Control methods for heat pump systems, heat pump systems and storage media

Abstract

This invention discloses a control method for a heat pump system, a heat pump system, and a storage medium. The method includes: acquiring the energy storage temperature of the energy storage device; controlling the operation of the heat pump system based on the energy storage temperature to achieve a corresponding target state; wherein different target states correspond to different heat storage states of the energy storage device and / or different heating capacities of the indoor unit. This invention aims to improve the balance between indoor heating and heat storage effects of a heat pump system.

Description

Technical Field

[0001] This invention relates to the field of heat pump technology, and more particularly to a control method for a heat pump system, a heat pump system, and a storage medium. Background Technology

[0002] Many heat pump systems, such as air conditioners, are equipped with energy storage devices. In addition to regulating the indoor environment, the energy in the circulating refrigerant can also be stored in the energy storage device to meet other usage needs.

[0003] Heat pump systems require heat for both indoor heating and energy storage. When a user has both indoor heating and energy storage needs, the heat pump system will prioritize one need according to the user's configured parameters before switching to another mode to meet the other need. However, this is prone to problems with the actual operating conditions of the heat pump system, resulting in insufficient heat supply and low energy efficiency, leading to poor indoor heating and energy storage effects. Summary of the Invention

[0004] The main objective of this invention 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 enhance the balance between indoor heating and heat storage effects.

[0005] To achieve the above objectives, the present invention provides a control method for a heat pump system, the heat pump system including a refrigerant main circuit and refrigerant branch circuits connected to the refrigerant main circuit, the refrigerant main circuit including an indoor unit, and the refrigerant branch circuits including an energy storage device, the control method for the heat pump system including the following steps:

[0006] Obtain the energy storage temperature of the energy storage device;

[0007] The operation of the heat pump system is controlled according to the energy storage temperature to achieve the corresponding target state;

[0008] 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.

[0009] Optionally, 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:

[0010] When the energy storage temperature is lower than the first preset temperature, the heat pump system is controlled to operate to achieve the first state.

[0011] When the energy storage temperature is greater than the second preset temperature, the heat pump system is controlled to operate to achieve the second state.

[0012] When the energy storage temperature is greater than or equal to the first preset temperature, and when the energy storage temperature is less than or equal to the second preset temperature, the heat pump system is controlled to operate in order to maintain the current state of the heat pump system in the first state and the second state.

[0013] Wherein, the first preset temperature is less 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 less 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.

[0014] Optionally, the step of controlling the heat pump system to operate to achieve the first state when the energy storage temperature is lower than the first preset temperature further includes:

[0015] The electric heater is turned on to increase the heat storage capacity of the energy storage device.

[0016] Optionally, 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 operation of the heat pump system to achieve a corresponding first state includes:

[0017] Control the first control valve to operate at a preset opening degree less than or equal to the preset opening degree;

[0018] The step of controlling the operation of the heat pump system to achieve the second state includes:

[0019] The first control valve is controlled to operate at an opening greater than the preset opening degree.

[0020] Optionally, the indoor unit further includes an indoor fan corresponding to the indoor heat exchanger, and the step of controlling the heat pump system to operate to achieve the first state when the energy storage temperature is lower than the first preset temperature further includes:

[0021] Control the indoor fan to stop.

[0022] Optionally, 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 less than or equal to a preset degree further includes:

[0023] Obtain the current first high-pressure pressure of the heat pump system, and determine the first target high-pressure pressure corresponding to the heat pump system based on the energy storage temperature;

[0024] The first target frequency of the compressor is determined based on the first high pressure and the first target high pressure.

[0025] The compressor is controlled to operate at the first target frequency.

[0026] Optionally, 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 degree further includes:

[0027] Obtain the current second high-pressure pressure of the heat pump system, and determine the corresponding second target high-pressure pressure of the heat pump system based on the energy storage temperature and the indoor temperature of the indoor space regulated by the indoor unit;

[0028] The second target frequency of the compressor is determined based on the second high pressure and the second target high pressure.

[0029] The compressor is controlled to operate at the second target frequency.

[0030] Optionally, the control method for the heat pump system further includes:

[0031] When the heat pump system starts in the preset mode, the step of obtaining the energy storage temperature of the energy storage device is executed;

[0032] In the preset mode, the indoor unit has a heating requirement and the energy storage device has a heat storage requirement.

