Multi-attitude oil-gas separator and oil-gas separation method

Abstract

This invention provides a multi-attitude oil-gas separator and an oil-gas separation method, belonging to the technical field of aircraft components. The multi-attitude oil-gas separator includes a primary separation cylinder, a secondary separation cylinder, a cyclone separator, a cover plate, an oil return pipe, an ejector pipe, a ventilation pipe, and an air vent pipe. This multi-attitude oil-gas separator can directly supply oil to transmission components during multi-attitude flight of the aircraft, and simultaneously utilizes pressure difference to eject lubricating oil from the oil tank through the ejector structure as a supplement, thereby effectively solving the risk of oil supply interruption under extreme attitudes, ensuring the continuous normal operation of the lubricating oil system, and providing reliable lubrication and cooling for transmission components. Furthermore, this multi-attitude oil-gas separator significantly improves separation efficiency by performing two separations of the oil-gas mixture, and has high engineering application value.

Description

Technical Field

[0001] This invention belongs to the field of aircraft component technology, and relates to an oil-gas separator suitable for aero engines, specifically a multi-attitude oil-gas separator and an oil-gas separation method. Background Technology

[0002] Aircraft engines contain numerous high-speed rotating components that generate significant heat during operation, requiring lubricating oil for cooling and lubrication. In open-type engines, air can mix with the lubricating oil during lubrication, forming an oil-air mixture that significantly reduces lubrication and cooling efficiency. Therefore, an oil-air separator is necessary in the oil return line.

[0003] As modern fighter jets evolve towards higher maneuverability and increasingly complex flight attitudes, higher demands are placed on the oil supply capacity of the lubrication system. When the aircraft is in a normal flight attitude, the oil tank inlet is below the fluid level, and the oil pump can stably draw oil. However, when the aircraft performs high-maneuvering maneuvers such as large-angle rolls, dives, or inverted flight, the oil level tilts significantly, causing the inlet to be exposed above the fluid level, resulting in an interruption of oil supply and potentially damaging transmission components. Therefore, the lubrication system's ability to continuously supply oil in various attitudes directly determines the engine's reliability under high-maneuvering conditions.

[0004] Multi-position oil-gas separators, combining efficient oil-gas separation with continuous fuel supply in multiple orientations, have become a key direction in aero-engine development. A crucial difference between existing oil-gas separators and multi-position oil-gas separators lies in their position relative to the fuel tank, which is also a vital aspect of achieving multi-position fuel supply: such as... Figure 1 As shown, the existing oil-gas separator is relatively independent of the oil tank; while Figure 2 The multi-attitude oil-gas separator shown is integrated inside the fuel tank, which facilitates air intake from the tank and enables multi-attitude fuel supply. Currently, research mainly focuses on improving oil-gas separation efficiency, with limited research on fuel supply under multi-attitude conditions. While existing multi-attitude oil-gas separator designs integrate the separator inside the fuel tank, they still have shortcomings in practical applications: their suction port layout design under extreme attitudes is not reasonable enough; when the lubricating oil in the tank experiences significant sloshing or rapid changes in the liquid level, the suction port may still be briefly exposed or experience air intake, leading to fuel supply pulsation or even interruption. Furthermore, a good balance is not achieved between oil-gas separation efficiency and multi-attitude adaptability; the separated gas is not discharged smoothly and easily forms air resistance within the fuel tank, affecting fuel supply stability. Therefore, existing structures cannot fully meet the stringent requirements of continuous and stable fuel supply for the lubricating oil system under high-maneuverability flight conditions. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a multi-attitude oil-gas separator and an oil-gas separation method, thereby solving the technical problem that traditional lubrication systems cannot continuously supply oil to transmission components during multi-attitude flight of aircraft, which can easily lead to damage to the transmission components.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A multi-position oil-gas separator includes a primary separation cylinder with an annular bottom plate with a central opening at the bottom and its top closed by a cover plate; a secondary separation cylinder is coaxially arranged inside the primary separation cylinder, with both its top and bottom open; a cyclone separator is provided at the top of the secondary separation cylinder, and the cyclone separator is located below the cover plate.

