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 an indoor unit, the refrigerant branch path comprises an energy storage device, and the method comprises the steps that when the heat pump system has the heating requirement of the indoor unit and the heat storage requirement of the energy storage device, the energy storage device is connected with the indoor unit; controlling the heat pump system to operate and / or controlling a heating device of the energy storage device to operate so as to increase the temperature of an energy storage medium of the energy storage device; and when the operation of the heat pump system reaches a preset condition, the heat pump system is controlled to operate in a target operation mode, so that the indoor unit is in a heating state, and the energy storage device is in a heat storage state. The heating effect of the air conditioner is improved when the heat pump system has the indoor heating and heat storage requirements at the same time.

Description

Technical Field

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

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

[0003] Among them, the heat pump system needs to use heat for both indoor heating and heat storage in the energy storage device. When the user has both indoor heating and heat storage needs, if the heat pump system directly turns on the heating and hot water mode, when the temperature of the energy storage device is low, a large amount of heat output by the compressor will be used for heat storage. Uneven heat distribution can easily lead to poor indoor heating effect, affecting the comfort of indoor users. Summary of the invention

[0004] 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 heating effect of an air conditioner when the heat pump system has both indoor heating and heat storage requirements.

[0005] 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, the refrigerant branch circuit comprising an energy storage device, and the control method for the heat pump system comprising the following steps:

[0006] When the heat pump system has a heating demand of the indoor unit and a heat storage demand of the energy storage device, controlling the heat pump system to operate and / or controlling the heating device of the energy storage device to operate to increase the temperature of the energy storage medium of the energy storage device;

[0007] When the operation of the heat pump system reaches a preset condition, the heat pump system is controlled to operate in a target operation mode so that the indoor unit is in a heating state and the energy storage device is in a heat storage state.

[0008] Optionally, the step of controlling the operation of the heat pump system to increase the temperature of the energy storage medium of the energy storage device includes:

[0009] Obtaining the priority order of the heating demand and the heat storage demand;

[0010] When the priority order is that the heating demand takes precedence over the heat storage demand, the heating device is controlled to be turned on and the heat pump system is controlled to operate in a first operation mode so that the indoor unit is in a heating state and the energy storage device is in a stopped energy storage state, or the heating device is controlled to be turned on and the heat pump system is controlled to operate in a second operation mode so that the indoor unit is in a heating state and the refrigerant flowing through the refrigerant branch absorbs heat from the energy storage device, and the heating amount of the heating device in the second operation mode is greater than or equal to the heat absorption amount of the refrigerant in the energy storage device;

[0011] When the priority order is that the heat storage demand takes precedence over the heating demand, the heat pump system is controlled to operate in a third operation mode so that the indoor unit is in a heat exchange stop state and the energy storage device is in a heat storage state.

[0012] Optionally, the step of obtaining the priority order of the heating demand and the heat storage demand includes:

[0013] Obtaining user setting parameters of the heat pump system;

[0014] The priority order is determined according to the user setting parameters.

[0015] Optionally, the refrigerant main circuit further includes a compressor, the refrigerant branch circuit and the indoor unit are both connected to the compressor, and when the priority order is that the heating demand takes precedence over the heat storage demand, the step of controlling the heating device to turn on and controlling the heat pump system to operate in a first operating mode so that the indoor unit is in a heating state and the energy storage device is in a stopped energy storage state, or controlling the heating device to turn on and controlling the heat pump system to operate in a second operating mode so that the indoor unit is in a heating state and the refrigerant flowing through the refrigerant branch circuit absorbs heat from the energy storage device comprises:

[0016] When the priority order is that the heating demand takes precedence over the heat storage demand, and the startup time of the compressor is greater than a preset time, controlling the heating device to start and controlling the heat pump system to operate in the first operation mode;

[0017] When the priority order is that the heating demand takes precedence over the heat storage demand, and the startup duration of the compressor is less than or equal to the preset duration, the heating device is controlled to start and the heat pump system is controlled to operate in the second operation mode.