[0033] Optionally, after the step of controlling the operation of the heat pump system according to the energy storage temperature to achieve the corresponding first state, the method further includes:

[0034] When the heat pump system is in a preset mode, the indoor unit is controlled to output a prompt message to indicate that the operating status of the heat pump system conflicts with the preset mode.

[0035] In the preset mode, the indoor unit has a heating requirement and the energy storage device has a heat storage requirement.

[0036] In addition, to achieve the above objectives, this application also proposes a heat pump system, which includes a control device, a refrigerant main circuit and a refrigerant branch circuit connected to the refrigerant main circuit, wherein the refrigerant main circuit includes an indoor unit and the refrigerant branch circuit includes an energy storage device.

[0037] The control device includes: a memory, a processor, and a control program for a heat pump system stored in the memory and executable on the processor. When the control program for the heat pump system is executed by the processor, it implements the steps of the control method for the heat pump system as described in any of the preceding claims.

[0038] 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.

[0039] This invention proposes a control method for a heat pump system. The heat pump system includes a main refrigerant circuit comprising an indoor unit and a branch refrigerant circuit comprising an energy storage device. In this method, the heat pump system can adapt to the energy storage temperature of the energy storage device. While the energy storage device stores heat, it selects a mode corresponding to the indoor heating capacity. The operating mode of the heat pump system is no longer set by the user. The energy storage temperature accurately reflects the current operating conditions of the heat pump system. During operation, the heating capacity provided to the indoor unit by the energy storage device can precisely match the actual operating conditions, ensuring that the heat pump system can adapt to actual operating conditions and maximize user needs, thereby effectively improving system energy efficiency and enhancing the balance between indoor heating and heat storage effects of the heat pump system. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the structure of an embodiment of the heat pump system of the present invention;

[0041] Figure 2 This is a schematic diagram of another embodiment of the heat pump system of the present invention;

[0042] Figure 3 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;

[0043] Figure 4 This is a flowchart illustrating an embodiment of the control method for the heat pump system of the present invention;

[0044] Figure 5 This is a schematic flowchart of another embodiment of the control method for the heat pump system of the present invention;

[0045] Figure 6 This is a flowchart illustrating another embodiment of the control method for the heat pump system of the present invention;

[0046] Figure 7 This is a flowchart illustrating another embodiment of the control method for the heat pump system of the present invention.

[0047] 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

[0048] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0049] This invention provides a heat pump system.

[0050] In this embodiment of the invention, reference is made to Figures 1 to 3 The heat pump system includes a control device 100, a refrigerant main circuit, and refrigerant branch circuits connected to the refrigerant main circuit. The refrigerant main circuit includes an indoor unit, and the refrigerant branch circuits include an energy storage device 6.

[0051] In this embodiment, the refrigerant main circuit includes a compressor 1, an indoor unit, a throttling device 3, an outdoor heat exchanger 4, and a reversing assembly 5. The indoor unit, the throttling device 3, and the outdoor heat exchanger 4 are connected in sequence. The exhaust port of the compressor 1, the return port of the compressor 1, the indoor unit, and the outdoor heat exchanger 4 are all connected to the reversing assembly 5. The compressor 1, the throttling device 3, and the indoor unit are all connected to the control device 100.

[0052] 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, which drives 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.

[0053] In this embodiment, the number of indoor units is more than one, such as two, three, or four. In other embodiments, the number of indoor units may be one.

[0054] The reversing assembly 5 is used to switch 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 is connected to the indoor heat exchanger 21 and the return port of the compressor 1 is connected to the outdoor heat exchanger 4; when the reversing assembly 5 is in the second operating position, the exhaust port of the compressor 1 is connected to the outdoor heat exchanger 4 and the return port of the compressor 1 is connected to the indoor heat exchanger 21.

[0055] In one implementation of this embodiment, such as Figure 1 As shown, 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, and 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.

[0056] In another implementation of this embodiment, such as Figure 2 As shown, 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 port are respectively connected to different valve ports of the third four-way valve 53.

[0057] In other embodiments, the heat pump system may not include the reversing assembly 5, and the exhaust port of the compressor 1, the indoor heat exchanger 21, the first control valve 22, the throttling device 3, the outdoor heat exchanger 4, and the return port of the compressor 1 are connected in sequence in the refrigerant main circuit.

