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

Abstract

The application discloses a control method of a heat pump system, the heat pump system and a storage medium, relates to the technical field of heat pumps, and aims to improve the defrosting effect of a heat exchanger in a system. The heat pump system comprises a refrigerant circulating device and a liquid storage device. The refrigerant circulating device comprises a compressor and a first heat exchanger, a throttling device and a second heat exchanger connected in sequence. The second heat exchanger is arranged to adjust the temperature of liquid in the liquid storage device. The method comprises the following steps: controlling the refrigerant circulating device to operate so that the first heat exchanger is in an evaporating state and the second heat exchanger is in a condensing state; when a defrosting condition is met, controlling the refrigerant circulating device to operate to defrost the first heat exchanger, and controlling a fan corresponding to the first heat exchanger to operate at a target rotating speed. The defrosting condition indicates that the first heat exchanger has a risk of frosting.

Description

Technical Field

[0001] This application relates to the field of heat pump technology, and in particular to control methods for heat pump systems, heat pump systems, and storage media. Background Technology

[0002] In a heat pump system equipped with a liquid storage device (such as a heat pump water heater), the heat exchanger in the heat pump system can release cold or heat to regulate the temperature of the liquid in the liquid storage device.

[0003] In low-temperature environments, the heat exchangers of this heat pump system, which are in an evaporating state, are prone to frosting. Currently, when the defrosting start-up conditions are met, the fan corresponding to the frosted heat exchanger will stop, which will result in incomplete defrosting and poor defrosting effect. Summary of the Invention

[0004] The main objective of this application is to provide a control method for a heat pump system, a heat pump system, and a storage medium, with the aim of improving the defrosting effect of the heat exchanger in the system.

[0005] To achieve the above objectives, this application proposes a control method for a heat pump system. The heat pump system includes a refrigerant circulation device and a liquid storage device. The refrigerant circulation device includes a compressor and a first heat exchanger, a throttling device, and a second heat exchanger connected in sequence. The second heat exchanger is configured to regulate the temperature of the liquid in the liquid storage device. The method includes:

[0006] The refrigerant circulation device is controlled to operate so that the first heat exchanger is in an evaporation state and the second heat exchanger is in a condensation state;

[0007] When the defrosting conditions are met, the refrigerant circulation device is controlled to defrost the first heat exchanger, and the fan corresponding to the first heat exchanger is controlled to run at the target speed.

[0008] The defrosting conditions indicate that the first heat exchanger is at risk of frosting.

[0009] In one embodiment, after the step of controlling the fan corresponding to the first heat exchanger to operate at the target speed, the method further includes:

[0010] The fan speed is adjusted according to the ambient temperature of the environment where the refrigerant circulation device is located and / or the return gas temperature of the compressor and / or the temperature of the first heat exchanger.

[0011] In one embodiment, the step of controlling the fan speed adjustment based on the ambient temperature of the environment where the refrigerant circulation device is located and the return gas temperature of the compressor includes:

[0012] When the ambient temperature and the return air temperature meet preset conditions, the fan is controlled to reduce its operating speed or be turned off.

[0013] The preset condition indicates that the environment in which the refrigerant circulation device is located is not hot enough.

[0014] In one embodiment, the preset condition includes a temperature difference between the return air temperature and the ambient temperature that is greater than or equal to a preset temperature difference; or,

[0015] The preset conditions include the ambient temperature being greater than or equal to the set temperature, and the temperature difference between the return air temperature and the ambient temperature being greater than or equal to the preset temperature difference.

[0016] In one embodiment, prior to the step of controlling the fan to reduce its operating speed, the method further includes:

[0017] When the ambient temperature and the return air temperature meet the preset conditions, the speed adjustment value is determined based on the temperature difference value, and the speed adjustment value is positively correlated with the temperature difference value;

[0018] The step of controlling the fan to reduce its operating speed includes:

[0019] The fan speed is reduced according to the speed adjustment value.

[0020] In one embodiment, after the step of controlling the refrigerant circulation device to defrost the first heat exchanger, the method further includes:

[0021] When the temperature of the environment where the refrigerant circulation device is located is greater than or equal to the preset temperature, the step of controlling the fan corresponding to the first heat exchanger to operate at the target speed is executed.

[0022] If the ambient temperature of the refrigerant circulation device is lower than the preset temperature, the fan will be shut down.

[0023] In one embodiment, the step of controlling the refrigerant circulation device to defrost the first heat exchanger includes:

[0024] The throttling device is controlled to increase to the defrosting opening.

[0025] In one embodiment, the step of controlling the throttling device to increase to the defrost opening includes:

[0026] The throttling device is controlled to gradually increase its opening to the defrosting opening.

[0027] In one embodiment, the step of controlling the refrigerant circulation device to defrost the first heat exchanger further includes:

[0028] Control the compressor to operate at a defrosting frequency, and / or control the fluid regulation module to adjust the liquid flow rate from the liquid storage device into the heat exchange module to the defrosting flow rate;

[0029] The heat exchange module is connected to the second heat exchanger for heat exchange, and the heat exchange module is also connected to the liquid storage device.

[0030] In one embodiment, the step of controlling the refrigerant circulation device to defrost the first heat exchanger includes:

[0031] The throttling device is controlled to maintain its current opening, the fluid regulating module is controlled to reduce the liquid flow rate from the liquid storage device into the heat exchange module to a transitional flow rate, and the compressor is controlled to reduce its frequency to a transitional frequency.

