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

Abstract

The invention provides a control method of a heat pump system, the heat pump system and a storage medium, and the method comprises the steps that a compressor is started, so that the compressor pumps a refrigerant into a target section; the current opening degree of the expansion valve is adjusted to improve the pressure of the target section, and the negative pressure difference of the first storage assembly relative to the target section is formed; an electromagnetic valve is opened, so that the first storage assembly sucks the refrigerant from the target section based on the negative pressure difference; and when the negative pressure difference meets the preset first condition, the electromagnetic valve is closed. Thus, the first storage assembly can store part of the refrigerant, the electromagnetic valve plays a role in isolating the first storage assembly from the circulation loop, the refrigerant storage amount in the circulation loop is reduced, and the bursting risk of the heat pump system can be effectively reduced.

Description

Technical Field

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

[0002] Heat pump systems are driven by electricity to transfer heat from low temperature to high temperature. They are widely used because of their high efficiency and energy saving. However, traditional heat pump systems may face the problem of a sharp increase in internal pressure under certain circumstances, posing a risk of bursting. The current industry mainly attempts to reduce the risk of bursting of this heat pump system by limiting the amount of refrigerant charged, but under extreme ambient temperature conditions, this solution of limiting the amount of refrigerant charged may still fail. In short, there is an urgent need for a method to reduce the risk of bursting of heat pump systems. Summary of the invention

[0003] The present application provides a control method for a heat pump system, a heat pump system and a storage medium. The method can enable a first storage component to store a portion of refrigerant, and the solenoid valve serves to isolate the first storage component from the circulation loop, thereby reducing the amount of refrigerant stored in the circulation loop, and can effectively reduce the risk of explosion of the heat pump system.

[0004] In a first aspect, a control method for a heat pump system is provided, wherein the heat pump system comprises a circulation loop consisting of a first heat exchanger, a compressor, a one-way valve, a second heat exchanger, and an expansion valve connected end to end, a solenoid valve connected to a target segment in the circulation loop, and a first storage component connected to the solenoid valve, wherein both ends of the target segment are the one-way valve and the expansion valve, respectively, and the circulation loop is filled with a refrigerant; the method comprises:

[0005] Starting the compressor so that the compressor pumps the refrigerant into the target section;

[0006] Adjusting the current opening of the expansion valve to increase the pressure of the target section and form a negative pressure difference between the first storage component and the target section;

[0007] opening the solenoid valve to allow the first storage assembly to draw refrigerant from the target segment based on the negative pressure differential;

[0008] When the negative pressure difference meets the preset first condition, the solenoid valve is closed.

[0009] In a second aspect, a heat pump system is provided, the heat pump system comprising a memory, a processor, a circulation loop formed by connecting a first heat exchanger, a compressor, a one-way valve, a second heat exchanger, and an expansion valve end to end, a solenoid valve connected to a target segment in the circulation loop, and a first storage component connected to the solenoid valve, the two ends of the target segment are respectively a one-way valve and an expansion valve, and the circulation loop is filled with refrigerant;

[0010] A memory for storing executable program codes;

[0011] The processor is used to call and run the executable program code from the memory, so that the heat pump system executes any one of the control methods for the heat pump system as described above.

[0012] In a third aspect, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores a computer program code, and when the computer program code is executed, any of the above control methods for a heat pump system is implemented.

[0013] The beneficial effects brought about by the technical solutions provided in some embodiments of the present application include at least: adding a solenoid valve and a first storage component in the heat pump system, wherein the solenoid valve is connected to the target segment in the circulation loop of the heat pump system, and the first storage component is connected to the solenoid valve. When the compressor is started, the current opening of the expansion valve is adjusted to increase the pressure of the target segment, forming a negative pressure difference of the first storage component relative to the target segment. Then, the solenoid valve is opened to allow the first storage component to absorb refrigerant from the target segment. Finally, the solenoid valve is closed to allow the first storage component to store a portion of the refrigerant. The solenoid valve serves to isolate the first storage component from the circulation loop, reducing the amount of refrigerant stored in the circulation loop, and can effectively reduce the risk of bursting of the heat pump system. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0015] Figure 1 is a structural schematic diagram of a heat pump system provided in an embodiment of the present application;

[0016] Figure 2 is a structural schematic diagram of a heat pump system provided in an embodiment of the present application;

[0017] Figure 3 is a structural schematic diagram of a heat pump system provided in an embodiment of the present application;

[0018] Figure 4 It is a flow chart of a control method of a heat pump system provided in an embodiment of the present application;

[0019] Figure 5 This is a schematic diagram of the effect of refrigerant storage provided by an embodiment of the present application;

[0020] Figure 6 This is a schematic diagram of the effect of refrigerant storage provided by an embodiment of the present application;

[0021] Figure 7 It is a schematic diagram of a process for controlling the first storage component to discharge refrigerant provided in an embodiment of the present application;

[0022] Figure 8 is a schematic diagram of a flow chart of controlling the first storage component to discharge lubricating oil provided in an embodiment of the present application;

[0023] Fig. 9 This is a schematic diagram of the effect of conventional storage of lubricating oil provided in an embodiment of the present application;

[0024] Fig.10 This is a schematic diagram of the effect of density reversal of lubricating oil and refrigerant provided in an embodiment of the present application;

[0025] Fig.11 This is a schematic diagram of the effect of a first storage component storing lubricating oil and refrigerant at a high position provided by an embodiment of the present application;

[0026] Fig.12 This is a schematic diagram of the effect of a first storage component discharging lubricating oil provided in an embodiment of the present application;

[0027] Fig.13 It is a structural schematic diagram of a heat pump system provided in an embodiment of the present application.

[0028] Description of Figure Numbers:

[0029] Label name Label name 601 First heat exchanger 607 First storage component 602 compressor 608 refrigerant 603 Check valve 609 Second storage component 604 Second heat exchanger 610 lubricating oil 605 Expansion valve 611 Capillary 606 Solenoid valve 612 Oil return hole DETAILED DESCRIPTION

[0030] In order to make the features and advantages of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0031] When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Instead, they are only examples of devices and methods consistent with some aspects of the present application as detailed in the attached claims.

[0032] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as suggesting or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0033] The following are detailed descriptions respectively. It should be noted that the description order of the following embodiments is not intended to limit the preferred order of the embodiments.

[0034] A heat pump system is a device that uses electric energy to drive a compressor to work, transferring heat from a low-temperature heat source to a high-temperature heat source, thereby achieving a heating or cooling effect. Heat pump systems have significant advantages in energy utilization and energy saving, and are widely used in various temperature regulation occasions.

