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

Abstract

Disclosed in the present application are a control method for a heat pump system, a heat pump system and a storage medium The method comprises: acquiring the energy storage temperature of an energy storage apparatus; and, according to the energy storage temperature, controlling a heat pump system to operate so as to reach a corresponding target state, wherein different target states correspond to different heat storage states of the energy storage apparatus and / or different heating capacities of an indoor unit.

Description

Heat pump system control method, heat pump system and storage medium

[0001] This application claims priority to Chinese patent application No. 202310954065.9 filed on July 31, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present application relates to the field of heat pump technology, and in particular to a control method for a heat pump system, a heat pump system, and a storage medium. Background Art

[0003] Many heat pump systems, such as air conditioners, are equipped with energy storage devices. In addition to being used to regulate the indoor environment, the energy in the circulating refrigerant can also be stored in the energy storage device to meet other usage needs.

[0004] Among them, the heat pump system needs to use heat when heating indoors and storing heat in the energy storage device. When the user has both indoor heating and heat storage needs, the operation of the heat pump system will prioritize meeting one need according to the parameters configured by the user and then switch the operation mode to meet the other need. However, this is easy to cause the actual operating conditions of the heat pump system to be poor, the system provides insufficient heat and has low energy efficiency, resulting in poor indoor heating and heat storage effects. Technical issues

[0005] The main purpose of this application is to provide a control method for a heat pump system, a heat pump system and a storage medium, aiming to improve the energy efficiency of the heat pump system and improve the balance between the indoor heating effect and the heat storage effect of the heat pump system. Technical Solutions

[0006] To achieve the above objectives, the present application provides a control method for a heat pump system, the heat pump system comprising a main refrigerant circuit and a refrigerant branch circuit connected to the main refrigerant circuit, the main refrigerant circuit comprising an indoor unit, the refrigerant branch circuit comprising an energy storage device, and the control method for the heat pump system comprising the following steps:

[0007] Obtaining the energy storage temperature of the energy storage device;

[0008] Controlling the operation of the heat pump system according to the energy storage temperature to achieve a corresponding target state;

[0009] Among them, different energy storage temperatures correspond to different target states, and in different target states, the energy storage device is in a heat storage state and the indoor unit has different heating amounts.

[0010] In one embodiment, the target state includes a first state or a second state, and the step of controlling the operation of the heat pump system according to the energy storage temperature to achieve the corresponding target state includes:

[0011] When the energy storage temperature is lower than a first preset temperature, controlling the heat pump system to operate to reach the first state;

[0012] When the energy storage temperature is greater than a second preset temperature, controlling the heat pump system to operate to reach the second state;

[0013] When the energy storage temperature is greater than or equal to the first preset temperature and the energy storage temperature is less than or equal to a second preset temperature, controlling the heat pump system to operate so as to maintain the current state of the heat pump system in the first state and the second state;

[0014] Among them, the first preset temperature is lower than the second preset temperature, in the first state, the energy storage device is in a heat storage state and the heating capacity of the indoor unit is lower than a preset value, and in the second state, the energy storage device is in a heat storage state and the heating capacity of the indoor unit is greater than or equal to the preset value.

[0015] In one embodiment, when the energy storage temperature is lower than a first preset temperature, the step of controlling the heat pump system to operate to reach the first state further includes:

[0016] The electric heater is controlled to be turned on to increase the heat storage capacity of the energy storage device.

[0017] In one embodiment, the indoor unit includes an indoor heat exchanger and a first control valve connected in series with the indoor heat exchanger, and the step of controlling the heat pump system to operate to reach the corresponding first state includes:

[0018] Controlling the first control valve to operate at an opening less than or equal to a preset opening;

[0019] The step of controlling the heat pump system to operate to reach the second state comprises:

[0020] The first control valve is controlled to operate at an opening degree greater than the preset opening degree.

[0021] In one embodiment, the indoor unit further includes an indoor fan corresponding to the indoor heat exchanger, and when the energy storage temperature is lower than a first preset temperature, the step of controlling the heat pump system to operate to reach the first state further includes:

[0022] The indoor fan is controlled to stop.

[0023] In one embodiment, the refrigerant main circuit further includes a compressor connected to the indoor unit, and the step of controlling the first control valve to operate at a predetermined opening less than or equal to the predetermined opening further includes:

[0024] Obtaining a current first high-pressure pressure of the heat pump system, and determining a first target high-pressure pressure corresponding to the heat pump system according to the energy storage temperature;

[0025] determining a first target frequency of the compressor according to the first high-pressure pressure and the first target high-pressure pressure;

[0026] The compressor is controlled to operate at the first target frequency.

[0027] In one embodiment, the refrigerant main circuit further includes a compressor connected to the indoor unit, and the step of controlling the first control valve to operate at an opening greater than the preset opening further includes:

[0028] Obtaining a current second high-pressure pressure of the heat pump system, and determining a second target high-pressure pressure corresponding to the heat pump system according to the energy storage temperature and the indoor temperature of the indoor space regulated by the indoor unit;

[0029] determining a second target frequency of the compressor according to the second high-pressure pressure and the second target high-pressure pressure;

[0030] The compressor is controlled to operate at the second target frequency.

