CN114352415A - Structure suitable for air plug of preapring-proof aircraft engine lubricating oil system - Google Patents
Structure suitable for air plug of preapring-proof aircraft engine lubricating oil system Download PDFInfo
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- CN114352415A CN114352415A CN202111594512.1A CN202111594512A CN114352415A CN 114352415 A CN114352415 A CN 114352415A CN 202111594512 A CN202111594512 A CN 202111594512A CN 114352415 A CN114352415 A CN 114352415A
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- 239000010687 lubricating oil Substances 0.000 title claims abstract description 212
- 239000003921 oil Substances 0.000 claims abstract description 59
- 238000007789 sealing Methods 0.000 claims description 12
- 230000007774 longterm Effects 0.000 claims description 10
- 238000005461 lubrication Methods 0.000 claims description 8
- 239000010705 motor oil Substances 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 6
- 238000005086 pumping Methods 0.000 claims description 6
- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 230000003068 static effect Effects 0.000 claims description 3
- 239000004636 vulcanized rubber Substances 0.000 claims description 3
- 125000006850 spacer group Chemical group 0.000 claims 1
- 239000000463 material Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 230000002238 attenuated effect Effects 0.000 description 4
- 239000000314 lubricant Substances 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 229910000639 Spring steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
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Abstract
The invention provides a structure suitable for an air plug of a pre-bulletproof aircraft engine lubricating oil system, which comprises: the lubricating oil device comprises a lubricating oil tank 1, air 2, lubricating oil 3, a lubricating oil pump oil supply stage 4, a lubricating oil pipeline 5, an anti-siphon one-way valve 6, a gas guide pipe 7 and an adjustable pressure one-way valve 8, wherein the lubricating oil tank 1 is of a tank structure, the lubricating oil 3 is filled in the lubricating oil tank 1, the air 2 is arranged at the upper part of the lubricating oil 3 in the lubricating oil tank 1, and an oil outlet is formed in the bottom of the lubricating oil tank 1 and is communicated with the lubricating oil pipeline 5; the lubricating oil pipeline 5 is sequentially provided with an adjustable pressure one-way valve 8, a lubricating oil pump oil supply stage 4 and an anti-siphon one-way valve 6 from the direction of the lubricating oil tank 1.
Description
Technical Field
The invention belongs to the technical field of aviation engine lubricating oil systems for bullets, and relates to a structure suitable for an air plug of an aviation engine lubricating oil system for pre-bulletproof use.
Background
The technical field of the lubricating oil system of the missile-used aircraft engine provides a method and a structure suitable for preventing an air plug of the lubricating oil system, and the method and the structure are used for meeting the requirements of long-term storage of the missile-used engine for more than ten years, random angle and posture of the engine during the storage, maintenance-free performance, rapid rotation before launching and successful one-time starting.
The missile aeroengine is a short-life and disposable aeroengine, is assembled on a missile and is thrown in the air by using an airplane and ignited for starting. Compared with other aero-engines, the aero-engine for the missile has the characteristics of long storage period, maintenance-free storage period and successful one-time starting; in order to meet the requirement of modern war firepower coverage, the rotary loading mode is adopted when the aircraft flies, and the engine can be stored for a long time at any angle and can be rapidly rotated and thrown. As shown in fig. 1, the air reserved in the lubricant tank for the lubricant expansion space enters the oil supply pipe and the lubricant pump oil supply stage when the engine rotates, and when the engine is started, a failure of the lubricant pump air plug may occur, resulting in a failed start of the engine.
Other aeroengines are subjected to test run inspection on the ground before starting, and the engines are kept in a horizontal state after test run, the oil supply pipeline is always below the liquid level of the lubricating oil tank, so that air cannot enter to cause air lock. The aviation engine for the bomb has no ground test-run inspection step when in use, so that a bleed air pipe is arranged in a pipeline behind a lubricating oil pump, the lubricating oil pump is used for boosting pressure when in starting, and air behind the lubricating oil pump is pressed into a lubricating oil tank through the bleed air pipe to prevent air blockage. However, since the lubricating oil remains in the bleed air line, the lubricating oil has a low temperature, a high viscosity, and a high flow resistance at the initial start, and when air is accumulated near the oil supply gear of the lubricating oil pump, sufficient post-pump pressure may not be established to discharge the lubricating oil from the bleed air line, resulting in an air lock failure.