[0007] The space between the primary separation cylinder, the secondary separation cylinder, and the hydrocyclone is the primary separation chamber; the cylindrical cavity inside the secondary separation cylinder is the secondary separation chamber.

[0008] A return oil pipe is fixedly installed on one side of the primary separation cylinder. One end of the return oil pipe is an oil inlet and is connected to the outside, while the other end of the return oil pipe is an oil outlet and is connected to the primary separation chamber.

[0009] Multiple ejector tubes are evenly distributed along the circumferential direction on the cover plate; one end of the ejector tube is an oil inlet, which passes through the cover plate and is connected to the primary separation chamber and the secondary separation chamber through the cyclone separator; the other end of the ejector tube is an oil outlet, which is used to introduce the lubricating oil ejected into the oil tank into the cyclone separator.

[0010] A ventilation pipe is coaxially arranged at the center of the top of the secondary separation cylinder, with both its top and bottom ends open. The bottom of the ventilation pipe passes through a cover plate and a cyclone separator in sequence, with its bottom end serving as an air inlet and connected to the secondary separation chamber. The top end of the ventilation pipe serves as an air outlet and connects to the outside. Multiple air intake pipes are evenly distributed along the circumferential direction on the cover plate, with multiple air intake pipes and multiple ejector pipes arranged alternately. One end of the air intake pipe serves as an air inlet, passes through the cover plate and the cyclone separator in sequence, and connects to the primary separation chamber. The other end of the air intake pipe serves as an air outlet and connects to the ventilation pipe.

[0011] The present invention also has the following technical features: Specifically, the ventilation duct is provided with multiple ventilation holes evenly distributed along the circumferential direction, and each hole corresponds to an air intake pipe; the air intake pipe is connected to the ventilation duct through the ventilation holes.

[0012] Specifically, the cyclone separator includes a cyclone plate, and multiple sets of lubricating oil channels are evenly distributed along the circumferential direction on the edge of the cyclone plate; each set of lubricating oil channels includes an ejector lubricating oil channel and a primary lubricating oil channel; the radially outer end of the primary lubricating oil channel is the first oil inlet and is connected to the primary separation chamber, the radially inner end of the primary lubricating oil channel is the second oil inlet and is connected to the secondary separation chamber; the middle end of the primary lubricating oil channel is the oil outlet and is connected to the ejector lubricating oil channel of the same set, and the ejector lubricating oil channel is provided with the oil inlet of the ejector tube.

[0013] Specifically and in an optimized manner, the cross-section of the primary lubricating oil channel gradually increases from the radial outer end to the radial inner end.

[0014] Specifically, the edge of the swirl plate is evenly provided with multiple air intake holes along the circumferential direction, and the multiple air intake holes and multiple sets of lubricating oil channels are arranged alternately; the air intake holes are provided with air outlets of air intake pipes.

[0015] Specifically, an oil collection chamber is provided below the primary separation cylinder, with its side wall being an inverted conical cylinder wall, its top being an annular top plate with a central opening, and its bottom being an annular bottom plate with a central opening; the bottom of the secondary separation cylinder extends beyond the bottom of the primary separation cylinder and into the oil collection chamber; a connector is coaxially provided at the center of the oil collection chamber, with the top of the connector located inside the bottom of the secondary separation cylinder.

[0016] Specifically, the bottom of the connector is open and flush with the center hole of the oil receiving tank bottom plate, and the top of the connector is a flat circular top plate with multiple connector through holes; the connector through holes are connected to the secondary separation chamber and the inner cavity of the connector.

[0017] Specifically, the space between the oil collection tank, the connector, and the secondary separation cylinder is the oil collection chamber; the bottom end of the secondary separation cylinder is the oil outlet and is connected to the oil collection chamber; an oil supply pipe is fixedly installed on one side of the oil collection tank, one end of the oil supply pipe is the oil inlet and is connected to the oil collection chamber, and the other end of the oil supply pipe is the oil outlet and is connected to the outside.

