Gas-liquid separator

Abstract

The utility model provides a kind of gas-liquid separator, gas-liquid separator includes: shell, with containing cavity, the height of containing cavity is H1;One end of inlet pipe is communicated with containing cavity, one end of outlet pipe is located in containing cavity, and is communicated with containing cavity, the distance between the highest point and the lowest point of outlet pipe in containing cavity is H2, 1 / 5≤H2 / H1≤4 / 5;Oil return mechanism is set on shell, and oil return mechanism includes oil return pipe, the aperture of oil return pipe is less than the aperture of outlet pipe, oil return pipe has relatively arranged oil inlet and oil outlet, oil outlet is located in containing cavity, and is communicated with outlet pipe, oil inlet is communicated with the bottom of containing cavity, and oil return pipe is used to deliver the oil liquid of the bottom of containing cavity to outlet pipe. Through the technical scheme provided by the utility model, the problem that the length of outlet pipe is relatively long in the prior art, which leads to the reduction of gas flow speed and further affects the operating efficiency of the entire refrigeration system, can be solved.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning technology, and more specifically, to a gas-liquid separator. Background Technology

[0002] Currently, in refrigeration and air conditioning systems, the gas-liquid separator is one of the key components ensuring stable system operation. Its main function is to separate the gas-liquid refrigerant mixture discharged from the evaporator, allowing the gaseous refrigerant to enter the compressor, while the liquid refrigerant is stored at the bottom of the gas-liquid separator to prevent liquid slugging in the compressor and extend its service life. The most common gas-liquid separator design uses a single U-shaped outlet pipe with an oil return hole near the bottom of the outlet pipe to facilitate gas discharge and oil recovery.

[0003] In existing technology, because liquid refrigerant is stored at the bottom of the tank of the gas-liquid separator, the oil return hole needs to be connected to the liquid refrigerant at the bottom, and the height of the inlet of the U-shaped outlet pipe needs to be higher than the liquid level in the tank. Therefore, the inlet and outlet are generally located at the top. This makes the U-shaped outlet pipe usually extend from the top to the bottom of the shell, which is quite long. This increases the resistance encountered by the gas during the flow in the U-shaped outlet pipe. Especially under high pressure conditions, the excessively long U-shaped pipe will reduce the gas flow speed, thereby affecting the operating efficiency of the entire refrigeration system. Utility Model Content

[0004] This invention provides a gas-liquid separator to solve the problem in the prior art where the long length of the gas outlet pipe leads to a decrease in gas flow velocity, which in turn affects the operating efficiency of the entire refrigeration system.

[0005] To address the aforementioned problems, this utility model provides a gas-liquid separator, comprising: a shell having a receiving cavity with a height of H1; an inlet pipe and an outlet pipe spaced apart on the shell, one end of the inlet pipe communicating with the receiving cavity, and one end of the outlet pipe located within and communicating with the receiving cavity, the distance between the highest and lowest points of the outlet pipe within the receiving cavity being H2, where 1 / 5 ≤ H2 / H1 ≤ 4 / 5; and an oil return mechanism disposed on the shell, comprising an oil return pipe with a smaller orifice diameter than the outlet pipe, the oil return pipe having an inlet and an outlet oppositely arranged, the outlet located within the receiving cavity and communicating with the outlet pipe, the inlet communicating with the bottom of the receiving cavity, and the oil return pipe used to transport oil from the bottom of the receiving cavity to the outlet pipe.

[0006] Furthermore, the oil return mechanism also includes a control component, which is installed on the oil return pipe to enable or disconnect the oil inlet and outlet.

[0007] Furthermore, the return oil pipe includes a first pipe section and a second pipe section. The bottom of the housing has a first opening and a second opening spaced apart. One end of the first pipe section is located in the receiving cavity and connected to the vent pipe. The other end of the first pipe section extends out of the housing through the first opening. The end of the first pipe section near the vent pipe has an oil outlet. One end of the second pipe section is connected to the second opening. The end of the second pipe section near the second opening has an oil inlet. The control assembly includes a control valve located outside the housing and disposed between the first pipe section and the second pipe section. The control valve is used to connect or disconnect the first pipe section and the second pipe section so that the oil inlet and the oil outlet are connected or disconnected.

