Gas-liquid separator, air conditioning system and control method of air conditioning system

Abstract

The invention provides a gas-liquid separator, an air conditioning system and a control method of the air conditioning system. The gas-liquid separator comprises a shell, a gas inlet, a gas outlet and a liquid outlet, wherein the shell is provided with a containing cavity, and a gas-liquid inlet, a gas outlet and a liquid outlet which communicate with the containing cavity; the partition plate is arranged in the containing cavity to divide the containing cavity into an upper cavity body and a lower cavity body, the upper cavity body communicates with the gas-liquid inlet and the gas outlet, and the lower cavity body communicates with the liquid outlet; a first communicating hole for communicating the upper cavity with the lower cavity is formed in the partition plate; and the adjusting valve is arranged in the first communicating hole, so that the open area of the communicating hole is adjusted by controlling the opening degree of the adjusting valve, and the problem that the function of the gas-liquid separator of the air conditioning system in the prior art cannot be dynamically adjusted along with the load change of the air conditioning system is solved.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and more specifically, to a gas-liquid separator, an air conditioning system, and a control method thereof. Background Technology

[0002] In multi-split air conditioning systems, the refrigerant at the evaporator outlet often exists in the form of a two-phase gas-liquid refrigerant. If it enters the compressor directly without effective separation, it is easy to cause a "liquid slugging" fault, which seriously affects the compressor's lifespan and the stability of the air conditioning system.

[0003] In existing technologies, single-layer gas-liquid separators or fixed-structure double-layer separators are commonly used. Their separation capacity is fixed and cannot be dynamically adjusted according to changes in the air conditioning system load. When the air conditioning system is running at low load, the refrigerant flow is small, and the liquid droplets in the separator settle sufficiently, but some separator space is wasted. When the air conditioning system is running at high load, the separation capacity may be insufficient, leading to an increased risk of liquid slugging.

[0004] In addition, existing air conditioning systems lack the ability to utilize the "dynamic storage" of refrigerant within the separator, making it impossible to achieve intelligent refrigerant scheduling and improve the stability of the air conditioning system. Summary of the Invention

[0005] The main objective of this invention is to provide a gas-liquid separator, an air conditioning system, and a control method thereof, in order to solve the problem that the function of the gas-liquid separator in the existing air conditioning system cannot be dynamically adjusted according to the load changes of the air conditioning system.

[0006] To achieve the above objectives, according to a first aspect of the present invention, a gas-liquid separator is provided, comprising: a housing having a receiving cavity and a gas-liquid inlet, a gas outlet, and a liquid outlet respectively communicating with the receiving cavity; a partition plate disposed within the receiving cavity to divide the receiving cavity into an upper cavity and a lower cavity, the upper cavity communicating with the gas-liquid inlet and the gas outlet respectively, and the lower cavity communicating with the liquid outlet; the partition plate being provided with a first connecting hole for connecting the upper cavity and the lower cavity; and a regulating valve disposed within the first connecting hole to adjust the flow area of ​​the connecting hole by controlling the opening degree of the regulating valve.

[0007] Furthermore, the gas-liquid separator also includes a liquid collection net, which is disposed in the upper cavity and located below the gas-liquid inlet and the gas outlet, so as to divide the upper cavity into a first cavity segment and a second cavity segment arranged sequentially from top to bottom; wherein, the liquid collection net is provided with a second connecting hole, the upper end of the second connecting hole is connected to the gas-liquid inlet, and the lower end of the second connecting hole is connected to the second cavity segment; the liquid collection net and the gas outlet are spaced apart.

[0008] Furthermore, the gas-liquid separator includes a gas-liquid inlet pipe, the inlet of which is connected to the outlet of the evaporator of the air conditioning system, and the outlet of which is inserted into the upper cavity through the gas-liquid inlet and connected to the second connecting hole.

[0009] Furthermore, the gas-liquid separator includes: a flow channel, which is disposed within the second cavity and extends along a predetermined trajectory, with its upper end connected to the lower end of the second connecting hole; and a flow guide plate, which is disposed within the second cavity and located below the flow channel, with one end of the flow guide plate connected to the housing and the other end of the flow guide plate facing the first connecting hole; wherein the lower end of the flow channel faces the upper surface of the flow guide plate.

[0010] Furthermore, the predetermined trajectory is a spiral.

[0011] Furthermore, the gas-liquid separator includes: a liquid level detection component, at least a portion of which is disposed in the lower cavity and connected to the control module of the air conditioning system, for detecting the liquid level in the lower cavity and transmitting the detection result to the control module; and a control valve disposed at the liquid outlet and connected to the control module of the air conditioning system, wherein the control module controls the opening degree of the control valve according to the detection result of the liquid level detection component.

[0012] Furthermore, the gas-liquid separator includes: a gas-liquid inlet pipe, the inlet of which is connected to the outlet of the evaporator of the air conditioning system, and the outlet of which is inserted into the upper cavity through the gas-liquid inlet; and / or, a gas outlet pipe, the inlet of which is inserted into the upper cavity through the gas outlet, and the outlet of which is connected to the gas inlet of the compressor of the air conditioning system; and / or, a liquid outlet pipe, the inlet of which is inserted into the lower cavity through the liquid outlet, and the outlet of which is connected to the liquid inlet of the evaporator of the air conditioning system.

[0013] According to a second aspect of the present invention, an air conditioning system is provided, including the gas-liquid separator described above. The air conditioning system further includes: an evaporator, the outlet of which is connected to the gas-liquid inlet of the gas-liquid separator, and the liquid inlet of the evaporator being connected to the liquid outlet of the gas-liquid separator; a compressor, the gas inlet of which is connected to the gas outlet of the gas-liquid separator; and a control module, which is connected to the regulating valve of the gas-liquid separator to control the opening degree of the regulating valve according to the actual air conditioning system load rate A of the air conditioning system.

[0014] According to a third aspect of the present invention, an air conditioning system control method is provided, applicable to the aforementioned air conditioning system. The air conditioning system control method includes: when the air conditioning system is running, obtaining the actual air conditioning system load rate A; determining the magnitude relationship between the actual air conditioning system load rate A and a first preset load rate A1 and a second preset load rate A2; controlling the opening degree of a regulating valve according to the determination result; wherein the first preset load rate A1 is greater than the second preset load rate A2.

