Control method, controller and storage medium of two-stage jet-reheat heat pump system

Abstract

Embodiments of the present application provide a control method and controller of a two-stage jet augmenting heat pump system and a storage medium. The two-stage jet augmenting heat pump system comprises a jet augmenting compressor, a first-stage heat exchanger, a second-stage heat exchanger, a first throttling component for controlling a jet augmenting circuit of the first-stage heat exchanger, and a second throttling component for controlling a suction circuit of the second-stage heat exchanger. The method comprises: in a refrigeration windless mode, obtaining an anti-freezing protection number; and controlling switch states of the first throttling component and the second throttling component according to the anti-freezing protection number. According to the embodiments of the present application, the switch states of the first throttling component and the second throttling component are controlled according to the anti-freezing protection number, so as to control refrigerant flow of the jet augmenting circuit of the first-stage heat exchanger and the suction circuit of the second-stage heat exchanger, thereby avoiding the phenomenon of condensation due to too low evaporation temperature of an indoor heat exchanger.

Description

Technical Field

[0001] This application relates to the field of air conditioner technology, and in particular to a control method, controller and storage medium for a two-stage jet enthalpy-increasing heat pump system. Background Technology

[0002] In related technologies, as people's pursuit of air conditioning comfort continues to increase, the "windless" function has become widespread in air conditioners. However, different air conditioning systems control the "windless" function differently. If not controlled properly, the indoor unit's evaporation temperature may be too low, potentially causing condensation and leading to customer complaints. Therefore, to avoid condensation and user complaints, anti-freeze protection is particularly important. When developing anti-freeze protection strategies, it is necessary to fully consider the user's actual usage scenarios and ensure the scientific and reasonable nature of the control logic. Especially in residential central air conditioning systems, when only one low-load indoor unit is turned on, condensation is more likely to occur because the outdoor unit has a larger capacity than the indoor unit. Therefore, currently available air conditioners still struggle to effectively control anti-freeze under the "windless" function, ensuring users' reasonable needs for "windless" cooling. Summary of the Invention

[0003] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes a control method, controller, and storage medium for a two-stage jet enthalpy-enhancing heat pump system, designed to avoid condensation caused by excessively low evaporation temperature of the indoor heat exchanger.

[0004] In a first aspect, embodiments of this application provide a control method for a two-stage vapor injection enthalpy-increasing heat pump system. The two-stage vapor injection enthalpy-increasing heat pump system includes an enthalpy-injecting compressor, a primary heat exchanger, a secondary heat exchanger, a first throttling component for controlling the enthalpy-injecting circuit of the primary heat exchanger, and a second throttling component for controlling the suction circuit of the secondary heat exchanger. The method includes: In the fanless cooling mode, count the number of times the anti-freeze protection is applied. The switching states of the first throttling component and the second throttling component are controlled according to the number of anti-freeze protection cycles.

[0005] According to some embodiments of this application, controlling the switching states of the first throttling component and the second throttling component based on the number of anti-freeze protection cycles includes: When both the first throttling component and the second throttling component are in the on state, the switching state of the first throttling component and the second throttling component is controlled according to the first anti-freeze protection count and the first threshold, wherein the first anti-freeze protection count is the number of anti-freeze protection counts when both the first throttling component and the second throttling component are in the on state.

[0006] According to some embodiments of this application, controlling the switching states of the first throttling component and the second throttling component based on the first anti-freeze protection count and the first threshold includes at least one of the following: When the number of times the first anti-freeze protection is less than the first threshold, both the first throttling component and the second throttling component are kept in the open state. When the number of times the first anti-freeze protection is greater than or equal to the first threshold, the first throttling component is kept open, and the second throttling component is closed.

[0007] According to some embodiments of this application, controlling the switching states of the first throttling component and the second throttling component based on the number of anti-freeze protection cycles includes: When the first throttling component is in the on state and the second throttling component is in the off state, the on / off state of the first throttling component and the second throttling component is controlled according to the second anti-freeze protection count and the second threshold, wherein the second anti-freeze protection count is the number of anti-freeze protection counts when the first throttling component is in the on state and the second throttling component is in the off state.

[0008] According to some embodiments of this application, controlling the switching states of the first throttling component and the second throttling component based on the second anti-freeze protection count and the second threshold includes at least one of the following: When the number of times the second anti-freeze protection is less than the second threshold, the first throttling component is kept open, and the second throttling component is kept closed. When the number of times the second anti-freeze protection is greater than or equal to the second threshold, both the first throttling component and the second throttling component are controlled to be in the off state.

[0009] According to some embodiments of this application, it is characterized by including: When both the first throttling component and the second throttling component are in the off state, the frequency of the injection enthalpy compressor is controlled according to the third anti-freeze protection count and the third threshold, wherein the third anti-freeze protection count is the number of anti-freeze protection counts when both the first throttling component and the second throttling component are in the off state.

[0010] According to some embodiments of this application, controlling the frequency of the injection enthalpy compressor based on the third anti-freeze protection count and the third threshold includes at least one of the following: If the number of times the third antifreeze protection is less than the third threshold, the frequency of the enthalpy compressor is kept constant. If the number of times the third antifreeze protection is greater than or equal to the third threshold, the real-time operating frequency of the enthalpy injection compressor is obtained, and the enthalpy injection compressor is controlled according to the real-time operating frequency and the minimum operating frequency.

[0011] According to some embodiments of this application, controlling the injection enthalpy compressor based on the real-time operating frequency and the minimum operating frequency includes at least one of the following: When the real-time operating frequency is less than or equal to the minimum operating frequency, the enthalpy compressor is controlled to stop. When the real-time operating frequency is greater than the minimum operating frequency, the frequency of the injection enthalpy compressor is reduced based on the first step length.

[0012] According to some embodiments of this application, after reducing the frequency of the injection enthalpy compressor based on the first step length, the method further includes: Obtain the fourth number of antifreeze protection cycles after reducing the frequency of the injection enthalpy compressor; The frequency of the injection compressor is controlled based on the fourth anti-freeze protection count and the fourth threshold.