[0031] In one embodiment, the control method of the heat pump system further includes:

[0032] When the heat pump system starts a preset mode, performing the step of obtaining the energy storage temperature of the energy storage device;

[0033] Wherein, in the preset mode, the indoor unit has a heating demand and the energy storage device has a heat storage demand.

[0034] In one embodiment, after the step of controlling the heat pump system to operate according to the energy storage temperature to reach the corresponding first state, the method further includes:

[0035] When the heat pump system is in a preset mode, controlling the indoor unit to output a prompt message to prompt that the operating state of the heat pump system conflicts with the preset mode;

[0036] Wherein, in the preset mode, the indoor unit has a heating demand and the energy storage device has a heat storage demand.

[0037] In addition, to achieve the above-mentioned purpose, the present application also proposes a heat pump system, the heat pump system comprising a control device, a refrigerant main circuit and a refrigerant branch circuit connected to the refrigerant main circuit, the refrigerant main circuit comprising an indoor unit, and the refrigerant branch circuit comprising an energy storage device;

[0038] The control device includes: a memory, a processor, and a control program of the heat pump system stored in the memory and executable on the processor. 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 as described above are implemented.

[0039] 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. Beneficial effects

[0040] The present application proposes a control method for a heat pump system, in which a main refrigerant circuit including an indoor unit and a refrigerant branch circuit including an energy storage device are provided in the heat pump system. In the method, the heat pump system can adapt to the energy storage temperature of the energy storage device, and selects a mode corresponding to the matching indoor heating amount while the energy storage device stores heat. The operation mode of the heat pump system is no longer set by the user, and the energy storage temperature can accurately reflect the current operating conditions of the heat pump system. The heating amount provided to the indoor unit during the energy storage process of the energy storage device when the heat pump system is running can be accurately matched with the actual operating conditions, ensuring that the heat pump system can adapt to the actual operating conditions to meet user needs to the greatest extent, and effectively improve the system energy efficiency, thereby improving the balance between the indoor heating effect and the heat storage effect of the heat pump system. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] FIG1 is a schematic structural diagram of an embodiment of a heat pump system of the present application;

[0042] FIG2 is a schematic structural diagram of another embodiment of the heat pump system of the present application;

[0043] FIG3 is a schematic diagram of the hardware structure involved in the operation of an embodiment of the heat pump system of the present application;

[0044] FIG4 is a flow chart of an embodiment of a control method for a heat pump system of the present application;

[0045] FIG5 is a flow chart of another embodiment of a control method for a heat pump system according to the present application;

[0046] FIG6 is a flow chart of another embodiment of a control method for a heat pump system according to the present application;

[0047] FIG7 is a flow chart of another embodiment of a control method for a heat pump system of the present application.

[0048] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. Modes for Carrying Out the Invention

[0049] It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application.

[0050] An embodiment of the present application provides a heat pump system.

[0051] In the embodiment of the present application, referring to Figures 1 to 3, the heat pump system includes a control device 100, a refrigerant main circuit and a refrigerant branch circuit connected to the refrigerant main circuit, the refrigerant main circuit includes an indoor unit, and the refrigerant branch circuit includes an energy storage device 6.

[0052] In one embodiment, the refrigerant main circuit includes a compressor 1, an indoor unit, a throttling device 3, an outdoor heat exchanger 4, and a reversing assembly 5. The indoor unit, throttling device 3, and outdoor heat exchanger 4 are connected in sequence. The exhaust port of the compressor 1, the return air port of the compressor 1, the indoor unit, and the outdoor heat exchanger 4 are all connected to the reversing assembly 5. The compressor 1, throttling device 3, and indoor unit are all connected to a control device 100.

[0053] The indoor unit includes an indoor heat exchanger 21 and a first control valve 22 connected in series with the indoor heat exchanger 21. The indoor unit also includes an indoor fan 23 corresponding to the indoor heat exchanger 21. The indoor fan 23 is used to drive indoor air to exchange heat with the indoor heat exchanger 21. Both the first control valve 22 and the indoor fan 23 are connected to the control device 100.

[0054] In one embodiment, the number of the indoor unit is more than one, such as 2, 3, or 4. In other embodiments, the number of the indoor unit may also be one.

[0055] The reversing assembly 5 switches the refrigerant flow direction between the indoor unit and the outdoor heat exchanger 4. When the reversing assembly 5 is in the first operating position, the exhaust port of the compressor 1 communicates with the indoor heat exchanger 21, and the return air port of the compressor 1 communicates with the outdoor heat exchanger 4. When the reversing assembly 5 is in the second operating position, the exhaust port of the compressor 1 communicates with the outdoor heat exchanger 4, and the return air port of the compressor 1 communicates with the indoor heat exchanger 21.

[0056] In one embodiment, as shown in FIG1 , the reversing assembly 5 includes a first multi-way valve 51 and a second multi-way valve 52. The first multi-way valve 51 includes a first three-way valve or a first four-way valve, and the second multi-way valve 52 includes a second three-way valve or a second four-way valve. The indoor heat exchanger 21, the exhaust port, and the return port are respectively connected to different valve ports of the first multi-way valve 51, while the outdoor heat exchanger 4, the exhaust port, and the return port are respectively connected to different valve ports of the second multi-way valve 52.

