the indoor heat exchanger and the corresponding indoor dew point temperature can be determined, and the corresponding relationship between the high pressure temperature and the target speed here can be determined according to the second temperature difference. For another example, the corresponding relationship between the high pressure temperature and the target speed here can also be determined according to the first temperature difference and the second temperature difference.

[0109] Among them, the temperature range where the high-pressure temperature is located can be determined, and the speed associated with the temperature range can be used as the target speed. Alternatively, the speed adjustment value can be determined according to the high-pressure temperature, and the current speed of the outdoor fan can be adjusted according to the speed adjustment value as the target speed. Alternatively, the target speed calculated in the preset formula can be substituted according to the high-pressure temperature.

[0110] Step S30, controlling the operation of the outdoor fan according to the target speed.

[0111] A control method for a heat pump system is proposed in an embodiment of the present invention. When the indoor unit on the refrigerant main circuit of the heat pump system is in cooling operation and the corresponding air outlet wind speed is less than a preset wind speed, the method controls the first control valve in the indoor unit to operate at an opening less than a first preset opening and controls the second control valve on the refrigerant branch circuit where an energy storage device is located to operate at an opening greater than a second preset opening. Based on this, the amount of refrigerant flowing through the refrigerant branch circuit can be effectively increased, thereby reducing the amount of refrigerant participating in the refrigeration cycle in the refrigerant main circuit. On this basis, the speed of the outdoor fan corresponding to the outdoor heat exchanger on the refrigerant main circuit is controlled to adapt to the high-pressure temperature of the heat pump system. The overall cooling capacity of the system is limited by controlling the speed of the outdoor fan, thereby reducing the cooling capacity output by the indoor unit, increasing the air outlet temperature of the indoor air outlet, effectively reducing the condensation risk of the indoor unit, and improving the stability of the system operation.

[0112] Furthermore, in this embodiment, the step of obtaining the high-pressure temperature of the heat pump system includes: obtaining the high-pressure pressure in the refrigerant inflow direction of the indoor unit; and determining the corresponding saturation temperature as the high-pressure temperature according to the high-pressure pressure.

[0113] The high pressure here can be specifically detected by the above-mentioned pressure sensor. The saturation temperature corresponding to the high pressure is calculated as the high pressure temperature here.

[0114] In this embodiment, obtaining the high-pressure temperature in the above manner is conducive to ensuring that the obtained high-pressure temperature can accurately reflect the cooling capacity of the system and the condensation risk of the indoor unit, so that the high-pressure temperature can accurately control the outdoor fan, thereby reducing the condensation risk of the indoor unit while improving the system energy efficiency.

[0115] Furthermore, based on the above-mentioned embodiment, another embodiment of the control method of the heat pump system of the present application is proposed. In this embodiment, the step of determining the target speed of the outdoor fan of the heat pump system according to the high-pressure temperature includes: determining the target speed according to the high-pressure temperature and the current speed of the outdoor fan. Specifically, a speed adjustment value is determined according to the high-pressure temperature, and the current speed is increased or decreased according to the speed adjustment value to obtain the target speed here. Alternatively, it can be determined whether the current speed needs to be increased or decreased according to the high-pressure temperature. When the current speed needs to be increased or decreased, the corresponding speed adjustment value is determined according to the high-pressure temperature or other operating status parameters of the heat pump system to adjust the current speed to obtain the target speed here.

[0116] In this embodiment, when the high-pressure temperature is less than a first temperature threshold, the current speed of the outdoor fan is reduced to obtain the target speed; when the high-pressure temperature is greater than or equal to the first temperature threshold and less than or equal to the second temperature threshold, the current speed of the outdoor fan is determined to be the target speed; when the high-pressure temperature is greater than the second temperature threshold, the current speed of the outdoor fan is determined to be the target speed, or the current speed of the outdoor fan is increased to obtain the target speed; wherein the first temperature threshold is less than the second temperature threshold.

[0117] The first temperature threshold and the second temperature threshold may be preset fixed values, or may be values ​​determined according to state parameters monitored by the heat pump system.

[0118] When increasing or decreasing the current speed of the outdoor fan here, the current speed can be adjusted according to a preset speed adjustment value to obtain a target speed; or, the current speed can be adjusted according to a speed adjustment value determined by the current state parameters of the heat pump system to obtain a target speed.