[0013] According to some embodiments of this application, controlling the frequency of the injection enthalpy compressor based on the fourth anti-freeze protection count and the fourth threshold includes at least one of the following: If the number of times the fourth antifreeze protection is less than the fourth threshold, the frequency of the enthalpy compressor is kept constant. When the fourth anti-freeze protection count is greater than or equal to the fourth threshold, if the reduced frequency of the enthalpy-injected compressor is less than or equal to the minimum operating frequency, the enthalpy-injected compressor is controlled to stop. If the reduced frequency of the enthalpy-injected compressor is greater than the minimum operating frequency, the frequency of the enthalpy-injected compressor is reduced based on the first step.

[0014] Secondly, embodiments of this application provide a controller, including: a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor runs the computer program, it performs the control method of the two-stage jet enthalpy-enhancing heat pump system as described in the first aspect above.

[0015] Thirdly, embodiments of this application provide a two-stage vapor injection enthalpy-enhancing heat pump system, including the controller described in the second aspect.

[0016] Fourthly, embodiments of this application provide a computer-readable storage medium storing computer-executable instructions for performing a control method for a two-stage jet enthalpy-enhancing heat pump system as described in the first aspect above.

[0017] According to the technical solution of the embodiments of this application, at least the following beneficial effects are achieved: This application proposes a control method, controller, and storage medium for a two-stage vapor injection enthalpy-increasing heat pump system. The two-stage vapor injection enthalpy-increasing heat pump system includes an enthalpy-increasing compressor, a primary heat exchanger, a secondary heat exchanger, a first throttling component for controlling the enthalpy-increasing circuit of the primary heat exchanger, and a second throttling component for controlling the suction circuit of the secondary heat exchanger. The method includes: acquiring the number of anti-freeze protection cycles in a windless cooling mode; and controlling the switching states of the first and second throttling components based on the number of anti-freeze protection cycles. This application embodiment controls the refrigerant flow rate in the enthalpy-increasing circuit of the primary heat exchanger and the suction circuit of the secondary heat exchanger by controlling the switching states of the first and second throttling components based on the number of anti-freeze protection cycles, thereby avoiding condensation due to excessively low evaporation temperatures of the indoor heat exchanger.

[0018] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0019] The accompanying drawings are used to provide a further understanding of the technical solutions of this application and constitute a part of the specification. They are used together with the embodiments of this application to explain the technical solutions of this application and do not constitute a limitation on the technical solutions of this application.

[0020] Figure 1 This is a schematic diagram of the structure of a two-stage jet enthalpy-enhancing heat pump system provided in one embodiment of this application; Figure 2 This is a flowchart of a control method for a two-stage jet enthalpy-enhancing heat pump system provided in one embodiment of this application; Figure 3 This is a flowchart of a control method for a two-stage jet enthalpy-enhancing heat pump system provided in another embodiment of this application; Figure 4 This is a flowchart of a control method for a two-stage jet enthalpy-enhancing heat pump system provided in another embodiment of this application; Figure 5 This is a flowchart of a control method for a two-stage jet enthalpy-enhancing heat pump system provided in another embodiment of this application; Figure 6 This is a flowchart of a control method for a two-stage jet enthalpy-enhancing heat pump system provided in another embodiment of this application; Figure 7 This is a flowchart of a control method for a two-stage jet enthalpy-enhancing heat pump system provided in another embodiment of this application; Figure 8 This is a flowchart of a control method for a two-stage jet enthalpy-enhancing heat pump system provided in another embodiment of this application; Figure 9This is a flowchart of a control method for a two-stage jet enthalpy-enhancing heat pump system provided in another embodiment of this application; Figure 10 This is a flowchart of a control method for a two-stage jet enthalpy-enhancing heat pump system provided in another embodiment of this application; Figure 11 This is a flowchart of a control method for a two-stage jet enthalpy-enhancing heat pump system provided in another embodiment of this application; Figure 12 This is an overall flowchart of the control method for a two-stage jet enthalpy-enhancing heat pump system provided in one embodiment of this application; Figure 13 This is a schematic diagram of a controller for implementing a control method for a two-stage jet enthalpy-enhancing heat pump system, according to an embodiment of this application. Detailed Implementation

[0021] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0022] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0023] In the description of this application, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0024] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0025] In some cases, as people's pursuit of air conditioning comfort continues to increase, the "windless" function has become widespread in air conditioners. However, different air conditioning systems control the "windless" function differently. If not controlled properly, the indoor unit's evaporation temperature may be too low, potentially causing condensation and leading to customer complaints. Therefore, to avoid condensation and user complaints, anti-freeze protection is particularly important. When developing anti-freeze protection strategies, it is necessary to fully consider the user's actual usage scenarios and ensure the scientific and reasonable nature of the control logic. Especially in residential central air conditioning systems, when only one low-load indoor unit is turned on, condensation is more likely to occur because the outdoor unit has a larger capacity than the indoor unit. Therefore, currently available air conditioners still struggle to effectively control anti-freeze under the "windless" function, ensuring users' reasonable "windless" cooling needs.

[0026] Based on the above, this application proposes a control method, controller, and storage medium for a two-stage jet enthalpy-increasing heat pump system, aiming to avoid condensation caused by excessively low evaporation temperature of the indoor heat exchanger.

[0027] The various embodiments of the two-stage jet enthalpy-enhancing heat pump system of this application will be further described below with reference to the accompanying drawings.

[0028] like Figure 1 As shown, Figure 1 This is a schematic diagram of the structure of a two-stage jet enthalpy-enhancing heat pump system provided in one embodiment of this application.

[0029] In one embodiment, the two-stage jet enthalpy-increasing heat pump system of this application includes a jet enthalpy compressor 100, a primary heat exchanger 110, a secondary heat exchanger 120, a first throttling assembly 130 for controlling the jet enthalpy circuit of the primary heat exchanger 110, and a second throttling assembly 140 for controlling the suction circuit of the secondary heat exchanger 120.

[0030] It should be noted that the injection enthalpy circuit is connected to the injection enthalpy compressor 100 through the first throttling assembly 130, and the intake circuit is connected to the injection enthalpy compressor 100 through the second throttling assembly 140.

[0031] It should be noted that the first throttling component 130 is used to control the refrigerant flow rate in the injection enthalpy circuit, and the second throttling component 140 is used to control the refrigerant flow rate in the suction circuit.

