Heat pump system and control method, control device and computer readable storage medium thereof

Abstract

This application relates to a heat pump system and its control method, as well as a computer-readable storage medium. The heat pump system includes an outdoor unit, a first water pump, a second water pump, and a buffer tank. The outdoor unit is connected to the buffer tank via the first water pump. Both the first water pump and the buffer tank are connected to the second water pump, which is used to deliver hot water to a user terminal. The control method includes: when the heat pump system enters defrost mode, acquiring the water temperature in the buffer tank; and controlling the operating status of the first and second water pumps based on the water temperature to deliver hot water from the buffer tank to the user terminal, or to stop delivering hot water to the user terminal. In the control method of this application embodiment, if the water temperature in the buffer tank is above the expected temperature, the hot water in the buffer tank can be delivered to the user terminal. If the water temperature in the buffer tank does not reach the expected temperature, the delivery of hot water to the user is stopped. This helps to avoid delivering relatively low-temperature water to the user terminal, which would affect the user experience.

Description

Technical Field

[0001] This application relates to the field of cooling and hot water equipment technology, and in particular to a heat pump system and its control method, control device and computer-readable storage medium. Background Technology

[0002] Heat pump systems provide hot water to user terminals. When the outdoor unit of the heat pump system operates in low-temperature environments, it is prone to frosting, requiring defrosting. Defrosting requires the extraction of heat from the water. Therefore, when the heat pump system enters defrosting mode, the water temperature at the user terminal will drop, thus affecting the user experience.

[0003] Some heat pump systems in related technologies incorporate a buffer water tank. The outdoor unit heats the water in the buffer tank, which then supplies the hot water to the user terminal. During defrosting, the water temperature in the buffer tank decreases due to heat absorption during the defrosting process. Therefore, while this method can reduce the degree of water temperature drop at the user terminal, it still cannot effectively solve the problem of water temperature drop at the user terminal. Summary of the Invention

[0004] This application provides a heat pump system and its control method, control device and computer-readable storage medium, which helps to improve the situation where the water temperature at the user terminal drops during defrosting of the heat pump system.

[0005] In a first aspect, this application proposes a control method for a heat pump system, the heat pump system including an outdoor unit, a first water pump, a second water pump and a buffer water tank, the outdoor unit being connected to the buffer water tank via the first water pump, the first water pump and the buffer water tank being connected to the second water pump, the second water pump being used to deliver hot water to a user terminal;

[0006] The control method includes:

[0007] When the heat pump system enters defrost mode, the water temperature in the buffer tank is obtained;

[0008] The operating status of the first water pump and the second water pump is controlled according to the water temperature to deliver hot water from the buffer tank to the user terminal, or to stop delivering hot water to the user terminal.

[0009] The control method of the heat pump system in this embodiment acquires the water temperature in the buffer tank when the heat pump system enters defrost mode, and controls whether to supply hot water to the user terminal based on the water temperature. That is, if the water temperature in the buffer tank is above the expected temperature (which is higher than the user's required temperature), the hot water in the buffer tank is sufficient to provide the heat required for defrosting and the heat required by the user terminal. In this case, the hot water in the buffer tank can be supplied to the user terminal. If the water temperature in the buffer tank does not reach the expected temperature, the supply of hot water to the user is stopped. This helps to avoid supplying relatively low-temperature water to the user terminal, which would affect the user experience.

[0010] In some embodiments, the step of controlling the operating status of the first water pump and the second water pump according to the water temperature to deliver hot water to the user terminal, or to stop delivering hot water to the user terminal, includes:

[0011] Compare the water temperature with a first preset temperature;

[0012] When the water temperature is greater than or equal to the first preset temperature, the first water pump and the second water pump are controlled to start, and the second water pump delivers water from the first water pump and the buffer tank to the user terminal.

[0013] If the water temperature is lower than the first preset temperature, the first water pump is turned on and the second water pump is turned off to stop supplying hot water to the user terminal.

[0014] In some embodiments, the step of controlling the first and second water pumps to start, so that the second water pump delivers water from the first water pump and the buffer tank to the user terminal, includes:

[0015] Control the first water pump and the second water pump to start, and make the flow rate of the first water pump less than the flow rate of the second water pump.