[0015] Furthermore, the air conditioning system control method includes: when A > A1, determining the relationship between the actual operating frequency f of the air conditioning system compressor and the rated operating frequency f1; if f > 0.85f1, controlling the opening of the regulating valve to 100%, and controlling the connection between the liquid inlet of the evaporator and the liquid outlet of the gas-liquid separator.

[0016] Furthermore, the air conditioning system control method includes: if f≤0.85f1, then controlling the opening of the regulating valve within a first preset opening range, and controlling the disconnection between the liquid inlet of the evaporator and the liquid outlet of the gas-liquid separator; continuing to determine the relationship between the liquid level P in the lower cavity and the preset liquid level P1; if P>P1, then controlling the connection between the liquid inlet of the evaporator and the liquid outlet of the gas-liquid separator within a first preset time period; if P≤P1, then returning to the steps that started with controlling the opening of the regulating valve within a first preset opening range and controlling the disconnection between the liquid inlet of the evaporator and the liquid outlet of the gas-liquid separator.

[0017] Further, when A1≥A≥A2, the opening degree of the control valve is controlled within the second preset opening degree range, and the liquid inlet of the evaporator is disconnected from the liquid outlet of the gas-liquid separator; the relationship between the liquid level P in the lower cavity and the preset liquid level P1, and the relationship between the superheat S at the outlet of the evaporator of the air conditioning system and the preset superheat S1 are determined; if P>P1 and S<S1, the liquid inlet of the evaporator is connected to the liquid outlet of the gas-liquid separator for a first preset time period, and then the process returns to the step that started with continuing to determine the relationship between the liquid level P in the lower cavity and the preset liquid level P1, and the relationship between the superheat S at the outlet of the evaporator of the air conditioning system and the preset superheat S1; if P≤P1 or S≥S1, the process returns to the step that started with controlling the opening degree of the control valve within the second preset opening degree range and disconnecting the liquid inlet of the evaporator from the liquid outlet of the gas-liquid separator.

[0018] Further, when A < A2, the opening degree of the control valve is controlled within the third preset opening degree range, and the liquid inlet of the evaporator is disconnected from the liquid outlet of the gas-liquid separator; the relationship between the liquid level P in the lower cavity and the preset liquid level P1, and the relationship between the superheat S at the outlet of the evaporator of the air conditioning system and the preset superheat S1 are determined; if P > P1 and S < S1, the liquid inlet of the evaporator is connected to the liquid outlet of the gas-liquid separator for a first preset time period, and then the process returns to the step that started by continuing to determine the relationship between the liquid level P in the lower cavity and the preset liquid level P1, and the relationship between the superheat S at the outlet of the evaporator of the air conditioning system and the preset superheat S1; if P ≤ P1 or S ≥ S1, the process returns to the step that started by controlling the opening degree of the control valve within the second preset opening degree range and disconnecting the liquid inlet of the evaporator from the liquid outlet of the gas-liquid separator.

[0019] According to the technical solution of this invention, the gas-liquid separator includes: a shell having a receiving cavity and a gas-liquid inlet, a gas outlet, and a liquid outlet respectively communicating with the receiving cavity; a partition plate disposed within the receiving cavity to divide the receiving cavity into an upper cavity and a lower cavity, the upper cavity communicating with the gas-liquid inlet and the gas outlet respectively, and the lower cavity communicating with the liquid outlet; a first connecting hole provided on the partition plate for connecting the upper cavity and the lower cavity; and a regulating valve disposed within the first connecting hole, i.e., between the upper cavity and the lower cavity, the regulating valve supports continuous opening adjustment of %~% to adjust the flow area of ​​the connecting hole by controlling the opening of the regulating valve, thereby adjusting the communication state between the upper cavity and the lower cavity. The gas-liquid separator of this invention, by providing a first connecting hole on the partition plate of the shell and installing a regulating valve within the first connecting hole, achieves effective control of the flow area of ​​the first connecting hole, solving the problem in the prior art that the function of the gas-liquid separator in the air conditioning system cannot be dynamically adjusted according to load changes. When the air conditioning system operates under high load, the opening of the regulating valve increases, improving the gas-liquid flow efficiency between the upper and lower chambers, thereby enhancing gas-liquid separation efficiency. This ensures that the refrigerant flowing from the gas outlet is pure gas, reducing the risk of liquid slugging in the compressor and enhancing the stability of the air conditioning system. Conversely, when the air conditioning system operates under low load, the opening of the regulating valve decreases, even approaching closure, to convert the lower chamber into a temporary storage area for liquid refrigerant. This not only effectively absorbs and controls the liquid refrigerant at the evaporator outlet, avoiding refrigerant waste caused by excessive separation capacity, but also provides a dynamic refrigerant buffer for the air conditioning system, reducing evaporator fluctuations, minimizing the risk of liquid slugging in the compressor, and improving the energy efficiency and operational stability of the air conditioning system. This load-adaptive gas-liquid separator, through precise adjustment of the regulating valve opening, achieves automatic switching of the gas-liquid separator's function, effectively resolving the contradiction between the working efficiency and stability of the gas-liquid separator under different loads, and significantly improving the operating performance of the air conditioning system over a wide load range. Attached Figure Description

[0020] The accompanying drawings, which form part of this specification, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 A simplified schematic diagram of an embodiment of a gas-liquid separator provided according to the present invention is shown; Figure 2 A schematic diagram of the internal structure of an embodiment of a gas-liquid separator provided according to the present invention is shown; Figure 3 A control flowchart of an embodiment of an air conditioning system and its control method provided according to the present invention is shown; Figure 4 It shows Figure 3The diagram shows a partial control flowchart of the air conditioning system and its control method. Figure 5 A partial control flowchart of an embodiment of an air conditioning system and its control method provided according to the present invention is shown.