[0032] It is worth noting that, in this embodiment of the application, the refrigerant flow rate of the injection enthalpy circuit and the suction circuit is controlled by controlling the switching state of the first throttling component 130 and the second throttling component 140, thereby avoiding condensation due to the low evaporation temperature of the indoor heat exchanger.

[0033] In one embodiment, the two-stage jet enthalpy-increasing heat pump system of this application further includes an outdoor heat exchanger 200, an indoor heat exchanger (not shown in the figure), a main throttling assembly 300, a main filter 400, a first filter 500, a second filter 600, an electronically controlled radiator 700 for dissipating heat from the electronic control board, a first liquid storage tank 800 and a second liquid storage tank 900, a gas-liquid separator 1000, and a four-way valve 1100.

[0034] Understandably, the main throttling component 300 can control the refrigerant flow rate into the compressor return port through the outdoor heat exchanger.

[0035] It is understood that the main throttling assembly 400 may include an outdoor electronic expansion valve, or a capillary tube and a check valve. This application embodiment does not specifically limit the components of the main throttling assembly 400.

[0036] It is understood that the first throttling component 130 may include a primary injection enthalpy flow path electronic expansion valve, or a capillary tube and a solenoid valve. The embodiments of this application do not specifically limit the components of the first throttling component 130.

[0037] It is understood that the second throttling assembly 140 may include a two-stage injection enthalpy flow path electronic expansion valve, or a capillary tube and a solenoid valve. The embodiments of this application do not specifically limit the components of the second throttling assembly 140.

[0038] Understandably, the main filter 400, the first filter 500, and the second filter 600 work together in the air conditioner to ensure the cleanliness and normal operation of the system through multi-stage filtration.

[0039] The filter in the refrigerant circulation loop of an air conditioner is a crucial component. Its main function is to remove impurities and particles from the system, ensuring smooth refrigerant flow and thus maintaining the system's normal operation and efficiency. The following are some key functions of filters in air conditioning systems: Impurity Removal: Various impurities may exist in the system, such as metal particles, welding slag, and dust. These impurities may originate from the manufacturing process or be generated during use due to component wear. Filters effectively intercept these impurities, preventing them from entering the system and causing damage.

[0040] Protecting Components: Many components in a system, such as the compressor, evaporator, and condenser, can be damaged by clogging or wear caused by impurities. Filters extend the lifespan of these components by removing these potential threats.

[0041] Maintaining efficiency: When impurities in the refrigerant circulation loop are removed by the filter, the refrigerant flows more smoothly, and heat exchange efficiency is improved. This helps to improve the overall performance of the air conditioner, including cooling and heating effects.

[0042] Preventing blockages: The tiny channels in the refrigerant circulation loop are easily clogged by impurities, hindering refrigerant flow. A filter prevents this, ensuring smooth system circulation.

[0043] System maintenance: The filter itself is a consumable and requires regular inspection and replacement. By checking the condition of the filter, the maintenance status of the system and potential problems can be assessed.

[0044] Environmental considerations: Filters help reduce refrigerant leakage, thereby minimizing environmental impact. Refrigerant leaks not only affect air conditioning performance but can also harm the environment.

[0045] In summary, the filter in the refrigerant circulation loop of an air conditioner is a key component for ensuring stable system operation and high efficiency. Regular inspection and maintenance of the filter can effectively prevent malfunctions and improve the reliability and efficiency of the air conditioning system.

[0046] Understandably, by having the refrigerant enter at the inlet of the electronically controlled radiator 700, pass through it, and then flow from the outlet through the main throttling component 400 to the outdoor heat exchanger 200, efficient heat transfer and dissipation are achieved. This helps ensure the stable operation of the electronic control board and prevents performance degradation or malfunctions caused by overheating. Furthermore, the refrigerant flow in the electronically controlled radiator 700 carries away the heat dissipated by the power devices on the electronic control board, ensuring the normal operation of the power devices.

[0047] The liquid receiver (also known as the liquid tank or receiver) in the refrigerant circulation loop of an air conditioner is a crucial component. It performs multiple functions in the heating system, including storing refrigerant, stabilizing pressure, and separating gas and liquid. The main roles of the liquid receiver in an air conditioning system are as follows: Refrigerant Storage: The receiver tank provides a place to store excess refrigerant. During the operation of the heating system, some refrigerant may fail to enter the evaporator or condenser in time. The receiver tank can temporarily store this refrigerant to ensure the normal operation of the system.

[0048] Pressure Stabilization: The receiver-dryer helps stabilize the pressure in the system. When the heating system starts or stops, the pressure may change. The receiver-dryer absorbs these pressure fluctuations, reducing the impact on the compressor and other components.

[0049] Gas-Liquid Separation: The receiver-liquid tank separates the refrigerant into gaseous and liquid states. When the refrigerant exits the compressor, it may be in a high-pressure, hot gaseous state. The receiver-liquid tank allows the hot gaseous refrigerant to be cooled and partially liquefied, thereby reducing the amount of gas entering the condenser and improving heat exchange efficiency.

[0050] Reduced pulsation and noise: The receiver-dryer reduces refrigerant pulsation in the system, thereby lowering system noise and vibration. This is crucial for improving air conditioner comfort and minimizing environmental disturbance.

[0051] Filtration and drying: The receiver tank is typically equipped with filtration and drying functions to remove impurities and moisture from the refrigerant. This helps prevent ice blockage and corrosion problems in the system, extending the service life of system components.

[0052] System maintenance and repair: The presence of the refrigerant receiver makes the maintenance and repair of the heating system much more convenient. The receiver provides a convenient access point when refrigerant needs to be added or replaced. At the same time, the system's operating status can be assessed by observing the refrigerant condition in the receiver.

[0053] In summary, the receiver liner plays a crucial role in the refrigerant circulation loop of an air conditioner. It not only helps improve the overall efficiency and stability of the system but also contributes to maintaining its long-term health and reliability. Regular inspection and maintenance of the receiver liner to ensure its good working condition is essential for maintaining the performance of the air conditioning system.

[0054] Understandably, the gas-liquid separator 1000 is used to separate the gas and liquid in the refrigerant, thereby ensuring that the gas and liquid in the refrigerant flow according to the needs of the air conditioner.

