An oil separator for refrigeration equipment

Abstract

This invention relates to the field of refrigeration equipment and discloses an oil separator for refrigeration equipment, comprising a housing, an inlet pipe, an outlet pipe, and a baffle. A first filter screen is provided on the inlet pipe, and a second filter screen is provided on the outlet pipe. A deceleration and oil-catching structure is provided inside the housing. The deceleration and oil-catching structure includes a rotating shaft rotatably mounted on the baffle and a guide sleeve fixed inside the housing and sleeved outside the rotating shaft. A turbulence-reducing component and an oil-catching component are provided inside the guide sleeve. A re-filtration drive structure is provided between the housing and the inlet pipe to re-draw gas that has not entered the guide sleeve back into the inlet pipe for re-filtration while simultaneously driving the rotating shaft to rotate. The opening and closing of the re-filtration drive structure is controlled by the flow or stillness of the gas in the inlet pipe. An oil removal structure is provided between the rotating shaft and the second filter screen to reduce lubricant accumulation on the second filter screen as the rotating shaft rotates. This oil separator can reduce the gas flow rate while reducing the oil content in the gas and reducing lubricant accumulation on the second filter screen, thereby reducing the risk of oil leakage.

Description

Technical Field

[0001] This invention relates to the field of refrigeration equipment, and more particularly to an oil separator for refrigeration equipment. Background Technology

[0002] An oil separator is a key auxiliary component in a refrigeration system. It is usually installed between the compressor's discharge port and the condenser's inlet port to separate the lubricating oil mixed in the refrigerant gas and return the lubricating oil to the compressor. This reduces or prevents the lubricating oil from entering the condenser with the refrigerant gas and affecting subsequent use.

[0003] Chinese Patent Application No. 201420561375.0 discloses a filter-type oil separator, including a cylinder. An upper end cover is installed at the upper end of the cylinder, and a lower end cover is installed at the lower end. The cylinder, the upper end cover, and the lower end cover form a hollow cavity. An air inlet pipe, an air outlet pipe, and an oil return pipe are installed on the upper end cover. The top ends of the three pipes are located outside the hollow cavity, and the bottom ends are located inside the hollow cavity. The outlet of the air inlet pipe and the inlet of the air outlet pipe are equipped with filter elements. A baffle is installed inside the cylinder, dividing the hollow cavity into upper and lower sections. The oil return pipe passes through the baffle and extends to the bottom of the baffle. There is a gap between at least one side of the baffle and the inner wall of the cylinder for lubricating oil to slide down. A float valve is installed at the bottom of the oil return pipe.

[0004] The casing includes a sealed cylindrical body, an upper end cover, and a lower end cover. After the gas-oil mixture enters the casing through the inlet pipe, the volume increases instantaneously, causing a decrease in flow velocity and resulting in the separation of most oil droplets. However, some oil droplets remain mixed in the gas. At this point, the airflow approaches the outlet pipe and rapidly passes through the filter screen on the outlet pipe for secondary filtration. Lubricating oil easily accumulates on the filter screen. Because the airflow direction is from the casing outwards at high speed, this accumulated lubricating oil is torn into tiny droplets by the airflow and directly carried by the airflow through the filter screen into the condenser. This not only causes lubricating oil loss and prevents effective recovery, but these tiny oil droplets also become a hidden danger for subsequent system operation, affecting the normal operation of the condenser and the entire refrigeration system. Summary of the Invention