[0018] This invention also protects an oil-gas separation method, which employs the multi-position oil-gas separator described above; the method includes the following steps: Step 1, Introduce lubricating oil: Install the multi-position oil-gas separator inside the oil tank. The lubricating oil is drawn in by the return oil pump and enters the primary separation chamber from the oil tank through the return oil pipe.

[0019] Step two: The lubricating oil and entrained gas that entered the primary separation chamber in step one undergo the first oil-gas separation in the primary separation chamber: Under the action of centrifugal force, the denser lubricating oil is thrown towards the chamber wall. Due to the continuous entry of oil-gas mixture from the swirling flow and the return oil port, it moves upward against gravity and enters the secondary separation chamber through the cyclone separator. The less dense gas gathers towards the center and enters the ventilation pipe through the air inlet.

[0020] Step 3: The primary separation chamber and the secondary separation chamber are connected by a hydrocyclone. The hydrocyclone has a primary lubricating oil channel, which connects the primary separation chamber, the secondary separation chamber and the ejector tube. Under the action of pressure difference, the lubricating oil drawn up by the ejector tube and the oil-gas mixture after primary separation enter the secondary separation chamber together.

[0021] Step four: The gases separated in steps two and three are discharged in an orderly manner: A ventilation pipe is installed at the top of the primary separation chamber, and the gas siphon pipe connects the top of the primary separation chamber to the ventilation pipe. The gas gathered at the top of the primary separation chamber flows into the ventilation pipe through the gas siphon pipe. At the same time, the gas separated in the secondary separation chamber also gathers into the ventilation pipe. The ventilation pipe guides the gas to the gas phase space of the oil tank or the external environment to avoid the gas from accumulating in the separator or oil tank and forming gas resistance, thus ensuring that the lubricating oil in the oil supply line is continuous and pulsation-free.

[0022] Step 5, oil removal: The lubricating oil separated in the secondary separation chamber is collected at the bottom and drawn by the oil supply pump through the oil supply pipe, and then supplied to the transmission components of the aircraft.

[0023] Specifically, for the ejector tube to perform its ejection function, it must satisfy the following equation VI: Formula VI.

[0024] In the formula: P0 represents the ambient pressure, P1 represents the pressure at the inlet of the diffuser section of the ejector tube, k represents the expansion area ratio of the diffuser section of the ejector tube, that is, the ratio of the outlet cross-sectional area to the inlet cross-sectional area of ​​the diffuser section, ρ represents the lubricating oil density, V2 represents the outlet velocity of the diffuser section of the ejector tube, g represents the gravitational acceleration, and h represents the ejection height.

[0025] Compared with the prior art, the present invention has the following technical effects: The multi-attitude oil-gas separator of this invention consists of a separation cylinder, a ventilation pipe, a connector, and an ejector. This structure can directly supply oil to the transmission components during multi-attitude flight of an aircraft, and simultaneously utilize the pressure difference to eject lubricating oil from the oil tank as a supplement, thereby effectively solving the risk of oil supply interruption under extreme attitudes, ensuring the continuous normal operation of the lubricating oil system, and providing reliable lubrication and cooling for the transmission components. Furthermore, this structure significantly improves separation efficiency by performing two separations of the oil-gas mixture, and has high engineering application value. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of a traditional lubricating oil system.

[0027] Figure 2 This is a schematic diagram of the overall structure of a multi-position lubrication system.

[0028] Figure 3 This is a schematic diagram of the overall structure of the multi-position oil-gas separator of the present invention.

[0029] Figure 4 This is a schematic diagram of the vortex chamber of the present invention.

[0030] Figure 5 This is a schematic diagram of the cover plate and ejector tube of the present invention.

[0031] Figure 6 This is a schematic diagram of the structure of the connector of the present invention.