[0119] The high-pressure temperature can accurately reflect the condensation risk and energy efficiency of the indoor unit. When the high-pressure temperature is within the temperature range formed by the first temperature threshold and the second temperature threshold as the critical value, the heat exchange effect of the outdoor heat exchanger can improve the energy efficiency of the system operation while minimizing the cooling output of the indoor heat exchanger.

[0120] In order to improve the accuracy of the target speed and ensure that the system can take into account both the operating energy efficiency and the prevention of condensation of the indoor unit, in this embodiment, the first temperature difference between the high pressure temperature and the first temperature threshold is determined; the current speed of the outdoor fan is reduced according to the first temperature difference to obtain the target speed. In addition, in this embodiment, the second temperature difference between the high pressure temperature and the second temperature threshold is determined; the current speed of the outdoor fan is increased according to the second temperature difference to obtain the target speed.

[0121] A first speed adjustment amplitude is determined according to the first temperature difference value, and the current speed of the outdoor fan is reduced according to the first speed adjustment amplitude to obtain a target speed; a second speed adjustment amplitude is determined according to the second temperature difference value, and the current speed of the outdoor fan is increased according to the second speed adjustment amplitude to obtain a target speed. The first speed adjustment amplitude is smaller than the second speed adjustment amplitude.

[0122] For example, the first temperature threshold is K1, the second temperature threshold is K2, the high pressure temperature is Tc, and the current speed is N0. When the current speed is reduced, the speed adjustment value ΔX1=Tc-K1, and the target speed N1=N0+ΔX1 is obtained; when the current speed is increased, the speed adjustment value ΔX2=(Tc-K2)*2 is obtained, and the target speed N2=N0+ΔX2 is obtained.

[0123] In this embodiment, the target speed is determined by combining the high-pressure temperature and the current speed of the outdoor fan, which is conducive to ensuring that the speed control of the outdoor fan can accurately match the current actual operation situation, and ensuring that the outdoor fan can prevent condensation of the indoor unit while improving the system energy efficiency when it is at the target speed. Among them, when the high-pressure temperature is low, it indicates that the indoor heat exchanger has a large output of cold and the risk of condensation of the indoor unit is high. At this time, the cooling capacity of the system is reduced by reducing the speed of the outdoor fan, thereby effectively reducing the risk of condensation of the indoor unit; when the high-pressure temperature is high, it indicates that the risk of condensation of the indoor unit is reduced. At this time, the speed of the outdoor fan is maintained or increased, which is conducive to ensuring that the indoor unit will not condense while improving the system energy efficiency.

[0124] Further, in this embodiment, when the second temperature of the energy storage device is lower than the set temperature of the energy storage device, the first temperature threshold and the second temperature threshold are determined according to the second temperature.

[0125] Different second temperatures correspond to different first temperature thresholds and different second temperature thresholds.

[0126] In this embodiment, the first temperature threshold and the second temperature threshold are both greater than the second temperature. In other embodiments, at least one of the first temperature threshold and the second temperature threshold may also be less than the second temperature.

[0127] In this embodiment, a first alternative threshold is obtained by increasing the second temperature according to a first adjustment value, and when the first alternative threshold is within a first preset interval, the first alternative threshold is determined to be the first temperature threshold; a second alternative threshold is obtained by increasing the second temperature according to a second adjustment value, and when the second alternative threshold is within a second preset interval, the second alternative threshold is determined to be the second temperature threshold; wherein the first adjustment value is less than the second adjustment value.

[0128] The first candidate threshold is the sum of the second temperature and the first adjustment value, and the second candidate threshold is the sum of the second temperature and the second characterization value. For example, the first adjustment value is 15°C, and the second adjustment value is 20°C.

[0129] The minimum critical value of the first preset interval is less than the minimum critical value of the second preset interval, and the maximum critical value of the second preset interval is less than the maximum critical value of the second preset interval. In this embodiment, the first preset interval is [38°C, 53°C5, and the second preset interval is [41°C, 56°C5. In other embodiments, the first preset interval and the second preset interval can also be set to other numerical intervals according to actual conditions.

[0130] Among them, when the first alternative threshold is greater than the maximum critical value of the first preset interval, the maximum critical value of the first preset interval is determined to be the first temperature threshold; when the first alternative threshold is less than the minimum critical value of the first preset interval, the minimum critical value of the first preset interval is determined to be the first temperature threshold. When the second alternative threshold is greater than the maximum critical value of the second preset interval, the maximum critical value of the second preset interval is determined to be the second temperature threshold; when the second alternative threshold is less than the minimum critical value of the second preset interval, the minimum critical value of the second preset interval is determined to be the second temperature threshold.

