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

Abstract

The invention discloses a control method of a heat pump system, the heat pump system and a storage medium. The heat pump system comprises a refrigerant main path and a refrigerant branch path connected with the refrigerant main path, the refrigerant main path comprises more than one indoor unit and an outdoor unit, the refrigerant branch path comprises an energy storage device, and the method comprises the steps that the running state of each indoor unit and the energy requirement state corresponding to the energy storage device are obtained, the running state comprises whether the corresponding indoor unit starts a heat exchange mode or not, and the energy demand state comprises whether the energy storage device has energy demand or not; determining a target operation mode of the outdoor unit according to more than one operation state and the energy demand state; and controlling the outdoor unit to operate according to the target operation mode. The invention aims to improve the operation flexibility of the outdoor unit so as to meet different indoor use requirements.

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 regulating the indoor air, the heat pump system is also equipped with energy storage devices to meet other energy needs. Among them, in a one-to-many heat pump system, the operating conditions are complex, and the use requirements of the heat pump system are different under different working conditions. It is difficult for the outdoor unit to meet different use requirements by operating in a fixed mode. 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 flexibility of outdoor unit operation to meet different indoor usage requirements.

[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 more than one indoor unit and outdoor unit, the refrigerant branch circuit comprising an energy storage device, and the control method for the heat pump system comprising the following steps:

[0005] Acquire the operating state of each indoor unit and the energy demand state corresponding to the energy storage device, wherein the operating state includes whether the corresponding indoor unit is in a heat exchange mode, and the energy demand state includes whether the energy storage device has energy demand;

[0006] determining a target operation mode of the outdoor unit according to more than one of the operation states and the energy demand state;

[0007] The outdoor unit is controlled to operate according to the target operation mode.

[0008] Optionally, the step of determining the target operating mode of the outdoor unit according to more than one of the operating states and the energy demand state comprises:

[0009] When at least one of the indoor units turns on the heat exchange mode and the energy storage device has energy demand, determining the first operation mode as the target operation mode so that the turned-on indoor unit is in a target heat exchange state corresponding to the heat exchange mode and the energy storage device is in a target energy storage state corresponding to the energy demand;

[0010] When at least one of the indoor units turns on the heat exchange mode and the energy storage device has no energy demand, determining the second operation mode as the target operation mode, so that the turned-on indoor unit is in a target heat exchange state corresponding to the heat exchange mode and the energy storage device is in a stopped energy storage state;

[0011] When all the indoor units have not started the heat exchange mode and the energy storage device has energy demand, determining the third operation mode as the target operation mode to stop the heat exchange of the indoor units and the energy storage device is in the target energy storage state;

[0012] When all the indoor units have not started the heat exchange mode and the energy storage device has no energy demand, the fourth operation mode is determined as the target operation mode to stop the outdoor unit.

[0013] Optionally, the heat exchange mode includes a cooling mode or a heating mode, and when at least one of the indoor units turns on the heat exchange mode and the energy storage device has energy demand, the step of determining the first operating mode as the target operating mode includes:

[0014] When at least one of the indoor units starts the cooling mode, at least one of the indoor units starts the heating mode, and the energy storage device has energy demand, the first operating mode is determined according to the priorities corresponding to the cooling mode and the heating mode, and the first operating mode is the target operating mode.

[0015] Optionally, the heat exchange mode includes a cooling mode or a heating mode, and when at least one of the indoor units turns on the heat exchange mode and the energy storage device has no energy demand, the step of determining the second operating mode as the target operating mode includes:

[0016] When at least one of the indoor units starts the cooling mode, at least one of the indoor units starts the heating mode, and the energy storage device has no energy demand, the second operating mode is determined according to the priorities corresponding to the cooling mode and the heating mode, and the second operating mode is the target operating mode.

[0017] Optionally, during or after the step of controlling the operation of the outdoor unit according to the target operation mode, the step further includes:

[0018] When the target operation mode is the first operation mode, and the indoor unit in the heat exchange mode reaches the temperature and stops, controlling the outdoor unit to operate in the third operation mode;

[0019] When the target operation mode is the first operation mode and the energy storage temperature of the energy storage device reaches a set energy storage temperature, the outdoor unit is controlled to operate in the second operation mode.

[0020] Optionally, the target heat exchange state includes a heating state, the target energy storage state includes a heat storage state, the first operation mode includes a first sub-mode and a second sub-mode, and the step of controlling the operation of the outdoor unit according to the target operation mode includes:

[0021] When the target operation mode is the first operation mode, continuously monitoring the energy storage temperature of the energy storage device;

[0022] When the energy storage temperature is lower than a first preset temperature, controlling the outdoor unit to operate in a first sub-mode so that the energy storage device is in a heat storage state and the indoor unit stops indoor heat exchange;

[0023] When the energy storage temperature is greater than the second preset temperature, controlling the outdoor unit to operate in a second sub-mode so that the energy storage device is in a heat storage state and the indoor unit is in a heating state;

[0024] 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, the outdoor unit is controlled to maintain operation in a current state.

[0025] Optionally, the control method of the heat pump system further includes:

[0026] When the target operation mode is the first operation mode, the indoor unit in the heat exchange mode is controlled to output prompt information when the outdoor unit is operating in the first sub-mode to prompt that there is a conflict between the operation of the indoor unit and the operation of the outdoor unit.

[0027] Optionally, the control method of the heat pump system further includes:

[0028] When the outdoor unit needs to switch to the second target mode during operation of the first target mode, the compressor of the outdoor unit is controlled to remain turned on or stopped according to the indoor unit state and / or the state of the energy storage device corresponding to the first target mode and the second target mode respectively;

[0029] Controlling the outdoor unit to switch to the second target mode;

[0030] Among them, one of the first target mode and the second target mode is the target operation mode.