[0035] Among the various configurations of heat pump systems, one includes a compressor, a non-return valve, an expansion valve, and two heat exchangers, which together form a closed circulation loop. The circulation loop is filled with a specific refrigerant, which plays an important role in heat transfer during the operation of the heat pump system. Please refer to, Figure 1 Schematic diagram of a heat pump system provided in an embodiment of the present application. Figure 1 In the structure of the heat pump system shown, the first heat exchanger 601, the compressor 602, the one-way valve 603, the second heat exchanger 604, and the expansion valve 605 are connected end to end to form a circulation loop, and the circulation loop is filled with refrigerant. Driven by the compressor 602, the circulation direction of the refrigerant is the first heat exchanger 601, the compressor 602, the one-way valve 603, the second heat exchanger 604, and the expansion valve 605, that is, after the refrigerant flows out of the expansion valve 605, it flows into the first heat exchanger 601 again. It can be understood that the first heat exchanger 601 can be an evaporator, and the second heat exchanger 604 can be a condenser or an air cooler.

[0036] There are many types of refrigerants that can be used in heat pump systems. Different types of refrigerants can be selected according to different application requirements and environmental conditions. Among them, carbon dioxide (CO2) is used in some heat pump systems as a natural, environmentally friendly and efficient refrigerant.

[0037] However, CO2 has special thermal properties of low critical temperature and high critical pressure. This means that when the CO2 heat pump system is in a static state, as the ambient temperature rises, the pressure inside the heat pump system will also rise sharply. Especially under extreme environmental conditions, the sudden change in the internal pressure of the heat pump system may cause the CO2 heat pump system to have the risk of bursting, which seriously threatens the safe and stable operation of the system. The current measures commonly taken in the industry are to reduce the risk of bursting of the CO2 heat pump system by accurately calculating the volume of the system and designing a maximum refrigerant filling amount. However, this solution has certain limitations in practical applications. On the one hand, due to the complexity of the internal structure and operating state of the CO2 heat pump system, the refrigerant filling amount is often difficult to accurately control; on the other hand, the environmental adaptability of this solution is poor, especially in the face of sudden extreme environments (such as high temperature weather), the originally designed maximum refrigerant filling amount may fail, thus causing safety accidents.

[0038] In view of the above problems, the embodiment of the present application proposes to add a solenoid valve 6 and a first storage component in the heat pump system, wherein the solenoid valve is connected to the target segment in the circulation loop of the heat pump system, and the first storage component is connected to the solenoid valve. When the compressor is started, the current opening of the expansion valve is adjusted to increase the pressure of the target segment, forming a negative pressure difference of the first storage component relative to the target segment. Then, the solenoid valve is opened to allow the first storage component to absorb refrigerant from the target segment. Finally, the solenoid valve is closed to allow the first storage component to store a portion of the refrigerant. The solenoid valve serves to isolate the first storage component from the circulation loop, reducing the amount of refrigerant stored in the circulation loop, and can effectively reduce the risk of bursting of the heat pump system.

[0039] based on Figure 1 The structure of Figure 2 - Fig.12 , the control method of the heat pump system provided in the embodiment of the present application is introduced in detail.

[0040] See also Figure 2 and Figure 3 , Figure 2 and Figure 3 They are schematic diagrams of the structure of a heat pump system provided in the embodiments of the present application. Figure 2 / Figure 3 As shown, the heat pump system involved in this embodiment includes a circulation loop composed of a first heat exchanger 601, a compressor 602, a one-way valve 603, a second heat exchanger 604, and an expansion valve 603 connected end to end, a solenoid valve 606 connected to a target segment in the circulation loop, and a first storage component 607 connected to the solenoid valve 606, the two ends of the target segment are a one-way valve 603 and an expansion valve 603, and the circulation loop is filled with refrigerant.

[0041] Specifically, the circulation loop in the heat pump system is a closed loop composed of multiple components connected by pipes, which is used to realize the working principle of the heat pump, that is, to transfer heat. The following will describe in detail the composition of this circulation loop, the functions of each component, and the flow of the refrigerant in it.

[0042] Components of the circulation loop:

[0043] First heat exchanger 601: The first heat exchanger 601 generally refers to an evaporator of a heat pump system, and its function is to absorb heat from the environment.

[0044] Compressor 602: Compressor 602 is the core component of the heat pump system. Its function is to compress the low-temperature and low-pressure refrigerant into high-temperature and high-pressure refrigerant, that is, to increase the temperature and pressure of the refrigerant.

[0045] One-way valve 603: One-way valve 603 ensures that the refrigerant can only flow in one direction to prevent backflow.

[0046] Second heat exchanger 604: The second heat exchanger 604 is generally an air cooler (for a CO2 heat pump system) or a condenser, and its function is to release heat to the environment.

[0047] Expansion valve 603: The function of the expansion valve 603 is to reduce the pressure and temperature of the refrigerant.

[0048] The above components are connected end to end through pipelines to form a closed circulation loop. Specifically, the outlet of the first heat exchanger 601 is connected to the inlet of the compressor 602 through a pipeline, the outlet of the compressor 602 is connected to the inlet of the one-way valve 603 through a pipeline, the outlet of the one-way valve 603 is connected to the inlet of the second heat exchanger 604 through a pipeline, the outlet of the second heat exchanger 604 is connected to the inlet of the expansion valve 603 through a pipeline, and finally the outlet of the expansion valve 603 is connected to the inlet of the first heat exchanger 601 through a pipeline to form a closed circulation loop.

[0049] The following are the functions of various components in the circulation loop with respect to the refrigerant: the refrigerant passes through the first heat exchanger 601, and absorbs heat from the environment under the action of the first heat exchanger 601; the refrigerant flows from the first heat exchanger 601 into the compressor 602, and the compressor 602 works on the refrigerant to increase the temperature and pressure of the refrigerant, providing power for heat transfer; the refrigerant flows from the compressor 602 into the one-way valve 603, and then flows out from the one-way valve 603, and the one-way valve 603 ensures that the refrigerant flows in one direction in the circulation loop; the refrigerant flows from the one-way valve 603 into the second heat exchanger 604, and releases heat to the environment under the action of the second heat exchanger 604; the refrigerant flows from the second heat exchanger 604 into the expansion valve 603, and then flows out from the expansion valve 603, and the expansion valve 603 reduces the pressure and temperature of the refrigerant to prepare for the next heat absorption process; the refrigerant flows from the expansion valve 603 into the first heat exchanger 601, and one cycle ends. It is understandable that during operation, the heat pump system controls components such as the compressor 602 and the expansion valve 603 to drive the refrigerant to complete multiple cycles in the circulation loop.

[0050] In view of the problem that the heat pump system may face a sharp increase in internal pressure under certain circumstances, the embodiment of the present application adds a solenoid valve 606 and a first storage component 607 to the heat pump system. Among them, the solenoid valve 606 is connected to the target section in the circulation loop, and the first storage component 607 is connected to the solenoid valve 606. The target section is composed of a one-way valve 603, an expansion valve 603, a pipeline between the one-way valve 603 and the expansion valve 603, and other components (including a second heat exchanger 604 and any components that may be added), that is, the two ends of the target section are the one-way valve 603 and the expansion valve 603 respectively.