[0005] This invention addresses the drawback of existing technologies where lubricating oil accumulated on the filter screen of the outlet pipe is easily carried away from the oil separator by the rapidly flowing airflow. It provides an oil separator for refrigeration equipment that reduces the gas flow rate, lowers the oil content in the gas, and reduces lubricating oil accumulation on the second filter screen.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: An oil separator for a refrigeration device includes a housing, an inlet pipe and an outlet pipe disposed on the housing, and a baffle fixedly disposed inside the housing for lubricating oil to pass through. A first filter screen is disposed on the inlet pipe and a second filter screen is disposed on the outlet pipe. A deceleration and oil-catching structure is disposed inside the housing. The deceleration and oil-catching structure includes a rotating shaft disposed on the baffle inside the housing and a guide sleeve fixed inside the housing and concentrically sleeved outside the rotating shaft for allowing gas inside the housing to flow to the outlet pipe. Inside the guide sleeve, on the rotating shaft, there are a turbulence and deceleration component that disturbs the gas flow direction inside the guide sleeve to reduce its speed, and an oil-catching component that captures oil droplets in the decelerated gas flow for secondary gas-oil separation. A re-filtering drive structure is disposed between the housing and the inlet pipe to re-absorb gas that has not entered the guide sleeve into the inlet pipe for re-filtration while driving the rotating shaft to rotate. The opening and closing of the re-filtering drive structure is controlled by the flow or stillness of the gas inside the inlet pipe. An oil removal structure is disposed between the rotating shaft and the second filter screen to reduce the accumulation of lubricating oil on the second filter screen as the rotating shaft rotates.

[0007] Using the above scheme, when the gas-oil mixture enters the casing through the inlet pipe, its velocity decreases, and most of the oil droplets separate from the gas. Under the action of gravity, they flow past the baffle to the bottom of the casing, while the gas mixed with a small amount of lubricating oil flows to the outlet pipe through the guide sleeve. After entering the guide sleeve, the airflow direction is further reduced by the turbulence-reducing component that rotates slowly with the shaft. Due to the reduced airflow velocity, the oil droplets are more likely to condense. Small oil droplets continue to separate from the gas and gradually condense into larger oil droplets, which are then captured by the oil-catching component that rotates with the shaft. Under the action of gravity, they drip to the bottom of the casing, achieving secondary separation of gas and lubricating oil. The gas between the guide sleeve and the baffle does not undergo secondary separation, and due to oil droplets and the impact of gas ejected from the intake pipe, the oil content in this area remains high. Therefore, a secondary filtration drive structure is installed. Utilizing the gas flow within the intake pipe, the gas with high oil content in this area is re-intaken into the intake pipe for secondary filtration, driving the rotating shaft to rotate without requiring an additional power source. After further deceleration and purification, the gas leaves the guide sleeve and is finally filtered through a second filter before exiting the housing through the outlet pipe. The oil removal structure rotates with the shaft, promptly scraping off the lubricating oil on the second filter to prevent accumulation and reduce the risk of lubricating oil being carried away from the housing by the airflow.

[0008] Preferably, the turbulence reduction component includes turbulence blades protruding outward on the outer ring wall of the rotating shaft. The angle between the plane of the turbulence blade and the axis of the rotating shaft is an acute angle, so that when the turbulence blade rotates with the rotating shaft, there is always a plane that directly collides with the airflow to change the direction of the airflow. The plane on the turbulence blade that directly collides with the airflow is called the collision plane.

[0009] Using the above scheme, when the inclined baffles rotate with the shaft, their planes will collide with the airflow in the guide sleeve, forcibly changing the flow direction of the airflow, thereby effectively reducing the airflow speed. It also helps the lubricating oil to separate from the gas. The collision between the airflow and the baffles can also cause some oil droplets to be adsorbed on the baffles and finally drip down along the inclined baffles.

[0010] Preferably, at least one spoiler is provided at intervals on the outer ring wall of the rotating shaft.

[0011] Using the above scheme, multiple turbulence blades are spaced apart circumferentially and axially on the rotating shaft, creating a multi-directional turbulence effect to repeatedly and continuously reduce the airflow speed. By setting different tilt angles, more complex airflow disturbances can be generated, further reducing speed and improving the oil droplet separation capability.

[0012] Preferably, the oil capture assembly includes a third filter screen fixedly disposed on the collision plane of the baffle blades, the third filter screen being parallel to the collision plane and having a gap between them.