[0055] The gas-liquid separator in an air conditioner's refrigerant circulation loop is a component specifically designed to separate the gaseous and liquid components of the refrigerant. Its main function is to ensure that the refrigerant is in a suitable liquid state before entering the compressor, thereby improving system efficiency and stability. The following are some key functions of the gas-liquid separator in an air conditioning system: Reducing the risk of liquid slugging: If liquid refrigerant is drawn into the compressor during operation, liquid slugging may occur, which can damage the compressor. A gas-liquid separator reduces the risk of liquid slugging by separating gaseous and liquid refrigerant, ensuring that only gaseous refrigerant enters the compressor.

[0056] Improved Energy Efficiency: Gas-liquid separators help improve system energy efficiency. When refrigerant enters the compressor in a gaseous state, its compression efficiency is higher. By separating the liquid refrigerant, it ensures that the compressor draws in gaseous refrigerant, thereby improving the overall system energy efficiency.

[0057] Stable system operation: The gas-liquid separator helps maintain stable system operation by stabilizing the state of the refrigerant entering the compressor. This helps avoid pressure fluctuations and system failures caused by unstable refrigerant conditions.

[0058] Compressor protection: Liquid refrigerant entering the compressor can damage internal components such as valve plates and piston rings. A gas-liquid separator protects the compressor from damage by effectively separating the liquid refrigerant.

[0059] Optimized heat exchange: The gas-liquid separator ensures that the liquid refrigerant can fully participate in the heat exchange process, improving the heat exchange efficiency of the evaporator and condenser.

[0060] Reduced maintenance costs: By reducing the risk of liquid slugging and damage to the compressor, gas-liquid separators help reduce the maintenance costs and frequency of repairs for air conditioning systems.

[0061] System Diagnosis: The operating status of the gas-liquid separator can serve as an indicator of the system's health. If abnormalities are found inside the gas-liquid separator, it may indicate other problems in the system, requiring further inspection and maintenance.

[0062] In summary, the gas-liquid separator plays a crucial role in the refrigerant circulation loop of an air conditioner. By ensuring that the refrigerant enters the compressor in the proper condition, it helps improve the system's efficiency, stability, and reliability. Regularly inspecting and maintaining the gas-liquid separator to ensure its good working condition is essential for maintaining the performance of the air conditioning system.

[0063] Understandably, the four-way valve 1100 ensures the correct flow of refrigerant, thereby ensuring the normal operation of the air conditioner.

[0064] Based on the two-stage jet enthalpy-enhancing heat pump system described in the above embodiments, the following presents various embodiments of the control method for the two-stage jet enthalpy-enhancing heat pump system of this application.

[0065] like Figure 2 As shown, Figure 2 This is a flowchart of a control method for a two-stage vapor injection enthalpy-enhancing heat pump system provided in one embodiment of this application; the control method can be applied to the two-stage vapor injection enthalpy-enhancing heat pump system of the above embodiment, including but not limited to steps S110 and S120.

[0066] Step S110: In the cooling windless mode, obtain the number of times the anti-freeze protection is applied; Step S120: Control the switching state of the first throttling component and the second throttling component according to the number of anti-freeze protection cycles.

[0067] In one embodiment, when the air conditioner is in a cooling windless mode, firstly, the number of times the anti-freeze protection is applied is obtained; secondly, the on / off state of the first throttling component and the second throttling component is controlled by the number of times the anti-freeze protection is applied.

[0068] It should be noted that the above-mentioned "cooling windless mode" refers to the windless function mode when the air conditioner is in cooling mode.

[0069] It is worth noting that, in this embodiment, the switching states of the first and second throttling components are controlled by the number of anti-freeze protection cycles, thereby controlling the refrigerant flow in the injection enthalpy circuit and the suction circuit, and thus avoiding condensation due to the excessively low evaporation temperature of the indoor heat exchanger.

[0070] like Figure 3 As shown, Figure 3 This is a flowchart of a control method for a two-stage jet enthalpy-enhancing heat pump system provided in another embodiment of this application; regarding the control of the switching state of the first throttling component and the second throttling component according to the number of anti-freeze protection cycles in the above step S120, it includes, but is not limited to, steps S210 and S220.

[0071] Step S210: When both the first throttling component and the second throttling component are in the open state; Step S220: Control the switching state of the first throttling component and the second throttling component according to the first anti-freeze protection count and the first threshold, wherein the first anti-freeze protection count is the number of anti-freeze protection counts when both the first throttling component and the second throttling component are in the on state.

[0072] In one embodiment, when the air conditioner is in a cooling windless mode, this embodiment controls the switching state of the first and second throttling components by means of a first anti-freeze protection count and a first threshold when both the first and second throttling components are in the on state. The first anti-freeze protection count is the number of anti-freeze protection counts when both the first and second throttling components are in the on state.

[0073] It should be noted that, since the embodiments of this application control the switching states of the first and second throttling components through the first anti-freeze protection count and the first threshold, the refrigerant flow in the injection enthalpy circuit and the suction circuit can be controlled more precisely, enabling the air conditioner to operate more efficiently in the cooling windless mode and reducing unnecessary energy consumption. In addition, by responding promptly to the anti-freeze protection count and adjusting the switching states of the first and second throttling components, condensation caused by excessively low evaporation temperature of the indoor heat exchanger can be avoided, thereby extending the service life of the air conditioning system and reducing the frequency of maintenance and component replacement.

[0074] like Figure 4 As shown, Figure 4 This is a flowchart of a control method for a two-stage jet enthalpy-increasing heat pump system provided in another embodiment of this application; regarding the control of the switching state of the first throttling component and the second throttling component based on the first anti-freeze protection count and the first threshold in step S220 above, it includes, but is not limited to, steps S310 and S320.

[0075] Step S310: When the number of first anti-freeze protection cycles is less than the first threshold, control both the first throttling component and the second throttling component to remain open; Step S320: When the number of first anti-freeze protection cycles is greater than or equal to the first threshold, control the first throttling component to remain open and control the second throttling component to close.

[0076] In one embodiment, when the air conditioner is in a cooling windless mode, if the number of first anti-freeze protection cycles is less than a first threshold, both the first throttling component and the second throttling component remain open; if the number of first anti-freeze protection cycles is greater than or equal to the first threshold, the first throttling component remains open, and the second throttling component is controlled to close.