[0018] Optionally, the refrigerant main circuit further includes a compressor, an outdoor heat exchanger, a throttling device and a reversing component, the exhaust port of the compressor, the return air port of the compressor, the indoor unit, the outdoor heat exchanger, and one end of the refrigerant branch are all connected to the reversing component, the pipeline between the indoor unit and the outdoor heat exchanger is connected to the other end of the refrigerant branch, the indoor unit, the throttling device and the outdoor heat exchanger are connected in sequence, the refrigerant branch includes a first control valve connected in series with the energy storage device, and the indoor unit includes an indoor heat exchanger and a second control valve connected in series with the indoor heat exchanger;

[0019] The step of controlling the heat pump system to operate in the first operation mode so that the indoor unit is in a heating state and the energy storage device is in a stopped energy storage state comprises: controlling the first control valve to be closed, controlling the second control valve to be open, and controlling the reversing assembly to operate in the first state so that the indoor unit is connected to the exhaust port and the outdoor heat exchanger is connected to the return air port;

[0020] And / or, the step of controlling the heat pump system to operate in the second operation mode so that the indoor unit is in a heating state and the refrigerant flowing through the refrigerant branch absorbs heat from the energy storage device includes: controlling the first control valve to open, controlling the second control valve to open, and controlling the reversing component to operate in the second state so that the indoor unit is connected to the exhaust port and one end of the refrigerant branch is connected to the return air port;

[0021] And / or, the step of controlling the heat pump system to operate in a third operating mode so that the indoor unit is in a state of stopping heat exchange and the energy storage device is in a heat storage state includes: controlling the first control valve to open, controlling the second control valve to close, and controlling the reversing assembly to operate in a third state so that one end of the refrigerant branch is connected to the exhaust port and the outdoor heat exchanger is connected to the return air port.

[0022] Optionally, the preset condition includes that the energy storage medium temperature of the energy storage device is greater than a target medium temperature.

[0023] Optionally, the refrigerant branch further includes a first control valve connected in series with the energy storage device, the indoor unit includes an indoor heat exchanger and a second control valve connected in series with the indoor heat exchanger, and before the step of controlling the heat pump system to operate in a target operation mode so that the indoor unit is in a heating state and the energy storage device is in a heat storage state when the operation of the heat pump system reaches a preset condition, the step further includes:

[0024] Acquire the ambient temperature of the environment where the heat pump system is located, the temperature difference between the current energy storage medium temperature of the energy storage device and the set medium temperature of the energy storage device, and the opening relationship value between the first control valve and the second control valve;

[0025] The target medium temperature is determined according to the ambient temperature, the temperature difference value and the opening relationship value.

[0026] Optionally, the refrigerant branch further includes a first control valve connected in series with the energy storage device. After the step of controlling the heat pump system to operate in a target operation mode so that the indoor unit is in a heating state and the energy storage device is in a heat storage state when the operation of the heat pump system reaches a preset condition, the step further includes:

[0027] When the temperature of the energy storage medium in the energy storage device is greater than the protection temperature, the first control valve is controlled to close.

[0028] 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 unit, and the refrigerant branch circuit comprising an energy storage device;

[0029] 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.

[0030] 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.

[0031] The present invention proposes a control method for a heat pump system. When the heat pump system has both indoor heating demand and heat storage demand, the heat pump system does not directly enter the indoor heating and heat storage mode, but first increases the temperature of the energy storage medium in the energy storage device, and then operates the indoor heating and heat storage mode when it reaches a certain condition, effectively avoiding the problem of uneven heat distribution when operating the indoor heating and heat storage modes, achieving improved indoor heating effect, thereby achieving improved heating effect of the air conditioner when the heat pump system has both indoor heating and heat storage demands. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] 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;

[0033] 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;

[0034] Figure 3A 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;

[0035] 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;

[0036] 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;

[0037] 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;

[0038] 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;

[0039] Figure 8 A schematic flow chart of an embodiment of a control method for a heat pump system of the present invention;

[0040] Fig. 9 A schematic flow chart of another embodiment of a control method for a heat pump system of the present invention;

[0041] Fig.10 This is a flow chart of another embodiment of the control method of the heat pump system of the present invention.

[0042] 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

[0043] 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.

[0044] An embodiment of the present invention provides a heat pump system.

[0045] 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 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 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 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] In some embodiments, the reversing assembly 5 may further include a switching valve (not shown), and the reversing assembly 5 (switching valve (not shown)) 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 (not shown) may be a three-way valve or a four-way valve, and the switching valve (not shown) includes a first switching state and a second switching state; when the switching valve (not shown) 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 (not shown) is in the second switching state, the exhaust port of the compressor 1 is connected to the energy storage device 7.

