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

Abstract

The invention discloses a control method of a heat pump system, the heat pump system and a storage medium. The method comprises the steps that the environment temperature and state parameters are obtained, and the state parameters represent the refrigeration state of an indoor heat exchanger and the heat storage state of an energy storage device; determining a target operation mode according to the environment temperature and the state parameters; the heat pump system is controlled to operate in the target operation mode; wherein the target operation mode comprises a first operation mode or a second operation mode, the indoor heat exchanger corresponding to the first operation mode is in an evaporation state, the energy storage device corresponding to the first operation mode is in a heat storage state, and the outdoor heat exchanger corresponding to the first operation mode is in a condensation state; and the indoor heat exchanger corresponding to the second operation mode is in an evaporation state, the energy storage device is in a heat storage state, and the outdoor heat exchanger is in an evaporation state. On the basis of ensuring the indoor refrigeration effect, the heat storage effect of the energy storage device is improved, and meanwhile the operation reliability of the system is improved.

Description

Technical Field

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

[0002] In addition to using energy to regulate the indoor environment, the heat pump system also has energy storage devices such as water tanks to provide the required energy for other needs. When the heat pump system has both indoor cooling needs and energy storage needs of the energy storage device, in order to ensure the indoor cooling effect, the outdoor heat exchanger is generally fixed in a condensing state, which can easily lead to insufficient heat storage efficiency of the energy storage device, affecting the heat storage effect of the heat pump system during the refrigeration process. Summary of the invention

[0003] The main purpose of the present invention is to provide a control method for a heat pump system, a heat pump system and a storage medium, aiming to improve the heat storage effect of the energy storage device while ensuring the indoor refrigeration effect and improving the system operation reliability.

[0004] To achieve the above object, the present invention provides a control method for a heat pump system, the heat pump system comprising a refrigerant main circuit and a refrigerant branch circuit connected to the refrigerant main circuit, the refrigerant main circuit comprising an indoor unit and an outdoor heat exchanger, the refrigerant branch circuit comprising an energy storage device, and the control method for the heat pump system comprising the following steps:

[0005] Acquiring an ambient temperature and a state parameter, wherein the state parameter indicates a cooling state of the indoor unit and a heat storage state of the energy storage device;

[0006] Determining a target operation mode of the heat pump system according to the ambient temperature and the state parameter;

[0007] Controlling the heat pump system to operate in the target operation mode;

[0008] Among them, the target operating mode includes a first operating mode or a second operating mode, the first operating mode corresponds to the indoor unit being in a cooling state, the energy storage device being in a heat storage state, and the outdoor heat exchanger being in a condensing state, and the second operating mode corresponds to the indoor unit being in a cooling state, the energy storage device being in a heat storage state, and the outdoor heat exchanger being in an evaporating state.

[0009] Optionally, the step of determining the target operation mode of the heat pump system according to the ambient temperature and the state parameter includes:

[0010] When the ambient temperature is less than or equal to a first preset ambient temperature, determining the first operating mode as the target operating mode;

[0011] When the ambient temperature is greater than a second preset ambient temperature, determining the target operation mode of the heat pump system according to the state parameter;

[0012] Wherein, the second preset ambient temperature is greater than or equal to the first preset ambient temperature.

[0013] Optionally, the second preset ambient temperature is greater than the first preset ambient temperature, and after the step of obtaining the ambient temperature and the state parameter, the method further includes:

[0014] When the ambient temperature is greater than the first preset ambient temperature and less than the second preset ambient temperature, the heat pump system is controlled to maintain the current operation mode.

[0015] Optionally, the step of determining the target operation mode of the heat pump system according to the state parameter comprises:

[0016] When the state parameter satisfies a first preset condition, determining the first operation mode as the target operation mode;

[0017] The first preset condition includes at least one of the following conditions:

[0018] The energy storage medium temperature of the energy storage device is greater than or equal to the first preset medium temperature;

[0019] The condensing temperature of the heat pump system is greater than or equal to the preset temperature;

[0020] The energy demand ratio of the heat pump system is greater than or equal to the preset ratio, and the energy demand ratio is the ratio of the energy demand of the indoor unit to the energy demand of the energy storage device.

[0021] Optionally, the step of determining the target operation mode of the heat pump system according to the state parameter comprises:

[0022] When the state parameter satisfies a second preset condition, determining the second operating mode as the target operating mode;

[0023] The second preset condition includes at least one of the following conditions:

[0024] The energy storage medium temperature of the energy storage device is lower than the second preset medium temperature;

[0025] The condensing temperature of the heat pump system is lower than a preset temperature;

[0026] The energy demand ratio of the heat pump system is less than a preset ratio, and the energy demand ratio is a ratio of the energy demand of the indoor unit to the energy demand of the energy storage device.

[0027] Optionally, the step of obtaining the state parameter includes:

[0028] Acquire a first energy requirement value of the indoor unit, and acquire a second energy requirement value of the energy storage device;

[0029] An energy demand ratio is determined according to a ratio of the first energy demand value to the second energy demand value, and the state parameter includes the energy demand ratio.

[0030] Optionally, the step of obtaining the first energy requirement value of the indoor unit includes:

[0031] Acquire the indoor temperature of the indoor space, the model of the indoor unit, and the rotation speed of the indoor fan in the indoor unit;

[0032] The first energy requirement value is determined according to the indoor temperature, the machine model, and the rotation speed.

[0033] Optionally, the step of obtaining the second energy requirement value of the energy storage device includes:

[0034] Acquire the energy storage medium temperature of the energy storage device, the outdoor environment temperature corresponding to the heat pump system, and the rated energy demand value of the energy storage device;

[0035] Determining an energy demand correction value according to the energy storage medium temperature and the outdoor ambient temperature;

[0036] The second energy requirement value is determined according to the energy requirement correction value and the rated energy requirement value of the energy storage device.

[0037] Optionally, the step of obtaining the rated energy requirement value of the energy storage device includes:

[0038] Obtaining the volume of the energy storage device for storing energy storage medium;

[0039] The rated energy demand is determined based on the volume.

[0040] Optionally, the indoor unit includes an indoor heat exchanger and a first throttling device, the refrigerant main circuit also includes a compressor, a reversing assembly and a second throttling device, the indoor heat exchanger, the first throttling device, the second throttling device and the outdoor heat exchanger are connected in sequence, the indoor heat exchanger, the outdoor heat exchanger, the exhaust port of the compressor, and the return air port of the compressor are all connected to the reversing assembly, the pipeline between the first throttling device and the second throttling device is connected to one end of the refrigerant branch, and the other end of the refrigerant branch is connected to the reversing assembly or the exhaust port of the compressor, and the step of controlling the heat pump system to operate the target operation mode includes:

[0041] When the target operation mode is the first operation mode, controlling the reversing assembly to operate so that the outdoor heat exchanger and the energy storage device are both connected to the exhaust port, and the indoor heat exchanger is connected to the return air port;

[0042] When the target operation mode is the second operation mode, the reversing assembly is controlled to operate so that both the indoor heat exchanger and the outdoor heat exchanger are connected to the return air port, and the energy storage device is connected to the exhaust port.

