CN114856819A

CN114856819A - Oil-gas separation device and aircraft engine

Info

Publication number: CN114856819A
Application number: CN202110149335.XA
Authority: CN
Inventors: 吴超琦; 沈洁阳; 李铠月
Original assignee: AECC Commercial Aircraft Engine Co Ltd
Current assignee: AECC Commercial Aircraft Engine Co Ltd
Priority date: 2021-02-03
Filing date: 2021-02-03
Publication date: 2022-08-05
Anticipated expiration: 2041-02-03
Also published as: CN114856819B

Abstract

The invention relates to an oil-gas separation device and an aircraft engine, wherein the oil-gas separation device comprises a gear shaft (1), a first gear (2), a second gear (3) and a plurality of partition plates (4), the first gear (2) and the second gear (3) are sequentially mounted on the gear shaft (1) along the axial direction of the gear shaft (1), a gap is formed between the first gear (2) and the second gear (3), and the partition plates (4) are arranged in the gap at intervals along the circumferential direction of the gear shaft (1). The aircraft engine comprises an oil-gas separation device.

Description

Oil-gas separation device and aircraft engine

Technical Field

The invention relates to the technical field of oil-gas separation, in particular to an oil-gas separation device and an aircraft engine.

Background

The power of the aircraft engine transmission mainly comes from the work of gas on the turbine, the hot air from the combustion chamber enables the main shaft to rotate and drives other accessories to be driven, and the mechanical transmission needs a lubricating oil system to provide lubrication and cooling for all transmission accessories, so that the reliability of all the accessories in the operation process is guaranteed. The lubricating oil cavity and the gas cavity of the aero-engine are separated through the sealing device, along with the increasing of the engine pressure increasing ratio, the temperature in front of the turbine and the running speed of the main shaft rotor, the increasing heat load of the main bearing cavity and the leakage gas in the sealing device can promote the pressure in the bearing cavity to be increased due to the fact that the evaporated lubricating oil and the splashed lubricating oil take away part of air and the like, and the normal work of a lubricating oil system can be influenced.

In order to ensure that the sealing pressure difference inside and outside the bearing cavity is stable (the pressure in the bearing cavity is lower than the pressure outside the bearing cavity), the oil sealing device can normally operate, and the lubricating oil mixed gas inside the bearing cavity is prevented from leaking. All bearing cavities inside the engine should be open to the atmosphere. Meanwhile, a ventilation system is arranged in the lubricating oil system to separate oil from gas and reduce the loss of lubricating oil, and the system is generally communicated with the atmosphere through a ventilator. The ventilator works on the principle that the lubricating oil mixed in the air is separated by centrifugal inertial collision, contact retention, diffusion and coagulation and the density difference between the lubricating oil and the air, so that the consumption of the lubricating oil is reduced.

At present, the typical ventilators used in the ventilation systems of aircraft engines are mainly of two types, namely a centrifuge type ventilator and an impeller type ventilator. The impeller ventilator is mainly composed of a gear shaft, a shell and a supporting bearing, and is provided with a set of complete accessory components, and a transmission mechanism in the accessory gearbox drives the impeller ventilator to transmit, so that oil and gas separation is carried out on oil-gas mixture entering the ventilator. The gear shaft is a central component for separating oil and gas, and is provided with a plurality of partition plates, the center of the gear shaft is a central shaft for supporting the gear shaft, a vent hole is formed in the shaft, and separated gas is discharged from the central hole, so that the ventilation of an inner cavity and the outside atmosphere is realized.

The impeller type ventilator installed in the accessory case comprises a plurality of components, when the running speed of an engine is increased, the rotating speed of a gear shaft in the center of the ventilator is increased, the tangential speed of other rotating components driving the ventilator is increased, after the impeller type ventilator runs for a long time, different rotating assembly parts in the ventilator assembly can vibrate, the wearing and loosening conditions can occur, the normal running of the ventilator can be influenced, and the running reliability of the aero-engine is difficult to ensure.

It is noted that the information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.

Disclosure of Invention

The embodiment of the invention provides an oil-gas separation device and an aircraft engine, and the structure of a centrifugal ventilator is improved.