[0032] When the first condition is met, the fluid regulation module is controlled to adjust the flow rate of the liquid flowing from the liquid storage device into the heat exchange module to the defrosting flow rate;

[0033] When the second condition is met, the compressor is controlled to operate at the defrosting frequency, and the throttling device is controlled to increase to the defrosting opening.

[0034] Wherein, the transition flow rate is greater than the defrosting flow rate.

[0035] In addition, to achieve the above objectives, this application also proposes a heat pump system, which includes a control device, a refrigerant circulation device, and a liquid storage device. The refrigerant circulation device includes a compressor and a first heat exchanger, a throttling device, and a second heat exchanger connected in sequence. The second heat exchanger is configured to regulate the temperature of the liquid in the liquid storage device.

[0036] The refrigerant circulation device is communicatively connected to the control device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor. The computer program is configured to implement the steps of the control method for the heat pump system as described above.

[0037] In addition, to achieve the above objectives, this application also proposes a storage medium, which is a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, it implements the steps of the control method for the heat pump system as described above.

[0038] One or more technical solutions proposed in this application have at least the following technical effects: Based on a heat pump system, in the refrigerant circulation device of the system, the second heat exchanger and the liquid storage device are connected by a heat exchange module. When the second heat exchanger is in a condensing state and heating the liquid in the liquid storage device, and the first heat exchanger is in an evaporating state and there is a risk of frosting, the fan corresponding to the first heat exchanger does not stop running during the defrosting process, and thus runs at the target speed. This is beneficial to enhance the heat exchange between the air and the first heat exchanger, make full use of the heat in the air, ensure that the first heat exchanger defrosts cleanly, and improve the defrosting effect of the heat exchanger in the heat pump system. Attached Figure Description

[0039] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0040] 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, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 This is a schematic diagram of the system structure of an embodiment of the heat pump system of this application;

[0042] Figure 2 This is a schematic diagram of the refrigerant flow path in the refrigerant circulation device of the heat pump system of this application;

[0043] Figure 3 This is a schematic diagram of the equipment structure of the hardware operating environment involved in the control method of the heat pump system in the embodiments of this application;

[0044] Figure 4 A flowchart illustrating an embodiment of the control method for the heat pump system of this application;

[0045] Figure 5 This is a flowchart illustrating Embodiment 2 of the control method for the heat pump system of this application.

[0046] Figure 6 This is a flowchart illustrating a third embodiment of the control method for the heat pump system of this application.

[0047] The purpose, features, and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

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

[0049] To better understand the technical solution of this application, a detailed description will be provided below in conjunction with the accompanying drawings and specific implementation methods.

[0050] The main solution of this application embodiment is: a control method based on a heat pump system, the heat pump system including a refrigerant circulation device and a liquid storage device, the refrigerant circulation device including a compressor and a first heat exchanger, a throttling device and a second heat exchanger connected in sequence, the second heat exchanger being configured to regulate the temperature of the liquid in the liquid storage device, the method including: controlling the operation of the refrigerant circulation device to make the first heat exchanger in an evaporation state and the second heat exchanger in a condensation state; under the condition of meeting defrosting, controlling the operation of the refrigerant circulation device to defrost the first heat exchanger, and controlling the fan corresponding to the first heat exchanger to operate at a target speed; wherein, the defrosting condition indicates that the first heat exchanger has a risk of frosting.

[0051] In this embodiment, for ease of description, the following description uses a heat pump system as the implementing entity.

[0052] In related technologies, heat exchangers in heat pump systems operating in low-temperature environments are prone to frosting when in an evaporating state. Currently, when the defrosting start-up conditions are met, the fan corresponding to the frosted heat exchanger will stop, which results in incomplete defrosting and poor defrosting effect.

[0053] This application provides the above solution: when the second heat exchanger is in a condensing state and heating the liquid in the liquid storage device, and the first heat exchanger is in an evaporating state and there is a risk of frosting, the fan corresponding to the first heat exchanger does not stop running during the defrosting process, and thus runs at the target speed, which is conducive to strengthening the heat exchange between the air and the first heat exchanger, making full use of the heat in the air, ensuring that the first heat exchanger defrosts cleanly, and improving the defrosting effect of the heat exchanger in the heat pump system.

[0054] This application provides a heat pump system, which in this embodiment is a heat pump water heater. In other embodiments, the heat pump system may also be a composite system that simultaneously regulates liquid temperature and air temperature, etc.

[0055] In this embodiment, refer to Figure 1 and Figure 2 , Figure 1 The middle arrow indicates the direction of liquid flow. The heat pump system includes a refrigerant circulation device 200 and a liquid storage device 300. The refrigerant circulation device 200 includes a compressor 21 and a first heat exchanger 22, a throttling device 23 and a second heat exchanger 24 connected in sequence. The second heat exchanger 24 is configured to regulate the temperature of the liquid in the liquid storage device 300.

[0056] In this embodiment, the liquid storage device 300 is a water tank. In other embodiments, the liquid storage device 300 may also be a device for storing liquids other than water.