[0057] In one embodiment, as shown in FIG2 , the reversing assembly 5 includes a third four-way valve 53 , and the indoor heat exchanger 21 , the outdoor heat exchanger 4 , the exhaust port, and the return air port are respectively connected to different valve ports of the third four-way valve 53 .

[0058] In one embodiment, the heat pump system may also not include the reversing component 5, and the exhaust port of the compressor 1 in the refrigerant main circuit, the indoor heat exchanger 21, the first control valve 22, the throttling device 3, the outdoor heat exchanger 4 and the return air port of the compressor 1 are connected in sequence.

[0059] In one embodiment, the energy storage device 6 includes a water tank or a water heater. In other embodiments, the energy storage device 6 may also be a device storing other energy storage media.

[0060] The first end of the refrigerant branch is connected to the exhaust port or the return port of the compressor 1, and the pipeline between the indoor unit and the outdoor heat exchanger 4 is connected to the second end of the refrigerant branch.

[0061] In one embodiment, the first end of the refrigerant branch is connected to the exhaust port of the compressor 1 , and the pipeline between the throttling device 3 and the first control valve 22 is connected to the second end of the refrigerant branch.

[0062] When the reversing assembly 5 operates in the first operating position and the first control valve 22 is closed, the refrigerant discharged from the compressor 1 flows through the refrigerant branch, the throttling device 3 and the outdoor heat exchanger 4 in sequence and then flows back to the compressor 1. When the high-temperature refrigerant flows through the refrigerant branch, the heat is stored in the energy storage device 6. The energy storage device 6 is in a heat storage state, the indoor heat exchanger 21 is in a heat release stop state, and the outdoor heat exchanger 4 is in an evaporation state.

[0063] When the reversing assembly 5 operates in the first operating position and the first control valve 22 is opened, a part of the refrigerant discharged from the compressor 1 flows through the refrigerant branch, the throttling device 3 and the outdoor heat exchanger 4 and then flows back to the compressor 1; another part of the refrigerant discharged from the compressor 1 flows through the indoor heat exchanger 21, the first control valve 22, the throttling device 3 and the outdoor heat exchanger 4 in sequence and then flows back to the compressor 1, wherein the energy storage device 6 is in a heat storage state, the indoor heat exchanger 21 is in a heat release state, and the outdoor heat exchanger 4 is in an evaporation state.

[0064] When the reversing assembly 5 operates in the second operating position and the first control valve 22 is opened, a part of the refrigerant discharged from the compressor 1 flows through the refrigerant branch, the first control valve 22 and the indoor heat exchanger 21 and then flows back to the compressor 1. The other part of the refrigerant discharged from the compressor 1 flows through the outdoor heat exchanger 4, the throttling device 3, the first control valve 22 and the indoor heat exchanger 21 in sequence and then flows back to the compressor 1. The indoor heat exchanger 21 is in an evaporating state and the outdoor heat exchanger 4 is in a condensing state.

[0065] In one embodiment, referring to FIG. 1 to FIG. 3 , the refrigerant branch further includes a second control valve 7 connected in series with the energy storage device 6 . The second control valve 7 can be used to control the flow of the refrigerant branch. The second control valve 7 is connected to the control device 100 .

[0066] In one embodiment, the reversing assembly 5 further includes a switching valve (not shown), through which the first end of the refrigerant branch is connected to the exhaust port or return port of the compressor. The switching valve can be a four-way valve or a three-way valve, and has a first state and a second state. When the switching valve is in the first state, the return port of the compressor 1 is connected to the energy storage device 6; when the switching valve is in the second state, the exhaust port of the compressor 1 is connected to the energy storage device 6.

[0067] 1 to 3 , the heat pump system further includes a temperature sensor 01 disposed in the energy storage device 6 , and the temperature sensor 01 is used to detect the energy storage temperature of the energy storage device 6 . The temperature sensor 01 is connected to the control device 100 .

[0068] In one embodiment, referring to FIG. 3 , the heat pump system further includes an electric heater 8 , which is connected to the control device 100 . The electric heater 8 can be used to heat the energy storage device 6 to increase the amount of heat stored in the energy storage device 6 .

[0069] In one embodiment, referring to Figures 1 to 3 , the heat pump system further includes a pressure sensor 02 , which is disposed on the exhaust side of the compressor 1 and is used to detect the high pressure of the heat pump system. The pressure sensor 02 is connected to the control device 100 .

[0070] In the embodiment of the present application, referring to FIG3 , a heat pump system control device 100 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. Memory 1002 can be high-speed RAM or non-volatile memory (NVM), such as a disk drive. Memory 1002 can also be a storage device independent of processor 1001.

[0071] Those skilled in the art will understand that the device structure shown in FIG3 does not constitute a limitation on the device, and may include more or fewer components than shown, or combine certain components, or arrange the components differently.

[0072] As shown in FIG3 , the memory 1002 as a computer storage medium may include a control program for the heat pump system.

[0073] In the device shown in FIG3 , 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.