According to one aspect of the present invention, there is provided an oil and gas separation device comprising:

a gear shaft;

the first gear and the second gear are sequentially arranged on the gear shaft along the axial direction of the gear shaft, and a gap is formed between the first gear and the second gear; and

and the plurality of partition plates are arranged in the gap at intervals along the circumferential direction of the gear shaft.

In some embodiments, the first gear includes a first end surface, the second gear includes a second end surface opposite the first end surface, and the spacer is connected to the gear shaft, the first end surface, and the second end surface.

In some embodiments, the first gear, the second gear, and the plurality of baffles are fixedly connected or integrally formed.

In some embodiments, the gear shaft, the first gear, the second gear, and the plurality of partitions are fixedly connected or integrally formed.

In some embodiments, the gear shaft includes a hollow vented shaft section provided with a vent hole communicating with the gap.

In some embodiments, the vent shaft segment is provided with a plurality of vent holes, and at least one vent hole is provided between two adjacent partition plates.

In some embodiments, the first gear has a thickness of 0.8 to 1.2mm in the axial direction; and/or the thickness of the second gear along the axial direction is 0.8-1.2 mm.

In some embodiments, one end of the gear shaft is provided with an air outlet, and the other end is closed.

In some embodiments, the plurality of partitions are uniformly arranged along a circumferential direction of the gear shaft.

According to another aspect of the invention, an aircraft engine is provided, comprising the oil-gas separation device.

Based on the technical scheme, the first gear, the second gear and the partition plates are arranged in the gap between the first gear and the second gear at intervals along the circumferential direction, so that the centrifugal ventilator is formed by the first gear, the second gear and the partition plates.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:

fig. 1 is a half sectional view of an oil-gas separation device in the related art.

Fig. 2 is a schematic view showing a structure of a centrifugal ventilator in the related art.

Fig. 3 is a schematic structural view of a gear shaft, a first gear and a second gear in the related art.

Fig. 4 is a schematic structural view of a gear shaft, a first gear, a second gear and a centrifugal ventilator in the related art.

Fig. 5 is a half sectional view of fig. 4.

FIG. 6 is a half sectional view of one embodiment of the oil and gas separation device of the present invention.

FIG. 7 is a schematic structural diagram of an embodiment of the oil-gas separation device of the present invention.

FIG. 8 is a schematic view showing the installation of a partition in one embodiment of the oil-gas separation device of the present invention.

FIG. 9 is a half sectional view showing a part of the structure of an embodiment of the oil-gas separation device of the present invention.

In the figure:

1a, a gear shaft; 2a, a first gear; 3a, a second gear; 4a, a centrifugal ventilator; 5a, a first bearing; 6a, a second bearing; 7a, a first cover plate; 8a, a second cover plate; 9a, a fastener;

11a, a vent hole; 12a, a first assembly surface; 13a, a second assembly surface; 14a, a third assembly surface; 15a and an air outlet;

41a and an air inlet; 42a, a partition plate; 43a, end plates; 44a, a bore wall;

1. a gear shaft; 2. a first gear; 3. a second gear; 4. a partition plate; 5. a first bearing; 6. a second bearing; 7. a first cover plate; 8. a second cover plate;

11. a vent hole; 12. a first assembly face; 13. a second assembly face; 14. a third assembly surface; 15. an air outlet; 16. a tapered structure; 21. a first end face; 31. a second end face; 41. and an air inlet.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "central," "lateral," "longitudinal," "front," "rear," "left," "right," "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the invention and for simplicity in description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the scope of the invention.

First, referring to fig. 1 to 5, the structure of an oil and gas separation device in the related art will be described.

As shown in fig. 1, the oil-gas separation device includes a gear shaft 1a, a first gear 2a, a second gear 3a, a centrifugal fan 4a, a first bearing 5a, a second bearing 6a, a first cover plate 7a, a second cover plate 8a, and a fastening member 9 a.

The first gear 2a and the second gear 3a are sequentially mounted on the outer circumferential surface of the gear shaft 1a in the axial direction of the gear shaft 1a, and the centrifugal ventilator 4a is mounted on the gear shaft 1a on the side of the first gear 2a remote from the second gear 3 a.