[0057] The first heat exchanger 22 is equipped with a corresponding fan 25. When the fan 25 is turned on, it can drive the air in the environment where the first heat exchanger 22 is located to exchange heat with the first heat exchanger 22. In this embodiment, the fan 25, the first heat exchanger 22 and the second heat exchanger 24 are all located in the mounting cavity of the refrigerant circulation device 200.

[0058] In some implementations, the first heat exchanger 22 includes at least two heat exchange sections arranged side by side. In this embodiment, at least two heat exchange sections are arranged along the airflow direction driven by the fan 25, and at least two heat exchange sections are connected in series.

[0059] When the second heat exchanger 24 is in a condensing state, it can increase the temperature of the liquid in the liquid storage device 300. When the second heat exchanger 24 is in an evaporating state, it can decrease the temperature of the liquid in the liquid storage device 300.

[0060] In this embodiment, the throttling device 23 includes an electronic expansion valve.

[0061] In one implementation, refer to Figure 2 The exhaust port of compressor 21, the second heat exchanger 24, the throttling device 23, the first heat exchanger 22, and the return port of compressor 21 are connected in sequence. When compressor 21 is turned on, the refrigerant discharged by compressor 21 flows sequentially through the second heat exchanger 24, the throttling device 23, and the first heat exchanger 22 before returning to compressor 21. When the throttling device 23 is in a throttling state, the second heat exchanger 24 is in a condensing state, and the first heat exchanger 22 is in an evaporating state; when the throttling device 23 is in a non-throttling state, both the first heat exchanger 22 and the second heat exchanger 24 are in a heat-releasing state.

[0062] In another implementation, the refrigerant circulation device 200 further includes a reversing assembly (e.g., a four-way valve). The exhaust port of the compressor 21, the return port of the compressor 21, the first heat exchanger 22, and the second heat exchanger 24 are all connected to the reversing assembly. The reversing assembly has a first operating state and a second operating state. When the reversing assembly is operating in the first operating state, the exhaust port is connected to the second heat exchanger 24, and the return port is connected to the first heat exchanger 22. When the reversing assembly is operating in the second operating state, the exhaust port is connected to the first heat exchanger 22, and the return port is connected to the second heat exchanger 24. Specifically, when the reversing assembly is operating in the first operating state, if the throttling device 23 is in a throttling state, the second heat exchanger 24 is in a condensing state, and the first heat exchanger 22 is in an evaporating state. If the throttling device 23 is not in a throttling state, both the second heat exchanger 24 and the first heat exchanger 22 are in a heat-releasing state. When the reversing assembly is operating in the second operating state, if the throttling device 23 is in a throttling state, the second heat exchanger 24 is in an evaporating state, and the first heat exchanger 22 is in a condensing state.

[0063] In this embodiment, refer to Figure 1 The heat pump system also includes a heat exchange module 400, which is connected to a liquid storage device 300. The liquid in the liquid storage device 300 can flow into the heat exchange module 400 to exchange heat with the second heat exchanger 24.

[0064] In this embodiment, the heat exchange module 400 is disposed within the refrigerant circulation device 200. The refrigerant circulation device 200 and the liquid storage device 300 are disposed independently of each other. The heat exchange module 400 and the second heat exchanger 24 are integrated to form a plate heat exchanger.

[0065] A flow regulation module 301 can be installed in the connecting pipeline between the heat exchange module 400 and the liquid storage device 300 to regulate the flow rate of liquid flowing from the liquid storage device 300 into the heat exchange module 400. In this embodiment, the flow regulation module 301 includes a water pump. When the water pump is turned on, liquid from the liquid storage device 300 flows into the heat exchange module 400; when the water pump is turned off, liquid from the liquid storage device 300 stops flowing into the heat exchange module 400. The flow rate can be regulated by adjusting the current, power, or speed when the water pump is turned on.

[0066] In this embodiment, the liquid storage device 300 is provided with an outlet and a return port, which are respectively connected to the two ends of the heat exchange module 400. After the liquid flows into the heat exchange module 400 for heat exchange, it can flow back to the liquid storage device 300.

[0067] In this embodiment, the liquid outlet and the liquid return outlet are located at both ends of the liquid storage device 300.

[0068] In this embodiment, the liquid outlet and the liquid return port are arranged vertically at intervals, with the liquid outlet located at the bottom of the liquid storage device 300 and the liquid return port located at the top of the liquid storage device 300. In other implementations, the liquid outlet is located at the top of the liquid storage device 300 and the liquid return port is located at the bottom of the liquid storage device 300.

[0069] In other embodiments, the outlet and return outlet may also be spaced laterally.

[0070] In other embodiments, the second heat exchanger 24 may also be directly connected to the liquid storage device 300 for heat exchange, and the second heat exchanger 24 may be disposed on the outer wall of the liquid storage device 300 or inside the liquid storage device 300.

[0071] Reference Figure 2 and Figure 3 The heat pump system also includes a temperature sensor 01, which can be installed on the first heat exchanger 22 to detect the temperature of the first heat exchanger. For example, the temperature sensor 01 can be installed in the middle of the coil of the first heat exchanger 22 or at the refrigerant outlet, etc.

[0072] Combination Figure 3 The heat pump system also includes an environmental monitoring module 02, which can be installed on the refrigerant circulation device 200 to monitor the ambient temperature of the environment in which it is located.