[0013] Using the above scheme, the airflow passes through the third filter, and some oil droplets are directly intercepted for further filtration. However, the airflow will accelerate as it passes through the third filter, which is not conducive to deceleration. At this time, since there are turbulence vanes behind the third filter, the airflow after passing through the third filter collides with the collision plane of the turbulence vanes, and the speed drops sharply. The distance between the third filter and the collision plane provides space for oil droplet release and accumulation.

[0014] Preferably, the multiple filtration drive structure includes a Venturi tube section disposed on the intake pipe and between the intake end of the intake pipe and the first filter screen, a transmission pipe with one end sealed and connected to the Venturi tube section and the other end located between the guide sleeve and the baffle, and a transmission structure disposed between the transmission pipe and the rotating shaft that drives the rotating shaft to rotate when the airflow flows through the Venturi tube section.

[0015] Using the above scheme, when the high-speed gas-oil mixture passes through the intake pipe, a negative pressure is generated in the venturi section. This negative pressure draws the oil-containing gas from the area between the baffle and the guide sleeve inlet back into the intake pipe via the transmission pipe. This gas is then filtered again through the first filter, achieving a cycle of purification. Simultaneously, this airflow drives the rotating shaft to rotate via a transmission structure.

[0016] Preferably, the transmission structure includes a sealing box with its opening facing the baffle and concentrically arranged with the rotating shaft. The opening end of the sealing box is sealed and fixed to the baffle, and the bottom plate of the sealing box allows the rotating shaft to pass through and is sealed and rotated. A sealing chamber is formed between the sealing box, the rotating shaft and the baffle, and the sealing chamber is sealed and connected to the end of the transmission pipe away from the air inlet pipe. An air-replenishing rotating structure is provided between the rotating shaft and the sealing box to replenish the air in the sealing chamber and drive the rotating shaft to rotate when the air in the sealing chamber is drawn into the air inlet pipe through the transmission pipe.

[0017] Using the above scheme, the sealing box and the baffle form a sealed chamber. When gas flows through the Venturi tube section and is drawn from the sealed chamber through the transmission pipe, a negative pressure is formed inside the sealed chamber, thereby triggering the gas replenishment rotation structure. The power of external gas replenishing the sealed chamber drives the rotating shaft to rotate continuously.

[0018] Preferably, the air-injection rotating structure includes a drive blade protruding vertically outward on the outer annular wall of the rotating shaft within the sealed chamber, and an air-injection hole provided on the annular wall of the sealed box for the gas between the guide sleeve and the baffle to be injected into the sealed chamber and flow rapidly in one direction into the transmission pipe to drive the drive blade and the rotating shaft to rotate.

[0019] Using the above scheme, when the gas in the sealed chamber is drawn away to form a negative pressure, the gas between the guide sleeve and the baffle flows into the sealed chamber quickly through the air inlet and flows unidirectionally toward the transmission pipe. This directional airflow directly impacts and pushes the drive blade, which drives the shaft to rotate.

[0020] Preferably, the air inlet and the transmission pipe are located on both sides of a single drive blade, and the air inlet is arranged in an inclined manner from the outer wall of the sealing box to the inner wall of the sealing box, gradually approaching the transmission pipe.

[0021] By adopting the above scheme, the air inlet and the transmission pipe are set on both sides of a single drive blade, and the air inlet is set at an angle so that the incoming airflow can impact the drive blade at a suitable angle and push the drive blade to one side of the transmission pipe, thereby driving the shaft to rotate.

[0022] Preferably, the oil removal structure includes a connecting rod with one end fixed to the rotating shaft and the other end suspended, and a scraper provided on the suspended end of the connecting rod that rotates with the rotating shaft to scrape off the lubricating oil on the second filter screen.

[0023] Using the above scheme, when the shaft rotates, the connecting rod drives the scraper to rotate synchronously. The scraper adheres to the surface of the second filter screen and continuously scrapes off the lubricating oil accumulated on the filter screen, preventing the lubricating oil from forming an oil film that clogs the filter screen or being torn away by the airflow, thus ensuring smooth airflow and maintaining the purity of the separated gas.

