Refrigerant circulation system for air suspension compressor and control method and device thereof

Abstract

The application provides a refrigerant circulation system for an aerostatic compressor and a control method and device thereof. The system comprises a main refrigerant circuit provided with an aerostatic compressor, a condenser, an evaporator and an electronic expansion valve connected in sequence, a first inlet provided on an aerostatic bearing of the aerostatic compressor and a first outlet provided on a body of the aerostatic compressor, the first inlet and the first outlet both being communicated to a cavity in the body; a liquid supply pipeline and a liquid discharge pipeline, an outlet of the condenser being communicated to the first inlet through the liquid supply pipeline, the first outlet being communicated to the evaporator through the liquid discharge pipeline; a pump body provided on the liquid supply pipeline, and an exhaust pipeline communicated to the evaporator further provided on the liquid supply pipeline, and an exhaust valve provided on the exhaust pipeline. Through accurate control and exhaust mechanism, on the one hand, the refrigerant is ensured to circulate in the system in an optimal state, and on the other hand, the stable operation of the pump body is ensured and the working efficiency thereof is improved, thereby realizing high-efficiency refrigeration effect.

Description

Technical Field

[0001] This invention relates to the field of electrical technology, and in particular to a refrigerant circulation system for an air-suspension compressor and its control method and apparatus. Background Technology

[0002] The principle of a static pressure air suspension bearing is as follows: liquid refrigerant is supplied to the porous static pressure air suspension bearing, discharged from the bearing and collected in the motor cavity, then returned to the evaporator along with the refrigerant used to cool the motor. The pressure difference between the refrigerant entering and exiting the bearing generates buoyancy, providing stable suspension for the compressor rotor. The liquid refrigerant entering the bearing also serves as a liquid level lubricant, and its partial vaporization temperature reduction helps cool the bearing. The suspension pressure difference ΔP = P1 (supply tank pressure) - P2 (machine cavity pressure), which can range from 450 kPa to 650 kPa. If high-pressure refrigerant gas is supplied to the bearing, the gas will condense due to temperature differences among the compressor components, causing it to lose pressure. Therefore, liquid supply is a reliable solution for static pressure air suspension bearings.

[0003] To ensure a stable refrigerant liquid suspension pressure differential within the normal range, some current solutions involve pumping refrigerant into a supply tank via a gear pump. The supply tank is electrically heated to increase the refrigerant pressure for supply. The liquid level in the supply tank is maintained by the gear pump. When the liquid level in the supply tank falls below the lower limit, the gear pump is activated to replenish refrigerant; when the refrigerant level reaches the upper limit, the gear pump is deactivated.

[0004] This solution has a technical problem: if the insulation is inadequate, the filter resistance is high, or the refrigerant temperature is much lower than the outside temperature, there may be gaseous refrigerant in front of the gear pump. Gaseous refrigerant will seriously affect the pumping efficiency of the gear pump, causing the gear pump to malfunction, run dry, etc., which will damage the gear pump and prevent the system from working properly. Summary of the Invention

[0005] This invention provides a refrigerant circulation system for an air-suspended compressor, as well as its control method and apparatus, to overcome the deficiencies in the prior art and achieve the following technical effects: through precise control and exhaust mechanisms, on the one hand, it ensures that the refrigerant circulates in the system in the best state, and on the other hand, it ensures the stable operation of the pump and improves its working efficiency, thereby achieving a highly efficient cooling effect.

[0006] A refrigerant circulation system for an air-suspension compressor according to a first aspect embodiment of the present invention includes:

[0007] The main refrigerant circuit includes an air-suspended compressor, a condenser, an evaporator, and an electronic expansion valve connected in sequence. The air-suspended compressor has a first inlet on its air-bearing structure and a first outlet on its body. Both the first inlet and the first outlet are connected to the internal cavity of the compressor body.

[0008] The condenser outlet is connected to the first inlet via the liquid supply line, and the first outlet is connected to the evaporator via the liquid drain line.

[0009] The liquid supply pipeline is equipped with a pump body, and the liquid supply pipeline is also equipped with an exhaust pipeline connected to the evaporator, and the exhaust pipeline is equipped with an exhaust valve.

[0010] According to one embodiment of the present invention, a liquid supply tank is provided on the liquid supply pipeline;

[0011] The liquid supply tank is provided with a second liquid inlet, a second liquid outlet and an exhaust port. The second liquid inlet is connected to the pump body, the second liquid outlet is connected to the first inlet, and the exhaust port is connected to the evaporator.

[0012] According to one embodiment of the present invention, the liquid supply pipeline is further provided with a solenoid valve and a check valve, the two ends of the check valve being connected to the second liquid inlet and the outlet of the solenoid valve respectively, and the two ends of the solenoid valve being connected to the inlet of the check valve and the outlet of the pump body respectively.

[0013] The inlet of the exhaust pipe is located between the solenoid valve and the pump body.

[0014] According to one embodiment of the present invention, a liquid level sensor is provided inside the liquid supply tank;

[0015] The refrigerant circulation system also includes a controller, which is connected to the pump body, the exhaust valve, the solenoid valve and the liquid level sensor respectively. The controller is used to receive the liquid level information from the liquid level sensor and control the opening and closing of the pump body and the solenoid valve and the opening degree of the exhaust valve according to the liquid level information.

[0016] A control method for a refrigerant circulation system of an air-suspended compressor based on a first aspect embodiment of the present invention, according to a second aspect embodiment of the present invention, includes:

[0017] Obtain the refrigerant information in the supply pipeline;

[0018] Based on the refrigerant supply information, control and adjust the switch of the pump body and / or the opening of the exhaust valve.

[0019] According to one embodiment of the present invention, the refrigerant supply information includes information about the gaseous refrigerant in the refrigerant supply pipeline;

[0020] The step of controlling and adjusting the switch of the pump body and / or the opening degree of the exhaust valve based on the refrigerant supply information specifically includes:

[0021] If the gaseous refrigerant in the supply pipeline meets the venting conditions, then the venting valve is opened.

[0022] If the gaseous refrigerant in the supply pipeline does not meet the venting conditions, the venting valve is closed, and the pump body is switched on and off according to the actual liquid level in the supply tank.

[0023] According to an embodiment of the present invention, the step of obtaining the refrigerant information in the refrigerant supply pipeline specifically includes:

[0024] If the pump body is determined to be currently in a closed state, then the actual liquid level of the supply tank is obtained;

[0025] If the difference between the actual liquid level and the preset minimum liquid level is greater than zero and less than the preset liquid level difference, it is determined that the gaseous refrigerant in the liquid supply pipeline meets the exhaust conditions.

