Centrifugal dynamic pressure composite cooperative aero-engine oil-gas separator structure and method

Abstract

This invention discloses a centrifugal-dynamic-pressure combined synergistic structure and method for an aero-engine oil-gas separator, belonging to the technical field of aero-engine lubricating oil systems. The separator includes a separator mounting base, an outer stationary cylinder, an inner rotating cylinder, a fixed tangential vortex generator, a drive shaft, a vent pipe assembly, and a cone. The inner rotating cylinder is driven to rotate at high speed by the drive shaft, and its cylinder wall has micropores; the outer stationary cylinder is coaxially arranged with it, forming a dynamic-static separation chamber. The oil-gas mixture is transformed into a tangential vortex by the fixed tangential vortex generator and enters the inner rotating cylinder. Under the action of centrifugal force, oil droplets penetrate the micropores and enter the dynamic-static separation chamber, where they are captured by the outer stationary cylinder, while the gas accumulates at the shaft center and is discharged through the vent pipe. This invention achieves efficient, low-pressure-drop, and highly reliable oil-gas separation under all operating conditions through the organic synergy of centrifugal separation and dynamic-pressure screening, making it particularly suitable for aero-engine lubricating oil systems.

Description

Technical Field

[0001] This invention belongs to the technical field of aero-engine lubricating oil systems, specifically relating to a structure and method for an oil-gas separator used in aero-engines, particularly a centrifugal separator based on... A high-efficiency oil-gas separator with combined dynamic and pressure effects. Background Technology

[0002] In modern aircraft engines, the lubrication system produces an oil-gas mixture after lubricating and cooling critical components such as high-speed bearings and gears. If this mixture is not effectively separated before exiting the engine, it will lead to excessive oil consumption, environmental pollution, and potential blockage of ventilation lines, affecting engine performance and safety. Therefore, an oil-gas separator is a crucial component for ensuring the reliable operation of the lubrication system.

[0003] Currently, there are three main types of oil-gas separators commonly used in aero engines: flat plate type, centrifugal type, and hydrodynamic type. Flat plate type oil-gas separators have a simple structure, relying on the bursting of air bubbles as lubricating oil flows through a flat plate or filter to achieve separation. However, they are ineffective at separating high-viscosity lubricating oil and small-diameter air bubbles, and are prone to clogging. Centrifugal type oil-gas separators utilize the centrifugal force field generated by the high-speed rotation of the rotor to throw denser oil droplets towards the wall, while the gas concentrates at the center and is discharged. They are highly efficient at high speeds, but at low engine speeds (such as idle), the centrifugal force weakens due to the decreased rotor speed, resulting in a sharp drop in separation efficiency. Furthermore, they have limited ability to separate micron-sized oil mist. Hydrodynamic type oil-gas separators rely on the vortex and pressure gradient generated by the high-speed flow of the oil-gas mixture within a specific flow channel (such as a spiral channel), causing oil droplets to be thrown towards the wall under the action of inertial force and pressure difference. They are highly efficient at separating fine oil droplets, but the flow channel structure is complex, pressure drop losses are large, and the separation efficiency is sensitive to changes in flow rate.

[0004] In summary, existing oil-gas separators based on a single separation principle generally suffer from problems such as poor reliability, low efficiency at low speeds, large pressure drop losses, and narrow operating range. Therefore, there is an urgent need for a new type of oil-gas separator structure that can achieve high-efficiency, low-pressure-drop, and high-reliability oil-gas separation across the entire operating range of aero-engines, especially under low-speed conditions. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a centrifuge. Structure and method of aero-engine oil-gas separator with combined hydrodynamic and pressure characteristics. This invention organically integrates the principles of centrifugal separation and hydrodynamic screening to achieve complementary advantages. It aims to solve the technical problems of existing separators, such as low efficiency, large pressure drop, poor reliability, and weak adaptability to operating conditions at low speeds, thereby enabling efficient, stable, and reliable oil-gas separation in aero-engines across the entire operating range.

[0006] The technical solution of this invention is implemented as follows: Firstly, the present invention provides a centrifuge The structure of the aero-engine oil-gas separator with dynamic pressure combined synergy includes a separator mounting base, an external stationary cylinder, a fixed tangential vortex generator, a vent pipe assembly, a cone, an internal rotating cylinder, and a drive shaft.

[0007] The outer stationary cylinder is fixedly mounted on the separator mounting base. The inner rotating cylinder is coaxially disposed inside the outer stationary cylinder, forming an annular dynamic-static separation chamber between the two. The wall of the inner rotating cylinder is made of a dense microporous material or has uniformly distributed micropores. The pore size of the micropores is configured to allow liquid lubricating oil to pass through under centrifugal force, but to effectively block gas flow.

