Gas-liquid separator and air conditioning system

Abstract

The utility model relates to the technical field of air conditioners, particularly provides a gas-liquid separator and an air conditioning system, and solves the problem of poor gas-liquid two-phase refrigerant separation effect of the existing gas-liquid separator. The gas-liquid separator provided by the utility model comprises a cylinder body, a gas-liquid separator body and a gas-liquid separator body, a cavity is formed in the cylinder body, a refrigerant inlet communicated with the cavity is formed in the side wall of the cylinder body, and the orientation of the refrigerant inlet deviates from the axis of the cylinder body; the air outlet end of the exhaust pipe is located outside the barrel, the air inlet end of the exhaust pipe extends into the barrel, and the height of the exhaust pipe in the vertical direction is larger than that of the refrigerant inlet; the anti-vortex plate is arranged at the inner bottom of the cylinder body; the oil outlet end of the oil return pipe is located outside the barrel, and the oil inlet end of the oil return pipe is communicated with the bottom of the cavity. According to the utility model, effective separation of gas-liquid two-phase refrigerants can be realized, and the risk of liquid impact of the compressor is reduced.

Description

Technical Field

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

[0002] In refrigeration systems, effective separation and circulation of refrigerant are crucial for ensuring efficient and stable operation. In traditional refrigeration equipment, refrigerant typically enters the gas-liquid separator cylinder via direct injection or axial delivery. This design often results in uneven distribution of the refrigerant (including both liquid and gaseous components) within the cylinder, making rapid separation of the liquid and gaseous refrigerants difficult and prone to forming eddies. These eddies not only interfere with the normal flow of the refrigerant and reduce heat exchange efficiency, but can also cause liquid refrigerant to carry gaseous refrigerant out through the oil return port, leading to problems such as poor compressor lubrication and decreased energy efficiency. Utility Model Content

[0003] The present invention aims to solve the above-mentioned technical problems, namely, to at least solve the problem of poor gas-liquid two-phase refrigerant separation effect in existing gas-liquid separators.

[0004] In a first aspect, the present invention provides a gas-liquid separator, the gas-liquid separator comprising:

[0005] A cylindrical body having an internal cavity, and a refrigerant inlet communicating with the cavity is provided on the side wall of the cylindrical body, the refrigerant inlet being oriented off-axis from the cylindrical body;

[0006] An exhaust pipe, the outlet of which is located outside the cylinder, and the inlet of which extends into the interior of the cylinder and is higher in the vertical direction than the refrigerant inlet;

[0007] A vortex-resistant plate is provided at the inner bottom of the cylinder;

[0008] The oil return pipe has its oil outlet located outside the cylinder and its oil inlet connected to the bottom of the cavity.

[0009] This invention sets the refrigerant inlet to be oriented off-axis of the cylinder, causing the two-phase refrigerant (i.e., a mixture of gaseous and liquid refrigerant) entering the cylinder to rotate spirally along the cylinder wall, forming a stable swirling effect. During this process, the liquid refrigerant is rapidly separated to the vicinity of the cylinder wall due to centrifugal force and slides down the wall surface to accumulate, effectively blocking the possibility of liquid refrigerant directly entering the suction pipe, thereby reducing the risk of liquid slugging in the compressor and providing higher stability and better cooling performance for the operation of the air conditioning system.

[0010] In addition, by adding an anti-vortex plate at the bottom of the cylinder, the vortex phenomenon that may be generated in the swirling flow can be intervened and suppressed, which is conducive to maintaining the stability of the gas-liquid interface. This ensures that the liquid refrigerant can be discharged smoothly and stably from the return oil pipe, and also reduces the situation of gas mixing into the liquid refrigerant, realizing the effective separation of the gas and liquid two-phase refrigerant, and further improving the operating efficiency and reliability of the entire system.

[0011] In some feasible embodiments of the gas-liquid separator described above, the anti-vortex plate includes two partition plates, which are arranged in a cross shape at the bottom of the inner part of the cylinder.

