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

Abstract

The application discloses a kind of control method of heat pump system, heat pump system and storage medium.Therein, heat pump system includes refrigerant main road, refrigerant branch and switching component, refrigerant branch includes energy storage device, throttling device and indoor unit between the pipeline is connected with the first end of refrigerant branch, the second end of refrigerant branch, the exhaust port of compressor and the back gas port of compressor are connected with switching component, this method includes: control reversing component to run with first state to make indoor unit and exhaust port communication and outdoor heat exchanger and back gas port communication, control switching component to run with third state to make the second end of refrigerant branch and exhaust port communication.When heat pump system runs to reach defrosting starting condition, control reversing component to run with second state to make outdoor heat exchanger and exhaust port communication, control switching component to run with fourth state to make the second end of refrigerant branch and back gas port communication.The present application aims to improve the indoor comfort and defrosting efficiency when heat pump system defrosting runs.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat pump system, in particular to a control method of heat pump system, heat pump system and storage medium. BACKGROUND

[0002] In addition to providing energy for indoor environment regulation, the heat pump system can also be provided with an energy storage device to meet other temperature regulation requirements. When the heat pump system is in heating operation, the indoor heat exchanger is in condensing state and the outdoor heat exchanger is in evaporating state. When the outdoor environment temperature is low, the outdoor heat exchanger will frost and the heat pump system needs to be switched to defrosting operation.

[0003] However, when the heat pump system is in defrosting operation, the outdoor heat exchanger is in condensing state and the indoor heat exchanger needs to be switched to evaporating state to absorb heat. However, this easily causes indoor temperature fluctuation, affecting indoor comfort during defrosting process. SUMMARY

[0004] The main purpose of the present application is to provide a control method of heat pump system, heat pump system and storage medium, aiming to improve indoor comfort and defrosting efficiency when the heat pump system is in defrosting operation.

[0005] To achieve the above-mentioned purpose, the present application provides a control method of heat pump system, the heat pump system comprising a refrigerant main circuit, a refrigerant branch circuit and a switching assembly, the refrigerant main circuit comprising an indoor unit, a throttling device, an outdoor heat exchanger, a reversing assembly and a compressor, the indoor unit, the throttling device and the outdoor heat exchanger being connected in sequence, the refrigerant branch circuit comprising an energy storage device, the pipeline between the throttling device and the indoor unit being connected with the first end of the refrigerant branch circuit, the second end of the refrigerant branch circuit, the exhaust port of the compressor and the gas return port of the compressor all being connected with the switching assembly, the control method of the heat pump system comprising the following steps:

[0006] controlling the reversing assembly to operate in a first state to make the indoor unit communicate with the exhaust port and the outdoor heat exchanger communicate with the gas return port, and controlling the switching assembly to operate in a third state to make the second end of the refrigerant branch circuit communicate with the exhaust port;

[0007] when the heat pump system operates to reach defrosting start condition, controlling the reversing assembly to operate in a second state to make the outdoor heat exchanger communicate with the exhaust port, and controlling the switching assembly to operate in a fourth state to make the second end of the refrigerant branch circuit communicate with the gas return port.

[0008] Optionally, during the execution of the step of controlling the reversing assembly to operate in a second state to make the outdoor heat exchanger communicate with the exhaust port, and controlling the switching assembly to operate in a fourth state to make the second end of the refrigerant branch circuit communicate with the gas return port, the method further comprises:

[0009] The compressor is controlled to operate based on the energy demand parameters of the energy storage device and / or the pressure characteristics of the heat pump system that characterize the system pressure.

[0010] Optionally, the step of controlling the compressor operation based on the pressure characteristics of the heat pump system representing the system pressure includes:

[0011] When the pressure characteristic is less than or equal to the preset pressure characteristic, the compressor is controlled to operate based on the pressure characteristic and the target pressure characteristic.

[0012] When the pressure characteristic is greater than the preset pressure characteristic, the compressor is restricted to operate at a higher frequency, or the compressor is controlled to operate at a lower frequency, or the compressor is controlled to stop.

[0013] Optionally, the step of controlling the compressor operation based on the pressure characteristics and the target pressure characteristics includes:

[0014] Determine the pressure feature difference between the pressure feature and the target pressure feature;

[0015] When the pressure characteristic difference is greater than a first preset threshold, the compressor is controlled to operate at a reduced frequency.

[0016] When the pressure characteristic difference is less than or equal to the second preset threshold, the compressor is controlled to operate at a higher frequency.

[0017] Wherein, the second preset threshold is less than or equal to the first preset threshold.

[0018] Optionally, the steps of limiting the compressor to operate at a higher frequency, controlling the compressor to operate at a lower frequency, or controlling the compressor to shut down include:

[0019] When the pressure characteristic is less than or equal to the first pressure characteristic threshold, the step of limiting the compressor to operate at higher frequencies is executed;

[0020] When the pressure characteristic is greater than the first pressure characteristic threshold and less than or equal to the second pressure characteristic threshold, the step of controlling the compressor to operate at a reduced frequency is executed.

[0021] When the pressure characteristic exceeds the second pressure characteristic threshold, the compressor shutdown step is executed;

[0022] Wherein, the first pressure feature threshold is greater than the preset pressure feature, and the second pressure feature threshold is greater than the first pressure feature threshold.

[0023] Optionally, the step of limiting the compressor to operate at an increased frequency includes:

[0024] When the pressure characteristic is less than or equal to the third pressure characteristic threshold, the compressor is controlled to operate at a rate lower than the preset rate.

[0025] When the pressure characteristic is greater than the third pressure characteristic threshold and the pressure characteristic is less than or equal to the first pressure characteristic threshold, the compressor is controlled to maintain the current frequency of operation.

[0026] Wherein, the third pressure feature threshold is greater than the preset pressure feature, and the third pressure feature threshold is less than the first pressure feature threshold.

[0027] Optionally, the step of controlling the compressor to operate at a reduced frequency includes:

[0028] The frequency adjustment value is determined based on the pressure characteristics;

[0029] The compressor is controlled to reduce its current operating frequency according to the frequency adjustment value;

[0030] The frequency adjustment value is positively correlated with the pressure characteristic.

[0031] Optionally, the step of controlling the compressor operation according to the energy demand parameters of the energy storage device includes:

[0032] The energy requirement parameter is adjusted according to the target correction value to obtain the target frequency of the compressor;

[0033] Control the compressor to operate at the target frequency;

[0034] The target correction value is determined based on the exhaust parameters of the compressor.

[0035] Optionally, before the step of controlling the compressor operation based on the energy demand parameters of the energy storage device and / or the pressure characteristics of the heat pump system representing the system pressure, the method further includes:

[0036] During the operation of the commutation component in the second state and the operation of the switching component in the fourth state, the actual energy demand of the energy storage device under the current operating conditions and the rated energy demand of the energy storage device are obtained.