[0008] The fixed tangential vortex generator is fixedly installed at the inlet end of the inner rotating cylinder, and includes a spiral guide tube. The spiral guide tube is used to efficiently and without impact transform the oil-gas mixture from the inlet pipe into a strong tangential rotating flow that is consistent with the rotation direction of the inner rotating cylinder, and smoothly guide it into the inner wall of the inner rotating cylinder.

[0009] The drive shaft is connected to the inner rotating cylinder and is used to drive the inner rotating cylinder to rotate at high speed. The venting pipe assembly includes a gas inlet pipe and a gas outlet pipe. The gas inlet pipe is located in the axial region of the inner rotating cylinder and communicates with the inner cavity of the inner rotating cylinder, and is used to discharge the separated gas.

[0010] As a further technical solution of the present invention: the fixed tangential vortex generator is a stationary short cylindrical structure, with a very small gap between it and the outer wall of the inner rotating cylinder to avoid friction and prevent unseparated oil-gas mixture from directly entering the dynamic-static separation chamber. The helix angle of the spiral guide tube is between 15° and 35°, preferably 20°.

[0011] As a further technical solution of the present invention: the microporous region of the inner rotating cylinder at least covers its cylindrical cylinder wall, and the micropore diameter ranges from 10 micrometers to 10,000 micrometers.

[0012] As a further technical solution of the present invention: the power input end of the drive shaft is connected to a high-speed variable frequency motor, which is controlled by an external controller. The controller is configured to receive the engine's operating condition signal and drive the internal rotating cylinder to maintain a constant or optimal speed according to a preset rule to adapt to different operating conditions.

[0013] As a further technical solution of the present invention: the inner wall of the outer stationary cylinder is a smooth surface, which is conducive to capturing the lubricating oil ejected from the micro-hole of the inner rotating cylinder and allowing it to flow downward along the wall to the cone under the action of gravity.

[0014] As a further technical solution of the present invention: the side and bottom of the cone are provided with uniformly distributed micropores for further oil-gas separation of the flowing lubricating oil, and the separated oil finally enters the oil collection tank or lubricating oil box.

[0015] As a further technical solution of the present invention: the drive shaft is supported on the vent pipe assembly and the cone by an upper bearing, a sealing assembly, and a lower bearing. The upper bearing and the sealing assembly are equipped with a cup seal to prevent leakage of the oil-gas mixture.

[0016] As a further technical solution of the present invention: the inner wall of the inner rotating cylinder may be provided with spiral or straight guide vanes, which are used to "catch" the oil-gas mixture when it enters and drive it to rotate at high speed with the inner rotating cylinder, thereby generating a stronger centrifugal force.

[0017] Secondly, the present invention provides a centrifugal... A hydrodynamic and pressure-based combined oil-gas separation method for aero-engines includes the following steps: S1: The oil-gas mixture passes through the spiral guide tube of the fixed tangential vortex generator, and changes from lateral flow to tangential vortex flow in the same direction as the rotation of the internal rotating cylinder, and is smoothly introduced into the inner cavity of the high-speed rotating internal rotating cylinder. S2: Inside the internal rotating cylinder, the oil-gas mixture is subjected to strong centrifugal force. The denser oil droplets are thrown toward the cylinder wall and, under centrifugal pressure, penetrate the micropores of the cylinder wall and enter the dynamic-static separation chamber in the form of a jet. The less dense gas is confined to the central region inside the cylinder. S3: The lubricating oil jet that penetrates the micropores impacts the smooth inner wall of the outer stationary cylinder, achieving secondary separation and coalescence of oil and gas, forming an oil film, and flowing downward along the wall to the cone under the action of gravity; S4: The lubricating oil passes through the micropores on the wall of the cone to achieve the third oil-gas separation, and finally the clean oil enters the oil collection tank or lubricating oil box. S5: Gas with extremely low oil content that accumulates in the central region of the internal rotating cylinder is discharged through the gas inlet pipe and gas outlet pipe under the pressure difference.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. High-efficiency separation under all operating conditions: Through the combined synergistic mechanism of centrifugal separation and dynamic pressure screening, it utilizes the strong centrifugal force at high speeds and ensures high separation efficiency even at low engine speeds through microporous dynamic pressure screening and tangential eddy current pretreatment, thus overcoming the problem of inefficiency in traditional centrifugal separators.

[0019] 2. Low pressure drop and low energy consumption: The helical guide tube design of the fixed tangential vortex generator achieves smooth guidance and pre-swirl of the oil-gas mixture, greatly reducing flow losses and inlet impact pressure drop. At the same time, by controlling the internal rotating cylinder speed to the optimal value, unnecessary energy consumption is avoided.