[0021] The above figures include the following reference numerals: 100. Gas-liquid separator; 1. Shell; 11. Receiving cavity; 111. Upper cavity; 112. Lower cavity; 113. Liquid collection screen; 114. First cavity section; 115. Second cavity section; 116. Flow guide channel; 117. Flow guide plate; 12. Gas-liquid inlet; 121. Gas-liquid inflow pipe; 13. Gas outlet; 131. Gas outflow pipe; 14. Liquid outlet; 141. Liquid outflow pipe; 2. Divider plate; 3. Regulating valve; 4. Evaporator; 5. Compressor; 6. Liquid level detection component; 8. Control valve. Detailed Implementation

[0022] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0023] like Figure 1 and Figure 2 As shown, the present invention provides a gas-liquid separator 100, comprising: a housing 1 having a receiving cavity 11 and a gas-liquid inlet 12, a gas outlet 13, and a liquid outlet 14 respectively communicating with the receiving cavity 11; a partition plate 2 disposed within the receiving cavity 11 to divide the receiving cavity 11 into an upper cavity 111 and a lower cavity 112, the upper cavity 111 communicating with the gas-liquid inlet 12 and the gas outlet 13 respectively, and the lower cavity 112 communicating with the liquid outlet 14; the partition plate 2 having a first connecting hole for connecting the upper cavity 111 and the lower cavity 112; and a regulating valve 3 disposed within the first connecting hole, i.e., between the upper cavity 111 and the lower cavity 112, the regulating valve 3 supporting continuous opening adjustment from 0% to 100%, so as to adjust the flow area of ​​the connecting hole by controlling the opening of the regulating valve 3, thereby adjusting the communication state between the upper cavity 111 and the lower cavity 112.

[0024] The gas-liquid separator 100 of the present invention achieves effective control of the flow area of ​​the first connecting hole by providing a first connecting hole on the partition plate 2 of the housing 1 and installing a regulating valve 3 in the first connecting hole, thus solving the problem that the function of the gas-liquid separator 100 in the prior art cannot be dynamically adjusted according to load changes. When the air conditioning system is running under high load, the opening of the regulating valve 3 increases, which can improve the gas-liquid flow efficiency between the upper cavity 111 and the lower cavity 112, thereby improving the gas-liquid separation efficiency, ensuring that the refrigerant flowing out from the gas outlet 13 is pure gas, and enhancing the stability of the air conditioning system operation. When the air conditioning system is running under low load, the opening of the regulating valve 3 decreases, or even approaches closure, to convert the lower cavity 112 into a temporary storage area for liquid refrigerant. This not only effectively absorbs and controls the liquid refrigerant at the outlet of the evaporator 4, avoiding refrigerant waste caused by excessive separation capacity, but also provides a dynamic refrigerant buffer for the air conditioning system, reducing the fluctuation of the evaporator 4, reducing the risk of liquid slugging in the compressor 5, and improving the energy efficiency and operational stability of the air conditioning system. This gas-liquid separator 100, which is based on the load adaptive adjustment of the air conditioning system, realizes the automatic switching of the function of the gas-liquid separator 100 by finely adjusting the opening of the regulating valve 3. It effectively solves the contradiction between the working efficiency and stability of the gas-liquid separator 100 under different loads and significantly improves the operating performance of the air conditioning system in a wide load range.

[0025] like Figure 2 As shown, the gas-liquid separator 100 also includes a liquid collection net 113, which is disposed inside the upper cavity 111 and below the gas-liquid inlet 12 and the gas outlet 13, to divide the upper cavity 111 into a first cavity section 114 and a second cavity section 115 arranged sequentially from top to bottom; wherein, the liquid collection net 113 is provided with a second connecting hole, the upper end of the second connecting hole is connected to the gas-liquid inlet 12, and the lower end of the second connecting hole is connected to the second cavity section 115; the liquid collection net 113 and the gas outlet 13 are spaced apart.

[0026] In this invention, a liquid trapping net 113 is added inside the upper cavity 111 of the gas-liquid separator 100. The liquid trapping net 113 is located below the gas-liquid inlet 12 and the gas outlet 13, dividing the upper cavity into a first cavity section 114 and a second cavity section 115. A second connecting hole is opened on the liquid trapping net 113, the upper end of which is connected to the gas-liquid inlet 12, and the lower end of which is connected to the second cavity section 115, forming a unique flow channel structure. Furthermore, the liquid trap 113 is kept at a certain distance from the gas outlet 13 to prevent the separated droplets from being re-entrained into the airflow. This fully utilizes gravity and the interception effect of the liquid trap 113, enhancing the gas-liquid separation performance of the upper cavity 111. This is particularly significant when the air conditioning system is operating under high load. It can effectively improve the gas-liquid separation efficiency, reduce the risk of liquid refrigerant accidentally entering the compressor, and achieve dynamic balance and efficient utilization of the refrigerant through precise fluid management. This improves the application efficiency of the gas-liquid separator 100 in the air conditioning system and enhances the stability and reliability of the entire air conditioning system, especially when dealing with complex load conditions.

[0027] like Figure 2 As shown, the gas-liquid separator 100 includes a gas-liquid inlet pipe 121. The inlet of the gas-liquid inlet pipe 121 is used to connect to the outlet of the evaporator 4 of the air conditioning system. The outlet of the gas-liquid inlet pipe 121 is inserted into the upper cavity 111 through the gas-liquid inlet 12 and connected to the second connecting hole.

[0028] In this invention, the gas-liquid separator 100 is designed with a gas-liquid inflow pipe 121, which is connected to the outlet of the evaporator 4 to guide the gas-liquid two-phase refrigerant into the upper cavity 111. The outlet of the gas-liquid inflow pipe 121 is precisely positioned inside the upper cavity 111 through the gas-liquid inlet 12 and establishes a fluid channel with the second connecting hole, ensuring that the refrigerant can flow smoothly from the evaporator 4 into the gas-liquid separator 100. This not only provides an efficient gas-liquid separation path, but also effectively guides the liquid refrigerant to the lower cavity 112 for temporary storage when the air conditioning system is running at low load, realizing dynamic management and redistribution of the refrigerant, thereby optimizing the operating efficiency and stability of the entire air conditioning system.

[0029] As the load on the air conditioning system changes, the interaction between the upper cavity 111 and the lower cavity 112 can be flexibly adjusted by precisely controlling the opening of the regulating valve 3. This ensures that the gas-liquid separator 100 can work in the best condition under any operating conditions, effectively avoiding liquid slugging in the compressor 5, mitigating fluctuations in the liquid supply to the evaporator 4, and improving the air conditioning system's adaptability to load changes and overall performance.