[0037] The energy demand parameter is determined based on the actual energy demand and the rated energy demand.

[0038] Optionally, the step of obtaining the actual energy demand of the energy storage device under the current operating conditions includes:

[0039] Obtain the energy storage temperature of the energy storage device and the corresponding outdoor ambient temperature of the heat pump system;

[0040] The actual energy demand is determined based on the energy storage temperature and the outdoor ambient temperature.

[0041] Optionally, the step of obtaining the rated energy demand of the energy storage device includes:

[0042] Obtain the volume of the energy storage device used to store the energy storage material;

[0043] The rated energy requirement is determined based on the volume.

[0044] Optionally, the step of controlling the compressor operation based on the energy demand parameters of the energy storage device and / or the pressure characteristics of the heat pump system representing the system pressure includes:

[0045] The compressor is controlled to operate according to the energy demand parameters;

[0046] When the heat pump system reaches the preset operating conditions, the compressor is controlled to operate according to the pressure characteristics.

[0047] Optionally, the preset conditions include at least one of the following conditions:

[0048] The duration of the commutation component operating in the second state and the switching component operating in the fourth state is greater than a preset duration.

[0049] The pressure characteristic of the heat pump system currently characterizing system pressure is greater than the fourth pressure characteristic threshold.

[0050] Optionally, the control method for the heat pump system further includes:

[0051] During the operation of the commutation component in the second state and the operation of the switching component in the fourth state, the control valve in the indoor unit is controlled to close.

[0052] In addition, to achieve the above objectives, this application also proposes a heat pump system, the heat pump system comprising: a memory, a processor, and a control program for the heat pump system stored in the memory and executable on the processor, wherein when the control program for the heat pump system is executed by the processor, it implements the steps of the control method for the heat pump system as described in any of the preceding claims.

[0053] In addition, to achieve the above objectives, this application also proposes a storage medium storing a control program for a heat pump system, which, when executed by a processor, implements the steps of the control method for the heat pump system as described in any of the preceding claims.

[0054] This invention proposes a control method for a heat pump system. The system utilizes the coordinated operation of a first operating state of the commutation component and a third operating state of the switching component to simultaneously heat the indoor unit and store heat in an energy storage device. When the defrosting start-up conditions are met, the coordinated operation of a second operating state of the commutation component and a fourth operating state of the switching component allows the outdoor heat exchanger to utilize the exhaust heat from the compressor to melt frost. Simultaneously, the refrigerant, after heat exchange in the outdoor heat exchanger and subsequent throttling, flows through the energy storage device to absorb heat and then returns to the compressor. During the defrosting process, the amount of low-temperature refrigerant flowing into the indoor unit is effectively reduced, thus minimizing indoor temperature fluctuations. Furthermore, a significant amount of heat can be absorbed from the energy storage device, effectively improving the defrosting efficiency of the outdoor heat exchanger. Attached Figure Description

[0055] Figure 1 This is a schematic diagram of the refrigerant piping structure of an embodiment of the heat pump system of the present invention and a schematic diagram of the refrigerant flow direction in the first mode;

[0056] Figure 2 This is a schematic diagram of the refrigerant piping structure in one embodiment of the heat pump system of the present invention and a schematic diagram of the refrigerant flow direction in the second mode;

[0057] Figure 3 This is a schematic diagram of the refrigerant piping structure of one embodiment of the heat pump system of the present invention and a schematic diagram of the refrigerant flow direction in the third mode;

[0058] Figure 4 This is a schematic diagram of the hardware structure involved in the operation of an embodiment of the heat pump system of the present invention;

[0059] Figure 5 This is a flowchart illustrating an embodiment of the control method for the heat pump system of the present invention;

[0060] Figure 6 This is a schematic flowchart of another embodiment of the control method for the heat pump system of the present invention;

[0061] Figure 7 This is a flowchart illustrating another embodiment of the control method for the heat pump system of the present invention;

[0062] Figure 8 This is a flowchart illustrating another embodiment of the control method for the heat pump system of the present invention.

[0063] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0064] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0065] This invention provides a heat pump system.

[0066] In this embodiment of the invention, reference is made to Figures 1 to 4 The heat pump system includes a control device 100, a refrigerant main circuit, refrigerant branch circuits, and a switching assembly 9. The refrigerant main circuit includes a compressor 1, an indoor unit, an outdoor heat exchanger 3, a throttling device 4, and a reversing assembly 5, which are connected sequentially. The refrigerant branch circuit includes an energy storage device 7 and a first control valve 8. The indoor unit, the reversing assembly 5, the compressor 1, the throttling device 4, the first control valve 8, and the switching assembly 9 are all connected to the control device 100. The heat pump system also includes an outdoor unit, which includes the aforementioned outdoor heat exchanger 3, throttling device 4, reversing assembly 5, and first control valve 8. The throttling device 4 and the first control valve 8 can be electronic expansion valves.

[0067] 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. When the refrigerant in the refrigerant branch flows through the energy storage device 7, it can exchange heat with the energy storage material therein, and the energy storage material can absorb and store the energy flowing through the refrigerant.

[0068] The piping between the indoor unit and the outdoor heat exchanger 3 is connected to the first end of the refrigerant branch. The return port of the compressor 1, the discharge port of the compressor 1, and the second end of the refrigerant branch are all connected to the switching assembly 9. The refrigerant branch switches between two states: being connected to the return port of the compressor 1 and being connected to the discharge port of the compressor 1, through the switching assembly 9. When the second end of the refrigerant branch is connected to the discharge port of the compressor 1, the energy storage device 7 is in a heat storage state; when the second end of the refrigerant branch is connected to the return port of the compressor 1, the energy storage device 7 is in a cold storage state.

[0069] In this embodiment, there is more than one indoor unit, which can be connected in parallel. Different indoor units are installed in different indoor spaces to regulate the indoor environment of different spaces. In other embodiments, there may be only one indoor unit.

[0070] 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 a control device 100. The second control valve 22 can be an electronic expansion valve. The control device 100 can be used to control the opening degree of the second control valve 22 to regulate the refrigerant flow through the indoor heat exchanger 21. An indoor fan is correspondingly installed in the indoor heat exchanger 21. When the indoor fan is turned on, it drives the air in the corresponding indoor environment to exchange heat with the indoor heat exchanger 21; when the indoor fan is turned off, the air in the corresponding indoor environment stops exchanging heat with the indoor heat exchanger 21.