[0073] Combination Figure 3 The heat pump system also includes a temperature detection module 03, which can be located on the return gas side of the compressor 21 to detect the return gas temperature of the compressor 21.

[0074] Combination Figure 3 The heat pump system also includes a control device 100, and the aforementioned refrigerant circulation device 200, flow regulation module 301, and temperature sensor 01 are all communicatively connected to the control device 100.

[0075] The control device 100 includes: at least one processor 1001; and a memory 1002 communicatively connected to the at least one processor 1001, and a timer 1003, etc.; wherein the memory 1002 stores instructions that can be executed by the at least one processor 1001, the instructions being executed by the at least one processor 1001 to enable the at least one processor 1001 to execute the control method of the heat pump system in the following embodiment.

[0076] The following is for reference. Figure 2The diagram illustrates a structural schematic of a control device 100 suitable for implementing embodiments of this application. The heat pump system in the embodiments of this application may include, but is not limited to, mobile terminals such as mobile phones, laptops, digital radio receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Descriptions), PMPs (Portable Media Players), in-vehicle terminals (e.g., in-vehicle navigation terminals), and fixed terminals such as digital TVs and desktop computers. Figure 2 The control device 100 shown is merely an example and should not impose any limitation on the functionality and scope of use of the embodiments of this application.

[0077] like Figure 2 As shown, the control device 100 may include a processor 1001 (e.g., a central processing unit, a graphics processing unit, etc.), which can perform various appropriate actions and processes according to a program stored in memory 1002. The program in memory 1002 may be a program in read-only memory (ROM) or a program loaded from a storage device into random access memory (RAM). The RAM also stores various programs and data required for the operation of the control device 100. The processor 1001 and memory 1002 (ROM and RAM) are interconnected via a bus. Input / output (I / O) interfaces are also connected to the bus. Typically, the following systems can be connected to the I / O interface: input devices including, for example, touchscreens, touchpads, keyboards, mice, image sensors, microphones, accelerometers, gyroscopes, etc.; output devices including, for example, liquid crystal displays (LCDs), speakers, vibrators, etc.; storage devices including, for example, magnetic tapes, hard disks, etc.; and communication devices. The communication device allows the control device 100 to communicate wirelessly or wiredly with other devices to exchange data. Although the control unit 100 with various systems is shown in the figure, it should be understood that it is not required to implement or have all of the systems shown. More or fewer systems may be implemented or have alternatively.

[0078] Specifically, according to the embodiments disclosed in this application, the method flow described in the following embodiments can be implemented as a computer software program. For example, the embodiments disclosed in this application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing program code for performing the methods shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network via a communication device, or installed from memory 1002. When the computer program is executed by processor 1001, it performs the functions defined in the control method of the heat pump system of the embodiments disclosed in this application.

[0079] The heat pump system provided in this application, employing the control method of the heat pump system in the following embodiments, can solve the technical problem of how to improve the defrosting effect of the heat exchanger in the system. Compared with the prior art, the beneficial effects of the heat pump system provided in this application are the same as the beneficial effects of the control method of the heat pump system provided in the following embodiments, and other technical features of this heat pump system are the same as those disclosed in the method of the following embodiments, and will not be repeated here.

[0080] It should be noted that the executing entity in this embodiment can be a computing service device with data processing, network communication, and program execution functions, such as a tablet computer, personal computer, or mobile phone, or an electronic device or heat pump system capable of performing the above functions. The following description uses a heat pump system as an example to illustrate this embodiment and the subsequent embodiments.

[0081] Based on this, embodiments of this application provide a control method for a heat pump system, referring to... Figure 4 , Figure 4 This is a flowchart illustrating the first embodiment of the control method for the heat pump system of this application.

[0082] In this embodiment, the control method of the heat pump system includes steps S10 to S20:

[0083] Step S10: Control the operation of the refrigerant circulation device to make the first heat exchanger be in an evaporation state and the second heat exchanger be in a condensation state;

[0084] During the execution of S10, the flow regulation module is controlled to ensure that the liquid in the storage device flows into the heat exchange module to exchange heat with the second heat exchanger and then flows back to the storage device. During this process, the liquid flow rate into the heat exchange module can be a pre-set fixed flow rate, or a flow rate determined based on the actual operating conditions of the system, such as the user-set temperature and / or the user-set hot water volume.

[0085] In one implementation, the compressor's exhaust port, second heat exchanger, throttling device, first heat exchanger, and compressor return port are sequentially connected in the refrigerant circulation device. When the compressor is turned on and the throttling device is in a throttling state, the refrigerant discharged by the compressor flows sequentially through the second heat exchanger, the throttling device, and the first heat exchanger before returning to the compressor. The first heat exchanger is in an evaporation state, and the second heat exchanger is in a condensation state, which can heat the liquid flowing through the heat exchange module.

[0086] In another implementation, the refrigerant circulation device also includes a reversing assembly. The compressor's exhaust port, compressor's return port, first heat exchanger, and second heat exchanger are all connected to the reversing assembly. When the reversing assembly is in a first operating state, the throttling device is in a throttling state, and the compressor is turned on, the refrigerant discharged by the compressor flows sequentially through the second heat exchanger, the throttling device, and the first heat exchanger before returning to the compressor. The first heat exchanger is in an evaporating state, and the second heat exchanger is in a condensing state, which can heat the liquid flowing through the heat exchange module.