[0058] In this embodiment, the energy storage device 6 includes a water tank or a water heater. In other embodiments, the energy storage device 6 may also be a device that stores other energy storage media.

[0059] The first end of the refrigerant branch is connected to the exhaust port or return port of the compressor 1, and the pipe between the indoor unit and the outdoor heat exchanger 4 is connected to the second end of the refrigerant branch.

[0060] In this 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.

[0061] When the reversing assembly 5 is 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 the heat storage state, the indoor heat exchanger 21 is in the stopped heat release state, and the outdoor heat exchanger 4 is in the evaporation state.

[0062] When the reversing assembly 5 is in the first operating position and the first control valve 22 is open, a portion 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 portion 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. In this process, 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.

[0063] When the reversing assembly 5 is in the second operating position and the first control valve 22 is open, a portion 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. Another portion 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.

[0064] Furthermore, in this embodiment, referring to Figures 1 to 3 The refrigerant branch also 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 rate of the refrigerant branch and is connected to the control device 100.

[0065] In one implementation of this embodiment, the reversing assembly 5 further includes a switching valve (not shown), and the first end of the refrigerant branch is connected to the compressor's exhaust port or return port through the switching valve. The switching valve can be a four-way valve or a three-way valve, and the switching valve has a first state and a second state. When the switching valve is in the first state, the compressor 1's return port is connected to the energy storage device 6; when the switching valve is in the second state, the compressor 1's exhaust port is connected to the energy storage device 6.

[0066] Furthermore, in this embodiment, referring to Figures 1 to 3 The heat pump system also includes a temperature sensor 01 located within the energy storage device 6. 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.

[0067] Furthermore, in this embodiment, referring to Figure 3 The heat pump system also 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 heat stored in the energy storage device 6.

[0068] Furthermore, in this embodiment, referring to Figures 1 to 3 The heat pump system also includes a pressure sensor 02, which is located 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.

[0069] In this embodiment of the invention, reference is made to Figure 3 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.

[0070] Those skilled in the art will understand that Figure 3 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.

[0071] like Figure 3 As shown, the memory 1002, which serves as a computer storage medium, may include a control program for a heat pump system.

[0072] exist Figure 3In 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.

[0073] This invention also provides a control method for a heat pump system, applied to the aforementioned heat pump system.

[0074] Reference Figure 4 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:

[0075] Step S10: Obtain the energy storage temperature of the energy storage device;

[0076] The specific energy storage temperature can be obtained from the data detected by the temperature sensor installed in the energy storage device. It can be the temperature value detected by the temperature sensor in real time, or the temperature value determined by the temperature data detected by the temperature sensor within the current preset time period.

[0077] In this embodiment, when the heat pump system is in a preset mode, step S10 is executed. In this preset mode, the indoor unit has heating requirements and the energy storage device has heat storage requirements; the preset mode can be activated in response to user input commands.

[0078] Step S20: Control the operation of the heat pump system according to the energy storage temperature to achieve the 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 capacity.

[0079] Whether the energy storage device is in a heat storage state can be controlled by the control valve on the refrigerant branch and / or the 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.

[0080] The heating capacity of the indoor unit can be adjusted by the refrigerant flow rate through the indoor heat exchanger and / or the corresponding indoor fan speed. The refrigerant flow rate through the indoor heat exchanger can be adjusted by refrigerant regulators on the refrigerant branch line and / or on the main refrigerant line.

[0081] In this embodiment, the energy storage device is in a heat storage state in different target states, but the corresponding indoor unit heating capacity is different. Specifically, the heating capacity of the indoor unit varies depending on the range of energy storage temperature.

[0082] The system can determine the target state corresponding to the energy storage temperature and control the heat pump system according to the target state. In one implementation, at least two temperature ranges are pre-defined for the energy storage device. Different temperature ranges correspond to different target states or different selection rules for target states. Based on this, the temperature range containing the energy storage temperature can be determined, and the state corresponding to that temperature range can be determined as the target state, or the target state can be determined according to the state selection rules corresponding to that temperature range. 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. Different temperature difference values ​​correspond to different target states.