[0051] To better illustrate the connection relationship between the solenoid valve 606, the first storage component 607 and the circulation loop, Figure 2 and Figure 3 Two different connection modes of connecting the solenoid valve 606 to the target segment are provided respectively.

[0052] like Figure 2 As shown, one end of the solenoid valve 606 is connected to the connection section between the second heat exchanger 604 and the expansion valve 603, and the other end is connected to the refrigerant inlet and outlet of the first storage component 607. In this connection mode, since the refrigerant entering the first storage component 607 has been dissipated by the second heat exchanger 604 before, the temperature is reduced.

[0053] like Figure 3 As shown, one end of the solenoid valve 606 is connected to the connection section between the one-way valve 603 and the second heat exchanger 604, and the other end is connected to the refrigerant inlet and outlet of the first storage component 607. In this connection mode, since the refrigerant entering the first storage component 607 does not pass through the second heat exchanger 604 for heat dissipation, the temperature is relatively high.

[0054] Based on the above Figure 2 , Figure 3 The following will combine the introduction of the heat pump system Figure 4 A control method for a heat pump system according to an embodiment of the present application is proposed. Figure 4 As shown, the method may include the following steps S101-S104.

[0055] S101, starting the compressor so that the compressor pumps the refrigerant into the target section.

[0056] Specifically, the compressor is first started to start its working process. When the compressor is started, it begins to absorb the refrigerant from the first heat exchanger and compresses the refrigerant into a high-pressure and high-temperature state through an internal compression process. This process consumes energy, usually electrical energy. The compressor converts electrical energy into mechanical energy through the internal motor and compression mechanism to compress the refrigerant.

[0057] As the compressor runs, the compressed high-temperature and high-pressure refrigerant is pumped into the target section. The start-up of the compressor not only provides power for the flow of refrigerant in the circulation loop, but also is the starting point for the entire heat pump system to start working.

[0058] S102, adjusting the current opening of the expansion valve to increase the pressure of the target section, thereby forming a negative pressure difference between the first storage component and the target section.

[0059] Specifically, the pressure of the target section can be increased by reducing or maintaining the current opening of the expansion valve. The current opening of the expansion valve refers to the degree of opening of the expansion valve. In the heat pump system, the expansion valve is used to control the flow of the refrigerant from the high-pressure side to the low-pressure side, thereby adjusting the liquid inlet of the first heat exchanger and the pressure in the system.

[0060] If the current opening of the expansion valve is small enough, maintaining the current opening of the expansion valve can limit the flow of the refrigerant through the expansion valve, thereby achieving the effect of increasing the pressure of the target section.

[0061] If the current opening of the expansion valve is not small enough, reducing the current opening of the expansion valve can limit the flow of the refrigerant through the expansion valve, thereby achieving the effect of increasing the pressure of the target section.

[0062] When the pressure of the target section increases, if the pressure in the first storage assembly is relatively low, a negative pressure difference will be formed between the target section and the first storage assembly. This negative pressure difference is the driving force for the refrigerant to flow from the high-pressure target section to the low-pressure first storage assembly.

[0063] S103, opening the solenoid valve to allow the first storage assembly to absorb refrigerant from the target section based on the negative pressure difference.

[0064] Specifically, when a negative pressure difference is formed, the solenoid valve is opened so that the first storage assembly can absorb refrigerant from the target segment based on the negative pressure difference. The solenoid valve here acts as a control valve, and its opening and closing directly determines whether the refrigerant can flow from the target segment into the first storage assembly.

[0065] When the solenoid valve is opened, since the pressure in the target section is higher than the pressure in the first storage component, the refrigerant will automatically flow from the target section to the first storage component under the action of the negative pressure difference. This process is automatic and does not require additional external force. It is completely dependent on the negative pressure difference adjusted in the previous step.

[0066] S104, when the negative pressure difference meets the preset first condition, close the solenoid valve.

[0067] Specifically, when the negative pressure difference meets the preset first condition, the heat pump system will close the solenoid valve. The preset first condition can be set according to the actual operation and demand of the heat pump system. For example, when the negative pressure difference reaches or exceeds a preset threshold, it can be determined that the negative pressure difference meets the preset first condition.

[0068] The purpose of closing the solenoid valve is to isolate the first storage component from the circulation loop, so that the refrigerant in the target section cannot flow into the first storage component, and the refrigerant in the first storage component cannot flow into the circulation loop. In this way, the first storage component can stably store a portion of the refrigerant, reducing the refrigerant in the circulation loop to maintain a stable pressure in the heat pump system.

[0069] In order to more intuitively understand the judgment logic of the preset first condition, an example is provided below: Assuming that the negative pressure difference is ΔP, the preset first condition can be judged based on a preset negative pressure difference threshold, which is recorded as ΔP_threshold.

[0070] When ΔP≥ΔP_threshold (indicating that the negative pressure difference is greater than or equal to a preset negative pressure difference threshold), it is determined that ΔP meets the preset first condition, and the action of closing the solenoid valve may be further triggered.

[0071] Or, if the absolute value of the negative pressure difference is considered:

[0072] When |ΔP|≥|ΔP_threshold| (indicating that the absolute value of the negative pressure difference is greater than or equal to the absolute value of the preset negative pressure difference threshold), it is determined that ΔP meets the preset first condition, and the action of closing the solenoid valve can be further triggered.

[0073] To further demonstrate the storage effect of the first storage component on the refrigerant, see Figure 5 and Figure 6 , Figure 5 and Figure 6 They are schematic diagrams of the effect of a refrigerant storage provided by an embodiment of the present application. Figure 2 / Figure 3 Based on the structure of the heat pump system shown, Figure 5 / Figure 6 The circulation loop of the heat pump system shown is additionally provided with a second storage component 609, which is mainly used to store the refrigerant in the circulation loop. Preferably, the second storage component 609 is arranged between the first heat exchanger 601 and the compressor 602, that is, the outlet of the first heat exchanger 601 is connected to the inlet of the second storage component 609 through a pipeline, and the outlet of the second storage component 609 is connected to the inlet of the compressor 602 through a pipeline. Before the refrigerant flows from the first heat exchanger 601 to the compressor 602, it will first pass through the second storage component 609.

[0074] The second storage component 609 is used to adjust the flow and pressure of the refrigerant to ensure the stable operation of the heat pump system. At the same time, it can also serve as a buffer zone. When there is a temporary imbalance between the supply and demand of the refrigerant in the heat pump system, the second storage component 609 can be used to adjust it.