[0012] In some feasible embodiments of the gas-liquid separator described above, one of the partition plates has an upward-facing first insertion port in the middle, and the other partition plate has a downward-facing second insertion port in the middle. The first insertion port and the second insertion port are adapted to each other, so that the two partition plates can be inserted and fitted together, thus forming a cross-shaped intersecting structure; or

[0013] The partition plate is integrally formed with the inner bottom of the cylinder.

[0014] In some feasible embodiments of the gas-liquid separator described above, the return oil pipe includes a first pipe section; part or all of the first pipe section is located inside the cylinder, and the first pipe section is inclined such that its oil inlet end is lower than its oil outlet end.

[0015] In some feasible embodiments of the gas-liquid separator described above, the gas-liquid separator further includes a baffle; the baffle is disposed inside the cylinder and at least covers the linear injection area of ​​the refrigerant inlet; the baffle is higher than the refrigerant inlet and lower than the air inlet end of the exhaust pipe.

[0016] In some feasible embodiments of the gas-liquid separator described above, the inlet end of the exhaust pipe has an inclined open end face, the higher point of which is located on the side away from the baffle.

[0017] In some feasible embodiments of the gas-liquid separator described above, the exhaust pipe includes a second pipe section and a third pipe section; the second pipe section is vertically arranged and its air inlet end is located above the baffle; the third pipe section is horizontally arranged and smoothly connected to the second pipe section.

[0018] In some feasible embodiments of the gas-liquid separator described above, the outlet end of the third pipe section extends to the outside of the cylinder and is connected to a connecting hose.

[0019] In a second aspect, the present invention also provides an air conditioning system, the air conditioning system including the gas-liquid separator described in any of the foregoing technical solutions.

[0020] Those skilled in the art will understand that, since the air conditioning system includes the gas-liquid separator described in any of the foregoing technical solutions, the air conditioning system possesses all the technical effects that the aforementioned gas-liquid separator can achieve, and will not be elaborated further here.

[0021] In some feasible embodiments of the above-mentioned air conditioning system, the air conditioning system further includes a compressor, a first heat exchanger, an electronic expansion valve, and a second heat exchanger. The compressor, the first heat exchanger, the electronic expansion valve, the second heat exchanger, and the gas-liquid separator are sequentially connected through pipelines to form a circulation loop.

[0022] The refrigerant inlet is connected to the refrigerant outlet of the second heat exchanger, the outlet end of the exhaust pipe is connected to the suction port of the compressor, and the oil outlet end of the oil return pipe is connected to the oil inlet of the compressor. Attached Figure Description

[0023] The preferred embodiments of this utility model are described below with reference to the accompanying drawings, in which:

[0024] Figure 1 A three-dimensional structural diagram of the gas-liquid separator provided in an embodiment of this utility model;

[0025] Figure 2 for Figure 1 A structural diagram showing the structure when the top of the cylinder is removed;

[0026] Figure 3 for Figure 2 A structural diagram showing the disassembly of the cylinder body;

[0027] Figure 4 A front view of a gas-liquid separator provided in an embodiment of this utility model;

[0028] Figure 5 for Figure 4 A cross-sectional view along the AA direction;

[0029] Figure 6 This is a schematic diagram of the anti-vortex plate provided in an embodiment of the present utility model;

[0030] Figure 7 A schematic diagram of the disassembly and assembly of the anti-vortex plate provided in this embodiment of the utility model;

[0031] Figure 8 This is a schematic diagram of the structure of the return oil pipe provided in an embodiment of the present utility model;

[0032] Figure 9 This is a schematic diagram of the exhaust pipe provided in an embodiment of the present utility model.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Cylinder body; 11. Cylinder top; 12. Cylinder body; 13. Cylinder bottom; 14. Base support; 2. Refrigerant inlet; 3. Exhaust pipe; 31. Second pipe section; 32. Third pipe section; 321. Connecting hose; 4. Oil return pipe; 41. First pipe section; 42. Fourth pipe section; 5. Anti-vortex plate; 51. First partition plate; 511. First inlet; 52. Second partition plate; 521. Second inlet; 6. Baffle. Detailed Implementation

[0035] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. Those skilled in the art can make adjustments as needed to adapt to specific applications. To better illustrate the present invention, numerous specific details are provided in the following detailed description. Those skilled in the art should understand that the present invention can be implemented even without certain specific details.