[0031] Optionally, the step of controlling the compressor of the outdoor unit to maintain startup or shutdown according to the indoor unit states and / or the state of the energy storage device corresponding to the first target mode and the second target mode respectively includes:

[0032] When the target heat exchange states of the indoor units respectively corresponding to the first target mode and the second target mode are opposite, controlling the compressor of the outdoor unit to stop;

[0033] When the energy storage device corresponding to one of the first target mode and the second target mode is in a heat storage state and the indoor unit stops heat exchange, and the indoor unit corresponding to the other of the first target mode and the second target mode is in a cooling state, controlling the compressor of the outdoor unit to stop;

[0034] When the target heat exchange states of the indoor units respectively corresponding to the first target mode and the second target mode are the same, controlling the compressor of the outdoor unit to remain turned on;

[0035] When the energy storage device corresponding to one of the first target mode and the second target mode is in a heat storage state and the indoor unit stops heat exchange, and the other indoor unit corresponding to the first target mode and the second target mode is in a heating state, the compressor of the outdoor unit is controlled to remain turned on.

[0036] 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 more than one indoor unit and outdoor unit, and the refrigerant branch circuit comprising an energy storage device;

[0037] The indoor unit and the outdoor unit are both connected to the control device, which includes: a memory, a processor, and a control program for the heat pump system stored in the memory and executable on the processor. When the control program for the heat pump system is executed by the processor, the steps of the control method for the heat pump system as described in any one of the above items are implemented.

[0038] 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.

[0039] The present invention proposes a control method for a heat pump system, in which a refrigerant main circuit of the heat pump system includes more than one indoor unit and outdoor unit, and a refrigerant branch circuit connected to the refrigerant main circuit includes an energy storage device. The method is suitable for determining a target operating mode to control the operation of the outdoor unit based on whether a heat exchange mode is turned on for each indoor unit and whether the energy storage device has energy requirements, so that the operating mode of the outdoor unit is no longer fixed, and can effectively meet the indoor heat exchange requirements of different indoor spaces and the use requirements of the energy storage device, thereby improving the flexibility of the outdoor unit operation to meet different usage requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 A schematic diagram of the refrigerant pipeline structure of an embodiment of a heat pump system of the present invention and a schematic diagram of the refrigerant flow direction in the first mode;

[0041] Figure 2A schematic diagram of the refrigerant pipeline structure of an embodiment of a heat pump system of the present invention and a schematic diagram of the refrigerant flow direction in the second mode;

[0042] Figure 3 A schematic diagram of the refrigerant pipeline 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;

[0043] Figure 4 A schematic diagram of the refrigerant pipeline 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;

[0044] Figure 5 A schematic diagram of the refrigerant pipeline structure of an embodiment of a heat pump system of the present invention and a schematic diagram of the refrigerant flow direction in the fifth mode;

[0045] Figure 6 A schematic diagram of the refrigerant pipeline 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;

[0046] Figure 7 A schematic diagram of the hardware structure involved in the operation of an embodiment of a heat pump system of the present invention;

[0047] Figure 8 A schematic flow chart of an embodiment of a control method for a heat pump system of the present invention;

[0048] Fig. 9 A schematic flow chart of another embodiment of a control method for a heat pump system of the present invention;

[0049] Fig.10 A schematic flow chart of another embodiment of a control method for a heat pump system of the present invention;

[0050] Fig.11 A schematic flow chart of another embodiment of a control method for a heat pump system of the present invention;

[0051] Fig.12 The figure is a flow chart of another optional embodiment of the control method of the heat pump system of the present invention.

[0052] 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

[0053] 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.

[0054] An embodiment of the present invention provides a heat pump system.

[0055] In the embodiment of the present invention, refer to Figures 1 to 7The 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 throttling device 4 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 throttling device 4 and the first control valve 8 are all connected to the control device 100. The heat pump system also includes an outdoor unit, which includes the outdoor heat exchanger 3, the throttling device 4, the reversing component 5 and the first control valve 8. The throttling device 4 and the first control valve 8 can be electronic expansion valves.

[0056] In this embodiment, the energy storage device 7 includes a water tank. In other embodiments, the energy storage device 7 may also include other types of devices with energy storage functions. When the refrigerant in the refrigerant branch flows through the energy storage device 7, it can exchange heat with the energy storage material therein, and the energy storage material can absorb and store the energy flowing through the refrigerant.

[0057] 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 throttling device 4 and the indoor unit is connected to the other end of the refrigerant branch.

[0058] In other embodiments, the heat pump system may also be provided with a flow direction regulating member, the pipeline between the indoor unit and the outdoor heat exchanger 3 is connected to the second end of the refrigerant branch, the return air port of the compressor 1, the exhaust port of the compressor 1 and the first end of the refrigerant branch are all connected to the flow direction regulating member, and the refrigerant branch is switched between two states of being connected to the return air port of the compressor 1 and being connected to the exhaust port of the compressor 1 through the flow direction regulating member. The refrigerant branch is connected to the exhaust port of the compressor 1 through one end of the refrigerant branch.

[0059] 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.

[0060] The indoor unit includes an indoor heat exchanger 21 and a second control valve 22 connected in series with the indoor heat exchanger 21. The second control valve 22 is connected to the control device 100, and the control device 100 can be used to control the refrigerant flow through the indoor heat exchanger 21. The second control valve 22 can be an electronic expansion valve.

[0061] The indoor unit, the throttling device 4 and the outdoor heat exchanger 3 are connected in sequence, and the pipeline between the 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] In some embodiments, the reversing assembly 5 may further include a switching valve (not shown), and the reversing assembly 5 (switching valve) may 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 switching valve may be a three-way valve or a four-way valve, and the switching valve includes a first switching state and a second switching state; when the switching valve 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 is in the second switching state, the exhaust port of the compressor 1 is connected to the energy storage device 7.

[0066] Through the regulation of the first reversing valve 51, the second reversing valve 52, the first control valve 8 and the second control valve 22, the operation modes of the heat pump system include but are not limited to the following modes:

[0067] 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 second control valve 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 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 store heat separately.

[0068] 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 second control valve 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 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 throttling device 4 and 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 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 returned to the compressor 1 while the energy storage device 7 stores heat.

[0069] 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 second control valve 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 throttling device 4 and the outdoor heat exchanger 3 in turn and then flows back to the compressor 1. The other part of the refrigerant flowing out of the refrigerant branch flows through the second control valve 22 and the indoor heat exchanger 21 in turn 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.