[0026] Alternatively, if the difference between the actual liquid level and the preset minimum liquid level is less than or equal to zero, it is determined that the gaseous refrigerant in the liquid supply pipeline does not meet the exhaust conditions.

[0027] According to an embodiment of the present invention, the step of obtaining the refrigerant information in the refrigerant supply pipeline specifically includes:

[0028] If it is determined that the pump body is currently in a closed state, then the duration of the pump body's continuous closure is obtained;

[0029] If the duration of continuous shutdown exceeds the first set duration, it is determined that the gaseous refrigerant in the liquid supply line meets the exhaust conditions.

[0030] Alternatively, if the duration of continuous shutdown is less than the second set duration, it is determined that the gaseous refrigerant in the liquid supply line does not meet the exhaust conditions.

[0031] Wherein, the first set duration is greater than or equal to the second set duration.

[0032] According to one embodiment of the present invention, after the step of controlling the opening of the exhaust valve when the gaseous refrigerant in the liquid supply pipeline meets the exhaust conditions, the method further includes:

[0033] The initial opening degree and / or continuous opening duration of the exhaust valve are controlled and adjusted according to the continuous closed duration of the pump body.

[0034] According to an embodiment of the present invention, the step of controlling and adjusting the initial opening degree and / or the continuous opening duration of the exhaust valve based on the continuous closed duration of the pump body specifically includes:

[0035] When the duration of continuous closure is within the first duration range, the initial opening degree of the exhaust valve is controlled to be the first opening degree;

[0036] When the duration of continuous closure is within the second duration range, the initial opening degree of the exhaust valve is controlled to be the second opening degree;

[0037] When the duration of continuous closure is within the third duration range, the initial opening degree of the exhaust valve is controlled to be the maximum opening degree;

[0038] Wherein, the first duration range is less than the second duration range, the second duration range is less than the third duration range, and the first opening degree is less than the second opening degree, and the second opening degree is less than the maximum opening degree.

[0039] According to one embodiment of the present invention, in the step of controlling and adjusting the initial opening degree and / or continuous opening duration of the exhaust valve based on the continuous closing duration of the pump body, the continuous opening duration is obtained in the following way:

[0040] Establish the calculation formula for the continuous off duration and the continuous on duration;

[0041] Substitute the current continuous shutdown duration of the pump body into the calculation formula to obtain the required continuous on duration of the pump body;

[0042] The duration of continuous on is positively correlated with the duration of continuous off.

[0043] A control device for a refrigerant circulation system of an air-suspended compressor based on a first aspect embodiment of the present invention, according to a third aspect embodiment of the present invention, includes:

[0044] The acquisition module is used to acquire information about the refrigerant supply in the liquid supply pipeline;

[0045] The control module is used to control and adjust the switching of the pump body and / or the opening degree of the exhaust valve based on the liquid refrigerant information.

[0046] In summary, the refrigerant circulation system for the air-suspension compressor according to the present invention aims to improve the efficiency and reliability of the air-suspension compressor. Through precise control and exhaust mechanisms, on the one hand, it ensures that the refrigerant circulates in the system in the best condition, and on the other hand, it ensures the stable operation of the pump body and improves its working efficiency, thereby achieving a highly efficient cooling effect.

[0047] It should be emphasized that the refrigerant circulation system of the present invention, by incorporating an exhaust pipe and exhaust valve, can achieve the following beneficial effects: (1) Preventing cavitation and dry running: The design of the exhaust valve and exhaust pipe can effectively remove gaseous refrigerant from the liquid supply pipe, preventing gaseous refrigerant from entering the pump body and bearings, thereby avoiding cavitation and dry running, and thus protecting the pump body and bearings and extending the equipment life. (2) Improving pump efficiency: By timely removing gaseous refrigerant, it is ensured that the pump body sucks in liquid refrigerant, which can improve the working efficiency of the pump body and avoid the decrease in pump body efficiency caused by gaseous refrigerant. (3) System stability: The control logic of the exhaust valve can be automatically adjusted according to the actual operating status of the system (such as the liquid level of the liquid supply tank, the operating status of the pump body, etc.), ensuring that the system can operate stably under various working conditions. (4) Simplifying maintenance: Since the potential damage of gaseous refrigerant to the pump body and bearings is reduced, the maintenance work of the system becomes simpler, reducing maintenance costs and time. (5) Improved system reliability: The presence of exhaust valves and exhaust pipes improves the reliability of the entire refrigerant circulation system and reduces system failures and downtime caused by the accumulation of gaseous refrigerant. (6) Enhanced adaptability: Under different ambient temperatures and operating pressures, exhaust valves and exhaust pipes can adaptively remove excess gas, ensuring that the system can operate efficiently under various conditions. Attached Figure Description

[0048] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0049] Figure 1 This is a schematic diagram of a refrigerant circulation system for an air-suspension compressor provided in an embodiment of the present invention;

[0050] Figure 2 This is a schematic diagram of a refrigerant circulation system for an air-suspension compressor provided in another embodiment of the present invention;

[0051] Figure 3 This is a schematic diagram of a refrigerant circulation system for an air-suspension compressor provided in another embodiment of the present invention;

[0052] Figure 4 This is a schematic diagram of the steps of the control method for the refrigerant circulation system of an air-suspended compressor provided by the present invention;

[0053] Figure 5 This is a schematic diagram of the structure of the control device for the refrigerant circulation system of the air-suspended compressor provided by the present invention;

[0054] Figure 6 This is a schematic diagram of the structure of the electronic device provided by the present invention.

[0055] Figure label:

[0056] 1. Main refrigerant circuit; 2. Air-suspension compressor; 21. First inlet; 22. First outlet; 3. Condenser; 4. Evaporator; 5. Electronic expansion valve;

[0057] 6. Liquid supply line; 61. Pump body; 62. Liquid supply tank; 63. Solenoid valve; 64. Check valve; 7. Drain line; 81. Exhaust line; 82. Exhaust valve; 83. Liquid replenishment line; 84. Liquid replenishment valve; 85. Bypass line; 86. Bypass expansion valve; 87. Machine cooling line; 88. Cooling expansion valve; 91. Economizer; 92. Flash evaporator; 110. Acquisition module; 120. Control module. Detailed Implementation

[0058] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0059] In the description of the embodiments of this invention, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0060] The following description, with reference to the accompanying drawings, illustrates a refrigerant circulation system for an air-suspended compressor 2, as well as its control method and device. It should be noted that the control method and device proposed in this invention are based on the refrigerant circulation system for the air-suspended compressor 2 of this invention.