[0083] This invention proposes a control method for a heat pump system. The heat pump system includes a main refrigerant circuit comprising an indoor unit and a branch refrigerant circuit comprising an energy storage device. In this method, the heat pump system can adapt to the energy storage temperature of the energy storage device. While the energy storage device stores heat, it selects a mode corresponding to the indoor heating capacity. The operating mode of the heat pump system is no longer set by the user. The energy storage temperature accurately reflects the current operating conditions of the heat pump system. During operation, the heating capacity provided to the indoor unit by the energy storage device can precisely match the actual operating conditions, ensuring that the heat pump system can adapt to the actual operating conditions and maximize user needs, thereby effectively improving system energy efficiency and enhancing the balance between indoor heating and heat storage effects of the heat pump system.

[0084] Furthermore, after step S20, step S10 can be returned to be executed, thereby realizing the automatic switching of the heat pump system's operating status based on the energy storage temperature, further improving the balance between heat storage demand and indoor heating.

[0085] 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 5 The target state includes a first state or a second state, and step S20 includes:

[0086] Step S21: When the energy storage temperature is lower than the first preset temperature, control the heat pump system to operate to achieve the 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 the preset value.

[0087] The first preset temperature is specifically the minimum temperature that the energy storage device is allowed to reach when the heating state value (heating capacity and / or air outlet temperature, etc.) of the indoor unit is greater than or equal to the target heating capacity during the operation of the heat pump system in the second state.

[0088] In this embodiment, when the heat pump system is in the first state, the energy storage device 6 is in the heat storage state, the outdoor heat exchanger 4 is in the evaporation state, and the indoor heat exchanger 21 is in the stopped heat release state.

[0089] In this embodiment, the refrigerant branch 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 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 a second state, and the exhaust port of the compressor 1 is connected to the energy storage device 6) to put the energy storage device in a heat storage state. When the energy storage temperature is lower than the first preset temperature, the opening degree of the second control valve can be a fixed opening degree, or the second control valve can be determined according to the actual operating state of the heat pump system. In this 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 according to the subcooling. In other embodiments, the first end of the refrigerant branch is connected to the exhaust port of the compressor, and the refrigerant branch may not be provided with a second control valve, in which case the energy storage device is maintained in a heat storage state when the heat pump system is turned on; or, if the reversing assembly 5 includes a switching valve, the switching valve is in a second state, and the exhaust port of the compressor 1 is connected to the energy storage device 6.

[0090] A heat pump system can limit the amount of refrigerant flowing into the indoor unit to less than a preset flow rate through refrigerant regulators on the main refrigerant line and / or refrigerant branch lines, thereby reducing the heating capacity of the indoor unit to less than a preset value. The preset opening degree corresponds to the preset heating capacity of the indoor unit, which is the preset value.

[0091] In this 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 less than or equal to a preset degree. In this embodiment, the preset degree is the minimum opening degree allowed for the first control valve to operate. In this embodiment, when the energy storage temperature is lower than a first preset temperature, the first control valve is controlled to operate at its minimum opening degree. In other embodiments, when the energy storage temperature is lower than the first preset temperature, the first control valve may also be controlled to close. In other embodiments, the preset degree may also be greater than the minimum opening degree of the first control valve, or the preset degree may be 30% of the maximum opening degree of the first control valve.

[0092] Step S22: When the energy storage temperature is greater than the second preset temperature, control the heat pump system to operate to reach the second state, in which 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.

[0093] The second preset temperature can be obtained by increasing the first preset temperature by a temperature adjustment value. This temperature adjustment value can be a pre-set fixed value or a value determined based on the actual operating conditions of the heat pump system. For example, it can be determined based on the outdoor ambient temperature corresponding to the heat pump system.

[0094] In this embodiment, when the heat pump system is in the first state, the energy storage device 6 is in the heat storage state, the outdoor heat exchanger 4 is in the evaporation state, and the indoor heat exchanger 21 is in the heat release state.

[0095] In this embodiment, the refrigerant branch 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 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 opens to put the energy storage device in a heat storage state. When the energy storage temperature is greater than a second preset temperature, the opening degree of the second control valve can be a fixed opening degree or determined according to the actual operating state of the heat pump system. In this 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 according to the subcooling degree. In other embodiments, the first end of the refrigerant branch is connected to the exhaust port of the compressor, and the refrigerant branch may not be equipped with a second control valve. In this case, 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 is maintained in a heat storage state. When the energy storage temperature is greater than the second preset temperature, the opening degree of the second control valve can be less than when the energy storage temperature is less than the first preset temperature.

