Supercooling structure and air conditioning system

Abstract

The supercooling structure comprises a gas-liquid separator and a supercooling device, the gas-liquid separator comprises a shell and a backflow pipe, the shell is provided with a containing cavity, a liquid inlet, a liquid outlet, an air inlet and an air outlet, the liquid inlet, the liquid outlet, the air inlet and the air outlet communicate with the containing cavity, the containing cavity comprises a refrigerant area and a refrigerant oil area, the liquid inlet is connected with a throttling device, and the refrigerant oil area is connected with the backflow pipe. The liquid outlet is located in the refrigerant area and connected with the input end of the evaporator, the air inlet can be used for being connected with the output end of the evaporator, the air outlet communicates with the containing cavity through a return pipe and can be used for being connected with the air suction end of the compressor, and the return pipe is provided with an oil return hole located in the refrigerant oil area. The supercooling device is located between the output end of the condenser and the input end of the throttling device and communicates with the liquid inlet through a liquid inlet pipe, and the air outlet pipe communicates with the air inlet. The conditions that refrigeration oil flows to the evaporator to affect the heat exchange effect of the evaporator and fluctuation of evaporation pressure in the gas-liquid separator to affect the refrigeration effect are reduced, and the energy efficiency of the air conditioning system is improved.

Description

Technical Field

[0001] The present application relates to the technical field of air-conditioning units, and in particular to a supercooling structure and an air-conditioning system. Background Art

[0002] With the development of society, air conditioners are becoming more and more popular in our lives. Whether at home or on the road, air conditioners are important equipment to provide a comfortable environment. Therefore, air conditioners are becoming more and more indispensable equipment in our lives. Air conditioners consume huge amounts of electricity when running for a long time. Therefore, high energy efficiency of air conditioners is our constant pursuit.

[0003] In the process of implementing this application, the inventors found that there are at least the following technical problems in the prior art: When the air conditioner has been running for a long time or encounters harsh working conditions, various reliability-related problems may occur in the air conditioning system. Among them, lack of oil in the compressor is also a problem that may occur when encountering harsh working conditions. In the existing air conditioning system, as the unit is running, the lubricating oil of the compressor will flow throughout the entire system. If the lubricating oil adheres to the inside of the indoor heat exchanger to form an oil film, it will seriously affect the heat exchange effect on the indoor side, resulting in unsatisfactory cooling effect, thereby reducing the energy efficiency of the entire air conditioning system. Summary of the invention

[0004] In order to overcome the problems existing in the above-mentioned prior art, the main purpose of the present application is to provide a supercooling structure and an air-conditioning system that can improve energy efficiency.

[0005] In order to achieve the above objectives, this application specifically adopts the following technical solutions: A supercooling structure is applied to an air conditioning system, wherein the air conditioning system comprises a compressor, a condenser, a throttling device and an evaporator connected in sequence, and the supercooling structure comprises: A gas-liquid separator, the gas-liquid separator comprises a shell and a return pipe, the shell is provided with a accommodating chamber and a liquid inlet, a liquid outlet, an air inlet and an air outlet respectively connected with the accommodating chamber, the accommodating chamber comprises a refrigerant area for accommodating refrigerant and a refrigerating oil area for accommodating refrigerating oil, the liquid inlet can be used to connect with the output end of the throttling device, the liquid outlet is located in the refrigerant area and can be used to connect with the input end of the evaporator, the air inlet can be used to connect with the output end of the evaporator, the air outlet is connected with the accommodating chamber via the return pipe, and the air outlet can be used to connect with the suction end of the compressor, the return pipe is provided with an oil return hole, and the oil return hole is located in the refrigerating oil area; A subcooling device is located between the output end of the condenser and the input end of the throttling device, and is used to subcool the fluid output from the condenser; the subcooling device is connected to the liquid inlet through a liquid inlet pipe, and the subcooling device is connected to the air inlet through an air outlet pipe.

[0006] In some embodiments, the subcooling device also includes a sleeve, which is sleeved on the pipeline between the output end of the condenser and the input end of the throttling device, and is enclosed with the pipeline to form a cavity. The sleeve is provided with a sleeve liquid inlet and a sleeve air outlet. The cavity is connected with the liquid inlet pipe through the sleeve liquid inlet, and the cavity is connected with the air outlet pipe through the sleeve air outlet.