[0061] Before introducing the refrigerant circulation system for the air-suspension compressor 2 according to the first aspect embodiment of the present invention, the air-suspension compressor 2 is first explained: the air-suspension compressor 2 is a high-efficiency refrigeration device that utilizes air suspension technology to support and drive the rotor of the air-suspension compressor 2. Compared with the conventional air-suspension compressor 2, the air-suspension compressor 2 has higher energy efficiency and lower operating noise.

[0062] The following is the working principle of the air-suspension compressor 2: The core of the air-suspension compressor 2 is the air-suspension bearing, which uses high-pressure gas (usually refrigerant) to support the rotor, suspending it within the bearing, thus eliminating the physical contact found in traditional bearings. When the air-suspension compressor 2 starts, high-pressure gas enters the bearing through micropores, forming an air film. This air film supports the rotor, suspending it in the air. Because there is no direct contact between the rotor and the bearing, friction and wear are greatly reduced, which not only improves the operating efficiency of the air-suspension compressor 2 but also extends the service life of the equipment.

[0063] like Figures 1 to 3 As shown, the refrigerant circulation system for the air-suspended compressor 2 according to an embodiment of the present invention includes a main refrigerant circuit 1, a liquid supply line 6, a liquid discharge line 7, a pump body 61, an exhaust line 81, and an exhaust valve 82.

[0064] The main refrigerant circuit 1 includes an air-suspended compressor 2, a condenser 3, an evaporator 4, and an electronic expansion valve 5 connected in sequence. The air-suspended compressor 2 has a first inlet 21 on its air-bearing structure and a first outlet 22 on its casing. Both the first inlet 21 and the first outlet 22 are connected to the internal cavity of the compressor. It can be understood that the first inlet 21 is used to supply refrigerant liquid to the bearing to maintain the suspension and lubrication of the rotor of the air-suspended compressor 2. The first outlet 22 is used to discharge the refrigerant liquid, which then enters the evaporator 4.

[0065] The outlet of condenser 3 is connected to the first inlet 21 via liquid supply line 6, and the first outlet 22 is connected to the inlet of evaporator 4 via liquid drain line 7.

[0066] A pump body 61 is installed on the liquid supply line 6. The pump body 61 is used to push the liquid refrigerant from the condenser 3 to the liquid inlet of the air suspension compressor 2. The liquid supply line 6 is also provided with an exhaust line 81 connected to the inlet of the evaporator 4. The exhaust line 81 is equipped with an exhaust valve 82. The exhaust line is used to discharge any gases that may be present in the system, and the exhaust valve 82 is used to control the discharge of gases, ensuring that the refrigerant in the system circulates in a liquid state and preventing gaseous refrigerant from affecting the system efficiency.

[0067] The refrigerant circulation system for the air-suspension compressor 2 according to an embodiment of the present invention has the following specific working principle and working process:

[0068] When the system starts, the refrigerant absorbs heat and evaporates into a gaseous state in the evaporator 4. The gaseous refrigerant is then drawn into the air-suspension compressor 2. Inside the air-suspension compressor 2, the gaseous refrigerant is compressed, its pressure and temperature rise, and it is then transported to the condenser 3. In the condenser 3, the high-temperature, high-pressure gaseous refrigerant releases heat to the surrounding environment, thereby condensing into a liquid state.

[0069] The liquid refrigerant flowing out of the condenser 3 is divided into two parts. One part flows into the evaporator 4 through the main refrigerant circuit 1 and returns to the suction port of the air-suspended compressor 2. The other part flows through the liquid supply line 6 to the first inlet 21 of the air-suspended compressor 2. At this point, this part of the liquid refrigerant directly enters the air-bearing structure of the air-suspended compressor 2, providing suspension and lubrication for the rotor of the air-suspended compressor 2. Simultaneously, the refrigerant partially vaporizes in the bearing, helping to lower the bearing temperature and ensure its normal operation. After passing through the air-bearing structure, part of the refrigerant is discharged through the first outlet 22, enters the drain line 7, and finally returns to the evaporator 4. In the evaporator 4, the refrigerant absorbs heat and evaporates again, completing the cycle.

[0070] It is understandable that if gaseous refrigerant is present in the liquid supply line 6 during the entire cycle, it may affect the working efficiency of the pump body 61 and even cause damage. Therefore, to solve this problem, the liquid supply line 6 is equipped with an exhaust line 81 and an exhaust valve 82. When the system detects the presence of gaseous refrigerant in the liquid supply line 6, the exhaust valve 82 will open, allowing the gaseous refrigerant to be discharged to the evaporator 4 through the exhaust line 81, thereby ensuring that the pump body 61 can efficiently deliver liquid refrigerant.

[0071] Furthermore, during actual operation, the system can monitor the pressure, temperature, and liquid level of the liquid supply line 6, as well as the operating status of the air-suspended compressor 2, through sensors. Based on this data, the control system adjusts the operation of the pump body 61 and the opening and closing of the exhaust valve 82 to ensure stable and efficient refrigerant circulation.

[0072] When the system needs to be shut down, the control system will gradually reduce the operating speed of the air-suspended compressor 2 and close the exhaust valve 82 to ensure the safe shutdown of the refrigerant circulation system. During maintenance, the system can use the exhaust pipe 81 and exhaust valve 82 to remove gas from the system for inspection and maintenance.

[0073] In summary, the design of the refrigerant circulation system for the air-suspension compressor 2 according to the present invention aims to improve the efficiency and reliability of the air-suspension compressor 2. Through precise control and exhaust mechanisms, on the one hand, it ensures that the refrigerant circulates in the system in the best state, and on the other hand, it ensures the stable operation of the pump body 61 and improves its working efficiency, thereby achieving a highly efficient cooling effect.