[0043] Optionally, the reversing assembly includes a first reversing valve, a second reversing valve and a switching valve, the exhaust port, the return air port and the indoor heat exchanger are all connected to the first reversing valve, the exhaust port, the return air port and the outdoor heat exchanger are all connected to the second reversing valve, the exhaust port, the return air port and the refrigerant branch are all connected to the switching valve, and when the target operation mode is the first operation mode, the step of controlling the reversing assembly to operate so that the outdoor heat exchanger and the energy storage device are all connected to the exhaust port, and the indoor heat exchanger is connected to the return air port includes:

[0044] When the target operation mode is the first operation mode, the first reversing valve is controlled to operate in a first valve position so that the return air port is connected to the indoor heat exchanger, the second reversing valve is controlled to operate in a third valve position so that the exhaust port is connected to the outdoor heat exchanger, and the switching valve is controlled to operate in a second switching state so that the exhaust port is connected to the energy storage device;

[0045] When the target operation mode is the second operation mode, the step of controlling the reversing assembly to operate so that both the indoor heat exchanger and the outdoor heat exchanger are connected to the return air port, and the energy storage device is connected to the exhaust port comprises:

[0046] When the target operating mode is the second operating mode, the first reversing valve is controlled to operate in the first valve position to connect the return air port with the indoor heat exchanger, the second reversing valve is controlled to operate in the fourth valve position to connect the return air port with the outdoor heat exchanger, and the switching valve is controlled to operate in the second switching state to connect the exhaust port with the energy storage device.

[0047] In addition, in order 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 heat exchanger and an outdoor heat exchanger, and the refrigerant branch circuit comprising an energy storage device;

[0048] 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 the above items are implemented.

[0049] 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.

[0050] The present invention proposes a control method for a heat pump system, which combines the ambient temperature and state parameters characterizing the cooling state of the indoor heat exchanger and the heat storage state of the energy storage device to determine the target operating mode of the heat pump system, wherein the outdoor heat exchanger is no longer fixed in a condensing state, but can switch between a condensing state and an evaporating state. When the outdoor heat exchanger is in an evaporating state, the heat absorbed by the heat pump system from the environment can be increased to improve the heat storage efficiency of the energy storage device. Based on this, during the process of indoor refrigeration and heat storage of the energy storage device, the outdoor heat exchanger can switch between the condensing state and the evaporating state to adapt to the refrigeration demand, heat storage demand and the reliable risk of operation in the current environment, thereby effectively ensuring the indoor refrigeration effect while improving the heat storage effect of the energy storage device and improving the system operation reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 A schematic diagram of the structure of an embodiment of a heat pump system of the present invention and a schematic diagram of the refrigerant flow direction in a first mode;

[0052] Figure 2 A schematic diagram of the structure of an embodiment of a heat pump system of the present invention and a schematic diagram of the refrigerant flow direction in a second mode;

[0053] Figure 3 A schematic diagram of the structure of an embodiment of a heat pump system of the present invention and a schematic diagram of the refrigerant flow direction in a third mode;

[0054] Figure 4 A schematic diagram of the structure of an embodiment of a heat pump system of the present invention and a schematic diagram of the refrigerant flow direction in a fourth mode;

[0055] Figure 5 A schematic diagram of the structure of an embodiment of a heat pump system of the present invention and a schematic diagram of the refrigerant flow direction in a fifth mode;

[0056] Figure 6 A schematic diagram of the structure of an embodiment of a heat pump system of the present invention and a schematic diagram of the refrigerant flow direction in a sixth mode;

[0057] Figure 7A schematic diagram of the hardware structure involved in the operation of an embodiment of a heat pump system of the present invention;

[0058] Figure 8 A schematic flow chart of an embodiment of a control method for a heat pump system of the present invention;

[0059] Fig. 9 A schematic flow chart of another embodiment of a control method for a heat pump system of the present invention;

[0060] Fig.10 It is a schematic diagram of the corresponding relationship between the temperature difference value and the temperature difference range involved in the embodiment of the control method of the heat pump system of the present invention.

[0061] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0062] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0063] An embodiment of the present invention provides a heat pump system.

[0064] In the embodiment of the present invention, refer to Figures 1 to 7 The heat pump system includes a control device 100, a refrigerant main circuit and a refrigerant branch circuit, wherein the refrigerant main circuit includes a compressor 1, an indoor unit, an outdoor heat exchanger 3, a second throttling device 4, an outdoor unit and a reversing component 5, and the refrigerant branch circuit includes an energy storage device 7 and a first control valve 8. The indoor unit, the reversing component 5, the compressor 1, the second throttling device 4 and the first control valve 8 are all connected to the control device 100. The outdoor unit includes the outdoor heat exchanger 3, the second throttling device 4, the reversing component 5 and the first control valve 8. The second throttling device 4 and the first control valve 8 can be electronic expansion valves.

[0065] In this embodiment, the energy storage device 7 is loaded with an energy storage medium, and the energy storage medium can absorb and store the energy of the refrigerant when the refrigerant flows through the energy storage device 7. In this embodiment, the energy storage device 7 is a water tank.

[0066] In this embodiment, one end of the refrigerant branch is connected to the exhaust port of the compressor 1, the pipeline between the indoor unit and the outdoor heat exchanger 3 is connected to the other end of the refrigerant branch, and specifically, the pipeline between the second throttling device 4 and the indoor unit is connected to the other end of the refrigerant branch.

[0067] In this embodiment, the number of the indoor units is more than one, and the more than one indoor units can be connected in parallel. Different indoor units are arranged in different indoor spaces to adjust the indoor environment of different indoor spaces.

[0068] The indoor unit includes an indoor heat exchanger 21 and a first throttling device 22 connected in series with the indoor heat exchanger 21. The first throttling device 22 is connected to the control device 100. The control device 100 can be used to control the flow rate of the refrigerant flowing through the indoor heat exchanger 21. The first throttling device 22 can be an electronic expansion valve.

[0069] The indoor unit, the second throttling device 4 and the outdoor heat exchanger 3 are connected in sequence, and the pipeline between the second throttling device 4 and the indoor unit is connected to one end of the refrigerant branch. The indoor unit, the outdoor heat exchanger 3, the exhaust port of the compressor 1 and the return air port of the compressor 1 are all connected to the reversing component 5. The reversing component 5 can be used to switch the connection state between the indoor unit and the outdoor heat exchanger 3 and the exhaust port of the compressor 1 and the return air port of the compressor 1.

[0070] In this embodiment, the reversing assembly 5 includes a first reversing valve 51 and a second reversing valve 52. The exhaust port of the compressor 1, the return air port of the compressor 1, and the indoor unit are respectively connected to different valve ports of the first reversing valve 51, and the exhaust port of the compressor 1, the return air port of the compressor 1, and the outdoor heat exchanger 3 are respectively connected to different valve ports of the second reversing valve 52. In one implementation of this embodiment, the first reversing valve 51 is a first four-way valve, and the second reversing valve 52 is a second four-way valve. In another implementation of this embodiment, the first reversing valve 51 is a first three-way valve, and the second reversing valve 52 is a second three-way valve.

[0071] The first reversing valve 51 has a first valve position and a second valve position. In the first valve position, the return air port of the compressor 1 is connected to the indoor heat exchanger 21, and the exhaust port of the compressor 1 is blocked from the indoor heat exchanger 21. In the second valve position, the return air port of the compressor 1 is blocked from the indoor heat exchanger 21, and the exhaust port of the compressor 1 is connected to the indoor heat exchanger 21.

[0072] The second reversing valve 52 has a third valve position and a fourth valve position. In the third valve position, the exhaust port of the compressor 1 is connected to the outdoor heat exchanger 3, and the return air port of the compressor 1 is blocked from the outdoor heat exchanger 3; in the fourth valve position, the exhaust port of the compressor 1 is blocked from the outdoor heat exchanger 3, and the return air port of the compressor 1 is connected to the outdoor heat exchanger 3.