[0016] In some embodiments, the control method further includes:

[0017] After the defrosting mode ends, the water temperature in the buffer tank is obtained;

[0018] The first water pump and the second water pump are controlled to start, and the flow rates of the first water pump and the second water pump are controlled according to the water temperature.

[0019] In some embodiments, the step of controlling the flow rates of the first and second water pumps based on the water temperature includes:

[0020] Compare the water temperature with the second preset temperature;

[0021] When the water temperature is lower than the second preset temperature, the flow rate of the first water pump is controlled to be greater than the flow rate of the second water pump;

[0022] When the water temperature is greater than or equal to the second preset temperature, the flow rate of the first water pump is controlled to be less than or equal to the flow rate of the second water pump.

[0023] In some embodiments, the heat pump system further includes

[0024] The control method further includes:

[0025] The ambient temperature of the outdoor unit is obtained when the heat pump system is not in defrost mode;

[0026] The ambient temperature is compared with a third preset temperature;

[0027] When the ambient temperature is less than or equal to a third preset temperature, the water temperature in the buffer tank is controlled to rise.

[0028] In some embodiments, the step of controlling the temperature rise in the buffer tank includes:

[0029] Increase the power of the outdoor unit, and / or increase the flow rate of the first water pump, and / or turn on the built-in heat source of the buffer tank.

[0030] In some embodiments, the step of controlling the temperature rise in the buffer tank includes:

[0031] The water temperature in the buffer tank is controlled to rise above the first preset temperature.

[0032] A second aspect of this application provides a control device, the control device comprising:

[0033] The acquisition module is used to acquire the water temperature in the buffer tank when the heat pump system enters defrost mode;

[0034] The control module is used to control the operating status of the first water pump and the second water pump according to the water temperature, so as to deliver hot water from the buffer tank to the user terminal, or stop delivering hot water to the user terminal.

[0035] An embodiment of the third aspect of this application provides a heat pump system, the heat pump system including a memory, a processor, and a control program stored in the memory and executable on the processor, wherein the control program, when executed by the processor, implements the steps of the control method of the heat pump system in any of the above embodiments.

[0036] An embodiment of the fourth aspect of this application provides a computer-readable storage medium storing a control program that, when executed by a processor, implements the steps of the control method for the heat pump system in any of the above embodiments. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 A schematic diagram of a heat pump system provided in an embodiment of this application (when the flow rate of the first water pump is greater than the flow rate of the second water pump);

[0039] Figure 2 A schematic diagram of a heat pump system provided in an embodiment of this application (when the flow rate of the second water pump is greater than the flow rate of the first water pump);

[0040] Figure 3 A schematic flowchart of a control method for a heat pump system provided in an embodiment of this application;

[0041] Figure 4 This is a schematic diagram of the structure of a control device provided in an embodiment of this application.

[0042] Explanation of reference numerals in the attached figures:

[0043] 100. Heat pump system;

[0044] 110. Outdoor unit;

[0045] 120. First water pump;

[0046] 130. Second water pump;

[0047] 140. Buffer water tank;

[0048] 150. Control device; 151. Acquisition module; 152. Control module;

[0049] 200. User terminal. Detailed Implementation

[0050] The technical solutions in this application will be clearly and thoroughly described below with reference to the accompanying drawings. In the description of the embodiments of this application, unless otherwise stated, " / " means "or," for example, A / B can mean A or B. "And / or" in the text is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Furthermore, in the description of the embodiments of this application, "multiple" refers to two or more than two.

[0051] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as implying or suggesting relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0052] Figure 1 This is a schematic diagram of a heat pump system provided in an embodiment of this application (when the flow rate of the first water pump is greater than the flow rate of the second water pump). Figure 2 This is a schematic diagram of a heat pump system provided in one embodiment of this application (when the flow rate of the second water pump is greater than the flow rate of the first water pump). Figure 1 , Figure 2 As shown in the figure, this application provides a heat pump system 100, which includes an outdoor unit 110, a first water pump 120, a second water pump 130, and a buffer water tank 140. The outdoor unit 110 is connected to the buffer water tank 140 through the first water pump 120. Both the first water pump 120 and the buffer water tank 140 are connected to the second water pump 130, which is used to deliver hot water to the user terminal 200.