[0074] It should be emphasized that the refrigerant circulation system of the present invention, by incorporating the design of the exhaust pipe 81 and the exhaust valve 82, can achieve the following beneficial effects: (1) Preventing cavitation and dry running: The design of the exhaust valve 82 and the exhaust pipe 81 can effectively remove the gaseous refrigerant in the liquid supply pipe 6, preventing the gaseous refrigerant from entering the pump body 61 and bearings, thereby avoiding cavitation and dry running, and thus protecting the pump body 61 and bearings and extending the equipment life. (2) Improving the efficiency of the pump body 61: By timely removing the gaseous refrigerant, it is ensured that the pump body 61 sucks in liquid refrigerant, which can improve the working efficiency of the pump body 61 and avoid the decrease in pump body 61 efficiency caused by the gaseous refrigerant. (3) System stability: The control logic of the exhaust valve 82 can be automatically adjusted according to the actual operating status of the system (such as the liquid level of the liquid supply tank 62, the operating status of the pump body 61, etc.), ensuring that the system can operate stably under various working conditions. (4) Simplifying maintenance: Since the potential damage of gaseous refrigerant to the pump body 61 and bearings is reduced, the maintenance work of the system becomes simpler, reducing maintenance costs and time. (5) Improved system reliability: The presence of exhaust valve 82 and exhaust pipe 81 improves the reliability of the entire refrigerant circulation system and reduces system failures and downtime caused by the accumulation of gaseous refrigerant. (6) Enhanced adaptability: Under different ambient temperatures and operating pressures, exhaust valve 82 and exhaust pipe 81 can adaptively remove excess gas, ensuring that the system can operate efficiently under various conditions.

[0075] like Figures 1 to 3 As shown, according to some embodiments of the present invention, a liquid supply tank 62 is provided on the liquid supply pipeline 6. The liquid supply tank 62 is provided with a second liquid inlet, a second liquid outlet and an exhaust port. The second liquid inlet is connected to the pump body 61, the second liquid outlet is connected to the first inlet 21 and the exhaust port is connected to the evaporator 4.

[0076] In this embodiment, the liquid supply tank 62 is a closed container used to store liquid refrigerant. It is typically located between the condenser 3 and the air-suspended compressor 2 to stabilize the refrigerant supply. The second inlet is where the liquid supply tank 62 receives liquid refrigerant from the condenser 3; the second outlet allows the refrigerant in the liquid supply tank 62 to flow to the air-suspended compressor 2, providing the necessary liquid refrigerant for the air-bearing mechanism of the air-suspended compressor 2 to achieve rotor suspension and lubrication; the exhaust port is connected to the evaporator 4 to discharge any gaseous refrigerant that may be present in the liquid supply tank 62, maintaining pressure balance inside the liquid supply tank 62 and ensuring that the refrigerant is supplied to the air-suspended compressor 2 in liquid form.

[0077] After condensation in condenser 3, the liquid refrigerant enters the supply tank 62 through the second inlet and is pumped by pump 61. The supply tank 62 stores sufficient liquid refrigerant to ensure a stable supply during the operation of the air-suspension compressor 2. When the air-suspension compressor 2 requires refrigerant, the liquid refrigerant flows through the second outlet to the first inlet 21 of the air-suspension compressor 2 and enters the air-bearing bearing. If there is excess gaseous refrigerant inside the supply tank 62, it will be discharged to the evaporator 4 through the exhaust port to maintain stable pressure inside the supply tank 62.

[0078] In this way, the presence of the liquid supply tank 62 reduces fluctuations in refrigerant supply, ensuring a stable refrigerant supply for the air-suspension compressor 2 under different loads. Furthermore, the liquid supply tank 62 can regulate the refrigerant flow rate, supplying liquid according to the actual needs of the air-suspension compressor 2, thus improving the efficiency of refrigerant circulation. In addition, the centralized liquid supply function of the liquid supply tank 62 simplifies the system's piping design, reduces connection points, and lowers the risk of leakage.

[0079] like Figures 1 to 3 As shown, according to some embodiments of the present invention, the liquid supply pipeline 6 is further provided with a solenoid valve 63 and a one-way valve 64. The two ends of the one-way valve 64 are respectively connected to the second liquid inlet and the outlet of the solenoid valve 63, and the two ends of the solenoid valve 63 are respectively connected to the inlet of the one-way valve 64 and the outlet of the pump body 61. The inlet of the exhaust pipeline 81 is located between the solenoid valve 63 and the pump body 61.

[0080] In this embodiment, when the solenoid valve 63 is open, refrigerant is allowed to flow from the pump body 61 to the supply tank 62; when the solenoid valve 63 is closed, the flow of refrigerant is cut off, thereby controlling the filling speed and pressure of the supply tank 62. In this system, the check valve 64 ensures that the refrigerant can only enter the supply tank 62 from the second inlet and will not flow back from the supply tank 62 to the pump body 61. This design prevents refrigerant backflow when the solenoid valve 63 is closed. The exhaust pipe 81 maintains the purity of the refrigerant in the supply pipe 6, ensuring that the air-suspended compressor 2 receives liquid refrigerant.

[0081] Specifically, when the system starts up or needs refrigerant replenishment, solenoid valve 63 opens, allowing refrigerant to flow from pump body 61 to supply tank 62 via solenoid valve 63. One-way valve 64 ensures that the refrigerant can only flow in one direction. During the filling process, if gaseous refrigerant is present in the supply line 6, the inlet of exhaust line 81 captures this gas and guides it to evaporator 4, thus preventing gaseous refrigerant from entering air-suspended compressor 2. The opening and closing of solenoid valve 63 is adjusted by the control system based on the liquid level and pressure in supply tank 62 and the needs of air-suspended compressor 2 to achieve precise refrigerant supply.

[0082] In this way, solenoid valve 63 provides precise control over refrigerant flow, allowing adjustment of the supply volume according to the actual needs of the system. Meanwhile, the design of check valve 64 prevents unnecessary refrigerant backflow within the system, ensuring the cleanliness and efficiency of the supply line 6.

[0083] like Figures 1 to 3 As shown, according to some embodiments of the present invention, a filter is also provided on the liquid supply line 6, and the filter is located between the condenser 3 and the pump body 61. In this way, the filter can filter the refrigerant.

[0084] According to some embodiments of the present invention, the outlet of the evaporator 4 is connected to the liquid supply line 6 via a liquid replenishment line 83. The liquid replenishment line 83 is equipped with a liquid replenishment valve 84, and the inlet of the liquid replenishment line 83 is located between the filter and the condenser 3. The function of the liquid replenishment line 83 is as follows: when the amount of liquid refrigerant in the condenser 3 is low and cannot meet the liquid supply requirements of the air suspension compressor 2, the liquid replenishment valve 84 is opened. At this time, the pump body 61 can draw liquid refrigerant from the evaporator 4 to supply the liquid supply tank 62, thereby achieving sufficient liquid supply to the air suspension compressor 2.

[0085] like Figures 1 to 3 As shown, according to some embodiments of the present invention, a bypass pipe 85 is further provided between the condenser 3 and the evaporator 4, and a bypass expansion valve 86 is provided on the bypass pipe 85. The bypass pipe 85 and the bypass expansion valve 86 are used for start-up and shutdown, high pressure ratio control and low load unloading bypass.