[0077] It should be noted that when the number of times the first anti-freeze protection is less than the first threshold, it means that the air conditioner is in normal working condition and there is no risk of the indoor heat exchanger evaporation temperature being too low. At this time, keeping the first throttling component and the second throttling component in the open state can ensure the refrigerant flow in the injection enthalpy circuit and the suction circuit, and maintain a high-efficiency cooling effect.

[0078] Additionally, it should be noted that when the number of times the first anti-freeze protection is greater than or equal to the first threshold, it indicates that the air conditioner is at risk of having an excessively low evaporation temperature in the indoor heat exchanger. In this case, the first throttling component is kept open while the second throttling component is kept closed. This reduces the refrigerant flow to the enthalpy compressor by closing the second throttling component, thereby increasing the evaporation temperature of the indoor heat exchanger and preventing condensation due to the excessively low evaporation temperature of the indoor heat exchanger.

[0079] It is understood that the first threshold mentioned above can be 2, or it can be set according to the actual situation. This application embodiment does not specifically limit the size of the first threshold.

[0080] like Figure 5 As shown, Figure 5 This is a flowchart of a control method for a two-stage jet enthalpy-enhancing heat pump system provided in another embodiment of this application; the control method also includes, but is not limited to, steps S410 and S420.

[0081] Step S410: When the first throttling component is in the open state and the second throttling component is in the closed state; Step S420: Control the switching state of the first throttling component and the second throttling component according to the second anti-freeze protection count and the second threshold, wherein the second anti-freeze protection count is the number of anti-freeze protections when the first throttling component is in the open state and the second throttling component is in the closed state.

[0082] In one embodiment, when the air conditioner is in a cooling windless mode, this embodiment controls the on / off state of the first and second throttling components by means of a second anti-freeze protection count and a second threshold when the first throttling component is in the on state and the second throttling component is in the off state. The second anti-freeze protection count is the number of anti-freeze protection counts when the first throttling component is in the on state and the second throttling component is in the off state.

[0083] It should be noted that, since the embodiments of this application control the switching states of the first and second throttling components through the second anti-freeze protection count and the second threshold, the refrigerant flow in the injection enthalpy circuit and the suction circuit can be controlled more precisely, enabling the air conditioner to operate more efficiently in the cooling windless mode and reducing unnecessary energy consumption. In addition, by responding to the anti-freeze protection count in a timely manner and adjusting the switching states of the first and second throttling components, condensation caused by excessively low evaporation temperature of the indoor heat exchanger can be avoided, thereby extending the service life of the air conditioning system and reducing the frequency of maintenance and component replacement.

[0084] like Figure 6 As shown, Figure 6 This is a flowchart of a control method for a two-stage jet enthalpy-enhancing heat pump system provided in another embodiment of this application; regarding the control of the switching state of the first throttling component and the second throttling component based on the second anti-freeze protection count and the second threshold in step S420 above, it includes, but is not limited to, steps S510 and S520.

[0085] Step S510: When the number of times the second anti-freeze protection is less than the second threshold, control the first throttling component to remain open and control the second throttling component to remain closed. Step S520: When the number of times the second anti-freeze protection is greater than or equal to the second threshold, control both the first throttling component and the second throttling component to be in the off state.

[0086] In one embodiment, when the air conditioner is in a cooling windless mode, if the number of times the second anti-freeze protection is less than the second threshold, the first throttling component is kept in the open state and the second throttling component is kept in the closed state; if the number of times the second anti-freeze protection is greater than or equal to the second threshold, both the first throttling component and the second throttling component are controlled to be in the closed state.

[0087] It should be noted that when the number of times the second anti-freeze protection is less than the second threshold, it means that the air conditioner is in normal working condition and there is no risk of the indoor heat exchanger evaporation temperature being too low. At this time, keeping the first throttling component in the open state and the second throttling component in the closed state can ensure the refrigerant flow in the enthalpy injection circuit and maintain a high-efficiency cooling effect.

[0088] Additionally, it should be noted that when the number of times the second anti-freeze protection is less than the second threshold, it indicates that the air conditioner is at risk of having an excessively low evaporation temperature in the indoor heat exchanger. At this time, the first and second throttling components are both closed, thereby reducing the refrigerant flow to the enthalpy compressor and increasing the evaporation temperature of the indoor heat exchanger, thus preventing condensation due to the excessively low evaporation temperature of the indoor heat exchanger.

[0089] It is understood that the second threshold mentioned above can be 2, or it can be set according to the actual situation. This application embodiment does not specifically limit the size of the second threshold.

[0090] In addition, it is understood that, regarding the first threshold and the second threshold mentioned above, the first threshold may be equal to the second threshold, the first threshold may be greater than the second threshold, or the first threshold may be less than the second threshold. The embodiments of this application do not specifically limit the relationship between the first threshold and the second threshold.

[0091] like Figure 7 As shown, Figure 7 This is a flowchart of a control method for a two-stage jet enthalpy-enhancing heat pump system provided in another embodiment of this application; the control method also includes, but is not limited to, steps S610 and S620.

[0092] Step S610: When both the first throttling component and the second throttling component are in the off state; Step S620: Control the frequency of the injection enthalpy compressor according to the third anti-freeze protection count and the third threshold, wherein the third anti-freeze protection count is the number of anti-freeze protection counts when both the first throttling component and the second throttling component are in the off state.

[0093] In one embodiment, when the air conditioner is in a cooling windless mode, this embodiment controls the frequency of the enthalpy compressor by means of a third anti-freeze protection count and a third threshold when both the first and second throttling components are in the off state. The third anti-freeze protection count is the number of anti-freeze protection counts when both the first and second throttling components are in the off state.

[0094] It should be noted that, since the embodiments of this application control the frequency of the injection enthalpy compressor through the third anti-freeze protection number and the third threshold when both the first throttling component and the second throttling component are closed, the evaporation temperature of the indoor heat exchanger can be kept in a suitable temperature range, thus avoiding condensation due to the indoor heat exchanger evaporation temperature being too low.

[0095] like Figure 8 As shown, Figure 8 This is a flowchart of a control method for a two-stage jet enthalpy-increasing heat pump system provided in another embodiment of this application; regarding the frequency of the jet enthalpy compressor controlled according to the third anti-freeze protection number and the third threshold in step S620 above, it includes, but is not limited to, steps S710 and S720.