[0053] Specifically, the outdoor unit 110 may include a compressor, a condenser, a throttling device, and an evaporator. The compressor, condenser, throttling device, and evaporator are connected via refrigerant piping to form a refrigerant circulation loop. During operation, the compressor compresses the low-temperature, low-pressure refrigerant gas from the evaporator into a high-temperature, high-pressure gas and discharges it to the condenser, causing the refrigerant to liquefy in the condenser. Therefore, the compressor's function is to continuously draw in refrigerant gas from the evaporator and continuously compress the refrigerant vapor before sending it to the condenser, while maintaining the pressure difference between the suction and discharge ends, working with other components to complete the phase change of the refrigerant.

[0054] A condenser is a type of heat exchanger. High-temperature, high-pressure refrigerant vapor discharged from the compressor enters the condenser and exchanges heat with water, transferring heat from the refrigerant vapor to the water, thus heating it. Simultaneously, the high-temperature, high-pressure refrigerant vapor condenses into a liquid under a certain pressure. Therefore, the condenser is a key component in the transformation of the refrigerant from a gaseous state to a liquid state.

[0055] A throttling device is a component that reduces the pressure of the refrigerant and appropriately regulates its flow rate by suddenly reducing the channel area. Commonly used throttling devices include throttling valves, float valves, thermostatic expansion valves, electronic expansion valves, orifice plates, and capillary tubes. When liquid refrigerant flows out of the condenser and passes through the throttling device, its pressure and temperature decrease due to the throttling effect, from condensing pressure to evaporating pressure, and from condensing temperature to evaporating temperature. Therefore, the function of a throttling device is to reduce pressure.

[0056] The evaporator is also a type of heat exchanger. Its function is the opposite of the condenser; the refrigerant liquid vaporizes in the evaporator and absorbs heat from the surrounding air. Therefore, frost formation on the outdoor unit 110 mainly occurs at the location of the evaporator.

[0057] A circulating water circuit is provided between the outdoor unit 110 and the buffer water tank 140, and the circulating water circuit passes through a condenser. When the outdoor unit 110 is running, the condenser releases heat, and the circulating water absorbs the heat released by the condenser as it passes through the condenser, thus heating the water in the circulating water circuit. The heated water then returns to the buffer water tank 140. The hot water in the buffer water tank 140 can be provided to the user terminal 200, which can be a floor heating system, a domestic water tank, or a ducted air conditioner, etc.

[0058] The outdoor unit 110 is connected to the buffer tank 140 via the first water pump 120. Therefore, when the first water pump 120 is turned on, the water heated by the outdoor unit 110 enters the buffer tank 140. Both the first water pump 120 and the buffer tank 140 are connected to the second water pump 130. It can be understood that when both the first water pump 120 and the second water pump 130 are turned on, the second water pump 130 will supply hot water to the user terminal 200. If the flow rate of the first water pump 120 is greater than the flow rate of the second water pump 130, all the water supplied to the user terminal 200 by the second water pump 130 comes from the first water pump 120. Furthermore, the first water pump 120 also simultaneously supplies water to the buffer tank 140. If the flow rate of the first water pump 120 is less than the flow rate of the second water pump 130, part of the water supplied to the user terminal 200 by the second water pump 130 comes from the first water pump 120, and the other part comes from the buffer tank 140.

[0059] Based on the heat pump system 100 described above, this application provides a control method for the heat pump system 100. Figure 3 This is a flowchart illustrating the control method of the heat pump system in an embodiment of this application, as shown below. Figure 3 As shown, the control method includes:

[0060] Step S10: When the heat pump system 100 enters defrost mode, obtain the water temperature in the buffer water tank 140;

[0061] The heat pump system 100 can have multiple operating modes, such as heating mode and defrosting mode. Of course, it can also have a cooling mode depending on usage needs. In heating mode, the heat pump system 100 primarily aims to heat the water in the buffer water tank 140. Specifically, the condenser releases heat to heat the water in the circulating water circuit, and the heated water returns to the buffer water tank 140, thus achieving the purpose of continuously heating the water in the buffer water tank 140. In defrosting mode, the heat pump system 100 primarily aims to melt the frost on the outdoor unit 110. In defrosting mode, the refrigerant flow direction can be opposite to that in heating mode. The condenser switches to absorbing heat, that is, absorbing heat from the hot water in the buffer water tank 140, which can be used for defrosting.