[0073] In some embodiments, the reversing assembly 5 may further include a switching valve 53, and the reversing assembly 5 (switching valve 53) can be used to switch the connection state between the energy storage device 7 and the exhaust port of the compressor 1 and the return port of the compressor 1. The refrigerant branch, the exhaust port of the compressor 1, and the return port of the compressor 1 are all connected to the switching valve 53. The switching valve 53 can be a three-way valve or a four-way valve, and the switching valve 53 includes a first switching state and a second switching state; when the switching valve 53 is in the first switching state, the return port of the compressor 1 is connected to the energy storage device 7; when the switching valve 53 is in the second switching state, the exhaust port of the compressor 1 is connected to the energy storage device 7.

[0074] Through the regulation of the first reversing valve 51, the second reversing valve 52, the first control valve 8, the first throttling device 22 and the switching valve 53, the operation modes of the heat pump system include but are not limited to the following modes:

[0075] In the first mode, refer to Figure 1 , the first reversing valve 51 operates at the first valve position, the second reversing valve 52 operates at the fourth valve position, the first throttling device 22 is closed, and the first control valve 8 is opened. If the reversing assembly 5 includes a switching valve, the switching valve is in the second switching state, the exhaust port of the compressor 1 is connected to the energy storage device 7, and all the refrigerant discharged from the compressor 1 flows into the refrigerant branch. The heat of the refrigerant flowing into the refrigerant branch is stored in the energy storage device 7 when flowing through the energy storage device 7. The refrigerant flowing out of the refrigerant branch flows through the second throttling device 4 and the outdoor heat exchanger 3 in turn and then flows back to the compressor 1. In the first mode, the indoor heat exchanger 21 stops heat exchange, the outdoor heat exchanger 3 is in an evaporating state, and all heat is used to store heat in the energy storage device 7. In the first mode, the energy storage device 7 can be stored heat separately. Among them, if there is a switching valve 53, the switching valve 53 is in the second switching state.

[0076] In the second mode, refer to Figure 2, the first reversing valve 51 operates at the first valve position, the second reversing valve 52 operates at the third valve position, the first control valve 8 is opened, and the first throttling device 22 is opened. If the reversing assembly 5 includes a switching valve, the switching valve is in the second switching state, the exhaust port of the compressor 1 is connected to the energy storage device 7, a part of the refrigerant discharged by the compressor 1 flows through the outdoor heat exchanger 3 and the second throttling device 4 in sequence, and another part of the refrigerant discharged by the compressor 1 flows into the refrigerant branch. The heat of the refrigerant flowing into the refrigerant branch is stored in the energy storage device 7 when flowing through the energy storage device 7. The refrigerant flowing out of the refrigerant branch merges with the refrigerant flowing out of the second throttling device 4 and then flows into the indoor unit for evaporation and then flows back to the compressor 1. In the second mode, the indoor heat exchanger 21 is in the evaporation state, and the outdoor heat exchanger 3 is in the condensation state. In the second mode, when the indoor space regulated by the indoor unit has a heat exchange demand, the indoor fan in the indoor unit can be turned on to drive the indoor air to exchange heat with the indoor heat exchanger 21; in the second mode, when the indoor space regulated by the indoor unit does not have a heat exchange demand, the indoor fan in the indoor unit can be turned off. In the second mode, the heat absorbed by the outdoor heat exchanger 3 from the environment in which it is located can be stored in the energy storage device 7. In the second mode, the indoor environment can be cooled while the energy storage device 7 stores heat, or the compressor 1 oil in the refrigerant branch can be refluxed to the compressor 1 while the energy storage device 7 stores heat. If there is a switching valve 53, the switching valve 53 is in the second switching state.

[0077] In the third mode, refer to Figure 3 , the first reversing valve 51 operates at the first valve position, the second reversing valve 52 operates at the fourth valve position, the first control valve 8 is opened, and the first throttling device 22 operates in throttling. If the reversing assembly 5 includes a switching valve, the switching valve is in the second switching state, the exhaust port of the compressor 1 is connected to the energy storage device 7, and all the refrigerant discharged from the compressor 1 flows into the refrigerant branch. The heat of the refrigerant flowing into the refrigerant branch is stored in the energy storage device 7 when flowing through the energy storage device 7. A part of the refrigerant flowing out of the refrigerant branch flows through the second throttling device 4 and the outdoor heat exchanger 3 in sequence and then flows back to the compressor 1. The other part of the refrigerant flowing out of the refrigerant branch flows through the first throttling device 22 and the indoor heat exchanger 21 in sequence and then flows back to the compressor 1. In the third mode, the indoor heat exchanger 21 and the outdoor heat exchanger 3 are both in the evaporation state. In the third mode, when the indoor space regulated by the indoor unit has a heat exchange demand, the indoor fan in the indoor unit can be turned on to drive the indoor air to exchange heat with the indoor heat exchanger 21; in the third mode, when the indoor space regulated by the indoor unit does not have a heat exchange demand, the indoor fan in the indoor unit can be turned off. In the third mode, the heat absorbed by the indoor heat exchanger 21 and the outdoor heat exchanger 3 from their environment can be stored in the energy storage device 7. In the third mode, the indoor environment can be cooled while the energy storage device 7 stores heat. Among them, if there is a switching valve 53, the switching valve 53 is in the second switching state.

[0078] In the fourth mode, refer to Figure 4, the first reversing valve 51 operates at the first valve position, the second reversing valve 52 operates at the third valve position, the first control valve 8 is closed, and the first throttling device 22 is opened. The refrigerant discharged from the compressor 1 flows through the outdoor heat exchanger 3, the second throttling device 4, the first throttling device 22, and the indoor heat exchanger 21 in sequence and then flows back to the compressor 1. In the fourth mode, the indoor heat exchanger 21 is in an evaporating state and the outdoor heat exchanger 3 is in a condensing state. In the fourth mode, when the indoor space regulated by the indoor unit has a heat exchange demand, the indoor fan in the indoor unit can be turned on to drive the indoor air to exchange heat with the indoor heat exchanger 21; in the fourth mode, when the indoor space regulated by the indoor unit does not have a heat exchange demand, the indoor fan in the indoor unit can be turned off. In the fourth mode, the indoor environment can be cooled while the energy storage device 7 stops storing heat. Among them, if there is a switching valve 53, the switching valve 53 is in the second switching state.

[0079] In the fifth mode, refer to Figure 5 , the first reversing valve 51 operates at the second valve position, the second reversing valve 52 operates at the fourth valve position, the first control valve 8 is closed, and the first throttling device 22 is opened. The refrigerant discharged from the compressor 1 flows through the indoor heat exchanger 21, the first throttling device 22, the second throttling device 4 and the outdoor heat exchanger 3 in sequence and then flows back to the compressor 1. In the fifth mode, the indoor heat exchanger 21 is in a condensing state and the outdoor heat exchanger 3 is in an evaporating state. In the fifth mode, when the indoor space regulated by the indoor unit has a heat exchange demand, the indoor fan in the indoor unit can be turned on to drive the indoor air to exchange heat with the indoor heat exchanger 21; in the fifth mode, when the indoor space regulated by the indoor unit does not have a heat exchange demand, the indoor fan in the indoor unit can be turned off. In the fifth mode, the indoor environment can be heated while the energy storage device 7 stops storing heat. Among them, if there is a switching valve 53, the switching valve 53 is in the second switching state.