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

[0075] 4 , an embodiment of a control method for a heat pump system of the present application is proposed. In one embodiment, the control method for a heat pump system includes:

[0076] Step S10, obtaining the energy storage temperature of the energy storage device;

[0077] The energy storage temperature can be specifically obtained based on data detected by a temperature sensor provided in the energy storage device. It can be the temperature value currently detected in real time by the temperature sensor, or it can be the temperature value determined by temperature data detected by the temperature sensor within a current preset time period.

[0078] In one embodiment, step S10 is executed when the heat pump system is in a preset mode in which the indoor unit has a heating demand and the energy storage device has a heat storage demand. The preset mode can be activated in response to a user input instruction.

[0079] Step S20, controlling the operation of the heat pump system according to the energy storage temperature to achieve a corresponding target state; wherein different energy storage temperatures correspond to different target states, and in different target states, the energy storage device is in a heat storage state and the indoor unit has different heating capacities.

[0080] Whether the energy storage device is in a heat storage state can be controlled by a control valve on the refrigerant branch line and / or a control valve on the refrigerant main line. The control valve can be used to control whether the high-temperature refrigerant is allowed to flow into or stop flowing into the energy storage device.

[0081] The heating capacity of the indoor unit can be specifically adjusted by the refrigerant flow rate flowing through the indoor heat exchanger and / or the indoor fan speed corresponding to the indoor heat exchanger. The refrigerant flow rate flowing through the indoor heat exchanger can be adjusted by a refrigerant regulating element on the refrigerant branch circuit and / or a refrigerant regulating element on the refrigerant main circuit.

[0082] In one embodiment, the energy storage device is in a heat storage state in different target states but corresponds to different heating capacities of the indoor units. Different energy storage temperature ranges correspond to different heating capacities of the indoor units.

[0083] The target state corresponding to the energy storage temperature can be determined, and the operation of the heat pump system can be controlled according to the operation corresponding to the target state. In one implementation, at least two temperature intervals corresponding to the energy storage device are pre-divided, and different temperature intervals correspond to different target states or different target state selection rules. Based on this, the temperature interval in which the energy storage temperature lies can be determined, and the state corresponding to this temperature interval can be determined as the target state, or the target state can be determined according to the state selection rules corresponding to this temperature interval. In another implementation, the temperature difference between the energy storage temperature and a preset temperature can be determined, and the target state can be determined based on the temperature difference, with different temperature differences corresponding to different target states.

[0084] An embodiment of the present application proposes a control method for a heat pump system, in which a main refrigerant circuit including an indoor unit and a refrigerant branch circuit including an energy storage device are provided in the heat pump system. In this method, the heat pump system can adapt to the energy storage temperature of the energy storage device, and selects a mode corresponding to the matching indoor heating amount while the energy storage device stores heat. The operation mode of the heat pump system is no longer set by the user, and the energy storage temperature can accurately reflect the current operating conditions of the heat pump system. The heating amount provided to the indoor unit during the energy storage process of the energy storage device when the heat pump system is running can be accurately matched with the actual operating conditions, ensuring that the heat pump system can adapt to the actual operating conditions to meet user needs to the greatest extent, and effectively improve the system energy efficiency, thereby improving the degree of consideration between the indoor heating effect and the heat storage effect of the heat pump system.

[0085] Furthermore, after step S20, the process may return to step S10, thereby automatically switching the operating state of the heat pump system based on the energy storage temperature, thereby further improving the balance between heat storage demand and indoor heating.

[0086] Furthermore, based on the above embodiment, another embodiment of the control method of the heat pump system of the present application is proposed. In one embodiment, referring to FIG5 , the target state includes the first state or the second state, and the step S20 includes:

[0087] Step S21, when the energy storage temperature is lower than a first preset temperature, controlling the heat pump system to operate to reach a first state, in which the energy storage device is in a heat storage state and the heating capacity of the indoor unit is lower than a preset value;

[0088] The first preset temperature is specifically the minimum temperature allowed for the energy storage device to reach when the heating state value (heating capacity and / or air outlet temperature, etc.) corresponding to the indoor unit during the operation of the heat pump system in the second state is greater than or equal to the target heating state.

[0089] In this embodiment, when the heat pump system is in the first state, the energy storage device 6 is in a heat storage state, the outdoor heat exchanger 4 is in an evaporation state, and the indoor heat exchanger 21 is in a heat release stop state.

[0090] In one embodiment, the refrigerant branch circuit includes an energy storage device and a second control valve connected in series with the energy storage device. The first end of the refrigerant branch circuit is connected to the exhaust port of the compressor. The second control valve is opened (if the reversing assembly 5 includes a switching valve, the switching valve is in the second state, and the exhaust port of the compressor 1 is connected to the energy storage device 6) to place the energy storage device in a heat storage state. When the energy storage temperature is less than a first preset temperature, the opening degree of the second control valve can be fixed, or the second control valve opening can be determined based on the actual operating state of the heat pump system. In one embodiment, the saturation temperature corresponding to the high pressure of the heat pump system and the outlet temperature of the energy storage device determine the corresponding subcooling degree, and the opening degree of the second control valve is determined based on the subcooling degree. In other embodiments, the first end of the refrigerant branch circuit is connected to the exhaust port of the compressor, and the refrigerant branch circuit may not be equipped with the second control valve. In this case, the energy storage device remains in the heat storage state when the heat pump system is turned on. Alternatively, if the reversing assembly 5 includes a switching valve, the switching valve is in the second state, and the exhaust port of the compressor 1 is connected to the energy storage device 6.

