Ventilation and pressure maintaining structure for lubricating oil tank of aero-engine

Abstract

The invention discloses a ventilation and pressure maintaining structure for a lubricating oil tank of an aero-engine. The ventilation and pressure maintaining structure for the lubricating oil tank of the aero-engine is mounted on the lubricating oil tank and can play a role in maintaining pressure and preventing oil from entering during reverse flying. The pressure maintaining valve assembly fixed on the pipe is used for maintaining the pressure of gas in the lubricating oil tank, exhausting is started only when the pressure of the gas in the lubricating oil tank is higher than a certain pressure, sealing is conducted when the pressure of the gas is lower than the certain pressure to achieve pressure maintaining of the lubricating oil tank, and the situation that before-pumping pressure of a booster pump on the lubricating oil tank is reduced, lubricating oil supplementing is not facilitated is avoided. The problem that the pre-pumping pressure of a booster pump on lubricating oil tank oil is reduced in a high-altitude flight state is solved; and meanwhile, the pipe fixing structure can only exhaust air in a forward flying or reverse flying state, so that the lubricating oil is prevented from entering, and the problem that the lubricating oil easily flows into an accessory transmission casing is solved.

Description

Technical Field

[0001] The invention relates to a ventilation and pressure-maintaining structure for an aero-engine lubricating oil box, belonging to the technical field of aero-engines. Background Art

[0002] The oil tank is an important working component of the aircraft engine lubrication system. It is used to store a specified amount of lubricating oil circulating in the engine lubrication system and replenish the engine lubrication system with lubricating oil through a booster pump according to the lubricating oil consumption.

[0003] There is a vent pipe in the oil box connected to the engine accessory transmission case, and the engine accessory transmission case has an exhaust pipe connected to the atmosphere for exhaust, see Chinese Patent Publication No. CN108131202A. In high-altitude flight, the air pressure is low at high altitudes. The oil box is connected to the outside atmosphere through the vent pipe, the engine accessory transmission case, and the exhaust pipe, which easily causes the oil box to be in a low-pressure state, reducing the pump pressure before the booster pump on the oil in the oil box, which is not conducive to replenishing the oil; at the same time, in the inverted flight state, the oil is easy to flow from the vent pipe into the accessory transmission case, causing abnormalities in the lubrication system. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a ventilation and pressure maintaining structure for an aircraft engine oil tank.

[0005] The present invention is achieved through the following technical solutions.

[0006] The present invention provides an aircraft engine oil box ventilation and pressure maintaining structure, comprising:

[0007] The oil tank ventilation and pressure-maintaining structure of an aircraft engine oil tank can maintain pressure after being installed in the oil tank and prevent oil from entering during inverted flight.

[0008] Includes: fixing of the pipe to prevent lubrication oil from entering during inverted flight;

[0009] A pressure-maintaining valve assembly is fixed for maintaining pressure, and a pressure-maintaining valve assembly is fixed on the pipe.

[0010] The pipe is fixed with two vertically parallel sections, namely a vertical section A and a vertical section B. The vertical section A and the vertical section B are connected through a horizontal section. A pressure-maintaining valve assembly is installed at the fixed end of the horizontal section.

[0011] The vertical section A fixed has a stepped through hole, the top part of the vertical section A fixed is larger, the top opening of the vertical section A fixed is connected with a plug A fixed, a slidable sliding piston A fixed is installed in the vertical section A fixed, and the bottom opening of the vertical section A fixed is open.

[0012] The vertical section B fixed has a stepped through hole inside, the bottom part of the vertical section B fixed is larger, the bottom opening of the vertical section B fixed has a plug B fixed, a slidable sliding piston B fixed is installed inside the vertical section B fixed, and the top opening of the vertical section B fixed is in an open state.

[0013] In the upright flight attitude, the gas in the lubricating oil tank passes through the fixed top port of the vertical section B via the fixed horizontal section to the fixed pressure-maintaining valve assembly, and the plug A is fixed in the fixed bottom port of the vertical section A to block it; in the inverted flight attitude, the fixed bottom port of the vertical section A is flipped upward, and the fixed top port of the vertical section B is flipped downward, and the gas in the lubricating oil tank passes through the fixed bottom port of the vertical section A via the fixed horizontal section to the fixed pressure-maintaining valve assembly, and the vertical section B is fixed in the plug B to block it, so that only exhaust can be carried out when the pipe is fixed in the upright or inverted flight state, and lubricating oil is prevented from entering.