Disclosure of Invention
In order to solve the problems, the invention provides a structure suitable for the air plug of the oil lubrication system of the pre-bulletproof aircraft engine, which can effectively ensure that the air plug fault cannot occur under the requirements of long-term storage of the bullet engine for more than ten years, arbitrary angle and posture of the engine during storage, maintenance-free property, rapid rotation before launching and one-time starting success.
The technical scheme of the invention is as follows: a structure suitable for use in a pre-ballistic aero-engine oil lubrication system air plug comprising: a lubricating oil tank 1, air 2, lubricating oil 3, a lubricating oil pump oil supply stage 4, a lubricating oil pipeline 5, an anti-siphon check valve 6, a bleed air pipe 7 and an adjustable pressure check valve 8, wherein,
the lubricating oil tank 1 is of a tank body structure, lubricating oil 3 is filled in the lubricating oil tank 1, air 2 is arranged at the upper part of the lubricating oil 3 in the lubricating oil tank 1, and an oil outlet is formed in the bottom of the lubricating oil tank 1 and is communicated with a lubricating oil pipeline 5; the lubricating oil pipeline 5 is sequentially provided with an adjustable pressure one-way valve 8, a lubricating oil pump oil supply stage 4 and an anti-siphon one-way valve 6 from the direction of the lubricating oil tank 1.
Specifically, adjustable pressure check valve 8 includes rubber ring 9, end cap 10, packing ring 11, rand 12, rubber ring 13, valve seat 14, skeleton 15, spring footstock 16, rand 17, adjusting shim 18, valve rod 19 and spring 20, wherein:
the cylindrical metal rod at the small-diameter end on the right side of the valve rod 19 penetrates through a cylindrical hole in the valve seat 14, the spring 20, the adjusting gasket 18 and the spring top seat 16 are arranged on the valve seat 14, the parts are fixed and limited by the clamping ring 17 penetrating through a clamping ring groove at the top end of the metal rod of the valve rod 19, and the spring 20 is always in a compression state, so that the cylindrical vulcanized rubber pad at the large-diameter end on the left side of the valve rod 19 is attached and pressed with a conical hole in the inner side of the valve seat 14; the plug 10, the gasket 11, the clamping ring 12 and the framework 15 are used for limiting, so that the valve is prevented from moving; the rubber ring 9 and the rubber ring 13 play a sealing role.
Specifically, under the action of negative pressure generated by suction of the lubricating oil pump oil supply stage 4, lubricating oil 3 in the lubricating oil tank 1 jacks up the pressure-adjustable one-way valve 8, then enters an oil inlet of the lubricating oil pump oil supply stage 4 along the lubricating oil pipeline 5, and after being pressurized, jacks up the anti-siphon one-way valve 6 again through the lubricating oil pipeline 5, and enters the interior of the engine for lubrication and cooling; the pressure-adjustable one-way valve 8 and the anti-siphon one-way valve 6 are always in an open state, and the lubricating oil pipeline 5 and the lubricating oil pump oil supply stage 4 are filled with lubricating oil;
when the engine is stopped, the pressure regulating one-way valve 8 and the anti-siphon one-way valve 6 are restored to the closed state, and the lubricating oil is sealed between the lubricating oil pipeline 5 and the lubricating oil pump oil supply stage 4 by the two valves;
when the engine rotates at any posture angle during subsequent long-term storage, the pressure-adjustable one-way valve 8 and the anti-siphon one-way valve 6 are always in a closed state, and lubricating oil always exists when the lubricating oil pipeline 5 enters the lubricating oil pump oil supply stage 4, so that the function of preventing air lock is achieved.