[0020] 3. High reliability and long maintenance cycle: The microporous structure is not easily clogged by the continuous flushing of oil droplets, and the gaps between moving and stationary parts eliminate frictional wear. The overall structure is robust and uses high-performance materials (such as porous titanium alloy), extending service life and maintenance intervals.

[0021] 4. Compact structure and strong adaptability: The coaxial design of the moving and stationary cylinders makes the structure very compact, facilitating installation within the limited space of an aero-engine. Driven by a variable frequency motor or gearbox, the speed is adjustable, allowing for flexible adaptation to the needs of different engine operating conditions.

[0022] 5. Multi-stage deep separation: Achieves "initial centrifugal separation" Microporous dynamic pressure screening stationary wall impact The multi-stage separation process of "cone micropore filtration" has high efficiency in capturing oil droplets (especially fine oil mist) and extremely low oil content in the outlet gas.

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0024] Figure 1 Centrifugation in an embodiment of the present invention Axial schematic diagram of the structure of the dynamic pressure combined synergistic oil-gas separator.

[0025] Figure 2 Centrifugation in an embodiment of the present invention Axial cross-sectional view of the structure of the dynamic pressure combined synergistic oil-gas separator.

[0026] Explanation of reference numerals in the figure: 1—Separator mounting base, 2—Mounting base flange, 3—Sealing ring groove, 4—Outer stationary cylinder, 5—Cone, 6—Inner rotating cylinder, 7—Drive shaft, 8—Drive shaft power input end, 9—Fixed tangential vortex generator, 10—Helical guide pipe, 11—Oil-gas mixture inlet pipe, 12—Ventilation pipe assembly, 13—Gas inlet pipe, 14—Gas outlet pipe, 15—Upper bearing and sealing assembly, 16—Lower bearing. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of the embodiments of this invention will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some embodiments of this invention, but not all embodiments.

[0028] The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the invention, and should not be construed as limiting the invention.

[0029] Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this invention.

[0030] The following is in conjunction with the appendix Figure 1-2 The embodiments of the present invention will be described in detail below.

[0031] Example 1 like Figure 1 and Figure 2 As shown, the present invention provides a centrifuge The core of the dynamic-pressure combined synergistic aero-engine oil-gas separator structure lies in the "dynamic-static dual-cylinder" synergistic separation structure composed of an outer stationary cylinder 4 and an inner rotating cylinder 6.

[0032] The separator mounting base 1 is used to install the entire separator onto components such as the lubricating oil tank. It is equipped with a mounting base flange 2 and a sealing ring groove 3, and a reliable connection and seal are achieved through fasteners and sealing rings.

[0033] The outer stationary cylinder 4 is fixedly mounted on the separator mounting base 1 and is made of high-strength aluminum alloy casting, with its inner wall machined to a smooth surface. The inner rotating cylinder 6 is driven by a drive shaft 7 and coaxially arranged inside the outer stationary cylinder 4, forming an annular dynamic-static separation chamber between the two. The inner rotating cylinder 6 is made of porous titanium alloy or sintered stainless steel using powder metallurgy technology, ensuring that the micropores on its cylinder wall are uniform and have sufficient structural strength. The microporous region covers its cylindrical cylinder wall, with a pore diameter ranging from 10 mm. The specific size of 10,000 micrometers needs to be optimized based on the characteristics of the lubricating oil and the operating conditions to balance the flow capacity and air resistance.

[0034] The fixed tangential vortex generator 9 is fixed to the separator mounting base 1 by welding or fastening, located at the inlet end of the inner rotating cylinder 6. It is a stationary short cylindrical component with an integrated spiral guide tube 10 inside. The oil-gas mixture enters from the inlet pipe 11, is guided by the spiral guide tube 10, and smoothly transforms from transverse flow to strong tangential vortex. The helix angle of the spiral guide tube 10 is a key design parameter, typically around 15°. The angle is between 35°, preferably 20°, to achieve the best balance between swirling intensity and pressure drop. A very small gap is maintained between the fixed tangential vortex generator 9 and the outer wall of the inner rotating cylinder 6 to avoid rotational friction and prevent oil and gas from short-circuiting into the dynamic-static separation chamber.

[0035] The upper end of the drive shaft 7 receives power through the drive shaft power input end 8. In a preferred embodiment, the drive shaft power input end 8 is directly connected to the output shaft of a high-speed variable frequency motor integrated on the separator end cover. This motor is controlled by an external controller, which receives real-time operating condition signals such as engine speed and power, and outputs control commands to drive the internal rotating drum 6 to maintain a preset optimal speed (e.g., 5000 rpm). (Adjustable within a 25,000 rpm range) to maintain optimal separation performance under all operating conditions. Alternatively, the driveshaft power input end 8 can also be connected to the engine accessory housing via a gearbox and mechanically driven by the engine.