[0007] In some embodiments, the first end of the reflux pipe is located in the accommodating cavity and is connected to the air inlet through the accommodating cavity. The second end of the reflux pipe can be used to communicate with the air outlet. Along the height direction of the shell, the height of the first end is higher than the height of the liquid level in the accommodating cavity, and the height of the first end is lower than the height of the air inlet.

[0008] In some embodiments, when the density of the refrigerant is greater than the density of the refrigeration oil, the refrigeration oil area is located above the refrigerant area, the vertical distance between the liquid surface of the refrigeration oil and the liquid surface of the refrigerant is H1, the vertical distance between the oil return hole and the liquid surface of the refrigeration oil is h1, 1 / 3H1≤h1≤1 / 2H1; When the density of the refrigerating oil is greater than the density of the refrigerant, the refrigerating oil zone is located below the refrigerant zone, the vertical distance between the liquid level of the refrigerating oil and the bottom of the accommodating chamber is H2, the vertical distance between the oil return hole and the bottom of the accommodating chamber is h2, 1 / 3H2≤h2≤1 / 2H2. In some embodiments, the gas-liquid separator further includes a connecting pipe, the liquid inlet is connected to the accommodating cavity via the connecting pipe, and the shell is further provided with an outlet, the liquid inlet pipe is connected to the connecting pipe via the outlet.

[0009] In some embodiments, in the height direction of the shell, the height of the liquid inlet is higher than the height of the outlet.

[0010] In some embodiments, an end of the connecting pipe away from the liquid inlet is located where the refrigerant and the refrigeration oil are separated into layers.

[0011] In some embodiments, the supercooling structure further includes a refrigerant pump, an input end of the refrigerant pump is connected to the liquid outlet, and an output end of the refrigerant pump can be used to connect to an input end of the evaporator.

[0012] In some embodiments, the supercooling structure further includes a drying filter, the input end of the drying filter can be used to connect to the output end of the condenser, and the output end of the drying filter can be used to connect to the input end of the throttling device.

[0013] An air conditioning system comprises the supercooling structure described in any one of the above items and a compressor, a condenser, a throttling device and an evaporator connected in sequence.

[0014] Compared with the prior art, the supercooling structure and air conditioning system provided by the present application have at least the following beneficial effects: The air-conditioning system applies the supercooling structure provided by the present application. The normal temperature and high pressure refrigerant liquid coming out of the condenser is throttled into a low temperature and low pressure refrigerant liquid before entering the evaporator, and enters the gas-liquid separator. Since the refrigerant and the refrigeration oil will be stratified at low temperatures, a refrigerant area and a refrigeration oil area are formed in the gas-liquid separator. The liquid outlet is located in the refrigerant area and connected to the input end of the evaporator. The oil return hole is located in the refrigeration oil area, so that the refrigeration oil can directly return to the compressor, shortening the circulation path of the refrigeration oil in the air-conditioning system and reducing the situation where the refrigeration oil flows to the evaporator and affects the heat exchange effect of the evaporator. , effectively ensuring the stability of the operation of the air-conditioning system, and the supercooling device of the present application is located between the output end of the condenser and the input end of the throttling device, for supercooling the fluid output from the condenser, reducing the refrigerant gas output from the output end of the condenser affecting the liquid inlet amount of the throttling device, and reducing the high-pressure refrigerant gas output from the output end of the condenser being condensed into high-pressure refrigerant liquid in the gas-liquid separator, thereby causing fluctuations in evaporation pressure to affect the refrigeration effect, increasing the unit cooling capacity of the refrigerant, thereby improving the overall energy efficiency of the air-conditioning system, and also improving the stability of the air-conditioning system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of an air conditioning system provided in an embodiment of the present application; Figure 2 A schematic diagram of the structure of a gas-liquid separator for an air-conditioning system provided in an embodiment of the present application; Figure 3 A schematic structural diagram of another state of the gas-liquid separator of the air-conditioning system provided in an embodiment of the present application.