[0030] like Figure 2As shown, the gas-liquid separator 100 includes: a flow channel 116, which is disposed within the second cavity section 115 and extends along a predetermined trajectory, with the upper end of the flow channel 116 communicating with the lower end of the second connecting hole; and a flow guide plate 117, which is disposed within the second cavity section 115 and located below the flow channel 116, with one end of the flow guide plate 117 connected to the housing 1 and the other end of the flow guide plate 117 facing the first connecting hole; wherein, the lower end of the flow channel 116 faces the upper surface of the flow guide plate 117.

[0031] In this invention, the flow channel 116 is disposed in the second cavity 115 and extends along a predetermined trajectory. Its upper end is connected to the lower end of the second connecting hole, ensuring that the gas-liquid two-phase refrigerant can smoothly enter the second cavity 115 for further separation. The flow guide plate 117 is located in the second cavity 115, with one end fixed to the housing 1 and the other end facing the first connecting hole. The lower end of the flow channel 116 is aligned with the upper surface of the flow guide plate 117, guiding the liquid refrigerant to settle towards the first connecting hole, enhancing the gas-liquid separation effect, and allowing the liquid refrigerant separated from the flow channel 116 to directly settle into the lower cavity 112 under the action of the flow guide plate 117, avoiding secondary suspension of droplets and improving the gas-liquid separation efficiency.

[0032] Overall, through the synergistic effect of the flow channel 116 and the flow plate 117, the gas-liquid separator 100 of the present invention not only ensures the gas-liquid separation effect, but also achieves effective distribution and storage of refrigerant, further improving the operational stability and energy efficiency ratio of the air conditioning system, effectively avoiding liquid slugging, and protecting the compressor 5 from damage.

[0033] like Figure 2 As shown, the predetermined trajectory is a spiral. During the operation of the air conditioning system, the refrigerant follows a spiral path when flowing through the second chamber 115 of the gas-liquid separator 100. This design fully utilizes the principles of fluid mechanics, enhancing the gas-liquid separation effect by extending the residence time of the two-phase refrigerant in the gas-liquid separator 100. Especially during low-load operation, the spiral trajectory helps the liquid continue to settle down to the lower chamber 112 along the predetermined path after initial separation in the upper chamber 111. This not only improves the separation efficiency but also promotes the dynamic storage and redistribution of the refrigerant, effectively addressing fluctuations in the liquid supply of the evaporator 4, reducing the start-stop frequency of the compressor 5, and ultimately achieving the goal of improving the energy efficiency and enhancing the operational stability of the air conditioning system.

[0034] Of course, the specific shape of the predetermined trajectory can also be adjusted according to the needs of the air conditioning system, such as changing it to a straight line or other curves, in order to achieve the best separation and storage effect.

[0035] In other embodiments not shown in the figure, the gas-liquid separation performance can be further optimized by changing the pitch and number of turns of the helix to adapt to a wider range of working conditions.

[0036] like Figure 2 As shown, the gas-liquid separator 100 includes: a liquid level detection component 6, at least a portion of which is disposed in the lower cavity 112 and connected to the control module of the air conditioning system, for detecting the liquid level in the lower cavity 112 and transmitting the detection result to the control module; and a control valve 8, which is disposed at the liquid outlet 14 and connected to the control module of the air conditioning system, wherein the control module controls the opening degree of the control valve 8 according to the detection result of the liquid level detection component 6.

[0037] In this invention, the gas-liquid separator 100 integrates a liquid level detection component 6 and a control valve 8. At least a portion of the liquid level detection component 6 is located within the lower cavity 112 and maintains a communication connection with the control module of the air conditioning system to monitor the liquid level changes in the lower cavity 112 in real time. The control valve 8 is located at the liquid outlet 14 and is also communication-connected to the control module. During air conditioning system operation, the control module dynamically adjusts the opening of the control valve 8 based on the detection results of the liquid level detection component 6, achieving precise control of the refrigerant flow. This ensures that the gas-liquid separator 100 can flexibly adapt to different load conditions. By intelligently adjusting the storage and release of refrigerant, it improves the overall operating efficiency and reliability of the air conditioning system, avoids liquid slugging in the compressor 5, and optimizes the liquid supply status of the evaporator 4, enhancing the stability of the air conditioning system under low load and the safety under high load.

[0038] like Figure 2 As shown, the gas-liquid separator 100 includes: a gas-liquid inlet pipe 121, the inlet of which is connected to the outlet of the evaporator 4 of the air conditioning system, and the outlet of which is inserted into the upper cavity 111 through the gas-liquid inlet 12; and / or, a gas outlet pipe 131, the inlet of which is inserted into the upper cavity 111 through the gas outlet 13, and the outlet of which is connected to the gas inlet of the compressor 5 of the air conditioning system; and / or, a liquid outlet pipe 141, the inlet of which is inserted into the lower cavity 112 through the liquid outlet 14, and the outlet of which is connected to the liquid inlet of the evaporator 4 of the air conditioning system.

[0039] In this invention, the gas-liquid separator integrates a gas-liquid inlet pipe 121, a gas outlet pipe 131, and a liquid outlet pipe 141. The precise layout of these components enables effective management of the refrigerant in the air conditioning system. The gas-liquid inlet pipe 121 is directly connected to the outlet of the evaporator 4, guiding the gas and liquid refrigerant into the upper cavity 111 for separation. The gas outlet pipe 131 extends from the upper cavity 111, ensuring that the separated gaseous refrigerant can smoothly enter the compressor 5. The liquid outlet pipe 141 connects the lower cavity 112 and the liquid inlet of the evaporator 4, responsible for resupplying the separated liquid refrigerant to the evaporator 4. This not only optimizes the refrigerant circulation path in the air conditioning system but also enhances the functional versatility of the gas-liquid separator 100 and the adaptability of the air conditioning system by precisely controlling the fluid dynamics between each pipe and cavity.

[0040] This invention provides an air conditioning system, including the aforementioned gas-liquid separator 100. The air conditioning system further includes: an evaporator 4, the outlet of which is connected to the gas-liquid inlet 12 of the gas-liquid separator 100, and the liquid inlet of which is connected to the liquid outlet 14 of the gas-liquid separator 100; a compressor 5, the gas inlet of which is connected to the gas outlet 13 of the gas-liquid separator 100; and a control module, which is connected to the regulating valve 3 of the gas-liquid separator 100 to control the opening degree of the regulating valve 3 according to the actual air conditioning system load rate A of the air conditioning system.