[0075] In some possible implementations, the second storage component 609 may be a low-pressure tank. The main functions of the low-pressure tank are as follows:

[0076] Buffer and storage: The low-pressure tank can store a certain amount of refrigerant, so as to provide enough refrigerant to maintain the stable operation of the system when the demand of the heat pump system fluctuates. In some cases, the low-pressure tank can even store the lubricating oil 610 required by the compressor 602.

[0077] Pressure regulation: The low-pressure tank can act as a pressure regulator. When the working state of the compressor 602 changes, it can help stabilize the pressure of the heat pump system and prevent damage to the heat pump system due to pressure fluctuations.

[0078] It can be seen that in Figure 5 / Figure 6 In the heat pump system shown, the second storage component 609 is part of the circulation loop. The refrigerant will inevitably pass through the second storage component 609 when circulating in the circulation loop. A considerable part of the refrigerant storage work is completed by the second storage component 609.

[0079] exist Figure 5 In the heat pump system shown, the second storage component 609 stores more refrigerant, while the first storage component 607 stores less refrigerant. At this time, the heat pump system may be in operation, and a large amount of refrigerant in the second storage component 609 can directly participate in the refrigerant circulation of the circulation loop.

[0080] exist Figure 6 In the heat pump system shown, the second storage component 609 stores less refrigerant, while the first storage component 607 stores more refrigerant. At this time, the heat pump system may be in a static state, and a large amount of refrigerant in the first storage component 607 is isolated from the circulation loop, ensuring that the heat pump system will not burst due to the increase in refrigerant pressure in the circulation loop.

[0081] exist Figure 5 Based on the heat pump system shown in FIG. 1 , executing steps S101-S104 of this embodiment can make the first storage component 607 absorb a large amount of refrigerant in the circulation loop (including the second storage component 609), and reduce the refrigerant in the circulation loop, thereby achieving Figure 6 The refrigerant storage effect of the heat pump system shown.

[0082] In this embodiment, a solenoid valve and a first storage component are additionally provided in the heat pump system, wherein the solenoid valve is connected to the target segment in the circulation loop of the heat pump system, and the first storage component is connected to the solenoid valve. When the compressor is started, the current opening of the expansion valve is adjusted to increase the pressure of the target segment, thereby forming a negative pressure difference of the first storage component relative to the target segment. Then, the solenoid valve is opened to allow the first storage component to absorb refrigerant from the target segment. Finally, the solenoid valve is closed to allow the first storage component to store a portion of the refrigerant. The solenoid valve serves to isolate the first storage component from the circulation loop, thereby reducing the amount of refrigerant stored in the circulation loop, and can effectively reduce the risk of bursting of the heat pump system.

[0083] In one possible implementation, Figure 4 Step S102 of the illustrated embodiment may be further refined and may include the following steps:

[0084] If the current opening of the expansion valve is zero, the current opening of the expansion valve is maintained to increase the pressure of the target section, thereby forming a negative pressure difference between the first storage component and the target section;

[0085] If the current opening of the expansion valve is not adjusted to zero, the current opening of the expansion valve is reduced to increase the pressure of the target section, thereby forming a negative pressure difference of the first storage component relative to the target section.

[0086] Specifically, in a heat pump system, the expansion valve is a critical component, and its opening directly affects the flow of the refrigerant through the expansion valve and the pressure distribution in the circulation loop. In order to form a negative pressure difference between the first storage component and the target section, it is possible to choose to maintain the current opening of the expansion valve or reduce the current opening of the expansion valve.

[0087] If the current opening of the expansion valve is zero, it means that the valve of the expansion valve is completely closed and no refrigerant can pass through. In this case, if the pressure of the target segment needs to be increased, it is only necessary to maintain the current opening of the expansion valve at zero. At this time, if the compressor is in the startup state, the refrigerant pressure in the target segment gradually accumulates and rises; if the compressor 602 is in the shutdown state, the refrigerant in the target segment will be restricted by the one-way valve, the expansion valve, and the solenoid valve and cannot flow out of the target segment. It can be seen that at this time, although the refrigerant pressure in the target segment will not gradually accumulate and rise, it is also maintained at a relatively high pressure state.

[0088] If the current opening of the expansion valve is not zero, it means that the expansion valve is not completely closed, and may be partially open or fully open, so that the refrigerant can pass through the expansion valve. In this case, if you need to increase the pressure of the target segment, you can choose to reduce the current opening of the expansion valve. At this time, if the compressor is in the startup state, the refrigerant flowing out of the target segment through the expansion valve will be reduced due to the reduction of the current opening of the expansion valve, and the refrigerant pressure will gradually accumulate and rise; if the compressor is in the shutdown state, the refrigerant in the target segment cannot flow out of the target segment through the one-way valve and the expansion valve. Since the current opening of the expansion valve is reduced, the refrigerant flowing out of the target segment through the expansion valve will be reduced. It can be seen that although the refrigerant pressure in the target segment will gradually decrease at this time, it can still be maintained at a relatively high pressure state in a short time.

[0089] As the pressure of the target section rises or maintains a high pressure state, a negative pressure difference will be formed between the first storage component and the target section. The negative pressure difference can drive the refrigerant to flow from the high-pressure area to the low-pressure area to achieve heat transfer and balance of the system.

[0090] In this embodiment, reducing the current opening of the expansion valve or maintaining the current opening of the expansion valve at zero opening can form a negative pressure difference between the first storage component and the target section, providing a negative pressure difference as power for the first storage component to absorb refrigerant from the target section.

[0091] In one possible implementation, Figure 4 Step S102 of the illustrated embodiment may be further refined and may include the following steps:

[0092] When the compressor is shut down, the current opening of the expansion valve is adjusted to increase the pressure of the target section, thereby forming a negative pressure difference of the first storage assembly relative to the target section.

[0093] Specifically, this embodiment uses shutting down the compressor as a trigger to adjust the current opening of the expansion valve. The action of shutting down the compressor occurs when Figure 4 Between steps S101 and S102 of the illustrated embodiment. After starting the compressor, the compressor pumps the refrigerant into the target section, gradually increasing the pressure of the target section. Then the compressor is shut down, and the target section is in a high pressure state when the compressor is shut down, at which time the current opening of the expansion valve is maintained at zero or the current opening of the expansion valve is reduced, thereby forming a negative pressure difference between the first storage component and the target section.

[0094] In this embodiment, adjusting the current opening of the expansion valve when shutting down the compressor has at least the following two advantages.

[0095] Avoid excessive pressure in the target section: When the compressor is working, it will continuously compress the refrigerant and push it into the target section, which will cause the pressure in the target section to continue to rise. If the current opening of the expansion valve is adjusted at this time, especially when the opening is reduced or maintained at zero, the pressure in the target section will increase rapidly. After shutting down the compressor, no new compressed refrigerant will enter the target section, so the current opening of the expansion valve can be adjusted more safely and accurately to make the target section reach the desired pressure state, thereby avoiding the problem of excessive pressure in the target section caused by the continuous operation of the compressor during the adjustment of the expansion valve.