[0091] The heat pump system can limit the amount of refrigerant flowing into the indoor unit to less than a preset flow rate through the refrigerant regulating element in the main refrigerant circuit and / or the refrigerant regulating element in the branch refrigerant circuit, thereby reducing the heating capacity of the indoor unit to less than a preset value. The heating capacity of the indoor unit corresponding to the preset opening is the preset value.

[0092] In one embodiment, the indoor unit includes an indoor heat exchanger and a first control valve connected in series with the indoor heat exchanger, wherein the first control valve is controlled to operate at a predetermined opening less than or equal to a predetermined opening. In one embodiment, the predetermined opening is the minimum opening allowed for the first control valve. In one embodiment, when the energy storage temperature is less than a first predetermined temperature, the first control valve is controlled to operate at the minimum opening. In other embodiments, when the energy storage temperature is less than the first predetermined temperature, the first control valve may be controlled to close. In other embodiments, the predetermined opening may be greater than the minimum opening of the first control valve, or may be 30% of the maximum opening of the first control valve.

[0093] Step S22: When the energy storage temperature is greater than a second preset temperature, controlling the heat pump system to operate to reach a second state, wherein the energy storage device is in a heat storage state and the heating amount of the indoor unit is greater than or equal to the preset value;

[0094] The second preset temperature can be obtained by increasing the first preset temperature by a temperature adjustment value. The temperature adjustment value can be a preset fixed value or a value determined according to the actual operation of the heat pump system, for example, the temperature adjustment value can be determined according to the outdoor ambient temperature corresponding to the heat pump system.

[0095] In this embodiment, when the heat pump system is in the first state, the energy storage device 6 is in a heat storage state, the outdoor heat exchanger 4 is in an evaporation state, and the indoor heat exchanger 21 is in a heat release state.

[0096] In one embodiment, the refrigerant branch circuit includes an energy storage device and a second control valve connected in series with the energy storage device. The first end of the refrigerant branch circuit is connected to the exhaust port of the compressor (if the reversing assembly 5 includes a switching valve, the switching valve is in the second state, and the exhaust port of the compressor 1 is connected to the energy storage device 6). The second control valve is opened to place the energy storage device in a heat storage state. When the energy storage temperature is greater than a second preset temperature, the degree of opening of the second control valve can be fixed or determined based on the actual operating state of the heat pump system. In one embodiment, the saturation temperature corresponding to the high pressure of the heat pump system and the outlet temperature of the energy storage device determine the corresponding subcooling, and the opening degree of the second control valve is determined based on the subcooling. In other embodiments, the first end of the refrigerant branch circuit is connected to the exhaust port of the compressor, and the refrigerant branch circuit may not be equipped with a second control valve. In this way, when the heat pump system is turned on (if the reversing assembly 5 includes a switching valve, the switching valve is in the second state, and the exhaust port of the compressor 1 is connected to the energy storage device 6), the energy storage device remains in a heat storage state. Wherein, when the energy storage temperature is greater than the second preset temperature, the opening degree of the second control valve may be smaller than the opening degree of the second control valve when the energy storage temperature is less than the first preset temperature.

[0097] The heat pump system can limit the amount of refrigerant flowing into the indoor unit to be greater than or equal to a preset flow rate through the refrigerant regulating member on the refrigerant main circuit and / or the refrigerant regulating member on the refrigerant branch circuit, thereby making the heat generated by the indoor unit greater than or equal to a preset value.

[0098] In one embodiment, the indoor unit includes an indoor heat exchanger and a first control valve connected in series with the indoor heat exchanger. The first control valve is controlled to operate at an opening greater than a preset opening. The operating opening of the first control valve can be determined based on the corresponding indoor ambient temperature and the corresponding set temperature, and can also be determined based on the corresponding indoor ambient temperature and the corresponding set temperature as well as the energy storage temperature and the corresponding target energy storage temperature.

[0099] Step S23, when the energy storage temperature is greater than or equal to the first preset temperature, and the energy storage temperature is less than or equal to the second preset temperature, controlling the heat pump system to operate to maintain the current state of the heat pump system in the first state and the second state; wherein the first preset temperature is less than the second preset temperature.

[0100] In a preset mode, the heat pump system can operate in one of a first state and a second state and detect the energy storage temperature of the energy storage device. When the energy storage temperature is greater than or equal to the first preset temperature and less than or equal to the second preset temperature, if the heat pump system is currently operating in the first state, the heat pump system can be controlled to maintain the first state; if the heat pump system is currently operating in the second state, the heat pump system can be controlled to maintain the second state.