[0096] A 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 by using refrigerant regulators on the main refrigerant line and / or refrigerant regulators on the branch refrigerant lines, thereby ensuring that the indoor unit generates heat greater than or equal to a preset value.

[0097] In this 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 according to the corresponding indoor ambient temperature and the corresponding set temperature, or according to the corresponding indoor ambient temperature, the corresponding set temperature, the energy storage temperature, and the corresponding target energy storage temperature.

[0098] 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, control 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.

[0099] In a preset mode, the heat pump system can operate in one of two states, namely a first state and a second state, and monitor 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 system can be controlled to maintain the first state; if the system is currently operating in the second state, the system can be controlled to maintain the second state.

[0100] In this embodiment, when the energy storage temperature is lower than the first preset temperature, it indicates that the high pressure of the heat pump system is too low when operating in the second state, which cannot provide sufficient heat for both energy storage and indoor heating. Therefore, controlling the heat pump system to reach the first state prioritizes meeting the energy storage needs of the energy storage device, which helps to quickly increase the system's high pressure and improve the energy storage effect. Conversely, when the energy storage temperature is higher than the first preset temperature, it indicates that the high pressure of the heat pump system is high enough to provide sufficient heat for both energy storage and indoor heating. Therefore, controlling the heat pump system to reach the second state allows the energy storage device to store heat while the indoor heating system delivers heat to the room, simultaneously improving both the energy storage and indoor heating effects. When the energy storage temperature is between the first and second preset temperatures, the heat pump system maintains its current state between the first and second states, which helps reduce unnecessary state switching and improves system operational stability.

[0101] Furthermore, after step S21, step S22, or step S23, the process can return to step S10, thereby enabling the heat pump system to automatically switch operating states to meet both heat storage and indoor needs with optimal energy efficiency.

[0102] In other embodiments, when the energy storage temperature is greater than or equal to a first preset temperature, the heat pump system can be controlled to operate to achieve a second state. In other embodiments, the target state may also 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, the heat pump system can also be controlled to maintain operation in a state other than the first and second states.

[0103] When one end of the energy storage device is directly connected to the exhaust port of the compressor, the high pressure of the system will be low even if the heat storage of the energy storage device is stopped when the energy storage temperature is low, resulting in less heat being provided for indoor heating. Therefore, the heat storage needs of the energy storage device should be met first. After the energy storage temperature is increased, indoor heating and heat storage can be carried out simultaneously, which is conducive to meeting the heat storage needs while improving the indoor heating effect.

[0104] Furthermore, in this embodiment, during the execution of step S21, the method further includes: controlling the electric heater to turn on to increase the heat storage capacity of the energy storage device.

[0105] 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.

[0106] The electric heater can be turned on with fixed operating parameters, or it can be turned on with operating parameters determined according to the actual operating status 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 the thermal storage efficiency and the reliability of system operation.

[0107] In this embodiment, while the heat pump system is operating in the first state, an electric heater is turned on to assist in heating, thereby effectively improving the heat storage efficiency.

[0108] Furthermore, in this embodiment, the indoor unit also includes an indoor fan corresponding to the indoor heat exchanger. During the process of executing the step of controlling the heat pump system to operate to achieve the first state when the energy storage temperature is lower than the first preset temperature, the method further includes: controlling the indoor fan to stop.

[0109] Shutting down the indoor fan reduces the amount of heat exchanged between the indoor air regulated by the corresponding indoor unit and the indoor heat exchanger, ensuring that more heat is used for the energy storage device to store heat, thereby effectively improving the heat storage efficiency of the energy storage device and quickly reaching the required temperature.

[0110] Furthermore, based on any of the above embodiments, the refrigerant main circuit further includes a compressor connected to the indoor unit, thus providing another embodiment of the control method for the heat pump system of this application. In this embodiment, referring to... Figure 6 During the execution of step S21, the following is also included:

[0111] Step S211: Obtain the current first high pressure of the heat pump system, and determine the first target high pressure of the heat pump system based on the energy storage temperature;

[0112] The first high pressure can be specifically detected by the aforementioned pressure sensor.

[0113] The first target high-pressure is the target value that the heat pump system needs to achieve in the first state. Different energy storage temperatures correspond to different first target high-pressures, and the energy storage temperature is positively correlated with the corresponding first target high-pressure. The first target high-pressure can be obtained by looking up a table or by calculation using the energy storage temperature.