[0086] like Figures 1 to 3 As shown, according to some embodiments of the present invention, a body cooling pipe 87 is also provided between the condenser 3 and the body cavity of the air suspension compressor 2. That is, the outlet of the condenser 3 is connected to the body cavity of the air suspension compressor 2 through the body cooling pipe 87, and a cooling expansion valve 88 is provided on the body cooling pipe 87.

[0087] It is understandable that when the body temperature of the air-suspension compressor 2 is too high, liquid refrigerant can flow out from the condenser 3 and enter the internal cavity of the air-suspension compressor 2 through the cooling expansion valve 88 for cooling. At this time, the system can adjust the opening of the cooling expansion valve 88 through PID to ensure that the motor temperature of the air-suspension compressor 2 is within a reasonable range.

[0088] like Figure 2 and Figure 3 As shown, according to some embodiments of the present invention, an economizer 91 or a flash evaporator 92 may be provided on the main refrigerant pipeline between the condenser 3 and the evaporator 4 in the main refrigerant circuit 1.

[0089] Understandable, such as Figure 2As shown, the economizer 91 is a heat exchanger that utilizes a portion of the heat from the high-pressure liquid refrigerant to preheat the refrigerant on the low-pressure side, thereby improving the system's energy efficiency. Located downstream of the condenser 3 on the main refrigerant line, the economizer 91 receives the high-pressure liquid refrigerant from the condenser 3 and transfers a portion of its heat to the low-pressure liquid refrigerant returning from the evaporator 4. This heat exchange reduces the load on the air-suspension compressor 2 because the refrigerant on the low-pressure side is preheated before entering the air-suspension compressor 2, thus reducing the compression workload of the air-suspension compressor 2.

[0090] like Figure 3 As shown, the flash evaporator 92 is a device that utilizes pressure reduction to cause partial evaporation of the refrigerant. When high-pressure liquid refrigerant enters the flash evaporator 92, due to the pressure reduction, the refrigerant rapidly flashes into a gaseous state, releasing heat. This released heat can be used to preheat the refrigerant entering the evaporator 4, or for other heat exchange processes, such as preheating the refrigerant entering the economizer 91.

[0091] like Figures 1 to 3 As shown, according to some embodiments of the present invention, a liquid level sensor is provided in the liquid supply tank 62. The refrigerant circulation system also includes a controller, which is connected to the pump body 61, the vent valve 82, the solenoid valve 63 and the liquid level sensor respectively. The controller is used to receive the liquid level information from the liquid level sensor and control the opening and closing of the pump body 61 and the solenoid valve 63 and the opening degree of the vent valve 82 according to the liquid level information.

[0092] In this embodiment, the controller is the brain of the refrigerant circulation system. It is connected to the pump body 61, the exhaust valve 82, the solenoid valve 63, and the liquid level sensor. It can make decisions based on real-time data and automatically adjust the working status of these components.

[0093] When the level sensor detects that the liquid level in the supply tank 62 is lower than the preset minimum safety value, the controller will instruct the solenoid valve 63 to open, allowing the pump body 61 to draw refrigerant from the condenser 3 and replenish it to the supply tank 62. When the liquid level reaches the preset maximum value, the controller will close the solenoid valve 63, stopping the refrigerant replenishment and preventing the supply tank 62 from overflowing.

[0094] The controller can also adjust the opening of the vent valve 82 based on the liquid level information. If excessive gaseous refrigerant is detected in the supply tank 62 and the supply line 6, the controller may open the vent valve 82 to release the gas, thereby reducing the amount of gaseous refrigerant in the supply line 6 and the supply tank 62.

[0095] The control method and control device for the refrigerant circulation system proposed in this invention are described below with reference to the accompanying drawings. Before providing a detailed description of the embodiments of this invention, the overall application scenario is first described. The control method, control device, electronic device, and computer-readable storage medium for the refrigerant circulation system of this invention can be applied locally to the refrigerant circulation system, to cloud platforms in the Internet field, or to other types of cloud platforms in the Internet field, or to third-party devices. These third-party devices may include various types such as mobile phones, tablets, laptops, in-vehicle computers, and other smart terminals.

[0096] The following description uses only the control method applicable to refrigerant circulation systems as an example. It should be understood that the control method of this embodiment can also be applied to cloud platforms and third-party devices.

[0097] like Figure 4 As shown, a control method for a refrigerant circulation system of an air-suspended compressor 2 according to a second aspect embodiment of the present invention includes:

[0098] Step S1: Obtain the refrigerant supply information in the refrigerant supply line 6;

[0099] Step S2: Based on the refrigerant supply information, control the switch of the regulating pump body 61 and / or the opening of the exhaust valve 82.

[0100] Furthermore, the refrigerant supply information includes information about the gaseous refrigerant in the supply line 6. Based on this refrigerant supply information, the steps of controlling the switching of the pump body 61 and / or the opening of the vent valve 82 specifically include:

[0101] If the gaseous refrigerant in the liquid supply line 6 meets the venting conditions, then the venting valve 82 is opened.

[0102] If the gaseous refrigerant in the liquid supply line 6 does not meet the venting conditions, the venting valve 82 is closed, and the pump body 61 is switched on and off according to the actual liquid level in the liquid supply tank 62.

[0103] Therefore, the second aspect of the present invention provides a control method for a refrigerant circulation system of an air-suspended compressor 2. This method obtains refrigerant supply information within the supply pipeline 6 and adjusts the operating states of the pump body 61 and the exhaust valve 82 based on this information to ensure efficient and stable system operation. The specific steps and logic of the control method are as follows:

[0104] First, in step S1, the system acquires refrigerant supply information. Specifically, the system obtains the refrigerant state within the refrigerant supply line 6 through sensors or other detection devices, including the presence and quantity of gaseous refrigerant. This information is crucial for subsequent control decisions.

[0105] Secondly, in step S2, the system needs to perform control and adjustment based on the refrigerant supply information. Specifically, step S2 involves two sub-steps, determining the on / off state of pump body 61 and exhaust valve 82 based on whether the gaseous refrigerant in the refrigerant supply line 6 meets the exhaust conditions.

[0106] Sub-step S2.1 addresses the situation where the exhaust conditions are met. Specifically, if the amount of gaseous refrigerant in the liquid supply line 6 reaches the set exhaust conditions (e.g., the proportion of gaseous refrigerant exceeds a preset threshold), the controller will instruct the exhaust valve 82 to open. At this time, due to the pressure difference between the evaporator 4 and the condenser 3, the gaseous refrigerant in the liquid supply line 6 will automatically enter the evaporator 4 under the action of the pressure difference to achieve the discharge of gaseous refrigerant. This allows the gaseous refrigerant to be discharged from the system, preventing it from adversely affecting the operation of the air-suspended compressor 2 and the pump body 61.