[0080] In the sixth mode, refer to Figure 6, the first reversing valve 51 operates at the second valve position, the second reversing valve 52 operates at the fourth valve position, the first control valve 8 is opened, and the first throttling device 22 is opened. A part of the refrigerant discharged from the compressor 1 flows through the indoor heat exchanger 21, the first throttling device 22, the second throttling device 4 and the outdoor heat exchanger 3 in sequence and then flows back to the compressor 1; another part of the refrigerant discharged from the compressor 1 flows into the refrigerant branch, and the heat is stored in the energy storage device 7 when the refrigerant flows through the energy storage device 7. The refrigerant flowing out of the refrigerant branch merges with the refrigerant flowing out of the indoor unit and flows through the second throttling device 4 and the outdoor heat exchanger 3 in sequence and then flows back to the compressor 1. In the sixth mode, the indoor heat exchanger 21 is in a condensing state and the outdoor heat exchanger 3 is in an evaporating state. In the sixth mode, when the indoor space regulated by the indoor unit has a heat exchange demand, the indoor fan in the indoor unit can be turned on to drive the indoor air to exchange heat with the indoor heat exchanger 21; in the sixth mode, when the indoor space regulated by the indoor unit does not have a heat exchange demand, the indoor fan in the indoor unit can be turned off. In the sixth mode, the indoor environment can be heated while the energy storage device 7 stores heat. If there is a switching valve 53, the switching valve 53 is in the second switching state.

[0081] In other embodiments, the reversing assembly 5 may also include a third four-way valve, and the exhaust port of the compressor 1, the return air port of the compressor 1, the indoor heat exchanger 21 and the outdoor heat exchanger 3 are respectively connected to different valve ports of the third four-way valve.

[0082] Further, see Figure 7 The heat pump system further includes a pressure sensor 01, which is connected to the control device 100. The pressure sensor 01 can be arranged on the exhaust side of the compressor 1 to detect the condensing pressure.

[0083] Further, see Figure 7 The heat pump system further includes an environment sensor 02, which can be arranged in the environment where the heat pump system is located to detect the environment temperature. The environment sensor 02 is connected to the control device 100. The environment temperature here includes the indoor environment temperature and / or the outdoor environment temperature.

[0084] Further, see Figure 7 The heat pump system further includes a temperature detection module 03, which is connected to the control device 100. The temperature detection module 03 can be arranged inside the energy storage device 7 to detect the temperature of the energy storage medium of the energy storage device 7.

[0085] In the embodiment of the present invention, refer to Figure 7The control device 100 of the heat pump system includes: a processor 1001, such as a CPU, a memory 1002, and a timer 1003. Among them, these components are connected and communicated through a communication bus. The memory 1002 can be a high-speed RAM memory or a stable memory (non-volatile memory), such as a disk memory. The memory 1002 can also be a storage device independent of the aforementioned processor 1001.

[0086] Those skilled in the art will understand that Figure 7 The device structure shown in the figure does not constitute a limitation of the device, and may include more or less components than shown in the figure, or combine certain components, or arrange the components differently.

[0087] like Figure 7 As shown, the memory 1002 as a computer storage medium may include a control program for the heat pump system.

[0088] exist Figure 7 In the device shown, the processor 1001 can be used to call the control program of the heat pump system stored in the memory 1002, and execute the relevant step operations of the control method of the heat pump system in the following embodiment.

[0089] An embodiment of the present invention also provides a control method for a heat pump system.

[0090] Reference Figure 8 , an embodiment of a control method of a heat pump system of the present application is proposed. In this embodiment, the control method of the heat pump system includes:

[0091] Step S10, obtaining the ambient temperature and state parameters, wherein the state parameters represent the cooling state of the indoor heat exchanger and the heat storage state of the energy storage device;

[0092] In this embodiment, the ambient temperature is the outdoor ambient temperature. In other embodiments, when the heat pump system is started, the ambient temperature may also be the indoor ambient temperature. Alternatively, the ambient temperature includes the indoor ambient temperature and the outdoor ambient temperature.

[0093] The state parameters include but are not limited to at least one of the following parameters: the energy demand value of the indoor unit, the temperature of the indoor heat exchanger, the indoor ambient temperature of the indoor space where the indoor heat exchanger is located, the indoor fan speed corresponding to the indoor heat exchanger, the outdoor ambient temperature of the outdoor space where the outdoor heat exchanger is located, the energy storage medium temperature of the energy storage device, the temperature change value of the energy storage medium in the energy storage device, the energy demand value of the energy storage device, the relationship value between the energy demand of the indoor unit and the energy demand of the energy storage device, the system pressure, and the like.

[0094] In this embodiment, when at least one indoor unit has a cooling demand and the energy storage device has a heat storage demand, step S10 is executed. For example, when a start instruction of the cooling and heat storage mode is received, step S10 is executed.

[0095] Step S20, determining a target operation mode of the heat pump system according to the ambient temperature and the state parameter, wherein the target operation mode includes a first operation mode or a second operation mode;

[0096] The first operating mode may specifically be the second mode mentioned above, and the second operating mode may specifically be the third mode mentioned above.

[0097] Different ambient temperatures and different state parameters correspond to different target operating modes.

[0098] In one implementation, the target operating mode is determined according to the interval in which the ambient temperature is located and the interval in which the state parameter is located.

[0099] In another implementation, the characterization value can be calculated by substituting the ambient temperature and state parameters into a preset formula. When the characterization value is in a first interval, the first operating mode is determined as the target operating mode. When the characterization value is in a second interval, the second operating mode is determined as the target operating mode.

[0100] Step S30, controlling the heat pump system to operate in the target operation mode;

[0101] The target operating parameters of each component (compressor, reversing assembly, throttling device, control valve, etc.) in the heat pump system are determined according to the target operating mode, and the operation of each component in the heat pump system is controlled accordingly according to each target operating parameter.

[0102] Among them, the indoor unit corresponding to the first operating mode is in a cooling state, the energy storage device is in a heat storage state, and the outdoor heat exchanger is in a condensing state, and the indoor unit corresponding to the second operating mode is in a cooling state, the energy storage device is in a heat storage state, and the outdoor heat exchanger is in an evaporating state.

[0103] A control method for a heat pump system is proposed in an embodiment of the present invention. The method combines the ambient temperature and state parameters characterizing the cooling state of the indoor heat exchanger and the heat storage state of the energy storage device to determine the target operation mode of the heat pump system, wherein the outdoor heat exchanger is no longer fixed in a condensing state, but can switch between a condensing state and an evaporating state. When the outdoor heat exchanger is in an evaporating state, the amount of heat absorbed by the heat pump system from the environment can be increased to improve the heat storage efficiency of the energy storage device. Based on this, during the process of indoor cooling and heat storage of the energy storage device, the outdoor heat exchanger can switch between the condensing state and the evaporating state to adapt to the cooling demand, the heat storage demand and the reliable risk of operation in the current environment, thereby effectively ensuring the indoor cooling effect while improving the heat storage effect of the energy storage device and improving the system operation reliability.

[0104] Further, based on any of the above embodiments, another embodiment of the control method of the heat pump system of the present application is proposed. In this embodiment, referring to Fig. 9 , the step of determining the target operation mode of the heat pump system according to the ambient temperature and the state parameter comprises:

[0105] Step S21, when the ambient temperature is less than or equal to a first preset ambient temperature, determining the first operation mode as the target operation mode;

[0106] The first preset ambient temperature is specifically a minimum value of the ambient temperature allowed when the outdoor heat exchanger has no risk of frost.