The side of the centrifugal fan 4a remote from the first gear wheel 2a is fixed by means of a fastening element 9 a. One end of the gear shaft 1a close to the first gear 2a is provided with a first cover plate 7a, and a first bearing 5a is arranged between the first cover plate 7a and the gear shaft 1 a. One end of the gear shaft 1a close to the second gear 3a is provided with a second cover plate 9a, and a second bearing 6a is arranged between the second cover plate 9a and the gear shaft 1 a.

In the axial direction of the gear shaft 1a, the thickness of the first gear 2a is H1, and the thickness of the second gear 3a is H2.

As shown in fig. 2, the centrifugal fan 4a is a relatively independent component from the first gear 2a and the second gear 3 a. The centrifugal fan 4a comprises two oppositely arranged end plates 43a and a plurality of partitions 42a arranged between the two end plates 43a, wherein an air inlet 41a of the centrifugal fan 4a is formed between two adjacent partitions 42 a. The centre of the centrifugal fan 4a is provided with a through-hole comprising a hole wall 44 a.

As shown in fig. 3, the gear shaft 1a is provided with a first mounting surface 12a on a side of the first gear 2a away from the second gear 3a, the first mounting surface 12a is provided with a plurality of ventilation holes 11a along a circumferential direction, and after the centrifugal fans 4a are mounted at the positions, the air inlets 41a correspond to the ventilation holes 11a one-to-one. The fastening member 9a is screw-mounted on the outer circumferential surface of the gear shaft 1 a. The gear shaft 1a is provided with a second mounting surface 13a on the side of the fastening member 9a remote from the first gear 2a, and the second gear 3a is provided with a third mounting surface 14a on the side remote from the first gear 2 a.

As shown in fig. 4, the centrifugal fan 4a is provided with a plurality of air inlets 41a in the circumferential direction.

As shown in fig. 5, the gear shaft 1a is a hollow structure, an air outlet 15a is formed at one end of the gear shaft 1a close to the centrifugal ventilator 4a, the oil-gas mixture enters the inside of the centrifugal ventilator 4a through the air inlet 41a for oil-gas separation, and the separated gas is discharged through the air outlet 15 a.

In the related art, the centrifugal ventilator 4a and the gear shaft 1a are relatively independent and assembled together, a clearance fit is adopted between the centrifugal ventilator and the gear shaft, the lower end face of the centrifugal ventilator 4a and the first gear 2a are matched in a surface contact mode, the upper end face of the centrifugal ventilator 4a is fixed on the gear shaft 1a through a fastening component 9a, the gear shaft 1a and the first bearing 5a and the second bearing 6a are assembled in a clearance fit mode to drive inner rings of the two bearings to rotate, the first gear 2a and the second gear 3a rotate to drive the centrifugal ventilator 4a to rotate together, the first cover plate 7a and the second cover plate 8a are kept in static assembly with the gear box, and a shafting component of the whole oil-gas separation device is fixed.

Because the first gear 2a, the second gear 3a and the centrifugal ventilator 4a are assembled with the gear shaft 1a in a combined manner, when the rotating speed of the gear shaft 1a is increased, the first gear 2a, the second gear 3a and the centrifugal ventilator 4a can vibrate, and the assembly relation between the first gear 2a, the second gear 3a and the centrifugal ventilator 4a and the gear shaft 1a can also loosen, so that the normal operation of the oil-gas separation device is influenced, even the failure of the oil-gas separation device is caused, and the oil-gas separation effect is influenced.

In order to solve at least one of the problems described above, the inventors have made an improvement in the structure of an oil and gas separation device.

As shown in fig. 6, in some embodiments of the oil-gas separation device provided in the present invention, the oil-gas separation device includes a gear shaft 1, a first gear 2, a second gear 3, and a plurality of partition plates 4, the first gear 2 and the second gear 3 are sequentially mounted on the gear shaft 1 in an axial direction of the gear shaft 1, and a gap is provided between the first gear 2 and the second gear 3, and the plurality of partition plates 4 are spaced apart from each other in a circumferential direction of the gear shaft 1.