[0107] Sub-step S2.2 addresses the right to refuse venting. Specifically, if the amount of gaseous refrigerant in the supply line 6 does not meet the venting requirements, the controller will close the vent valve 82 to prevent unnecessary refrigerant loss. Simultaneously, the controller will control the switching on and off of the pump 61 based on the actual liquid level in the supply tank 62. If the liquid level in the supply tank 62 is too low, the controller will turn on the pump 61 to replenish the refrigerant; if the liquid level is too high, it may keep the pump 61 off or adjust its operating state to maintain the liquid level in the supply tank 62 within a safe range.

[0108] In summary, through the above control methods, the system can intelligently manage the refrigerant state within the liquid supply line 6, ensuring that the air-suspended compressor 2 and pump 61 operate in optimal condition, while simultaneously improving the energy efficiency and reliability of the entire refrigerant circulation system. This method reduces human intervention, increases the level of automation, and lowers operational complexity.

[0109] According to some embodiments of the present invention, it can be understood that the gaseous refrigerant in the liquid supply line 6 meets the venting conditions when there is too much gaseous refrigerant in the liquid supply line 6, thus requiring venting; and the gaseous refrigerant in the liquid supply line 6 does not meet the venting conditions when there is too little gaseous refrigerant or even none in the liquid supply line 6, thus requiring no venting. To determine whether the gaseous refrigerant in the liquid supply line 6 meets the venting conditions, the system can acquire different types of parameters to determine the venting conditions.

[0110] For example, obtaining the refrigerant level information in the supply tank 62: The refrigerant level in the supply tank 62 is monitored by a level sensor. If the level is too low, it may indicate that there is too much gaseous refrigerant in the supply line 6 because the liquid refrigerant has been excessively consumed. In this case, the system may need to bleed the gas to ensure that there is sufficient liquid refrigerant supplied to the air-suspended compressor 2.

[0111] For example, the duration of pump body 61's continuous shutdown can be monitored: if pump body 61 remains shut off for an extended period, it may cause a pressure drop in the liquid supply line 6, leading to the accumulation of gaseous refrigerant in the line. By monitoring the shutdown duration of pump body 61, the system can determine whether venting is necessary to restore normal refrigerant flow.

[0112] For example, monitor the pressure of the refrigerant supply line 6: Monitor the pressure of the refrigerant supply line 6 using a pressure sensor. If the pressure is below the normal range, it may indicate that gaseous refrigerant is occupying space in the line, and the pressure needs to be restored by bleeding.

[0113] For example, monitoring the operating status of the air-suspension compressor 2: If the operating efficiency of the air-suspension compressor 2 decreases or malfunctions, this may be due to excessive gaseous refrigerant in the liquid supply line 6. The system can determine whether venting is necessary by monitoring the performance parameters of the air-suspension compressor 2.

[0114] In addition, temperature changes within the refrigerant supply line 6 can also indicate the presence of gaseous refrigerant in certain situations. For example, if the temperature within the line is lower than expected, this could be due to heat loss caused by the presence of gaseous refrigerant.

[0115] In summary, through the aforementioned monitoring methods, the system can comprehensively determine whether the gaseous refrigerant in the liquid supply line 6 meets the venting conditions. If the venting conditions are met, the system will perform a venting operation; if not, the system will adjust the switch of the pump body 61 and the opening of the vent valve 82 to maintain a suitable state of the refrigerant in the liquid supply line 6. This intelligent control method improves the system's automation level and ensures the efficient and stable operation of the air-suspended compressor 2 and the pump body 61.

[0116] In some specific embodiments of the present invention, taking the acquisition of liquid level information in the liquid supply tank 62 as an example for detailed explanation, the step of acquiring liquid supply refrigerant information in the liquid supply pipeline 6 specifically includes:

[0117] If it is determined that the pump body 61 is currently in the off state, then the actual liquid level of the liquid supply tank 62 is obtained;

[0118] If the difference between the actual liquid level and the preset minimum liquid level is greater than zero and less than the preset liquid level difference, it is determined that the gaseous refrigerant in the liquid supply pipeline 6 meets the exhaust conditions.

[0119] Alternatively, if the difference between the actual liquid level and the preset minimum liquid level is less than or equal to zero, it is determined that the gaseous refrigerant in the liquid supply pipeline 6 does not meet the exhaust conditions.

[0120] In this embodiment, the system first checks the current status of the pump body 61. If the pump body 61 is in the off state, it means that no new refrigerant is flowing into the liquid supply line 6, so it is a suitable time to obtain refrigerant information in the liquid supply line 6.

[0121] With pump 61 closed, the system obtains the actual liquid level in supply tank 62 via a liquid level sensor. This liquid level data is crucial information for determining the state of the gaseous refrigerant in supply line 6. Subsequently, the system compares the actual liquid level with a preset minimum liquid level threshold, which is a safety value used to ensure that there is sufficient refrigerant in supply tank 62 to supply the air-suspended compressor 2.

[0122] If the actual liquid level is higher than the preset minimum liquid level, but the difference between the two is less than the preset liquid level difference, this indicates that there may be excessive gaseous refrigerant in the liquid supply line 6. In this case, the system will determine that the gaseous refrigerant in the liquid supply line 6 meets the venting conditions and a venting operation needs to be performed to restore normal liquid refrigerant supply.

[0123] If the difference between the actual liquid level and the preset minimum liquid level is less than or equal to zero, it means that the refrigerant in the supply tank 62 may have approached or reached the minimum safe level. In this case, the system will determine that the gaseous refrigerant in the supply line 6 does not meet the venting conditions, because venting may result in insufficient refrigerant in the supply tank 62, thereby affecting the normal operation of the air suspension compressor 2.

[0124] In some other specific embodiments of the present invention, taking the continuous shutdown duration of the pump body 61 as an example for detailed explanation, the step of obtaining the refrigerant information in the liquid supply pipeline 6 specifically includes:

[0125] If it is determined that the pump body 61 is currently in a closed state, then the duration of the continuous closure of the pump body 61 is obtained;

[0126] If the duration of continuous shutdown exceeds the first set duration, it is determined that the gaseous refrigerant in the liquid supply line 6 meets the venting conditions.

[0127] Alternatively, if the duration of continuous shutdown is less than the second set duration, it is determined that the gaseous refrigerant in the liquid supply line 6 does not meet the venting conditions. The first set duration is greater than or equal to the second set duration.