[0107] Step S22, when the ambient temperature is greater than a second preset ambient temperature, determining the target operation mode of the heat pump system according to the state parameter;

[0108] Wherein, the second preset ambient temperature is greater than or equal to the first preset ambient temperature.

[0109] The second preset ambient temperature is specifically the minimum value that the ambient temperature needs to reach when the outdoor heat exchanger is in an evaporating state to improve the heat storage efficiency of the energy storage device.

[0110] The first preset ambient temperature and the second preset ambient temperature can be pre-set fixed values, or they can be values ​​determined according to the actual operating conditions of the heat pump system. For example, the first preset ambient temperature and the second preset ambient temperature can be determined based on the indoor heat exchanger temperature, the compressor operating frequency, the energy storage medium temperature of the energy storage device, and the number of indoor units that are turned on for cooling operation.

[0111] In this embodiment, when the ambient temperature is less than or equal to the first preset ambient temperature, there is a risk of frost formation on the outdoor heat exchanger in the evaporation state. At this time, the first operation mode is used as the target operation mode. While the indoor refrigeration and the energy storage device are storing heat, the outdoor heat exchanger is operated in the condensation state, which can effectively prevent the outdoor heat exchanger from frosting and effectively improve the operational reliability of the heat pump system. When the ambient temperature is greater than the second preset ambient temperature, it indicates that the outdoor heat exchanger can absorb heat from the environment when switching to the evaporation state to facilitate the improvement of the heat storage rate. At this time, the target operation mode is further selected according to the state parameters, so as to achieve a balanced improvement of the indoor refrigeration effect and the heat storage efficiency.

[0112] Furthermore, in this embodiment, the second preset ambient temperature is greater than the first preset ambient temperature, and after the step of obtaining the ambient temperature and state parameters, it also includes: when the ambient temperature is greater than the first preset ambient temperature and less than the second preset ambient temperature, controlling the heat pump system to maintain the current operating mode.

[0113] When the current operation mode is the first operation mode, the heat pump system is controlled to maintain the first operation mode; when the current operation mode is the second operation mode, the heat pump system is controlled to maintain the second operation mode.

[0114] In this embodiment, when the ambient temperature is between the first preset ambient temperature and the second preset ambient temperature, the heat pump system maintains the current operating mode, which is beneficial to ensure the indoor cooling effect, the heat storage effect of the energy storage device, and the system operation reliability while improving the system operation stability.

[0115] Furthermore, in this embodiment, after step S30, the execution returns to step S10. During the operation of the heat pump system, when it is determined for the first time that the ambient temperature is greater than the first preset ambient temperature and less than the second preset ambient temperature, the heat pump system can be controlled to operate in the first operation mode; when it is not the first time to determine that the ambient temperature is greater than the first preset ambient temperature and less than the second preset ambient temperature, the heat pump system is controlled to maintain the current operation mode. Based on this, it is beneficial to further improve the reliability of system operation.

[0116] Further, based on any of the above embodiments, another embodiment of the control method of the heat pump system of the present application is proposed. In this embodiment, the state parameter includes at least one of the following parameters: the energy storage medium temperature, the condensing temperature and the energy demand ratio of the energy storage device, and the energy demand ratio is the ratio of the energy demand of the indoor unit to the energy demand of the energy storage device. The step of determining the target operation mode of the heat pump system according to the state parameter includes:

[0117] When the state parameter meets a first preset condition, the first operation mode is determined to be the target operation mode; when the state parameter meets a second preset condition, the second operation mode is determined to be the target operation mode.

[0118] The first preset condition or the second preset condition may include a target parameter range that a parameter needs to reach or a preset relationship that a state parameter needs to reach with a preset parameter.

[0119] The first preset condition includes at least one of the following conditions:

[0120] Condition 1: the energy storage medium temperature of the energy storage device is greater than or equal to a first preset medium temperature;

[0121] Condition 2: the condensing temperature of the heat pump system is greater than or equal to the preset temperature;

[0122] Condition 3: The energy demand ratio of the heat pump system is greater than or equal to the preset ratio, and the energy demand ratio is the ratio of the energy demand of the indoor unit to the energy demand of the energy storage device.

[0123] In this embodiment, the second preset condition includes at least one of the following conditions:

[0124] Condition 4: the energy storage medium temperature of the energy storage device is lower than the second preset medium temperature;

[0125] Condition 5: the condensing temperature of the heat pump system is lower than a preset temperature;

[0126] Condition 6: The energy demand ratio of the heat pump system is less than a preset ratio, and the energy demand ratio is the ratio of the energy demand of the indoor unit to the energy demand of the energy storage device.

[0127] The energy storage medium temperature is specifically detected by the above-mentioned temperature sensor. The first preset medium temperature and the second preset medium temperature are specifically critical values ​​for distinguishing the heat storage efficiency of the energy storage device. The second preset medium temperature is less than or equal to the first preset medium temperature. When the energy storage medium temperature is greater than or equal to the first preset medium temperature, the heat storage efficiency is high; when the energy storage medium temperature is less than the second preset medium temperature, the heat storage efficiency is low.

[0128] The condensing pressure is detected by a pressure sensor, and the saturation temperature corresponding to the condensing pressure is determined as the condensing temperature here. The preset temperature is a critical value of the condensing temperature used to distinguish whether the system is operating reliably. If the condensing temperature is less than the preset temperature, it indicates that the system is operating reliably; if the condensing temperature is greater than or equal to the preset temperature, it indicates that the system has a risk of reliability problems.

[0129] The energy demand ratio can be specifically determined by respectively determining the energy demand of the indoor unit and the energy demand of the energy storage device, and taking the ratio of the two energy demands as the energy demand ratio here. If the energy demand ratio is less than the preset ratio, it indicates that the cooling demand is smaller than the heat storage demand; if the energy demand ratio is greater than the preset ratio, it indicates that the cooling demand is greater than the heat storage demand.

[0130] The preset medium temperature, preset temperature and preset ratio may be pre-set fixed values, or may be values ​​determined according to the actual operation of the heat pump system. For example, the preset medium temperature, preset temperature and preset ratio may be determined according to the number of indoor units currently operating in cooling mode, the ambient temperature and the priority parameters between cooling and heat storage set by the user, and so on.

[0131] In this embodiment, the value range of the first preset medium temperature is 48°C to 56°C, for example: 53°C; the value range of the second preset medium temperature is 38°C to 48°C, for example: 45°C; the value range of the preset temperature is 57°C to 63°C, for example: 60°C; the value range of the preset ratio is 1 to 2.5, for example: 1.8.

[0132] In this embodiment, the state parameters include the energy storage medium temperature, the condensing temperature and the energy demand ratio, the first preset condition includes at least one of conditions 1, 2 and 3, and the second preset condition includes conditions 4, 5 and 6. When the energy storage medium temperature is less than the preset medium temperature, the condensing temperature is less than the preset temperature and the energy demand ratio is less than the preset ratio, the second operation mode is determined to be the target operation mode; when the energy storage medium temperature is greater than or equal to the preset medium temperature, or the condensing temperature is greater than or equal to the preset temperature, or the energy demand ratio is greater than or equal to the preset ratio, the first operation mode is determined to be the target operation mode.