[0062] The heat pump system 100 may also include a temperature sensor disposed in a buffer tank 140, through which the water temperature in the buffer tank 140 can be obtained.

[0063] Step S20: Control the operation status of the first water pump 120 and the second water pump 130 according to the water temperature in the buffer water tank 140, so as to deliver hot water from the buffer water tank 140 to the user terminal 200, or stop delivering hot water to the user terminal 200.

[0064] By controlling the operating status of the first water pump 120 and the second water pump 130, hot water can be supplied to the user terminal 200 or the supply of hot water can be stopped. For example, when both the first water pump 120 and the second water pump 130 are on, the second water pump 130 will supply hot water to the user terminal 200; when the first water pump 120 is on and the second water pump 130 is off, the supply of hot water to the user terminal 200 will stop.

[0065] The control method of the heat pump system 100 in this embodiment of the application obtains the water temperature in the buffer tank 140 when the heat pump system 100 enters the defrosting mode, and controls whether to supply hot water to the user terminal 200 based on the water temperature. That is, if the water temperature in the buffer tank 140 is above the expected temperature (which is higher than the temperature required by the user), the hot water in the buffer tank 140 is sufficient to provide the heat required for defrosting and the heat required by the user terminal 200. In this case, the hot water in the buffer tank 140 can be supplied to the user terminal 200. If the water temperature in the buffer tank 140 does not reach the expected temperature, the supply of hot water to the user is stopped. This helps to avoid supplying relatively low-temperature water to the user terminal 200, which would affect the user experience.

[0066] In one embodiment, the step of controlling the operating status of the first water pump 120 and the second water pump 130 according to the water temperature in the buffer tank 140 to deliver hot water to the user terminal 200 or to stop delivering hot water to the user terminal 200 specifically includes:

[0067] The water temperature in the buffer tank 140 is compared with the first preset temperature;

[0068] When the water temperature is greater than or equal to the first preset temperature, the first water pump 120 and the second water pump 130 are controlled to start, and the second water pump 130 delivers water from the first water pump 120 and the buffer water tank 140 to the user terminal 200.

[0069] When the water temperature is lower than the first preset temperature, the first water pump 120 is turned on and the second water pump 130 is turned off to stop supplying hot water to the user terminal 200.

[0070] In this embodiment, the first preset temperature corresponds to the expected temperature mentioned above. That is, the first preset temperature is higher than the temperature required by the user. For example, assuming that the user terminal 200 needs water at 50°C, then the first preset temperature can be 55°C or 60°C.

[0071] In this embodiment, the water temperature in the buffer tank 140 is compared with a first preset temperature. If the water temperature in the buffer tank 140 is greater than or equal to the first preset temperature, both the first water pump 120 and the second water pump 130 can be turned on, with the second water pump 130 supplying hot water to the user terminal 200. It should be noted that in defrosting mode, the first water pump 120 must remain on to ensure continuous heat exchange between the outdoor unit 110 and the buffer tank 140, thus guaranteeing the normal operation of the defrosting mode. While the first water pump 120 remains on, the hot water supplied to the user terminal 200 by the second water pump 130 necessarily includes water from the first water pump 120. In this embodiment, by controlling the operating states of the first water pump 120 and the second water pump 130, the hot water delivered to the user terminal 200 by the second water pump 130 comes partly from the first water pump 120 and partly from the buffer tank 140. Since the water temperature in the buffer tank 140 is greater than or equal to a first preset temperature, this ensures that even if the water from the buffer tank 140 and the water from the first water pump 120 are mixed, the mixed water will still be close to the user's required temperature. Thus, the water delivered to the user terminal 200 may meet the user's needs. If the water temperature in the buffer tank 140 is lower than the first preset temperature, the first water pump 120 is turned on and the second water pump 130 is turned off, thereby avoiding the delivery of relatively low-temperature water to the user terminal 200.