[0071] The indoor unit, outdoor heat exchanger 3, compressor 1's exhaust port, and compressor 1's return port are all connected to the reversing assembly 5. The reversing assembly 5 can be used to switch the connection status between the indoor unit and outdoor heat exchanger 3 and the compressor 1's exhaust port and compressor 1's return port.

[0072] 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 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 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.

[0073] The first reversing valve 51 has a first valve position and a second valve position. In the first valve position, the return 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 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.

[0074] 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 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 port of the compressor 1 is connected to the outdoor heat exchanger 3.

[0075] In this embodiment, the switching component 9 is a three-way valve. In other embodiments, the switching component 9 may also be a four-way valve or a combination of more than one one-way valves, etc. The switching component 9 has a fifth valve position and a sixth valve position. In the fifth valve position, the exhaust port of the compressor 1 is connected to the second end of the refrigerant branch; in the sixth valve position, the return port of the compressor 1 is connected to the second end of the refrigerant branch.

[0076] Through the adjustment of the first reversing valve 51, the second reversing valve 52, the first control valve 8, and the second control valve 22, the operating modes of the heat pump system include, but are not limited to, the following modes:

[0077] In the first mode, refer to Figure 1The first reversing valve 51 operates in the second valve position, the second reversing valve 52 operates in the fourth valve position, the switching component 9 operates in the fifth valve position, the first control valve 8 is open, the second control valve 22 is open, and a portion of the refrigerant discharged from the compressor 1 flows sequentially through the indoor heat exchanger 21, the second control valve 22, the throttling device 4, and the outdoor heat exchanger 3 before returning to the compressor 1; another portion of the refrigerant discharged from the compressor 1 flows into the refrigerant branch, where heat is stored as the refrigerant flows through the energy storage device 7. The refrigerant flowing out of the refrigerant branch merges with the refrigerant flowing out of the indoor unit, flows sequentially through the throttling device 4 and the outdoor heat exchanger 3, and then returns to the compressor 1. In the first mode, the indoor heat exchanger 21 is in a condensing state, and the outdoor heat exchanger 3 is in an evaporating state. In the first mode, the indoor environment can be heated while the energy storage device 7 stores heat.

[0078] In the second mode, refer to Figure 2 In the first reversing valve 51, the first reversing valve 52 operates in the first valve position; the second reversing valve 52 operates in the third valve position; and the switching component 9 operates in the fifth valve position. The first control valve 8 is closed, and the second control valve 22 is open. The refrigerant discharged from the compressor 1 flows sequentially through the outdoor heat exchanger 3, the throttling device 4, the second control valve 22, and the indoor heat exchanger 21 before returning to the compressor 1. In the second mode, the indoor heat exchanger 21 is in an evaporating state, and the outdoor heat exchanger 3 is in a condensing state. The second mode can either cool the indoor environment or defrost the outdoor heat exchanger 3.

[0079] In the third mode, refer to Figure 3 The first reversing valve 51 operates in the second valve position, the second reversing valve 52 operates in the third valve position, the switching component 9 operates in the sixth valve position, the first control valve 8 is open, and the second control valve 22 is open or closed. The refrigerant discharged from the compressor 1 flows sequentially through the outdoor heat exchanger 3 and the throttling device 4, and then partially or completely flows into the refrigerant branch. When the refrigerant flows through the energy storage device 7, it absorbs the energy in the energy storage device 7 and then flows back to the compressor 1. When the second control valve 22 is open, a portion of the refrigerant flowing out of the throttling device 4 can flow into the indoor heat exchanger 21 and then flow back to the compressor 1. In the third mode, the outdoor heat exchanger 3 can be defrosted or the energy storage device 7 can store cold energy.

[0080] In other embodiments, the reversing assembly 5 may also include a third four-way valve, with the exhaust port of the compressor 1, the return port of the compressor 1, the indoor heat exchanger 21 and the outdoor heat exchanger 3 respectively connected to different ports of the third four-way valve.

[0081] Furthermore, refer to Figure 4 The heat pump system also includes an environmental monitoring module 01, which is used to detect the ambient temperature. The environmental monitoring module 01 is connected to the control device 100. The environmental monitoring module 01 may include an indoor sensor and / or an outdoor sensor. The indoor sensor is located at the return air vent of the indoor unit to detect the indoor temperature, and the outdoor heat exchanger 3 is located on the casing of the outdoor unit to detect the outdoor temperature.

[0082] Furthermore, refer to Figure 4 The heat pump system also includes a temperature detection module 02, which is connected to the control device 100. The temperature detection module 02 can be located inside the energy storage device 7 to detect the temperature of the energy storage device 7.

[0083] Furthermore, refer to Figure 4 The heat pump system also includes a pressure characteristic sensor 03, which is connected to the control device 100 and is used to detect the pressure characteristics of the heat pump system. In this embodiment, the pressure characteristic sensor 03 is located on the exhaust side of the compressor 1 to detect the high-pressure characteristics of the heat pump system. In this embodiment, the pressure characteristic sensor 03 is a temperature sensor used to detect the condensing temperature of the heat pump system, which characterizes the condensing pressure of the system. In other embodiments, the pressure characteristic sensor 03 can be a pressure sensor.

[0084] In this embodiment of the invention, reference is made to Figure 4 The control device 100 of the heat pump system includes a processor 1001, such as a CPU, a memory 1002, and a timer 1003. These components communicate with each other via a communication bus. The memory 1002 can be a high-speed RAM or a stable, non-volatile memory, such as a disk drive. Optionally, the memory 1002 can also be a storage device independent of the aforementioned processor 1001.

[0085] Those skilled in the art will understand that Figure 4 The device structure shown does not constitute a limitation on the device and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0086] like Figure 4 As shown, the memory 1002, which serves as a computer storage medium, may include a control program for a heat pump system.

[0087] exist Figure 4 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 steps of the control method of the heat pump system in the following embodiments.

[0088] This invention also provides a control method for a heat pump system, applied to the aforementioned heat pump system.

[0089] Reference Figure 5 This application proposes an embodiment of a control method for a heat pump system. In this embodiment, the control method for the heat pump system includes:

[0090] Step S10: Control the reversing assembly to operate in a first state to connect the indoor unit with the exhaust port and the outdoor heat exchanger with the return port; control the switching assembly to operate in a third state to connect the second end of the refrigerant branch with the exhaust port.

[0091] In this embodiment, the reversing assembly includes the first and second reversing valves described above. The reversing assembly operates in a first state, including the first reversing valve operating in a second position and the second reversing valve operating in a fourth position, with the heat pump system in the aforementioned first mode. In other embodiments, the reversing assembly includes the third four-way valve described above. The third four-way valve can operate in the heating position to connect the outdoor heat exchanger to the return air port and the exhaust port to the indoor unit.