Specifically, when the engine does not work, the lubricating oil at the lubricating oil inlet and the lubricating oil at the lubricating oil outlet are in a static state, the pressure difference of the lubricating oil at the inlet and the lubricating oil at the outlet is 0, the rubber pad at the large-diameter end on the left side of the valve rod 19 is always attached to the conical surface of the valve seat 14 under the elastic force action of the spring 20, and the valve is in a closed state. When the engine works, under the pumping action of the lubricating oil pump oil supply stage 4, the lubricating oil pressure at the lubricating oil outlet is lower than that at the lubricating oil inlet, and the lubricating oil at the lubricating oil inlet enters one side of the rubber gasket of the valve rod 19 through the lubricating oil channel grooves on the framework 15 and the valve seat 14;
when the pressure difference between the inlet and the outlet of the lubricating oil reaches a certain value, under the action of the lubricating oil pressure, the valve rod 19 overcomes the elastic force of the spring 20 to move towards one side of the lubricating oil outlet at the left end, the rubber pad of the valve rod 19 is separated from the conical surface of the valve seat 14, the valve is opened, and the lubricating oil at the inlet end of the lubricating oil flows into the lubricating oil outlet through the gap between the valve rod 19 and the valve seat 14;
when the engine stops, the oil supply stage 4 of the lubricating oil pump stops pumping, the lubricating oil pressure difference between the lubricating oil inlet and the lubricating oil outlet is 0, the rubber pad of the valve rod 19 is attached to the conical surface of the valve seat 14 again under the elastic force of the spring 20, and the valve is closed.
Specifically, the check valve is provided with an adjusting shim 18 for adjusting the opening pressure of the check valve.
Specifically, the thickness of the adjustment shim 18 includes 0.5mm, 0.6mm, 0.7mm, and 1mm, and the total assembly thickness of the adjustment shim is not greater than 2.5 mm.
Specifically, the valve rod 19 is provided with a rubber gasket which is matched and tightly sealed with the conical sealing surface of the valve seat 14, and the rubber gasket is an FX-4 rubber gasket.
Specifically, the spring 20 is a GH2696 spring.
The invention has the following beneficial effects:
1. the invention ensures that lubricating oil is always in the pipeline by adding the one-way valve with adjustable pressure before the oil supply stage of the lubricating oil pump and the one-way valve with anti-siphon function which is arranged in the lubricating oil supply way before, thereby playing the role of preventing air lock.
2. The one-way valve adopts a rubber pad made of FX-4 and a spring made of GH2696, so that the performance of the valve cannot be attenuated after long-term storage.
3. The check valve adjusts the opening pressure of the valve by assembling the adjusting pads with different thicknesses and numbers, ensures that the valve is in a closed state when the pressure of the inner cavity of the lubricating oil tank is changed due to long-term storage, quick rotation and environmental temperature change of the engine, and prevents lubricating oil or air in the oil tank from leaking through the check valve.
Drawings
FIG. 1 is a schematic illustration of a prior art air lock prevention measure for a missile aircraft engine lubrication system;
FIG. 2 is a schematic view of an embodiment of the present invention with a check valve for preventing air lock;
fig. 3 is a schematic structural diagram of the adjustable pressure check valve according to the embodiment of the invention.
In the figure: 1-lubricating oil tank, 2-air, 3-lubricating oil, 4-lubricating oil pump oil supply grade, 5-lubricating oil pipeline, 6-anti-siphon check valve, 7-air guide pipe, 8-adjustable pressure check valve, 9-rubber ring, 10-plug, 11-gasket, 12-clamping ring, 13-rubber ring, 14-valve seat, 15-framework, 16-spring top seat, 17-clamping ring, 18-adjusting gasket, 19-valve rod and 20-spring.
