An oil-gas separation structure

Abstract

The application relates to the technical field of aero-engines, in particular to an oil-gas separation structure. The oil-gas separation structure comprises an engine bearing seat, the engine bearing seat is internally provided with a bearing cavity; a transmission shaft is arranged in the bearing cavity, the transmission shaft is internally fixedly provided with a ventilation shaft, the ventilation shaft is internally provided with a channel for oil-gas mixture flow, and the ventilation shaft is suitable for separating lubricating oil in the oil-gas mixture through centrifugal force; a ventilation assembly is fixedly arranged on one side of the engine bearing seat and located at one end of the ventilation shaft, the ventilation assembly comprises a shell, the shell is internally provided with a cavity for oil-gas separation, the ventilation shaft is communicated with the shell, the oil-gas mixture enters the shell through the ventilation shaft, the shell is provided with an air outlet, the air outlet is communicated with a tail jet, and the oil in the oil-gas mixture is suitable for falling to the bottom of the shell through gravity.

Description

Technical Field

[0001] This invention relates to the field of aero-engine technology, and more specifically to an oil-gas separation structure. Background Technology

[0002] In existing aero-engine and gas turbine structures, multiple bearings are installed on the drive shaft. When the drive shaft rotates, it drives the bearings to rotate as well. Prolonged rotation of the bearings can cause their temperature to rise and reduce their lifespan. Therefore, the bearing housing has a device for spraying lubricating oil onto the bearings. The lubricating oil can reduce the bearing temperature and provide lubrication, thereby protecting the bearings. Some of the ball bearings sprayed onto the bearings will splash. The splashed lubricating oil mixes with the air in the bearing housing to form an oil-gas mixture. This oil-gas mixture needs to be separated to recover the lubricating oil for reuse.

[0003] In existing technologies, the separation of oil and gas mixture in the bearing cavity mainly relies on the oil and gas ejector pipe outside the main body and the oil and gas separator on the accessory gearbox. The oil and gas mixture in the bearing cavity is separated by sucking it out to the oil and gas separator. However, the oil and gas separator and the oil and gas ejector pipe increase the overall complexity and weight of the engine, ultimately affecting the performance of high-performance engines. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the prior art in which the oil-gas separator and oil-gas ejector tube increase the overall complexity and weight of the engine, and ultimately affect the performance of the high-performance engine, thereby providing an oil-gas separation structure.

[0005] To address the above problems, the present invention provides an oil-gas separation structure, comprising: An engine bearing housing, wherein the engine bearing housing has a bearing cavity; A drive shaft is disposed within the bearing cavity, and a ventilation shaft is fixedly disposed within the drive shaft. The ventilation shaft has a channel for the flow of an oil-gas mixture, and the ventilation shaft is adapted to separate the oil in the oil-gas mixture by centrifugal force. A ventilation assembly is fixedly mounted on one side of the engine bearing housing and located at one end of the ventilation shaft. The ventilation assembly includes a housing with an oil-gas separation chamber inside. The ventilation shaft is connected to the housing, and an oil-gas mixture enters the housing through the ventilation shaft. The housing has an air outlet connected to the exhaust nozzle, and the oil in the oil-gas mixture is suitable for falling to the bottom of the housing by gravity.

[0006] Furthermore, the housing has a ventilation pipe with a downward-opening outlet, the ventilation pipe is connected to the ventilation shaft, and the oil-gas mixture in the ventilation shaft is adapted to enter the housing through the ventilation pipe.

[0007] Furthermore, the outer diameter of the ventilation pipe is smaller than the inner diameter of the drive shaft. The ventilation pipe is inserted into the drive shaft, and there is a gap between the ventilation pipe and the drive shaft. The oil-gas mixture in the bearing cavity is adapted to enter the ventilation pipe through the gap, and the lubricating oil in the ventilation shaft flows into the bearing cavity through the gap.

[0008] Furthermore, it also includes: A heat insulation cover is provided on the side of the housing with an air outlet. The heat insulation cover has an annular cavity. An air inlet and an air outlet are respectively provided at the upper and lower ends of the annular cavity. The air inlet is connected to the air outlet, and the air outlet is connected to the tail nozzle.