[0055] 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:

[0056] 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 be heat stored separately. Among them, if there is a switching valve (not shown), the switching valve (not shown) is in the second switching state.

[0057] 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 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 (not shown), the switching valve (not shown) is in the second switching state.

[0058] 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. Among them, if there is a switching valve (not shown), the switching valve (not shown) is in the second switching state.

[0059] 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. Among them, if there is a switching valve (not shown), the switching valve (not shown) is in the second switching state.

[0060] 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. Among them, if there is a switching valve (not shown), the switching valve (not shown) is in the second switching state.

[0061] 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. If there is a switching valve (not shown), the switching valve (not shown) is in the second switching state.

[0062] 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.

[0063] Further, see Figure 7 The heat pump system further includes an environment sensor 01 , which can be arranged in the environment where the air conditioner is located to detect the environment temperature. The environment sensor 01 is connected to the control device 100 .

[0064] 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 medium of the energy storage device 7.

[0065] Further, see Figure 7 The heat pump system further comprises a heating device 03, which is connected to the control device 100. The heating device 03 is arranged at the energy storage device 7 to heat the energy storage device 7.

[0066] 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.

[0067] 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.

[0068] like Figure 7 As shown, the memory 1002 as a computer storage medium may include a control program for the heat pump system.

[0069] 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.

[0070] 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.

[0071] 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:

[0072] Step S10, when the heat pump system has a heating demand of the indoor unit and a heat storage demand of the energy storage device, controlling the heat pump system to operate and / or controlling the heating device of the energy storage device to operate to increase the temperature of the energy storage medium of the energy storage device;

[0073] In this embodiment, when the heat pump system receives the start-up instruction of the target operation mode, it can be considered that the heat pump system has heating demand and heat storage demand. In other embodiments, the heat pump system can also be considered to have heating demand and heat storage demand when it is monitored that the temperature of the energy storage medium of the energy storage device and the environmental state of the indoor environment where the indoor unit is located meet the set conditions.

[0074] In one implementation, the temperature of the energy storage medium can be increased by first running the heat pump system in a set mode to put the energy storage device in a heat storage state. In another implementation, the temperature of the energy storage medium can also be increased by heating the energy storage device through a heating device in the heat pump system.

[0075] During the process of increasing the temperature of the energy storage medium, the compressor can be in the closed state or in the open state.

[0076] Step S20, when the operation of the heat pump system reaches a preset condition, controlling the heat pump system to operate in a target operation mode so that the indoor unit is in a heating state and the energy storage device is in a heat storage state.

[0077] The preset conditions are the conditions that the heat pump system operating state parameters (such as operating time and / or energy storage medium temperature and / or compressor exhaust temperature and / or compressor return air temperature, etc.) need to meet when the temperature of the energy storage medium in the energy storage device reaches the target temperature. The target temperature here is the target value that the energy storage medium temperature needs to reach when the indoor heating effect can reach a better state when the heat pump system is heating and storing heat at the same time.

[0078] In this embodiment, the preset condition includes that the energy storage medium temperature of the energy storage device is greater than the target medium temperature.

[0079] The target operation mode here is the sixth mode mentioned above, the first reversing valve operates at the second valve position, the second reversing valve operates at the fourth valve position, the first control valve is opened, and the second control valve is opened. A part of the refrigerant discharged by the compressor flows through the indoor heat exchanger, the second control valve, the throttling device and the outdoor heat exchanger in turn and then flows back to the compressor; another part of the refrigerant discharged by the compressor flows into the refrigerant branch, and the heat is stored in the energy storage device when the refrigerant flows through the energy storage device. The refrigerant flowing out of the refrigerant branch merges with the refrigerant flowing out of the indoor unit and flows through the throttling device and the outdoor heat exchanger in turn and then flows back to the compressor. In the sixth mode, the indoor heat exchanger is in a condensing state and the outdoor heat exchanger 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. In the sixth mode, the indoor environment can be heated while the energy storage device stores heat.