In the above embodiment, by providing a plurality of partitions 4 at intervals in the circumferential direction in the gap between the first gear 2 and the second gear 3, so that the first gear 2, the second gear 3 and the partitions 4 form a centrifugal ventilator, compared to a scheme in which a separate centrifugal ventilator 4a is provided on the gear shaft 1a at a position away from the first gear 2a and the second gear 3a, the embodiment of the present invention improves the structure of the centrifugal ventilator, and the first gear 2 and the second gear 3 form a part of the centrifugal ventilator, thereby reducing the total number of parts of the centrifugal ventilator and simplifying the overall structure of the centrifugal ventilator.

Compared with the oil-gas separation device in the related art, the oil-gas separation device provided by the embodiment of the invention has at least the following advantages:

in a first aspect, in the present embodiment, the partition 4 is provided between the first gear 2 and the second gear 3, and the centrifugal ventilator is formed between the first gear 2 and the second gear 3. The spacer 4 has a direct or indirect supporting effect on the first gear 2 and the second gear 3 in the axial direction of the gear shaft 1. On this basis, can reduce the thickness of first gear 2 and second gear 3 on the axial direction, alleviate the weight of first gear 2 and second gear 3, further alleviate the whole weight of oil-gas separation device and the aeroengine that is equipped with oil-gas separation device, realize lightweight design, provide support for improving engine performance.

In some embodiments, the thickness H3 of the first gear 2 along the axial direction is 0.8-1.2 mm, such as 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, etc.; and/or the thickness H4 of the second gear 3 along the axial direction is 0.8-1.2 mm, such as 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm and the like.

However, in the related art described above, since the centrifugal fan 4a is disposed between the first gear 2a and the second gear 3a, and there is no support structure between the first gear 2a and the second gear 3a, the thickness H1 of the first gear 2a and the thickness H2 of the second gear 3a need to be both set to be 1.2mm or more, and the entire weight of the oil-gas separation device is large.

In a second aspect, in the embodiment of the invention, the partition 4 is arranged between the first gear 2 and the second gear 3, the partition 4 forming a centrifugal fan by means of the first gear 2 and the second gear 3, such that the minimum radius of rotation of the centrifugal fan is the radius of the smaller one of the first gear 2 and the second gear 3. Whereas in the related art, the centrifugal ventilator 4a is separately provided on the side of the first gear 2a remote from the second gear 3a, so that the radius of rotation of the centrifugal ventilator 4a is the radius of the end plate 43a thereof.

Moreover, because the radius of the end plate 43a is usually smaller than the radius of the smaller one of the first gear 2 and the second gear 3 due to the influence of the interference of the components, the shafting strength and other factors, in the embodiment of the present invention, the minimum rotation radius of the centrifugal ventilator is increased, which can generate a larger centrifugal force and a larger windage effect, thereby better separating the lubricating oil in the oil-gas mixture, improving the oil-gas separation efficiency of the centrifugal ventilator, and ensuring the reliability of the engine. Meanwhile, the minimum rotating radius of the centrifugal ventilator is increased, the tangential speed around the first gear 2 and the second gear 3 is increased under the high-speed rotation, the outer edge of the partition plate 4 of the centrifugal ventilator is influenced by the tangential speed of the first gear 2 and the second gear 3, lubricating oil can be thrown out more easily, the risk that the lubricating oil is adhered to the outer edge of the partition plate 4 is reduced, the centrifugal ventilator can be effectively ensured to run for a long time, and the service life of the oil-gas separation device is prolonged.

In the third aspect, compared to the related art, in the embodiment of the present invention, since the centrifugal ventilator is formed between the first gear 2 and the second gear 3, the axial length occupied by the oil-gas separation device can be reduced, facilitating the overall layout.

In a fourth aspect, in the related art, the mating surfaces in the oil-gas separation device include the mating between the hole wall 44a of the through hole in the centrifugal ventilator 4a and the first mating surface 12a of the gear shaft 1a, the mating between the first bearing 5a and the second mating surface 13a of the gear shaft 1a, and the mating between the second bearing 6a and the third mating surface 14a of the gear shaft 1 a.