[0009] Furthermore, a partition is provided inside the housing, which is adapted to increase the flow distance of the oil-gas mixture.

[0010] Furthermore, an oil return pipe is provided at the bottom of the housing.

[0011] Furthermore, the bearing cavity has an oil return port at its bottom.

[0012] Furthermore, it also includes: The oil return tank is connected to the oil return port and the oil return pipe, respectively.

[0013] Furthermore, the outer periphery of the housing is provided with multiple mounting structures, each with mounting holes, and the housing is fixedly mounted on the engine bearing seat via the mounting structures.

[0014] Furthermore, the outer periphery of the heat insulation cover is provided with multiple fixing structures, each having fixing holes, and the heat insulation cover is fixedly mounted on the exhaust casing via these fixing structures.

[0015] The present invention has the following advantages: 1. This invention discloses an oil-gas separation structure, including an engine bearing housing, a drive shaft, and a ventilation assembly. The engine bearing housing has a bearing cavity; the drive shaft is disposed within the bearing cavity, and a ventilation shaft is fixedly disposed within the drive shaft. The ventilation shaft has a channel for the flow of an oil-gas mixture, and the ventilation shaft is adapted to separate the lubricating oil in the oil-gas mixture by centrifugal force; the ventilation assembly is fixedly disposed on one side of the engine bearing housing and located at one end of the ventilation shaft. The ventilation assembly includes a housing, and the housing has an oil-gas separation cavity. The ventilation shaft communicates with the housing, and the oil-gas mixture enters the housing through the ventilation shaft. The housing has an air outlet, and the air outlet communicates with the exhaust nozzle. The lubricating oil in the oil-gas mixture is adapted to fall to the bottom of the housing by gravity.

[0016] This oil-gas separation structure connects the housing outlet to the engine tailpipe. Due to the higher gas velocity and lower pressure at the tailpipe outlet compared to the bearing cavity, a suction effect is created in the bearing cavity, drawing out the oil-gas mixture from the ventilation shaft. Simultaneously, the ventilation shaft rotates with the drive shaft, generating centrifugal force to separate the oil-gas mixture within the ventilation shaft. After entering the housing, the oil-gas mixture detaches from the housing due to the gravity of the lubricating oil, thus solving the problem of oil-gas separation within the bearing cavity. Furthermore, this invention has a simple structure and does not increase the overall weight of the engine.

[0017] 2. The oil-gas separation structure of this design, by setting a heat insulation cover, allows the gas discharged from the ventilation pipe to flow in the annular cavity, which can effectively isolate the temperature of the engine tail nozzle and prevent the temperature of the housing and bearing cavity from becoming too high.

[0018] 3. The oil-gas separation structure of this design has a baffle inside the shell, which increases the flow distance of the oil-gas mixture, increases the separation time, and makes the oil-gas mixture separated more thoroughly.

[0019] 4. The oil-gas separation structure of this structure has an oil return pipe at the bottom of the shell and an oil return port at the bottom of the bearing cavity, so that the separated lubricating oil can be recovered and reused. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the oil-gas separation structure in an embodiment of the present invention; Figure 2 This is a schematic diagram of the internal structure of the shell in an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of the heat insulation cover plate in an embodiment of the present invention; Figure 4 This is a schematic diagram of the oil and gas flow path of the oil-gas separation structure in an embodiment of the present invention; Explanation of reference numerals in the attached figures: 1. Engine bearing housing; 2. Bearing cavity; 3. Drive shaft; 4. Ventilation shaft; 5. Housing; 6. Air outlet; 7. Ventilation pipe; 8. Outlet; 9. Clearance; 10. Heat insulation cover; 11. Annular cavity; 12. Air inlet; 13. Air outlet; 14. Baffle; 15. Oil return pipe; 16. Mounting structure; 17. Mounting hole; 18. Fixing structure; 19. Fixing hole; 20. Exhaust casing; 21. Tail nozzle. Detailed Implementation