[0080] A control method for a heat pump system is proposed in an embodiment of the present invention. According to the method, when the heat pump system has both indoor heating demand and heat storage demand, the heat pump system does not directly enter the indoor heating and heat storage mode, but first increases the temperature of the energy storage medium in the energy storage device, and then operates the indoor heating and heat storage mode when it reaches a certain condition, thereby effectively avoiding the problem of uneven heat distribution when operating the indoor heating and heat storage modes, achieving an improvement in the indoor heating effect, and thus achieving an improved heating effect of the air conditioner when the heat pump system has both indoor heating and heat storage demands.

[0081] 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 of controlling the operation of the heat pump system and / or controlling the operation of the heating device of the energy storage device to increase the temperature of the energy storage medium of the energy storage device includes:

[0082] Step S11, obtaining the priority order of the heating demand and the heat storage demand;

[0083] The priority order here can be a pre-set fixed order, or it can be an order determined by the heat pump system based on the detected state parameters. For example, the indoor temperature of the environment where the indoor unit with heating demand is located and the energy storage medium temperature of the energy storage device can be detected, and the priority order here can be determined based on the temperature difference between the indoor temperature and the set temperature and the temperature difference between the energy storage medium temperature and the set medium temperature.

[0084] Step S12, when the priority order is that the heating demand takes precedence over the heat storage demand, controlling the heating device to turn on and controlling the heat pump system to operate in a first operation mode so that the indoor unit is in a heating state and the energy storage device is in a stopped energy storage state, or controlling the heating device to turn on and controlling the heat pump system to operate in a second operation mode so that the indoor unit is in a heating state and the refrigerant flowing through the refrigerant branch absorbs heat from the energy storage device, and in the second operation mode, the heating amount of the heating device is greater than or equal to the heat absorption amount of the refrigerant in the energy storage device;

[0085] When the heating device is turned on, it can be operated at a fixed power, or it can be operated at a power determined according to the actual operation of the heat pump system. In this embodiment, the heating device is turned on at maximum power.

[0086] In this embodiment, based on the structure of the above-mentioned heat pump system, the step of controlling the heat pump system to operate in the first operating mode so that the indoor unit is in a heating state and the energy storage device is in a stopped energy storage state includes: controlling the first control valve to close, controlling the second control valve to open, and controlling the reversing assembly to operate in the first state so that the indoor unit is connected to the exhaust port and the outdoor heat exchanger is connected to the return air port.

[0087] Here, the first operation mode may be the fifth mode mentioned above. In the fifth mode, the first reversing valve operates at the second valve position, the second reversing valve operates at the fourth valve position, the first control valve is closed, and the second control valve is opened. The refrigerant discharged from the compressor flows through the indoor heat exchanger, the second control valve, the throttling device, and the outdoor heat exchanger in sequence and then flows back to the compressor. In the fifth mode, the indoor heat exchanger is in a condensing state, the outdoor heat exchanger is in an evaporating state, and the indoor fan in the indoor unit with heating demand is turned on. In the fifth mode, the indoor environment can be heated while the energy storage device stops storing heat.

[0088] In this embodiment, based on the structure of the heat pump system, the step of controlling the heat pump system to operate in the second operation mode so that the indoor unit is in a heating state and the refrigerant flowing through the refrigerant branch absorbs heat from the energy storage device includes: controlling the first control valve to open, controlling the second control valve to open, and controlling the reversing component to operate in the second state so that the indoor unit is connected to the exhaust port and one end of the refrigerant branch is connected to the return air port;

[0089] In the second operating mode, the switching valve is in the first switching state, the first reversing valve operates in the second valve position, the second reversing valve operates in the fourth valve position, the first control valve is opened, and the second control valve is opened. The refrigerant discharged from the compressor flows through the indoor heat exchanger, the second control valve, the throttling device, and the outdoor heat exchanger in sequence and then flows back to the compressor. Another part of the refrigerant flowing out of the indoor heat exchanger can flow into the energy storage device to absorb its heat. In the second operating mode, the indoor heat exchanger is in a condensing state, the outdoor heat exchanger is in an evaporating state, and the indoor fan in the indoor unit with heating demand is turned on. In the second operating mode, the energy storage device is in a heat release state, and the stored heat can be released to the refrigerant flowing through. In other embodiments, the second reversing valve can also operate in the third valve position in the second operating mode.