[0070] 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 second control valve 22 is opened. The refrigerant discharged from the compressor 1 flows through the outdoor heat exchanger 3, the throttling device 4, the second control valve 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.

[0071] 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 second control valve 22 is opened. The refrigerant discharged from the compressor 1 flows through the indoor heat exchanger 21, the second control valve 22, the 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.

[0072] 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 second control valve 22 is opened. A part of the refrigerant discharged from the compressor 1 flows through the indoor heat exchanger 21, the second control valve 22, the 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 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.

[0073] 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.

[0074] Further, see Figure 7 The heat pump system further includes an environment sensor 01 , which can be disposed at the return air outlet of the indoor unit to detect the indoor temperature of the corresponding indoor space. The environment sensor 01 is connected to the control device 100 .

[0075] Further, see Figure 7 The heat pump system further includes a temperature detection module 02, which is connected to the control device 100. The temperature detection module 02 can be arranged inside the energy storage device 7 to detect the temperature of the energy storage device 7.

[0076] In the embodiment of the present invention, refer to Figure 7 The 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.

[0077] Those skilled in the art will understand that Figure 7The 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.

[0078] like Figure 7 As shown, the memory 1002 as a computer storage medium may include a control program for the heat pump system.

[0079] 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.

[0080] An embodiment of the present invention further provides a control method for a heat pump system, which is applied to the above-mentioned heat pump system.

[0081] 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:

[0082] Step S10, obtaining the operating state of each indoor unit and the energy demand state corresponding to the energy storage device, wherein the operating state includes whether the corresponding indoor unit is in a heat exchange mode, and the energy demand state includes whether the energy storage device has energy demand;

[0083] The heat exchange mode includes a cooling mode or a heating mode.

[0084] The opening and closing of the heat exchange mode and the energy demand mode corresponding to different indoor units are independently regulated. After receiving the opening instruction of the heat exchange mode, the indoor unit can turn on the heat exchange mode; when receiving the closing instruction of the heat exchange mode, the indoor unit can turn off the heat exchange mode.

[0085] When the energy demand device corresponding to the energy storage device is turned on, it indicates that the energy storage device has energy demand; when the energy demand device corresponding to the energy storage device is turned off, it indicates that the energy storage device has no energy demand. For example, the energy storage device is a water tank, and the energy demand device can be a water heater. When the water heater is turned on, the water heater has energy demand for the water tank, and the hot water stored in the water tank can be used. The energy demand device can be turned on or off according to the instructions received by the indoor unit.

[0086] Step S20, determining a target operation mode of the outdoor unit according to more than one of the operation states and the energy demand state;

[0087] Different operating states and different energy demand states of more than one indoor unit may correspond to different target operating modes of the outdoor unit. The outdoor unit may include a throttling device, a reversing component, a compressor, an outdoor heat exchanger, and an outdoor fan corresponding to the outdoor heat exchanger. The opening corresponding to the throttling device in different target operating modes and / or the operating state of the reversing component and / or the operating frequency of the compressor and / or the operating speed of the outdoor fan are different, or the throttling device and / or the reversing component and / or the compressor and / or the outdoor fan in different target operating modes are used to meet the indoor heat exchange requirements of different indoor units and / or the energy requirements of the energy storage device. Different target operating modes correspond to different energies provided to the indoor units.

[0088] When there is a conflict between the modes turned on by more than one indoor unit, the target heat exchange mode can be determined according to the priority between the more than one indoor unit and / or the priority between the different modes turned on by more than one indoor unit, and the target operation mode of the outdoor unit can be determined according to the target heat exchange mode and the energy demand state. When there is no conflict between the modes turned on by more than one indoor unit, the mode of the indoor unit that meets the needs of all indoor units among all the turned-on modes can be determined as the target heat exchange mode, and the target operation mode of the outdoor unit can be determined according to the target heat exchange mode and the energy demand state.

[0089] Step S30: Controlling the outdoor unit to operate according to the target operation mode.

[0090] The operation of the compressor, throttling device, outdoor fan and reversing component in the outdoor unit is controlled according to the control logic corresponding to the target operation mode.

[0091] A control method for a heat pump system is proposed in an embodiment of the present invention. The refrigerant main circuit of the heat pump system includes more than one indoor unit and outdoor unit. The refrigerant branch circuit connected to the refrigerant main circuit includes an energy storage device. The method is suitable for determining a target operating mode to control the operation of the outdoor unit based on whether a heat exchange mode is turned on for each indoor unit and whether the energy storage device has energy. The operating mode of the outdoor unit is no longer fixed, and the indoor heat exchange requirements of different indoor spaces and the use requirements of the energy storage device can be effectively met, thereby improving the flexibility of the outdoor unit operation to meet different usage requirements.

[0092] Further, based on the above embodiment, 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 S20 comprises:

[0093] Step S21, when at least one of the indoor units turns on the heat exchange mode and the energy storage device has energy demand, determining the first operation mode as the target operation mode, so that the turned-on indoor unit is in a target heat exchange state corresponding to the heat exchange mode and the energy storage device is in a target energy storage state corresponding to the energy demand;

[0094] The first operation mode here may include the second mode or the third mode or the sixth mode mentioned above. In the first operation mode, the compressor is in the on state, the first control valve is open, the second control valve in the indoor unit that has the heat exchange mode turned on and the corresponding heat exchange demand matches the target heat exchange state corresponding to the first operation mode is opened, and the second control valve in the indoor unit that has not turned on the heat exchange mode or the second control valve in the indoor unit that has the heat exchange mode turned on and the corresponding heat exchange demand matches the target heat exchange state corresponding to the first operation mode is closed or operates at a standby opening. When the heat exchange mode turned on by at least one indoor unit is the cooling mode, the target heat exchange state is the cooling state, and when the heat exchange mode turned on by at least one indoor unit is the heating mode, the target heat exchange state is the heating state.