[0022] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0025] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0026] like Figures 1 to 4This embodiment discloses an oil-gas separation structure, including an engine bearing housing 1, a drive shaft 3, and a ventilation assembly. The engine bearing housing 1 has a bearing cavity 2; the drive shaft 3 is disposed in the bearing cavity 2, and a ventilation shaft 4 is fixedly disposed in the drive shaft 3. The ventilation shaft 4 has a channel for the flow of an oil-gas mixture and is adapted to separate the lubricating oil in the oil-gas mixture by centrifugal force; the ventilation assembly is fixedly disposed on one side of the engine bearing housing 1 and located at one end of the ventilation shaft 4. The ventilation assembly includes a housing 5, and the housing 5 has an oil-gas separation cavity. The ventilation shaft 4 is connected to the housing 5, and the oil-gas mixture enters the housing 5 through the ventilation shaft 4. The housing 5 has an air outlet 6, which is connected to the tail nozzle 21. The oil in the oil-gas mixture is adapted to fall to the bottom of the housing 5 by gravity.

[0027] Specifically, in this embodiment, the engine bearing housing 1 has two bearing cavities 2. The ventilation shaft 4 is connected to the front bearing cavity 2, and the right end of the ventilation shaft 4 is connected to the housing 5. The air outlet 6 of the housing 5 is connected to the tail nozzle 21. The gas flow rate of the tail nozzle 21 is higher, and the air pressure is lower than that inside the bearing cavity 2, which will create a suction effect on the bearing cavity 2, drawing the oil-gas mixture in the bearing cavity 2 into the ventilation shaft 4. The oil-gas mixture enters the housing 5 through the ventilation shaft 4. At the same time, the ventilation shaft 4 rotates with the drive shaft 3, generating centrifugal force, which separates the oil-gas mixture in the ventilation shaft 4. The lubricating oil is thrown onto the inner wall of the ventilation shaft 4 by centrifugal force, thus performing preliminary separation. The remaining oil-gas mixture enters the housing 5 and falls to the bottom of the housing 5 due to the gravity of the lubricating oil. The remaining oil-gas mixture is discharged from the air outlet 6. Through double separation, the lubricating oil in the oil-gas mixture can be separated to the maximum extent, which can effectively reduce pollution and reuse the recovered lubricating oil.

[0028] Furthermore, the housing 5 has a ventilation pipe 7 with a downward-opening outlet 8. The ventilation pipe 7 is connected to the ventilation shaft 4, and the oil-gas mixture in the ventilation shaft 4 is suitable for entering the housing 5 through the ventilation pipe 7.

[0029] Specifically, such as Figure 2 As shown, the ventilation pipe 7 is coaxially arranged with the housing 5. The right end of the ventilation pipe 7 is fixedly installed inside the housing 5. The ventilation pipe 7 is connected to the ventilation shaft 4 but not connected. There is a gap between the left end of the ventilation pipe 7 and the right end of the ventilation shaft 4. The oil and gas mixture in the ventilation shaft 4 can be drawn into the ventilation pipe 7. The right end of the ventilation pipe 7 is provided with a downward opening. The oil and gas mixture can enter the housing 5 through the opening. The downward opening can increase the flow distance of the oil and gas mixture in the housing 5 and increase the separation time.

[0030] Furthermore, the outer diameter of the ventilation pipe 7 is smaller than the inner diameter of the drive shaft 3. The ventilation pipe 7 is inserted into the drive shaft 3, and there is a gap 9 between the ventilation pipe 7 and the drive shaft 3. The oil-gas mixture in the bearing cavity 2 is suitable to enter the ventilation pipe 7 through the gap 9, and the lubricating oil in the ventilation shaft 4 flows into the bearing cavity 2 through the gap 9.

[0031] Specifically, such as Figure 1 As shown, the outer diameter of the ventilation pipe 7 is smaller than the inner diameter of the drive shaft 3, and the length of the ventilation shaft 4 is smaller than the length of the drive shaft 3. The ventilation pipe 7 can be inserted into the drive shaft 3 and connected to the ventilation shaft 4. There is a gap 9 between the ventilation pipe 7 and the drive shaft 3. The oil-gas mixture in the rear bearing cavity 2 can enter the ventilation pipe 7 through the gap 9 and enter the housing 5 through the ventilation pipe 7. The oil-gas mixture in the front bearing cavity 2, when passing through the ventilation shaft 4, the lubricating oil separated by centrifugal force can flow into the bearing cavity 2 through the gap 9.