[0032] The meanings of the labels in the diagram are as follows: 1-first-stage separation cylinder, 2-cover plate, 3-second-stage separation cylinder, 4-cyclone separator, 5-first-stage separation chamber, 6-oil return pipe, 7-ejector pipe, 8-second-stage separation chamber, 9-ventilation pipe, 10-air intake pipe, 11-oil collection tank, 12-connector, 13-connector through hole, 14-oil collection chamber, 15-oil supply pipe, 16-ventilation hole.

[0033] Swirl plate 401-, air vent 402-, oil ejector channel 403-, primary oil channel 404-.

[0034] The specific content of the present invention will be further explained in detail below with reference to the embodiments. Detailed Implementation

[0035] It should be noted that, unless otherwise specified, all components in this invention are components known in the art.

[0036] Following the above technical solutions, specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent modifications made based on the technical solutions of this application fall within the protection scope of the present invention.

[0037] Example 1: This embodiment provides a multi-position oil-gas separator, such as... Figures 3 to 6 As shown, it includes a primary separation cylinder 1, with an annular bottom plate with a central opening at the bottom end and its top end closed by a cover plate 2; a secondary separation cylinder 3 is coaxially arranged inside the primary separation cylinder 1, with both its top and bottom ends open; a hydrocyclone 4 is provided at the top end of the secondary separation cylinder 3, and the hydrocyclone 4 is located below the cover plate 2.

[0038] The space between the primary separation cylinder 1, the secondary separation cylinder 3, and the hydrocyclone 4 is the primary separation chamber 5; the cylindrical cavity inside the secondary separation cylinder 3 is the secondary separation chamber 8.

[0039] A return oil pipe 6 is fixedly installed on one side of the primary separation cylinder 1. One end of the return oil pipe 6 is an oil inlet and is connected to the outside, while the other end of the return oil pipe 6 is an oil outlet and is connected to the primary separation chamber 5.

[0040] Multiple ejector tubes 7 are evenly distributed along the circumferential direction on the cover plate 2; one end of the ejector tube 7 is the oil inlet, which passes through the cover plate 2 and is connected to the primary separation chamber 5 and the secondary separation chamber 8 through the hydrocyclone 4, so that the ejected lubricating oil and the oil-gas mixture after primary separation enter the secondary separation chamber 8 together; the other end of the ejector tube 7 is the oil outlet, which is used to introduce the lubricating oil ejected into the oil tank into the hydrocyclone 4.

[0041] A ventilation pipe 9 is coaxially arranged at the center of the top of the secondary separation cylinder 3, with both its top and bottom ends open. The bottom of the ventilation pipe 9 passes through the cover plate 2 and the cyclone separator 4 in sequence, and its bottom end is the air inlet and is connected to the secondary separation chamber 8. The top end of the ventilation pipe 9 is the air outlet and is connected to the outside. Multiple air intake pipes 10 are evenly arranged along the circumferential direction on the cover plate 2, and multiple air intake pipes 10 and multiple ejector pipes 7 are arranged alternately. One end of the air intake pipe 10 is the air inlet, passes through the cover plate 2 and the cyclone separator 4 in sequence, and is connected to the primary separation chamber 5. The other end of the air intake pipe 10 is the air outlet and is connected to the ventilation pipe 9.

[0042] As a specific embodiment, the ventilation pipe 9 is provided with a plurality of ventilation holes 16 evenly distributed along the circumferential direction, and each hole corresponds to an air intake pipe 10; the air intake pipe 10 is connected to the ventilation pipe 9 through the ventilation holes 16.

[0043] As a specific embodiment, the cyclone separator 4 includes a cyclone plate 401, and multiple sets of lubricating oil channels are evenly distributed along the circumferential direction on the edge of the cyclone plate 401; each set of lubricating oil channels includes an ejector lubricating oil channel 403 and a primary lubricating oil channel 404; the radial outer end of the primary lubricating oil channel 404 is a first oil inlet and is connected to the primary separation chamber 5, the radial inner end of the primary lubricating oil channel 404 is a second oil inlet and is connected to the secondary separation chamber 8; the middle end of the primary lubricating oil channel 404 is an oil outlet and is connected to the ejector lubricating oil channel 403 of the same set, and the ejector lubricating oil channel 403 is provided with an oil inlet of an ejector tube 7.