[0087] Step S20: When the defrosting conditions are met, control the refrigerant circulation device to defrost the first heat exchanger, and control the fan corresponding to the first heat exchanger to run at the target speed; wherein, the defrosting conditions indicate that there is a risk of frost formation on the first heat exchanger.

[0088] Defrosting conditions may include the operating parameters of the refrigerant circulation device itself and / or the environmental parameters of the environment in which the refrigerant circulation device is located, when the first heat exchanger is frosted and defrosting is required. For example, the continuous operating time of the first heat exchanger in the evaporation state and the second heat exchanger in the condensation state is greater than or equal to a preset duration and / or the ambient temperature is lower than a preset ambient temperature threshold and / or the temperature of the first heat exchanger is lower than a preset temperature threshold, etc.

[0089] During the defrosting mode of the first heat exchanger in the operation of the refrigerant circulation device, the second heat exchanger can be in either an evaporation or condensation state.

[0090] In this embodiment, both the first and second heat exchangers are in a heat-releasing state during defrosting mode operation. During the defrosting process of the first heat exchanger, the second heat exchanger can maintain heat supply to the liquid in the storage device. The throttling device includes an electronic expansion valve, which can control the opening of the electronic expansion valve to increase to the defrosting opening, thereby increasing the temperature of the refrigerant flowing into the first heat exchanger and providing heat for defrosting the first heat exchanger. In this embodiment, the throttling device is in a non-throttling state when operating at the defrosting opening. The defrosting opening can be a preset fixed opening (e.g., the maximum opening), or it can be an opening determined based on the actual operating conditions of the system, such as the frosting state of the first heat exchanger and the liquid temperature in the storage device.

[0091] In addition to increasing the opening of the electronic expansion valve to the defrosting opening, the defrosting mode may also include: controlling the flow regulation module to adjust the liquid flow rate from the liquid storage device into the heat exchange module to the defrosting flow rate, and / or controlling the compressor to operate at the defrosting frequency. The defrosting flow rate here can be a preset fixed flow rate, or a flow rate determined based on the temperature difference between the current liquid temperature in the liquid storage device and the user-set temperature. The defrosting flow rate is less than or equal to the liquid flow rate from the liquid storage device into the heat exchange module before the defrosting conditions are met; the defrosting frequency is less than, equal to, or higher than the compressor's operating frequency before the defrosting conditions are met.

[0092] The target speed can be a pre-set fixed speed or a speed determined based on the actual operating conditions of the heat pump system. The target speed can be greater than, equal to, or less than the initial speed of the fan when defrosting conditions are met.

[0093] This embodiment provides a control method for a heat pump system. When the second heat exchanger is in a condensing state and heating the liquid in the storage device, and the first heat exchanger is in an evaporating state and there is a risk of frosting, the fan corresponding to the first heat exchanger does not stop running during the defrosting process, and runs at the target speed. This is beneficial to enhance the heat exchange between the air and the first heat exchanger, make full use of the heat in the air, ensure that the first heat exchanger defrosts cleanly, and improve the defrosting effect of the heat exchanger in the heat pump system.

[0094] Based on any of the above embodiments, in the second embodiment of this application, the same or similar content as the above embodiments can be referred to the above description, and will not be repeated hereafter. Based on this, refer to... Figure 5 After the step of controlling the fan corresponding to the first heat exchanger to operate at the target speed, the method further includes:

[0095] Step S30: Adjust the operating speed of the fan according to the ambient temperature of the environment where the refrigerant circulation device is located and / or the return gas temperature of the compressor and / or the temperature of the first heat exchanger.

[0096] The ambient temperature is detected by an environmental sensor installed on the refrigerant circulation unit. The return gas temperature is detected by a temperature detection module installed on the return gas side of the compressor. The temperature of the first heat exchanger is detected by a temperature sensor.

[0097] The ambient temperature and / or return gas temperature and / or the temperature of the first heat exchanger can be the temperature at the current moment when the refrigerant circulation device is running, or the temperature when the refrigerant circulation device meets the defrosting conditions.

[0098] The fan can be shut down, its speed adjusted, or its direction of operation adjusted based on the ambient temperature and / or return air temperature and / or the temperature of the first heat exchanger.

[0099] In one implementation, the fan is shut down when the ambient temperature and / or return air temperature and / or the temperature of the first heat exchanger meet preset conditions. The preset conditions may indicate insufficient heat in the ambient air, and may include target ranges corresponding to the ambient temperature and return air temperature, or a target relationship between the ambient temperature and return air temperature, etc.

[0100] In another implementation, the fan speed can be controlled based on at least one of the ambient temperature, the return gas temperature, and the temperature of the first heat exchanger. For example, the fan speed can be adjusted based on the temperature difference between the ambient temperature and the return gas temperature.

[0101] In another implementation, the target speed of the outdoor fan can be determined based on the ambient temperature and the return air temperature in the first and second turns. The first turn is when the fan blows air toward the first heat exchanger, and the second turn is when the fan blows air away from the first heat exchanger.

[0102] In this embodiment, by means of the above method, it can be ensured that under the control of the fan, there is sufficient heat to quickly defrost the first heat exchanger, thereby effectively improving the defrosting efficiency.