[0016] Reference numerals: 1. Refrigeration circuit; 101. Compressor; 102. Condenser; 103. Throttling device; 104. Evaporator; 105. Pipeline; 2. Subcooling device; 31. Gas-liquid separator; 310. Shell; 311. Accommodating chamber; 312. Liquid inlet; 313. Liquid outlet; 314. Air inlet; 315. Air outlet; 316. Refrigerant area; 317. Refrigeration oil area; 32. Return pipe; 320. Oil return hole; 4. Condensing fan; 5. Ventilator; 6. Connecting pipe; 7. Liquid inlet pipe; 8. Exhaust pipe; 9. Refrigerant pump; 10. Dry filter; 11. Sight glass; 12. Check valve; 13. Temperature sensor; 14. High voltage switch; 15. High pressure sensor; 16. Low pressure sensor; 17. Low voltage switch. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0018] In the description of this application, unless otherwise clearly specified and limited, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; unless otherwise specified or explained, the term "multiple" refers to two or more, and the term "multiple" refers to two or more; the terms "connected", "fixed", etc. should be understood in a broad sense, for example, "connected" can be a fixed connection, a detachable connection, an integral connection, or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0019] In the description of this specification, it should be understood that the directional words such as "upper" and "lower" described in the embodiments of the present application are described at the angles shown in the accompanying drawings and should not be understood as limiting the embodiments of the present application. In addition, in the context, it should also be understood that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to another element "upper" or "lower", but also indirectly connected to another element "upper" or "lower" through an intermediate element.

[0020] Reference Figure 1 and Figure 2 As shown, Figure 1 The schematic diagram of the air conditioning system provided in the embodiment of the present application is as follows: Figure 2 A schematic diagram of the structure of a gas-liquid separator of an air-conditioning system provided in an embodiment of the present application. This embodiment discloses an air-conditioning system, which includes a refrigeration circuit 1 and a supercooling structure, wherein the refrigeration circuit 1 includes a compressor 101, a condenser 102, a throttling device 103, and an evaporator 104 connected in sequence through a pipeline 105.

[0021] The supercooling structure includes a gas-liquid separator 31 and a supercooling device 2. The gas-liquid separator 31 includes a shell 310 and a return pipe 32. The shell 310 is provided with a receiving chamber 311 and a liquid inlet 312, a liquid outlet 313, an air inlet 314 and an air outlet 315 respectively connected to the receiving chamber 311. The receiving chamber 311 includes a refrigerant area 316 for accommodating refrigerant (more specifically, liquid refrigerant) and a refrigeration oil area 317 for accommodating refrigeration oil. It can be understood that the receiving chamber 311 can accommodate gaseous refrigerant, liquid refrigerant and refrigeration oil, so that the receiving chamber 311 can be divided into a gaseous area for accommodating gaseous refrigerant and a liquid area for accommodating liquid refrigerant and refrigeration oil (the liquid area includes the refrigerant area 316 and the refrigeration oil area 317). The liquid inlet 312 can be used to connect to the output end of the throttling device 103. The liquid outlet 313 is located in the refrigerant area 316 and can be used to connect with the input end of the evaporator 104. It is understood that the liquid outlet 313 is usually located in the lower area of ​​the shell 310, which more effectively ensures that the refrigerant discharged from the liquid outlet 313 is all low-temperature and low-pressure liquid refrigerant. The air inlet 314 can be used to connect with the output end of the evaporator 104. The air outlet 315 is connected to the accommodating chamber 311 through the return pipe 32, and the air outlet 315 can be used to connect with the suction end of the compressor 101. It is understood that the air outlet 315 is connected to the gaseous area of ​​the accommodating chamber 311 through the return pipe 32, so that the gaseous refrigerant in the gaseous area of ​​the accommodating chamber 311 can flow back to the compressor 101 via the return pipe 32 and the air outlet 315. The return pipe 32 is a U-shaped pipe, and an oil return hole 320 is provided at the bottom of the return pipe 32 (or the oil return hole 320 is provided at the lowest position of the return pipe 32), and the oil return hole 320 is located in the refrigeration oil area 317. The subcooling device 2 is located between the output end of the condenser 102 and the input end of the throttling device 103, and is used to subcool the fluid output from the condenser 102; the subcooling device 2 is connected with the liquid inlet 312 through the liquid inlet pipe 7, and a part of the throttled refrigerant liquid entering from the liquid inlet 312 enters the subcooling device 2 through the liquid inlet pipe 7 to provide a cooling medium for the subcooling device 2, thereby ensuring the normal operation of the subcooling device 2. The subcooling device 2 is connected with the air inlet 314 through the air outlet pipe 8, and the refrigerant gas evaporated in the subcooling device 2 will return to the accommodating chamber 311 from the air inlet 314 along the air outlet pipe 8 and enter the next round of compression.