[0036] The drive shaft 7 is supported on the vent pipe assembly 12 and the cone 5 by an upper bearing and sealing assembly 15 and a lower bearing 16. The upper bearing and sealing assembly 15 use a cup seal to effectively prevent the oil-gas mixture from leaking along the shaft.

[0037] The vent pipe assembly 12 is fixed to the upper part of the separator. After multi-stage separation, the clean gas accumulates in the low-pressure zone at the center of the inner rotating cylinder 6, and then is discharged through the gas inlet pipe 13 located in this zone and the gas outlet pipe 14.

[0038] The cone 5 is welded to the bottom of the outer stationary cylinder 4. Uniform micropores are also formed on its sides and bottom. The oil film flowing down from the inner wall of the outer stationary cylinder 4 collects in the cone 5 and passes through the micropores again, achieving final fine separation. The clean lubricating oil then flows into the oil collection tank below or returns to the lubricating oil box.

[0039] Work process: During operation, the oil-gas mixture enters the fixed tangential vortex generator 9 through the inlet pipe 11, forming a high-speed tangential vortex in the same direction as the internal rotating cylinder 6 via the spiral guide pipe 10, and is smoothly injected into the inner cavity of the high-speed rotating inner cylinder 6. The mixture is immediately subjected to a strong centrifugal force. Oil droplets are thrown against the cylinder wall and, under enormous centrifugal pressure, are forced to penetrate the micropores of the cylinder wall, entering the dynamic-static separation chamber as an extremely fine jet. The jet impacts the smooth inner wall of the outer stationary cylinder 4, causing the oil droplets to coalesce into a film, which then flows downward into the cone 5 under gravity. The gas, due to its low density and insufficient power, cannot penetrate the micropores, is confined to the center of the rotating cylinder, and gradually accumulates towards the axis, eventually being discharged through the vent pipe assembly 12. The oil flowing into the cone 5 undergoes a final separation as it passes through its micropores, yielding high-purity lubricating oil.

[0040] Through the ingenious design of "combining static and dynamic forces, and coordinating centrifugal and dynamic pressure", this invention efficiently converts the kinetic energy of the oil-gas mixture into rotational kinetic energy and separation work, achieving excellent performance with compact structure, high efficiency, wide adaptability to operating conditions, and long maintenance cycle. It is especially suitable for aero-engine lubricating oil systems with extremely high requirements for reliability and efficiency.

[0041] Example 2 like Figure 1 and Figure 2 As shown, the present invention provides a centrifugal-hydrodynamic composite synergistic structure for an aero-engine oil-gas separator, comprising: a separator mounting base 1, a mounting base flange 2, a sealing ring groove 3, an outer stationary cylinder 4, a cone 5, an inner rotating cylinder 6, a drive shaft 7, a drive shaft power input end 8, a fixed tangential vortex generator 9, a spiral guide pipe 10, an inlet pipe 11, a vent pipe assembly 12, a gas inlet pipe 13, a gas outlet pipe 14, an upper bearing and sealing assembly 15, and a lower bearing 16.

[0042] A centrifugal-dynamic pressure combined synergistic aero-engine oil-gas separator, the core of which is a dynamic-static dual-cylinder structure consisting of an outer stationary cylinder 4 and an inner rotating cylinder 6.

[0043] The internal rotating drum 6 is a key component for performing primary centrifugal separation. It is driven to rotate at high speed by the drive shaft 7, and its drum wall is made of a material with micropores or has micropores. When the oil-gas mixture enters the interior of the rotating drum through the inlet pipe 11 of the venting pipe assembly 12, under the action of centrifugal force, the denser oil droplets are thrown towards the inner wall of the internal rotating drum 6.

[0044] "Microporous dynamic pressure screening" is the synergistic mechanism by which this invention achieves deep separation. The lubricating oil, thrown into the inner rotating drum 6, is forced to penetrate the dense microporous material or micropores of the drum wall under immense centrifugal pressure, entering the dynamic-static separation chamber as an extremely fine jet. Meanwhile, the gas, due to its low density, cannot generate sufficient force to penetrate the micropores and is mostly confined inside the rotating drum. This process achieves "dynamic filtration" of the liquid lubricating oil and further separation of oil and gas.

[0045] The inner wall of the outer stationary cylinder 4 serves as the final collection surface. Lubricating oil ejected from the micropores in the wall of the inner rotating cylinder 6 impacts the stationary shell wall, achieving secondary oil-gas separation under the intense impact. Here, oil coalesces to form an oil film. Since the outer shell is stationary and lacks centrifugal force, the oil film naturally flows downwards along the wall under gravity, reaching the cone connected to its bottom. The lubricating oil undergoes a third oil-gas separation through the micropores on the cone wall and bottom, ultimately entering the oil collection tank or lubricating oil container.