[0072] Further, the step of controlling the first water pump 120 and the second water pump 130 to start and causing the second water pump 130 to deliver water from the first water pump 120 and the buffer tank 140 to the user terminal 200 includes:

[0073] Control the first water pump 120 and the second water pump 130 to start, and make the flow rate of the first water pump 120 less than the flow rate of the second water pump 130.

[0074] In this embodiment, both the first water pump 120 and the second water pump 130 are turned on, and the flow rate of the first water pump 120 is less than the flow rate of the second water pump 130. With this setting, the hot water delivered by the second water pump 130 to the user terminal 200 can be partly from the first water pump 120 and partly from the buffer water tank 140.

[0075] In some embodiments, the control method for the heat pump system 100 further includes:

[0076] Step S30: After the defrosting mode ends, obtain the water temperature in the buffer tank 140;

[0077] Step S40: Control the first water pump 120 and the second water pump 130 to start, and control the flow rate of the first water pump 120 and the second water pump 130 according to the water temperature.

[0078] After the defrosting mode ends, the heat pump system 100 switches back to heating mode. In heating mode, since the water supplied by the first water pump 120 comes from the outdoor unit 110, the temperature of the water supplied by the first water pump 120 will be higher than the water temperature in the buffer tank 140. Therefore, the flow rate relationship between the first water pump 120 and the second water pump 130 can be adjusted according to the current water temperature in the buffer tank 140 to ensure that the water delivered to the user terminal 200 meets the user's temperature requirements.

[0079] In other words, if the water temperature in the buffer tank 140 is high, the water pumped to the user terminal 200 by the second pump 130 can include water supplied by the first pump 120 and water supplied by the buffer tank 140. If the water temperature in the buffer tank 140 is low, the water pumped to the user terminal 200 by the second pump 130 can only come from the first pump 120.

[0080] Furthermore, the step of controlling the flow rates of the first water pump 120 and the second water pump 130 based on the water temperature specifically includes:

[0081] The water temperature in the buffer tank 140 is compared with the second preset temperature;

[0082] When the water temperature is lower than the second preset temperature, the flow rate of the first water pump 120 is controlled to be greater than the flow rate of the second water pump 130;

[0083] When the water temperature is greater than or equal to the second preset temperature, the flow rate of the first water pump 120 is controlled to be less than or equal to the flow rate of the second water pump 130.

[0084] In this embodiment, the second preset temperature can be lower than the first preset temperature mentioned above. When the defrosting mode ends, the heat pump system 100 switches back to heating mode. At this time, the temperature of the water supplied by the first water pump 120 will be higher than the water temperature in the buffer tank 140. Based on the above, if the current water temperature in the buffer tank 140 is lower than the second preset temperature, that is, the water temperature in the buffer tank 140 is low, the flow rate of the first water pump 120 can be controlled to be greater than the flow rate of the second water pump 130. In this way, the water delivered to the user terminal 200 by the second water pump 130 comes only from the first water pump 120, ensuring that the water delivered to the user terminal 200 has a higher temperature. This avoids the lower-temperature water in the buffer tank 140 being supplied to the user terminal 200, which would affect the user experience. Conversely, if the water temperature in the buffer tank 140 is greater than or equal to the second preset temperature, meaning the water temperature in the buffer tank 140 is high, the flow rate of the first water pump 120 can be controlled to be less than or equal to the flow rate of the second water pump 130. In this way, the water delivered to the user terminal 200 is a mixture of water supplied by the first water pump 120 and water supplied by the buffer tank 140. When the water temperature in the buffer tank 140 is high, it helps to ensure that the temperature of the water mixed with the water supplied by the first water pump 120 is not lower than the temperature required by the user, so as to avoid affecting the user experience.

[0085] In some embodiments, the control method further includes:

[0086] The ambient temperature of the outdoor unit 110 is obtained when the heat pump system 100 is not in defrost mode;

[0087] Compare the ambient temperature with the third preset temperature;

[0088] When the ambient temperature is less than or equal to the third preset temperature, the water temperature in the buffer tank 140 is controlled to rise.