[0128] In this embodiment, if the pump body 61 is in the off state, the system records the elapsed time since the pump body 61 was turned off, i.e., the continuous off duration of the pump body 61. Subsequently, the system compares the recorded continuous off duration with two preset duration thresholds: a first preset duration and a second preset duration. These two duration thresholds are set based on system design and operational experience and are used to determine the accumulation of gaseous refrigerant in the liquid supply line 6.

[0129] If the pump body 61 remains closed for longer than a first set time, the system will determine that enough gaseous refrigerant has accumulated in the liquid supply line 6 to meet the venting conditions. This is because prolonged closure may cause a pressure drop in the line, leading to the accumulation of gaseous refrigerant in the line.

[0130] If the continuous shutdown time of pump body 61 is less than the second set duration, the system will determine that the gaseous refrigerant accumulation in the liquid supply line 6 is insufficient and the venting conditions are not met. This may be because the shutdown time is too short, and the gaseous refrigerant has not had enough time to accumulate in the line.

[0131] Finally, based on the judgment result, the system will perform the corresponding operation. If the venting conditions are met, the system may open the vent valve 82 to remove the gaseous refrigerant from the pipeline. If the venting conditions are not met, the system may keep the vent valve 82 closed and adjust the start-up timing of the pump body 61 or other relevant parameters as needed.

[0132] In this way, the system can intelligently determine the state of the gaseous refrigerant in the liquid supply line 6 based on the shutdown duration of pump 61, and adjust the venting operation accordingly to ensure the stable and efficient operation of the refrigerant circulation system. This control strategy helps avoid unnecessary venting operations, while ensuring that gaseous refrigerant can be removed in a timely manner when necessary, preventing a decrease in system efficiency.

[0133] Furthermore, after controlling the opening of the exhaust valve 82, if the gaseous refrigerant in the liquid supply line 6 meets the exhaust conditions, the process further includes:

[0134] The initial opening degree and / or continuous opening duration of the vent valve 82 are controlled according to the continuous closing duration of the pump body 61.

[0135] In this embodiment, the system sets the initial opening of the exhaust valve 82 based on the duration of pump body 61's closure. If the closure duration is long, the system may set a larger initial opening to expel accumulated gaseous refrigerant more quickly. Conversely, if the closure duration is short, the initial opening may be set smaller to avoid excessive venting.

[0136] In addition to the initial opening degree, the system also controls the continuous opening duration of the exhaust valve 82 based on the closing time of the pump body 61. If the closing time is long, the exhaust valve 82 may remain open for a longer period to ensure that the gaseous refrigerant is fully discharged. If the closing time is short, the opening duration of the exhaust valve 82 may be shortened accordingly.

[0137] In one specific embodiment, the step of controlling the initial opening degree and / or the continuous opening duration of the exhaust valve 82 based on the continuous closed duration of the pump body 61 specifically includes:

[0138] When the duration of continuous closure is within the first duration range, the initial opening degree of the control exhaust valve 82 is the first opening degree;

[0139] When the duration of continuous closure is within the second duration range, the initial opening degree of the control exhaust valve 82 is the second opening degree;

[0140] When the duration of continuous closure is within the third duration range, the initial opening degree of the control exhaust valve 82 is set to the maximum opening degree.

[0141] Among them, the first duration range is smaller than the second duration range, the second duration range is smaller than the third duration range, and the first opening degree is smaller than the second opening degree, and the second opening degree is smaller than the maximum opening degree.

[0142] In this embodiment, the system sets three different duration ranges (first duration range, second duration range, and third duration range) based on the continuous closed duration of the pump body 61. Each range corresponds to a specific initial opening degree (first opening degree, second opening degree, and maximum opening degree). The first duration range corresponds to the smallest initial opening degree (first opening degree), the second duration range corresponds to a medium initial opening degree (second opening degree), and the third duration range corresponds to the largest initial opening degree (maximum opening degree).

[0143] It is understandable that the above range and opening settings are based on empirical data and system design to ensure effective exhaust under different conditions.

[0144] In another specific embodiment, in the step of controlling the initial opening degree and / or continuous opening duration of the exhaust valve 82 based on the continuous closing duration of the pump body 61, the continuous opening duration is obtained as follows:

[0145] Establish the calculation formula for continuous shutdown duration and continuous on duration;

[0146] Substitute the current continuous shutdown duration of pump body 61 into the calculation formula to obtain the required continuous on duration of pump body 61.

[0147] Among them, the duration of continuous on is positively correlated with the duration of continuous off.

[0148] In this embodiment, to determine the continuous open duration of the exhaust valve 82, the system establishes a calculation formula that correlates the continuous closed duration of the pump body 61 with the required continuous open duration. This formula may be linear or non-linear, depending on the specific requirements and design of the system.

[0149] The system substitutes the current continuous closing duration into the calculation formula to obtain the required continuous opening duration of the exhaust valve 82. Specifically, the continuous opening duration is positively correlated with the continuous closing duration, meaning that the longer the closing duration, the longer the exhaust valve 82 needs to be open to ensure that the gaseous refrigerant is fully discharged.

[0150] The control device for the refrigerant circulation system of the air-suspended compressor 2 provided by the present invention will be described below. The control device for the refrigerant circulation system of the air-suspended compressor 2 described below can be referred to in correspondence with the control method for the refrigerant circulation system of the air-suspended compressor 2 described above.

[0151] like Figure 5 As shown, a control device for a refrigerant circulation system of an air-suspended compressor 2 according to a third aspect embodiment of the present invention includes:

[0152] The acquisition module is used to acquire information about the refrigerant supply in the liquid supply pipeline 6;

[0153] The control module is used to control the switching of the pump body 61 and / or the opening of the exhaust valve 82 based on the supply refrigerant information.

[0154] Figure 6 An example is a schematic diagram of the physical structure of an electronic device, such as... Figure 6 As shown, the electronic device may include a processor 810, a communication interface 820, a memory 830, and a communication bus 840. The processor 810, communication interface 820, and memory 830 communicate with each other via the communication bus 840. The processor 810 can call logic instructions from the memory 830 to execute a control method for the refrigerant circulation system, including: acquiring refrigerant supply information in the refrigerant supply line 6; and controlling the switching of the regulating pump 61 and / or the opening of the exhaust valve 82 based on the refrigerant supply information.

[0155] Furthermore, the logical instructions in the aforementioned memory 830 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0156] On the other hand, the present invention also provides a computer program product, which includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the control method of the refrigerant circulation system provided by the above methods, including: acquiring refrigerant supply information in the refrigerant supply pipeline 6; and controlling the switching of the regulating pump body 61 and / or the opening of the exhaust valve 82 according to the refrigerant supply information.