[0096] Eliminate the risk of the heat pump system bursting when it is at rest: When the heat pump system enters a rest state, the compressor is also shut down. Using the shutdown of the compressor as a condition to trigger the execution of reducing the current opening of the expansion valve or maintaining the current opening of the expansion valve at zero opening, the first storage component can absorb the refrigerant in the circulation loop when the heat pump system enters a rest state, reduce the amount of refrigerant in the circulation loop, and thus eliminate the risk of the heat pump system bursting when it is at rest.

[0097] Based on the above Figure 4 The embodiment shown in the figure provides a method for controlling the first storage component to discharge the refrigerant. Figure 7, Figure 7 It is a flow chart of controlling the first storage component to discharge refrigerant provided in an embodiment of the present application, which includes the following steps S201-S204.

[0098] S201, starting the compressor so that the compressor pumps the refrigerant into the target section.

[0099] For specific implementation of step S201, please refer to Figure 4 The explanation of step S101 in the illustrated embodiment is not repeated here.

[0100] S202, adjusting the current opening of the expansion valve to reduce the pressure of the target section, thereby forming a positive pressure difference between the first storage component and the target section.

[0101] Specifically, the pressure of the target section can be reduced by increasing or maintaining the current opening of the expansion valve. The current opening of the expansion valve refers to the degree of opening of the expansion valve. In the heat pump system, the expansion valve is a key component that controls the flow of refrigerant from the high-pressure side to the low-pressure side, and its opening size directly affects the flow of the refrigerant and the pressure distribution in the system.

[0102] If the current target section pressure is too high, it is necessary to increase the current opening of the expansion valve to allow more refrigerant to flow through, thereby reducing the accumulation of refrigerant in the target section and thus reducing the pressure of the target section. In addition, in some possible cases, if the current opening of the expansion valve is large enough, maintaining the current opening of the expansion valve can also achieve the effect of reducing the pressure of the target section.

[0103] When the pressure of the target section decreases, if the pressure in the first storage assembly is relatively high, a positive pressure difference will be formed between the target section and the first storage assembly. This positive pressure difference is the driving force for the refrigerant to flow from the high-pressure first storage assembly to the low-pressure target section.

[0104] S203, opening the solenoid valve to allow the first storage assembly to discharge refrigerant to the target section based on the positive pressure difference.

[0105] Specifically, when the positive pressure difference is formed, the solenoid valve is opened so that the first storage assembly can discharge the refrigerant into the target section based on the positive pressure difference. The solenoid valve here acts as a control valve, and its opening and closing directly determines whether the refrigerant can flow from the first storage assembly into the target section.

[0106] When the solenoid valve is opened, since the pressure of the first storage component is higher than the pressure in the target segment, the refrigerant will automatically flow from the first storage component to the target segment under the action of the positive pressure difference. This process is automatic and does not require additional external force. It is completely dependent on the positive pressure difference adjusted in the previous steps.

[0107] S204, when the positive pressure difference meets the preset second condition, close the solenoid valve.

[0108] Specifically, when the positive pressure difference meets the preset second condition, the heat pump system will close the solenoid valve. This preset second condition is also set based on the actual operation requirements and performance requirements of the heat pump system. For example, when the positive pressure difference reaches or exceeds a certain preset threshold, it can be considered that the positive pressure difference meets the preset second condition.

[0109] After closing the solenoid valve, the first storage component will be relatively isolated from the circulation loop, which means that the refrigerant in the first storage component cannot continue to flow into the target segment, and the refrigerant in the target segment cannot flow back to the first storage component. The purpose of this is to allow the refrigerant originally stored in the first storage component to return to the circulation loop, and the solenoid valve will prevent the refrigerant in the circulation loop from flowing back to the first storage component.

[0110] In order to more intuitively understand the judgment logic of the preset second condition, an example is provided below: Assuming the positive pressure difference is ΔP', the preset second condition can be judged according to a preset positive pressure difference threshold value, which is recorded as ΔP'_threshold.

[0111] When ΔP'≥ΔP'_threshold (ie, the positive pressure difference is greater than or equal to the preset positive pressure difference threshold), it is determined that ΔP' satisfies the preset second condition, and the action of closing the solenoid valve may be further triggered.

[0112] Or, if the absolute value of the positive pressure difference is considered:

[0113] When |ΔP'|≥|ΔP'_threshold| (ie, the absolute value of the positive pressure difference is greater than or equal to the absolute value of the preset positive pressure difference threshold), it is determined that ΔP' satisfies the preset second condition, and the action of closing the solenoid valve can be further triggered.

[0114] To further demonstrate the storage effect of the first storage component on the refrigerant, see Figure 5 and Figure 6 .exist Figure 5 In the heat pump system shown, the second storage component 609 stores more refrigerant 608, while the first storage component 607 stores less refrigerant 608. Figure 6 In the heat pump system shown, the second storage component 609 stores less refrigerant 608, while the first storage component 607 stores more refrigerant 608.

[0115] exist Figure 6Based on the heat pump system shown in FIG. 1 , by executing steps S201-S204 of this embodiment, a large amount of refrigerant 608 can be discharged from the first storage component 607 to the circulation loop (including the second storage component 609), so that the refrigerant 608 in the circulation loop is sufficient to achieve Figure 5 The refrigerant 608 storage effect of the heat pump system is shown.

[0116] In this embodiment, when the compressor is started, the current opening of the expansion valve is adjusted to reduce the pressure of the target section, forming a positive pressure difference between the first storage component and the target section. Then, the solenoid valve is opened to discharge the refrigerant from the first storage component to the target section. Finally, the solenoid valve is closed, and the solenoid valve serves to isolate the first storage component from the circulation loop. The refrigerant originally stored in the first storage component returns to the circulation loop, so that there is enough refrigerant in the circulation loop to support the normal operation of the heat pump system.

[0117] Based on the above Figure 4 The embodiment shown in the figure provides a method for controlling the first storage component to discharge lubricating oil. Figure 8 , Figure 8 It is a flow chart of controlling the first storage component to discharge lubricating oil provided in an embodiment of the present application, which includes steps S301-S305.

[0118] S301, starting the compressor so that the compressor pumps the refrigerant into the target section.

[0119] S302, when lubricating oil exists in the first storage assembly, the solenoid valve is opened to equalize the pressure of the first storage assembly and the target section.

[0120] S303, adjusting the current opening of the expansion valve to increase the pressure of the first storage assembly and the target section.

[0121] S304, after the preset time has passed, the current opening of the expansion valve is increased to reduce the pressure of the target section, forming a positive pressure difference between the first storage component and the target section, and the first storage component discharges lubricating oil to the target section based on the positive pressure difference.