[0044] As a specific embodiment, the cross-section of the primary lubricating oil channel 404 gradually increases from the radial outer end to the radial inner end.

[0045] As a specific embodiment, the edge of the swirl plate 401 is evenly provided with a plurality of air intake holes 402 along the circumferential direction, and the plurality of air intake holes 402 and a plurality of sets of lubricating oil channels are arranged alternately; the air intake hole 402 is provided with an air outlet of the air intake pipe 10.

[0046] As a specific embodiment, an oil collection chamber 11 is provided below the primary separation cylinder 1. Its side wall is an inverted conical cylinder wall, its top end is an annular top plate with a central opening, and its bottom end is an annular bottom plate with a central opening. The bottom of the secondary separation cylinder 3 extends out of the bottom end of the primary separation cylinder 1 and into the oil collection chamber 11. A connector 12 is coaxially provided at the center of the oil collection chamber 11, and the top of the connector 12 is located inside the bottom of the secondary separation cylinder 3.

[0047] As a specific embodiment, the bottom end of the connector 12 is open and flush with the center hole of the bottom plate of the oil receiving tank 11. The top end of the connector 12 is a flat circular top plate with multiple connector through holes 13. The connector through holes 13 are connected to the secondary separation chamber 8 and the inner cavity of the connector 12.

[0048] As a specific embodiment, the space between the oil collection tank 11, the connector 12, and the secondary separation cylinder 3 is the oil collection chamber 14; the bottom end of the secondary separation cylinder 3 is the oil outlet and is connected to the oil collection chamber 14; an oil supply pipe 15 is fixedly installed on one side of the oil collection tank 11, one end of the oil supply pipe 15 is the oil inlet and is connected to the oil collection chamber 14, and the other end of the oil supply pipe 15 is the oil outlet and is connected to the outside.

[0049] As a specific embodiment, the number of air intake pipe 10, ejector lubricating oil channel 403, and primary lubricating oil channel 404 are all six.

[0050] As a specific embodiment, the number of connector through holes 13 is four.

[0051] The working process and principle of this invention are as follows: This invention mainly consists of a ventilation pipe 9, an air intake pipe 10, an ejector pipe 7, a cover plate 2, a cyclone separator 4, a primary separation cylinder 1, a secondary separation cylinder 3, an oil collection tank 11, and a connector 12. The primary separation cylinder 1 and the secondary separation cylinder 3 are composed of two cylinders nested together, with the secondary separation cylinder 3 inside the primary separation cylinder 1, forming two cavities.

[0052] The hydrocyclone 4 is located above the primary separation cylinder 1 and the secondary separation cylinder 3. The hydrocyclone 4 primarily provides channels for the lubricating oil and air after primary oil-gas separation, as well as the lubricating oil ejected from the oil tank, to enter the secondary separation chamber 8. The overall structure of the hydrocyclone 4 is a thick plate with multiple primary lubricating oil channels 404, ejected lubricating oil channels 403, and air vents 402. The ejected lubricating oil channel 403 is located on one side of the primary lubricating oil channel 404. Lubricating oil from the ejector pipe 7 enters the primary lubricating oil channel 404 through the ejected lubricating oil channel 403 and then flows into the secondary separation chamber 8. The primary lubricating oil channel 404 gradually expands from the outer ring towards the center. This design aims to create a pressure difference between the ejected channel area and the oil tank, thereby achieving the ejection function.

[0053] Ventilation pipe 9 and air intake pipe 10 are connected. After the oil-gas mixture is separated in the primary separation chamber 5, air enters the ventilation pipe 9 through the air intake pipe 10 and then exits. The oil-gas mixture after primary oil-gas separation enters the secondary separation chamber 8, where oil-gas separation occurs again. Due to centrifugal force, the separated lubricating oil is thrown towards the wall, while the air remains in the center. In addition, the lubricating oil flows downward along the wall under the influence of gravity, while the air flows upward in the center, enters the ventilation pipe 9, and then exits.