[0041] In the air conditioning system of this invention, the outlet of the evaporator 4 is connected to the gas-liquid inlet 12 of the gas-liquid separator 100, ensuring that the two-phase refrigerant flowing from the evaporator 4 can enter the gas-liquid separator 100 for processing; the liquid inlet of the evaporator 4 is connected to the liquid outlet 14 of the gas-liquid separator 100, allowing the separated liquid refrigerant to smoothly return to the evaporator 4 for recirculation; the gas inlet of the compressor 5 is connected to the gas outlet 13 of the gas-liquid separator 100, ensuring that the gaseous refrigerant after efficient separation is introduced into the compressor 5 to continue the air conditioning system circulation. The control module of the air conditioning system is communicatively connected to the regulating valve 3 in the gas-liquid separator 100 to precisely adjust the opening of the regulating valve 3 according to the actual air conditioning system load rate A, thereby realizing dynamic adjustment of the function of the gas-liquid separator 100. Under high load operation, the control module will increase the opening of the regulating valve 3 to ensure that the gas-liquid separator 100 can fully cope with the separation requirements of large flow of refrigerant, improving the safety and efficiency of the air conditioning system operation. Under low-load operation, the control module reduces the opening of the regulating valve 3, converting the lower chamber 112 of the gas-liquid separator 100 into a temporary storage space for refrigerant. This effectively suppresses fluctuations in the liquid supply of the evaporator 4, greatly reduces the possibility of liquid slugging in the compressor 5, avoids resource waste caused by excessive separation capacity, and further enhances the stability and energy efficiency of the air conditioning system.

[0042] like Figure 3 and Figure 4 As shown, the present invention provides an air conditioning system control method, which includes: when the air conditioning system is running, obtaining the actual air conditioning system load rate A; determining the relationship between the actual air conditioning system load rate A and the first preset load rate A1 and the second preset load rate A2; controlling the opening degree of the regulating valve 3 according to the determination result; wherein, the first preset load rate A1 is greater than the second preset load rate A2.

[0043] The air conditioning system control method of the present invention is applied to an air conditioning system including the gas-liquid separator 100 described above. By dynamically adjusting the opening of the regulating valve 3, intelligent switching between the gas-liquid separation function and the refrigerant storage function is achieved during the operation of the air conditioning system. Specifically, when the air conditioning system is operating under high load, increasing the opening of the regulating valve 3 increases the fluid exchange between the upper cavity 111 and the lower cavity 112, effectively improving the gas-liquid separation efficiency and ensuring that the refrigerant discharged from the gas outlet 13 is in a pure gaseous state, thereby enhancing the stability and reliability of the air conditioning system. Under low load operating conditions, decreasing the opening of the regulating valve 3 restricts the fluid communication between the upper cavity 111 and the lower cavity 112, turning the lower cavity 112 into a refrigerant storage area. This not only reduces energy loss caused by unnecessary gas-liquid separation but also provides a dynamic refrigerant buffer for the air conditioning system, maintaining the stable operation of the evaporator 4, thereby significantly reducing the probability of liquid slugging in the compressor 5, reducing the frequent start-stop of the compressor 5, and improving the energy efficiency of the air conditioning system. This adaptive control method, based on the actual air conditioning system load rate A, achieves flexible adjustment of the gas-liquid separator 100 function through precise control of the opening of the regulating valve 3. It effectively addresses the gas-liquid separation and refrigerant management requirements under different load conditions, and further optimizes the operating performance of the air conditioning system over a wide load range.

[0044] Specifically, the control module of the air conditioning system can collect parameters such as the superheat S at the outlet of the evaporator 4, the refrigerant circulation volume in the air conditioning system, and the actual air conditioning system load rate A in real time.

[0045] Among them, A1=70% and A2=30%.

[0046] like Figure 3 As shown, the air conditioning system control method includes: when A>A1, determining the relationship between the actual operating frequency f of the air conditioning system compressor 5 and the rated operating frequency f1; if f>0.85f1, and the system runs continuously for a certain period of time, the gas-liquid flow rate is large and the separation requirement is high, then controlling the opening of the regulating valve 3 to 100%, and controlling the connection between the liquid inlet of the evaporator 4 and the liquid outlet 14 of the gas-liquid separator 100.

[0047] In this invention, the air conditioning system control method is designed for high-load operation. When the air conditioning system load rate A exceeds a preset threshold A1, the air conditioning system automatically adjusts the opening of the regulating valve 3 to 100%, ensuring complete communication between the liquid inlet of the evaporator 4 and the liquid outlet 14 of the gas-liquid separator 100. This ensures that under high-load conditions, the separated liquid refrigerant can quickly and fully return to the evaporator 4 inlet, ensuring the efficient and stable operation of the air conditioning system. Simultaneously, by precisely controlling the refrigerant flow and distribution, the operating efficiency and safety of the air conditioning system under high-load conditions are further improved, effectively preventing overload of key components and extending the service life of the air conditioning system.

[0048] like Figure 3 As shown, the air conditioning system control method includes: if f≤0.85f1, then control the opening of the regulating valve 3 within the first preset opening range, and control the liquid inlet of the evaporator 4 to disconnect from the liquid outlet 14 of the gas-liquid separator 100; continue to determine the relationship between the liquid level P in the lower cavity 112 and the preset liquid level P1; if P>P1, then control the liquid inlet of the evaporator 4 to connect with the liquid outlet 14 of the gas-liquid separator 100 within the first preset time period; if P≤P1, then return to the steps that started with controlling the opening of the regulating valve 3 within the first preset opening range and controlling the liquid inlet of the evaporator 4 to disconnect from the liquid outlet 14 of the gas-liquid separator 100.