Detailed Description
As shown in fig. 2, the present application provides a structure suitable for a gas plug of a pre-ballistic aero-engine oil lubrication system, comprising: a lubricating oil tank 1, air 2, lubricating oil 3, a lubricating oil pump oil supply stage 4, a lubricating oil pipeline 5, an anti-siphon check valve 6, a bleed air pipe 7 and an adjustable pressure check valve 8, wherein,
the lubricating oil tank 1 is of a tank body structure, lubricating oil 3 is filled in the lubricating oil tank 1, air 2 is arranged at the upper part of the lubricating oil 3 in the lubricating oil tank 1, and an oil outlet is formed in the bottom of the lubricating oil tank 1 and is communicated with a lubricating oil pipeline 5; the lubricating oil pipeline 5 is sequentially provided with an adjustable pressure one-way valve 8, a lubricating oil pump oil supply stage 4 and an anti-siphon one-way valve 6 from the direction of the lubricating oil tank 1.
As shown in fig. 3, the adjustable pressure check valve 8 includes a rubber ring 9, a plug 10, a washer 11, a collar 12, a rubber ring 13, a valve seat 14, a framework 15, a spring top seat 16, a collar 17, an adjusting gasket 18, a valve rod 19 and a spring 20, wherein:
the cylindrical metal rod at the small-diameter end on the right side of the valve rod 19 penetrates through a cylindrical hole in the valve seat 14, the spring 20, the adjusting gasket 18 and the spring top seat 16 are arranged on the valve seat 14, the parts are fixed and limited by the clamping ring 17 penetrating through a clamping ring groove at the top end of the metal rod of the valve rod 19, and the spring 20 is always in a compression state, so that the cylindrical vulcanized rubber pad at the large-diameter end on the left side of the valve rod 19 is attached and pressed with a conical hole in the inner side of the valve seat 14; the plug 10, the gasket 11, the clamping ring 12 and the framework 15 are used for limiting, so that the valve is prevented from moving; the rubber ring 9 and the rubber ring 13 play a sealing role.
Specifically, when the aircraft engine is tested before leaving the factory, the lubricating oil 3 in the lubricating oil tank 1 enters an oil inlet of the lubricating oil pump oil supply stage 4 along the lubricating oil pipeline 5 after jacking the pressure-adjustable one-way valve 8 under the action of negative pressure generated by pumping of the lubricating oil pump oil supply stage 4, and after being pressurized, the lubricating oil jacks the anti-siphon one-way valve 6 through the lubricating oil pipeline 5 again and enters the interior of the engine for lubrication and cooling; the pressure-adjustable one-way valve 8 and the anti-siphon one-way valve 6 are always in an open state, and the lubricating oil pipeline 5 and the lubricating oil pump oil supply stage 4 are filled with lubricating oil. When the engine is stopped, the pressure regulating one-way valve 8 and the anti-siphon one-way valve 6 are restored to the closed state, and the lubricating oil is sealed between the lubricating oil pipeline 5 and the lubricating oil pump oil supply stage 4 by the two valves; when the engine rotates at any posture angle during subsequent long-term storage, the pressure-adjustable one-way valve 8 and the anti-siphon one-way valve 6 are always in a closed state, and lubricating oil always exists when the lubricating oil pipeline 5 enters the lubricating oil pump oil supply stage 4, so that the function of preventing air lock is achieved.
Specifically, when the engine does not work, the lubricating oil at the lubricating oil inlet and the lubricating oil at the lubricating oil outlet are in a static state, the pressure difference of the lubricating oil at the inlet and the lubricating oil at the outlet is 0, the rubber pad at the large-diameter end on the left side of the valve rod 19 is always attached to the conical surface of the valve seat 14 under the elastic force action of the spring 20, and the valve is in a closed state. When the engine works, under the pumping action of the lubricating oil pump oil supply stage 4, the lubricating oil pressure at the lubricating oil outlet is lower than that at the lubricating oil inlet, and the lubricating oil at the lubricating oil inlet enters one side of the rubber gasket of the valve rod 19 through the lubricating oil channel grooves on the framework 15 and the valve seat 14; when the pressure difference between the inlet and the outlet of the lubricating oil reaches a certain value, under the action of the lubricating oil pressure, the valve rod 19 overcomes the elastic force of the spring 20 to move towards one side of the lubricating oil outlet at the left end, the rubber pad of the valve rod 19 is separated from the conical surface of the valve seat 14, the valve is opened, and the lubricating oil at the inlet end of the lubricating oil flows into the lubricating oil outlet through the gap between the valve rod 19 and the valve seat 14; when the engine stops, the oil supply stage 4 of the lubricating oil pump stops pumping, the lubricating oil pressure difference between the lubricating oil inlet and the lubricating oil outlet is 0, the rubber pad of the valve rod 19 is attached to the conical surface of the valve seat 14 again under the elastic force of the spring 20, and the valve is closed.