[0114] Step S212: Determine the first target frequency of the compressor based on the first high pressure and the first target high pressure;

[0115] Determine the magnitude or quantitative relationship between the first high-pressure and the first target high-pressure, and determine the first target frequency based on this magnitude or quantitative relationship.

[0116] 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 to become 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 decreased according to the frequency adjustment value to become the first target frequency.

[0117] 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 a table or calculating the first target frequency using the pressure difference.

[0118] Step S213: Control the compressor to operate at the first target frequency.

[0119] In this embodiment, during the operation of the heat pump system in the first state, the target high pressure of the system is determined based on the energy storage temperature of the energy storage device, and the target operating frequency of the compressor is determined based on the target high pressure and the actual high pressure to control the operation of the compressor. This ensures that the output capacity of the compressor in the first state can be precisely matched with the heat storage requirements of the energy storage device, ensuring that there is enough target high pressure to increase enough heat to meet the heat storage requirements of the energy storage device and improve the heat storage effect of the energy storage device.

[0120] 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 5 During the execution of step S22, the following also applies:

[0121] Step S221: Obtain the current second high pressure of the heat pump system, and determine the second target high pressure of the heat pump system based on the energy storage temperature and the indoor temperature of the indoor space regulated by the indoor unit.

[0122] The second high-pressure level can be specifically detected by the aforementioned pressure sensor. The indoor temperature is specifically detected by the temperature detection module located in the indoor space regulated by the indoor unit.

[0123] It should be noted that the indoor units mentioned here are those currently used for indoor heating.

[0124] The second target high-pressure is the target value that the heat pump system needs to achieve 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 a table or calculating the energy storage temperature and the indoor temperature.

[0125] Step S222: Determine the second target frequency of the compressor based on the second high pressure and the second target high pressure;

[0126] Determine the magnitude or quantitative relationship between the second high-pressure and the second target high-pressure, and determine the second target frequency based on this magnitude or quantitative relationship.

[0127] 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 to become 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 decreased according to the frequency adjustment value to become the second target frequency.

[0128] 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 a table or calculating the pressure difference.

[0129] Step S223: Control the compressor to operate at the second target frequency.

[0130] In this embodiment, during the operation of the heat pump system in the second state, the target high pressure of the system is determined based on the energy storage temperature of the energy storage device and the indoor temperature. Based on the target high pressure and the actual high pressure, the target operating frequency of the compressor is determined to control the compressor operation. This ensures that the output capacity of the compressor in the second state can be precisely matched with the heat storage requirements of the energy storage device and the indoor heating requirements. It ensures that there is sufficient target high pressure to increase enough heat to meet the heat storage requirements of the energy storage device and the indoor heating requirements of the indoor unit, thereby effectively improving both the heat storage effect of the energy storage device and the indoor heating requirements.

[0131] Furthermore, based on any of the above embodiments, another optional embodiment of the control method of the heat pump system of this application is proposed. In this 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 requirement and the energy storage device has a heat storage requirement.

[0132] When a preset command is received from the user, the heat pump system can start a preset mode. When the preset mode is started, it determines whether to switch the operating state based on the energy storage temperature.

[0133] Furthermore, based on any of the above embodiments, another optional embodiment of the control method of the heat pump system of this application is proposed. In this 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 requirement and the energy storage device has a heat storage requirement.

[0134] When a preset command is received from the user, the heat pump system can start a preset mode. When the preset mode is started, the heat pump system can first run in the second state. During this process, it is determined whether to switch the operating state based on the energy storage temperature.

[0135] In this 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 according to the actual needs of the user first, ensuring that the operation matches the user's needs. During this process, the operating state is further determined based on the energy storage temperature, so as to ensure 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, then different user needs are 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.

[0136] Furthermore, based on any of the above embodiments, another optional embodiment of the control method for the heat pump system of this application is proposed: when the heat pump system is in a preset mode, the indoor unit is controlled to output a prompt message to indicate that the operating status 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.

[0137] The prompt message can be output in any form, such as sound and / or display and / or vibration and / or light.

[0138] In this embodiment, when the heat pump system is running in the first state within 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, avoiding the user's mistaken belief that the heat pump system is malfunctioning. The user can also confirm whether to switch the operating mode based on their own needs, thereby further ensuring that the operation of the heat pump system is accurately matched with the user's needs.

[0139] 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.

[0140] 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.