[0036] In the description of this utility model, terms such as "upper," "lower," "inner," "outer," "left," "right," "front," and "rear," which indicate direction or positional relationships, are based on the actual direction or positional relationships in practical application. These terms are used merely for ease of description and do not indicate or imply that the device to be protected must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, ordinal numbers such as "first" and "second" are used only for convenience of explanation and are not used to indicate or imply relative importance.

[0037] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0038] Please see Figures 1 to 9 This utility model provides a gas-liquid separator, which includes a cylinder 1, an exhaust pipe 3, an anti-vortex plate 5, and an oil return pipe 4.

[0039] Among them, such as Figures 1 to 3 As shown, the cylinder 1 includes a cylinder top 11, a cylinder body 12, a cylinder bottom 13 and a bottom support 14 arranged sequentially from top to bottom. The inside of the cylinder 1 forms a cavity, and the side wall of the cylinder 1 is provided with a refrigerant inlet 2 that communicates with the cavity. The orientation of the refrigerant inlet 2 is off-axis from the cylinder 1.

[0040] Specifically, the orientation of the refrigerant inlet 2 deviates from the axis of the cylinder 1, meaning that the extension direction of the centerline of the refrigerant inlet 2 does not pass through the axis of the cylinder 1, and the centerline of the refrigerant inlet 2 forms a certain angle with the axis of the cylinder 1, which is greater than 0° and less than 180°. For example... Figure 4 and Figure 5 As shown, the centerline of the refrigerant inlet 2 is perpendicular to the axis of the cylinder 1, with an included angle of 90°. That is, when the axis of the cylinder 1 is set vertically, the centerline of the refrigerant inlet 2 is set horizontally, so that the gas enters along the tangential direction of the inner wall of the cylinder 1 as much as possible, so as to form a rotating airflow inside the cylinder 1.

[0041] The exhaust pipe 3 has its outlet located outside the cylinder 1, and its inlet extends into the interior of the cylinder 1 and is higher than the refrigerant inlet 2 in the vertical direction.

[0042] Since the gas-liquid mixture enters the gas-liquid separator from the refrigerant inlet 2, the liquid, due to its higher density, settles to the bottom of the separator, while the gas, due to its lower density, rises to the top. This invention employs a design where the inlet of the exhaust pipe 3 is higher than the refrigerant inlet 2. The gas enters the exhaust pipe 3 from a higher position, while the liquid settles to the bottom of the separator under gravity, effectively separating the flow paths of the gas and liquid. This ensures that the gas does not directly contact the liquid near the refrigerant inlet during its ascent, improving separation efficiency and reducing the risk of liquid being entrained by the gas. The outlet of the exhaust pipe 3 extends to the outside of the cylinder 1 and connects to the compressor's suction port, used to transport the separated gas from the gas-liquid separator to the compressor, ensuring smooth refrigerant circulation throughout the pipeline.

[0043] The oil outlet of the oil return pipe 4 is located outside the cylinder 1, and the oil inlet of the oil return pipe 4 is connected to the bottom of the cavity. The oil outlet of the oil return pipe 4 is connected to the oil inlet of the compressor, which is used to transport the liquid separated in the gas-liquid separator to the inside of the compressor, so that the lubricating oil at the bottom of the gas-liquid separator can flow back to the compressor smoothly, ensuring that the compressor always has a sufficient and stable supply of lubricating oil during operation, and ensuring that the compressor can operate stably.

[0044] Specifically, such as Figure 8 As shown, the oil return pipe 4 includes a first pipe section 41, which is partially or entirely located inside the cylinder 1. The first pipe section 41 is inclined with its oil inlet end lower than its oil outlet end. This inclined arrangement of the first pipe section 41 effectively guides the lubricating oil separated in the gas-liquid separator to continuously flow back to the compressor, which helps to prevent oil from accumulating inside the separator. In addition, the oil return pipe 4 also includes a fourth pipe section 42. The oil inlet end of the fourth pipe section 42 is connected to the oil outlet end of the first pipe section 41, and the oil outlet end of the fourth pipe section 42 extends to the outside of the cylinder 1 and connects to the oil inlet of the compressor.