[0103] In one feasible implementation, the step of controlling the fan to adjust its operating speed based on the ambient temperature of the environment where the refrigerant circulation device is located and the return gas temperature of the compressor includes: controlling the fan to reduce its operating speed or shut down when the ambient temperature and the return gas temperature meet preset conditions; wherein the preset conditions indicate that the heat in the environment where the refrigerant circulation device is located is insufficient.

[0104] In this embodiment, if the ambient temperature and return air temperature do not meet the preset conditions, the fan is controlled to maintain the current speed.

[0105] In this embodiment, the preset conditions include the temperature difference between the return air temperature and the ambient temperature being greater than or equal to a preset temperature difference; or, the preset conditions include the ambient temperature being greater than or equal to a set temperature, and the temperature difference between the return air temperature and the ambient temperature being greater than or equal to a preset temperature difference.

[0106] The preset temperature difference is used to determine whether the ambient air heat in the environment where the refrigerant circulation device is located is sufficient. In this embodiment, the ambient temperature during the defrosting operation of the refrigerant circulation device is higher than the return gas temperature. As the defrosting time increases, the return gas temperature rises continuously, and the temperature difference value decreases continuously. When the temperature difference value is greater than or equal to the preset temperature difference, the ambient air heat is considered insufficient; when the temperature difference value is less than the preset temperature difference, the ambient air heat is considered sufficient.

[0107] The preset temperature difference can be a fixed value set in advance, or it can be determined based on the actual situation of the heat pump system. In this embodiment, the preset temperature difference is determined based on the ambient temperature, and the preset temperature difference is negatively correlated with the ambient temperature. The correspondence between the ambient temperature and the preset temperature difference can be a fixed pre-set relationship, or it can be obtained based on the temperature of the liquid currently flowing into the heat exchange module; different liquid temperatures correspond to different correspondences.

[0108] In this embodiment, after controlling the fan to reduce its operating speed or shut down, the fan maintains its current state until the defrosting end condition is met.

[0109] In this embodiment, when the ambient temperature and the return air temperature meet preset conditions, a speed adjustment value is determined based on the temperature difference value, and the speed adjustment value is positively correlated with the temperature difference value; the fan is controlled to reduce its operating speed based on the speed adjustment value. In other implementations, the speed adjustment value can also be a preset fixed value.

[0110] After controlling the fan to reduce its operating speed, the process can return to the step of controlling the fan to reduce its operating speed or shut down when the ambient temperature and the return air temperature meet the preset conditions, until the fan is shut down.

[0111] In this embodiment, when the ambient air heat is insufficient for defrosting the first heat exchanger, the fan is turned off or operates at a reduced speed. This helps reduce heat dissipation from the first heat exchanger, allowing more heat to remain in the area where the outdoor heat exchanger is located, thus improving the defrosting efficiency of the first heat exchanger. When the ambient air heat is sufficient, the fan continues to operate, which helps to fully utilize the air heat for defrosting, improving defrosting efficiency while saving system energy consumption.

[0112] In other embodiments, the target speed of the fan can also be determined based on the ambient temperature, and the fan can be controlled to run at the target speed. When the ambient temperature is greater than a preset ambient temperature, a first speed is determined as the target speed; when the ambient temperature is less than or equal to the preset ambient temperature, a second speed is determined as the target speed; wherein, the first speed is greater than the second speed.

[0113] In other embodiments, the fan may be controlled to reduce its operating speed or be turned off when the temperature difference between the first heat exchanger and the ambient temperature is greater than or equal to a preset temperature difference.

[0114] Based on any of the above embodiments, in the third embodiment of this application, the same or similar content as the above embodiments can be referred to the above description, and will not be repeated hereafter. Based on this, refer to... Figure 6 If step S21 is defined as controlling the refrigerant circulation device to defrost the first heat exchanger under the condition that defrosting is met, then after step S21, the following steps are also included:

[0115] Step S22: When the temperature of the environment where the refrigerant circulation device is located is greater than or equal to the preset temperature, execute the step of controlling the fan corresponding to the first heat exchanger to operate at the target speed.

[0116] Step S23: If the ambient temperature of the refrigerant circulation device is lower than the preset temperature, control the fan to shut down.

[0117] The temperature of the environment where the refrigerant circulation device is located can be the same as the ambient temperature mentioned above, or it can be the temperature measured at different times.

[0118] After step S23, the fan remains off until the refrigerant circulation device meets the defrosting termination conditions.

[0119] In this embodiment, by means of the above method, the fan will remain on during the defrosting stage when there is enough heat in the space where the refrigerant circulation device is located to defrost the first heat exchanger; otherwise, the fan will be turned off during the defrosting stage, thereby effectively improving the defrosting efficiency of the first heat exchanger.

[0120] In other embodiments, when the temperature difference between the ambient temperature of the refrigerant circulation device and the set temperature is greater than a preset value and the ambient temperature of the refrigerant circulation device is rising, the fan corresponding to the first heat exchanger is controlled to operate at the target speed; when the temperature difference between the ambient temperature of the refrigerant circulation device and the set temperature is less than or equal to a preset value or the ambient temperature of the refrigerant circulation device is falling, the fan is controlled to shut down.

[0121] Based on any of the above embodiments, in the fourth embodiment of this application, the same or similar content as the above embodiments can be referred to the above description, and will not be repeated hereafter. Based on this, the step of controlling the operation of the refrigerant circulation device to defrost the first heat exchanger includes: controlling the throttling device to increase to the defrosting opening.