[0133] In this embodiment, the above method can ensure that when the indoor cooling demand is high, the reliability risk is high, and the heat storage rate is good, the heat pump system operates in the first operating mode, and the outdoor heat exchanger is in a condensing state. While ensuring the heat storage efficiency, it is avoided that the outdoor heat exchanger is in an evaporating state to absorb too much heat, affecting the indoor cooling effect and the system operation reliability. Based on this, it is possible to ensure high heat storage efficiency while improving the indoor cooling effect and operation reliability; when the indoor cooling demand is low, the reliability risk is low, and the heat storage rate is low, the heat pump system operates in the second operating mode. The heat pump system operates in the second operating mode, and the outdoor heat exchanger is in an evaporating state, which is conducive to absorbing more heat from the environment to provide energy for the heat storage of the energy storage device, thereby improving the heat storage efficiency of the energy storage device on the basis of ensuring indoor cooling comfort and system operation reliability.

[0134] Furthermore, in this embodiment, when the second preset medium temperature is lower than the first preset medium temperature, and the state parameter does not satisfy the first preset condition and the second preset condition, that is, when the energy storage medium temperature is higher than or equal to the second preset medium temperature and the energy storage medium temperature is lower than the first preset medium temperature, the heat pump system can be controlled to maintain the current operating mode to effectively improve the operating stability of the heat pump system.

[0135] Further, based on any of the above embodiments, another embodiment of the control method of the heat pump system of the present application is proposed. In this embodiment, the state parameter includes an energy demand ratio, and the step of obtaining the state parameter includes: obtaining a first energy demand value of the indoor unit, obtaining a second energy demand value of the energy storage device; and determining the energy demand ratio according to the ratio of the first energy demand value to the second energy demand value.

[0136] The state parameters of the indoor unit itself and / or the detection data of the indoor space where the indoor unit is located are obtained to determine the first energy demand value.

[0137] The second energy requirement value is determined by acquiring state parameters of the energy storage device itself and / or data detected by a detection module provided on the energy storage device.

[0138] In one implementation, the ratio may be used directly as the energy demand ratio. In another implementation, the ratio may be corrected as the energy demand ratio.

[0139] Furthermore, in this embodiment, the step of obtaining the first energy requirement value of the indoor unit includes: obtaining the indoor temperature of the indoor space, the model of the indoor unit and the rotation speed of the indoor fan in the indoor unit; and determining the first energy requirement value based on the indoor temperature, the model and the rotation speed.

[0140] Different indoor temperatures, machine models, and rotation speeds correspond to different first energy demand values. Specifically, the corresponding relationship between the indoor temperature, machine model, rotation speed, and the first energy demand value can be preset, and the corresponding relationship can include a calculation formula, a mapping relationship, etc. Based on the corresponding relationship, the first energy demand value corresponding to the indoor temperature, machine model, and rotation speed can be determined. For example, the characteristic values ​​corresponding to the indoor temperature, machine model, and rotation speed can be substituted into the preset formula to calculate the first energy demand value here.

[0141] In this embodiment, the temperature difference between the indoor temperature and the set temperature of the indoor unit is determined; a baseline energy requirement value is determined based on the temperature difference value, a first correction value is determined based on the machine model, and a second correction value is determined based on the rotation speed; the baseline energy requirement value is corrected based on the first correction value and the second correction value to obtain the first energy requirement value.

[0142] The benchmark energy requirement value is positively correlated with the temperature difference value, that is, the greater the temperature difference, the greater the benchmark energy requirement value, and the smaller the temperature difference value, the smaller the benchmark energy requirement value. The correspondence between the benchmark energy requirement value and the temperature difference value can be preset, or it can be obtained according to the actual operation of the heat pump system. In this embodiment, the target correspondence between the benchmark energy requirement value and the temperature difference value is obtained according to the temperature change trend of the indoor space where the indoor unit is located. When the change trend is a downward trend, the first correspondence is determined as the target correspondence; when the change trend is an upward trend, the second correspondence is determined as the target correspondence, and the benchmark energy requirement value corresponding to the same temperature difference value in the first correspondence is greater than the benchmark energy requirement value corresponding to the temperature difference value in the second correspondence.

[0143] In this embodiment, the temperature difference interval in which the temperature difference value is located is determined, and the reference energy demand value is determined according to the temperature difference interval. For example, the corresponding relationship between the temperature difference value and the temperature difference interval is as follows: Fig.10 The corresponding relationship between the temperature difference range and the reference energy demand value is shown in Table 1:

[0144] Temperature range Area A Zone B Zone C D Zone Zone E f zone Baseline Energy Demand 3 2 1.5 1 0.5 0

[0145] Table 1

[0146] For example: when in interval d, if T1-TS>2℃, it becomes interval c; when in interval d, if T1-TS<0℃, it becomes interval e.

[0147] The first correction value is positively correlated with the rated cooling capacity corresponding to the model, that is, the smaller the rated cooling capacity corresponding to the model, the smaller the first correction value, and the larger the rated cooling capacity corresponding to the model, the larger the first correction value. For example, if the first correction value is defined as HP, then the HP of the 20 machine is 0.8; the HP of the 26 machine is 1.0; the HP of the 32 / 35 machine is 1.2; the HP of the 48 / 53 machine is 1.5; the HP of the 70 machine is 2.5.

[0148] Different rotation speeds correspond to different second correction values, and the rotation speed is positively correlated with the second correction value, that is, the greater the fan rotation speed, the greater the second correction value, and the smaller the fan rotation speed, the smaller the second correction value.

[0149] In this embodiment, the energy demand value of each indoor unit=reference energy demand value*first correction value*second correction value.

[0150] When the number of indoor units with cooling demand is one, the energy demand value of the indoor unit with cooling demand can be used as the first energy demand value. When the number of indoor units with cooling demand is more than one, the sum of the energy demand values ​​of all indoor units with cooling demand can be used as the first energy demand value.

[0151] In this embodiment, the above method can ensure that the determined first energy demand value can accurately reflect the accuracy of the refrigeration demand of the heat pump system, so as to improve the accuracy of the target operation mode selection and achieve a balanced improvement in the refrigeration effect, heat storage effect and system operation reliability.

[0152] Furthermore, in this embodiment, the step of obtaining the second energy requirement value of the energy storage device includes: obtaining the energy storage medium temperature of the energy storage device, the outdoor ambient temperature corresponding to the heat pump system, and the rated energy requirement value of the energy storage device; determining an energy requirement correction value based on the energy storage medium temperature and the outdoor ambient temperature; and determining the second energy requirement value based on the energy requirement correction value and the rated energy requirement value of the energy storage device.

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

[0154] The temperature of the energy storage medium is detected by the above-mentioned temperature sensor. The outdoor environment temperature is detected by the above-mentioned environment sensor.

[0155] Different energy storage medium temperatures and different outdoor ambient temperatures correspond to different energy demand correction values. The energy demand correction value is negatively correlated with the outdoor ambient temperature, and the energy demand correction value is negatively correlated with the energy storage medium temperature.

[0156] Specifically, a correspondence between the energy storage medium temperature, the outdoor ambient temperature and the energy demand correction value can be established in advance. The correspondence may include a calculation formula, a mapping relationship, etc. Based on the correspondence, the energy demand correction value corresponding to the current energy storage medium temperature and the outdoor ambient temperature can be determined.

[0157] Furthermore, more than one correspondence relationship between the energy storage medium temperature, the outdoor ambient temperature and the energy demand correction value can be pre-set, and a target correspondence relationship can be determined in more than one correspondence relationship based on the operating speed of the outdoor fan corresponding to the outdoor heat exchanger and the temperature difference between the energy storage medium temperature and the target temperature, and the energy demand correction value corresponding to the current energy storage medium temperature and the outdoor ambient temperature is determined based on the target correspondence relationship.