[0101] In one embodiment, if the energy storage temperature is less than the first preset temperature, this indicates that the heat pump system's high pressure is too low when operating in the second state, unable to provide sufficient heat for both the energy storage device and indoor heating. Therefore, the heat pump system is controlled to operate in the first state, prioritizing the energy storage device's heat storage needs. This facilitates a rapid increase in the system's high pressure, thereby improving the energy storage device's heat storage efficiency. Furthermore, if the energy storage temperature is greater than the first preset temperature, this indicates that the heat pump system's high pressure is sufficiently high to simultaneously provide sufficient heat for both the energy storage device and indoor heating. Therefore, the heat pump system is controlled to operate in the second state, allowing the energy storage device to store heat while the indoor heating device heats the room, thereby simultaneously improving both heat storage and indoor heating efficiency. When the energy storage temperature is between the first and second preset temperatures, the heat pump system maintains operation in the current state between the first and second states, thereby reducing unnecessary system state switching and improving system operational stability.

[0102] Furthermore, after step S21 or step S22 or step S23, the process may return to step S10, so that the heat pump system can automatically switch operating states to meet both heat storage needs and indoor needs with better energy efficiency.

[0103] In other embodiments, when the energy storage temperature is greater than or equal to a first preset temperature, the heat pump system may be controlled to operate to reach a second state. In other embodiments, the target state may further include a third state. In other embodiments, when the energy storage temperature is greater than or equal to the first preset temperature and the energy storage temperature is less than or equal to a second preset temperature, and the heat pump system operates in a state other than the first state and the second state, the heat pump system may be controlled to operate in a maintained state.

[0104] Among them, when one end of the energy storage device is directly connected to the exhaust port of the compressor, when the energy storage temperature is low, even if the energy storage device stops storing heat, the high-pressure pressure of the system will be low, and the amount of heat provided for indoor heating will be small. Based on this, the heat storage demand of the energy storage device is met first. After the energy storage temperature is increased, indoor heating and heat storage are carried out simultaneously, which is conducive to meeting the heat storage demand while improving the indoor heating effect.

[0105] In one embodiment, the execution of step S21 further includes: controlling the electric heater to turn on to increase the heat storage capacity of the energy storage device.

[0106] When the electric heater is turned on, the energy storage device can simultaneously store the heat generated by the electric heater and the heat flowing through the refrigerant.

[0107] The electric heater can be activated with fixed operating parameters or according to operating parameters determined by the actual operating state of the heat pump system. For example, the operating parameters of the electric heater can be determined based on the temperature difference between the energy storage temperature and the target energy storage temperature and / or the difference between the high pressure of the heat pump system and the target high pressure, thereby improving heat storage efficiency and system reliability.

[0108] In one embodiment, while the heat pump system is operating in the first state, the electric heater is turned on to assist heating, thereby effectively improving the heat storage efficiency.

[0109] In one embodiment, the indoor unit also includes an indoor fan corresponding to the indoor heat exchanger. When the energy storage temperature is lower than a first preset temperature, the step of controlling the heat pump system to operate to reach the first state further includes: controlling the indoor fan to stop.

[0110] The shutdown of the indoor fan can reduce the heat exchange between the indoor air conditioned by the corresponding indoor unit and the indoor heat exchanger, ensuring that more heat is used to store heat in the energy storage device, thereby effectively improving the heat storage efficiency of the energy storage device and quickly reaching the required temperature.

[0111] Furthermore, based on any of the above embodiments, the refrigerant main circuit further includes a compressor connected to the indoor unit, and another embodiment of the control method of the heat pump system of the present application is proposed. In one embodiment, referring to FIG6 , during the execution of step S21, the following further comprises:

[0112] Step S211, obtaining the current first high-pressure pressure of the heat pump system, and determining the first target high-pressure pressure corresponding to the heat pump system according to the energy storage temperature;

[0113] The first high pressure can be detected by the pressure sensor.

[0114] The first target high pressure is the target value that the high pressure of the heat pump system should reach in the first state. Different energy storage temperatures correspond to different first target high pressures. The energy storage temperature and the corresponding first target high pressure are positively correlated. The first target high pressure can be obtained by looking up the energy storage temperature in a table or calculating it.

[0115] Step S212, determining a first target frequency of the compressor according to the first high pressure and the first target high pressure;

[0116] A magnitude relationship or a quantitative relationship between the first high pressure and the first target high pressure is determined, and a first target frequency is determined based on the magnitude relationship or the quantitative relationship.

[0117] In one implementation, when the first high-pressure pressure is less than the first target high-pressure pressure, the current frequency of the compressor can be increased according to the frequency adjustment value as the first target frequency; when the first high-pressure pressure is greater than the first target high-pressure pressure, the current frequency of the compressor can be reduced according to the frequency adjustment value as the first target frequency.

[0118] In another implementation, the pressure difference between the first high pressure and the first target high pressure can be determined, and the first target frequency of the compressor can be determined based on the pressure difference, for example, by looking up the pressure difference in a table or calculating the first target frequency.

[0119] Step S213: Control the compressor to operate at the first target frequency.