[0049] In this invention, in the air conditioning system control method, when the air conditioning system load rate f is less than or equal to 0.85 times the rated frequency f1, the opening of the regulating valve 3 will be controlled within a first preset opening range. The control valve 8 will be opened to disconnect the liquid inlet of the evaporator 4 from the liquid outlet 14 of the gas-liquid separator 100, preventing unnecessary refrigerant backflow. Next, the liquid level P in the lower cavity 112 will be continuously monitored. If P exceeds the preset liquid level P1, it indicates that a certain amount of refrigerant has accumulated in the lower cavity 112. At this time, the liquid inlet of the evaporator 4 and the liquid outlet 14 of the gas-liquid separator 100 will establish communication within a first preset time period, allowing temporary refrigerant backflow to replenish the liquid refrigerant in the evaporator 4 and maintain its operating efficiency. Once the liquid level P drops below the preset liquid level P1, the air conditioning system will readjust to its initial state, that is, the opening of the regulating valve 3 will be controlled within the first preset opening range, and the control valve 8 will be closed to disconnect the liquid outlet 14 between the evaporator 4 and the gas-liquid separator 100. This closed-loop control strategy, based on feedback from the actual air conditioning system load rate A, the actual operating frequency f of the compressor 5, and the liquid level P in the lower cavity 112, not only adjusts the storage and distribution of refrigerant according to actual needs, but also effectively balances the energy efficiency and stability of the air conditioning system during high-load operation, avoids the risk of insufficient or excessive liquid supply to the evaporator 4, and ensures the safe and reliable operation of the entire air conditioning system, thereby enhancing the overall performance and operating efficiency of the air conditioning system.

[0050] Specifically, the first preset opening range is greater than or equal to 10% and less than or equal to 20%, with P1=80%.

[0051] like Figure 3 As shown, when A1≥A≥A2, the opening of the regulating valve 3 is controlled within the second preset opening range, and the liquid inlet of the evaporator 4 is disconnected from the liquid outlet 14 of the gas-liquid separator 100; the relationship between the liquid level P in the lower cavity 112 and the preset liquid level P1, and the relationship between the superheat S at the outlet of the evaporator 4 of the air conditioning system and the preset superheat S1 are determined; if P>P1 and S<S1, the liquid inlet of the evaporator 4 is connected to the liquid outlet 14 of the gas-liquid separator 100 for a first preset time period, and then the process returns to the step that started with continuing to determine the relationship between the liquid level P in the lower cavity 112 and the preset liquid level P1, and the relationship between the superheat S at the outlet of the evaporator 4 of the air conditioning system and the preset superheat S1; if P≤P1 or S≥S1, the process returns to the step that started with controlling the opening of the regulating valve 3 within the second preset opening range and disconnecting the liquid inlet of the evaporator 4 from the liquid outlet 14 of the gas-liquid separator 100.

[0052] In this invention, when the air conditioning system load A is between A1 and A2, by controlling the opening of the regulating valve 3 within a second preset opening range, the control valve 8 is closed, preventing the liquid refrigerant stored in the lower cavity 112 from being replenished to the evaporator 4, thus ensuring that the function of the gas-liquid separator 100 is adjusted to a state suitable for the current load. At this time, the liquid inlet of the evaporator 4 is disconnected from the liquid outlet 14 of the gas-liquid separator 100, avoiding direct refrigerant backflow and realizing temporary storage of the refrigerant. The liquid level P in the lower cavity 112 of the gas-liquid separator 100 is continuously monitored, and the air conditioning system continuously obtains the evaporator outlet superheat S. If the liquid level P exceeds the preset liquid level P1 and the superheat S is lower than the preset superheat S1, it indicates that the air conditioning system needs more liquid refrigerant to meet the evaporation requirements. Therefore, the opening of regulating valve 3 will be maintained within the second preset opening range, and control valve 8 will be briefly opened for a first preset duration to allow the liquid refrigerant stored in the lower cavity 112 to replenish the evaporator 4. It will then be closed again, and the liquid level P and superheat S will continue to be monitored to ensure stable operation of the air conditioning system. Conversely, if the liquid level P does not exceed P1 or the superheat S is not lower than the preset superheat S1, the current refrigerant supply to the air conditioning system is sufficient and no additional replenishment is needed. In this case, the opening of regulating valve 3 will be maintained within the second preset opening range, keeping the inlet of evaporator 4 disconnected from the outlet of gas-liquid separator 100, avoiding unnecessary refrigerant flow. This achieves dynamic storage and on-demand release of refrigerant in the gas-liquid separator, optimizing the operating efficiency and stability of the air conditioning system under medium load conditions.

[0053] Specifically, the second preset opening range is greater than or equal to 30% and less than or equal to 70%, P1=80% and S1=2℃.

[0054] like Figure 3 As shown, when A < A2, the opening degree of the control valve 3 is controlled within the third preset opening degree range, and the liquid inlet of the evaporator 4 is disconnected from the liquid outlet 14 of the gas-liquid separator 100; the relationship between the liquid level P in the lower cavity 112 and the preset liquid level P1, and the relationship between the superheat S at the outlet of the evaporator 4 of the air conditioning system and the preset superheat S1 are determined; if P > P1 and S < S1, the liquid inlet of the evaporator 4 is connected to the liquid outlet 14 of the gas-liquid separator 100 for a first preset time period, and then the process returns to the step that started by continuing to determine the relationship between the liquid level P in the lower cavity 112 and the preset liquid level P1, and the relationship between the superheat S at the outlet of the evaporator 4 of the air conditioning system and the preset superheat S1; if P ≤ P1 or S ≥ S1, the process returns to the step that started by controlling the opening degree of the control valve 3 within the second preset opening degree range and disconnecting the liquid inlet of the evaporator 4 from the liquid outlet 14 of the gas-liquid separator 100.

[0055] In this invention, when the air conditioning system determines that A is less than A2, the opening of the control valve 3 is maintained within a third preset opening range, and the control valve 8 is closed to disconnect the connection between the liquid inlet of the evaporator 4 and the liquid outlet 14 of the gas-liquid separator 100. The system continues to determine the relationship between the liquid level P in the lower cavity 112 and the preset liquid level P1, as well as the relationship between the superheat S at the outlet of the evaporator 4 and the preset superheat S1. Once P is detected to be greater than P1 and S less than S1, the air conditioning system immediately adjusts, and the control valve 8 is opened for a first preset time to establish communication between the liquid inlet of the evaporator 4 and the liquid outlet 14 of the gas-liquid separator 100 within the first preset time, so as to replenish refrigerant to the evaporator 4 in a timely manner. Subsequently, the control valve 8 is closed, and the air conditioning system returns to the state of monitoring the liquid level P and the superheat S. Conversely, if the liquid level P does not exceed P1 or the superheat S is not lower than S1, the air conditioning system will automatically return to maintaining the opening of the control valve 3 within the third preset opening range, and the control valve 8 will close to disconnect the connection between the liquid inlet of the evaporator 4 and the liquid outlet 14 of the gas-liquid separator 100, thereby avoiding unnecessary refrigerant supply and optimizing the operating efficiency and stability of the entire air conditioning system. This dynamic control strategy based on the operating conditions of the air conditioning system effectively balances the gas-liquid separation and storage of the refrigerant, ensuring that the air conditioning system can intelligently adjust the refrigerant flow under low load conditions, avoiding compressor liquid slugging, while improving the liquid supply accuracy of the evaporator 4 and enhancing the overall performance of the air conditioning system.