[0024] Preferably, the second filter screen is concentrically arranged with the air outlet pipe, and the second filter screen gradually slopes downward from the center to the edge to facilitate the sliding off of accumulated lubricating oil.

[0025] By adopting the above scheme, the inclined second filter screen allows the lubricating oil to automatically slide from the center of the filter screen to the edge under the action of gravity, further reducing the possibility of accumulation.

[0026] This invention, by employing the above technical solutions, achieves significant technical effects: Gas mixed with a small amount of lubricating oil flows through the guide sleeve to the outlet pipe. After entering the guide sleeve, the airflow direction is disrupted and the gas velocity is further reduced under the action of the turbulence-reducing component that rotates slowly with the shaft. Due to the reduced airflow velocity, oil droplets are more easily condensed, and small oil droplets continue to separate from the gas and are captured by the oil-catching component that rotates with the shaft, achieving secondary separation of gas and lubricating oil. A secondary filtration drive structure is set up, utilizing the gas flow in the inlet pipe, to re-inhale the gas that has not been sufficiently purified between the guide sleeve and the baffle for secondary filtration, and drive the shaft to rotate, so that the rotation of the shaft does not require an additional power source. After further deceleration and purification, the gas leaves the guide sleeve and is finally filtered by the second filter screen before leaving the housing through the outlet pipe. The oil removal structure rotates with the shaft, promptly scraping off the lubricating oil on the second filter screen to prevent accumulation, thereby reducing the risk of lubricating oil being carried away from the housing by the airflow. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of an oil separator in a refrigeration device according to one embodiment; Figure 2 This is a top view of an oil separator in a refrigeration device according to one embodiment; Figure 3 yes Figure 2 Sectional view at point AA; Figure 4 yes Figure 3 Enlarged view of point B in the image; Figure 5 yes Figure 4 Enlarged view of point C in the image; Figure 6 This is a front view of an oil separator in a refrigeration device according to an embodiment; Figure 7 yes Figure 6 Sectional view at DD in the middle; Figure 8 yes Figure 7 Enlarged view of point E in the image; Figure 9 This is a split view of an oil separator in a refrigeration device according to one embodiment; Figure 10 yes Figure 9 Enlarged view of point F in the image; Figure 11 yes Figure 9 Enlarged view of point G in the image.

[0028] The parts referred to by the numbers in the above attached figures are as follows: 1. Shell; 2. Inlet pipe; 3. Venturi tube section; 4. First filter; 5. Outlet pipe; 6. Second filter; 7. Baffle; 8. Shaft; 9. Guide sleeve; 10. Turbine vane; 11. Collision plane; 12. Third filter; 13. Transmission pipe; 14. Sealing box; 15. Sealing chamber; 16. Drive vane; 17. Air inlet; 18. Connecting rod; 19. Scraper; 20. Oil return pipe. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. Example

[0030] An oil separator for a refrigeration device, as described in the reference Figures 1 to 11 The device includes a housing 1, on which an inlet pipe 2 and an outlet pipe 5 are provided. A first filter 4 is provided on the inlet pipe 2, and a second filter 6 is provided on the outlet pipe 5. A baffle 7 is fixedly installed inside the housing 1, dividing the housing 1 into upper and lower parts. Gaps are provided between the baffle 7 and the housing 1, and on the baffle 7 itself, to allow the separated lubricating oil to flow through the baffle 7 to the bottom of the housing 1. A return oil pipe 20 is also provided on the housing 1, with a float valve at its bottom end. The above structures are existing structures for oil separators, and their operation is also existing technology. For details, please refer to the description in Chinese Patent Application No. 201420561375.0 in the background section; further details will not be repeated here.