[0008] Furthermore, the control component also includes: a first pressure sensor disposed on the first pipe section, the first pressure sensor being used to detect the pressure P1 in the first pipe section; a second pressure sensor disposed near the second opening, the second pressure sensor being used to detect the pressure P2 at the second opening; and a control valve opening or closing according to the detection data of the first pressure sensor and the second pressure sensor, wherein when P2-P1 reaches a first preset value, the control valve connects the first pipe section and the second pipe section.

[0009] Furthermore, the diameter of the return oil pipe is R1, the diameter of the outlet pipe is R2, and 1 / 10≤R1 / R2≤1 / 2.

[0010] Furthermore, the section of the return oil pipe located within the containment cavity is a straight pipe structure and extends along the height direction of the shell.

[0011] Furthermore, the section of the return oil pipe located within the receiving cavity has a bent pipe structure.

[0012] Furthermore, the section of the vent pipe located within the accommodating cavity is a bent pipe structure, with its end extending toward the top of the housing. The bottom of the vent pipe has an oil return port, which is connected to the oil outlet of the oil return pipe.

[0013] Furthermore, the cross-sectional area of ​​the bottom of the shell gradually decreases in the direction away from the top of the shell, and the second opening is located at the lowest point of the bottom of the shell.

[0014] Furthermore, the control component also includes an oil level sensor, which is installed inside the receiving cavity to detect the liquid level inside the receiving cavity. When the liquid level inside the receiving cavity reaches the highest preset value, the control component opens the oil inlet and oil outlet; when the liquid level inside the receiving cavity reaches the lowest preset value, the control component closes the oil inlet and oil outlet.

[0015] Furthermore, the oil return mechanism also includes a filter, which is installed on the oil return pipe and is used to filter impurities in the oil within the oil return pipe.

[0016] In this solution, by separating the exhaust pipe and the oil return pipe, the ratio of the height of the exhaust pipe within the receiving cavity to the total height of the receiving cavity is adjusted. Compared to the prior art where a single exhaust pipe extends from the top to the bottom of the receiving cavity, the above-mentioned arrangement in this application allows the exhaust pipe to return oil via the oil return pipe, preventing it from extending into the oil at the bottom of the receiving cavity. This shortens the length of the exhaust pipe, thereby reducing the path length of gas flow, lowering flow resistance, and improving the overall energy efficiency of the system. Simultaneously, it reduces the use of metal pipes, lowers raw material costs, simplifies the processing technology, and saves manufacturing costs. Furthermore, the separate design of the exhaust pipe and the oil return pipe allows for flexible adjustment of their length and direction according to actual application requirements, facilitating adaptation to the internal space layout of different models and improving the versatility of the exhaust pipe. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0018] Figure 1 A partial cross-sectional view of a gas-liquid separator provided in an embodiment of the present invention is shown;

[0019] Figure 2 A perspective structural schematic diagram of a gas-liquid separator provided in an embodiment of the present invention is shown;

[0020] Figure 3 A schematic diagram of the structure of a gas-liquid separator provided in an embodiment of the present invention is shown.

[0021] The above figures include the following reference numerals:

[0022] 10. Shell; 101. Receiving cavity;

[0023] 102. First opening;

[0024] 103. Second opening;

[0025] 20. Air intake pipe;

[0026] 30. Air outlet pipe;

[0027] 40. Oil return mechanism; 41. Oil return pipe; 411. Oil inlet; 412. Oil outlet;

[0028] 413. First pipe section; 414. Second pipe section;

[0029] 42. Control valve; 43. Filter. Detailed Implementation

[0030] The technical solutions in at least one embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. The following description of at least one embodiment is merely illustrative and is not intended to limit this application or its applications. Other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are all within the scope of protection of this application.