[0122] S305, when the lubricating oil is completely discharged from the first storage assembly, the solenoid valve is closed.

[0123] Specifically, in a heat pump system, the compressor is a core component, which requires lubricating oil to ensure the smooth operation of its internal moving parts, reduce wear, and help seal and cool. This lubricating oil is usually injected into the compressor, and when the compressor is running, a portion of the lubricating oil may enter the circulation loop along with the refrigerant. It is understandable that the first storage component will not only absorb the refrigerant of the target segment, but also may absorb the lubricating oil flowing through the target segment. In order to maintain the normal operation of the heat pump system, it is sometimes necessary to discharge the lubricating oil from the first storage component to avoid excessive accumulation of lubricating oil and possible impact on the performance and efficiency of the heat pump system.

[0124] As the beginning of the refrigerant cycle, the compressor is first started, and the refrigerant is pumped into the target section through the compressor. As the compressor continues to work, the pressure in the target section gradually rises, laying the foundation for the next operation.

[0125] Next, the solenoid valve is opened when the lubricating oil is confirmed to be present in the first storage assembly. The purpose of this step is to achieve pressure balance between the first storage assembly and the target segment. Specifically, the opening of the solenoid valve balances the pressure of the first storage assembly and the pressure of the target segment.

[0126] Subsequently, it is necessary to limit the flow of the refrigerant by reducing the current opening of the expansion valve or maintaining the current opening of the expansion valve at zero opening, thereby increasing the pressure of the first storage component and the target segment. Specifically, if the current opening of the expansion valve is small enough, then maintaining the current opening of the expansion valve can limit the flow of the refrigerant through the expansion valve, thereby increasing the pressure of the first storage component and the target segment. If the current opening of the expansion valve is not small enough, then reducing the current opening of the expansion valve can limit the flow of the refrigerant through the expansion valve, thereby increasing the pressure of the first storage component and the target segment.

[0127] The timing can be started while reducing the current opening of the expansion valve or maintaining the current opening of the expansion valve at zero opening. When the timing time reaches the preset time (equivalent to the preset time), the pressure of the first storage component and the target segment reaches a stable state. Next, the current opening of the expansion valve is increased so that the expansion valve allows more refrigerant to flow through, and the refrigerant flow rate in the target segment is increased, thereby reducing the pressure of the target segment. This pressure change causes the first storage component to form a positive pressure difference relative to the target segment, which is the driving force for the discharge of the lubricating oil. Under the action of the positive pressure difference, the lubricating oil in the first storage component will be pushed to the target segment with lower pressure, thereby achieving the discharge of the lubricating oil.

[0128] Usually, the first storage assembly stores both refrigerant and lubricant, the density of refrigerant is low while the density of lubricant is high, and the inlet and outlet of the first storage assembly are located at the bottom. When it is confirmed that the lubricant in the first storage assembly has been completely discharged, closing the solenoid valve in time can prevent the refrigerant in the first storage assembly from continuing to flow out. At the same time, closing the solenoid valve also marks the end of the entire lubricant discharge process, and the heat pump system can return to normal operation.

[0129] To understand more intuitively the above oil regulation process in the circulation loop, please refer to Fig. 9 - Fig.12 .

[0130] like Fig. 9 As shown, Fig. 9 610 is a schematic diagram of the effect of conventional storage of lubricating oil provided by an embodiment of the present application, wherein an oil return hole 612 is provided near the bottom of the second storage component 609. At normal temperature, the density of the refrigerant 608 in the second storage component 609 is less than the density of the lubricating oil 610, and the refrigerant 608 and the lubricating oil 610 are not miscible or have poor miscibility (for example, the refrigerant 608 can be CO2, which is generally not miscible with the lubricating oil 610 commonly used in the CO2 heat pump system). Therefore, the refrigerant 608 and the lubricating oil 610 in the second storage component 609 are clearly stratified, the refrigerant 608 is located in the upper layer, and the lubricating oil 610 is located in the lower layer. The lubricating oil 610 located in the lower layer has sufficient oil volume, and the lubricating oil 610 in the second storage component 609 can be transported to the compressor 602 through the oil return hole 612. In addition, the first storage component 607 also stores refrigerant 608 and a small amount of lubricating oil 610.

[0131] like Fig.10 As shown, Fig.10 Schematic diagram of the effect of density reversal of lubricating oil and refrigerant provided in an embodiment of the present application. Fig. 9 The second storage component 609 shown is different. Fig.10The density of the lubricating oil 610 and the refrigerant 608 in the second storage assembly 609 shown is reversed, and this density reversal is usually caused by extreme environmental conditions. For example, when the refrigerant 608 in the second storage assembly 609 is CO2, as the pressure increases, the molecular distance of CO2 decreases, thereby increasing the density of CO2; for another example, when the refrigerant 608 in the second storage assembly 609 is CO2, as the temperature decreases, the thermal motion of CO2 molecules slows down, and the average distance between molecules decreases, resulting in an increase in the density of CO2. In the case where the density of the lubricating oil 610 and the refrigerant 608 is reversed, the refrigerant 608 is located in the lower layer, and the lubricating oil 610 is located in the upper layer. The refrigerant 608 located in the lower layer prevents the lubricating oil 610 in the upper layer from being transported to the compressor 602 through the oil return hole 612, which easily causes the compressor 602 to be short of oil, affecting the normal operation of the heat pump system and even causing the risk of failure.

[0132] like Fig.11 As shown, Fig.11 This is a schematic diagram of the effect of high-position storage of lubricating oil and refrigerant in a first storage component provided by an embodiment of the present application. Fig.10 The heat pump system shown is based on the execution Figure 4 In the illustrated embodiment, steps S101-S104 can enable the first storage component 607 to absorb the refrigerant 608 and lubricating oil 610 in the circulation loop to achieve Fig.11 The first storage component 607 shown in the figure stores lubricating oil 610 and refrigerant 608 at a high position. Fig.11 In the embodiment, the first storage assembly 607 stores most of the refrigerant 608 and lubricating oil 610, while the second storage assembly 609 stores only a small portion of the refrigerant 608 and lubricating oil 610. At this time, the small portion of refrigerant 608 in the lower layer of the second storage assembly 609 does not prevent the small portion of lubricating oil 610 in the upper layer from being transported to the compressor 602 through the oil return hole 612, but the lubricating oil 610 in the second storage assembly 609 still faces the problem of insufficient oil.