[0120] In one embodiment, when the heat pump system is operating in the first state, a target high-pressure pressure of the system is determined based on the energy storage temperature of the energy storage device, and a target frequency required for the compressor to operate is determined based on the target high-pressure pressure and the actual high-pressure pressure to control the operation of the compressor, thereby ensuring that the output capacity of the compressor in the first state can accurately match the heat storage demand of the energy storage device, ensuring that there is sufficient target high-pressure pressure to increase sufficient heat to meet the heat storage demand of the energy storage device, and improving the heat storage effect of the energy storage device.

[0121] Furthermore, 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 one embodiment, referring to FIG5 , during the execution of step S22, the following steps are further included:

[0122] Step S221, obtaining the current second high pressure of the heat pump system, and determining a second target high pressure corresponding to the heat pump system according to the energy storage temperature and the indoor temperature of the indoor space regulated by the indoor unit;

[0123] The second high pressure can be specifically detected by the pressure sensor. The indoor temperature is specifically detected by a temperature detection module provided in the indoor space regulated by the indoor unit.

[0124] It should be noted that the indoor unit here is the indoor unit that currently has indoor heating demand.

[0125] The second target high pressure is the target value that the high pressure of the heat pump system should reach in the second state. Different energy storage temperatures and different indoor temperatures correspond to different second target high pressures. Both the energy storage temperature and the indoor temperature are positively correlated with the corresponding second target high pressure. The second target high pressure can be obtained by looking up the energy storage temperature and the indoor temperature in a table or by calculation.

[0126] Step S222, determining a second target frequency of the compressor according to the second high pressure and the second target high pressure;

[0127] A magnitude relationship or a quantitative relationship between the second high pressure and the second target high pressure is determined, and a second target frequency is determined based on the magnitude relationship or the quantitative relationship.

[0128] In one implementation, when the second high-pressure pressure is less than the second target high-pressure pressure, the current frequency of the compressor can be increased according to the frequency adjustment value as the second target frequency; when the second high-pressure pressure is greater than the second target high-pressure pressure, the current frequency of the compressor can be reduced according to the frequency adjustment value as the second target frequency.

[0129] In another implementation, the pressure difference between the second high pressure and the second target high pressure can be determined, and the second target frequency of the compressor can be determined based on the pressure difference, for example, by looking up the pressure difference in a table or calculating the second target frequency.

[0130] Step S223: Control the compressor to operate at the second target frequency.

[0131] In one embodiment, when the heat pump system is operating in the second state, a target high-pressure pressure of the system is determined based on the energy storage temperature of the energy storage device and the indoor temperature. The target frequency required for the compressor to operate is determined based on the target high-pressure pressure and the actual high-pressure pressure to control the operation of the compressor, thereby ensuring that the output capacity of the compressor in the second state can be accurately matched with the heat storage demand of the energy storage device and the indoor heating demand, ensuring that there is sufficient target high-pressure pressure to provide sufficient heat to meet the heat storage demand of the energy storage device and the indoor heating demand of the indoor unit, thereby effectively improving the heat storage effect of the energy storage device and the indoor heating demand.

[0132] Furthermore, based on any of the above embodiments, another optional embodiment of the control method of the heat pump system of the present application is proposed. In one embodiment, when the heat pump system starts a preset mode, the step of obtaining the energy storage temperature of the energy storage device is executed; wherein, in the preset mode, the indoor unit has a heating demand and the energy storage device has a heat storage demand.

[0133] When receiving a preset instruction input by the user, the heat pump system can start the preset mode. When the preset mode is started, it is determined whether the operating state needs to be switched based on the energy storage temperature.

[0134] Furthermore, based on any of the above embodiments, another optional embodiment of the control method of the heat pump system of the present application is proposed. In one embodiment, when the heat pump system starts a preset mode, the heat pump system is controlled to operate to reach the second state, and the step of obtaining the energy storage temperature of the energy storage device is executed; wherein, in the preset mode, the indoor unit has a heating demand and the energy storage device has a heat storage demand.

[0135] When receiving a preset instruction input by the user, the heat pump system can start the preset mode. When the preset mode is started, the heat pump system can first operate in the second state, and during this process, it is determined whether the operating state needs to be switched based on the energy storage temperature.

[0136] In one embodiment, when the preset mode is started, the heat pump system first operates in the second state, which is beneficial for the heat pump system to operate in accordance with the actual needs of the user first, ensuring that the operation matches the user needs. In this process, whether to switch the operating state is further determined based on the energy storage temperature, thereby ensuring that when different user needs cannot be met at the same time, some user needs can be met first; when different user needs can be met at the same time, different user needs can be met at the same time, thereby further improving the degree of matching between the indoor heating effect and / or heat storage effect of the heat pump system and the user.

[0137] Furthermore, based on any of the above embodiments, another optional embodiment of the control method of the heat pump system of the present application is proposed. When the heat pump system is in a preset mode, the indoor unit is controlled to output a prompt message to prompt that there is a conflict between the operating status of the heat pump system and the preset mode; wherein, in the preset mode, the indoor unit has a heating demand and the energy storage device has a heat storage demand.

[0138] The prompt information can be output in any form such as sound and / or display and / or vibration and / or light.