[0096] Step S710: If the number of times the third antifreeze protection is less than the third threshold, keep the frequency of the enthalpy compressor unchanged; Step S720: When the number of times the third antifreeze protection is greater than or equal to the third threshold, obtain the real-time operating frequency of the enthalpy injection compressor, and control the enthalpy injection compressor according to the real-time operating frequency and the minimum operating frequency.

[0097] In one embodiment, when the air conditioner is in a cooling windless mode, if the number of times the third anti-freeze protection is less than the third threshold, the frequency of the enthalpy-injecting compressor is kept constant. If the number of times the third anti-freeze protection is greater than or equal to the third threshold, the real-time operating frequency of the enthalpy-injecting compressor is obtained, and the compressor is controlled by the real-time operating frequency and the minimum operating frequency.

[0098] It should be noted that when the number of times the third anti-freeze protection is less than the third threshold, it means that the air conditioner is in normal working condition and there is no risk of the indoor heat exchanger evaporation temperature being too low. At this time, keeping the frequency of the injection enthalpy compressor unchanged can ensure the normal operation of the air conditioner.

[0099] Additionally, it should be noted that when the number of times the third anti-freeze protection is greater than or equal to the third threshold, it indicates that the air conditioner is at risk of having an excessively low evaporation temperature in the indoor heat exchanger. In this case, by controlling the enthalpy compressor through real-time operating frequency and minimum operating frequency, the evaporation temperature of the indoor heat exchanger can be increased, thereby avoiding condensation due to the excessively low evaporation temperature of the indoor heat exchanger.

[0100] like Figure 9 As shown, Figure 9This is a flowchart of a control method for a two-stage vapor injection enthalpy-increasing heat pump system provided in another embodiment of this application; regarding the control of the vapor injection compressor based on the real-time operating frequency and the minimum operating frequency in step S720 above, it includes, but is not limited to, steps S810 and S820.

[0101] Step S810: When the real-time operating frequency is less than or equal to the minimum operating frequency, control the enthalpy compressor to stop. Step S820: When the real-time operating frequency is greater than the minimum operating frequency, reduce the frequency of the injection enthalpy compressor based on the first step.

[0102] In one embodiment, when the air conditioner is in a cooling windless mode, the enthalpy compressor is stopped when the real-time operating frequency is less than or equal to the minimum operating frequency; when the real-time operating frequency is greater than the minimum operating frequency, the frequency of the enthalpy compressor is reduced based on the first step length.

[0103] It should be noted that when the real-time operating frequency of the enthalpy-injected compressor is less than or equal to the minimum operating frequency, controlling the enthalpy-injected compressor to stop increases the evaporation temperature of the indoor heat exchanger, thereby preventing condensation due to excessively low evaporation temperature of the indoor heat exchanger. When the real-time operating frequency of the enthalpy-injected compressor is greater than the minimum operating frequency, reducing the frequency of the enthalpy-injected compressor based on the first step can increase the evaporation temperature of the indoor heat exchanger, thereby preventing condensation due to excessively low evaporation temperature of the indoor heat exchanger.

[0104] It is understood that the aforementioned third threshold can be 1, or it can be set according to the actual situation. This application embodiment does not impose any specific limitations on it.

[0105] like Figure 10 As shown, Figure 10 This is a flowchart of a control method for a two-stage jet enthalpy-increasing heat pump system provided in another embodiment of this application; after reducing the frequency of the jet enthalpy compressor based on the first step length in step S820 above, steps S910 and S920 are included, but are not limited to.

[0106] Step S910: Obtain the fourth number of antifreeze protection cycles after reducing the frequency of the injection enthalpy compressor; Step S920: Control the frequency of the injection enthalpy compressor according to the fourth anti-freeze protection count and the fourth threshold.

[0107] In one embodiment, when the air conditioner is in a cooling windless mode, after reducing the frequency of the enthalpy compressor based on the first step, this embodiment of the application will obtain the fourth anti-freeze protection count and control the frequency of the enthalpy compressor according to the fourth anti-freeze protection count and the fourth threshold.

[0108] It should be noted that, in this embodiment of the application, after reducing the frequency of the enthalpy-injecting compressor in the first step, the frequency of the enthalpy-injecting compressor is controlled according to the fourth anti-freeze protection number and the fourth threshold, so that the evaporation temperature of the indoor heat exchanger is kept in a suitable range, and condensation is prevented from occurring due to the evaporation temperature of the indoor heat exchanger being too low.

[0109] like Figure 11 As shown, Figure 11 This is a flowchart of a control method for a two-stage jet enthalpy-enhancing heat pump system provided in another embodiment of this application; regarding the above step S920, it includes, but is not limited to, steps S1010 and S1020.

[0110] Step S1010: If the number of times the fourth antifreeze protection is less than the fourth threshold, keep the frequency of the enthalpy compressor unchanged; Step S1020: When the fourth anti-freeze protection count is greater than or equal to the fourth threshold, if the reduced enthalpy compressor frequency is less than or equal to the minimum operating frequency, control the enthalpy compressor to stop. If the reduced enthalpy compressor frequency is greater than the minimum operating frequency, reduce the enthalpy compressor frequency based on the first step.

[0111] In one embodiment, when the air conditioner is in a cooling windless mode, if the number of times the fourth anti-freeze protection is less than the fourth threshold, the frequency of the enthalpy-injected compressor is kept constant. If the number of times the fourth anti-freeze protection is greater than or equal to the fourth threshold, and the reduced frequency of the enthalpy-injected compressor is less than or equal to the minimum operating frequency, the enthalpy-injected compressor is controlled to stop. If the reduced frequency of the enthalpy-injected compressor is greater than the minimum operating frequency, the frequency of the enthalpy-injected compressor is reduced based on the first step.

[0112] It should be noted that when the number of times the fourth anti-freeze protection is less than the fourth threshold, it means that the air conditioner is in normal working condition and there is no risk of the indoor heat exchanger evaporation temperature being too low. At this time, keeping the frequency of the enthalpy compressor constant can ensure the normal operation of the air conditioner.