[0089] The third preset temperature can be a relatively low temperature value, such as 3℃, 4℃, 5℃, 6℃, etc. In other words, when the ambient temperature of the outdoor unit 110 drops to the third preset temperature or below, it means that the heat pump system 100 needs to start the defrosting mode.

[0090] In this embodiment, when the heat pump system 100 is not in defrost mode, it acquires the ambient temperature of the outdoor unit 110 in real time and compares it with a third preset temperature. If the ambient temperature is less than or equal to the third preset temperature, it controls the water temperature in the buffer water tank 140 to rise. That is, before starting the defrost mode, the water in the buffer water tank 140 is heated to increase its temperature. After starting the defrost mode, the water in the buffer water tank 140 is heated to provide the heat required for defrosting, and then the defrost mode is activated. This ensures that after entering the defrost mode, the water in the buffer water tank 140 provides enough heat for defrosting while also maintaining a sufficient temperature for the user terminal 200 to use.

[0091] In one embodiment, the step of controlling the rise in water temperature in the buffer tank 140 specifically includes:

[0092] Increase the power of outdoor unit 110.

[0093] When the ambient temperature of the outdoor unit 110 is less than or equal to the third preset temperature, the power of the outdoor unit 110 can be increased to store energy in the buffer water tank 140, thereby enabling the water temperature in the buffer water tank 140 to rise rapidly.

[0094] In another embodiment, the step of controlling the rise in water temperature in the buffer tank 140 specifically includes:

[0095] Increase the flow rate of the first water pump 120.

[0096] When the ambient temperature of the outdoor unit 110 is less than or equal to the third preset temperature, the flow rate of the first water pump 120 can be increased to improve the heating efficiency of the outdoor unit 110 on the water in the buffer water tank 140, thereby storing energy in the buffer water tank 140 and enabling the water temperature in the buffer water tank 140 to rise rapidly.

[0097] In another embodiment, the step of controlling the rise in water temperature in the buffer tank 140 specifically includes:

[0098] Turn on the built-in heat source of the buffer water tank 140.

[0099] For example, the built-in heat source can be an electric heater installed in the buffer water tank 140. By turning on the built-in heat source to heat the water in the buffer water tank 140, the water temperature in the buffer water tank 140 can be raised rapidly.

[0100] In some embodiments, the step of controlling the rise in water temperature in the buffer tank 140 includes:

[0101] The water temperature in the buffer tank 140 is controlled to rise above the first preset temperature.

[0102] In this embodiment, before the heat pump system 100 activates the defrost mode, the water temperature in the buffer water tank 140 is raised to above a first preset temperature. This ensures that the hot water in the buffer water tank 140 can provide the heat required for defrosting, while also meeting the user's usage needs. Thus, even after the heat pump system 100 activates the defrost mode, the water in the buffer water tank 140 can still be supplied to the user terminal 200, and it helps avoid delivering relatively low-temperature water to the user terminal 200, which could negatively impact the user experience.

[0103] Figure 4 This is a schematic diagram of the structure of a control device provided in an embodiment of this application, as shown below. Figure 4 As shown in the figure, this application embodiment also provides a control device 150, which includes an acquisition module 151 and a control module 152. The acquisition module 151 is used to acquire the water temperature in the buffer tank when the heat pump system enters the defrosting mode. The control module 152 is used to control the operating status of the first water pump and the second water pump according to the water temperature, so as to deliver hot water from the buffer tank to the user terminal 200, or stop delivering hot water to the user terminal 200.

[0104] It should be noted that the control module 152 here, in addition to its control function, also has a comparison function. Other functions of the control device 150 can be found in the description of the control method, enabling the control device 150 to implement the entire process of the control method; these will not be described in detail here.

[0105] In some embodiments, the heat pump system 100 provided in this application may further include a memory, a processor, and a control program stored in the memory and executable on the processor. When the control program is executed by the processor, it implements the steps of the control method of the heat pump system 100 in any of the above embodiments.

[0106] This application also provides a computer-readable storage medium storing a control program, which, when executed by a processor, implements the steps of the control method for the heat pump system 100 in any of the above embodiments.

[0107] This embodiment also provides a computer program product that, when run on a computer, causes the computer to perform the aforementioned steps to implement the control method described in the above embodiment.