[0031] like Figures 1 to 3 As shown, an embodiment of this utility model provides a gas-liquid separator, which includes a housing 10, an inlet pipe 20, an outlet pipe 30, and an oil return mechanism 40. The housing 10 has a receiving cavity 101 with a height of H1. The inlet pipe 20 and the outlet pipe 30 are spaced apart on the housing 10. One end of the inlet pipe 20 communicates with the receiving cavity 101, and one end of the outlet pipe 30 is located inside and communicates with the receiving cavity 101. The other end of the outlet pipe 30 is located outside the receiving cavity 101 and communicates with a compressor. The distance between the highest and lowest points of the outlet pipe 30 within the receiving cavity 101 is H2, where 1 / 5 ≤ H2 / H1 ≤ 4 / 5. If H2 / H1 < 1 / 5, the outlet pipe 30 is too short and difficult to manufacture. When both the inlet pipe 20 and the outlet pipe 30 are located at the top of the housing 10, the above range can easily lead to the outlet of the inlet pipe 20 being close to the inlet of the outlet pipe 30, which can cause some of the oil in the inlet pipe 20 to flow directly into the inlet of the outlet pipe 30 and be discharged, thus causing liquid slugging in the compressor. If H2 / H1 > 4 / 5, the outlet pipe 30 is too long, resulting in a longer gas flow length, greater flow resistance, and lower overall system efficiency. It may also cause the inlet of the outlet pipe 30 to be close to the bottom of the receiving cavity 101. In addition, the outlet pipe 30 will occupy the liquid storage space at the bottom of the receiving cavity 101, making the liquid storage space too small.

[0032] This application, by setting the size of the outlet pipe 30 within the aforementioned range, can reduce the flow resistance of gas within the outlet pipe 30, thereby reducing the occurrence of liquid slugging in the compressor. It also creates a significant height difference between the inlet of the outlet pipe 30 and the bottom of the receiving cavity 101, facilitating oil storage. Simultaneously, it reduces or even eliminates the space occupied by the outlet pipe 30 at the bottom of the receiving cavity 101, increasing the liquid storage capacity of the receiving cavity 101. Furthermore, it facilitates the processing and production of the outlet pipe 30.

[0033] It is understandable that the highest point of the vent pipe 30 within the receiving cavity 101 is the position where the pipe section contacts the inner side of the top wall of the housing 10, and the lowest point of the vent pipe 30 within the receiving cavity 101 is the position of the lowest point on the outer wall of the pipe section.

[0034] The oil return mechanism 40 is installed on the housing 10. The oil return mechanism 40 includes an oil return pipe 41. The diameter of the oil return pipe 41 is smaller than the diameter of the outlet pipe 30. This effectively reduces the possibility of gas flowing back into the oil return pipe 41. Simultaneously, the smaller diameter of the oil return pipe 41 allows for better control of the oil return volume, preventing a large amount of oil from flooding into the compressor at once and causing liquid slugging. The oil return pipe 41 has an oil inlet 411 and an oil outlet 412 arranged opposite to each other. The oil outlet 412 is located inside the receiving cavity 101 and communicates with the outlet pipe 30. The oil inlet 411 communicates with the bottom of the receiving cavity 101. The oil return pipe 41 is used to transport the oil at the bottom of the receiving cavity 101 to the outlet pipe 30.

[0035] In a preferred embodiment, the orifice diameter of the oil return pipe 41 is R1, and the orifice diameter of the outlet pipe 30 is R2, where 1 / 10 ≤ R1 / R2 ≤ 1 / 2. If R1 / R2 is greater than 1 / 2, the gaseous refrigerant is prone to containing excessive oil, which can easily cause liquid slugging in the compressor. If R1 / R2 is less than 1 / 10, the oil return rate is prone to being too low, affecting the oil return efficiency of the oil return mechanism 40. This application sets the orifice diameter ratio of the oil return pipe 41 to the outlet pipe 30 within the above-mentioned range, which can both ensure the oil return efficiency of the oil return mechanism 40 and prevent the gaseous refrigerant from carrying excessive oil into the compressor.

[0036] In this solution, by separating the exhaust pipe 30 and the oil return pipe 41, the ratio of the height H2 of the portion of the exhaust pipe 30 inside the receiving cavity 101 to the total height H1 of the receiving cavity 101 is adjusted. Compared to the prior art where a single exhaust pipe extends from the top to the bottom of the receiving cavity, the above-mentioned arrangement in this application allows the exhaust pipe 30 to return oil through the oil return pipe 41, eliminating the need for it to extend into the oil at the bottom of the receiving cavity 101. This shortens the length of the exhaust pipe 30, thereby reducing the path length of gas flow, lowering flow resistance, and improving the overall energy efficiency of the system. Simultaneously, it reduces the use of metal pipes, lowers raw material costs, simplifies the processing technology, and thus saves manufacturing costs. Furthermore, the separate design of the exhaust pipe 30 and the oil return pipe 41 allows for flexible adjustment of their length and direction according to actual application requirements, facilitating adaptation to the internal space layout of different models and improving the versatility of the exhaust pipe 30 and the oil return mechanism 40.