[0133] like Fig.12 As shown, Fig.12 Schematic diagram of the effect of the first storage component discharging lubricating oil provided in an embodiment of the present application. Fig.11 The heat pump system shown is based on the execution Figure 8 In the illustrated embodiment, steps S301-S305 can cause the first storage component 607 to discharge lubricating oil 610 into the circulation loop, thereby achieving Fig.12 The storage effect of the second storage component 609 is shown. Fig.12In the embodiment, the first storage component 607 stores most of the refrigerant 608, while the second storage component 609 stores a small amount of refrigerant 608 and most of the lubricating oil 610. The small amount of refrigerant 608 in the lower layer does not prevent most of the lubricating oil 610 in the upper layer from being transported to the compressor 602 through the oil return hole 612. At this time, the amount of lubricating oil 610 in the second storage component 609 is sufficient to ensure that the compressor 602 is continuously supplied with lubricating oil 610, thereby ensuring the normal operation of the heat pump system.

[0134] In this embodiment, by controlling the opening of the expansion valve and the opening and closing of the solenoid valve, the pressure difference between the first storage component and the target section is adjusted, thereby effectively discharging the lubricating oil from the first storage component to the circulation loop, and finally ensuring that the compressor is adequately supplied with lubricating oil. This adjustment not only prevents the wear and failure of the compressor due to lack of oil, but also optimizes the overall operation of the heat pump system. Especially under extreme environmental conditions, when the density of the refrigerant and the lubricating oil reverses, the scheme can be adjusted quickly to maintain the normal operation of the heat pump system. In addition, the scheme also improves the adaptability of the heat pump system to various environmental conditions, extends the service life of the system, and reduces maintenance costs.

[0135] Based on the above Figure 1 The structure of Fig.13 The heat pump system provided in the embodiment of the present application is introduced in detail. Fig.13 , Fig.13 is a schematic diagram of the structure of a heat pump system provided in an embodiment of the present application. It should be noted that: Fig.13 The heat pump system in the present invention is used to implement the present application Figure 2 - Fig.12 For the convenience of explanation, only the part related to the embodiment of the present application is shown. For the specific technical details not disclosed, please refer to the present application. Figure 2 - Fig.12 Specifically, the heat pump system may include a memory, a processor, a circulation loop formed by connecting a first heat exchanger, a compressor, a one-way valve, a second heat exchanger, and an expansion valve end to end, a solenoid valve connected to a target segment in the circulation loop, and a first storage component connected to the solenoid valve, the two ends of the target segment are a one-way valve and an expansion valve, and the circulation loop is filled with refrigerant.

[0136] The processor is the control center of the heat pump system. It uses various interfaces and lines to connect the various parts of the entire heat pump system. It executes various functions of the heat pump system and processes data by running or calling computer program codes stored in the memory, and calling data stored in the memory, thereby monitoring the heat pump system as a whole.

[0137] The memory can be used to store software programs and modules. The processor executes various functional applications and controls the heat pump system by running the computer program codes and modules stored in the memory. The memory can mainly include a program storage area and a data storage area. The program storage area can store an operating system, a computer program code required for at least one function, etc.; the data storage area can store data created according to the use of the heat pump system, etc.

[0138] In addition, the memory may include a high-speed random access memory and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other volatile solid-state storage device. Accordingly, the memory may also include a memory controller to provide the processor with access to the memory.

[0139] In this embodiment, the processor in the heat pump system loads instructions corresponding to one or more computer program code processes into the memory according to the following steps, and the processor runs the computer program code stored in the memory to implement various functions, as follows:

[0140] Starting the compressor so that the compressor pumps the refrigerant into the target section;

[0141] Adjusting the current opening of the expansion valve to increase the pressure of the target section and form a negative pressure difference between the first storage component and the target section;

[0142] opening the solenoid valve to allow the first storage assembly to draw refrigerant from the target segment based on the negative pressure differential;

[0143] When the negative pressure difference meets the preset first condition, the solenoid valve is closed.

[0144] Optionally, when the processor is executing the adjustment of the current opening of the expansion valve to increase the pressure of the target section and form a negative pressure difference between the first storage component and the target section, it specifically executes: if the current opening of the expansion valve is zero, the current opening of the expansion valve is maintained to increase the pressure of the target section and form a negative pressure difference between the first storage component and the target section; if the current opening of the expansion valve is not adjusted to zero, the current opening of the expansion valve is reduced to increase the pressure of the target section and form a negative pressure difference between the first storage component and the target section.

[0145] Optionally, when the processor is executing the adjustment of the current opening of the expansion valve to increase the pressure of the target section and form a negative pressure difference between the first storage component and the target section, it specifically executes: when the compressor is shut down, the current opening of the expansion valve is adjusted to increase the pressure of the target section and form a negative pressure difference between the first storage component and the target section.

[0146] Optionally, after starting the compressor so that the compressor pumps the refrigerant into the target segment, the processor may also execute: adjusting the current opening of the expansion valve to reduce the pressure of the target segment to form a positive pressure difference between the first storage component and the target segment; opening the solenoid valve to enable the first storage component to discharge the refrigerant to the target segment based on the positive pressure difference; and closing the solenoid valve when the positive pressure difference meets a preset second condition.

[0147] Optionally, after starting the compressor so that the compressor pumps the refrigerant into the target segment, the processor may also execute: when there is lubricating oil in the first storage component, opening the solenoid valve to equalize the pressure of the first storage component and the target segment; adjusting the current opening of the expansion valve to increase the pressure of the first storage component and the target segment; after a preset time has passed, increasing the current opening of the expansion valve to reduce the pressure of the target segment to form a positive pressure difference between the first storage component and the target segment, and the first storage component discharges the lubricating oil to the target segment based on the positive pressure difference; when the lubricating oil is completely discharged from the first storage component, closing the solenoid valve.

[0148] In some possible implementations, Fig.13 The heat pump system shown further includes a second storage component in the circulation loop, the first heat exchanger and the compressor are connected via the second storage component, and the second storage component is provided with an oil return hole for delivering lubricating oil in the second storage component to the compressor.

[0149] Specifically, the oil return hole is arranged in the connecting pipeline between the compressor and the second storage assembly, and is located near the bottom of the second storage assembly. Fig. 9 - Fig.12 The connection mode of the second storage component 609 in the circulation loop and the setting position of the oil return hole 612 in the second storage component 609 are provided in an exemplary manner. It should be noted that the second storage component 609 is generally a low-pressure tank. The second storage component 609 can be used to store and regulate the refrigerant and lubricating oil 610 in the circulation loop; the oil return hole 612 can be used to return the oil of the compressor 602 to ensure the normal operation of the compressor 602.

[0150] In some possible implementations, Fig.13 The solenoid valve in the heat pump system shown is connected to the connecting section between the second heat exchanger and the expansion valve.

[0151] Specifically, Figure 2 , Figure 5 - Figure 6 , Fig. 9 - Fig.12The connection relationship between the solenoid valve 606 and the circulation loop is provided in an exemplary manner, wherein one end of the solenoid valve 606 is connected to the connection section between the second heat exchanger 604 and the expansion valve 603, and the other end is connected to the refrigerant inlet and outlet of the first storage component 607. In this connection mode, since the refrigerant entering the first storage component 607 has been dissipated by the second heat exchanger 604 before, the temperature is reduced. In this way, the requirements for the structural rigidity and high temperature resistance of the first storage component 607 are also reduced, and the cost of the first storage component 607 can be reduced.