[0113] Additionally, it should be noted that when the fourth anti-freeze protection count is greater than or equal to the fourth threshold, it indicates a risk of the indoor heat exchanger evaporation temperature being too low. In this case, the enthalpy compressor is controlled based on the reduced frequency of the enthalpy compressor and the minimum operating frequency. When the reduced frequency of the enthalpy compressor is less than or equal to the minimum operating frequency, the enthalpy compressor is shut down, thereby increasing the evaporation temperature of the indoor heat exchanger and preventing condensation due to the low evaporation temperature. When the reduced frequency of the enthalpy compressor is greater than the minimum operating frequency, the frequency of the enthalpy compressor is reduced based on the first step, which increases the evaporation temperature of the indoor heat exchanger, thus preventing condensation due to the low evaporation temperature.

[0114] It is understood that the fourth threshold mentioned above can be 1, or it can be set according to the actual situation. This application embodiment does not specifically limit the value of the fourth threshold.

[0115] It is understood that the length of the first step can be set according to the actual situation, and the embodiments of this application do not specifically limit the size of the first step.

[0116] like Figure 12 As shown, Figure 12 This is an overall flowchart of a control method for a two-stage vapor injection enthalpy-enhancing heat pump system according to an embodiment of this application; this control method can be applied to the two-stage vapor injection enthalpy-enhancing heat pump system of the above embodiment, and the specific steps are as follows: Step S1110: The air conditioner is in the cooling windless mode, and both the first throttling component and the second throttling component are in the open state; Step S1120: Determine whether the first number of anti-freeze protection cycles is greater than or equal to 2; If the first anti-freeze protection count is less than 2, proceed to step S1121; If the first number of anti-freeze protection cycles is greater than or equal to 2, proceed to step S1122; Step S1121: The air conditioner is running normally, and both the first throttling component and the second throttling component are kept in the open state; Step S1122: Control the first throttling component to remain open, and control the second throttling component to close; Step S1130: Determine whether the second anti-freeze protection count is greater than or equal to 2; If the number of second anti-freeze protection cycles is less than 2, proceed to step S1131; If the second anti-freeze protection count is greater than or equal to 2, proceed to step S1132; Step S1131: The air conditioner is running normally, controlling the first throttling component to remain open and the second throttling component to remain closed; Step S1132: Control both the first throttling component and the second throttling component to be in the closed state; Step S1140: Determine whether the third anti-freeze protection count is greater than or equal to 1; If the number of third anti-freeze protection cycles is less than 1, proceed to step S1141; If the third anti-freeze protection count is greater than or equal to 1, proceed to step S1150; Step S1141: The air conditioner operates normally, keeping the frequency of the enthalpy compressor constant, and controlling the first and second throttling components to remain closed; Step S1150: Determine whether the real-time operating frequency is greater than the minimum operating frequency; If the real-time operating frequency is less than or equal to the minimum operating frequency, proceed to step S1151; If the real-time operating frequency is greater than the minimum operating frequency, proceed to step S1160; Step S1151: Control the enthalpy injection compressor to stop; Step S1152: Based on the first step, reduce the frequency of the injection enthalpy compressor; Step S1160: Determine whether the fourth anti-freeze protection count is greater than or equal to 1; If the fourth anti-freeze protection count is less than 1, proceed to step S1161; If the fourth anti-freeze protection count is greater than or equal to 1, proceed to step S1170; Step S1161: The air conditioner operates normally, keeping the frequency of the enthalpy compressor constant, and controlling the first throttling component and the second throttling component to remain closed; Step S1170: Determine whether the real-time operating frequency is greater than the minimum operating frequency; If the real-time operating frequency is less than or equal to the minimum operating frequency, proceed to step S1171; If the real-time operating frequency is greater than the minimum operating frequency, proceed to step S1152; Step S1171: Control the enthalpy compressor to stop.

[0117] It should be noted that the first number of anti-freeze protection cycles is the number of anti-freeze protection cycles when both the first and second throttling components are in the open state; the second number of anti-freeze protection cycles is the number of anti-freeze protection cycles when the first throttling component is in the open state and the second throttling component is in the closed state; the third number of anti-freeze protection cycles is the number of anti-freeze protection cycles when both the first and second throttling components are in the closed state; and the fourth number of anti-freeze protection cycles is the number of anti-freeze protection cycles after the frequency of the injection enthalpy compressor is reduced.

[0118] It is worth noting that, in this embodiment, the on / off state of the first and second throttling components is controlled by the number of anti-freeze protection cycles, thereby controlling the refrigerant flow in the enthalpy injection circuit of the first-stage heat exchanger and the suction circuit of the second-stage heat exchanger, thus avoiding condensation due to excessively low evaporation temperature of the indoor heat exchanger. In addition, this embodiment can also control the enthalpy injection compressor by controlling the number of anti-freeze protection cycles and the real-time operating frequency of the enthalpy injection compressor, thereby keeping the evaporation temperature of the indoor heat exchanger within a suitable range and preventing condensation due to excessively low evaporation temperature of the indoor heat exchanger.

[0119] like Figure 13 As shown, Figure 13 This is a schematic diagram of the structure of a controller for executing a control method for a two-stage jet enthalpy-enhancing heat pump system according to an embodiment of this application. The controller 700 implemented in this application includes: a processor 710, a memory 720, and a computer program stored in the memory 720 and executable on the processor 710, wherein... Figure 13 The example uses a processor 710 and a memory 720.

[0120] The processor 710 and memory 720 can be connected via a bus or other means. Figure 13 Taking the example of a connection between China and Israel via a bus.

[0121] Memory 720, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer-executable programs. Furthermore, memory 720 may include high-speed random access memory, and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some embodiments, memory 720 may optionally include remotely located memories 720 relative to processor 710, which can be connected to controller 700 via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0122] Those skilled in the art will understand that Figure 13 The device structure shown does not constitute a limitation on the controller 700 and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0123] exist Figure 13 In the controller 700 shown, the processor 710 can be used to call the control program stored in the memory 720 to implement the control method described above. Specifically, the non-transitory software program and instructions required to implement the control method of the above embodiment are stored in the memory 720, and when executed by the processor 710, the control method of the above embodiment is executed.

[0124] It is worth noting that since the controller 700 of this application embodiment can execute the control method of any of the above embodiments, the specific implementation method and technical effect of the controller 700 of this application embodiment can refer to the specific implementation method and technical effect of the control method of any of the above embodiments.

[0125] Furthermore, one embodiment of this application provides a two-stage vapor injection enthalpy-enhancing heat pump system, which includes the controller described in the above embodiment.