[0022] Among them, the throttling device 103 can be set as an electronic expansion valve or a thermal expansion valve, so that the opening of the throttling device 103 can be regulated by a control system, and the regulation basis can be comprehensive factors such as the temperature of the refrigerant flowing out of the shell 310.

[0023] In this embodiment, the air conditioning system further includes a condensing fan 4 and a ventilator 5 (also referred to as an evaporating fan or a blower). The condensing fan 4 is disposed on one side of the condenser 102 and is used to transfer the heat released by the refrigerant in the condenser 102 to the surrounding air to ensure efficient operation of the air conditioning system. The ventilator 5 is disposed on one side of the evaporator 104. The ventilator 5 drives the impeller to rotate through the wind wheel to generate airflow, so that the indoor air and the evaporator 104 are forced to perform convection heat exchange to ensure efficient operation of the air conditioning system.

[0024] It should be noted that the size of the oil return hole 320 can be set as required to ensure that the compressor 101 can operate without oil shortage.

[0025] The present embodiment is provided with a gas-liquid separator 31. The normal temperature and high pressure refrigerant liquid condensed by the condenser 102 is throttled into a low temperature and low pressure refrigerant liquid before entering the evaporator 104. Since the refrigerant and the refrigeration oil will be stratified at low temperature (relative to normal temperature), a refrigerant area 316 and a refrigeration oil area 317 are formed in the gas-liquid separator 31. The liquid outlet 313 is located in the refrigerant area 316 and connected to the input end of the evaporator 104. The oil return hole 320 is located in the refrigeration oil area 317, so that the refrigeration oil can be directly returned to the compressor 101, shortening the circulation path of the refrigeration oil in the air-conditioning system and reducing the refrigeration oil flowing to the evaporator 104 and affecting the evaporation. The heat exchange effect of the condenser 104 is improved, which effectively ensures the stability of the operation of the air-conditioning system. The supercooling device 2 of this embodiment is located between the output end of the condenser 102 and the input end of the throttling device 103, and is used to supercool the fluid output from the condenser 102, thereby reducing the refrigerant gas output from the output end of the condenser 102 affecting the liquid inlet amount of the throttling device 103 and reducing the high-pressure refrigerant gas output from the output end of the condenser 102. The condensation of the evaporation pressure fluctuation into a high-pressure refrigerant liquid in the gas-liquid separator 31 affects the refrigeration effect, thereby increasing the unit cooling capacity of the refrigerant, thereby improving the overall energy efficiency of the air-conditioning system, and also improving the stability of the air-conditioning system.

[0026] Reference Figure 2As shown, the supercooling device 2 includes a sleeve, which is sleeved on the pipeline 105 between the output end of the condenser 102 and the input end of the throttling device 103, and is enclosed with the pipeline 105 to form a cavity, and the sleeve is provided with a sleeve liquid inlet and a sleeve gas outlet, the cavity is connected to the liquid inlet pipe 7 through the sleeve liquid inlet, and the cavity is connected to the gas outlet pipe 8 through the sleeve gas outlet. In other embodiments, the supercooling device can also use a plate heat exchanger to supercool the fluid output from the condenser 102 in the pipeline 105.

[0027] Reference Figure 2 As shown, the first end of the return pipe 32 is suspended in the accommodating chamber 311 and communicated with the air inlet 314 through the accommodating chamber 311, and the second end of the return pipe 32 can be used to communicate with the air outlet 315. Along the height direction of the shell 310, the height of the first end is higher than the height of the liquid level in the accommodating chamber 311, and the height of the first end is lower than the height of the air inlet 314, so that the gaseous fluid entering the accommodating chamber 311 from the air inlet 314 can be discharged from the first end of the return pipe 32 through the return pipe 32 and from the second end of the return pipe 32.