[0157] In another aspect, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements a control method for the refrigerant circulation system provided by the above methods, including: acquiring refrigerant supply information in the refrigerant supply line 6; and controlling the switching of the regulating pump body 61 and / or the opening of the exhaust valve 82 according to the refrigerant supply information.

[0158] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0159] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., including several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods of various embodiments or some parts of embodiments.

[0160] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A refrigerant circulation system for an air-suspension compressor, characterized in that, include: The main refrigerant circuit includes an air-suspended compressor, a condenser, an evaporator, and an electronic expansion valve connected in sequence. The air-suspended compressor has a first inlet on its air-bearing structure and a first outlet on its body. Both the first inlet and the first outlet are connected to the internal cavity of the compressor body. The condenser outlet is connected to the first inlet via the liquid supply line, and the first outlet is connected to the evaporator via the liquid drain line. The liquid supply pipeline is equipped with a pump body, and the liquid supply pipeline is also equipped with an exhaust pipeline connected to the evaporator, and the exhaust pipeline is equipped with an exhaust valve; The liquid supply pipeline is also equipped with a solenoid valve and a check valve. The inlet of the exhaust pipeline is located between the solenoid valve and the pump body. When the pump body is closed and the refrigerant is blocked by the solenoid valve, the refrigerant circulation system discharges the gaseous refrigerant in the liquid supply pipeline through the exhaust pipeline. The liquid supply pipeline is equipped with a liquid supply tank; the liquid supply tank is equipped with a second liquid inlet, a second liquid outlet and an exhaust port, the second liquid inlet is connected to the pump body, the second liquid outlet is connected to the first inlet and the exhaust port is connected to the evaporator; the two ends of the one-way valve are respectively connected to the second liquid inlet and the outlet of the solenoid valve, and the two ends of the solenoid valve are respectively connected to the inlet of the one-way valve and the outlet of the pump body.

2. The refrigerant circulation system for an air-suspension compressor according to claim 1, characterized in that, The liquid supply tank is equipped with a liquid level sensor; The refrigerant circulation system also includes a controller, which is connected to the pump body, the exhaust valve, the solenoid valve and the liquid level sensor respectively. The controller is used to receive the liquid level information from the liquid level sensor and control the opening and closing of the pump body and the solenoid valve and the opening degree of the exhaust valve according to the liquid level information.

3. A control method for a refrigerant circulation system of an air-suspension compressor based on any one of claims 1 to 2, characterized in that, include: Obtain the refrigerant information in the supply pipeline; Based on the refrigerant supply information, control and adjust the switch of the pump body and / or the opening of the exhaust valve.

4. The control method for the refrigerant circulation system of an air-suspension compressor according to claim 3, characterized in that, The refrigerant supply information includes information about the gaseous refrigerant in the refrigerant supply pipeline; The step of controlling and adjusting the switch of the pump body and / or the opening degree of the exhaust valve based on the refrigerant supply information specifically includes: If the gaseous refrigerant in the supply pipeline meets the venting conditions, then the venting valve is opened. If the gaseous refrigerant in the supply pipeline does not meet the venting conditions, the venting valve is closed, and the pump body is switched on and off according to the actual liquid level in the supply tank.

5. The control method for the refrigerant circulation system of an air-suspension compressor according to claim 4, characterized in that, The step of obtaining the refrigerant information in the refrigerant supply pipeline specifically includes: If the pump body is determined to be currently in a closed state, then the actual liquid level of the supply tank is obtained; If the difference between the actual liquid level and the preset minimum liquid level is greater than zero and less than the preset liquid level difference, it is determined that the gaseous refrigerant in the liquid supply pipeline meets the exhaust conditions. Alternatively, if the difference between the actual liquid level and the preset minimum liquid level is less than or equal to zero, it is determined that the gaseous refrigerant in the liquid supply pipeline does not meet the exhaust conditions.

6. The control method for the refrigerant circulation system of an air-suspended compressor according to claim 4, characterized in that, The step of obtaining the refrigerant information in the refrigerant supply pipeline specifically includes: If it is determined that the pump body is currently in a closed state, then the duration of the pump body's continuous closure is obtained; If the duration of continuous shutdown exceeds the first set duration, it is determined that the gaseous refrigerant in the liquid supply line meets the exhaust conditions. Alternatively, if the duration of continuous shutdown is less than the second set duration, it is determined that the gaseous refrigerant in the liquid supply line does not meet the exhaust conditions. Wherein, the first set duration is greater than or equal to the second set duration.

7. The control method for the refrigerant circulation system of an air-suspension compressor according to claim 6, characterized in that, After the step of controlling the vent valve to open when the gaseous refrigerant in the liquid supply line meets the venting conditions, the method further includes: The initial opening degree and / or continuous opening duration of the exhaust valve are controlled and adjusted according to the continuous closed duration of the pump body.

8. The control method for the refrigerant circulation system of an air-suspension compressor according to claim 7, characterized in that, The step of controlling and adjusting the initial opening degree and / or continuous opening duration of the exhaust valve based on the continuous closed duration of the pump body specifically includes: When the duration of continuous closure is within the first duration range, the initial opening degree of the exhaust valve is controlled to be the first opening degree; When the duration of continuous closure is within the second duration range, the initial opening degree of the exhaust valve is controlled to be the second opening degree; When the duration of continuous closure is within the third duration range, the initial opening degree of the exhaust valve is controlled to be the maximum opening degree; Wherein, the first duration range is less than the second duration range, the second duration range is less than the third duration range, and the first opening degree is less than the second opening degree, and the second opening degree is less than the maximum opening degree.

9. The control method for the refrigerant circulation system of an air-suspension compressor according to claim 7, characterized in that, In the step of controlling and adjusting the initial opening degree and / or continuous opening duration of the exhaust valve based on the continuous closing duration of the pump body, the continuous opening duration is obtained as follows: Establish the calculation formula for the continuous off duration and the continuous on duration; Substitute the current continuous shutdown duration of the pump body into the calculation formula to obtain the required continuous on duration of the pump body; The duration of continuous on is positively correlated with the duration of continuous off.

10. A control device for a refrigerant circulation system of an air-suspension compressor based on any one of claims 1 to 2, characterized in that, include: The acquisition module is used to acquire information about the refrigerant supply in the liquid supply pipeline; The control module is used to control and adjust the switching of the pump body and / or the opening degree of the exhaust valve based on the liquid refrigerant information.

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