[0095] In one implementation of this embodiment, when all indoor units in heat exchange mode have the same heat exchange mode turned on, and all are in cooling mode, and the energy storage device has energy demand, the second mode and / or the third mode mentioned above can be determined as the first operating mode here. Among them, when the indoor heat exchange demand is greater than the energy demand corresponding to the energy storage device, the second mode can be determined as the first operating mode; when the indoor heat exchange demand is less than the energy demand corresponding to the energy storage device, the third mode can be determined as the first operating mode. In addition, when all indoor units in heat exchange mode have the same heat exchange mode turned on, and all are in cooling mode, and the energy storage device has energy demand, the second mode and the third mode can be determined as the first operating mode, or the first mode and the fourth mode can be determined as the first operating mode, or the first mode and the second mode can be determined as the first operating mode, or the first mode, the second mode and the third mode can be determined as the first operating mode, or the first mode, the second mode and the third mode can be determined as the first operating mode, and so on.

[0096] In another implementation of the present embodiment, the heat exchange modes turned on by all indoor units with the heat exchange mode turned on are the same, and all are heating modes turned on, and the energy storage device has energy demand, then the above-mentioned sixth mode can be determined as the first operating mode, or the above-mentioned fifth mode and sixth mode can be determined as the first operating mode, or the above-mentioned first mode and sixth mode can be determined as the first operating mode, or the above-mentioned first mode, fifth mode and sixth mode can be determined as the first operating mode.

[0097] In another implementation of this embodiment, the heat exchange mode includes a cooling mode or a heating mode, the heat exchange modes turned on by all indoor units that turn on the heat exchange mode are different, and the energy storage device has energy requirements. The first operating mode can be determined according to the priority of turning on the heat exchange mode and / or the priority corresponding to different heat exchange modes and / or the indoor temperature corresponding to the heat exchange mode.

[0098] In this embodiment, the target energy storage state is a heat storage state. In other embodiments, the target energy storage state may also be a cold storage state.

[0099] Step S22, when at least one of the indoor units turns on the heat exchange mode and the energy storage device has no energy demand, determining the second operation mode as the target operation mode, so that the turned-on indoor unit is in the target heat exchange state corresponding to the heat exchange mode and the energy storage device is in a stopped energy storage state;

[0100] The second operation mode here may be the fourth mode or the fifth mode mentioned above. In the second operation mode, the compressor is in the on state, the first control valve is closed, the second control valve in the indoor unit whose heat exchange mode is on and whose corresponding heat exchange demand matches the target heat exchange state of the indoor unit corresponding to the second operation mode is opened, the second control valve in the indoor unit whose heat exchange mode is on or the second control valve in the indoor unit whose heat exchange mode is on and whose corresponding heat exchange demand matches the target heat exchange state of the indoor unit corresponding to the second operation mode is closed or operates at a standby opening, and when the heat exchange mode turned on by at least one indoor unit is the cooling mode, the target heat exchange state is the cooling state, and when the heat exchange mode turned on by at least one indoor unit is the heating mode, the target heat exchange state is the heating state.

[0101] In this embodiment, the target energy storage state is a heat storage state. In other embodiments, the target energy storage state may also be a cold storage state.

[0102] Step S23, when all the indoor units have not turned on the heat exchange mode and the energy storage device has energy demand, determining the third operation mode as the target operation mode to stop the heat exchange of the indoor units and the energy storage device is in the target energy storage state;

[0103] The third operation mode here may be the first mode mentioned above. In the third operation mode, the compressor is in an on state, the first control valve is open, and the second control valves in all indoor units are closed or operate at a standby opening.

[0104] In this embodiment, the target energy storage state is a heat storage state. In other embodiments, the target energy storage state may also be a cold storage state.

[0105] Step S24: when all the indoor units have not started the heat exchange mode and the energy storage device has no energy demand, determining the fourth operation mode as the target operation mode to stop the outdoor unit.

[0106] The fourth operation mode is specifically a stop mode, and the compressor in the outdoor unit is in an off state.

[0107] In this embodiment, through the above method, even if the heat exchange requirements of different indoor spaces and the energy demand state of the energy storage device are different, the operation of the outdoor unit can accurately and effectively meet the different indoor heat exchange requirements and energy requirements, thereby effectively improving the flexibility of the outdoor unit operation to meet different usage requirements.

[0108] Furthermore, in this embodiment, during the execution of step S30, when the target operating mode includes more than one mode, the outdoor unit can be controlled to operate each mode in sequence according to a preset order, or the actual operating parameters of the heat pump system such as the indoor temperature corresponding to the indoor unit in the heat exchange mode and / or the energy storage temperature of the energy storage device can be monitored, and the more than one mode included in the target operating mode can be operated in sequence according to the monitored parameters.

[0109] For example, when the first operating mode includes the second mode and the third mode, the outdoor unit can be controlled to operate in the second mode first, and then in the third mode; or the outdoor unit can be controlled to operate in the third mode first, and then in the second mode; or, the relationship between the indoor heat exchange demand and the energy demand corresponding to the energy demand device is monitored, and when the indoor heat exchange demand is greater than the energy demand corresponding to the energy demand device, the outdoor unit can be controlled to operate in the second mode; when the indoor heat exchange demand is less than the energy demand corresponding to the energy demand device, the outdoor unit can be controlled to operate in the third mode.

[0110] For another example, when the first operating mode includes the first mode and the fourth mode, the outdoor unit may be controlled to operate in the first mode first, and then in the fourth mode; or the outdoor unit may be controlled to operate in the fourth mode first, and then in the first mode; or, the actual operating parameters of the heat pump system such as the indoor temperature corresponding to the indoor unit in the heat exchange mode and / or the energy storage temperature of the energy storage device may be monitored, and the first mode and the fourth mode may be operated in sequence according to the indoor temperature and the energy storage temperature.

[0111] For another example, when the first operating mode includes the fifth mode and the sixth mode, the outdoor unit may be controlled to operate in the fifth mode first, and then in the sixth mode; or the outdoor unit may be controlled to operate in the sixth mode first, and then in the fifth mode; or, the actual operating parameters of the heat pump system such as the indoor temperature corresponding to the indoor unit in the heat exchange mode and / or the energy storage temperature of the energy storage device may be monitored, and the fifth mode and the sixth mode may be operated in sequence according to the indoor temperature and the energy storage temperature.