[0131] In this embodiment, the first temperature threshold and the second temperature threshold are determined according to the second temperature, which is conducive to ensuring the target speed of the indoor fan determined based on the first temperature threshold and the second temperature threshold, and can reduce the risk of condensation in the indoor unit while ensuring that sufficient energy storage energy is provided to the energy storage device, thereby reducing the risk of condensation in the indoor unit while improving the energy storage efficiency of the energy storage device.

[0132] In other embodiments, when the second temperature of the energy storage device is greater than or equal to the set temperature of the energy storage device, the first temperature threshold and the second temperature threshold may be pre-set fixed values, for example, the first temperature threshold is 36°C and the second temperature threshold is 40°C.

[0133] Further, in this embodiment, the step of determining the target speed of the outdoor fan of the heat pump system according to the high pressure temperature includes:

[0134] When the high pressure temperature is greater than or equal to a first preset temperature, determining a maximum preset speed as the target speed;

[0135] When the high pressure temperature is less than or equal to a second preset temperature, determining a minimum preset speed as the target speed;

[0136] When the high-pressure temperature is greater than the second preset temperature and less than the first preset temperature, performing the step of determining the target speed according to the high-pressure temperature and the current speed of the outdoor fan;

[0137] Wherein, the first preset temperature is greater than the second preset temperature.

[0138] The first preset temperature and the second preset temperature are respectively the maximum temperature and the minimum temperature allowed by the preset system reliable high pressure temperature. For example, the first preset temperature is 59°C and the second preset temperature is 20°C.

[0139] The first temperature threshold is greater than the second preset temperature, and the second temperature threshold is less than the first preset temperature. The first preset interval and the second preset interval are both within the temperature range between the second preset temperature and the first preset temperature.

[0140] In this embodiment, the minimum preset speed is 0, that is, when the outdoor fan runs at the target speed, the outdoor fan stops. In other embodiments, the minimum preset speed may also be a speed greater than 0.

[0141] In this embodiment, when the high-pressure temperature is greater than or equal to the first preset temperature, it indicates that the high-pressure temperature is too high. At this time, the maximum preset speed is used as the target speed, thereby improving the heat exchange efficiency of the outdoor condenser, so that the high-pressure temperature is effectively reduced and the system operation reliability is improved; when the high-pressure temperature is less than or equal to the second preset temperature, it indicates that the high-pressure temperature is too low. At this time, the outdoor fan runs at the minimum preset speed, which is conducive to reducing the efficiency of the outdoor condenser, so that the high-pressure temperature is effectively increased and the system operation reliability is improved. When the high-pressure temperature is between the first temperature threshold and the second temperature threshold, the target speed of the outdoor fan is determined based on the high-pressure temperature and the current temperature on the basis of ensuring the reliable operation of the system, thereby achieving an effective balance between reliable system operation, improved energy efficiency and reduced condensation risk of the indoor unit.

[0142] 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. Figure 4 , when the high-pressure temperature is greater than the second temperature threshold, determining the current speed of the outdoor fan as the target speed, or increasing the current speed of the outdoor fan to obtain the target speed comprises:

[0143] Step S21, when the high-pressure temperature is greater than a second temperature threshold and the second temperature of the energy storage device is less than a set temperature of the energy storage device, executing the step of determining that the current speed of the outdoor fan is the target speed;

[0144] Step S22, when the high pressure temperature is greater than the second temperature threshold and the second temperature of the energy storage device is greater than or equal to the set temperature of the energy storage device, the step of increasing the current speed of the outdoor fan to obtain the target speed is executed.

[0145] The execution order of step S21 and step S22 is not specifically limited. The first temperature and the second temperature can be detected before step S20, synchronously with the high pressure temperature, or after the high pressure temperature.

[0146] When the high-pressure temperature is high and the second temperature of the energy storage device has not reached the set temperature, it indicates that the current system requires more energy for energy storage. At this time, the outdoor fan maintains the current speed and does not further increase the speed, which is beneficial to improving the energy storage efficiency of the energy storage device. In addition, not further reducing the speed is conducive to avoiding the impact of excessive high-pressure temperature on system reliability, thereby improving system operation stability.

[0147] When the high-pressure temperature is high and the second temperature of the energy storage device reaches the set temperature, it indicates that the current system requires less energy for energy storage. At this time, increasing the operating speed of the outdoor fan is conducive to ensuring the improvement of system energy efficiency and effectively reducing the risk of system reliability problems, thereby further improving system energy efficiency and operating stability.