[0028] Reference Figure 2 As shown, the density of the refrigerant is greater than the density of the refrigerating oil, the refrigerating oil area 317 is located above the refrigerant area 316, the vertical distance between the liquid level of the refrigerating oil and the liquid level of the refrigerant is H1, the vertical distance between the return oil hole 320 and the liquid level of the refrigerating oil is h1, 1 / 3H1≤h1≤1 / 2H1, to ensure that the return oil hole 320 is located in the refrigerating oil area 317, so that when the compressor 101 is running, the required refrigerating oil can be returned more promptly, reducing the situation where the compressor 101 is short of oil due to oil return difficulties, and reducing the situation where the liquid refrigerant is sucked into the compressor 101 to cause liquid hammer and cause damage to the compressor 101, thereby improving the stability of the air-conditioning system operation.

[0029] It should be noted that the gas-liquid separator 31 of the present application can relatively increase a little refrigeration oil, which will be more conducive to the oil return of the compressor 101 without affecting the heat exchange effect of the evaporator 104, but the present application will have no effect without additional refrigeration oil. Reference Figure 3 As shown, Figure 3 A schematic diagram of the structure of another state of the gas-liquid separator of the air-conditioning system provided in the embodiment of the present application. When the density of the refrigerating oil is greater than the density of the refrigerant, the refrigerating oil area 317 is located below the refrigerant area 316, the vertical distance between the liquid surface of the refrigerating oil and the bottom of the accommodating chamber 311 is H2, the vertical distance between the return oil hole 320 and the bottom of the accommodating chamber 311 is h2, 1 / 3H2≤h2≤1 / 2H2, to ensure that the return oil hole 320 is located in the refrigerating oil area 317, the effect is as described above, and no further description is given here, at this time, the liquid outlet 313 is located on the side of the shell 310.

[0030] Reference Figure 2 As shown, the air conditioning system further includes a connecting pipe 6, through which the liquid inlet 312 is connected to the accommodating chamber 311, and the shell 310 is also provided with an outlet, through which the liquid inlet pipe 7 is connected to the connecting pipe 6. It can be understood that the connecting pipe 6 is respectively connected to the liquid inlet 312, the outlet, and the accommodating chamber 311, so that the low-temperature and low-pressure liquid refrigerant flowing out from the output end of the throttling device 103 can be divided into two paths: the first path flows into the accommodating chamber 311 through the connecting pipe 6; the second path flows into the cavity of the sleeve through the connecting pipe 6, the outlet, the liquid inlet pipe 7, and the sleeve inlet, so that the fluid output from the condenser 102 can be supercooled. The end of the connecting pipe 6 away from the liquid inlet 312 is located at the stratification of the refrigerant and the refrigeration oil, so as to reduce the impact force formed by the liquid flowing from the connecting pipe 6 into the accommodating chamber 311, thereby reducing noise, so that the air conditioning system can be applied to a comfortable and quiet environment, and the applicability of the air conditioning system is improved.

[0031] In this embodiment, in the height direction of the shell 310, the height of the liquid inlet 312 is higher than the height of the outlet, so that part of the refrigerant liquid after throttling entering from the liquid inlet 312 can enter the subcooling device 2 from the outlet through the liquid inlet pipe 7 by gravity, thereby ensuring the normal operation of the subcooling device 2.

[0032] Reference Figure 2 As shown, the supercooling structure also includes a refrigerant pump 9 and a drying filter 10. The input end of the refrigerant pump 9 is connected to the liquid outlet 313 of the gas-liquid separator 31 through a pipeline 105, and the output end of the refrigerant pump 9 can be used to connect to the input end of the evaporator 104 through the pipeline 105 to drive the refrigerant in the refrigerant area 316 to flow into the evaporator 104. The input end of the drying filter 10 can be used to connect to the output end of the condenser 102, and the output end of the drying filter 10 can be used to connect to the input end of the throttling device 103 to remove impurities in the refrigerant and prevent the occurrence of dirty blockage. The gas-liquid separator 31 also includes a sight glass 11, which is connected to the shell 310 and is used to observe the liquid level of the liquid in the accommodating chamber 311, which is conducive to timely discovery and resolution of problems to ensure efficient and stable operation of the air-conditioning system. In a specific application, in the height direction of the gas-liquid separator 31, the height of the pipeline connected to the liquid outlet 313 can also be made lower than the height of the liquid outlet 313, and along the flow direction of the fluid in the pipeline, the height of the pipeline gradually becomes lower, so that the refrigerant flows from the liquid outlet 313 to the evaporator 104 by gravity, and there is no need to set up a refrigerant pump 9, thereby reducing costs.