[0054] The cover plate 2 is located above the primary separator cylinder 1, the secondary separator cylinder 3, and the hydrocyclone 4. The cover plate 2 is connected to the ejector tube 7. The cover plate 2 has holes for the ventilation pipe 9, the ejector tube 7, and the air duct 10. The ventilation pipe 9 passes through the cover plate 2 and enters the interior of the secondary separator cylinder 3. The ejector tube 7 passes through the cover plate 2 and corresponds to the oil ejection channel 403 of the hydrocyclone 4. The air duct 10 passes through the cover plate 2 and corresponds to the air duct hole 402 of the hydrocyclone 4.

[0055] The oil collection tank 11 is located below the primary separation cylinder 1 and the secondary separation cylinder 3. The oil collection tank 11 is connected to the connector 12 and has an oil supply pipe 15 through which the separated lubricating oil is discharged. The oil collection tank 11 mainly serves to collect the separated lubricating oil and then supply it to the transmission components. The connector 12 is a cylinder with a closed top surface and four symmetrical holes. The connector 12 mainly serves to replenish oil. When the lubricating oil level inside the oil-gas separator is higher than the oil level inside the oil tank, the lubricating oil flows from the oil-gas separator into the oil tank through the connector 12. When the lubricating oil level inside the oil-gas separator is lower than the oil level inside the oil tank, the lubricating oil flows from the oil tank into the oil-gas separator through the connector 12.

[0056] The ejector function of the multi-position oil-gas separator is jointly achieved by the hydrocyclone 4 and the ejector tube 7. Through sudden expansion and the diffusion section, a low-pressure zone is formed inside the primary lubricating oil channel 404 of the hydrocyclone 4, with a pressure lower than that inside the oil tank, ultimately ejecting the lubricating oil into the oil-gas separator. The ejector function is only possible due to the existence of this pressure difference. The theoretical analysis of the specific implementation of the ejector function is as follows: The known parameters are as follows: inlet velocity V1, pressure P1, outlet velocity V2, pressure P2, expansion area ratio k, and ambient pressure P0.

[0057] From Bernoulli's equation, we get: Formula I.

[0058] From the continuity equation, we get: Formula II.

[0059] From the above equation, we can obtain: Formula III.

[0060] According to the pressure on the curved surface: Formula IV.

[0061] Assuming the density of the medium remains constant before and after exiting the separator, we can obtain: Formula V.

[0062] In order to achieve a pressure difference P0 > P1, that is: k>1.414 The magnitude of the pressure difference determines the height of the ejector oil: Formula VI.

[0063] The above formula derivation shows that the formation of the pressure difference determines that the diffusion area ratio is greater than 1.414. In addition, successful ejection requires satisfying Equation VI.

[0064] The oil-gas mixture enters the primary separation chamber 5 from the return oil at a certain tangential velocity and rotates upward along the wall. Due to centrifugal force, the lubricating oil is thrown towards the outer wall of the primary separation chamber 5, while the air remains on the inner wall. The oil-gas mixture continuously enters the primary separation chamber 5 from the return oil pipe 6. Under the action of compression and inertia, the oil-gas mixture, the separated lubricating oil, and the air entering the primary separation chamber 5 move upward. The separated air enters the ventilation pipe 9 through the air intake pipe 10 and then exits the oil-gas separator. The separated lubricating oil and the unseparated oil-gas mixture enter the secondary separation chamber 8 through the primary lubricating oil channel 404.