[0148] 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 heat pump system further includes a third control valve disposed between the first control valve and the outdoor heat exchanger, referring to Figure 5 , the control method of the heat pump system further includes:

[0149] Step S101, when the heat pump system is in the preset operating state, obtaining a second temperature of the energy storage device;

[0150] The second temperature is specifically obtained by acquiring data detected in real time by a second temperature sensor.

[0151] Step S102, determining a target opening of the third control valve according to the second temperature;

[0152] Different second temperatures correspond to different target openings. The target opening may be negatively correlated with the second temperature.

[0153] Specifically, the target opening degree can be calculated by substituting the second temperature into a preset formula; the target opening degree can also be obtained by looking up a table using the second temperature.

[0154] Step S103, controlling the third control valve to operate at the target opening, and executing the steps of controlling the first control valve to operate at an opening less than a first preset opening, controlling the second control valve to operate at an opening greater than a second preset opening, and obtaining the high-pressure temperature of the heat pump system.

[0155] In this embodiment, the second temperature can accurately reflect the energy storage demand of the energy storage device. Therefore, the operating opening of the third control valve between the indoor and outdoor heat exchangers is adjusted according to the second temperature, which is beneficial to reduce the condensation risk of the indoor unit while meeting the energy storage demand of the energy storage device.

[0156] Furthermore, in this embodiment, when the second temperature is lower than the set temperature of the energy storage device, the third preset opening is determined as the target opening; when the second temperature is greater than or equal to the set temperature, the third preset opening is reduced according to the current energy demand state value of the heat pump system to obtain the target opening.

[0157] In this embodiment, the third preset opening is the maximum opening. In other embodiments, the third preset opening may also be other openings smaller than the maximum opening.

[0158] In this embodiment, the heat pump system includes at least two indoor units, and before the step of reducing the third preset opening according to the current energy demand state value of the heat pump system to obtain the target opening, it also includes: when the second temperature is greater than or equal to the set temperature, obtaining the number of indoor units currently having energy demand among the at least two indoor units, and the energy demand state value includes the number. In other embodiments, the energy demand value of each indoor unit can also be obtained, and the energy demand state value here is calculated based on at least two energy demand values.

[0159] In this embodiment, when the energy storage device is not at temperature, a larger third preset opening is used to control the third control valve, thereby ensuring that the system operation can provide sufficient energy for the actual energy demand of the energy storage device and the indoor unit, reducing the risk of condensation in the indoor unit while meeting the refrigeration and energy storage requirements. When the energy storage device has reached temperature, the opening is reduced according to the actual energy demand of the indoor unit, effectively reducing the refrigeration capacity of the system while reducing the energy provided by the system operation to the energy storage device, thereby reducing the risk of condensation in the indoor unit while ensuring the accurate satisfaction of the energy storage requirements.

[0160] In other embodiments, when the second temperature is greater than or equal to the set temperature, the fourth preset opening degree may also be determined as the target opening degree, and the third preset opening degree is greater than the fourth preset opening degree.

[0161] Further, based on any of the above embodiments, in this embodiment, the control method of the heat pump system also includes: when the heat pump system is in the preset operating state, obtaining the first temperature of the indoor heat exchanger; when the first temperature is lower than the indoor dew point temperature corresponding to the indoor unit, executing the steps of controlling the first control valve to operate with an opening less than a first preset opening, controlling the second control valve to operate with an opening greater than a second preset opening, and obtaining the high-pressure temperature of the heat pump system.

[0162] When there are more than one indoor units in a cooling state and in a preset wind sensing mode, the first temperature of the indoor heat exchanger in each indoor unit can be obtained.

[0163] The indoor dew point temperature corresponding to the indoor unit can be calculated based on the corresponding indoor temperature and indoor humidity.

[0164] Among them, when the heat pump system also includes the above-mentioned third control valve, when the heat pump system is in the preset operating state, the first temperature of the indoor heat exchanger and the second temperature of the energy storage device can be obtained, and when the first temperature is lower than the indoor dew point temperature corresponding to the indoor unit, the third control valve can be controlled to operate according to the target opening corresponding to the second temperature, while the first control valve is controlled to operate with an opening less than the first preset opening, and the second control valve is controlled to operate with an opening greater than the second preset opening, and the high-pressure temperature of the heat pump system can be obtained.

[0165] Among them, the first temperature of the indoor heat exchanger is lower than the dew point temperature, indicating that there is a condensation risk in the indoor unit. On this basis, the high pressure temperature can accurately reflect the condensation risk of the indoor unit.