[0031] A rotating shaft 8 is vertically rotatably mounted on a baffle 7 inside the housing 1. The end of the rotating shaft 8 away from the baffle 7 is rotatably connected to the housing 1 to ensure the stability of the rotation of the rotating shaft 8. The rotating shaft 8 achieves the rotatable connection between the rotating shaft 8, the baffle 7, and the housing 1 through a rotating bearing. The rotating bearing and its installation method are existing technologies and are simply illustrated in the figure, so they will not be described in detail here. The rotating bearing is available for purchase. A guide sleeve 9 is fixedly mounted inside the housing 1. One end of the guide sleeve 9 is connected to the inside of the housing 1, and the other end is connected to the gas outlet pipe 5. The guide sleeve 9 is concentrically mounted with the rotating shaft 8 and is sleeved on the outside of the rotating shaft 8. There is a gap between the inner ring wall of the guide sleeve 9 and the outer ring wall of the rotating shaft 8, and there is also a gap between the guide sleeve 9 and its lower end face and the baffle 7, allowing the gas inside the housing 1 to flow to the gas outlet pipe 5 through the guide sleeve 9.

[0032] A turbulence-deflecting blade 10 protrudes outward from the outer ring wall of the rotating shaft 8 within the guide sleeve 9. The angle between the plane of the turbulence-deflecting blade 10 and the axis of the rotating shaft 8 is an acute angle, ensuring that the turbulence-deflecting blade 10 always has a plane that directly collides with the airflow as it rotates with the rotating shaft 8, thereby changing the airflow direction. This plane is called the collision plane 11. The angle between the plane of the turbulence-deflecting blade 10 and the axis of the rotating shaft 8 can be specifically set in the same way as the arrangement between the rotating shaft and the fan blades in a fan, where the angle between the fan blade surface and the rotating shaft is an acute angle. In this embodiment, three turbulence-deflecting blades 10 are evenly spaced along the circumference of the rotating shaft 8, forming a group of turbulence-deflecting blades. Two groups of turbulence-deflecting blades are spaced apart along the axial direction of the rotating shaft 8. The angle between the plane of each turbulence-deflecting blade 10 and the axis of the rotating shaft 8 can be the same or different; in this embodiment, they are set to be the same. A third filter screen 12 is fixedly installed on the collision plane 11 of each turbulence-deflecting blade 10. The third filter screen 12 is parallel to the collision plane 11 and there is a certain distance between them.

[0033] A sealing box 14 is provided on the baffle 7 between the baffle 7 and the guide sleeve 9. The opening of the sealing box 14 faces the baffle 7, so that its bottom plate is located at the end away from the baffle 7. The opening end of the sealing box 14 is sealed and fixedly connected to the baffle 7. The sealing box 14 is concentrically arranged with the rotating shaft 8. Therefore, the bottom plate of the sealing box 14 is provided with a through groove for the rotating shaft 8 to pass through. A sealing bearing is provided between the through groove and the rotating shaft 8. The rotating shaft 8 is sealed and rotatably connected to the sealing box 14 through the sealing bearing, so that the sealing box 14, the rotating shaft 8 and the baffle 7 enclose a sealed chamber 15. The sealing bearing and the installation method of the sealing bearing are existing technologies and are simply illustrated in the figure. They will not be described in detail here. The sealing bearing can be purchased. Inside the sealed chamber 15, a drive blade 16 is provided vertically outward on the outer ring wall of the rotating shaft 8. Three drive blades 16 are evenly spaced along the circumference of the rotating shaft 8.

[0034] A Venturi tube section 3 is provided on the intake pipe 2, between the intake end of the intake pipe 2 and the first filter screen 4. The Venturi tube section 3 includes a contraction section with a gradually decreasing inner diameter, a straight section with a constant inner diameter, and an expansion section with a gradually increasing inner diameter arranged sequentially along the airflow direction. A transmission pipe 13 is provided inside the housing 1. One end of the transmission pipe 13 is sealed and connected to the straight section of the Venturi tube section 3, and the other end is sealed and connected to the sealed chamber 15. An air supply hole 17 is provided on the annular wall of the sealed box 14 to allow gas below the guide sleeve 9 to be supplied into the sealed chamber 15. The air supply hole 17 and the transmission pipe 13 are located on both sides of the single drive blade 16, and the air supply hole 17 is inclined from the outer wall of the sealed box 14 to the inner wall of the sealed box 14, gradually approaching the transmission pipe 13. The gas supplied through the air supply hole 17 flows rapidly in one direction into the transmission pipe 13 to drive the drive blade 16 and the rotating shaft 8 to rotate.