[0032] It should be noted that, in this embodiment, the engine bearing housing 1 has two bearing cavities 2, the left end of the ventilation shaft 4 is connected to the front bearing cavity 2, and the rear bearing cavity 2 is connected to the ventilation shaft 4 through a gap 9.

[0033] Furthermore, it also includes: a heat insulation cover plate 10. The heat insulation cover plate 10 is disposed on the side of the housing 5 with the air outlet 6. The heat insulation cover plate 10 has an annular cavity 11. The upper and lower ends of the annular cavity 11 are respectively provided with an air inlet 12 and an air outlet 13. The air inlet 12 is connected to the air outlet 6, and the air outlet 13 is connected to the tail nozzle 21.

[0034] Specifically, such as Figure 1 and Figure 3 As shown, the heat insulation cover 10 is located on the right side of the housing 5. The inner diameter of the annular cavity 11 is larger than the outer diameter of the housing 5. The air inlet 12 of the annular cavity 11 is correspondingly arranged with the air outlet 6 of the housing 5. The oil-gas mixture discharged from the air outlet 6 enters the annular cavity 11 through the air inlet 12, flows inside the annular cavity 11, and is discharged from the air outlet 13 at the bottom of the annular cavity 11. The air outlet 13 is connected to the tail nozzle 21, and the oil-gas mixture is extracted by the pressure difference. Because the temperature of the tail nozzle 21 is high, excessively high temperature will affect the service life of the housing 5. When the oil-gas mixture flows inside the annular cavity 11, it can absorb some heat, thereby reducing the temperature.

[0035] Furthermore, a partition 14 is provided inside the housing 5, which is adapted to increase the flow distance of the oil-gas mixture.

[0036] Specifically, such as Figure 2 As shown, the baffle 14 is located at the lower end of the air outlet 6. The baffle 14 is an arc-shaped plate. The baffle 14 can block the oil-gas mixture and increase the flow distance of the oil-gas mixture, thereby increasing the separation time of the oil-gas mixture.

[0037] Preferably, in this embodiment, the housing 5 has two air outlets 6, which are waist-shaped holes.

[0038] Furthermore, an oil return pipe 15 is provided at the bottom of the housing 5.

[0039] Possesses, such as Figure 1 As shown, the return oil pipe 15 has an oil inlet section and an oil outlet section. The oil inlet section is set perpendicular to the housing 5. The right end of the oil inlet section is connected to the left side wall of the bottom of the housing 5 and communicates with the housing 5. The oil outlet section is set parallel to the housing 5. The upper end of the oil outlet section is connected to the left end of the oil inlet section.

[0040] Furthermore, the bottom of the bearing cavity 2 has an oil return port.

[0041] Furthermore, it also includes: an oil return tank. The oil return port and the oil return pipe 15 are respectively connected to the oil return tank.

[0042] Specifically, the bottom of the bearing cavity 2 at the rear end has an oil return port. The lubricating oil recovered from the oil return port and the oil return pipe 15 enters the oil return trough for storage.

[0043] Furthermore, the outer periphery of the housing 5 is provided with a plurality of mounting structures 16, each mounting structure 16 having mounting holes 17, and the housing 5 is fixedly mounted on the engine bearing housing 1 through the mounting structures 16.

[0044] Preferably, the outer periphery of the housing 5 is provided with three mounting structures 16, which are evenly arranged along the circumference of the housing 5. Each mounting structure 16 has a mounting hole 17, and the housing 5 is fixedly mounted on the engine bearing housing 1 by bolts engaging with the mounting holes 17. In other optional embodiments, the outer periphery of the housing 5 may be provided with four or five or other numbers of mounting structures 16.