[0166] In this embodiment, when the heat pump system is in a preset operating state and the first temperature of the indoor heat exchanger is lower than the corresponding indoor dew point temperature, indicating that the indoor unit has a condensation risk, the system is controlled in the manner mentioned in the above embodiment to reduce the condensation risk of the indoor unit, thereby avoiding unnecessary loss of system output capacity, reducing the indoor condensation risk and satisfying the indoor heat exchange demand and the energy storage demand of the energy storage device.

[0167] Further, based on any of the above embodiments, in this embodiment, before step S10, it also includes: when the heat pump system is started, obtaining the outdoor ambient temperature; determining the initial speed of the outdoor fan according to the outdoor ambient temperature; wherein the outdoor ambient temperature is positively correlated with the initial speed. Based on this, it is helpful to ensure that the initial speed of the outdoor fan can accurately match the operating conditions of the heat pump system, and ensure the operating stability and reliability of the heat pump system during the startup phase.

[0168] 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.

[0169] 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.

[0170] 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.

[0171] 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.

[0172] 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 connected to the refrigerant main circuit, the refrigerant main circuit comprises an indoor unit and an outdoor heat exchanger, the indoor unit comprises an indoor heat exchanger and a first control valve, the refrigerant branch circuit comprises an energy storage device and a second control valve, and the control method of the heat pump system comprises the following steps: When the heat pump system is in a preset operating state, the first control valve is controlled to operate at an opening less than a first preset opening, the second control valve is controlled to operate at an opening greater than a second preset opening, and a high-pressure temperature of the heat pump system is obtained; Determining a target speed of an outdoor fan corresponding to the outdoor heat exchanger according to the high pressure temperature; Controlling the operation of the outdoor fan according to the target speed; The preset operating state includes that the indoor unit is in a cooling state and in a preset wind sensing mode, and the air outlet wind speed of the indoor unit corresponding to the preset wind sensing mode is less than the preset wind speed.

2. The control method of the heat pump system according to claim 1, characterized in that: The step of determining the target speed of the outdoor fan of the heat pump system according to the high pressure temperature comprises: The target rotation speed is determined according to the high pressure temperature and the current rotation speed of the outdoor fan.

3. The control method of the heat pump system according to claim 2, characterized in that: The step of determining the target speed according to the high pressure temperature and the current speed of the outdoor fan comprises: When the high-pressure temperature is less than a first temperature threshold, reducing the current rotation speed of the outdoor fan to obtain the target rotation speed; When the high-pressure temperature is greater than or equal to the first temperature threshold and less than or equal to the second temperature threshold, determining that the current speed of the outdoor fan is the target speed; When the high-pressure temperature is greater than a second temperature threshold, determining that the current speed of the outdoor fan is the target speed, or increasing the current speed of the outdoor fan to obtain the target speed; The first temperature threshold is lower than the second temperature threshold.

4. The control method of the heat pump system according to claim 3, characterized in that: The step of reducing the current rotation speed of the outdoor fan to obtain the target rotation speed comprises: determining a first temperature difference between the high pressure temperature and the first temperature threshold; reducing the current rotation speed of the outdoor fan according to the first temperature difference value to obtain the target rotation speed; And / or, the step of increasing the current speed of the outdoor fan to obtain the target speed includes: determining a second temperature difference between the high pressure temperature and the second temperature threshold; The current rotation speed of the outdoor fan is increased according to the second temperature difference value to obtain the target rotation speed.

5. The control method of the heat pump system according to claim 3, characterized in that: The step of determining the current speed of the outdoor fan as the target speed when the high-pressure temperature is greater than the second temperature threshold, or increasing the current speed of the outdoor fan to obtain the target speed includes: When the high-pressure temperature is greater than a second temperature threshold and the second temperature of the energy storage device is less than a set temperature of the energy storage device, executing the step of determining that the current speed of the outdoor fan is the target speed; When the high-pressure temperature is greater than a second temperature threshold and the second temperature of the energy storage device is greater than or equal to a set temperature of the energy storage device, the step of increasing the current rotation speed of the outdoor fan to obtain the target rotation speed is performed.

6. The control method of the heat pump system according to claim 3, characterized in that: Before the step of determining the target speed according to the high pressure temperature and the current speed of the outdoor fan, the method further includes: When the second temperature of the energy storage device is lower than the set temperature of the energy storage device, the first temperature threshold and the second temperature threshold are determined according to the second temperature.