[0092] In this embodiment, the switching component operating in the third state includes the switching component operating in the aforementioned fifth valve position.

[0093] When the heat pump system includes the aforementioned first control valve and second control valve, both the first control valve and the second control valve are open during the operation of the reversing component in the first state and the operation of the switching component in the third state.

[0094] During the operation of the commutation component in the first state and the switching component in the third state, refer to Figure 1 A portion of the refrigerant discharged from the compressor flows sequentially through the indoor heat exchanger, the second control valve, the throttling device, and the outdoor heat exchanger before returning to the compressor. The remaining refrigerant flows into the refrigerant branch circuit, where heat is stored as it passes through the energy storage device. The refrigerant flowing out of the refrigerant branch circuit merges with the refrigerant flowing out of the indoor unit, flowing sequentially through the throttling device and the outdoor heat exchanger before returning to the compressor. In the first mode, the indoor heat exchanger is in a condensing state, the outdoor heat exchanger is in an evaporating state, and the heat discharged from the compressor is stored in the energy storage device.

[0095] Step S20: When the heat pump system reaches the defrost start-up condition, control the reversing component to operate in the second state so that the outdoor heat exchanger is connected to the exhaust port, and control the switching component to operate in the fourth state so that the second end of the refrigerant branch is connected to the return gas port.

[0096] The defrosting start conditions here specifically refer to the conditions that the operating parameters of the heat pump system itself and / or the environmental parameters of the environment in which the heat pump system is located must meet when the outdoor heat exchanger is in a frosty state and needs to be defrosted. For example, the temperature of the outdoor heat exchanger is less than or equal to a preset temperature and remains so for a preset duration.

[0097] When the heat pump system reaches the defrost start-up conditions, the indoor fan in the indoor unit can be turned on or off. For example, when the exhaust port of the compressor corresponding to the second state is connected to the indoor unit, or when the return port of the compressor corresponding to the second state is connected to the indoor unit and the second control valve is closed, the indoor fan can be turned on; when the return port of the compressor corresponding to the second state is connected to the indoor unit and the second control valve is open, the indoor fan can be turned off.

[0098] In this embodiment, when the reversing assembly operates in the second state, the indoor heat exchanger is connected to the exhaust port. The reversing assembly includes the first reversing valve and the second reversing valve described above. The operation of the reversing assembly in the second state includes the first reversing valve operating in the second valve position and the second reversing valve operating in the fourth valve position, while the heat pump system is in the third mode described above.

[0099] In this embodiment, the switching component operating in the fourth state includes the switching component operating in the sixth valve position described above.

[0100] When the heat pump system includes the aforementioned first and second control valves, during the operation of the reversing assembly in the second state and the switching assembly in the fourth state, the first control valve is open and the second control valve (i.e., the control valve in the indoor unit) is closed. Closing the second control valve helps improve defrosting efficiency.

[0101] During the operation of the reversing assembly in the second state and the switching assembly in the fourth state, the refrigerant discharged from the compressor flows through the outdoor heat exchanger and the throttling device in sequence, and then partially or completely flows into the refrigerant branch. When the refrigerant flows through the energy storage device, it absorbs the energy in the energy storage device and then flows back to the compressor. When the second control valve is opened, a portion of the refrigerant flowing out of the throttling device can flow into the indoor heat exchanger and then flow back to the compressor. The outdoor heat exchanger can use the heat from the compressor exhaust to melt the frost.

[0102] This invention proposes a control method for a heat pump system. The system utilizes the coordinated operation of a first operating state of the commutation component and a third operating state of the switching component to simultaneously heat the indoor unit and store heat in an energy storage device. When the defrosting start condition is met, the coordinated operation of a second operating state of the commutation component and a fourth operating state of the switching component allows the outdoor heat exchanger to utilize the exhaust heat from the compressor to melt frost. Simultaneously, the refrigerant, after heat exchange in the outdoor heat exchanger and subsequent throttling, flows through the energy storage device to absorb heat and then returns to the compressor. During the defrosting process, the amount of low-temperature refrigerant flowing into the indoor unit is effectively reduced, thus minimizing indoor temperature fluctuations. Furthermore, a significant amount of heat can be absorbed from the energy storage device, effectively improving the defrosting efficiency of the outdoor heat exchanger. In addition, the reduced amount of refrigerant flowing into the indoor heat exchanger helps reduce the operating noise of the indoor unit.

[0103] In other embodiments, when the reversing assembly is operating in the second state, the indoor heat exchanger may be connected to the return air port, for example, the first reversing valve described above is operating in the first valve position, and the second reversing valve described above is operating in the fourth valve position.

[0104] In other embodiments, when the reversing assembly is operating in the second state and the indoor heat exchanger is connected to the compressor exhaust port, the second control valve can also be opened and throttled to maintain the supply of heat to the room. The indoor fan operates at the lowest speed, thereby maintaining the supply of heat to the room during the defrosting process, achieving defrosting while improving indoor comfort.

[0105] Furthermore, based on the above embodiments, another embodiment of the control method for the heat pump system of this application is proposed. In this embodiment, reference is made to... Figure 6 The steps of controlling the reversing assembly to operate in the second state to connect the outdoor heat exchanger with the exhaust port, and controlling the switching assembly to operate in the fourth state to connect the second end of the refrigerant branch with the return port, further include:

[0106] Step S30: Control the operation of the compressor according to the energy demand parameters of the energy storage device and / or the pressure characteristics of the heat pump system that characterize the system pressure.

[0107] In this embodiment, the pressure characteristics include high-pressure characteristics that characterize the high-pressure pressure of the system. In other embodiments, the pressure characteristics may also include low-pressure characteristics that characterize the low-pressure pressure of the system.

[0108] Pressure characteristics can be detected by the detection module in the heat pump system, or determined based on the data detected by the detection module in the heat pump system. In this embodiment, pressure characteristics include exhaust temperature, or condensing pressure determined based on exhaust temperature, or exhaust pressure, or saturation temperature corresponding to exhaust pressure, etc.

[0109] Energy demand parameters are state parameters that characterize the amount of heat demanded by the application subject corresponding to the energy storage device. Energy demand parameters can be determined based on monitoring data inside the energy storage device and / or monitoring data of the environment where the heat pump system is located.