[0037] In this embodiment, both the air inlet pipe 20 and the air outlet pipe 30 are located on the top of the housing 10, and the oil return pipe 41 is welded to the air outlet pipe 30.

[0038] In other embodiments, the air inlet pipe 20 and the air outlet pipe 30 may be located at other positions on the housing 10.

[0039] like Figure 1 and Figure 2As shown, the return oil pipe 41 includes a first pipe section 413 and a second pipe section 414. The bottom of the housing 10 has a first opening 102 and a second opening 103 spaced apart. One end of the first pipe section 413 is located in the receiving cavity 101 and connected to the vent pipe 30. The other end of the first pipe section 413 extends out of the housing 10 through the first opening 102. The end of the first pipe section 413 near the vent pipe 30 has an oil outlet 412. One end of the second pipe section 414 is connected to the second opening 103, and the end of the second pipe section 414 near the second opening 103 has an oil inlet 411. Thus, the separate design of the first pipe section 413 and the second pipe section 414 allows the length, diameter, and orientation of the first pipe section 413 and the second pipe section 414 to be adjusted and optimized according to different usage requirements, improving the versatility of the return oil mechanism 40.

[0040] In this embodiment, the section of the return oil pipe 41 located within the receiving cavity 101 is a straight pipe structure and extends along the height direction of the shell 10. That is, the section of the first pipe segment 413 located within the receiving cavity 101 is a straight pipe structure. The design of the straight pipe structure simplifies the internal flow channel of the return oil pipe 41, which can save material usage, reduce production costs, and reduce fluid resistance, thereby reducing energy loss. In addition, the structure is simple and convenient for production and installation.

[0041] In other embodiments, the section of the return oil pipe 41 located within the receiving cavity 101 is a bent pipe structure. Thus, the bent portion of the pipe section can buffer the flow of oil inside the pipe, thereby absorbing some of the vibrations caused by the oil flow. Simultaneously, the deformation of the bent portion can alleviate the stress generated by thermal expansion and contraction, improving the reliability of the return oil mechanism.

[0042] In some alternative embodiments, the pipe structure can be a bent pipe, a coiled pipe, or other pipe structure with a certain curvature.

[0043] like Figure 1 As shown, the section of the vent pipe 30 located in the receiving cavity 101 is a bent pipe structure, which can buffer the flow of gas inside the pipe. The end extends towards the top of the housing 10, which can increase the height difference between the inlet of the vent pipe 30 and the bottom of the receiving cavity 101, thereby increasing the effective oil storage capacity of the receiving cavity 101, improving space utilization, and preventing the oil at the bottom of the receiving cavity 101 from directly entering the vent pipe 30 from the inlet at the end of the vent pipe 30 due to siphon effect.

[0044] Furthermore, the bottom of the vent pipe 30 has an oil return port, which is connected to the oil outlet 412 of the oil return pipe 41. This reduces the pressure at the oil return port, allowing the oil to flow more smoothly from the oil return pipe 41 into the vent pipe 30, and also shortens the length of the oil return pipe 41, reducing the flow resistance of the oil.

[0045] like Figure 2 As shown, the inlet of the exhaust pipe 30 is bent away from the intake pipe 20, which further increases the distance between the inlet of the exhaust pipe 30 and the outlet of the intake pipe 20, preventing some of the oil in the intake pipe 20 from flowing directly into the inlet of the exhaust pipe 30 and being discharged.

[0046] In this embodiment, the vent pipe 30 is a U-shaped pipe, and the oil return port is located at the lowest point of the vent pipe 30.

[0047] In other embodiments, the vent pipe 30 is a J-shaped pipe or other shaped bend, and the oil return port can be located on the pipe wall near the bottom of the vent pipe 30, such as the upper side wall at the bottom of the bend, the inclined side wall of the bend, or any other location, as long as it can ensure that the oil can enter the vent pipe 30 through the oil return port.

[0048] In some preferred embodiments, the cross-sectional area of ​​the bottom of the housing 10 gradually decreases away from the top of the housing 10, and the second opening 103 is located at the lowest point of the bottom of the housing 10, without limiting the location of the first opening 102. This promotes the concentration of oil at the lowest point, the second opening 103, which is beneficial for oil return in the second pipe section 414. Furthermore, the higher pressure at this location allows for smoother oil return and improved return efficiency.