In the embodiment of the present invention, as shown in fig. 7, the mating surfaces in the oil-gas separation device include the mating between the first bearing 5 and the second mating surface 13 of the gear shaft 1 and the mating between the second bearing 6 and the third mating surface 14 of the gear shaft 1. Compared with the prior art, the embodiment of the invention omits the matching between the hole wall of the through hole in the centrifugal ventilator and the first assembling surface 12 of the gear shaft 1, can avoid the arrangement of threads or splines on the first assembling surface 12a for matching assembly, can reduce the process difficulty and the machining precision requirement, also reduces the time required by machining, does not need to consider the lubrication and cooling among assembling parts, and greatly reduces the design difficulty.

In some embodiments, as shown in fig. 8, the first gear 2 includes a first end surface 21, as shown in fig. 7, the second gear 3 includes a second end surface 31 opposite to the first end surface 21, and the spacer 4 is connected with the gear shaft 1, the first end surface 21, and the second end surface 31.

Through being connected baffle 4 with gear shaft 1, first terminal surface 21 and second terminal surface 31, can improve the stability of baffle 4, can realize more direct support to first terminal surface 21 and second terminal surface 31 simultaneously, further reduce the vibration of gear shaft 1, first gear 2, second gear 3 and baffle 4 in the rotation process, reduce the wearing and tearing between gear shaft 1, first gear 2, second gear 3 and the baffle 4.

In some embodiments, the first gear 2, the second gear 3, and the plurality of partitions 4 are fixedly connected or integrally formed.

Through fixing first gear 2, second gear 3 and a plurality of baffle 4 together, form monolithic structure, perhaps set up first gear 2, second gear 3 and a plurality of baffle 4 into integrated into one piece's structure, can avoid first gear 2, second gear 3 and a plurality of baffle 4 to produce relative vibration each other, alleviate oil-gas separation device's bulk vibration, reduce wear, improve oil-gas separation device's life, also can effectively guarantee oil-gas separation's effect.

In some embodiments, the gear shaft 1, the first gear 2, the second gear 3, and the plurality of partitions 4 are fixedly connected or integrally formed.

Through with gear shaft 1, first gear 2, second gear 3 and a plurality of baffle 4 are together fixed, form monolithic structure, or set up gear shaft 1, first gear 2, second gear 3 and a plurality of baffle 4 into integrated into one piece's structure, can effectively reduce gear shaft 1, first gear 2, second gear 3 and a plurality of baffle 4 produce relative vibration each other, reduce wear, improve oil-gas separation device's life, also can effectively guarantee oil-gas separation's effect.

In addition, in the related art, since the centrifugal ventilator 4a is assembled with the gear shaft 1a by means of assembly, relative vibration is easily generated between the centrifugal ventilator 4a and the gear shaft 1a during high-speed rotation of the gear shaft 1a, and abrasion occurs. Since the cost of parts using wear-resistant materials is high, the machining process of the gear shaft 1a is more complicated, more parts are involved in replacing the gear shaft 1a, and the replacement operation is also more complicated, it is common in the art to select a material having a hardness greater than that of the centrifugal ventilator 4a and having a greater resistance to wear in consideration of the problems of the machining process, the cost, and the replacement operation, and thus, there are more limitations in selecting materials for the centrifugal ventilator 4a and the gear shaft 1 a.

In the embodiment of the present invention, the gear shaft 1, the first gear 2, the second gear 3 and the plurality of partitions 4 are fixedly connected or integrally formed, so that vibration between the gear shaft 1 and the centrifugal ventilator formed by the first gear 2, the second gear 3 and the plurality of partitions 4 is reduced, abrasion is reduced, and the frequency of replacing components is reduced, so that more choices of materials for the gear shaft 1 and the centrifugal ventilator are available.

In some embodiments, the gear shaft 1 comprises a hollow ventilation shaft section provided with ventilation holes 11 communicating with the gap.

In some embodiments, the ventilation shaft section is provided with a plurality of ventilation holes 11, and at least one ventilation hole 11 is provided between two adjacent partition plates 4.