[0158] For example, the corresponding relationship between the outdoor environment temperature T4, the energy storage medium temperature Tw and the energy demand correction value Aw is shown in Table 2 below:

[0159]

[0160]

[0161] Table 2

[0162] Based on this, by determining the interval of the outdoor ambient temperature in the above table and the interval of the energy storage medium temperature in the above table, the value obtained by matching the two intervals is used as the energy demand correction value.

[0163] In this embodiment, the product of the energy requirement correction value and the rated energy requirement value is determined as the second energy requirement value.

[0164] In this embodiment, the operating conditions of the preset mode can be accurately reflected by combining the outdoor ambient temperature and the energy storage medium temperature. Therefore, the energy demand correction value is determined according to the outdoor ambient temperature and the energy storage medium temperature, which is conducive to ensuring that the energy demand correction value can accurately reflect the actual energy demand of the energy storage device under the current working conditions. The second energy demand value of the energy storage device is determined in combination with the energy demand correction value and the rated energy demand value, which is conducive to ensuring that the determined second energy demand value can accurately reflect the capacity demand of the energy storage device in the initial stage, and is conducive to further improving the accuracy of the target operating mode selection, thereby further achieving the improvement of the refrigeration effect, the heat storage effect and the system operation reliability.

[0165] In other embodiments, the energy demand correction value may be determined based on one of the outdoor ambient temperature and the energy storage medium temperature, or based on other parameters other than the outdoor ambient temperature and the energy storage medium temperature. The other parameters here may be, for example, the temperature difference between the energy storage medium temperature and the set medium temperature of the energy storage device and / or the temperature change rate of the outdoor heat exchanger and / or the temperature difference between the inner surface temperature and the outer surface temperature of the energy storage device and / or the temperature difference change rate between the inner surface temperature and the outer surface temperature of the energy storage device, and / or the temperature difference change rate between the inner surface temperature and the outer surface temperature of the energy storage device, and the like.

[0166] Furthermore, in this embodiment, the step of obtaining the rated energy requirement of the energy storage device includes: obtaining the volume of the energy storage device for storing the energy storage medium; and determining the rated energy requirement according to the volume. The volume is positively correlated with the rated energy requirement.

[0167] For example, the volume and rated energy demand values ​​can be shown in Table 3 below:

[0168] Volume / L Rated energy demand Hw / kW 150 2.8 200 3.6

[0169] Table 3

[0170] In this embodiment, the rated energy requirement is determined according to the volume of the energy storage device, which is conducive to accurately reflecting the energy requirement required by the energy storage device's own properties during the energy storage process, thereby facilitating further improving the accuracy of the compressor frequency operation control and improving the energy storage efficiency of the energy storage device.

[0171] In other embodiments, the rated energy requirement value here may also be determined according to the shell thickness and material type of the energy storage device.

[0172] Furthermore, based on any of the above embodiments, yet another embodiment of the control method of the heat pump system of the present application is proposed. In this embodiment, the indoor unit includes an indoor heat exchanger and a first throttling device, the refrigerant main circuit also includes a compressor, a reversing assembly and a second throttling device, the indoor heat exchanger, the first throttling device, the second throttling device and the outdoor heat exchanger are connected in sequence, the indoor heat exchanger, the outdoor heat exchanger, the exhaust port of the compressor, and the return air port of the compressor are all connected to the reversing assembly, the pipeline between the first throttling device and the second throttling device is connected to one end of the refrigerant branch, and the other end of the refrigerant branch is connected to the reversing assembly or the exhaust port of the compressor, and the step of controlling the heat pump system to operate the target operating mode includes: when the target operating mode is the first operating mode, controlling the reversing assembly to operate so that the outdoor heat exchanger and the energy storage device are both connected to the exhaust port, and the indoor heat exchanger is connected to the return air port; when the target operating mode is the second operating mode, controlling the reversing assembly to operate so that the indoor heat exchanger and the outdoor heat exchanger are both connected to the return air port, and the energy storage device is connected to the exhaust port.

[0173] In an implementation of this embodiment, the reversing assembly includes a first reversing valve, a second reversing valve and a switching valve, the exhaust port, the return air port and the indoor heat exchanger are all connected to the first reversing valve, the exhaust port, the return air port and the outdoor heat exchanger are all connected to the second reversing valve, and the exhaust port, the return air port and the refrigerant branch are all connected to the switching valve, then:

[0174] The step of controlling the reversing assembly to operate so that the outdoor heat exchanger and the energy storage device are both connected to the exhaust port, and the indoor heat exchanger is connected to the return air port when the target operation mode is the first operation mode comprises: when the target operation mode is the first operation mode, controlling the first reversing valve to operate in a first valve position so that the return air port is connected to the indoor heat exchanger, controlling the second reversing valve to operate in a third valve position so that the exhaust port is connected to the outdoor heat exchanger, and controlling the switching valve to operate in a second switching state so that the exhaust port is connected to the energy storage device;

[0175] The step of controlling the reversing assembly to operate so that the indoor heat exchanger and the outdoor heat exchanger are both connected to the return air port, and the energy storage device is connected to the exhaust port when the target operating mode is the second operating mode includes: when the target operating mode is the second operating mode, controlling the first reversing valve to operate in a first valve position so that the return air port is connected to the indoor heat exchanger, controlling the second reversing valve to operate in a fourth valve position so that the return air port is connected to the outdoor heat exchanger, and controlling the switching valve to operate in a second switching state so that the exhaust port is connected to the energy storage device.

[0176] In another implementation of this embodiment, the reversing assembly includes a first reversing valve and a second reversing valve, the exhaust port, the return air port and the indoor heat exchanger are all connected to the first reversing valve, the exhaust port, the return air port and the outdoor heat exchanger are all connected to the second reversing valve, and the refrigerant branch is connected to the exhaust port of the compressor, then when the target operation mode is the first operation mode, the step of controlling the reversing assembly to operate so that the outdoor heat exchanger and the energy storage device are both connected to the exhaust port, and the indoor heat exchanger is connected to the return air port includes: when the target operation mode is the first operation mode, controlling the first reversing valve to operate in a first valve position so that the return air port is connected to the indoor heat exchanger, and controlling the second reversing valve to operate in a third valve position so that the exhaust port is connected to the outdoor heat exchanger;

[0177] The step of controlling the reversing assembly to operate so that the indoor heat exchanger and the outdoor heat exchanger are both connected to the return air port, and the energy storage device is connected to the exhaust port when the target operating mode is the second operating mode includes: when the target operating mode is the second operating mode, controlling the first reversing valve to operate in the first valve position so that the return air port is connected to the indoor heat exchanger, and controlling the second reversing valve to operate in the fourth valve position so that the return air port is connected to the outdoor heat exchanger.

[0178] In addition, an embodiment of the present invention further proposes a storage medium, on which a control program of a heat pump system is stored. When the control program of the heat pump system is executed by a processor, the relevant steps of any embodiment of the control method of the heat pump system are implemented.

[0179] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or system. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or system including the element.

[0180] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0181] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, including a number of instructions for a terminal device (which can be a mobile phone, computer, server, heat pump system, or network device, etc.) to execute the methods described in each embodiment of the present invention.