[0056] Specifically, the third preset opening range is greater than or equal to 5% and less than or equal to 20%, P1=80% and S1=2℃.

[0057] like Figure 5 As shown, before the air conditioning system starts, or before the compressor 5 stops, or when the air conditioning system suddenly loses power or recovers from a fault, the opening of the regulating valve 3 needs to be adjusted to 5%, and the control valve 8 needs to be closed. This allows the liquid refrigerant to slowly move down to the lower cavity 112 under gravity through the regulating valve 3. The lower cavity 112 absorbs transient shocks by the rise in liquid level and the compression of the gas phase space. During the air conditioning system startup phase, the control module confirms the compressor 5 startup signal. When the air conditioning system self-test passes and the liquid level P in the lower cavity 112 is ≤ 90... When the liquid level is 95%, the control valve 8 is opened in stages: from 0s to 10s, the opening of the control valve 8 reaches 10%; from 10s to 30s, the opening of the control valve 8 reaches 30%; from 30s to 60s, the opening of the control valve 8 reaches 60%; and after 60s, the control valve 8 is adjusted according to the liquid level P and the superheat S. If the liquid level P in the lower cavity 112 is greater than 95% or an abnormal pressure occurs in the lower cavity 112 during the opening of the control valve 8, the air conditioning system will completely close the control valve 8 and trigger the protection mechanism to prevent liquid slugging.

[0058] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects: The gas-liquid separator 100 of the present invention includes: a housing 1 having a receiving cavity 11 and a gas-liquid inlet 12, a gas outlet 13, and a liquid outlet 14 respectively communicating with the receiving cavity 11; a partition plate 2 disposed within the receiving cavity 11 to divide the receiving cavity 11 into an upper cavity 111 and a lower cavity 112, the upper cavity 111 communicating with the gas-liquid inlet 12 and the gas outlet 13 respectively, and the lower cavity 112 communicating with the liquid outlet 14; the partition plate 2 is provided with a first connecting hole for connecting the upper cavity 111 and the lower cavity 112; and a regulating valve 3 disposed within the first connecting hole, i.e., between the upper cavity 111 and the lower cavity 112, the regulating valve 3 supporting continuous opening adjustment from 0% to 100%, so as to adjust the flow area of ​​the connecting hole by controlling the opening of the regulating valve 3, thereby adjusting the communication state between the upper cavity 111 and the lower cavity 112. The gas-liquid separator 100 of the present invention achieves effective control of the flow area of ​​the first connecting hole by providing a first connecting hole on the partition plate 2 of the housing 1 and installing a regulating valve 3 in the first connecting hole, thus solving the problem that the function of the gas-liquid separator 100 in the prior art cannot be dynamically adjusted according to load changes. When the air conditioning system is running under high load, the opening of the regulating valve 3 increases, which can improve the gas-liquid flow efficiency between the upper cavity 111 and the lower cavity 112, thereby improving the gas-liquid separation efficiency, ensuring that the refrigerant flowing out from the gas outlet 13 is pure gas, reducing the risk of liquid slugging in the compressor 5, and enhancing the stability of the air conditioning system. When the air conditioning system is running under low load, the opening of the regulating valve 3 decreases, or even approaches closure, to convert the lower cavity 112 into a temporary storage area for liquid refrigerant. This not only effectively absorbs and controls the liquid refrigerant at the outlet of the evaporator 4, avoiding refrigerant waste caused by excessive separation capacity, but also provides a dynamic refrigerant buffer for the air conditioning system, reducing the fluctuation of the evaporator 4, reducing the risk of liquid slugging in the compressor 5, and improving the energy efficiency and operational stability of the air conditioning system. This gas-liquid separator 100, which is based on the load adaptive adjustment of the air conditioning system, realizes the automatic switching of the function of the gas-liquid separator 100 by finely adjusting the opening of the regulating valve 3. It effectively solves the contradiction between the working efficiency and stability of the gas-liquid separator 100 under different loads and significantly improves the operating performance of the air conditioning system in a wide load range.

[0059] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0060] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0061] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0062] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0063] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0064] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A gas-liquid separator characterized by, The gas-liquid separator comprises: a shell (1) having a containing cavity (11) and a gas-liquid inlet (12), a gas outlet (13) and a liquid outlet (14) respectively communicating with the containing cavity (11); a partition plate (2) arranged in the containing cavity (11) to divide the containing cavity (11) into an upper cavity (111) and a lower cavity (112), the upper cavity (111) communicating with the gas-liquid inlet (12) and the gas outlet (13) respectively, and the lower cavity (112) communicating with the liquid outlet (14); the partition plate (2) is provided with a first communication hole for communicating the upper cavity (111) and the lower cavity (112); an adjusting valve (3) arranged in the first communication hole to adjust the flow area of the communication hole by controlling the opening degree of the adjusting valve (3).

2. The gas-liquid separator of claim 1, wherein, The gas-liquid separator further comprises a liquid trapping net (113) arranged in the upper cavity (111) below the gas-liquid inlet (12) and the gas outlet (13) to divide the upper cavity (111) into a first cavity section (114) and a second cavity section (115) arranged in sequence from top to bottom; wherein, the liquid trapping net (113) is provided with a second communication hole, the upper end of the second communication hole communicating with the gas-liquid inlet (12), and the lower end of the second communication hole communicating with the second cavity section (115); the liquid trapping net (113) is arranged in a spaced manner with the gas outlet (13).

3. The gas-liquid separator of claim 2, wherein, The gas-liquid separator comprises a gas-liquid inflow pipe (121), the inlet of the gas-liquid inflow pipe (121) being used for connecting with the outlet of an evaporator (4) of an air conditioning system, and the outlet of the gas-liquid inflow pipe (121) being inserted into the upper cavity (111) through the gas-liquid inlet (12) and connected with the second communication hole.