[0045] In addition, a solenoid valve with intelligent control over its opening and closing is installed on the oil return pipe 4. By monitoring the oil level inside the compressor, when the oil level inside the compressor is lower than a preset threshold, the solenoid valve automatically opens to replenish the oil. After the oil level returns to the safe range, the solenoid valve closes to maintain a stable oil level. During the compressor start-up phase, the solenoid valve is triggered synchronously to effectively avoid the risk of oil overrush during compressor start-up. During shutdown, the solenoid valve executes a 1-minute delay closing procedure to ensure that the residual oil in the gas-liquid separator is fully returned to the compressor cavity, realizing closed-loop management of the system oil quantity.

[0046] Anti-vortex plate 5 is installed at the inner bottom of cylinder 1. Specifically, as shown... Figure 6 and Figure 7 As shown, the anti-vortex plate 5 includes two partition plates, which are arranged in a cross shape at the bottom of the inner part of the cylinder 1.

[0047] The cross-shaped anti-vortex plate 5 physically blocks the liquid rotation path and forces a change in the fluid direction, allowing the gas and liquid phases to fully diffuse and stratify during flow. This effectively suppresses vortex phenomena that may occur in the swirling flow, which helps maintain the stability of the gas-liquid interface. At the same time, the surface of the partition plate is used as an oil droplet attachment point, accelerating the accumulation of oil droplets at the bottom of the gas-liquid separator. This ensures that the liquid refrigerant can be discharged smoothly and stably from the return oil pipe 4, and also reduces the possibility of gas mixing into the liquid refrigerant.

[0048] In one implementation, such as Figure 6 and Figure 7 As shown, one of the partition plates (i.e., the first partition plate 51 in the figure) has an upward-facing first insertion port 511 in the middle, and the other partition plate (i.e., the second partition plate 52 in the figure) has a downward-facing second insertion port 521 in the middle. The first insertion port 511 and the second insertion port 521 are compatible with each other, so that the two partition plates can be inserted and connected to form a cross-shaped cross structure.

[0049] Specifically, the cylinder 1 of the gas-liquid separator is provided with a slot that matches the partition plate, so that the two partition plates can be installed at the bottom of the gas-liquid separator by plugging and detaching. During installation, the two partition plates only need to be plugged in perpendicularly to form a cross-shaped anti-vortex plate 5 structure. No special tools or complicated operations are required. In addition, during later maintenance, each partition plate can be disassembled individually for cleaning or replacement, which has the advantages of convenient installation and disassembly and reduced maintenance costs.

[0050] In another embodiment, the partition plate is integrally formed with the inner bottom of the cylinder 1. The integral forming design can eliminate welding or connection gaps between the partition plate and the cylinder 1, avoid the partition plate from loosening or vibrating due to fluid impact, and ensure the long-term stable operation of the anti-vortex plate 5.

[0051] In this embodiment, as Figure 2 and Figure 3 As shown, the gas-liquid separator also includes a baffle 6, which is disposed inside the cylinder 1 and covers at least the straight injection area of ​​the refrigerant inlet 2. The baffle 6 is higher than the refrigerant inlet 2 and lower than the air inlet end of the exhaust pipe 3.

[0052] By employing a baffle 6 that at least covers the straight-line injection area of ​​the refrigerant inlet 2, and with the baffle 6 being higher than the refrigerant inlet 2 and lower than the air inlet end of the exhaust pipe 3, a protective barrier can be formed within the cylinder 1 of the gas-liquid separator. This barrier combines interception and flow guidance functions and facilitates gas-liquid separation. This design not only uses a physical barrier mechanism to intercept the high-speed injected refrigerant and completely block the channel for liquid refrigerant to directly rush into the exhaust pipe 3, thus eliminating the risk of liquid entrainment, but also forces the refrigerant to change direction to form a "gravity settling zone," guiding the refrigerant downwards and appropriately extending the gas-liquid separation time. By utilizing the difference in gravity, the gaseous and liquid refrigerants are separated. At the same time, the baffle 6 also works synergistically with the anti-vortex plate 5 to further suppress the turbulent state of the flow field within the cylinder 1, reduce pressure drop fluctuations, and improve the gas-liquid separation effect of the gas-liquid separator.