[0141] 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.

[0142] 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.

[0143] 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 for a heat pump system, characterized in that, The heat pump system includes a refrigerant main circuit and refrigerant branch circuits connected to the refrigerant main circuit. The refrigerant main circuit includes an indoor unit, and the refrigerant branch circuits include energy storage devices. The control method of the heat pump system includes the following steps: Obtain the energy storage temperature of the energy storage device; The operation of the heat pump system is controlled according to the energy storage temperature to achieve the 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 capacity. 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 the first preset temperature, the heat pump system is controlled to operate to achieve the first state. When the energy storage temperature is greater than the second preset temperature, the heat pump system is controlled to operate to achieve the second state. When the energy storage temperature is greater than or equal to the first preset temperature, and when the energy storage temperature is less than or equal to the second preset temperature, the heat pump system is controlled to operate in order 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, in the first state the energy storage device is in a heat storage state and the heating capacity of the indoor unit is less 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.

2. The control method for a heat pump system as described in claim 1, characterized in that, The step of controlling the heat pump system to operate to achieve the first state when the energy storage temperature is lower than the first preset temperature further includes: The electric heater is turned on to increase the heat storage capacity of the energy storage device.

3. The control method for a heat pump system as described in claim 1, characterized in that, The indoor unit includes an indoor heat exchanger and a first control valve connected in series with the indoor heat exchanger. The step of controlling the operation of the heat pump system to achieve the corresponding first state includes: Control the first control valve to operate at a preset opening degree less than or equal to the preset opening degree; The step of controlling the operation of the heat pump system to achieve the second state includes: The first control valve is controlled to operate at an opening greater than the preset opening degree.

4. The control method for a heat pump system as described in claim 3, characterized in that, 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 preset opening degree further includes: Obtain the current first high-pressure pressure of the heat pump system, and determine the first target high-pressure pressure corresponding to the heat pump system based on the energy storage temperature; The first target frequency of the compressor is determined based on the first high pressure and the first target high pressure. The compressor is controlled to operate at the first target frequency.

5. The control method for a heat pump system as described in claim 3, characterized in that, The refrigerant main circuit also includes a compressor connected to the indoor unit. During the execution of the step of controlling the first control valve to operate at an opening greater than the preset opening degree, the following further steps are included: Obtain the current second high-pressure pressure of the heat pump system, and determine the corresponding second target high-pressure pressure of the heat pump system based on the energy storage temperature and the indoor temperature of the indoor space regulated by the indoor unit; The second target frequency of the compressor is determined based on the second high pressure and the second target high pressure. The compressor is controlled to operate at the second target frequency.

6. The control method for a heat pump system as described in claim 1, characterized in that, The indoor unit also includes an indoor fan corresponding to the indoor heat exchanger. During the step of controlling the heat pump system to operate to achieve the first state when the energy storage temperature is lower than the first preset temperature, the process further includes: Control the indoor fan to stop.

7. The control method for a heat pump system as described in any one of claims 1 to 6, characterized in that, The control method for the heat pump system also includes: When the heat pump system starts in the preset mode, the step of obtaining the energy storage temperature of the energy storage device is executed; In the preset mode, the indoor unit has a heating requirement and the energy storage device has a heat storage requirement.

8. The control method for a heat pump system as described in any one of claims 1 to 6, characterized in that, After the step of controlling the operation of the heat pump system according to the energy storage temperature to achieve the corresponding first state, the method further includes: When the heat pump system is in a preset mode, the indoor unit is controlled to output a prompt message to indicate that the operating status of the heat pump system conflicts with the preset mode. In the preset mode, the indoor unit has a heating requirement and the energy storage device has a heat storage requirement.

9. A heat pump system, characterized in that, The heat pump system includes a control device, a refrigerant main circuit, and refrigerant branch circuits connected to the refrigerant main circuit. The refrigerant main circuit includes an indoor unit, and the refrigerant branch circuits include an energy storage device. The control device includes: a memory, a processor, and a control program for a heat pump system stored in the memory and executable on the processor. When the control program for the heat pump system is executed by the processor, it implements the steps of the control method for the heat pump system as described in any one of claims 1 to 8.

10. A storage medium, characterized in that, The storage medium stores a control program for a heat pump system, which, when executed by a processor, implements the steps of the control method for a heat pump system as described in any one of claims 1 to 8.

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