[0090] It should be noted that in the second operating mode, even if the refrigerant absorbs part of the heat from the energy storage device, the temperature of the energy storage medium of the energy storage device tends to rise under the action of the heating device. Specifically, the outdoor ambient temperature and the energy storage medium temperature can be obtained first when the compressor is started, and the operating power of the heating device here is determined according to the outdoor ambient temperature and the energy storage medium temperature to ensure that the heating device can provide sufficient heat for the increase of the energy storage medium temperature and the preheating of the compressor.

[0091] Step S13: when the priority order is that the heat storage demand takes precedence over the heating demand, controlling the heat pump system to operate in a third operation mode so that the indoor unit is in a heat exchange stop state and the energy storage device is in a heat storage state.

[0092] In this embodiment, based on the structure of the above-mentioned heat pump system, the step of controlling the heat pump system to operate in the third operating mode so that the indoor unit is in a state of stopping heat exchange and the energy storage device is in a heat storage state includes: controlling the first control valve to open, controlling the second control valve to close, and controlling the reversing assembly to operate in the third state so that one end of the refrigerant branch is connected to the exhaust port and the outdoor heat exchanger is connected to the return air port.

[0093] The third operating mode may be the first mode mentioned above. In the first mode, the switching valve is in the second switching state, the first reversing valve operates at the first valve position, the second reversing valve operates at the fourth valve position, the second control valve is closed, and the first control valve is opened. All the refrigerant discharged from the compressor flows into the refrigerant branch. The heat of the refrigerant flowing into the refrigerant branch is stored in the energy storage device when it flows through the energy storage device. The refrigerant flowing out of the refrigerant branch flows through the throttling device and the outdoor heat exchanger in turn and then flows back to the compressor. In the first mode, the indoor heat exchanger stops heat exchange, the outdoor heat exchanger is in an evaporating state, and all heat is used to store heat in the energy storage device. In the first mode, the energy storage device can store heat separately.

[0094] In this embodiment, a method of increasing the temperature of the energy storage medium in the energy storage device is selected based on the priority of the heat storage demand and the heating demand, so as to achieve the temperature of the energy storage medium while ensuring that the user's heating and heat storage demands are effectively met.

[0095] Furthermore, in this embodiment, the step of obtaining the priority order of the heating demand and the heat storage demand includes: obtaining user setting parameters of the heat pump system; and determining the priority order according to the user setting parameters.

[0096] Based on this, it is helpful to further ensure that the operation of the heat pump system can accurately meet user needs.

[0097] Furthermore, in this embodiment, the refrigerant main circuit further includes a compressor, the refrigerant branch circuit and the indoor unit are both connected to the compressor, and step S12 includes:

[0098] When the priority order is that the heating demand takes precedence over the heat storage demand, and the startup time of the compressor is greater than a preset time, controlling the heating device to start and controlling the heat pump system to operate in the first operation mode;

[0099] When the priority order is that the heating demand takes precedence over the heat storage demand, and the startup duration of the compressor is less than or equal to the preset duration, the heating device is controlled to start and the heat pump system is controlled to operate in the second operation mode.

[0100] The preset duration is specifically the duration required for the compressor to reach stable operation, which may be a preset fixed duration or a duration determined according to the outdoor ambient temperature.

[0101] In this embodiment, when the compressor startup time is long, it indicates that the compressor has reached a stable operating state. At this time, the heating device is turned on and the first operating mode is operated simultaneously, which is conducive to the rapid increase of the temperature of the energy storage medium. When the compressor startup time is short, it indicates that the compressor has not reached a stable operating state. At this time, the heating device is turned on and the second operating mode is operated simultaneously to preheat the compressor and quickly increase the output capacity of the compressor, thereby achieving the increase of the temperature of the energy storage medium and improving the stability of the system operation.

[0102] 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 refrigerant branch further includes a first control valve connected in series with the energy storage device, the indoor unit includes an indoor heat exchanger and a second control valve connected in series with the indoor heat exchanger, the preset condition includes that the energy storage medium temperature of the energy storage device is greater than the target medium temperature, and the reference Fig.10 , before step S20, further comprising:

[0103] Step S01, obtaining the ambient temperature of the environment where the heat pump system is located, the temperature difference between the current energy storage medium temperature of the energy storage device and the set medium temperature of the energy storage device, and the opening relationship value between the first control valve and the second control valve;

[0104] The ambient temperature includes an outdoor ambient temperature and / or an indoor ambient temperature of an indoor environment where an indoor unit having energy demand is located.