[0065] The ejector structure, consisting of ejector tube 7 and cyclone separator 4, can eject lubricating oil from the oil tank along ejector tube 7 to the ejector lubricating oil channel 403. Therefore, the ejected lubricating oil mixes with the oil-gas mixture after primary oil-gas separation in the primary lubricating oil channel 404 and enters the secondary separation chamber 8 together. Upon entering the secondary separation chamber 8, due to the density difference between lubricating oil and air, the denser lubricating oil is thrown to the wall, while the less dense air is squeezed towards the center, thus separating the lubricating oil from the air. The air moves upward and is discharged through ventilation pipe 9, while the lubricating oil moves downward and enters the bottom. The lubricating oil after secondary separation is collected at the bottom and directly drawn by the oil supply pump through the bottom oil supply pipe 15, supplying the lubricating oil to the transmission components.

Claims

1. A multi-attitude oil and gas separator, characterized by, It includes a primary separation cylinder (1), with an annular bottom plate with a central opening at the bottom and its top closed by a cover plate (2); a secondary separation cylinder (3) is coaxially arranged inside the primary separation cylinder (1), with both its top and bottom open; a hydrocyclone (4) is provided at the top of the secondary separation cylinder (3), and the hydrocyclone (4) is located below the cover plate (2); The space between the primary separation cylinder (1), the secondary separation cylinder (3), and the hydrocyclone (4) is the primary separation chamber (5); the cylindrical cavity inside the secondary separation cylinder (3) is the secondary separation chamber (8). A return oil pipe (6) is fixedly installed on one side of the primary separation cylinder (1). One end of the return oil pipe (6) is an oil inlet and is connected to the outside. The other end of the return oil pipe (6) is an oil outlet and is connected to the primary separation chamber (5). Multiple ejector tubes (7) are evenly distributed along the circumferential direction on the cover plate (2); one end of the ejector tube (7) is the oil inlet, which passes through the cover plate (2) and is connected to the primary separation chamber (5) and the secondary separation chamber (8) through the hydrocyclone (4); the other end of the ejector tube (7) is the oil outlet, which is used to introduce the lubricating oil ejected into the oil tank into the hydrocyclone (4). A ventilation pipe (9) is coaxially arranged at the center of the top of the secondary separation cylinder (3), with both the top and bottom ends open; the bottom of the ventilation pipe (9) passes through the cover plate (2) and the cyclone separator (4) in sequence, and its bottom end is the air inlet and is connected to the secondary separation chamber (8); the top end of the ventilation pipe (9) is the air outlet and is connected to the outside; multiple air intake pipes (10) are evenly arranged along the circumferential direction on the cover plate (2), and multiple air intake pipes (10) and multiple ejector pipes (7) are arranged alternately; one end of the air intake pipe (10) is the air inlet, passes through the cover plate (2) and the cyclone separator (4) in sequence and is connected to the primary separation chamber (5); the other end of the air intake pipe (10) is the air outlet and is connected to the ventilation pipe (9).

2. The multiattitude oil and gas separator of claim 1 wherein, The ventilation pipe (9) is evenly provided with multiple ventilation holes (16) along the circumferential direction, and each hole corresponds to an air intake pipe (10); the air intake pipe (10) is connected to the ventilation pipe (9) through the ventilation holes (16).

3. The multi-position oil-gas separator as described in claim 1, characterized in that, The cyclone separator (4) includes a cyclone plate (401), and multiple sets of lubricating oil channels are evenly distributed along the circumferential direction on the edge of the cyclone plate (401). Each set of lubricating oil channels includes an ejector lubricating oil channel (403) and a primary lubricating oil channel (404). The radial outer end of the primary lubricating oil channel (404) is the first oil inlet and is connected to the primary separation chamber (5). The radial inner end of the primary lubricating oil channel (404) is the second oil inlet and is connected to the secondary separation chamber (8). The middle end of the primary lubricating oil channel (404) is the oil outlet and is connected to the ejector lubricating oil channel (403) of the same set. The ejector lubricating oil channel (403) is provided with the oil inlet of the ejector tube (7).

4. The multi-position oil-gas separator as described in claim 3, characterized in that, The cross-section of the primary lubricating oil channel (404) gradually increases from the radial outer end to the radial inner end.