[0049] The oil return mechanism 40 also includes a control component, which is installed on the oil return pipe 41 to connect or disconnect the oil inlet 411 and the oil outlet 412. The control component can control the connection and disconnection of the oil return pipe 41 according to the operating status of the gas-liquid separator or compressor, achieving on-demand oil return and reducing unnecessary energy consumption.

[0050] In some embodiments, by coordinating the control components with the compressor, the system is activated only when the compressor is running, thus avoiding refrigerant migration and ineffective oil return during shutdown, preventing energy waste and system performance fluctuations caused by unnecessary oil return, and improving system energy efficiency.

[0051] Because the pressure on the suction side is low during the initial startup of the compressor, a large amount of lubricating oil inside the gas-liquid separator can be directly drawn into the compressor, leading to the risk of liquid slugging.

[0052] In other embodiments, the control component can be delayed or intermittently operated during system startup via program control, i.e., the control component can be driven to operate cyclically, i.e., the control component can only operate after the compressor has stabilized, i.e., the oil inlet 411 and the oil outlet 412 can be opened. In this way, the gas-liquid separator can smoothly return the accumulated lubricating oil, reducing the risk of liquid slugging in the compressor, protecting the compressor from damage, improving the safety of compressor operation, and extending the service life of the system.

[0053] like Figure 2 and Figure 3 As shown, the control component includes a control valve 42, located outside the housing 10 and positioned between the first pipe section 413 and the second pipe section 414. The control valve 42 is used to connect or disconnect the first pipe section 413 and the second pipe section 414, thereby connecting or disconnecting the oil inlet 411 and the oil outlet 412. The control valve 42 allows for independent regulation of the oil flow from the oil inlet 411 to the oil outlet 412, and can dynamically adjust the connection status of the return oil pipe 41 according to system requirements. This avoids unnecessary or excessive oil return, reduces ineffective energy consumption, and achieves more flexible and precise return oil control.

[0054] Meanwhile, the control valve 42, the first pipe section 413 and the second pipe section 414 are located outside the housing, making them easy to observe and operate, reducing the maintenance difficulty of the oil return mechanism 40 and improving maintenance efficiency.

[0055] In other embodiments, the control valve 42 is disposed on the first pipe section 413 or the second pipe section 414.

[0056] In some embodiments, the first pipe section 413 and the second pipe section 414 are an integral pipe.

[0057] In this embodiment, the control valve 42 is a solenoid valve. It is understood that the solenoid valve includes a valve body and a valve core. The valve body has a first flow port and a second flow port that are interconnected. The valve core is movably disposed within the valve body to control the opening and closing of the first and second flow ports. This is prior art and will not be elaborated further here. The first pipe section 413 is connected to the first flow port, and the second pipe section 414 is connected to the second flow port.

[0058] In other embodiments, the control valve is a throttle valve or a multi-way valve, which can enable or block the fluid in the return oil pipe 41.

[0059] In some embodiments, the control component further includes a first pressure sensor and a second pressure sensor. The first pressure sensor is disposed on the first pipe section 413 and is used to detect the pressure P1 within the first pipe section 413. The second pressure sensor is disposed near the second opening 103 and is used to detect the pressure P2 at the second opening 103. The control valve 42 opens or closes based on the detection data from the first and second pressure sensors. When P2-P1 reaches a first preset value, the control valve 42 connects the first pipe section 413 and the second pipe section 414. The second opening 103 is the high-pressure side, with the pressure on the high-pressure side being P2. The position of the second pipe section 414 near the outlet pipe 30 is the low-pressure side, with the pressure on the low-pressure side being P1.

[0060] Thus, a safe starting oil return level can be quickly established through the first preset value. That is, only when the oil level inside the receiving cavity 101 is high enough and the generated static pressure is sufficient to overcome the resistance in the oil return pipe 41, the control valve 42 opens the first pipe section 413 and the second pipe section 414, improving the efficiency and accuracy of oil return. At this time, the static pressure is relatively large and there is less air in the oil, so the oil return is mainly liquid oil, which improves the quality of oil return.

[0061] The specific value of the first preset value is not limited; it can be calculated or adjusted according to the actual working conditions.

[0062] In some alternative embodiments, the first pressure sensor is located at the connection between the vent pipe 30 and the first pipe segment 413, or at the end of the first pipe segment 413 near the vent pipe 30, or at other locations on the first pipe segment 413.