[0112] For another example, when the first operating mode includes the first mode and the sixth mode, the outdoor unit can be controlled to operate in the first mode first, and then the outdoor unit can be controlled to operate in the sixth mode; or the outdoor unit can be controlled to operate in the sixth mode first, and then the outdoor unit can be controlled to operate in the first mode; or, the actual operating parameters of the heat pump system such as the indoor temperature corresponding to the indoor unit in the heat exchange mode and / or the energy storage temperature of the energy storage device can be monitored, and the first mode and the sixth mode can be operated in sequence according to the indoor temperature and the energy storage temperature.

[0113] Further, in this embodiment, the heat exchange mode includes a cooling mode or a heating mode. When the cooling mode is turned on, it indicates that the corresponding indoor space has a cooling demand, and when the heating mode is turned on, it indicates that the corresponding indoor space has a heating demand. Based on this, when at least one of the indoor units turns on the heat exchange mode and the energy storage device has an energy demand, the step of determining the first operating mode as the target operating mode includes:

[0114] When at least one of the indoor units starts the cooling mode, at least one of the indoor units starts the heating mode, and the energy storage device has energy demand, the first operating mode is determined according to the priorities corresponding to the cooling mode and the heating mode, and the first operating mode is the target operating mode.

[0115] In this embodiment, the priorities corresponding to the cooling mode and the heating mode may be pre-set fixed parameters. For example, when the priority is fixedly set to cooling mode priority, the operating mode for putting the indoor unit in a cooling state and the energy storage device in an energy storage state is determined to be the first operating mode, for example, the second mode and / or the third mode mentioned above is determined to be the first operating mode; for another example, when the priority is fixedly set to heating mode priority, the operating mode for putting the indoor unit in a heating state and the energy storage device in an energy storage state is determined to be the first operating mode, for example, the sixth mode mentioned above is determined to be the first operating mode.

[0116] In other embodiments, the priorities corresponding to the cooling mode and the heating mode can also be determined according to the actual operating conditions of the heat pump system. For example, when the number of indoor units in the cooling mode is greater than the number of indoor units in the heating mode or the required cooling capacity corresponding to the indoor units in the cooling mode is greater than the corresponding heating capacity of the indoor units in the heating mode, the corresponding priority is cooling priority, and the operation mode for satisfying the requirement of placing the indoor units in the cooling state and the energy storage device in the energy storage state is determined to be the first operation mode, for example, the second mode and / or the third mode mentioned above is determined to be the first operation mode; for another example, when the number of indoor units in the cooling mode is less than the number of indoor units in the heating mode or the required cooling capacity corresponding to the indoor units in the cooling mode is less than the corresponding heating capacity of the indoor units in the heating mode, the corresponding priority is heating priority, and the operation mode for placing the indoor units in the cooling state and the energy storage device in the energy storage state is determined to be the first operation mode, for example, the sixth mode mentioned above is determined to be the first operation mode. For another example, the priorities corresponding to the cooling mode and the heating mode can be determined according to the outdoor ambient temperature. When the outdoor ambient temperature is less than the preset temperature, the priority is heating priority; when the outdoor ambient temperature is greater than the preset temperature, the priority is cooling priority.

[0117] In this embodiment, through the above-mentioned method, it can be ensured that when the heat exchange demands of different indoor spaces conflict, the target operation mode of the outdoor unit can be selected based on the priority, thereby ensuring that the heat pump system can operate normally even when the demands conflict, so as to maximize the indoor heat exchange demands according to the priority while meeting the indoor energy demand for the energy storage device.

[0118] Further, in this embodiment, the heat exchange mode includes a cooling mode or a heating mode. When the cooling mode is turned on, it indicates that the corresponding indoor space has a cooling demand, and when the heating mode is turned on, it indicates that the corresponding indoor space has a heating demand. When at least one of the indoor units turns on the heat exchange mode and the energy storage device has no energy demand, the step of determining the second operating mode as the target operating mode includes:

[0119] When at least one of the indoor units starts the cooling mode, at least one of the indoor units starts the heating mode, and the energy storage device has no energy demand, the second operating mode is determined according to the priorities corresponding to the cooling mode and the heating mode, and the second operating mode is the target operating mode.

[0120] In this embodiment, the priorities corresponding to the cooling mode and the heating mode may be pre-set fixed parameters. For example, when the priority is fixedly set to cooling mode priority, the operating mode for putting the indoor unit in a cooling state and the energy storage device in an energy storage state is determined to be the first operating mode, for example, the second mode and / or the third mode mentioned above is determined to be the first operating mode; for another example, when the priority is fixedly set to heating mode priority, the operating mode for putting the indoor unit in a heating state and the energy storage device in an energy storage state is determined to be the first operating mode, for example, the sixth mode mentioned above is determined to be the first operating mode.

[0121] In other embodiments, the priorities corresponding to the cooling mode and the heating mode can also be determined according to the actual operating conditions of the heat pump system. For example, when the number of indoor units in the cooling mode is greater than the number of indoor units in the heating mode or the required cooling capacity corresponding to the indoor units in the cooling mode is greater than the corresponding heating capacity of the indoor units in the heating mode, the corresponding priority is cooling priority, and the operation mode in which the indoor units are in the cooling state and the energy storage device is in the energy storage state is determined to be the first operation mode, for example, the fourth mode mentioned above is determined to be the first operation mode; for another example, when the number of indoor units in the cooling mode is less than the number of indoor units in the heating mode or the required cooling capacity corresponding to the indoor units in the cooling mode is less than the corresponding heating capacity of the indoor units in the heating mode, the corresponding priority is heating priority, and the operation mode in which the indoor units are in the heating state and the energy storage device is in the energy storage state is determined to be the first operation mode, for example, the fifth mode mentioned above is determined to be the first operation mode. For another example, the priorities corresponding to the cooling mode and the heating mode can be determined according to the outdoor ambient temperature. When the outdoor ambient temperature is less than the preset temperature, the priority is heating priority; when the outdoor ambient temperature is greater than the preset temperature, the priority is cooling priority.

[0122] In this embodiment, through the above method, it can be ensured that when the heat exchange demands of different indoor spaces conflict, the target operation mode of the outdoor unit can be selected based on the priority, thereby ensuring that the heat pump system can operate normally even when the demands conflict, so as to maximize the indoor heat exchange demands according to the priority.