[0126] It is worth noting that, since the two-stage vapor injection enthalpy-enhancing heat pump system of this application includes the controller of the above-described embodiments, and the controller of the above-described embodiments is capable of executing the control method of the two-stage vapor injection enthalpy-enhancing heat pump system of any of the above-described embodiments, the specific implementation method and technical effects of the two-stage vapor injection enthalpy-enhancing heat pump system of this application can be referred to the specific implementation method and technical effects of the control method of the two-stage vapor injection enthalpy-enhancing heat pump system of any of the above-described embodiments.

[0127] Furthermore, one embodiment of this application provides a computer-readable storage medium storing computer-executable instructions for performing the control method described above. Exemplarily, the above-described control method is performed... Figures 2 to 12 The methods and steps in the text.

[0128] It is worth noting that, since the computer-readable storage medium of this application embodiment can execute the control method of any of the above embodiments, the specific implementation and technical effects of the computer-readable storage medium of this application embodiment can be referred to the specific implementation and technical effects of the control method of any of the above embodiments.

[0129] It will be understood by those skilled in the art that all or some of the steps and systems in the methods disclosed above can be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components can be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, which can include computer storage media (or non-transitory media) and communication media (or transient media). As is known to those skilled in the art, the term computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disc (DVD) or other optical disc storage, magnetic cartridges, magnetic tape, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and is accessible to a computer. Furthermore, as is known to those skilled in the art, communication media typically include computer-readable instructions, data structures, program modules, or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information delivery medium.

[0130] The above provides a detailed description of the preferred embodiments of this application. However, this application is not limited to the above-described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of this application. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A control method for a two-stage jet enthalpy-enhancing heat pump system, characterized in that, The two-stage jet enthalpy-increasing heat pump system includes a jet enthalpy compressor, a primary heat exchanger, a secondary heat exchanger, a first throttling assembly for controlling the jet enthalpy circuit of the primary heat exchanger, and a second throttling assembly for controlling the suction circuit of the secondary heat exchanger. The method includes: In the fanless cooling mode, count the number of times the anti-freeze protection is applied. The switching states of the first throttling component and the second throttling component are controlled according to the number of anti-freeze protection cycles. The step of controlling the switching states of the first throttling component and the second throttling component according to the number of anti-freeze protection cycles includes: When both the first throttling component and the second throttling component are in the on state, the switching state of the first throttling component and the second throttling component is controlled according to the first anti-freeze protection count and the first threshold, wherein the first anti-freeze protection count is the number of anti-freeze protection counts when both the first throttling component and the second throttling component are in the on state; When the first throttling component is in the open state and the second throttling component is in the closed state, the switching state of the first throttling component and the second throttling component is controlled according to the second anti-freeze protection count and the second threshold, wherein the second anti-freeze protection count is the number of anti-freeze protection counts when the first throttling component is in the open state and the second throttling component is in the closed state; The step of controlling the switching states of the first throttling component and the second throttling component based on the first anti-freeze protection count and the first threshold includes: When the number of times the first anti-freeze protection is less than the first threshold, both the first throttling component and the second throttling component are kept in the open state. When the number of times the first anti-freeze protection is greater than or equal to the first threshold, the first throttling component is kept open, and the second throttling component is closed. The step of controlling the switching states of the first throttling component and the second throttling component based on the second anti-freeze protection count and the second threshold includes: When the number of times the second anti-freeze protection is less than the second threshold, the first throttling component is kept open, and the second throttling component is kept closed. When the number of times the second anti-freeze protection is greater than or equal to the second threshold, both the first throttling component and the second throttling component are controlled to be in the off state.

2. The method according to claim 1, characterized in that, include: When both the first throttling component and the second throttling component are in the off state, the frequency of the injection enthalpy compressor is controlled according to the third anti-freeze protection count and the third threshold, wherein the third anti-freeze protection count is the number of anti-freeze protection counts when both the first throttling component and the second throttling component are in the off state.

3. The method according to claim 2, characterized in that, The step of controlling the frequency of the injection enthalpy compressor based on the third anti-freeze protection count and the third threshold includes: If the number of times the third antifreeze protection is less than the third threshold, the frequency of the enthalpy compressor is kept constant. If the number of times the third antifreeze protection is greater than or equal to the third threshold, the real-time operating frequency of the enthalpy injection compressor is obtained, and the enthalpy injection compressor is controlled according to the real-time operating frequency and the minimum operating frequency.

4. The method according to claim 3, characterized in that, The control of the injection enthalpy compressor based on the real-time operating frequency and the minimum operating frequency includes: When the real-time operating frequency is less than or equal to the minimum operating frequency, the enthalpy compressor is controlled to stop. When the real-time operating frequency is greater than the minimum operating frequency, the frequency of the injection enthalpy compressor is reduced based on the first step length.

5. The method according to claim 4, characterized in that, After reducing the frequency of the injection enthalpy compressor based on the first step length, the method further includes: Obtain the fourth number of antifreeze protection cycles after reducing the frequency of the injection enthalpy compressor; The frequency of the injection compressor is controlled based on the fourth anti-freeze protection count and the fourth threshold.

6. The method according to claim 5, characterized in that, The step of controlling the frequency of the injection enthalpy compressor based on the fourth anti-freeze protection count and the fourth threshold includes: If the number of times the fourth antifreeze protection is less than the fourth threshold, the frequency of the enthalpy compressor is kept constant. When the fourth anti-freeze protection count is greater than or equal to the fourth threshold, if the reduced frequency of the enthalpy-injected compressor is less than or equal to the minimum operating frequency, the enthalpy-injected compressor is controlled to stop. If the reduced frequency of the enthalpy-injected compressor is greater than the minimum operating frequency, the frequency of the enthalpy-injected compressor is reduced based on the first step.

7. A controller, characterized in that, include: The system includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the computer program, performs a control method for a two-stage jet enthalpy-enhancing heat pump system as described in any one of claims 1 to 6.

8. A two-stage jet enthalpy-enhancing heat pump system, characterized in that, Includes the controller as described in claim 7.

9. A computer-readable storage medium, characterized in that: The system stores computer-executable instructions for performing a control method for a two-stage jet enthalpy-enhancing heat pump system as described in any one of claims 1 to 6.

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