[0035] The exhaust pipe 5 and the second filter screen 6 are concentrically arranged with the rotating shaft 8. The second filter screen 6 gradually slopes downward from the center to the edge to facilitate the sliding of accumulated lubricating oil. A connecting rod 18 is provided on the end of the rotating shaft 8 away from the baffle 7. One end of the connecting rod 18 is fixed to the rotating shaft 8 and the other end is suspended. A scraper 19 is provided on the suspended end, which can scrape off the lubricating oil on the second filter screen 6 as the rotating shaft 8 rotates.

[0036] In this embodiment, a non-flammable refrigerant, such as R134a or R410A, is selected to ensure operational safety.

[0037] During operation, high-pressure oil-containing gas enters through the inlet pipe 2, undergoes initial filtration through the first filter screen 4, and then enters the housing 1. As the gas-oil mixture enters the housing 1 through the inlet pipe 2, its velocity decreases, and most oil droplets separate from the gas. Under gravity, these droplets flow past the baffle 7 to the bottom of the housing 1. The gas mixed with a small amount of lubricating oil flows through the guide sleeve 9 to the outlet pipe 5. As the gas enters the guide sleeve 9, its flow direction changes and its velocity decreases under the influence of the rotating baffle vanes 10 and the third filter screen 12. Oil droplets condense and are captured, and the de-velocated and purified gas is discharged through the second filter screen 6 and the outlet pipe 5. Meanwhile, the high-speed airflow in the intake pipe 2 generates negative pressure through the Venturi tube section 3, drawing gas from the sealed chamber 15 through the transmission pipe 13, creating negative pressure in the sealed chamber 15. Gas that has not been sufficiently purified between the guide sleeve 9 and the baffle 7 then flows rapidly into the sealed chamber 15 through the air inlet 17, impacting the drive vane 16 and causing the rotating shaft 8 to rotate. The drawn gas is then filtered again through the first filter screen 4. The rotation of the rotating shaft 8 drives the turbulence vane 10 to work, and simultaneously drives the scraper 19 through the connecting rod 18 to continuously scrape off the lubricating oil accumulated on the second filter screen 6. The lubricating oil collects at the bottom of the housing 1 and eventually returns to the compressor.

[0038] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. An oil separator for a refrigeration device, comprising a housing (1), an inlet pipe (2) and an outlet pipe (5) disposed on the housing (1), and a baffle (7) fixedly disposed inside the housing (1) for the passage of lubricating oil, wherein a first filter screen (4) is disposed on the inlet pipe (2) and a second filter screen (6) is disposed on the outlet pipe (5), characterized in that: The housing (1) is equipped with a speed-reducing oil-catching structure, which includes a rotating shaft (8) rotatably mounted on a baffle (7) inside the housing (1) and a guide sleeve (9) fixed inside the housing (1) and concentrically sleeved outside the rotating shaft (8) to allow gas flow from the housing (1) to the outlet pipe (5). Inside the guide sleeve (9) on the rotating shaft (8), there is a turbulence-reducing component that disrupts the gas flow direction inside the guide sleeve (9) to reduce speed, and an oil-catching component that captures the oil in the reduced gas flow. The oil-catching component for secondary gas-oil separation is provided between the housing (1) and the air inlet pipe (2). This structure re-filters the gas that has not entered the guide sleeve (9) back into the air inlet pipe (2) for re-filtration while driving the rotating shaft (8) to rotate. The opening and closing of the re-filtering drive structure is controlled by the flow or stillness of the gas in the air inlet pipe (2). An oil removal structure is provided between the rotating shaft (8) and the second filter screen (6) to reduce the accumulation of lubricating oil on the second filter screen (6) as the rotating shaft (8) rotates.