[0033] It should be noted that this application is discussed for an integrated air conditioner, so the head and power of the refrigerant pump 9 are small, and even the increased initial cost will not be too much, and the entire air-conditioning system will not increase excessive power due to the introduction of the refrigerant pump 9.

[0034] Reference Figure 1 As shown, the air conditioning system further includes a one-way valve 12, a temperature sensor 13, a high pressure switch 14, a high pressure sensor 15, a low pressure sensor 16, a low pressure switch 17 and a controller. The one-way valve 12 is arranged at the exhaust end of the compressor 101 to prevent the medium in the air conditioning system from backflowing when the compressor is shut down or the pressure changes, thereby ensuring the normal operation of the compressor 101. Two temperature sensors 13 are provided, and the two temperature sensors 13 are respectively arranged at the exhaust end of the compressor 101 and the output end of the evaporator 104 to monitor the temperature of the compressor 101 and the evaporator 104 in real time, thereby ensuring that the air conditioning system operates within a safe range. The high pressure switch 14 is arranged at the exhaust end of the compressor 101, and is used to stop the operation of the compressor 101 when the pressure in the pipeline 105 reaches the set high pressure of the high pressure switch 14, so as to prevent the compressor 101 from being damaged due to excessive exhaust pressure of the compressor 101. The high-pressure sensor 15 is arranged at the exhaust end of the compressor 101 and connected to the controller. The high-pressure sensor 15 is used to detect the pressure in the pipeline 105 at the exhaust end of the compressor 101, and feed back the detection result to the controller, so that when the system pressure is higher than the preset value, the compressor 101 is stopped by the controller to prevent the compressor 101 from being damaged due to excessive pressure in the pipeline 105. The low-pressure sensor 16 is arranged at the input end of the air inlet 314 and connected to the controller, and is used to monitor the pressure of the air inlet pipeline 105 of the gas-liquid separator 31, and feed back the detection result to the controller, so that when the system pressure is lower than the preset value, the compressor 101 is stopped by the controller to ensure the normal operation of the air-conditioning system. The low-pressure switch 17 is arranged at the air intake end of the compressor 101, and is used to monitor the low-pressure state of the air-conditioning system, and prevent the compressor 101 from continuing to operate under the low-pressure state, thereby protecting the compressor 101 from being damaged.

[0035] In a specific application scenario, during operation, the refrigerant is compressed by the compressor 101 into high-temperature and high-pressure refrigerant vapor, and then enters the condenser 102 through the exhaust end of the compressor 101. After heat exchange and condensation in the condenser 102, it becomes a high-pressure refrigerant liquid at room temperature. The high-pressure refrigerant liquid output from the output end of the condenser 102 passes through the subcooling device 2, the drying filter 10 and the throttling device 103 in turn to be throttled into a low-temperature and low-pressure refrigerant liquid. A small part of the low-temperature and low-pressure refrigerant liquid will enter the subcooling device 2 from the liquid inlet 312 through the liquid inlet pipe 7, and most of the other refrigerant liquid will enter the gas-liquid separator 3 through the connecting pipe 6. 1 and is stratified in the gas-liquid separator 31 to form a refrigerant area 316 and a refrigeration oil area 317. The refrigerant in the refrigerant area 316 (pure refrigerant without refrigeration oil or only a very small amount of refrigeration oil) will be sent to the evaporator 104 for evaporation and heat exchange through the liquid outlet 313 under the action of the refrigerant pump 9. The refrigerant gas output from the output end of the evaporator 104 returns to the gas-liquid separator 31 from the air inlet 314 in a low-temperature and low-pressure state. After the low-temperature and low-pressure refrigerant gas enters the gas-liquid separator 31, it passes through the oil return hole 320 under the rated action. The refrigeration oil will return to the compressor 101 from the air outlet 315 together with the refrigerant, thereby completing a compression cycle. The above is only a preferred specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A supercooling structure, applied to an air conditioning system, the air conditioning system comprising a compressor, a condenser, a throttling device and an evaporator connected in sequence, characterized in that: The supercooling structure comprises: A gas-liquid separator, the gas-liquid separator comprises a shell and a return pipe, the shell is provided with a accommodating chamber and a liquid inlet, a liquid outlet, an air inlet and an air outlet respectively connected with the accommodating chamber, the accommodating chamber comprises a refrigerant area for accommodating refrigerant and a refrigerating oil area for accommodating refrigerating oil, the liquid inlet can be used to connect with the output end of the throttling device, the liquid outlet is located in the refrigerant area and can be used to connect with the input end of the evaporator, the air inlet can be used to connect with the output end of the evaporator, the air outlet is connected with the accommodating chamber via the return pipe, and the air outlet can be used to connect with the suction end of the compressor, the return pipe is provided with an oil return hole, and the oil return hole is located in the refrigerating oil area; A subcooling device is located between the output end of the condenser and the input end of the throttling device, and is used to subcool the fluid output from the condenser; the subcooling device is connected to the liquid inlet through a liquid inlet pipe, and the subcooling device is connected to the air inlet through an air outlet pipe.