[0122] The throttling device here can increase the opening at a preset rate to the defrosting opening, or it can increase it in a stepwise manner to the defrosting opening.

[0123] The defrosting opening can vary depending on the thickness of the frost on the first heat exchanger.

[0124] In this embodiment, by increasing the opening degree of the throttling device, the throttling and pressure reduction effect of the throttling device can be effectively reduced, increasing the temperature of the refrigerant flowing into the first heat exchanger and providing heat for defrosting the first heat exchanger, thus achieving the effect of rapid melting of thin frost. Furthermore, when the throttling device is increased in a stepwise manner to the defrosting opening degree, the system operating noise can be effectively reduced, achieving defrosting while ensuring that the heating requirements of the liquid storage device are met.

[0125] In one feasible implementation, the step of controlling the operation of the refrigerant circulation device to defrost the first heat exchanger further includes: controlling the compressor to operate at a defrosting frequency, and / or controlling the fluid regulating module to adjust the liquid flow rate from the liquid storage device into the heat exchange module to the defrosting flow rate; wherein the heat exchange module is heat-exchange connected to the second heat exchanger, and the heat exchange module is connected to the liquid storage device.

[0126] When defrosting conditions are met, the throttling device, compressor, and fluid regulation module can be continuously adjusted from the initial operating parameters to the corresponding defrosting parameters simultaneously, or they can be adjusted from the initial operating parameters to the corresponding defrosting parameters in stages.

[0127] In this embodiment, by using a throttling device, a compressor, and a fluid regulation module, the temperature of the first heat exchanger can be raised to the temperature required for defrosting, thereby effectively improving the defrosting efficiency of the first heat exchanger and the energy efficiency of the system.

[0128] In one feasible implementation, the step of controlling the operation of the refrigerant circulation device to defrost the first heat exchanger includes: controlling the throttling device to maintain its current opening, controlling the fluid regulating module to reduce the liquid flow rate from the liquid storage device into the heat exchange module to a transition flow rate, and controlling the compressor to reduce its frequency to a transition frequency; when a first condition is met, controlling the fluid regulating module to adjust the liquid flow rate from the liquid storage device into the heat exchange module to the defrosting flow rate; when a second condition is met, controlling the compressor to operate at the defrosting frequency, and controlling the throttling device to increase its opening to the defrosting degree; wherein the defrosting frequency is less than, equal to, or higher than the transition frequency, and the transition flow rate is greater than the defrosting flow rate.

[0129] The first and second conditions may include the runtime reaching the corresponding set duration or receiving a control command, etc. The runtime can start from when the defrosting conditions are met.

[0130] In this embodiment, before the refrigerant circulation device enters the defrosting stage, the liquid flow rate flowing into the heat exchange module is reduced to a transitional flow rate, which is beneficial for heat storage during the defrosting stage. The compressor is reduced to a transitional frequency, which helps to avoid the second heat exchanger from overheating. The throttling device maintains its current opening, which helps to reduce the noise generated when the throttling device, fan, and compressor are adjusted simultaneously. Based on this, it is beneficial to improve the defrosting effect while ensuring the reliability of the system and reducing operating noise.

[0131] After the refrigerant regulation module, compressor, and throttling device all operate with the corresponding defrosting parameters, when the refrigerant circulation device meets the defrosting end conditions, each component can be controlled to return to the operating parameters before meeting the defrosting conditions. In particular, during the process of the compressor and throttling device returning to the operating parameters before meeting the defrosting conditions, the corresponding operating parameters are adjusted in a stepwise manner.

[0132] It should be noted that the above examples are only for understanding this application and do not constitute a limitation on the control method of the heat pump system of this application. Any simple modifications based on this technical concept are within the protection scope of this application.

[0133] This application provides a computer-readable storage medium having computer-readable program instructions (i.e., a computer program) stored thereon, the computer-readable program instructions being used to execute the control method of the heat pump system in the above embodiments.

[0134] The computer-readable storage medium provided in this application may be, for example, a USB flash drive, but is not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or any combination thereof. More specific examples of computer-readable storage media may include, but are not limited to: electrical connections having one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. In this embodiment, the computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, system, or device. The program code contained on the computer-readable storage medium may be transmitted using any suitable medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination thereof.

[0135] The aforementioned computer-readable storage medium may be included in the heat pump system or may exist independently without being assembled into the heat pump system.

[0136] The aforementioned computer-readable storage medium carries one or more programs that, when executed by the heat pump system, cause the heat pump system to perform the following process: controlling the operation of the refrigerant circulation device to put the first heat exchanger in an evaporating state and the second heat exchanger in a condensing state; and, when defrosting conditions are met, controlling the operation of the refrigerant circulation device to defrost the first heat exchanger and controlling the fan corresponding to the first heat exchanger to operate at a target speed; wherein, the defrosting conditions indicate that there is a risk of frosting on the first heat exchanger.

[0137] Computer program code for performing the operations of this application can be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, and C++, and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network—including a Local Area Network (LAN) or a Wide Area Network (WAN)—or can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0138] The readable storage medium provided in this application is a computer-readable storage medium that stores computer-readable program instructions (i.e., a computer program) for executing the control method of the above-described heat pump system, which can solve the technical problem of how to improve the defrosting effect of the heat exchanger in the system. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided in this application are the same as the beneficial effects of the control method of the heat pump system provided in the above embodiments, and will not be repeated here.