[0014] The pressure-maintaining valve assembly is fixed, including a pipe joint fixed with a hollow interior, and a step-shaped through hole is provided inside the pipe joint fixed.

[0015] A spring fixer is installed on the first step of the inner through hole of the pipe joint fixer, a gasket fixer is installed on the left side of the spring fixer, a valve seat fixer is installed on the left side of the gasket fixer, the valve seat fixer is provided with an exhaust through hole, a valve sealing gasket fixer is clamped on the valve seat fixer, and after the valve sealing gasket fixer is subjected to the air pressure of the lubricating oil tank, the valve sealing gasket fixer is displaced to the right side through the valve seat fixer and the gasket fixer, pressing the spring fixer to be clamped.

[0016] The second step of the inner through hole of the pipe joint is fixed with a bushing through a sealing ring B. The bushing is in close contact with the valve gasket to form a seal. A clamping ring is installed on the left side of the bushing. The clamping ring removably clamps the bushing in the pipe joint. There is an exhaust hole inside the bushing. When the valve gasket is pressed against the bushing through the spring, the inside of the pressure-maintaining valve assembly is in a closed state. After the valve gasket is subjected to the air pressure of the oil tank, the valve gasket is displaced to the right, and a gap is generated between the close contact surfaces of the valve gasket and the bushing. The air in the oil tank flows through the bushing, valve seat, gasket and spring to be discharged. At this time, the inside of the pressure-maintaining valve assembly is in a conducting state.

[0017] The outer portion of the pipe joint fixing is screwed with a nut fixing and a sleeve nut fixing, and the outer portion of the pipe joint fixing is installed with a sealing ring A fixing between the nut fixing and the sleeve nut fixing.

[0018] The beneficial effects of the present invention are as follows: the pressure-maintaining valve assembly fixed on the pipe maintains the pressure of the gas in the oil tank, ensuring that the gas in the oil tank is not opened for exhaust until it is higher than a certain pressure, and is closed when the pressure is lower than a certain pressure to maintain the pressure of the oil tank, thereby avoiding the situation where the pressure in front of the booster pump on the oil in the oil tank is reduced, which is not conducive to replenishing the oil, and solving the problem of reducing the pressure in front of the booster pump on the oil in the oil tank in high-altitude flight. At the same time, the structure of the pipe fixing itself can only exhaust gas in the forward or inverted flight state to avoid the entry of lubricating oil, thus solving the problem of lubricating oil easily flowing into the accessory transmission casing. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a cross-sectional distribution schematic diagram of the present invention;

[0020] Figure 2 is a schematic cross-sectional distribution diagram of the valve assembly of the present invention;

[0021] In the figure: 1- pipe; 21- vertical section A; 22- vertical section B; 23- plug A; 24- sliding piston B; 25- sliding piston A; 26- horizontal section;

[0022] 4-valve assembly; 5-pipe joint; 6-nut; 7-sealing ring A; 8-jacket nut; 9-clamping ring; 10-sealing ring B; 11-bushing; 12-valve sealing gasket; 13-valve seat. DETAILED DESCRIPTION

[0023] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the description.

[0024] like Figure 1 to Figure 2 shown.

[0025] The present application discloses an aircraft engine oil tank ventilation and pressure maintaining structure, comprising:

[0026] The pipe 1 is a five-way structure, and has two vertically parallel sections, a vertical section A21 and a vertical section B22. The vertical section A21 and the vertical section B22 are connected through a horizontal section 26, and a pressure-maintaining valve assembly 4 is installed at the end of the horizontal section 26.

[0027] There is a stepped through hole in the vertical section A21, the top part of the vertical section A21 is larger, the top opening of the vertical section A21 is connected with a plug A23 by interference fit or screw-on sealing, a slidable sliding piston A25 is installed in the vertical section A21, and the bottom opening of the vertical section A21 is open.