[0063] In some alternative embodiments, the second pressure sensor may be disposed on the inner wall of the housing 10 near the second opening 103, or at the end of the second pipe section 414 near the second opening 103.

[0064] Furthermore, the control component also includes an oil level sensor, which is installed inside the receiving cavity 101 to detect the liquid level within the cavity. When the liquid level in the receiving cavity 101 reaches the highest preset value, the control component opens the oil inlet 411 and the oil outlet 412 to ensure that the compressor's lubricating oil does not accumulate excessively. When the liquid level in the receiving cavity 101 reaches the lowest preset value, the control component closes the oil inlet 411 and the oil outlet 412 to prevent the oil level from becoming too low, ensuring the compressor's normal lubrication requirements. The oil level sensor ensures that the compressor always operates at an ideal oil level, improving the system's stability and reliability.

[0065] like Figure 2 As shown, the oil return mechanism 40 also includes a filter 43, which is installed on the oil return pipe 41. The filter 43 is used to filter impurities in the oil within the oil return pipe 41. The filter 43 prevents impurities in the oil from entering the compressor and causing damage, thus improving the quality of oil return and protecting downstream equipment.

[0066] In this embodiment, a filter is installed on the second pipe section 414 to prevent impurities in the oil from clogging the control valve.

[0067] In this application, the filtration level and specifications of filter 43 are not limited, as long as it can effectively filter impurities in the oil, and can be selected according to filtration requirements.

[0068] In this application, components such as the oil level sensor, control valve, first pressure sensor, and second pressure sensor are all connected to the terminal system for signal transmission and receiving of control signals, thereby enabling the components to work together. How the above components transmit and transport signals is prior art and will not be elaborated here.

[0069] The working process of the gas-liquid separator in this application is as follows: First, the mixture of refrigerant gas and oil enters the receiving cavity 101 from the inlet pipe 20. The oil separates from the gas under the action of gravity and flows to the bottom of the receiving cavity 101. When the system needs to return oil, the control component opens the control valve 42 according to preset conditions (such as compressor operating status, pressure sensor data, or oil level sensor signal). At this time, the oil at the bottom of the housing 10 enters the return oil pipe 41 through the oil inlet 411. After being purified by the filter 43, it returns to the outlet pipe 30 through the oil outlet 412 and is finally re-inhaled by the compressor.

[0070] The technical solution provided in this application has the following advantages:

[0071] 1. Reduced fluid resistance and energy consumption: The shortened outlet pipe significantly reduces the gas outflow path and resistance, thereby reducing compressor power consumption and achieving system energy saving;

[0072] 2. Saves materials and costs: The shortened exhaust pipe and small-diameter oil return pipe reduce raw material costs and processing costs;

[0073] 3. Enhanced design flexibility and versatility: The length of the oil return pipe can be flexibly customized according to the height of the gas-liquid separator, enabling a modular design where one outlet pipe can be adapted to multiple gas-liquid separators. This reduces the number of product models.

[0074] 4. Achieve precise and controllable oil return, improving overall system performance and reliability:

[0075] a. On-demand oil return, energy saving and high efficiency: By linking the control valve with the compressor, it can be turned on only when the compressor is running, avoiding refrigerant migration and ineffective oil return during shutdown, thus improving system energy efficiency;

[0076] b. Effectively prevents compressor liquid slugging: By programming the control valve to delay opening or operate intermittently during system startup, the risk of liquid slugging is fundamentally eliminated, ensuring compressor safety.

[0077] c. Intelligent oil level management: Combined with oil level sensors or pressure sensors, it realizes automatic start-stop control based on the actual oil level, making oil return more efficient and accurate;

[0078] d. Facilitates debugging and maintenance: The pipelines and control valves located outside the casing are easy to observe and operate, which greatly facilitates system debugging and maintenance.

[0079] The above descriptions are merely some embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

[0080] The technical features of the embodiments described above can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered to be within the scope of this specification.

[0081] 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 exemplary embodiments according to this application. 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.

[0082] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. 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 exemplary only 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 drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0083] In the description of this application, 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 usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application 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 application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0084] 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.

[0085] 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 application.