4. The gas-liquid separator of claim 2, wherein, The gas-liquid separator comprises: a flow guide channel (116) arranged in the second cavity section (115) and extending along a predetermined trajectory, the upper end of the flow guide channel (116) communicating with the lower end of the second communication hole; a flow guide plate (117) arranged in the second cavity section (115) below the flow guide channel (116), one end of the flow guide plate (117) being connected with the shell (1), and the other end of the flow guide plate (117) being arranged towards the first communication hole; wherein the lower end of the flow guide channel (116) is arranged towards the upper surface of the flow guide plate (117).

5. The gas-liquid separator of claim 4, wherein, The predetermined trajectory is a spiral line.

6. The gas-liquid separator of claim 1, wherein, The gas-liquid separator comprises: a liquid level detection component (6), at least a part of the liquid level detection component (6) being arranged in the lower cavity (112) and connected with a control module of an air conditioning system to detect the liquid level of the liquid in the lower cavity (112) and transmit the detection result to the control module; A control valve (8) is arranged at the liquid outlet (14) and connected with a control module of the air conditioning system, and the control module controls the opening degree of the control valve (8) according to the detection result of the liquid level detection component (6).

7. The gas-liquid separator of claim 1, wherein, The gas-liquid separator comprises: A gas-liquid inflow pipe (121), an inlet of which is connected with an outlet of an evaporator (4) of the air conditioning system, and an outlet of which is inserted into the upper cavity (111) through the gas-liquid inlet (12); and / or, A gas outflow pipe (131), an inlet of which is inserted into the upper cavity (111) through the gas outlet (13), and an outlet of which is connected with a gas inlet of a compressor (5) of the air conditioning system; and / or, A liquid outflow pipe (141), an inlet of which is inserted into the lower cavity (112) through the liquid outlet (14), and an outlet of which is connected with a liquid inlet of the evaporator (4) of the air conditioning system.

8. An air conditioning system characterized by, The air conditioning system comprises: The evaporator (4) is connected with the gas-liquid inlet (12) of the gas-liquid separator, and a liquid inlet of the evaporator (4) is connected with the liquid outlet (14) of the gas-liquid separator; The compressor (5) is connected with the gas outlet (13) of the gas-liquid separator; A control module is connected with the adjusting valve (3) of the gas-liquid separator to control the opening degree of the adjusting valve (3) according to an actual air conditioning system load rate A of the air conditioning system.

9. An air conditioning system control method characterized by, The air conditioning system control method comprises: When the air conditioning system is running, an actual air conditioning system load rate A of the air conditioning system is obtained; The size relationship between the actual air conditioning system load rate A and first and second preset load rates A1 and A2 is judged; The opening degree of the adjusting valve (3) is controlled according to the judgment result; The first preset load rate A1 is greater than the second preset load rate A2.

10. The air conditioning system control method of claim 9, wherein, The air conditioning system control method comprises: When A>A1, the size relationship between an actual running frequency f of the compressor (5) of the air conditioning system and a rated running frequency f1 is judged; If f>0.85f1, the opening degree of the adjusting valve (3) is controlled to be 100%, and the liquid inlet of the evaporator (4) is controlled to be communicated with the liquid outlet (14) of the gas-liquid separator.

11. The air conditioning system control method of claim 10, wherein, The air conditioning system control method comprises: If f≤0.85f1, the opening degree of the adjusting valve (3) is controlled to be within a first preset opening degree range, and the liquid inlet of the evaporator (4) is controlled to be disconnected with the liquid outlet (14) of the gas-liquid separator; The size relationship between the liquid level P of the liquid in the lower cavity (112) and a preset liquid level P1 is continuously judged; If P>P1, then the liquid inlet of the evaporator (4) is connected to the liquid outlet (14) of the gas-liquid separator for a first preset time period; If P≤P1, then the step of controlling the opening of the regulating valve (3) in the first preset opening range and disconnecting the liquid inlet of the evaporator (4) from the liquid outlet (14) of the gas-liquid separator is repeated.

12. The air conditioning system control method according to claim 9, wherein If A1≥A≥A2, the opening of the regulating valve (3) is controlled in the second preset opening range and the liquid inlet of the evaporator (4) is disconnected from the liquid outlet (14) of the gas-liquid separator; The relationship between the liquid level P of the liquid in the lower cavity (112) and the preset liquid level P1 and the relationship between the superheat S at the outlet of the evaporator (4) of the air conditioning system and the preset superheat S1 are continuously determined; If P>P1 and S<S1, the liquid inlet of the evaporator (4) is connected to the liquid outlet (14) of the gas-liquid separator for a first preset time period, and then the step of continuously determining the relationship between the liquid level P of the liquid in the lower cavity (112) and the preset liquid level P1 and the relationship between the superheat S at the outlet of the evaporator (4) of the air conditioning system and the preset superheat S1 is repeated; If P≤P1 or S≥S1, the step of controlling the opening of the regulating valve (3) in the second preset opening range and disconnecting the liquid inlet of the evaporator (4) from the liquid outlet (14) of the gas-liquid separator is repeated.

13. The air conditioning system control method according to claim 9, wherein If A<A2, the opening of the regulating valve (3) is controlled in the third preset opening range and the liquid inlet of the evaporator (4) is disconnected from the liquid outlet (14) of the gas-liquid separator; The relationship between the liquid level P of the liquid in the lower cavity (112) and the preset liquid level P1 and the relationship between the superheat S at the outlet of the evaporator (4) of the air conditioning system and the preset superheat S1 are continuously determined; If P>P1 and S<S1, the liquid inlet of the evaporator (4) is connected to the liquid outlet (14) of the gas-liquid separator for a first preset time period, and then the step of continuously determining the relationship between the liquid level P of the liquid in the lower cavity (112) and the preset liquid level P1 and the relationship between the superheat S at the outlet of the evaporator (4) of the air conditioning system and the preset superheat S1 is repeated; If P≤P1 or S≥S1, the step of controlling the opening of the regulating valve (3) in the second preset opening range and disconnecting the liquid inlet of the evaporator (4) from the liquid outlet (14) of the gas-liquid separator is repeated.

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