[0110] In one implementation of this embodiment, during the operation of the commutation component in the second state and the switching component in the fourth state, the target frequency of the compressor is determined based on energy demand parameters, and the compressor is controlled to operate at the determined target frequency; or, the current frequency of the compressor is adjusted based on the energy demand parameters. In another implementation of this embodiment, during the operation of the commutation component in the second state and the switching component in the fourth state, the target frequency of the compressor is determined based on pressure characteristics, and the compressor is controlled to operate at the determined target frequency; or, the current frequency of the compressor is adjusted based on the pressure characteristics. In yet another implementation of this embodiment, during the operation of the commutation component in the second state and the switching component in the fourth state, the target frequency of the compressor is determined based on both energy demand parameters and pressure characteristics, and the compressor is controlled to operate at the determined target frequency; or, the current frequency of the compressor is adjusted based on both energy demand parameters and pressure characteristics. In yet another implementation of this embodiment, the compressor operating frequency is first controlled based on energy demand parameters, and then controlled based on pressure characteristics; or, the compressor operating frequency is first controlled based on pressure characteristics, and then controlled based on energy demand parameters.

[0111] In this embodiment, the defrosting process is adapted to the energy demand parameters of the energy storage device to control the operating frequency of the compressor, which helps to ensure that the heat of the energy storage device can meet both the defrosting demand and the heat demand of the user during the defrosting process. The defrosting process is adapted to the pressure characteristics to control the operating frequency of the compressor, which helps to ensure that the system pressure can be maintained within a reliable operating range and improve the reliability of the system operation during the defrosting process.

[0112] Furthermore, in this embodiment, the step of controlling the operation of the compressor according to the energy demand parameters of the energy storage device includes: correcting the energy demand parameters according to a target correction value to obtain the target frequency of the compressor; controlling the compressor to operate at the target frequency; wherein the target correction value is determined according to the exhaust parameters of the compressor.

[0113] Exhaust parameters include exhaust pressure and / or exhaust temperature, etc. These parameters can be specifically obtained through a detection module located on the compressor exhaust side or calculated based on the detection data from that module, etc.

[0114] The exhaust parameters can be the current exhaust parameters of the compressor. Alternatively, the exhaust parameters can be determined based on multiple exhaust characteristic parameters of the compressor detected after startup in a preset mode.

[0115] Different exhaust parameters correspond to different target correction values.

[0116] In this embodiment, the target correction value is a correction coefficient, and the product of the energy requirement parameter and the correction coefficient is used as the target frequency. In other embodiments, the target correction value can also be a correction magnitude, and the sum of the energy requirement parameter and the correction magnitude is used as the target frequency.

[0117] In this embodiment, the operating frequency of the compressor is obtained by correcting the energy demand parameters according to the target correction value determined by the compressor's exhaust parameters. This helps to meet the energy demand of the energy storage device during the defrosting process while improving the operating reliability of the compressor.

[0118] Furthermore, in this embodiment, the step of controlling the compressor operation based on the pressure characteristics that characterize the system pressure of the heat pump system includes: when the pressure characteristics are less than or equal to a preset pressure characteristics, controlling the compressor operation based on the pressure characteristics and the target pressure characteristics.

[0119] The preset pressure characteristic is lower than the protection pressure characteristic of the heat pump system. The protection pressure characteristic is a pre-set critical value used to distinguish whether the heat pump system has a risk of reliability problems. The preset pressure characteristic is used to characterize the preset pressure of the heat pump system, and the preset pressure characteristic can be a preset pressure or a preset temperature corresponding to the preset pressure.

[0120] The target pressure characteristic is specifically the pre-set target value that the pressure characteristic needs to reach when energy efficiency is optimal. The target pressure characteristic is used to characterize the target pressure of the heat pump system, and the target pressure characteristic can be the target pressure or the target temperature corresponding to the target pressure.

[0121] In one implementation of this embodiment, a pressure characteristic difference between the pressure characteristic and the target pressure characteristic is determined; the compressor operation is controlled based on the pressure characteristic difference. Specifically, when the pressure characteristic difference is greater than a first preset threshold, the compressor is controlled to operate at a reduced frequency; when the pressure characteristic difference is less than or equal to a second preset threshold, the compressor is controlled to operate at a increased frequency; wherein, the second preset threshold is less than or equal to the first preset threshold. In this embodiment, the pressure characteristic difference is the calculated result obtained by subtracting the target pressure characteristic from the pressure characteristic. If the second preset threshold is less than the first preset threshold, then when the pressure characteristic difference is greater than the second preset threshold and less than or equal to the first preset threshold, the compressor can be controlled to maintain the current frequency operation.

[0122] For example, the pressure characteristic difference X = Tc - Tc_TARGET, where Tc_TARGET is the target pressure characteristic, and Tc is the high-pressure characteristic of the system. In this embodiment, Tc is the condensation temperature. Then:

[0123] When X>1, the compressor frequency decreases by 5% of the current frequency every 20 seconds;

[0124] When -1 < X ≤ 1, the compressor frequency remains at the current frequency;

[0125] When X ≤ -1, the compressor frequency increases by 3% of the current frequency every 20 seconds.

[0126] In another implementation of this embodiment, when the pressure characteristic is greater than the target pressure characteristic, the compressor frequency can be reduced; when the pressure characteristic is less than the target pressure characteristic, the compressor frequency can be increased.

[0127] The frequency adjustment value when the compressor reduces its frequency is greater than the frequency adjustment value when the compressor increases its frequency.

[0128] The frequency adjustment value during the compressor's frequency reduction or increase can be a preset fixed value, or it can be a value determined based on the actual operating conditions of the heat pump system. For example, it can be determined based on the temperature difference between the outdoor heat exchanger temperature and / or the outdoor ambient temperature and / or the energy storage device temperature and the set temperature.

[0129] In this embodiment, when the pressure characteristic is less than or equal to the preset pressure characteristic, the system will not have reliability issues. At this time, the compressor is controlled to operate according to the pressure characteristic and the target pressure characteristic. The operating frequency of the compressor can be increased or decreased to adapt to the actual situation of the pressure characteristic and the target pressure characteristic, so that the pressure characteristic can reach the target pressure characteristic. This improves indoor comfort while enhancing the defrosting process, and effectively improves the system's energy efficiency.

[0130] Furthermore, in this embodiment, the step of controlling the operation of the compressor based on the pressure characteristics of the heat pump system includes: when the pressure characteristics are greater than the preset pressure characteristics, restricting the compressor to operate at a higher frequency, controlling the compressor to operate at a lower frequency, or controlling the compressor to stop.

[0131] Limiting compressor frequency increase operation includes: controlling the compressor to operate at a frequency less than or equal to a preset frequency, or controlling the compressor to maintain the current frequency operation, or controlling the compressor to increase its frequency at a rate less than a preset rate.

[0132] The frequency adjustment value for compressor operation at reduced frequency can be a preset fixed value, or it can be a value determined according to the actual operating conditions of the heat pump system. For example, it can be determined based on the temperature difference between the outdoor heat exchanger temperature and / or the outdoor ambient temperature and / or the energy storage device temperature and the set temperature.