[0046] The vent assembly 12 is used to discharge the separated gas. After the two-stage separation of centrifugation and dynamic pressure screening, the gas remaining inside the inner rotating cylinder 6 has a very low oil content. Driven by the pressure difference, this gas flows to the low-pressure zone located in the axial region of the inner rotating cylinder 6 and accumulates, and is discharged through the top gas inlet pipe 13 and the gas outlet pipe 14.

[0047] The fixed tangential vortex generator 9, as a stationary component, is installed at the inlet end of the internal rotating cylinder 6, and the whole is a short cylindrical structure. The fixed tangential vortex generator 9 is fixedly or welded to the separator mounting base 1 and the vent pipe assembly 12.

[0048] The outer stationary cylinder 4 and the inner rotating cylinder 6 are coaxially arranged and driven by a transmission shaft 7 fixedly connected to the inner rotating cylinder 6. The coaxially arranged inner rotating cylinder 6 and outer stationary cylinder 4 form an annular dynamic-static separation cavity.

[0049] The gas outlet pipe 14 of the vent pipe assembly 12 is connected to the inner cavity of the inner rotating cylinder 6 through a gas inlet pipe 13 located in the axial region of the inner rotating cylinder 6.

[0050] During operation, the fixed tangential vortex generator 9 does not rotate. The oil-gas mixture enters through the inlet pipe 11 and passes through the spiral guide pipe 10 on the fixed tangential vortex generator 9, which transforms the oil-gas mixture from a transverse flow without impact and efficiently into a strong tangential rotational flow that is consistent with the rotation direction of the internal rotating drum 6, so that it is smoothly introduced into the inner wall of the rotating drum, thereby creating the initial conditions for subsequent centrifugal separation.

[0051] After the oil-gas mixture enters the inner rotating cylinder 6 tangentially, it continues to rotate and flow at high speed along the inner wall of the inner rotating cylinder 6 due to inertia and the driving force of the inner wall. Simultaneously, under the action of strong centrifugal force, denser oil droplets enter the dynamic-static separation chamber between the outer stationary cylinder 4 and the inner rotating cylinder 6 through micropores in the inner wall of the inner rotating cylinder 6, where they are captured by the inner wall of the outer stationary cylinder 4. The captured lubricating oil flows downwards along the inner wall of the outer stationary cylinder 4 to the cone 5 under the action of gravity. The cone 5 has uniformly distributed micropores on its sides and bottom; when oil droplets penetrate these micropores, the oil and gas are separated again. The filtered oil finally enters the oil collection tank or lubricating oil box.

[0052] When the denser oil is driven by the inner rotating cylinder 6 to rotate and flow along its inner wall or enter the dynamic-static separation chamber through the micropores on the wall, the less dense gas accumulates in the central region of the inner rotating cylinder 6. The gas accumulated in the central region of the inner rotating cylinder 6 is discharged through the gas inlet pipe 13 and the gas outlet pipe 14 of the vent pipe assembly 12.

[0053] The fixed tangential eddy current generator 9 can be manufactured independently and then installed into the separator mounting base 1, or it can be integrated with the separator mounting base 1.

[0054] There is a very small gap between the fixed tangential vortex generator 9 and the outer wall of the inner rotating cylinder 6 to avoid friction. In addition, the very small gap between the fixed tangential vortex generator 9 and the outer wall of the inner rotating cylinder 6 also prevents the large-scale direct flow of unseparated oil-gas mixture into the dynamic-static separation chamber.

[0055] When the oil-gas mixture flows out of the outlet of the fixed tangential vortex generator 9, it is already a vortex with extremely high tangential velocity, and is smoothly "injected" into the inner cavity of the inner rotating cylinder 6 which is rotating at high speed in the same direction, and is immediately subjected to a strong centrifugal force.

[0056] The spiral guide tube 10 on the fixed tangential vortex generator 9 adopts a spiral tubular structure to guide the oil-gas mixture smoothly from lateral flow to high-speed rotational flow along the internal rotating cylinder 6, reducing flow loss and pressure drop.

[0057] Key design parameters of the helical guide pipe 10 include: the helix angle, the included angle between the guide pipe and the axial direction, and the shape and size of the pipe cross-section. The helix angle controls the ratio of the rotational intensity and tangential velocity of the oil-gas mixture and is the core of the design; the pipe cross-sectional shape can improve the flow performance of the oil-gas mixture and reduce energy loss; the pipe cross-sectional size affects the flow area and hydrodynamic performance of the channel. The helix angle is between 15° and 35°, preferably 20°, but a variable helix angle can also be used.

[0058] The inner rotating cylinder 6 has a wall made of dense microporous material or has uniformly distributed micropores. The pore size of the micropores is configured to allow liquid lubricating oil to pass through under centrifugal force, but to effectively block gas flow.