7. The control method of the heat pump system according to claim 3, characterized in that: The step of determining the first temperature threshold and the second temperature threshold according to the second temperature comprises: By increasing the second temperature according to the first adjustment value, a first candidate threshold is obtained, and when the first candidate threshold is within a first preset interval, the first candidate threshold is determined to be the first temperature threshold; Increasing the second temperature according to the second adjustment value to obtain a second candidate threshold value, and when the second candidate threshold value is within a second preset interval, determining the second candidate threshold value as the second temperature threshold value; The first adjustment value is smaller than the second adjustment value.

8. The control method of the heat pump system according to claim 2, characterized in that: The step of determining the target speed of the outdoor fan of the heat pump system according to the high pressure temperature comprises: When the high pressure temperature is greater than or equal to a first preset temperature, determining a maximum preset speed as the target speed; When the high pressure temperature is less than or equal to a second preset temperature, determining a minimum preset speed as the target speed; When the high-pressure temperature is greater than the second preset temperature and less than the first preset temperature, performing the step of determining the target speed according to the high-pressure temperature and the current speed of the outdoor fan; Wherein, the first preset temperature is greater than the second preset temperature.

9. The control method of a heat pump system according to any one of claims 1 to 8, characterized in that: The heat pump system further includes a third control valve disposed between the first control valve and the outdoor heat exchanger, and the control method of the heat pump system further includes: When the heat pump system is in the preset operating state, obtaining a second temperature of the energy storage device; determining a target opening of the third control valve according to the second temperature; The third control valve is controlled to operate at the target opening, and the steps of controlling the first control valve to operate at an opening less than a first preset opening, controlling the second control valve to operate at an opening greater than a second preset opening, and obtaining the high-pressure temperature of the heat pump system are executed.

10. The control method of the heat pump system according to claim 9, characterized in that: The step of determining the target opening of the third control valve according to the second temperature comprises: When the second temperature is lower than the set temperature of the energy storage device, determining a third preset opening as the target opening; When the second temperature is greater than or equal to the set temperature, the third preset opening degree is reduced according to the current energy demand state value of the heat pump system to obtain the target opening degree.

11. The control method of the heat pump system according to claim 10, characterized in that: The preset opening is the maximum opening; And / or, the heat pump system includes at least two indoor units, and before the step of reducing the third preset opening according to the current energy demand state value of the heat pump system to obtain the target opening, the step further includes: When the second temperature is greater than or equal to the set temperature, the number of indoor units currently having energy demand among the at least two indoor units is obtained, and the energy demand state value includes the number.

12. The control method of a heat pump system according to any one of claims 1 to 8, characterized in that: The control method of the heat pump system further includes: When the heat pump system is in the preset operating state, obtaining a first temperature of the indoor heat exchanger; When the first temperature is lower than the indoor dew point temperature corresponding to the indoor unit, the steps of controlling the first control valve to operate at an opening less than a first preset opening, controlling the second control valve to operate at an opening greater than a second preset opening, and obtaining the high-pressure temperature of the heat pump system are executed.

13. The control method of a heat pump system according to any one of claims 1 to 8, characterized in that: The step of obtaining the high pressure temperature of the heat pump system comprises: Obtaining the high pressure in the refrigerant inflow direction of the indoor unit; The saturation temperature corresponding to the high pressure is determined as the high pressure temperature.

14. The control method of a heat pump system according to any one of claims 1 to 8, characterized in that: Before the step of controlling the first control valve to operate at an opening less than a first preset opening, controlling the second control valve to operate at an opening greater than a second preset opening, and obtaining the high-pressure temperature of the heat pump system when the heat pump system is in a preset operating state, the method further includes: When the heat pump system is started, obtaining the outdoor ambient temperature; Determining an initial rotation speed of the outdoor fan according to the outdoor ambient temperature; The outdoor ambient temperature is positively correlated with the initial rotation speed.

15. A heat pump system, characterized in that: The heat pump system comprises a control device, a refrigerant main circuit and a refrigerant branch circuit connected to the refrigerant main circuit, the refrigerant main circuit comprises an indoor unit and an outdoor heat exchanger, the indoor unit comprises an indoor heat exchanger and a first control valve, and the refrigerant branch circuit comprises an energy storage device and a second control valve; The first control valve and the second control valve 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, wherein the control program for the heat pump system implements the steps of the control method for the heat pump system as described in any one of claims 1 to 14 when executed by the processor.

16. 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 14 are implemented.

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