[0182] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A control method for a heat pump system, characterized in that: The heat pump system comprises a refrigerant main circuit and a refrigerant branch circuit connected to the refrigerant main circuit, the refrigerant main circuit comprises an indoor unit and an outdoor heat exchanger, the refrigerant branch circuit comprises an energy storage device, and the control method of the heat pump system comprises the following steps: Acquiring an ambient temperature and a state parameter, wherein the state parameter indicates a cooling state of the indoor unit and a heat storage state of the energy storage device; Determining a target operation mode of the heat pump system according to the ambient temperature and the state parameter; Controlling the heat pump system to operate in the target operation mode; Among them, the target operating mode includes a first operating mode or a second operating mode, the first operating mode corresponds to the indoor unit being in a cooling state, the energy storage device being in a heat storage state, and the outdoor heat exchanger being in a condensing state, and the second operating mode corresponds to the indoor unit being in a cooling state, the energy storage device being in a heat storage state, and the outdoor heat exchanger being in an evaporating state.

2. The control method of the heat pump system according to claim 1, characterized in that: The step of determining the target operation mode of the heat pump system according to the ambient temperature and the state parameter comprises: When the ambient temperature is less than or equal to a first preset ambient temperature, determining the first operating mode as the target operating mode; When the ambient temperature is greater than a second preset ambient temperature, determining the target operation mode of the heat pump system according to the state parameter; Wherein, the second preset ambient temperature is greater than or equal to the first preset ambient temperature.

3. The control method of the heat pump system according to claim 2, characterized in that: The second preset ambient temperature is greater than the first preset ambient temperature, and after the step of obtaining the ambient temperature and the state parameter, the method further includes: When the ambient temperature is greater than the first preset ambient temperature and less than the second preset ambient temperature, the heat pump system is controlled to maintain the current operation mode.

4. The control method of the heat pump system according to claim 2, characterized in that: The step of determining the target operation mode of the heat pump system according to the state parameter comprises: When the state parameter satisfies a first preset condition, determining the first operation mode as the target operation mode; The first preset condition includes at least one of the following conditions: The energy storage medium temperature of the energy storage device is greater than or equal to the first preset medium temperature; The condensing temperature of the heat pump system is greater than or equal to the preset temperature; The energy demand ratio of the heat pump system is greater than or equal to the preset ratio, and the energy demand ratio is the ratio of the energy demand of the indoor unit to the energy demand of the energy storage device.

5. The control method of the heat pump system according to claim 2, characterized in that: The step of determining the target operation mode of the heat pump system according to the state parameter comprises: When the state parameter satisfies a second preset condition, determining the second operating mode as the target operating mode; The second preset condition includes at least one of the following conditions: The energy storage medium temperature of the energy storage device is lower than the second preset medium temperature; The condensing temperature of the heat pump system is lower than a preset temperature; The energy demand ratio of the heat pump system is less than a preset ratio, and the energy demand ratio is a ratio of the energy demand of the indoor unit to the energy demand of the energy storage device.

6. The control method of the heat pump system according to claim 1, characterized in that: The step of obtaining the state parameter comprises: Acquire a first energy requirement value of the indoor unit, and acquire a second energy requirement value of the energy storage device; An energy demand ratio is determined according to a ratio of the first energy demand value to the second energy demand value, and the state parameter includes the energy demand ratio.

7. The control method of the heat pump system according to claim 6, characterized in that: The step of obtaining the first energy demand value of the indoor unit comprises: Acquire the indoor temperature of the indoor space, the model of the indoor unit, and the rotation speed of the indoor fan in the indoor unit; The first energy requirement value is determined according to the indoor temperature, the machine model, and the rotation speed.

8. The control method of the heat pump system according to claim 7, characterized in that: The step of determining the first energy demand value according to the indoor temperature, the machine type and the rotation speed comprises: Determining a temperature difference between the indoor temperature and a set temperature of the indoor unit; Determine a reference energy requirement value according to the temperature difference value, determine a first correction value according to the machine type, and determine a second correction value according to the rotation speed; The reference energy requirement value is corrected according to the first correction value and the second correction value to obtain the first energy requirement value.

9. The control method of the heat pump system according to claim 6, characterized in that: The step of obtaining the second energy requirement value of the energy storage device comprises: Acquire the energy storage medium temperature of the energy storage device, the outdoor environment temperature corresponding to the heat pump system, and the rated energy demand value of the energy storage device; Determining an energy demand correction value according to the energy storage medium temperature and the outdoor ambient temperature; The second energy requirement value is determined according to the energy requirement correction value and the rated energy requirement value of the energy storage device.

10. The control method of the heat pump system according to claim 9, characterized in that: The step of obtaining the rated energy demand value of the energy storage device comprises: Obtaining the volume of the energy storage device for storing energy storage medium; The rated energy demand is determined based on the volume.

11. The control method of a heat pump system according to any one of claims 1 to 10, characterized in that: The indoor unit includes an indoor heat exchanger and a first throttling device, the refrigerant main circuit also includes a compressor, a reversing assembly and a second throttling device, the indoor heat exchanger, the first throttling device, the second throttling device and the outdoor heat exchanger are connected in sequence, the indoor heat exchanger, the outdoor heat exchanger, the exhaust port of the compressor, and the return air port of the compressor are all connected to the reversing assembly, the pipeline between the first throttling device and the second throttling device is connected to one end of the refrigerant branch, and the other end of the refrigerant branch is connected to the reversing assembly or the exhaust port of the compressor, and the step of controlling the heat pump system to operate the target operation mode includes: When the target operation mode is the first operation mode, controlling the reversing assembly to operate so that the outdoor heat exchanger and the energy storage device are both connected to the exhaust port, and the indoor heat exchanger is connected to the return air port; When the target operation mode is the second operation mode, the reversing assembly is controlled to operate so that both the indoor heat exchanger and the outdoor heat exchanger are connected to the return air port, and the energy storage device is connected to the exhaust port.

12. The control method of the heat pump system according to claim 11, characterized in that: The reversing assembly includes a first reversing valve, a second reversing valve and a switching valve, the exhaust port, the return air port and the indoor heat exchanger are all connected to the first reversing valve, the exhaust port, the return air port and the outdoor heat exchanger are all connected to the second reversing valve, the exhaust port, the return air port and the refrigerant branch are all connected to the switching valve, and when the target operation mode is the first operation mode, the step of controlling the reversing assembly to operate so that the outdoor heat exchanger and the energy storage device are all connected to the exhaust port, and the indoor heat exchanger is connected to the return air port includes: When the target operation mode is the first operation mode, the first reversing valve is controlled to operate in a first valve position so that the return air port is connected to the indoor heat exchanger, the second reversing valve is controlled to operate in a third valve position so that the exhaust port is connected to the outdoor heat exchanger, and the switching valve is controlled to operate in a second switching state so that the exhaust port is connected to the energy storage device; When the target operation mode is the second operation mode, the step of controlling the reversing assembly to operate so that both the indoor heat exchanger and the outdoor heat exchanger are connected to the return air port, and the energy storage device is connected to the exhaust port comprises: When the target operating mode is the second operating mode, the first reversing valve is controlled to operate in the first valve position to connect the return air port with the indoor heat exchanger, the second reversing valve is controlled to operate in the fourth valve position to connect the return air port with the outdoor heat exchanger, and the switching valve is controlled to operate in the second switching state to connect the exhaust port with the energy storage device.

13. A heat pump system, characterized in that: The heat pump system comprises a control device, a refrigerant main circuit and a refrigerant branch circuit connected to the refrigerant main circuit, the refrigerant main circuit comprises an indoor heat exchanger and an outdoor heat exchanger, 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 12 are implemented.

14. A storage medium, characterized in that: The storage medium stores a control program of the heat pump system, and when the control program of the heat pump system is executed by the processor, the steps of the control method of the heat pump system according to any one of claims 1 to 12 are implemented.

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