[0059] The microporous region of the inner rotating cylinder 6 at least covers its cylindrical wall and bottom, and the pore size ranges from 10 to 10,000 micrometers. The selection of the micropore size should ensure sufficient flow area to reduce the resistance to lubricating oil discharge while effectively preventing gas penetration.

[0060] Oil droplets passing through the six micro-holes of the internal rotating cylinder have a continuous flushing effect on the micro-holes, thereby reducing the risk of micro-hole blockage and extending the maintenance cycle.

[0061] In addition to micropores, the inner wall of the internal rotating cylinder 6 can also have spiral or straight guide vanes. When the oil-gas mixture enters, it is "caught" and driven to rotate at high speed along with the internal rotating cylinder 6, generating a stronger centrifugal force.

[0062] The internal rotating cylinder 6 is fixed to the drive shaft 7 through its bottom end face, and is thus driven to rotate by the drive shaft power input end 8 at one end of the drive shaft 7.

[0063] The power input end 8 of the drive shaft is connected to the output shaft of a high-speed variable frequency motor integrated into the end cover of the oil-gas separator. The high-speed motor is controlled by an external controller configured to receive engine operating condition signals and drive the internal rotating cylinder 6 to maintain a constant or optimal speed according to a preset pattern.

[0064] The driveshaft power input end 8 can also be driven by a gearbox. The driveshaft power input end 8 is connected to the power take-off end of the engine accessory housing via a gear speed increaser. The gear speed increaser increases the input speed of the accessory housing to the operating speed required by the internal rotating cylinder 6.

[0065] To achieve optimal performance of the oil-gas separator under all operating conditions, a high-speed variable frequency motor drive is adopted as the main implementation method. The speed range of the power input end 8 of the drive shaft is proportional to that of the main rotor of the engine, typically operating between 5000 and 25000 rpm.

[0066] The drive shaft 7 is supported on the vent pipe assembly 12 and the cone 5 by the upper bearing and sealing assembly 15 and the lower bearing 16. The upper bearing and sealing assembly 15 is sealed with a cup seal to prevent leakage of the oil-gas mixture.

[0067] The outer stationary cylinder 4 and the separator mounting base 1 are made of high-strength aluminum alloy casting; the inner rotating cylinder 6 is made of porous titanium alloy or sintered stainless steel made by powder metallurgy technology, which ensures the uniformity of micropores and structural strength.

[0068] The outer stationary cylinder 4 and the inner rotating cylinder 6 can be designed with different diameter and length ratios to optimize performance matching under different working conditions. The diameter of the outer stationary cylinder 4 is slightly larger than that of the inner rotating cylinder 6.

[0069] The separator mounting base 1 is equipped with a mounting flange 2 and a sealing ring groove 3. The mounting flange 2 can be connected to the end face of the lubricating oil tank by fasteners; the sealing ring groove 3 is sealed to the pipe wall connected to the lubricating oil tank by a rubber ring.

[0070] The inner wall of the outer stationary cylinder 4 is a smooth surface to facilitate the capture of lubricating oil thrown out from the micro-holes of the inner rotating cylinder 6 and to allow it to flow downwards toward the cone 5 under the action of gravity.

[0071] The bottom of the outer stationary cylinder 4 is connected to the bottom end face of the cone 5 by welding.

[0072] The centrifugal-dynamic pressure combined synergistic aero-engine oil-gas separator structure designed according to the above method can cleverly utilize the principle of "dynamic-static separation" to achieve synergy between centrifugal separation and dynamic pressure screening. It has a compact structure, high separation efficiency, and can maintain good performance even under low engine speed conditions. In addition, it converts almost all the kinetic energy of the incoming flow into rotational kinetic energy, maximizing the centrifugal separation effect.

[0073] Example 3 This invention discloses a centrifugal-dynamic pressure combined synergistic aero-engine oil-gas separator structure, which includes: a separator mounting base 1, an outer stationary cylinder 4 disposed on the separator mounting base 1, a fixed tangential vortex generator 9 and a vent pipe assembly 12, and a cone 5. The invention is characterized by: further including an inner rotating cylinder 6 coaxially disposed inside the outer stationary cylinder 4, and a transmission shaft 7 for driving the inner rotating cylinder 6 to rotate. The inner rotating cylinder 6 has a wall made of dense microporous material or has uniformly distributed micropores. The pore size of the micropores is configured to allow liquid lubricating oil to pass through under centrifugal force, but to effectively block gas flow. The coaxially arranged inner rotating cylinder 6 and the outer stationary cylinder 4 form an annular dynamic-static separation chamber. The gas outlet pipe 14 of the vent pipe assembly 12 is connected to the inner cavity of the inner rotating cylinder 6 through a gas inlet pipe 13 located in the axial region of the inner rotating cylinder 6.