[0105] The opening relationship value may include a ratio or a difference of openings, etc.

[0106] Step S02: determining the target medium temperature according to the ambient temperature, the temperature difference value and the opening relationship value.

[0107] The corresponding relationship between the ambient temperature, the temperature difference value, the opening relationship value and the target medium temperature is preset, and the corresponding relationship may include a calculation formula, a mapping relationship, etc. Based on the corresponding relationship, the target medium temperature corresponding to the current ambient temperature, the temperature difference value and the opening relationship value can be determined. For example, the target medium temperature can be calculated by substituting the current ambient temperature, the temperature difference value and the opening relationship value into a preset formula.

[0108] In addition, the target correspondence between the ambient temperature, the temperature difference and the target medium temperature can be determined according to the opening relationship value. Based on the target correspondence, the target medium temperature corresponding to the current indoor ambient temperature, outdoor ambient temperature and the temperature difference can be determined.

[0109] In this embodiment, the ambient temperature can accurately characterize the heating capacity and heating demand of the system, the temperature difference value can accurately reflect the energy storage demand of the energy storage device, and the opening relationship value can accurately reflect the current system refrigerant distribution situation. Based on this, the target medium temperature for triggering the target operation mode is determined in combination with the ambient temperature, the temperature difference value and the opening relationship value, which is conducive to ensuring that the target operation mode is entered in a timely manner based on the target medium temperature while ensuring the indoor heating effect, thereby ensuring that the heat pump system can quickly meet the user's indoor heating demand and heat storage demand at the same time.

[0110] Further, based on any of the above embodiments, in this embodiment, the refrigerant branch also includes a first control valve connected in series with the energy storage device, and after step S20, it also includes: when the temperature of the energy storage medium in the energy storage device is greater than the protection temperature, controlling the first control valve to close.

[0111] The protection temperature is specifically a preset maximum temperature that the energy storage medium of the energy storage device can reach in order to prevent the energy storage device from being damaged.

[0112] In this embodiment, when the temperature of the energy storage medium is higher than the protection temperature, the first control valve is closed and the energy storage device is stopped from continuing to store heat, which is beneficial to further meet user needs while protecting the equipment.

[0113] 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.

[0114] 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.

[0115] 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.

[0116] 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.

[0117] 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, the refrigerant branch circuit comprises an energy storage device, and the control method of the heat pump system comprises the following steps: When the heat pump system has a heating demand of the indoor unit and a heat storage demand of the energy storage device, controlling the heat pump system to operate and / or controlling the heating device of the energy storage device to operate to increase the temperature of the energy storage medium of the energy storage device; When the operation of the heat pump system reaches a preset condition, the heat pump system is controlled to operate in a target operation mode so that the indoor unit is in a heating state and the energy storage device is in a heat storage state.

2. The control method of the heat pump system according to claim 1, characterized in that: The step of controlling the operation of the heat pump system and / or controlling the operation of the heating device of the energy storage device to increase the temperature of the energy storage medium of the energy storage device comprises: Obtaining the priority order of the heating demand and the heat storage demand; When the priority order is that the heating demand takes precedence over the heat storage demand, the heating device is controlled to be turned on and the heat pump system is controlled to operate in a first operation mode so that the indoor unit is in a heating state and the energy storage device is in a stopped energy storage state, or the heating device is controlled to be turned on and the heat pump system is controlled to operate in a second operation mode so that the indoor unit is in a heating state and the refrigerant flowing through the refrigerant branch absorbs heat from the energy storage device, and the heating amount of the heating device in the second operation mode is greater than or equal to the heat absorption amount of the refrigerant in the energy storage device; When the priority order is that the heat storage demand takes precedence over the heating demand, the heat pump system is controlled to operate in a third operation mode so that the indoor unit is in a heat exchange stop state and the energy storage device is in a heat storage state.

3. The control method of the heat pump system according to claim 2, characterized in that: The step of obtaining the priority order of the heating demand and the heat storage demand comprises: Obtaining user setting parameters of the heat pump system; The priority order is determined according to the user setting parameters.