[0139] In one embodiment, when the heat pump system operates in the first state in the preset mode, the output of prompt information ensures that the user can know the current operating status of the heat pump system based on the prompt information, thereby preventing the user from mistakenly believing that the heat pump system has failed. The user can also confirm whether to switch the operating mode based on his or her own needs, thereby further ensuring that the operation of the heat pump system is accurately matched with the user's needs.

[0140] In addition, an embodiment of the present application 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.

[0141] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or system comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or system. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or system comprising the element.

[0142] The serial numbers of the above embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0143] 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 the necessary general hardware platform, and of course 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 application is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes a number of instructions for enabling a terminal device (which can be a mobile phone, computer, server, heat pump system, or network equipment, etc.) to execute the methods described in each embodiment of the present application.

[0144] The above are merely optional embodiments of the present application and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A control method for a heat pump system, wherein: 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, the refrigerant branch circuit comprises an energy storage device, and the control method of the heat pump system comprises the following steps: Acquiring the energy storage temperature of the energy storage device; Controlling the operation of the heat pump system according to the energy storage temperature to achieve a corresponding target state; Among them, different energy storage temperatures correspond to different target states, and in different target states, the energy storage device is in a heat storage state and the indoor unit has different heating capacities.

2. The control method of the heat pump system according to claim 1, wherein: The target state includes a first state or a second state, and the step of controlling the operation of the heat pump system according to the energy storage temperature to achieve the corresponding target state includes: When the energy storage temperature is lower than a first preset temperature, controlling the heat pump system to operate to reach the first state; When the energy storage temperature is greater than a second preset temperature, controlling the heat pump system to operate to reach the second state; When the energy storage temperature is greater than or equal to the first preset temperature, and the energy storage temperature is less than or equal to the second preset temperature, controlling the heat pump system to operate so as to maintain the current state of the heat pump system in the first state and the second state; Among them, the first preset temperature is lower than the second preset temperature, in the first state, the energy storage device is in a heat storage state and the heating capacity of the indoor unit is lower than a preset value, and in the second state, the energy storage device is in a heat storage state and the heating capacity of the indoor unit is greater than or equal to the preset value.

3. The control method of the heat pump system according to claim 2, wherein: The process of executing the step of controlling the heat pump system to operate to reach the first state when the energy storage temperature is lower than the first preset temperature further includes: The electric heater is controlled to be turned on to increase the heat storage amount of the energy storage device.

4. The control method of the heat pump system according to claim 2, wherein: The indoor unit includes an indoor heat exchanger and a first control valve connected in series with the indoor heat exchanger, and the step of controlling the heat pump system to operate to reach a corresponding first state includes: Controlling the first control valve to operate at an opening less than or equal to a preset opening; The step of controlling the heat pump system to operate to reach the second state comprises: The first control valve is controlled to operate at an opening degree greater than the preset opening degree.

5. The control method of the heat pump system according to claim 4, wherein: The refrigerant main circuit also includes a compressor connected to the indoor unit, and the step of controlling the first control valve to operate at a degree less than or equal to a preset opening also includes: Acquire a current first high pressure of the heat pump system, and determine a first target high pressure corresponding to the heat pump system according to the energy storage temperature; determining a first target frequency of the compressor according to the first high pressure and the first target high pressure; The compressor is controlled to operate at the first target frequency.

6. The control method of the heat pump system according to claim 4, wherein: The refrigerant main circuit further includes a compressor connected to the indoor unit, and the step of controlling the first control valve to operate at an opening greater than the preset opening also includes: Acquire the current second high pressure of the heat pump system, and determine the second target high pressure corresponding to the heat pump system according to the energy storage temperature and the indoor temperature of the indoor space regulated by the indoor unit; determining a second target frequency of the compressor according to the second high pressure and the second target high pressure; The compressor is controlled to operate at the second target frequency.

7. The control method of the heat pump system according to claim 2, wherein: The indoor unit further includes an indoor fan corresponding to the indoor heat exchanger. When the energy storage temperature is less than a first preset temperature, the process of controlling the heat pump system to operate to reach the first state further includes: The indoor fan is controlled to stop.

8. The control method of a heat pump system according to any one of claims 1 to 7, wherein: The control method of the heat pump system further includes: When the heat pump system starts a preset mode, the step of obtaining the energy storage temperature of the energy storage device is performed; Wherein, in the preset mode, the indoor unit has a heating demand and the energy storage device has a heat storage demand.

9. The control method of a heat pump system according to any one of claims 1 to 7, wherein: After the step of controlling the heat pump system to operate according to the energy storage temperature to reach the corresponding first state, the method further includes: When the heat pump system is in a preset mode, controlling the indoor unit to output a prompt message to prompt that the operating state of the heat pump system conflicts with the preset mode; Wherein, in the preset mode, the indoor unit has a heating demand and the energy storage device has a heat storage demand.

10. A heat pump system, wherein: 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 the refrigerant branch circuit comprises an energy storage device; The control device includes: a memory, a processor, and a control program of the heat pump system stored in the memory and executable on the processor. 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 as described in any one of claims 1 to 9 are implemented.

11. A storage medium, wherein: The storage medium stores a control program of the heat pump system, and when the control program of the heat pump system is executed by the processor, the steps of the control method of the heat pump system according to any one of claims 1 to 9 are implemented.

Images