[0133] In this embodiment, when the pressure characteristic is greater than the preset pressure characteristic, the system may experience reliability issues. In this case, limiting the compressor to operate at a higher frequency or controlling the compressor to operate at a lower frequency can prevent the pressure characteristic from being too high and improve the reliability of the defrosting process.

[0134] Furthermore, in this embodiment, a frequency adjustment value is determined based on the pressure characteristic; the compressor is controlled to reduce its current operating frequency according to the frequency adjustment value; wherein, the frequency adjustment value is positively correlated with the pressure characteristic. Specifically, the pressure characteristic range in which the pressure characteristic lies can be determined, and the frequency adjustment value can be determined based on the pressure characteristic range. Alternatively, the frequency adjustment value can be calculated from the pressure characteristic. The larger the pressure characteristic, the greater the frequency reduction of the compressor.

[0135] This approach uses pressure characteristics to determine frequency adjustment values ​​to control the compressor and reduce its current operating frequency, which helps to further improve the reliability of system operation.

[0136] Furthermore, in this embodiment, the step of limiting the compressor to operate at increased frequency or controlling the compressor to operate at decreased frequency includes: when the pressure characteristic is less than or equal to a first pressure characteristic threshold, performing the step of limiting the compressor to operate at increased frequency; when the pressure characteristic is greater than the first pressure characteristic threshold and less than or equal to a second pressure characteristic threshold, performing the step of controlling the compressor to operate at decreased frequency; when the pressure characteristic is greater than the second pressure characteristic threshold, performing the step of stopping the compressor; wherein, the first pressure characteristic threshold is greater than the preset pressure characteristic, and the second pressure characteristic threshold is greater than the first pressure characteristic threshold.

[0137] The second pressure characteristic threshold here is the protection pressure characteristic mentioned above, while the first pressure characteristic threshold is used to distinguish the magnitude of the risk of reliability problems in the heat pump system.

[0138] In this embodiment, when the pressure characteristic is less than or equal to the first pressure characteristic threshold, the probability of reliability problems in the heat pump system is very low. Limiting the compressor frequency increase at this time helps reduce unnecessary compressor frequency reduction or shutdown, effectively ensuring reliable operation while improving defrosting performance. When the pressure characteristic is between the first and second pressure characteristic thresholds, the probability of reliability problems in the heat pump system is relatively high. Running the compressor at a reduced frequency at this time helps reduce compressor shutdown, ensuring reliable system operation while maintaining normal defrosting operation. When the pressure characteristic is greater than the second pressure characteristic threshold, the heat pump system has reliability problems. Shutting down the compressor at this time helps protect the heat pump system.

[0139] Furthermore, in this embodiment, the step of limiting the compressor to operate at a higher frequency includes: when the pressure characteristic is less than or equal to a third pressure characteristic threshold, controlling the compressor to operate at a higher frequency at a rate less than a preset rate; when the pressure characteristic is greater than the third pressure characteristic threshold and the pressure characteristic is less than or equal to the first pressure characteristic threshold, controlling the compressor to maintain the current frequency; wherein, the third pressure characteristic threshold is greater than the preset pressure characteristic, and the third pressure characteristic threshold is less than the first pressure characteristic threshold.

[0140] The preset rate here can be a fixed rate set in advance, or a rate determined according to the actual operating state of the heat pump system. For example, it can be determined according to the temperature difference between the compressor exhaust temperature and / or the outdoor heat exchanger temperature and / or the outdoor ambient temperature and / or the energy storage device temperature and the set temperature.

[0141] In this embodiment, when the pressure characteristic is less than or equal to the third pressure characteristic threshold, the risk of reliability problems is extremely low. Controlling the compressor to meet the frequency increase is beneficial to improving defrosting efficiency while ensuring system operational reliability. When the pressure characteristic is between the third pressure characteristic threshold and the first pressure characteristic threshold, the risk of reliability problems exists but is low. At this time, controlling the compressor to maintain the current frequency operation is beneficial to reducing unavoidable frequency reduction, improving defrosting effect, and ensuring system operational reliability.

[0142] To better understand the heat pump control method mentioned in this embodiment, the following example will be used to illustrate the solution:

[0143] When the system's high-pressure characteristic temperature Tc > 56℃, the following control method shall be used:

[0144] When 56℃<Tc≤58℃, the compressor slowly increases the frequency, increasing by 1Hz every 60 seconds.

[0145] At temperatures between 58℃ and Tc, and below 60℃, the compressor frequency remains constant and cannot be increased.

[0146] If 60℃ < Tc ≤ 62℃, reduce the compressor frequency by 15%.

[0147] When 60℃ < Tc ≤ 64℃, the compressor reduces its current frequency by 30%.

[0148] If Tc > 64℃, the machine will shut down for protection.

[0149] Among them, 56℃ is the preset pressure characteristic mentioned above, 58℃ is the third pressure characteristic threshold mentioned above, 60℃ is the first pressure characteristic threshold mentioned above, and 64℃ is the second pressure characteristic threshold mentioned above.

[0150] Furthermore, based on any of the above embodiments, another embodiment of the control method for the heat pump system of this application is proposed. In this embodiment, reference is made to... Figure 7 Before the step of controlling the compressor operation based on the energy demand parameters of the energy storage device and / or the pressure characteristics of the system pressure of the heat pump system, the method further includes:

[0151] Step S01: During the process of the commutation component operating in the second state and the switching component operating in the fourth state, the actual energy demand of the energy storage device under the current operating conditions and the rated energy demand of the energy storage device are obtained.

[0152] The actual energy demand is related to the actual operating conditions of the energy storage device and can change with the actual operating conditions.

[0153] Rated energy demand is the energy demand value that is related to the inherent properties of the energy storage device and does not change with actual operating conditions.

[0154] Step S02: Determine the energy demand parameter based on the actual energy demand value and the rated energy demand value.

[0155] In this embodiment, the sum of the actual energy demand and the rated energy demand is determined as the energy demand parameter. In other embodiments, the rated energy demand can be used to determine a correction factor, and the actual energy demand can be corrected according to the correction factor to obtain the energy demand parameter.

[0156] In this embodiment, the energy demand parameters of the energy storage device are determined by combining the actual energy demand value and the rated energy demand value. This helps to ensure that the determined energy demand parameters can accurately reflect the capacity requirements of the energy storage device in the initial stage, thereby further improving the accuracy of compressor operating frequency regulation. This further ensures that the energy demand of the energy storage device during the defrosting stage is met while improving defrosting efficiency and indoor comfort.

[0157] In other embodiments, either the actual energy requirement or the rated energy requirement may be used as the energy requirement parameter.