[0045] Furthermore, the outer periphery of the heat insulation cover 10 is provided with a plurality of fixing structures 18, and the fixing structures 18 have fixing holes 19. The heat insulation cover 10 is fixedly mounted on the exhaust casing 20 through the fixing structures 18.

[0046] Preferably, the outer periphery of the heat insulation cover 10 is provided with eight fixing structures 18, which are evenly arranged along the circumference of the heat insulation cover 10. Each fixing structure 18 has a fixing hole 19. The exhaust casing 20 is located on the outside of the bearing seat. The heat insulation cover 10 is fixedly mounted on the exhaust casing 20 by bolts engaging with the fixing holes 19, and is fixedly connected to the housing 5. In other optional embodiments, the outer periphery of the heat insulation cover 10 may be provided with seven or nine or other numbers of fixing structures 18.

[0047] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. An oil-gas separation structure, characterized in that, include: An engine bearing housing (1) having a bearing cavity (2) inside; A drive shaft (3) is disposed in the bearing cavity (2). A ventilation shaft (4) is fixedly disposed in the drive shaft (3). The ventilation shaft (4) has a channel for the flow of oil-gas mixture. The ventilation shaft (4) is adapted to separate the lubricating oil in the oil-gas mixture by centrifugal force. A ventilation assembly is fixedly installed on one side of the engine bearing housing (1) and located at one end of the ventilation shaft (4). The ventilation assembly includes a housing (5) with an oil-gas separation chamber inside. The ventilation shaft (4) is connected to the housing (5). An oil-gas mixture enters the housing (5) through the ventilation shaft (4). The housing (5) has an air outlet (6) connected to the tail nozzle (21). The oil in the oil-gas mixture is suitable to fall to the bottom of the housing (5) by gravity.

2. The oil-gas separation structure according to claim 1, characterized in that, The housing (5) has a ventilation pipe (7) with an outlet (8) opening downwards. The ventilation pipe (7) is connected to the ventilation shaft (4), and the oil-gas mixture in the ventilation shaft (4) is suitable to enter the housing (5) through the ventilation pipe (7).

3. The oil-gas separation structure according to claim 2, characterized in that, The outer diameter of the ventilation pipe (7) is smaller than the inner diameter of the drive shaft (3). The ventilation pipe (7) is inserted into the drive shaft (3), and there is a gap (9) between the ventilation pipe (7) and the drive shaft (3). The oil-gas mixture in the bearing cavity (2) is suitable to enter the ventilation pipe (7) through the gap (9). The lubricating oil in the ventilation shaft (4) flows into the bearing cavity (2) through the gap (9).

4. The oil-gas separation structure according to claim 1, characterized in that, Also includes: A heat insulation cover (10) is provided on the side of the housing (5) with an air outlet (6). The heat insulation cover (10) has an annular cavity (11). An air inlet (12) and an air outlet (13) are respectively provided at the upper and lower ends of the annular cavity (11). The air inlet (12) is connected to the air outlet (6), and the air outlet (13) is connected to the tail nozzle (21).

5. The oil-gas separation structure according to any one of claims 1 to 4, characterized in that: The housing (5) is provided with a partition (14), which is adapted to increase the flow distance of the oil-gas mixture.

6. The oil-gas separation structure according to claim 5, characterized in that: The bottom of the housing (5) is provided with an oil return pipe (15).

7. The oil-gas separation structure according to claim 6, characterized in that: The bearing cavity (2) has an oil return port at the bottom.

8. The oil-gas separation structure according to claim 7, characterized in that, Also includes: The oil return tank is connected to the oil return port and the oil return pipe (15).

9. The oil-gas separation structure according to claim 1, characterized in that, The outer periphery of the housing (5) is provided with a plurality of mounting structures (16), and the mounting structures (16) have mounting holes (17). The housing (5) is fixedly mounted on the engine bearing seat (1) through the mounting structures (16).

10. The oil-gas separation structure according to claim 4, characterized in that: The outer periphery of the heat insulation cover (10) is provided with a plurality of fixing structures (18), and the fixing structures (18) have fixing holes (19). The heat insulation cover (10) is fixedly mounted on the exhaust casing (20) through the fixing structures (18).

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