[0028] There is a stepped through hole in the vertical section B22, the bottom part of the vertical section B22 is larger, the bottom opening of the vertical section B22 is connected with a plug B24 by interference fit or screw sealing, a slidable sliding piston B24 is installed in the vertical section B22, and the top opening of the vertical section B22 is open.

[0029] In the upright flight attitude, the oil tank gas passes through the top port of the vertical section B22 via the horizontal section 26 to the pressure-maintaining valve assembly 4. At this time, the plug A23 is blocked in the bottom port of the vertical section A21. In the inverted flight attitude, the bottom port of the vertical section A21 is turned upward, and the top port of the vertical section B22 is turned downward. The oil tank gas passes through the bottom port of the vertical section A21 via the horizontal section 26 to the pressure-maintaining valve assembly 4. At this time, the vertical section B22 is blocked in the plug B24, so that the pipe 1 can only exhaust gas in the upright or inverted flight state and prevents the entry of lubricating oil.

[0030] The pressure-maintaining valve assembly 4 on the horizontal section 26 of the pipe 1 maintains the pressure of the gas in the lubricating oil tank, ensuring that the exhaust is opened only when the pressure of the gas in the lubricating oil tank is higher than a certain pressure, and is closed when the pressure is lower than a certain pressure to maintain the pressure of the lubricating oil tank, thereby avoiding the situation where the pressure in front of the booster pump on the lubricating oil tank is reduced, which is not conducive to replenishing the lubricating oil.

[0031] The pressure-maintaining valve assembly 4 includes a hollow pipe joint 5 with a step-shaped through hole inside. The pipe joint 5 is used to communicate with the engine accessory transmission casing or the atmosphere through a ventilation pipe.

[0032] A spring 15 is installed on the first step of the through hole in the pipe joint 5, a gasket 14 is installed on the left side of the spring 15, a valve seat 13 is installed on the left side of the gasket 14, the valve seat 13 is provided with an exhaust through hole, a valve seal 12 is clamped and fixed on the valve seat 13, and after the valve seal 12 is subjected to the air pressure of the lubricating oil tank, the valve seal 12 moves through the valve seat 13 and the gasket 14 to press the spring 15 to move to the right side for clamping;

[0033] The second step of the through hole in the pipe joint 5 is installed with a bushing 11 through a sealing ring B10. The bushing 11 is in close contact with the valve seal 12 to form a seal. The clamp ring 9 is installed on the left side of the bushing 11. The clamp ring 9 clamps the bushing 11 in the pipe joint 5 in a detachable manner. There is an exhaust hole inside the bushing 11. When the valve seal 12 is pressed against the bushing 11 through the spring 15, the inside of the pressure-maintaining valve assembly 4 is in a closed state. After the valve seal 12 is subjected to the air pressure of the oil tank, the valve seal 12 moves to the right, and a gap is generated between the valve seal 12 and the bushing 11. The air in the oil tank flows through the bushing 11, the valve seat 13, the gasket 14, and the spring 15 to be discharged. At this time, the inside of the pressure-maintaining valve assembly 4 is in a conducting state. The elastic force of the spring 15 determines the pressure-maintaining capacity of the pressure-maintaining valve assembly 4 for the air inside the oil tank. Different springs 15 can be replaced to achieve different pressure-maintaining capacities.

[0034] The outside of the pipe joint 5 is screwed with a nut 6 and a sleeve nut 8, and a sealing ring A7 is installed on the outside of the pipe joint 5 between the nut 6 and the sleeve nut 8. The nut 6 and the sleeve nut 8 can clamp and fix the inner wall of the lubricating oil tank, and the sealing ring A7 plays a sealing role. Then the outside of the sleeve nut 8 is sealed and fixed to the lubricating oil tank by secondary welding; so that the left end of the pipe joint 5 with the spring 15 is in the lubricating oil tank.

Claims

1. A ventilation and pressure-maintaining structure for an aircraft engine oil tank, characterized in that: include: After being installed in the lubricating oil tank, the ventilation and pressure-maintaining structure of the aircraft engine lubricating oil tank can maintain the pressure and prevent the lubricating oil from entering during inverted flight.