[0123] In order to more intuitively understand the scheme of the control method of the heat pump system mentioned in this embodiment, taking two indoor units connected to one outdoor unit as an example, the heat exchange mode of the indoor units is different, the energy demand state of the energy demand device and the operating mode of the outdoor unit can be shown in the following table:

[0124]

[0125] 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. Fig.10 During or after the execution of step S30, the following further includes:

[0126] Step S40, when the target operation mode is the first operation mode, and the indoor unit in the cooling mode reaches the temperature and stops, controlling the outdoor unit to operate in the third operation mode;

[0127] In one implementation of the present embodiment, the indoor heat exchange demand includes an indoor cooling demand, the first operating mode is the above-mentioned second mode and / or third mode, the third operating mode is the above-mentioned first mode, and during the operation of the outdoor unit in the second mode or the third mode, the indoor temperature corresponding to the indoor unit in cooling mode is monitored to determine whether the indoor temperature is less than or equal to the set temperature of the corresponding indoor unit. If it is detected that the indoor temperature corresponding to all indoor units in cooling mode is less than or equal to the corresponding set temperature, it is determined that the corresponding indoor unit has reached the temperature and has stopped, and the outdoor unit can be controlled to operate in the first mode. If it is detected that the indoor temperature corresponding to the indoor unit in cooling mode is greater than the corresponding set temperature, it is determined that the corresponding indoor unit has not reached the temperature and has stopped, and the outdoor unit can be controlled to maintain the current mode of operation.

[0128] In another implementation of the present embodiment, the target heat exchange state includes a heating state, the first operating mode is the sixth mode mentioned above, and the third operating mode is the first mode mentioned above. During the operation of the sixth mode of the outdoor unit, the indoor temperature corresponding to the indoor unit in the heating mode is monitored to determine whether the indoor temperature is greater than or equal to the set temperature of the corresponding indoor unit. If it is detected that the indoor temperature corresponding to all indoor units in the heating mode is greater than or equal to the corresponding set temperature, it is determined that the corresponding indoor unit has reached the temperature and has stopped. At this time, the outdoor unit can be controlled to operate in the first mode. If it is detected that the indoor temperature corresponding to the indoor unit in the heating mode is greater than the corresponding set temperature, it is determined that the corresponding indoor unit has not reached the temperature and has stopped. At this time, the outdoor unit can be controlled to maintain the current mode of operation.

[0129] Step S50: When the target operation mode is the first operation mode and the energy storage temperature of the energy storage device reaches the set energy storage temperature, the outdoor unit is controlled to operate in the second operation mode.

[0130] The energy storage temperature can be specifically detected by the above-mentioned temperature detection module.

[0131] In one implementation of this embodiment, the indoor heat exchange demand includes an indoor cooling demand, the first operating mode is the second mode and / or the third mode, and the second operating mode is the fourth mode. During the operation of the outdoor unit in the second mode or the third mode, the energy storage temperature of the energy storage device is monitored to be greater than or equal to the set energy storage temperature. If the energy storage temperature is greater than or equal to the corresponding set energy storage temperature, the outdoor unit can be controlled to operate in the first mode; if the energy storage temperature is less than the corresponding set energy storage temperature, the outdoor unit can be controlled to maintain the current mode of operation.

[0132] In another implementation of this embodiment, the target heat exchange state includes a heating state, the first operating mode is the sixth mode mentioned above, and the second operating mode is the fifth mode mentioned above. During the operation of the outdoor unit in the sixth mode, the energy storage temperature of the energy storage device is monitored to be greater than or equal to the set energy storage temperature. If the energy storage temperature is greater than or equal to the corresponding set energy storage temperature, the outdoor unit can be controlled to operate in the fifth mode; if the energy storage temperature is less than the corresponding set energy storage temperature, the outdoor unit can be controlled to maintain the current mode of operation.

[0133] In this embodiment, when the outdoor unit needs to meet the indoor heat exchange demand and the energy demand of the energy storage device, the indoor unit promptly switches to the separate energy storage mode when the heat exchange demand is met, and promptly switches to the separate heat exchange mode when the energy demand is met, thereby ensuring the precise satisfaction of indoor comfort and energy storage demand and improving the energy efficiency of the heat pump system.

[0134] In other embodiments, when the indoor heat exchange demand includes a cooling demand, when the target operating mode is the second mode or the third mode mentioned above, and the indoor unit in the cooling mode reaches the temperature and shuts down, and there is an indoor unit in the heating mode, the outdoor unit can be controlled to operate in the sixth mode.

[0135] In other embodiments, when the indoor heat exchange demand includes a heating demand, when the target operating mode is the sixth mode, and the indoor unit in the heating mode reaches the temperature and shuts down, and there is an indoor unit in the cooling mode, the outdoor unit can be controlled to operate in the second mode or the third mode.

[0136] 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 target heat exchange state includes a heating state, the target energy storage state includes a heat storage state, the first operation mode includes a first sub-mode and a second sub-mode, and the target energy storage state includes a heat storage state, ... Fig.11 , the step S30 comprises:

[0137] Step S31, when the target operation mode is the first operation mode, continuously monitoring the energy storage temperature of the energy storage device;

[0138] The temperature data detected by the temperature detection module is obtained in real time or at set intervals, and the energy storage temperature is determined according to the detected temperature data.

[0139] Step S32, when the energy storage temperature is lower than a first preset temperature, controlling the outdoor unit to operate in a first sub-mode so that the energy storage device is in a heat storage state and the indoor unit stops indoor heat exchange;

[0140] In this embodiment, the first sub-mode is the above-mentioned first mode.

[0141] Step S33, when the energy storage temperature is greater than the second preset temperature, controlling the outdoor unit to operate in a second sub-mode, so that the energy storage device is in a heat storage state and the indoor unit is in a heating state;

[0142] In this embodiment, the second sub-mode is the sixth mode mentioned above.

[0143] Step S34: 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, the outdoor unit is controlled to maintain the current state of operation.