[0152] In some possible implementations, Fig.13 The heat pump system shown further comprises a capillary tube, one end of which is connected to the connecting section between the compressor and the one-way valve, and the other end of which is connected to the connecting section between the expansion valve and the first heat exchanger.

[0153] Specifically, Figure 5 - Figure 6 , Fig. 9 - Fig.12 The connection relationship between the capillary tube 611 and the circulation loop is provided in an exemplary manner. The refrigerant flowing out of the compressor 602 enters the capillary tube 611, then flows out through the capillary tube 611 to the connection section between the expansion valve 603 and the first heat exchanger 601, and finally enters the first heat exchanger 601, which can play a certain role in flow regulation and temperature regulation of the first heat exchanger 601.

[0154] In this embodiment, a solenoid valve and a first storage component are additionally provided in the heat pump system, wherein the solenoid valve is connected to the target segment in the circulation loop of the heat pump system, and the first storage component is connected to the solenoid valve. When the compressor is started, the current opening of the expansion valve is adjusted to increase the pressure of the target segment, thereby forming a negative pressure difference of the first storage component relative to the target segment. Then, the solenoid valve is opened to allow the first storage component to absorb refrigerant from the target segment. Finally, the solenoid valve is closed to allow the first storage component to store a portion of the refrigerant. The solenoid valve serves to isolate the first storage component from the circulation loop, thereby reducing the amount of refrigerant stored in the circulation loop, and can effectively reduce the risk of bursting of the heat pump system.

[0155] This embodiment also provides a computer-readable storage medium, in which a computer program code is stored. When the computer program code is executed on a computer, the computer executes the above-mentioned related method steps to implement a control method for a heat pump system provided in the above embodiment.

[0156] The storage medium may include: a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, etc.

[0157] Since the instructions stored in the storage medium can execute the steps in any one of the control methods for the heat pump system provided in the embodiments of the present application, the beneficial effects that can be achieved by any one of the control methods for the heat pump system provided in the embodiments of the present application can be achieved. For details, please refer to the previous embodiments and will not be repeated here.

[0158] The control method of the heat pump system, the heat pump system and the storage medium provided in the embodiments of the present application are introduced in detail above. The principles and implementation methods of the present application are described in detail using specific examples herein. The above embodiments are only used to help understand the method and core idea of ​​the present application. At the same time, for those skilled in the art, according to the idea of ​​the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present application.

Claims

1. A control method for a heat pump system, It is characterized in that The heat pump system comprises a circulation loop formed by connecting a first heat exchanger, a compressor, a one-way valve, a second heat exchanger, and an expansion valve end to end, a solenoid valve connected to a target segment in the circulation loop, and a first storage component connected to the solenoid valve, the two ends of the target segment are the one-way valve and the expansion valve respectively, and the circulation loop is filled with refrigerant; the method comprises: Starting the compressor so that the compressor pumps the refrigerant into the target section; adjusting the current opening of the expansion valve to increase the pressure of the target section and form a negative pressure difference between the first storage component and the target section; opening the solenoid valve to allow the first storage assembly to draw the refrigerant from the target section based on the negative pressure difference; When the negative pressure difference meets a preset first condition, the solenoid valve is closed.

2. The control method of the heat pump system according to claim 1, It is characterized in that The step of adjusting the current opening of the expansion valve to increase the pressure of the target section and form a negative pressure difference between the first storage component and the target section includes: If the current opening of the expansion valve is zero, maintaining the current opening of the expansion valve to increase the pressure of the target section, thereby forming a negative pressure difference between the first storage component and the target section; If the current opening of the expansion valve is not adjusted to zero, the current opening of the expansion valve is reduced to increase the pressure of the target section, thereby forming a negative pressure difference of the first storage component relative to the target section.

3. The control method of the heat pump system according to claim 1, It is characterized in that The step of adjusting the current opening of the expansion valve to increase the pressure of the target section and form a negative pressure difference between the first storage component and the target section includes: When the compressor is shut down, the current opening of the expansion valve is adjusted to increase the pressure of the target section, thereby forming a negative pressure difference between the first storage component and the target section.

4. The control method of the heat pump system according to claim 1, It is characterized in that After starting the compressor so that the compressor pumps the refrigerant into the target section, the method further includes: adjusting the current opening of the expansion valve to reduce the pressure of the target section and form a positive pressure difference between the first storage component and the target section; opening the solenoid valve to cause the first storage assembly to discharge the refrigerant toward the target section based on the positive pressure differential; When the positive pressure difference meets a preset second condition, the solenoid valve is closed.

5. The control method of the heat pump system according to claim 1, It is characterized in that After starting the compressor so that the compressor pumps the refrigerant into the target section, the method further includes: When lubricating oil is present in the first storage assembly, opening the solenoid valve to equalize the pressure of the first storage assembly and the target section; adjusting the current opening of the expansion valve to increase the pressure of the first storage assembly and the target section; After a preset time has passed, the current opening of the expansion valve is increased to reduce the pressure of the target section, thereby forming a positive pressure difference between the first storage component and the target section, and the first storage component discharges the lubricating oil to the target section based on the positive pressure difference; When the first storage assembly is completely drained of the lubricating oil, the solenoid valve is closed.

6. A heat pump system, It is characterized in that The heat pump system includes a memory, a processor, a circulation loop formed by connecting a first heat exchanger, a compressor, a one-way valve, a second heat exchanger, and an expansion valve end to end, a solenoid valve connected to a target segment in the circulation loop, and a first storage component connected to the solenoid valve, the two ends of the target segment are the one-way valve and the expansion valve respectively, and the circulation loop is filled with refrigerant; The memory is used to store executable program code; The processor is used to call and run the executable program code from the memory, so that the heat pump system executes the method according to any one of claims 1 to 5.

7. The heat pump system according to claim 6, It is characterized in that The heat pump system also includes a second storage component in the circulation loop, the first heat exchanger and the compressor are connected via the second storage component, and the second storage component is provided with an oil return hole, which is used to transport the lubricating oil in the second storage component to the compressor.

8. The heat pump system according to claim 6, It is characterized in that The solenoid valve is connected to a connecting section between the second heat exchanger and the expansion valve.

9. The heat pump system according to claim 6, It is characterized in that The heat pump system further comprises a capillary tube, one end of which is connected to a connecting section between the compressor and the one-way valve, and the other end of which is connected to a connecting section between the expansion valve and the first heat exchanger.

10. A computer-readable storage medium, It is characterized in that The computer-readable storage medium stores a computer program code, and when the computer program code is executed, the method according to any one of claims 1 to 5 is implemented.

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