[0139] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0140] It should be understood that the various parts disclosed in this application can be implemented using hardware, software, firmware, or a combination thereof. Modules described in the embodiments of this application can be implemented in software or hardware. The names of modules do not necessarily limit the specific unit itself. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0141] The above descriptions are merely some embodiments of this application and do not limit the patent scope of this application. Any equivalent structural transformations made based on the technical concept of this application and the content of this specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application. Therefore, the protection scope 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 a refrigerant circulation device and a liquid storage device. The refrigerant circulation device includes a compressor and a first heat exchanger, a throttling device, and a second heat exchanger connected in sequence. The second heat exchanger is configured to regulate the temperature of the liquid in the liquid storage device. The method includes: The refrigerant circulation device is controlled to operate so that the first heat exchanger is in an evaporation state and the second heat exchanger is in a condensation state; When the defrosting conditions are met, the refrigerant circulation device is controlled to defrost the first heat exchanger, and the fan corresponding to the first heat exchanger is controlled to run at the target speed. The defrosting conditions indicate that the first heat exchanger is at risk of frosting.

2. The method as described in claim 1, characterized in that, After the step of controlling the fan corresponding to the first heat exchanger to operate at the target speed, the method further includes: The fan speed is adjusted according to the ambient temperature of the environment where the refrigerant circulation device is located and / or the return gas temperature of the compressor and / or the temperature of the first heat exchanger.

3. The method as described in claim 2, characterized in that, The step of controlling the fan speed adjustment based on the ambient temperature of the environment where the refrigerant circulation device is located and the return gas temperature of the compressor includes: When the ambient temperature and the return air temperature meet preset conditions, the fan is controlled to reduce its operating speed or be turned off. The preset condition indicates that the environment in which the refrigerant circulation device is located is not hot enough.

4. The method as described in claim 3, characterized in that, The preset conditions include the temperature difference between the return air temperature and the ambient temperature being greater than or equal to a preset temperature difference; or, The preset conditions include the ambient temperature being greater than or equal to the set temperature, and the temperature difference between the return air temperature and the ambient temperature being greater than or equal to the preset temperature difference.

5. The method as described in claim 3, characterized in that, Before the step of controlling the fan to reduce its operating speed, the method further includes: When the ambient temperature and the return air temperature meet the preset conditions, the rotation speed adjustment value is determined based on the temperature difference value, and the rotation speed adjustment value is positively correlated with the temperature difference value; The step of controlling the fan to reduce its operating speed includes: The fan speed is reduced according to the speed adjustment value.

6. The method as described in claim 1, characterized in that, After the step of controlling the refrigerant circulation device to defrost the first heat exchanger, the method further includes: When the temperature of the environment where the refrigerant circulation device is located is greater than or equal to the preset temperature, the step of controlling the fan corresponding to the first heat exchanger to operate at the target speed is executed. If the ambient temperature of the refrigerant circulation device is lower than the preset temperature, the fan will be shut down.

7. The method as described in claim 1, characterized in that, The step of controlling the operation of the refrigerant circulation device to defrost the first heat exchanger includes: The throttling device is controlled to increase to the defrosting opening.

8. The method as described in claim 7, characterized in that, The step of controlling the throttling device to increase to the defrosting opening includes: The throttling device is controlled to gradually increase its opening to the defrosting opening.

9. The method as described in claim 7, characterized in that, The step of controlling the operation of the refrigerant circulation device to defrost the first heat exchanger further includes: Control the compressor to operate at a defrosting frequency, and / or control the fluid regulation module to adjust the liquid flow rate from the liquid storage device into the heat exchange module to the defrosting flow rate; The heat exchange module is connected to the second heat exchanger for heat exchange, and the heat exchange module is also connected to the liquid storage device.

10. The method as described in claim 9, characterized in that, The step of controlling the operation of the refrigerant circulation device to defrost the first heat exchanger includes: The throttling device is controlled to maintain its current opening, the fluid regulating module is controlled to reduce the liquid flow rate from the liquid storage device into the heat exchange module to a transitional flow rate, and the compressor is controlled to reduce its frequency to a transitional frequency. When the first condition is met, the fluid regulation module is controlled to adjust the flow rate of the liquid flowing from the liquid storage device into the heat exchange module to the defrosting flow rate; When the second condition is met, the compressor is controlled to operate at the defrosting frequency, and the throttling device is controlled to increase to the defrosting opening. Wherein, the transition flow rate is greater than the defrosting flow rate.

11. A heat pump system, characterized in that, The heat pump system includes a control device, a refrigerant circulation device, and a liquid storage device. The refrigerant circulation device includes a compressor and a first heat exchanger, a throttling device, and a second heat exchanger connected in sequence. The second heat exchanger is configured to regulate the temperature of the liquid in the liquid storage device. The refrigerant circulation device is communicatively connected to the control device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor. The computer program is configured to implement the steps of the control method for the heat pump system as described in any one of claims 1 to 10.

12. A storage medium, characterized in that, The storage medium is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, it implements the steps of the control method for the heat pump system as described in any one of claims 1 to 10.

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