[0053] Furthermore, the intake end of the exhaust pipe 3 has an inclined opening face, with the higher point of the opening face located on the side away from the baffle 6. The inclined opening face can effectively increase the intake cross-sectional area of ​​the exhaust pipe 3, facilitating smoother airflow into the exhaust pipe 3, which is beneficial to increasing the intake volume and intake speed of the exhaust pipe 3. Moreover, since the higher point of the opening face is located on the side away from the baffle 6, this can improve the gas delivery efficiency of the gas-liquid separator to the compressor without affecting the gas-liquid separation effect.

[0054] Please see Figure 2 , Figure 3 and Figure 9 The exhaust pipe 3 includes a second pipe section 31 and a third pipe section 32. The second pipe section 31 is vertically arranged and its air intake end is located above the baffle 6. The third pipe section 32 is horizontally arranged and smoothly connected to the second pipe section 31.

[0055] After the refrigerant undergoes the crucial gas-liquid separation process within the cylinder 1, the gaseous refrigerant flows into the exhaust pipe 3 at a certain speed and pressure. At this point, the vertically positioned second pipe section 31 acts as a buffer for the airflow entering the exhaust pipe 3, guiding it to gradually slow down and achieve a more uniform pressure distribution. This prevents the airflow from being directly discharged from the horizontally positioned third pipe section 32, effectively suppressing local turbulence and pressure fluctuations, allowing the airflow to enter the third pipe section 32 in a smooth and orderly manner. The third pipe section 32 is horizontally positioned and smoothly connected to the second pipe section 31. This design makes the airflow between the two pipe sections smoother, reducing flow resistance caused by sudden changes at the pipe section connections. This allows the airflow to flow smoothly within the exhaust pipe 3, reducing energy loss, improving the gas delivery efficiency of the gas-liquid separator to the compressor, and ensuring the efficient and stable operation of the entire air conditioning system.

[0056] In addition, such as Figure 9 As shown, the outlet end of the third pipe section 32 extends to the outside of the cylinder 1 and is connected to a connecting hose 321, which is used to connect to the compressor's suction port. Since the compressor generates vibration and impact during operation, the connecting hose 321, with its flexible structure, can effectively absorb and buffer these vibrations, reducing the propagation range and intensity of the vibrations, thereby improving the overall stability of the equipment's operation. Compared to rigid pipes, the connecting hose 321 is flexible and foldable. During installation, installers can make minor adjustments to the connecting hose 321 according to the actual position of the compressor's suction port. Furthermore, in limited space, its routing can be flexibly adjusted, reducing the requirements for installation precision. This establishes a stable and reliable connection channel between the gas-liquid separator and the compressor, effectively ensuring the stable operation of the air conditioning system.

[0057] This utility model also provides an air conditioning system, which includes a compressor, a first heat exchanger, an electronic expansion valve, a second heat exchanger, and a gas-liquid separator as described in any of the aforementioned technical solutions. The compressor, the first heat exchanger, the electronic expansion valve, the second heat exchanger, and the gas-liquid separator are connected in sequence through pipelines to form a circulation loop. The refrigerant inlet 2 of the gas-liquid separator is connected to the refrigerant outlet of the second heat exchanger, the outlet end of the exhaust pipe 3 is connected to the suction port of the compressor, and the oil outlet end of the oil return pipe 4 is connected to the oil inlet of the compressor.

[0058] This invention sets the refrigerant inlet 2 to be oriented off-axis from the cylinder 1, causing the two-phase refrigerant (i.e., a mixture of gaseous and liquid refrigerant) entering the cylinder 1 to rotate spirally along the cylinder wall, forming a stable swirling effect. During this process, the liquid refrigerant is rapidly separated to the vicinity of the cylinder wall due to centrifugal force and slides down and accumulates along the wall surface, effectively blocking the possibility of the liquid refrigerant directly entering the suction pipe, thereby reducing the risk of liquid slugging in the compressor and providing higher stability and better cooling performance for the operation of the air conditioning system.