According to the foregoing description, compared with the related art, in the embodiment of the present invention, the axial thickness of the first gear 2 and the second gear 3 can be reduced, and on this basis, the axial length of the partition plate 4 disposed between the first gear 2 and the second gear 3 can be increased, and further, the axial length of the vent hole 11 disposed on the gear shaft 1 can be increased, and the vent area of the vent hole 11 is increased, which is beneficial to reducing the resistance of the oil-gas mixture entering the centrifugal ventilator, and improving the oil-gas separation effect.

In some embodiments, one end of the gear shaft 1 is provided with an air outlet 15, and the other end is closed. The arrangement can lead the separated gas to be discharged from one end of the gear shaft 1, and effectively control the discharge direction of the gas.

As shown in fig. 9, an air inlet 41 is formed between two adjacent partition boards 4, one end of the gear shaft 1 is provided with an air outlet 15a, and the other end is provided with a tapered structure 16, and the tapered structure 16 may be relatively independent from the gear shaft 1 or may be integrally formed with the gear shaft 1 so as to close the other end of the gear shaft 1.

The oil-gas mixture enters the centrifugal ventilator from the air inlet 41 for oil-gas separation, the separated gas can be axially discharged from the air outlet 15a, and the separated liquid can return through the air inlet 41.

In some embodiments, the plurality of partitions 4 are uniformly arranged along the circumferential direction of the gear shaft 1. Set up like this and to make centrifugal ventilator's whole atress more even, prevent that the uneven problem of atress from appearing in rotatory in-process, influence oil-gas separation's effect.

In the embodiment where the partition plate 4 is fixedly connected with the gear shaft 1, the first gear 2 and the second gear 3, the connection positions of the partition plate 4 and the gear shaft 1, the first gear 2 and the second gear 3 may be rounded or chamfered to enhance the connection strength.

The oil-gas separation device in each embodiment can be applied to various mechanical equipment with a lubricating system and used for realizing oil-gas separation.

Based on the oil-gas separation device in each embodiment, the invention further provides an aircraft engine, and the aircraft engine comprises the oil-gas separation device. The positive technical effects of the oil-gas separation device in the above embodiments are also applicable to the aircraft engine, and are not described herein again.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made without departing from the principles of the invention, and these modifications and equivalents are intended to be included within the scope of the claims.

Claims

1. An oil-gas separation device, comprising:

a gear shaft (1);

the first gear (2) and the second gear (3) are sequentially arranged on the gear shaft (1) along the axial direction of the gear shaft (1), and a gap is formed between the first gear (2) and the second gear (3); and

and a plurality of partition plates (4) which are arranged in the gap at intervals along the circumferential direction of the gear shaft (1).

2. Oil and gas separation device according to claim 1, characterized in that the first gear wheel (2) comprises a first end face (21), the second gear wheel (3) comprises a second end face (31) opposite to the first end face (21), and the bulkhead (4) is connected with the gear shaft (1), the first end face (21) and the second end face (31).

3. Oil-gas separation device according to claim 1, characterized in that the first gear wheel (2), the second gear wheel (3) and the plurality of bulkheads (4) are fixedly connected or integrally formed.

4. The oil-gas separation device according to claim 1, characterized in that the gear shaft (1), the first gear (2), the second gear (3) and the plurality of bulkheads (4) are fixedly connected or integrally formed.

5. Oil-gas separation device according to claim 1, characterized in that the gear shaft (1) comprises a hollow ventilation shaft section provided with ventilation holes (11) communicating with the gap.

6. Oil-gas separation device according to claim 5, characterized in that the ventilation shaft section is provided with a plurality of said ventilation holes (11), at least one of said ventilation holes (11) being provided between two adjacent partition plates (4).

7. The oil-gas separation device according to claim 1, wherein the first gear (2) has a thickness of 0.8 to 1.2mm in the axial direction; and/or the thickness of the second gear (3) along the axial direction is 0.8-1.2 mm.

8. The oil-gas separation device according to claim 1, characterized in that one end of the gear shaft (1) is provided with an air outlet (15) and the other end is closed.

9. The oil-gas separation device according to claim 1, characterized in that a plurality of said bulkheads (4) are uniformly arranged along the circumference of said gear shaft (1).

10. An aircraft engine, characterized in that it comprises an oil-gas separation device according to any one of claims 1 to 9.