[0158] Furthermore, in this embodiment, the process of obtaining the actual energy demand is as follows: obtaining the energy storage temperature of the energy storage device and the outdoor ambient temperature corresponding to the heat pump system; determining the actual energy demand based on the energy storage temperature and the outdoor ambient temperature.

[0159] The energy storage temperature is detected by the aforementioned temperature sensor. The outdoor ambient temperature is detected by the aforementioned environmental monitoring module.

[0160] Different energy storage temperatures and different outdoor ambient temperatures correspond to different actual energy demands. Actual energy demand is negatively correlated with outdoor ambient temperature, and also negatively correlated with energy storage temperature.

[0161] Specifically, a correspondence between energy storage temperature, outdoor ambient temperature and actual energy demand can be established in advance. This correspondence can include calculation formulas, mapping relationships, etc. Based on this correspondence, the actual energy demand corresponding to the current energy storage temperature and outdoor ambient temperature can be determined.

[0162] Furthermore, there can be more than one pre-set correspondence between energy storage temperature, outdoor ambient temperature and actual energy demand. The target correspondence can be determined from the more than one correspondence based on the operating speed of the outdoor fan corresponding to the outdoor heat exchanger and the temperature difference between the energy storage temperature and the target temperature. Based on the target correspondence, the actual energy demand corresponding to the current energy storage temperature and outdoor ambient temperature can be determined.

[0163] For example, the correspondence between outdoor ambient temperature T4, energy storage temperature Tw, and actual energy demand Aw is shown in Table 1 below:

[0164]

[0165] Table 1

[0166] Based on this, by determining the range of outdoor ambient temperature in the table above and the range of energy storage temperature in the table above, the energy demand value obtained by matching the two ranges is taken as the actual energy demand value.

[0167] In this embodiment, the outdoor ambient temperature and the energy storage temperature can accurately reflect the operating conditions of the defrosting mode. Therefore, determining the actual energy demand value based on the outdoor ambient temperature and the energy storage temperature is beneficial to ensuring that the actual energy demand value can accurately reflect the actual energy demand of the energy storage device under the defrosting condition. This is conducive to further improving the accuracy of compressor frequency operation control, further ensuring that the energy usage demand corresponding to the energy storage device is met, while improving defrosting efficiency and indoor comfort.

[0168] In other embodiments, the actual energy demand can be determined based on either the outdoor ambient temperature or the energy storage temperature, or based on other parameters besides the outdoor ambient temperature and the energy storage temperature. These other parameters may be, for example, the temperature difference between the energy storage temperature and the set temperature of the energy storage device, and / or the temperature change rate of the outdoor heat exchanger, and / or the temperature difference between the inner and outer surface temperatures of the energy storage device, and / or the temperature change rate between the inner and outer surface temperatures of the energy storage device, etc.

[0169] Furthermore, in this embodiment, the volume of the energy storage device used to store the energy storage material is obtained; the rated energy demand is determined based on the volume. The volume and the rated energy demand are positively correlated.

[0170] For example, the volume and rated energy requirement can be shown in Table 2 below:

[0171] Volume / L Rated power requirement Hw / kW 150 2.8 200 3.6

[0172] Table 2

[0173] In this embodiment, the rated energy demand is determined by the volume of the energy storage device, which helps to accurately reflect the energy demand required by the energy storage device itself during the energy storage process. This helps to further improve the accuracy of compressor frequency operation control, and further ensure that the energy usage demand corresponding to the energy storage device is met while improving defrosting efficiency and indoor comfort.

[0174] In other embodiments, the rated energy requirement can also be determined based on factors such as the casing thickness and material type of the energy storage device.

[0175] Furthermore, based on any of the above embodiments, another embodiment of the control method for the heat pump system of this application is proposed. In this embodiment, reference is made to... Figure 8 The step of controlling the compressor operation based on the energy demand parameters of the energy storage device and / or the pressure characteristics of the heat pump system representing the system pressure includes:

[0176] Step S31: Control the compressor to operate according to the energy demand parameters;

[0177] Step S32: When the heat pump system reaches the preset operating conditions, control the compressor to operate according to the pressure characteristics.

[0178] The specific implementation process of controlling compressor operation based on energy demand parameters and controlling compressor operation based on pressure characteristics can be found in the above embodiments, and will not be repeated here.

[0179] The preset conditions are the conditions that the heat pump system's own operating parameters and / or the environmental state parameters of the environment in which the heat pump system is located must meet when the commutation component switches to the second state of operation and the switching component switches to the fourth state of operation and the compressor control mode needs to be switched.

[0180] In this embodiment, the preset conditions include at least one of the following conditions:

[0181] Condition 1: The runtime of the commutation component operating in the second state and the switching component operating in the fourth state is greater than a preset duration;

[0182] Condition 2: The current pressure characteristic representing the system pressure of the heat pump system is greater than the fourth pressure characteristic threshold.

[0183] Condition 1 indicates whether there is a risk of poor energy efficiency after the heat pump system enters defrosting mode, while condition 2 indicates that there is a reliability risk in the heat pump system.

[0184] The fourth pressure characteristic threshold is less than the second pressure characteristic threshold. In this embodiment, the fourth pressure characteristic threshold is equal to the third pressure characteristic threshold. In other embodiments, the fourth pressure characteristic threshold may be greater than or less than the third pressure characteristic threshold.

[0185] In this embodiment, after the heat pump system defrosts, the compressor frequency is controlled according to the energy demand parameters of the energy storage device to reduce the impact on the energy demand of the energy storage device while ensuring indoor comfort during defrosting. When the operation meets the preset conditions, indicating poor defrosting efficiency or a risk of unreliable operation, the compressor operation is further controlled according to the pressure characteristics that characterize the system pressure to improve defrosting efficiency, ensure indoor comfort, and improve the reliability of the heat pump system operation.

[0186] Furthermore, embodiments of the present invention also propose a storage medium storing a control program for a heat pump system. When the control program for the heat pump system is executed by a processor, it implements the relevant steps of any embodiment of the control method for the heat pump system described above.

[0187] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or system. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or system that includes that element.