2. The ventilation and pressure-maintaining structure for the aircraft engine oil tank according to claim 1, characterized in that: include: A pipe (1) through which anti-skid oil enters during inverted flight; A pressure-maintaining valve assembly (4) for maintaining pressure is installed on the pipe (1).

3. The ventilation and pressure-maintaining structure for the aircraft engine oil tank according to claim 2, characterized in that: The pipe (1) comprises two vertically parallel sections, namely a vertical section A (21) and a vertical section B (22). The vertical section A (21) and the vertical section B (22) are connected via a horizontal section (26). A pressure-maintaining valve assembly (4) is installed at the end of the horizontal section (26).

4. The ventilation and pressure-maintaining structure for the aircraft engine oil tank according to claim 3, characterized in that: The vertical section A (21) has a stepped through hole, the top portion of the vertical section A (21) is relatively large, a plug A (23) is connected to the top opening of the vertical section A (21), a slidable sliding piston A (25) is installed in the vertical section A (21), and the bottom opening of the vertical section A (21) is in an open state.

5. The ventilation and pressure-maintaining structure for the aircraft engine oil tank according to claim 3, characterized in that: The vertical section B (22) has a stepped through hole, the bottom portion of the vertical section B (22) is relatively large, a plug B (24) is provided at the bottom opening of the vertical section B (22), a slidable sliding piston B (24) is installed in the vertical section B (22), and the top opening of the vertical section B (22) is in an open state; In the upright flight attitude, the oil tank gas passes through the top opening of the vertical section B (22) through the horizontal section (26) to the pressure-maintaining valve assembly (4), and the plug A (23) is blocked in the bottom opening of the vertical section A (21); in the inverted flight attitude, the bottom opening of the vertical section A (21) is turned upward, and the top opening of the vertical section B (22) is turned downward, and the oil tank gas passes through the bottom opening of the vertical section A (21) through the horizontal section (26) to the pressure-maintaining valve assembly (4), and the vertical section B (22) is blocked in the plug B (24), so that the pipe (1) can only exhaust gas in the upright flight or inverted flight state and prevents the entry of lubricating oil.

6. The ventilation and pressure-maintaining structure for the aircraft engine oil tank according to claim 1, characterized in that: The pressure-maintaining valve assembly (4) comprises a pipe joint (5) which is hollow inside, and a step-shaped through hole is provided inside the pipe joint (5); A spring (15) is installed on the first step of the through hole in the pipe joint (5), a gasket (14) is installed on the left side of the spring (15), a valve seat (13) is installed on the left side of the gasket (14), the valve seat (13) is provided with an exhaust through hole, a valve seal (12) is clamped on the valve seat (13), and after the valve seal (12) is subjected to the air pressure of the lubricating oil tank, the valve seal (12) moves through the valve seat (13) and the gasket (14) to press the spring (15) to move to the right side for clamping; A bushing (11) is installed on the second step of the through hole in the pipe joint (5) through a sealing ring B (10). The bushing (11) and the valve seal (12) are in close contact to form a seal. A clamping ring (9) is installed on the left side of the bushing (11). The clamping ring (9) clamps the bushing (11) in the pipe joint (5) in a detachable manner. An exhaust hole is provided inside the bushing (11). When the valve seal (12) is pressed against the bushing (11) through a spring (15), the inside of the pressure-maintaining valve assembly (4) is in a closed state. After the valve seal (12) is subjected to the air pressure of the oil tank, the valve seal (12) moves to the right side, and a gap is generated between the close contact surfaces of the valve seal (12) and the bushing (11). The air in the oil tank flows through the bushing (11), the valve seat (13), the gasket (14) and the spring (15) to be discharged. At this time, the inside of the pressure-maintaining valve assembly (4) is in a conducting state.

7. The ventilation and pressure-maintaining structure for the aircraft engine oil tank according to claim 6, characterized in that: The pipe joint (5) is screwed with a nut (6) and an outer sleeve nut (8) on the outside, and a sealing ring A (7) is installed on the outside of the pipe joint (5) between the nut (6) and the outer sleeve nut (8).

Images