2. The oil separator for a refrigeration device according to claim 1, characterized in that: The turbulence reduction assembly includes a turbulence vane (10) protruding outward on the outer ring wall of the rotating shaft (8). The angle between the plane of the turbulence vane (10) and the axis of the rotating shaft (8) is an acute angle, so that when the turbulence vane (10) rotates with the rotating shaft (8), there is always a plane that directly collides with the airflow to change the airflow direction. The plane on the turbulence vane (10) that directly collides with the airflow is called the collision plane (11).

3. The oil separator for a refrigeration device according to claim 2, characterized in that: At least one spoiler (10) is provided at intervals on the outer ring wall of the rotating shaft (8).

4. The oil separator for a refrigeration device according to claim 2, characterized in that: The oil capture assembly includes a third filter (12) fixedly disposed on the collision plane (11) of the turbulence vane (10), the third filter (12) being parallel to the collision plane (11) and having a gap between them.

5. The oil separator for a refrigeration device according to claim 1, characterized in that: The secondary filter drive structure includes a Venturi tube section (3) disposed on the intake pipe (2) and between the intake end of the intake pipe (2) and the first filter screen (4), a transmission pipe (13) with one end sealed and connected to the Venturi tube section (3) and the other end located between the guide sleeve (9) and the baffle (7), and a transmission structure disposed between the transmission pipe (13) and the rotating shaft (8) to drive the rotating shaft (8) to rotate when the airflow flows through the Venturi tube section (3).

6. The oil separator for a refrigeration device according to claim 5, characterized in that: The transmission structure includes a sealed box (14) with its opening facing the baffle (7) and concentrically arranged with the rotating shaft (8). The opening end of the sealed box (14) is sealed and fixed with the baffle (7), and the bottom plate of the sealed box (14) allows the rotating shaft (8) to pass through and rotate in a sealed manner. A sealed chamber (15) is formed between the sealed box (14), the rotating shaft (8), and the baffle (7), and the sealed chamber (15) is sealed and connected to the end of the transmission pipe (13) away from the air inlet pipe (2). A replenishing air rotation structure is provided between the rotating shaft (8) and the sealed box (14) to replenish air in the sealed chamber (15) and drive the rotating shaft (8) to rotate when the air in the sealed chamber (15) is sucked into the air inlet pipe (2) through the transmission pipe (13).

7. The oil separator for a refrigeration device according to claim 6, characterized in that: The air-filling rotating structure includes a drive blade (16) that protrudes vertically outward on the outer ring wall of the rotating shaft (8) inside the sealed chamber (15), and an air-filling hole (17) provided on the ring wall of the sealed box (14) for the gas between the guide sleeve (9) and the baffle (7) to fill the sealed chamber (15) and flow rapidly in one direction into the transmission pipe (13) to drive the drive blade (16) and the rotating shaft (8) to rotate.

8. The oil separator for a refrigeration device according to claim 7, characterized in that: The air inlet (17) and the transmission pipe (13) are located on both sides of a single drive blade (16), and the air inlet (17) is arranged in an inclined manner from the outer wall of the sealing box (14) to the inner wall of the sealing box (14) and gradually approaches the transmission pipe (13).

9. An oil separator for a refrigeration device according to claim 1, characterized in that: The oil removal structure includes a connecting rod (18) with one end fixed on the rotating shaft (8) and the other end suspended, and a scraper (19) provided on the suspended end of the connecting rod (18) that rotates with the rotating shaft (8) to scrape off the lubricating oil on the second filter screen (6).

10. An oil separator for a refrigeration device according to claim 1, characterized in that: The second filter (6) is concentrically arranged with the air outlet pipe (5), and the second filter (6) gradually slopes downward from the center to the edge to facilitate the sliding of accumulated lubricating oil.

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