5. The multi-position oil-gas separator as described in claim 3, characterized in that, The edge of the swirl plate (401) is evenly provided with multiple air inlets (402) along the circumferential direction, and the multiple air inlets (402) and multiple sets of lubricating oil channels are arranged alternately; the air outlet of the air inlet pipe (10) is provided in the air inlet (402).

6. The multi-position oil-gas separator as described in claim 1, characterized in that, Below the primary separation cylinder (1) is an oil collection chamber (11), whose side wall is an inverted conical cylinder wall, whose top end is an annular top plate with a central opening, and whose bottom end is an annular bottom plate with a central opening; the bottom of the secondary separation cylinder (3) extends out of the bottom end of the primary separation cylinder (1) and into the oil collection chamber (11); a connector (12) is coaxially arranged at the center of the oil collection chamber (11), and the top of the connector (12) is located inside the bottom of the secondary separation cylinder (3).

7. The multi-position oil-gas separator as described in claim 5, characterized in that, The bottom of the connector (12) is open and flush with the center hole of the bottom plate of the oil receiving tank (11). The top of the connector (12) is a flat circular top plate with multiple connector through holes (13) on the top plate. The connector through holes (13) are connected to the secondary separation chamber (8) and the inner cavity of the connector (12).

8. The multi-position oil-gas separator as described in claim 5, characterized in that, The space between the oil collection tank (11), the connector (12), and the secondary separation cylinder (3) is the oil collection chamber (14); the bottom end of the secondary separation cylinder (3) is the oil outlet and is connected to the oil collection chamber (14); an oil supply pipe (15) is fixedly installed on one side of the oil collection tank (11), one end of the oil supply pipe (15) is the oil inlet and is connected to the oil collection chamber (14), and the other end of the oil supply pipe (15) is the oil outlet and is connected to the outside.

9. A method for separating oil and gas, characterized in that, The method is implemented using a multi-position oil-gas separator as described in any one of claims 1 to 8.

10. The oil-gas separation method as described in claim 9, characterized in that, The method includes the following steps: Step 1, introduce lubricating oil: install the multi-position oil-gas separator inside the oil tank. The lubricating oil is drawn in by the return oil pump and enters the first-stage separation chamber (5) from the oil tank through the return oil pipe (6). Step 2: The lubricating oil and entrained gas that entered the primary separation chamber (5) in Step 1 are separated into oil and gas for the first time in the primary separation chamber (5): Under the action of centrifugal force, the lubricating oil with higher density is thrown towards the chamber wall. Due to the continuous entry of oil and gas mixture from the swirling flow and the return oil port, it moves upward against gravity and enters the secondary separation chamber (8) through the swirler (4). The gas with lower density gathers towards the center and enters the ventilation pipe (9). Step 3: The primary separation chamber (5) and the secondary separation chamber (8) are connected through a hydrocyclone (4). Under the action of pressure difference, the lubricating oil drawn up by the ejector tube (7) and the oil-gas mixture after primary separation enter the secondary separation chamber (8) together. Step 4: The gases separated in Step 2 and Step 3 are discharged in an orderly manner: A ventilation pipe (9) is provided at the top of the primary separation chamber (5), and the gas siphon pipe (10) connects the top of the primary separation chamber (5) with the ventilation pipe (9). The gas gathered at the top of the primary separation chamber (5) flows into the ventilation pipe (9) through the gas siphon pipe (10); at the same time, the gas separated in the secondary separation chamber (8) also gathers into the ventilation pipe (9); the ventilation pipe (9) guides the gas to the gas phase space of the oil tank or the external environment, so as to avoid the gas from accumulating in the separator or oil tank and forming gas resistance, and to ensure that the lubricating oil in the oil supply line is continuous and without pulsation; Step 5, remove lubricating oil: The lubricating oil separated by the secondary separation chamber (8) is collected at the bottom and drawn by the oil supply pump through the oil supply pipe (15), and then supplied to the transmission components of the aircraft.

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