[0074] Furthermore, the internal rotating cylinder 6 is fixedly connected to the drive shaft 7 via its bottom end face, and is thus driven to rotate by the power input end 8 of the drive shaft.

[0075] Furthermore, the drive shaft 7 includes a drive shaft power input end 8, which is connected to the output shaft of a high-speed variable frequency motor integrated into the oil-gas separator end cover. The high-speed motor is controlled by an external controller configured to receive engine operating condition signals and drive the internal rotating cylinder 6 to maintain a constant or optimal speed according to a preset pattern.

[0076] Furthermore, the fixed tangential vortex generator 9, as a stationary component, is installed at the inlet end of the inner rotating cylinder 6, and is an overall short cylindrical structure. The fixed tangential vortex generator 9 does not rotate; instead, through its spiral guide pipe 10, it efficiently and without impact transforms the oil-gas mixture from the inlet pipe 11 from a transverse flow into a strong tangential rotating flow in the same direction as the rotation of the inner rotating cylinder 6, allowing it to be smoothly guided into the inner wall of the rotating drum, thus creating initial conditions for subsequent centrifugal separation. There is a very small gap between the fixed tangential vortex generator 9 and the outer wall of the inner rotating cylinder 6 to avoid friction.

[0077] Furthermore, when the oil-gas mixture flows out of the outlet of the fixed tangential vortex generator 9, it is already a swirling flow with extremely high tangential velocity, and is smoothly "injected" into the inner cavity of the inner rotating cylinder 6, which is rotating at high speed in the same direction. The lubricating oil thrown into the inner rotating cylinder 6 is forced to penetrate the dense microporous material or micropores of the cylinder wall under the action of huge centrifugal pressure, and enters the dynamic-static separation chamber in the form of an extremely fine jet.

[0078] Furthermore, the spiral guide tube 10 forms a flow channel from the transverse inlet to the tangential outlet of the inner wall of the inner rotating cylinder 6.

[0079] Furthermore, the spiral guide pipe 10 employs a spiral tubular structure to smoothly guide the oil-gas mixture from lateral motion to rotational motion, reducing flow losses and pressure drop. Key design parameters of the spiral guide pipe 10 include: the helix angle, the angle between the guide pipe and the axial direction, and the pipe cross-sectional area. The helix angle controls the ratio of the rotational intensity and tangential velocity of the oil-gas mixture; the pipe cross-sectional area affects the flow channel's surface area and hydrodynamic performance.

[0080] Furthermore, the microporous region of the inner rotating cylinder 6 at least covers its cylindrical wall, and the pore size ranges from 10 to 10,000 micrometers.

[0081] Furthermore, the inner wall of the outer stationary cylinder 4 is a smooth surface, which facilitates the capture of lubricating oil thrown out from the micropores of the inner rotating cylinder 6 and allows it to flow downwards towards the cone 5 under the action of gravity.

[0082] Furthermore, the oil droplets passing through the micropores of the internal rotating cylinder 6 have a continuous scouring effect on the micropores, thereby reducing the risk of micropore blockage and extending the maintenance cycle.

[0083] Furthermore, the bottom of the outer stationary cylinder 4 is welded to the bottom end face of the cone 5. The cone 5 has uniformly distributed micropores on its sides and bottom; when oil droplets penetrate these micropores, the oil and gas are separated again. The filtered oil then enters an oil collection tank or a lubricating oil tank.

[0084] Furthermore, the drive shaft 7 is supported on the vent pipe assembly 12 and the cone 5 by an upper bearing and sealing assembly 15 and a lower bearing 16. The upper bearing and sealing assembly 15 is a cup seal to prevent leakage of the oil-gas mixture.

[0085] Furthermore, the separator mounting base 1 is provided with a mounting base flange 2 and a sealing ring groove 3. The mounting base flange 2 can be connected to the end face of the lubricating oil tank by fasteners; the sealing ring groove 3 is sealed to the pipe wall connected to the lubricating oil tank by a rubber ring.

[0086] The purpose of this invention is to overcome the shortcomings of the prior art and provide a centrifugal-hydrodynamic composite synergistic oil-gas separator structure for aero-engines. By organically integrating centrifugal separation and hydrodynamic separation, complementary advantages are achieved, enabling aero-engines to perform oil-gas separation with high efficiency, low pressure drop, and high reliability under all operating conditions, especially at low speeds.

[0087] To address the above problems, this invention provides a novel, efficient, and stable centrifugal-hydrodynamic composite synergistic oil-gas separator structure for aero-engines. This structure enables efficient oil-gas separation within a limited space, at low cost, and with easy installation. It solves the problems of low efficiency, poor reliability, and limited operating range found in existing engine oil-gas separators, achieving high-efficiency, low-pressure-drop, and high-reliability oil-gas separation, reducing the gas content in lubricating oil, decreasing lubricating oil consumption, and lowering costs.