4. The control method of the heat pump system according to claim 2, characterized in that: The refrigerant main circuit also includes a compressor, and the refrigerant branch circuit and the indoor unit are both connected to the compressor. When the priority order is that the heating demand takes precedence over the heat storage demand, the steps of controlling the heating device to turn on and controlling the heat pump system to operate in a first operation mode so that the indoor unit is in a heating state and the energy storage device is in a stopped energy storage state, or controlling the heating device to turn on and controlling the heat pump system to operate in a second operation mode so that the indoor unit is in a heating state and the refrigerant flowing through the refrigerant branch circuit absorbs heat from the energy storage device include: When the priority order is that the heating demand takes precedence over the heat storage demand, and the startup time of the compressor is greater than a preset time, controlling the heating device to start and controlling the heat pump system to operate in the first operation mode; When the priority order is that the heating demand takes precedence over the heat storage demand, and the startup duration of the compressor is less than or equal to the preset duration, the heating device is controlled to start and the heat pump system is controlled to operate in the second operation mode.

5. The control method of the heat pump system according to claim 2, characterized in that: The refrigerant main circuit also includes a compressor, an outdoor heat exchanger, a throttling device and a reversing component. The exhaust port of the compressor, the return air port of the compressor, the indoor unit, the outdoor heat exchanger, and one end of the refrigerant branch are all connected to the reversing component. The pipeline between the indoor unit and the outdoor heat exchanger is connected to the other end of the refrigerant branch. The indoor unit, the throttling device and the outdoor heat exchanger are connected in sequence. The refrigerant branch includes a first control valve connected in series with the energy storage device, and the indoor unit includes an indoor heat exchanger and a second control valve connected in series with the indoor heat exchanger. The step of controlling the heat pump system to operate in the first operation mode so that the indoor unit is in a heating state and the energy storage device is in a stopped energy storage state comprises: controlling the first control valve to be closed, controlling the second control valve to be open, and controlling the reversing assembly to operate in the first state so that the indoor unit is connected to the exhaust port and the outdoor heat exchanger is connected to the return air port; And / or, the step of controlling the heat pump system to operate in the second operation mode so that the indoor unit is in a heating state and the refrigerant flowing through the refrigerant branch absorbs heat from the energy storage device includes: controlling the first control valve to open, controlling the second control valve to open, and controlling the reversing component to operate in the second state so that the indoor unit is connected to the exhaust port and one end of the refrigerant branch is connected to the return air port; And / or, the step of controlling the heat pump system to operate in a third operating mode so that the indoor unit is in a state of stopping heat exchange and the energy storage device is in a heat storage state includes: controlling the first control valve to open, controlling the second control valve to close, and controlling the reversing assembly to operate in a third state so that one end of the refrigerant branch is connected to the exhaust port and the outdoor heat exchanger is connected to the return air port.

6. The control method of the heat pump system according to any one of claims 1 to 5, characterized in that: The preset condition includes that the energy storage medium temperature of the energy storage device is greater than the target medium temperature.

7. The control method of the heat pump system according to claim 6, characterized in that: The refrigerant branch further includes a first control valve connected in series with the energy storage device, the indoor unit includes an indoor heat exchanger and a second control valve connected in series with the indoor heat exchanger, and before the step of controlling the heat pump system to operate in a target operation mode so that the indoor unit is in a heating state and the energy storage device is in a heat storage state when the operation of the heat pump system reaches a preset condition, the step further includes: Acquire the ambient temperature of the environment where the heat pump system is located, the temperature difference between the current energy storage medium temperature of the energy storage device and the set medium temperature of the energy storage device, and the opening relationship value between the first control valve and the second control valve; The target medium temperature is determined according to the ambient temperature, the temperature difference value and the opening relationship value.

8. The control method of a heat pump system according to any one of claims 1 to 5, characterized in that: The refrigerant branch further includes a first control valve connected in series with the energy storage device. After the step of controlling the heat pump system to operate in a target operation mode so that the indoor unit is in a heating state and the energy storage device is in a heat storage state when the operation of the heat pump system reaches a preset condition, the step further includes: When the temperature of the energy storage medium in the energy storage device is greater than the protection temperature, the first control valve is controlled to close.

9. 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 unit, and the refrigerant branch circuit comprises an energy storage device; The control device includes: a memory, a processor, and a control program of the heat pump system stored in the memory and executable on the processor. When the control program of the heat pump system is executed by the processor, the steps of the control method of the heat pump system as described in any one of claims 1 to 8 are implemented.

10. 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 8 are implemented.

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