[0188] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0189] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, heat pump system, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0190] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A control method of a heat pump system, characterized by, The heat pump system comprises a refrigerant main circuit, a refrigerant branch circuit and a switching assembly, the refrigerant main circuit comprises an indoor unit, a throttling device, an outdoor heat exchanger, a reversing assembly and a compressor, the indoor unit, the throttling device and the outdoor heat exchanger are connected in sequence, the refrigerant branch circuit comprises an energy storage device, the pipeline between the throttling device and the indoor unit is connected with the first end of the refrigerant branch circuit, the second end of the refrigerant branch circuit, the exhaust port of the compressor and the gas return port of the compressor are all connected with the switching assembly, and the control method of the heat pump system comprises the following steps: controlling the reversing assembly to operate in a first state to make the indoor unit communicate with the exhaust port and the outdoor heat exchanger communicate with the gas return port, and controlling the switching assembly to operate in a third state to make the second end of the refrigerant branch circuit communicate with the exhaust port; when the heat pump system operates to reach a defrosting starting condition, controlling the reversing assembly to operate in a second state to make the outdoor heat exchanger communicate with the exhaust port, and controlling the switching assembly to operate in a fourth state to make the second end of the refrigerant branch circuit communicate with the gas return port.

2. The control method of a heat pump system according to claim 1, characterized by, During the execution of the step of controlling the reversing assembly to operate in the second state to make the outdoor heat exchanger communicate with the exhaust port and controlling the switching assembly to operate in the fourth state to make the second end of the refrigerant branch circuit communicate with the gas return port, the step further comprises: controlling the compressor to operate according to the energy demand parameter of the energy storage device and / or a pressure characteristic of the system pressure characteristic of the heat pump system.

3. The control method of a heat pump system according to claim 2, characterized by, The step of controlling the compressor to operate according to the pressure characteristic of the system pressure characteristic of the heat pump system comprises: when the pressure characteristic is less than or equal to a preset pressure characteristic, controlling the compressor to operate according to the pressure characteristic and a target pressure characteristic; when the pressure characteristic is greater than the preset pressure characteristic, limiting the compressor to operate in a frequency increasing mode or controlling the compressor to operate in a frequency decreasing mode or controlling the compressor to stop.

4. The control method of a heat pump system according to claim 3, characterized by, The step of controlling the compressor to operate according to the pressure characteristic and the target pressure characteristic comprises: determining a pressure characteristic difference between the pressure characteristic and the target pressure characteristic; when the pressure characteristic difference is greater than a first preset threshold, controlling the compressor to operate in the frequency decreasing mode; when the pressure characteristic difference is less than or equal to a second preset threshold, controlling the compressor to operate in the frequency increasing mode; wherein the second preset threshold is less than or equal to the first preset threshold.

5. The control method of a heat pump system according to claim 3, characterized by, The step of limiting the compressor to operate in the frequency increasing mode or controlling the compressor to operate in the frequency decreasing mode or controlling the compressor to stop comprises: when the pressure characteristic is less than or equal to a first pressure characteristic threshold, executing the step of limiting the compressor to operate in the frequency increasing mode; when the pressure characteristic is greater than the first pressure characteristic threshold and less than or equal to a second pressure characteristic threshold, executing the step of controlling the compressor to operate in the frequency decreasing mode; when the pressure characteristic is greater than the second pressure characteristic threshold, executing the step of controlling the compressor to stop; wherein the first pressure characteristic threshold is greater than the preset pressure characteristic, and the second pressure characteristic threshold is greater than the first pressure characteristic threshold.

6. The control method of a heat pump system according to claim 5, characterized by, The step of limiting the compressor to operate in the frequency increasing mode comprises: control the compressor to operate at a frequency less than a preset frequency when the pressure characteristic is less than or equal to a third pressure characteristic threshold value; control the compressor to maintain a current frequency when the pressure characteristic is greater than the third pressure characteristic threshold value and less than or equal to the first pressure characteristic threshold value; wherein the third pressure characteristic threshold value is greater than the preset pressure characteristic and less than the first pressure characteristic threshold value.

7. The control method of a heat pump system according to claim 5, characterized by, The step of controlling the compressor to operate at a frequency less than a preset frequency when the pressure characteristic is less than or equal to a third pressure characteristic threshold value; determine a frequency adjustment value according to the pressure characteristic; control the compressor to reduce a current operating frequency according to the frequency adjustment value; wherein the frequency adjustment value is positively correlated with the pressure characteristic.

8. The control method of a heat pump system according to claim 2, characterized by, The step of controlling the compressor to operate according to the energy requirement parameter of the energy storage device and / or the pressure characteristic indicative of the system pressure of the heat pump system comprises: correct the energy requirement parameter according to a target correction value to obtain a target frequency of the compressor; control the compressor to operate at the target frequency; wherein the target correction value is determined according to an exhaust parameter of the compressor.

9. The control method of a heat pump system according to claim 2, characterized by, The step of controlling the compressor to operate according to the energy requirement parameter of the energy storage device and / or the pressure characteristic indicative of the system pressure of the heat pump system further comprises: obtain an actual energy requirement value of the energy storage device under a current operating condition and a rated energy requirement value of the energy storage device when the reversing component operates at the second state and the switching component operates at the fourth state; determine the energy requirement parameter according to the actual energy requirement value and the rated energy requirement value.

10. The control method of a heat pump system according to claim 9, characterized by, The step of obtaining the actual energy requirement value of the energy storage device under a current operating condition comprises: obtain a storage temperature of the energy storage device and an outdoor environment temperature corresponding to the heat pump system; determine the actual energy requirement value according to the storage temperature and the outdoor environment temperature.

11. The control method of a heat pump system according to claim 9, characterized by, The step of obtaining the rated energy requirement value of the energy storage device comprises: obtain a volume of the energy storage device for storing energy storage substances; determine the rated energy requirement value according to the volume.

12. The control method of a heat pump system according to any one of claims 2 to 11, characterized by, The step of controlling the compressor to operate according to the energy requirement parameter of the energy storage device and / or the pressure characteristic indicative of the system pressure of the heat pump system comprises: control the compressor to operate according to the energy requirement parameter; control the compressor to operate according to the pressure characteristic when the heat pump system operates reaches a preset condition.

13. The control method of a heat pump system according to claim 12, characterized by, The preset condition comprises at least one of the following conditions: an operating time length of the reversing component operating at the second state and the switching component operating at the fourth state is greater than a preset time length; a pressure characteristic indicative of the system pressure of the heat pump system is greater than a fourth pressure characteristic threshold value.

14. The control method of a heat pump system according to any one of claims 1 to 11, characterized by, The control method of the heat pump system further comprises: control a control valve in the indoor unit to be closed when the reversing component operates at the second state and the switching component operates at the fourth state.

15. A heat pump system, characterized by The heat pump system comprises a memory, a processor, and a control program of the heat pump system stored in the memory and executable on the processor, and the control program of the heat pump system, when executed by the processor, implements the steps of the control method of the heat pump system according to any one of claims 1 to 14.

16. A storage medium, characterized by The storage medium stores a control program of a heat pump system, and the control program of the heat pump system, when executed by a processor, implements the steps of the control method of the heat pump system according to any one of claims 1 to 14.

Images