[0088] Thus, the objective of this invention has been achieved.

[0089] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A centrifugal-dynamic pressure combined synergistic aeroengine oil-gas separator structure, characterized in that, include: Separator mounting base (1), external stationary cylinder (4), fixed tangential vortex generator (9), vent pipe assembly (12), cone (5), internal rotating cylinder (6) and drive shaft (7); The outer stationary cylinder (4) is set on the separator mounting base (1), and the inner rotating cylinder (6) is coaxially set inside the outer stationary cylinder (4), forming an annular dynamic-static separation chamber between the two. The inner rotating cylinder (6) has a wall made of dense microporous material or has uniformly distributed micropores. The pore size of the micropores is configured to allow liquid lubricating oil to penetrate under centrifugal force and to block gas flow. The fixed tangential vortex generator (9) is fixedly installed at the inlet end of the inner rotating cylinder (6), and includes a spiral guide tube (10) for converting the oil-gas mixture from transverse flow to tangential vortex flow in the same direction as the rotation of the inner rotating cylinder (6); The drive shaft (7) is connected to the inner rotating cylinder (6) and is used to drive its rotation; The ventilation pipe assembly (12) includes a gas inlet pipe (13) and a gas outlet pipe (14). The gas inlet pipe (13) is located in the axial region of the inner rotating cylinder (6) and communicates with the inner cavity of the inner rotating cylinder (6).

2. The oil-gas separator structure according to claim 1, characterized in that: The fixed tangential eddy current generator (9) is a stationary short cylindrical structure with a very small gap between it and the outer wall of the inner rotating cylinder (6) to avoid friction. The spiral angle of the spiral guide tube (10) is between 15° and 35°.

3. The oil-gas separator structure according to claim 1, characterized in that: The microporous region of the inner rotating cylinder (6) at least covers its cylindrical wall, and the micropore diameter ranges from 10 micrometers to 10,000 micrometers.

4. The oil-gas separator structure according to claim 1, characterized in that: The drive shaft power input end (8) of the drive shaft (7) is connected to a high-speed variable frequency motor. The high-speed variable frequency motor is controlled by an external controller, which is configured to receive engine operating condition signals and adjust the rotation speed of the internal rotating cylinder (6).

5. The oil-gas separator structure according to claim 1, characterized in that: The inner wall of the outer stationary cylinder (4) is a smooth surface, which is used to capture the lubricating oil ejected from the micro-hole of the inner rotating cylinder (6) and guide it to flow to the cone (5) under the action of gravity.

6. The oil-gas separator structure according to claim 1, characterized in that: The cone (5) has uniformly distributed micropores on its sides and bottom for further oil-gas separation of the incoming lubricating oil.

7. The oil-gas separator structure according to claim 1, characterized in that: The drive shaft (7) is supported on the vent assembly (12) and the cone (5) by an upper bearing and sealing assembly (15) and a lower bearing (16), wherein the upper bearing and sealing assembly (15) is a cup seal.

8. The oil-gas separator structure according to claim 1, characterized in that: The inner wall of the internal rotating cylinder (6) is also provided with spiral or straight guide vanes to enhance the rotational flow of the oil-gas mixture.

9. An aero-engine oil-gas separation method based on centrifugal-dynamic pressure composite synergy, characterized in that, Includes the following steps: S1: The oil-gas mixture changes from transverse flow to tangential vortex flow through the spiral guide tube (10) of the fixed tangential vortex generator (9) and is smoothly introduced into the inner cavity of the high-speed rotating inner cylinder (6); S2: Inside the internal rotating cylinder (6), the oil-gas mixture is subjected to centrifugal force, and the oil droplets are thrown towards the cylinder wall and penetrate the micropores to enter the dynamic-static separation chamber, while the gas is confined in the central region of the cylinder. S3: The lubricating oil that penetrates the micropores impacts the inner wall of the outer stationary cylinder (4) in the form of a jet, achieving secondary separation, and flows down the wall to the cone (5) under the action of gravity. S4: The lubricating oil passes through the micropores in the cone (5) and enters the oil collection tank or lubricating oil box after three separations; S5: The separated gas is discharged through the gas inlet pipe (13) and gas outlet pipe (14) located in the central region of the inner rotating cylinder (6).

10. The oil-gas separation method according to claim 9, characterized in that: In step S1, the rotation speed of the internal rotating cylinder (6) is adjusted to maintain a constant or optimal rotation speed under all working conditions, so as to achieve the synergistic effect of centrifugal separation and dynamic pressure screening.

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