[0144] The first preset temperature and the second preset temperature can specifically be temperatures set according to the reliable operation requirements and / or energy efficiency requirements of the heat pump system, and can also be temperatures determined according to a set energy storage temperature. The first preset temperature and the second preset temperature here can also be determined based on the set energy storage temperature, outdoor ambient temperature, outdoor heat exchanger temperature and the exhaust temperature of the compressor to meet heat exchange requirements and energy requirements while improving the energy efficiency and stability of the system operation.

[0145] Among them, after determining the first operation mode, the outdoor unit can be controlled to first operate in the second sub-mode, and the energy storage temperature of the energy storage device can be continuously monitored during the operation of the second sub-mode. When it is detected that the energy storage temperature is less than the first preset temperature, the outdoor unit is controlled to switch to the first sub-mode, otherwise it is maintained in the second sub-mode. When the outdoor unit is operating in the first sub-mode, the energy storage temperature is continuously monitored. When the energy storage temperature is greater than the second preset temperature, the outdoor unit is controlled to switch to the second sub-mode, otherwise it is maintained in the first sub-mode; when the outdoor unit is maintained in the second sub-mode, the energy storage temperature is continuously monitored. When the energy storage temperature is less than the first preset temperature, the outdoor unit is controlled to switch to the first sub-mode, otherwise it is maintained in the second sub-mode.

[0146] In this embodiment, the operation of the outdoor unit is controlled based on the continuously monitored energy storage temperature, so as to ensure that when the system needs to provide heat for the energy storage device and indoor heating at the same time, the energy storage temperature of the energy storage device is high enough to run the second sub-mode to simultaneously meet the heat demand and the indoor heating demand, which is beneficial to improving the energy efficiency of the system, so as to meet the heat demand of the energy storage device and improve the indoor heating efficiency.

[0147] Furthermore, in this embodiment, during or after the execution of step S30, when the indoor heat exchange demand includes the indoor heating demand, when the energy storage temperature of the energy storage device does not reach the set energy storage temperature and the indoor unit in the heating mode does not reach the temperature and shut down, the outdoor unit can be controlled to operate according to steps S31 to S34 here.

[0148] Furthermore, in this embodiment, the control method of the heat pump system also includes: when the target operating mode is the first operating mode, controlling the indoor unit that turns on the heat exchange mode to output a prompt message while the outdoor unit is operating in the first sub-mode, to prompt that there is a conflict between the operation of the indoor unit and the operation of the outdoor unit.

[0149] The prompt information can be output in the form of text and / or light and / or sound.

[0150] In this embodiment, the output of prompt information is helpful to ensure that the user can know the current operating status of the heat pump system function, avoid the user mistakenly believing that the system has failed, and determine whether to adjust the operation of the heat pump system based on actual needs, thereby effectively improving the matching degree between the heat pump system and user needs.

[0151] Further, based on any of the above embodiments, another optional embodiment of the control method of the heat pump system of the present application is proposed. Fig.12 In this embodiment, the control method of the heat pump system further includes:

[0152] Step S100, when the outdoor unit needs to switch to the second target mode during operation in the first target mode, the compressor of the outdoor unit is controlled to remain turned on or turned off according to the indoor unit state and / or the state of the energy storage device corresponding to the first target mode and the second target mode respectively;

[0153] When the heat pump system needs to switch to the target operation mode during operation in other modes, or when the heat pump system needs to switch to other modes during operation in the target operation mode, the indoor heat exchange demand before and after the switching can be followed.

[0154] The indoor unit state includes whether the indoor unit stops heat exchange and the target heat exchange state (cooling state or heating state) when the indoor unit does not stop heat exchange.

[0155] The state of the energy storage device includes whether the energy storage device stops storing energy and the target energy storage state (heat storage state or cold storage state) when the energy storage device does not stop storing energy.

[0156] The first target mode and the second target mode respectively correspond to different states of the indoor unit and / or the energy storage device, and thus the on / off states of the compressor of the outdoor unit are different.

[0157] In this embodiment, when the target heat exchange states of the indoor units corresponding to the first target mode and the second target mode are opposite (cooling state and heating state, respectively), the compressor of the outdoor unit is controlled to stop; when the target heat exchange states of the indoor units corresponding to the first target mode and the second target mode are the same, the compressor of the outdoor unit is controlled to remain turned on.

[0158] Furthermore, in the present embodiment, one end of the refrigerant branch is connected to the exhaust port of the compressor, and when the energy storage device corresponding to one of the first target mode and the second target mode is in a heat storage state and the indoor unit stops heat exchange, and the other corresponding indoor unit of the first target mode and the second target mode is in a cooling state, the compressor of the outdoor unit is controlled to stop; when the energy storage device corresponding to one of the first target mode and the second target mode is in a heat storage state and the indoor unit stops heat exchange, and the other corresponding indoor unit of the first target mode and the second target mode is in a heat storage state, the compressor of the outdoor unit is controlled to remain turned on.

[0159] In order to more intuitively understand the solution of this embodiment, whether the compressor is shut down when the outdoor unit switches between different modes can be seen in the following table:

[0160]

[0161] In this embodiment, when mode A is the first target mode and mode B is the second target mode, or when mode B is the first target mode and mode A is the second target mode, it can be determined whether the compressor of the outdoor unit is maintained on or stopped according to the corresponding relationship shown in the above table.

[0162] For example, when the outdoor unit switches from the fourth mode to the second mode or the third mode, the compressor of the outdoor unit does not stop; for another example, when the outdoor unit switches from the first mode to the second mode or the third mode, the compressor of the outdoor unit stops; for another example, when the outdoor unit switches from the first mode to the fifth mode, the compressor of the outdoor unit does not stop, and so on.

[0163] Step S200, controlling the outdoor unit to switch to the second target mode;

[0164] Among them, one of the first target mode and the second target mode is the target operation mode.

[0165] In this embodiment, when the outdoor unit needs to switch the operating mode, the indoor unit state and / or the state of the energy storage device before and after the mode switching are combined to control whether the outdoor unit switches the mode when the compressor is turned on or turned off. This is beneficial to reducing the number of times the outdoor unit switches the operating mode when it is turned off, reducing system fluctuations caused by mode switching, and thus effectively improving the stability of system operation.

[0166] 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.

[0167] 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.

[0168] 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.

[0169] 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.