Claims

1. A gas-liquid separator, characterized in that, The gas-liquid separator includes: The housing (10) has a receiving cavity (101) with a height of H1; An air inlet pipe (20) and an air outlet pipe (30) are spaced apart on the housing (10). One end of the air inlet pipe (20) is connected to the receiving cavity (101), and one end of the air outlet pipe (30) is located inside the receiving cavity (101) and is connected to the receiving cavity (101). The distance between the highest point and the lowest point of the air outlet pipe (30) inside the receiving cavity (101) is H2, and 1 / 5 ≤ H2 / H1 ≤ 4 / 5. An oil return mechanism (40) is provided on the housing (10). The oil return mechanism (40) includes an oil return pipe (41). The diameter of the oil return pipe (41) is smaller than the diameter of the air outlet pipe (30). The oil return pipe (41) has an oil inlet (411) and an oil outlet (412) arranged opposite to each other. The oil outlet (412) is located in the receiving cavity (101) and communicates with the air outlet pipe (30). The oil inlet (411) communicates with the bottom of the receiving cavity (101). The oil return pipe (41) is used to transport the oil at the bottom of the receiving cavity (101) to the air outlet pipe (30).

2. The gas-liquid separator according to claim 1, characterized in that, The oil return mechanism (40) also includes a control component, which is disposed on the oil return pipe (41) to enable or disconnect the oil inlet (411) and the oil outlet (412).

3. The gas-liquid separator according to claim 2, characterized in that, The return oil pipe (41) includes a first pipe section (413) and a second pipe section (414). The bottom of the housing (10) has a first opening (102) and a second opening (103) spaced apart. One end of the first pipe section (413) is located in the receiving cavity (101) and is connected to the vent pipe (30). The other end of the first pipe section (413) passes through the housing (10) from the first opening (102). The end of the first pipe section (413) near the vent pipe (30) has the oil outlet (412). One end of the second pipe section (414) is connected to the second opening (103). The end of the second pipe section (414) near the second opening (103) has the oil inlet (411). The control component includes a control valve (42) located outside the housing (10) and disposed between the first pipe section (413) and the second pipe section (414). The control valve (42) is used to connect or disconnect the first pipe section (413) and the second pipe section (414) so ​​that the oil inlet (411) and the oil outlet (412) are connected or disconnected.

4. The gas-liquid separator according to claim 3, characterized in that, The control component also includes: A first pressure sensor is installed on the first pipe section (413), and the first pressure sensor is used to detect the pressure P1 in the first pipe section (413); A second pressure sensor is disposed near the second opening (103), and the second pressure sensor is used to detect the pressure P2 at the second opening (103); The control valve (42) opens or closes according to the detection data of the first pressure sensor and the second pressure sensor. When P2-P1 reaches the first preset value, the control valve (42) connects the first pipe section (413) and the second pipe section (414).

5. The gas-liquid separator according to claim 1, characterized in that, The diameter of the return oil pipe (41) is R1, and the diameter of the air outlet pipe (30) is R2, 1 / 10≤R1 / R2≤1 / 2.

6. The gas-liquid separator according to claim 1, characterized in that, The return oil pipe (41) is a straight pipe section located in the receiving cavity (101) and extends along the height direction of the shell (10).

7. The gas-liquid separator according to claim 1, characterized in that, The section of the return oil pipe (41) located within the receiving cavity (101) is a bent pipe structure.

8. The gas-liquid separator according to claim 1, characterized in that, The section of the vent pipe (30) located in the receiving cavity (101) is a bent pipe structure, and its end extends toward the top of the housing (10). The bottom of the vent pipe (30) has an oil return port, which is connected to the oil outlet (412) of the oil return pipe (41).

9. The gas-liquid separator according to claim 3, characterized in that, The cross-sectional area of ​​the bottom of the housing (10) gradually decreases in the direction away from the top of the housing (10), and the second opening (103) is located at the lowest point of the bottom of the housing (10).

10. The gas-liquid separator according to claim 2, characterized in that, The control component also includes an oil level sensor, which is disposed in the receiving cavity (101) to detect the liquid level in the receiving cavity (101). When the liquid level in the receiving cavity (101) reaches the highest preset value, the control component connects the oil inlet (411) and the oil outlet (412); when the liquid level in the receiving cavity (101) reaches the lowest preset value, the control component disconnects the oil inlet (411) and the oil outlet (412).

11. The gas-liquid separator according to claim 1, characterized in that, The oil return mechanism (40) also includes a filter (43), which is disposed on the oil return pipe (41) and is used to filter impurities in the oil in the oil return pipe (41).

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