[0108] In addition, the control device provided in the embodiments of this application may specifically be a chip, component or module. The control device may include a connected processor and a memory. The memory is used to store instructions. When the electronic device is running, the processor may call and execute the instructions to make the chip perform the methods in the above embodiments.

[0109] In this embodiment, the control device, computer-readable storage medium, control program product or chip are all used to execute the corresponding methods provided above. Therefore, the beneficial effects they can achieve can be referred to the beneficial effects in the corresponding methods provided above, and will not be repeated here.

[0110] Through the above description of the embodiments, those skilled in the art will understand that, for the sake of convenience and brevity, only the division of the above functional modules is used as an example. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0111] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the embodiments of the above methods. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0112] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A control method for a heat pump system, characterized in that, The heat pump system includes an outdoor unit, a first water pump, a second water pump, and a buffer water tank. The outdoor unit is connected to the buffer water tank via the first water pump. Both the first water pump and the buffer water tank are connected to the second water pump. The second water pump is used to deliver hot water to the user terminal. The control method includes: When the heat pump system enters defrost mode, the water temperature in the buffer tank is obtained; The operating status of the first water pump and the second water pump is controlled according to the water temperature to deliver hot water from the buffer tank to the user terminal, or to stop delivering hot water to the user terminal.

2. The control method for a heat pump system according to claim 1, characterized in that, The step of controlling the operating status of the first water pump and the second water pump according to the water temperature to deliver hot water to the user terminal, or to stop delivering hot water to the user terminal, includes: Compare the water temperature with a first preset temperature; When the water temperature is greater than or equal to the first preset temperature, the first water pump and the second water pump are controlled to start, and the second water pump delivers water from the first water pump and the buffer tank to the user terminal. If the water temperature is lower than the first preset temperature, the first water pump is turned on and the second water pump is turned off to stop supplying hot water to the user terminal.

3. The control method for a heat pump system according to claim 2, characterized in that, The step of controlling the first water pump and the second water pump to start, so that the second water pump delivers water from the first water pump and the buffer tank to the user terminal, includes: Control the first water pump and the second water pump to start, and make the flow rate of the first water pump less than the flow rate of the second water pump.

4. The control method for a heat pump system according to claim 1, characterized in that, The control method further includes: After the defrosting mode ends, the water temperature in the buffer tank is obtained; The first water pump and the second water pump are controlled to start, and the flow rates of the first water pump and the second water pump are controlled according to the water temperature.

5. The control method for a heat pump system according to claim 4, characterized in that, The step of controlling the flow rates of the first and second water pumps based on the water temperature includes: Compare the water temperature with the second preset temperature; When the water temperature is lower than the second preset temperature, the flow rate of the first water pump is controlled to be greater than the flow rate of the second water pump; When the water temperature is greater than or equal to the second preset temperature, the flow rate of the first water pump is controlled to be less than or equal to the flow rate of the second water pump.

6. The control method for a heat pump system according to claim 1, characterized in that, The control method further includes: The ambient temperature of the outdoor unit is obtained when the heat pump system is not in defrost mode; The ambient temperature is compared with a third preset temperature; When the ambient temperature is less than or equal to a third preset temperature, the water temperature in the buffer tank is controlled to rise.

7. The control method for a heat pump system according to claim 6, characterized in that, The step of controlling the rise in water temperature in the buffer tank includes: Increase the power of the outdoor unit, and / or increase the flow rate of the first water pump, and / or turn on the built-in heat source of the buffer tank.

8. The control method for a heat pump system according to claim 6, characterized in that, The step of controlling the rise in water temperature in the buffer tank includes: The water temperature in the buffer tank is controlled to rise above the first preset temperature.

9. A control device, characterized in that, include: The acquisition module is used to acquire the water temperature in the buffer tank when the heat pump system enters defrost mode; The control module is used to control the operating status of the first water pump and the second water pump according to the water temperature, so as to deliver hot water from the buffer tank to the user terminal, or stop delivering hot water to the user terminal.

10. A heat pump system, characterized in that, The system includes a memory, a processor, and a control program stored in the memory and executable on the processor, wherein the control program, when executed by the processor, implements the steps of the control method for the heat pump system as described in any one of claims 1 to 8.

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

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