[0170] 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 more than one indoor unit and outdoor unit, the refrigerant branch circuit comprises an energy storage device, and the control method of the heat pump system comprises the following steps: Acquire the operating state of each indoor unit and the energy demand state corresponding to the energy storage device, wherein the operating state includes whether the corresponding indoor unit is in a heat exchange mode, and the energy demand state includes whether the energy storage device has energy demand; determining a target operation mode of the outdoor unit according to more than one of the operation states and the energy demand state; The outdoor unit is controlled to operate according to the target operation mode.

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 outdoor unit according to more than one of the operation states and the energy demand state comprises: When at least one of the indoor units turns on the heat exchange mode and the energy storage device has energy demand, determining the first operation mode as the target operation mode so that the turned-on indoor unit is in a target heat exchange state corresponding to the heat exchange mode and the energy storage device is in a target energy storage state corresponding to the energy demand; When at least one of the indoor units turns on the heat exchange mode and the energy storage device has no energy demand, determining the second operation mode as the target operation mode, so that the turned-on indoor unit is in a target heat exchange state corresponding to the heat exchange mode and the energy storage device is in a stopped energy storage state; When all the indoor units have not started the heat exchange mode and the energy storage device has energy demand, determining the third operation mode as the target operation mode to stop the heat exchange of the indoor units and the energy storage device is in the target energy storage state; When all the indoor units have not started the heat exchange mode and the energy storage device has no energy demand, the fourth operation mode is determined as the target operation mode to stop the outdoor unit.

3. The control method of the heat pump system according to claim 2, characterized in that: The heat exchange mode includes a cooling mode or a heating mode, and when at least one of the indoor units turns on the heat exchange mode and the energy storage device has energy demand, the step of determining the first operation mode as the target operation mode includes: When at least one of the indoor units starts the cooling mode, at least one of the indoor units starts the heating mode, and the energy storage device has energy demand, the first operating mode is determined according to the priorities corresponding to the cooling mode and the heating mode, and the first operating mode is the target operating mode.

4. The control method of the heat pump system according to claim 2, characterized in that: The heat exchange mode includes a cooling mode or a heating mode, and when at least one of the indoor units turns on the heat exchange mode and the energy storage device has no energy demand, the step of determining the second operation mode as the target operation mode includes: When at least one of the indoor units starts the cooling mode, at least one of the indoor units starts the heating mode, and the energy storage device has no energy demand, the second operating mode is determined according to the priorities corresponding to the cooling mode and the heating mode, and the second operating mode is the target operating mode.

5. The control method of the heat pump system according to claim 2, characterized in that: During or after the step of controlling the operation of the outdoor unit according to the target operation mode, the step further includes: When the target operation mode is the first operation mode, and the indoor unit in the heat exchange mode reaches the temperature and stops, controlling the outdoor unit to operate in the third operation mode; When the target operation mode is the first operation mode and the energy storage temperature of the energy storage device reaches a set energy storage temperature, the outdoor unit is controlled to operate in the second operation mode.

6. The control method of the heat pump system according to claim 2, characterized in that: The target heat exchange state includes a heating state, the target energy storage state includes a heat storage state, the first operation mode includes a first sub-mode and a second sub-mode, and the step of controlling the operation of the outdoor unit according to the target operation mode includes: When the target operation mode is the first operation mode, continuously monitoring the energy storage temperature of the energy storage device; When the energy storage temperature is lower than a first preset temperature, controlling the outdoor unit to operate in a first sub-mode so that the energy storage device is in a heat storage state and the indoor unit stops indoor heat exchange; When the energy storage temperature is greater than the second preset temperature, controlling the outdoor unit to operate in a second sub-mode so that the energy storage device is in a heat storage state and the indoor unit is in a heating state; When the energy storage temperature is greater than or equal to the first preset temperature, and the energy storage temperature is less than or equal to the second preset temperature, the outdoor unit is controlled to maintain operation in a current state.

7. The control method of the heat pump system according to claim 6, characterized in that: The control method of the heat pump system further includes: When the target operation mode is the first operation mode, the indoor unit in the heat exchange mode is controlled to output prompt information when the outdoor unit is operating in the first sub-mode to prompt that there is a conflict between the operation of the indoor unit and the operation of the outdoor unit.

8. The control method of a heat pump system according to any one of claims 1 to 7, characterized in that: The control method of the heat pump system further includes: When the outdoor unit needs to switch to the second target mode during operation of the first target mode, the compressor of the outdoor unit is controlled to remain turned on or stopped according to the indoor unit state and / or the state of the energy storage device corresponding to the first target mode and the second target mode respectively; Controlling the outdoor unit to switch to the second target mode; Among them, one of the first target mode and the second target mode is the target operation mode.

9. The control method of the heat pump system according to claim 8, characterized in that: The step of controlling the compressor of the outdoor unit to maintain startup or shutdown according to the indoor unit status and / or the status of the energy storage device corresponding to the first target mode and the second target mode respectively comprises: When the target heat exchange states of the indoor units respectively corresponding to the first target mode and the second target mode are opposite, controlling the compressor of the outdoor unit to stop; When the energy storage device corresponding to one of the first target mode and the second target mode is in a heat storage state and the indoor unit stops heat exchange, and the indoor unit corresponding to the other of the first target mode and the second target mode is in a cooling state, controlling the compressor of the outdoor unit to stop; When the target heat exchange states of the indoor units respectively corresponding to the first target mode and the second target mode are the same, controlling the compressor of the outdoor unit to remain turned on; When the energy storage device corresponding to one of the first target mode and the second target mode is in a heat storage state and the indoor unit stops heat exchange, and the other indoor unit corresponding to the first target mode and the second target mode is in a heating state, the compressor of the outdoor unit is controlled to remain turned on.

10. 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 more than one indoor unit and outdoor unit, and the refrigerant branch circuit comprises an energy storage device; The indoor unit and the outdoor unit are both connected to the control device, which includes: a memory, a processor, and a control program of the heat pump system stored in the memory and executable on the processor, wherein the control program of the heat pump system implements the steps of the control method of the heat pump system as described in any one of claims 1 to 9 when executed by the processor.

11. 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 9 are implemented.

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