[0059] In addition, by adding an anti-vortex plate 5 at the bottom of the cylinder 1, the vortex phenomenon that may be generated in the swirling flow can be intervened and suppressed, which is conducive to maintaining the stability of the gas-liquid interface. This ensures that the liquid refrigerant can be discharged smoothly and stably from the return oil pipe 4, and also reduces the situation of gas mixing into the liquid refrigerant, realizing the efficient separation of the gas and liquid two-phase refrigerant, and further improving the operating efficiency and reliability of the entire system.

[0060] The technical solution of this utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the protection scope of this utility model is obviously not limited to these specific embodiments. Without departing from the principle of this utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of this utility model.

Claims

1. A gas-liquid separator, characterized in that, The gas-liquid separator includes: A cylindrical body (1) has a cavity inside it. The side wall of the cylindrical body (1) is provided with a refrigerant inlet (2) that communicates with the cavity. The orientation of the refrigerant inlet (2) is off-axis from the axis of the cylindrical body (1). The exhaust pipe (3) has its outlet end located outside the cylinder (1) and its inlet end extending into the interior of the cylinder (1) and its height in the vertical direction is higher than that of the refrigerant inlet (2). Anti-vortex plate (5), which is disposed at the inner bottom of the cylinder (1); The oil return pipe (4) has its oil outlet located outside the cylinder (1) and its oil inlet connected to the bottom of the cavity.

2. The gas-liquid separator according to claim 1, characterized in that, The anti-vortex plate (5) includes two partition plates, which are arranged in a cross shape at the bottom of the inner part of the cylinder (1).

3. The gas-liquid separator according to claim 2, characterized in that, One of the partitions has an upward-facing first insertion port (511) in the middle, and the other partition has a downward-facing second insertion port (521) in the middle. The first insertion port (511) and the second insertion port (521) are compatible with each other, allowing the two partitions to be inserted and thus forming a cross-shaped intersecting structure; or The partition plate is integrally formed with the inner bottom of the cylinder (1).

4. The gas-liquid separator according to claim 1, characterized in that, The return oil pipe (4) includes a first pipe section (41); Part or all of the first pipe section (41) is located inside the cylinder (1), and the first pipe section (41) is inclined with its oil inlet end lower than its oil outlet end.

5. The gas-liquid separator according to claim 1, characterized in that, The gas-liquid separator also includes a baffle (6); The baffle (6) is disposed inside the cylinder (1), and the baffle (6) at least covers the straight injection area of ​​the refrigerant inlet (2); The baffle (6) is higher than the refrigerant inlet (2) and lower than the air inlet end of the exhaust pipe (3).

6. The gas-liquid separator according to claim 5, characterized in that, The intake end of the exhaust pipe (3) has an inclined opening end face, and the higher point of the opening end face is located on the side away from the baffle (6).

7. The gas-liquid separator according to claim 5 or 6, characterized in that, The exhaust pipe (3) includes a second pipe section (31) and a third pipe section (32); The second pipe section (31) is vertically arranged and its air inlet is located above the baffle (6); The third pipe section (32) is horizontally arranged and smoothly connected to the second pipe section (31).

8. The gas-liquid separator according to claim 7, characterized in that, The outlet end of the third pipe section (32) extends to the outside of the cylinder (1) and is connected to a connecting hose (321).

9. An air conditioning system, characterized in that, The air conditioning system includes the gas-liquid separator as described in any one of claims 1 to 8.

10. The air conditioning system according to claim 9, characterized in that, The air conditioning system also includes a compressor, a first heat exchanger, an electronic expansion valve, and a second heat exchanger. The compressor, the first heat exchanger, the electronic expansion valve, the second heat exchanger, and the gas-liquid separator are connected in sequence through pipelines to form a circulation loop. The refrigerant inlet (2) is connected to the refrigerant outlet of the second heat exchanger, the outlet end of the exhaust pipe (3) is connected to the suction port of the compressor, and the oil outlet end of the oil return pipe (4) is connected to the oil inlet of the compressor.

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