2. The supercooling structure according to claim 1, characterized in that: The supercooling device includes a sleeve, which is sleeved on the pipeline between the output end of the condenser and the input end of the throttling device, and is enclosed with the pipeline to form a cavity. The sleeve is provided with a sleeve liquid inlet and a sleeve air outlet. The cavity is connected with the liquid inlet pipe through the sleeve liquid inlet, and the cavity is connected with the air outlet pipe through the sleeve air outlet.

3. The supercooling structure according to claim 1, characterized in that: The first end of the reflux pipe is located in the accommodating cavity and communicates with the air inlet through the accommodating cavity. The second end of the reflux pipe can be used to communicate with the air outlet. Along the height direction of the shell, the height of the first end is higher than the height of the liquid level in the accommodating cavity, and the height of the first end is lower than the height of the air inlet.

4. The supercooling structure according to claim 1, characterized in that: When the density of the refrigerant is greater than the density of the refrigeration oil, the refrigeration oil area is located above the refrigerant area, the vertical distance between the liquid surface of the refrigeration oil and the liquid surface of the refrigerant is H1, the vertical distance between the oil return hole and the liquid surface of the refrigeration oil is h1, 1 / 3H1≤h1≤1 / 2H1; When the density of the refrigerating oil is greater than the density of the refrigerant, the refrigerating oil zone is located below the refrigerant zone, the vertical distance between the liquid level of the refrigerating oil and the bottom of the accommodating chamber is H2, the vertical distance between the oil return hole and the bottom of the accommodating chamber is h2, 1 / 3H2≤h2≤1 / 2H2.

5. The supercooling structure according to claim 1, characterized in that: The gas-liquid separator further comprises a connecting pipe, through which the liquid inlet is communicated with the accommodating cavity, and the shell is further provided with an outlet, through which the liquid inlet pipe is communicated with the connecting pipe.

6. The supercooling structure according to claim 5, characterized in that: In the height direction of the shell, the height of the liquid inlet is higher than the height of the outlet.

7. The supercooling structure according to claim 5, characterized in that: One end of the connecting pipe away from the liquid inlet is located at the place where the refrigerant and the refrigeration oil are layered.

8. The supercooling structure according to claim 1, characterized in that: The supercooling structure further includes a refrigerant pump, the input end of the refrigerant pump is connected to the liquid outlet, and the output end of the refrigerant pump can be used to connect to the input end of the evaporator.

9. The supercooling structure according to any one of claims 1 to 8, characterized in that: The supercooling structure further comprises a drying filter, the input end of the drying filter can be used to be connected to the output end of the condenser, and the output end of the drying filter can be used to be connected to the input end of the throttling device.

10. An air conditioning system, characterized in that: The invention comprises a supercooling structure as claimed in any one of claims 1 to 9 and a compressor, a condenser, a throttling device and an evaporator connected in sequence.

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