Specifically, the check valve is provided with an adjusting shim 18 for adjusting the opening pressure of the check valve.
It should be noted that the check valve with adjustable pressure is added before the oil supply stage of the lubricating oil pump, and the check valve with anti-siphon function is installed in the lubricating oil supply line before, so as to ensure that lubricating oil is always in the pipeline, and prevent air lock
It should be noted that the added check valve should ensure that the sealing is reliable and the leakage is not occurred during the whole storage period and the rotating process for more than ten years. The check valve can be reliably opened when the engine is started without regular inspection and maintenance during the whole storage period of the engine.
It should be noted that, when the storage, the rapid rotation and the environmental temperature change are ensured, the pressure in the lubricating oil tank is not greater than the valve opening pressure, and the lubricating oil in the oil tank is prevented from leaking through the one-way valve.
Specifically, the thickness of the adjustment shim 18 includes 0.5mm, 0.6mm, 0.7mm, and 1mm, and the total assembly thickness of the adjustment shim is not greater than 2.5 mm.
It should be noted that the adjusting shim 18 can be assembled with any thickness and number of adjusting shims to adjust the compression amount of the spring, and then the opening pressure of the check valve.
Specifically, the one-way valve is tightly sealed by matching a valve rod 19 with a rubber gasket with a conical sealing surface of the valve seat 14.
Specifically, the material of the rubber pad is FX-4 (material standard GJB 251A-2005).
The rubber can work in lubricating oil at the temperature of between 40 ℃ below zero and 250 ℃ for a long time, and can meet the storage period requirement of more than ten years.
The valve rod with the rubber pad is used for sealing the conical sealing surface, so that the sealing capability of the valve is improved.
Specifically, the spring 20 is a GH2696 spring.
It should be noted that the spring 20 of the check valve is in a compressed state throughout the storage period, and the elastic force is gradually attenuated as time goes up. GH2696 is selected as the material of the one-way valve spring, compared with spring steel used by a common spring, GH2696 has a lower stress relaxation rate, the one-way valve is in a compressed state all the time in the whole storage period, the elastic force is gradually attenuated along with the increase of time, and the spring made of the GH2969 material can ensure that the elastic force of the spring is almost kept unchanged after the spring is stored for a long time, so that the long-term storage requirement of an engine is met.
The principle of the invention is as follows: one-way valves opened along the flow direction of lubricating oil are arranged in front of and behind an oil supply level oil circuit of the lubricating oil pump. In the test run process before the engine leaves a factory, 2 one-way valves are all in an open state under the action of the oil supply pressure of the lubricating oil pump, and lubricating oil flows normally; after the vehicle is stopped, the lubricating oil pump stops working, the 2 one-way valves are closed, and the lubricating oil is cut off by the valves and is stored in pipelines among the 2 one-way valves and the lubricating oil pump, so that the function of preventing air lock is achieved.
As shown in figure 3, the one-way valve is designed according to the use requirements of long-time storage for more than ten years, random angle and posture of an engine during storage, free maintenance, rapid rotation before launching and successful one-time starting. A valve rod with a rubber pad is matched with the conical sealing surface to form a sealing structure, wherein FX-4 is selected as the material of the rubber pad, and GH2696 is selected as the material of the spring. The performance of the valve can not be attenuated after long-term storage, and the one-way valve is kept in a closed state when the volume of lubricating oil and air in the lubricating oil tank is changed due to storage, rotation and environmental temperature change.
In summary, the invention belongs to the technical field of the lubricating oil system of the missile aircraft engine, and provides a method and a structure suitable for preventing an air lock of the lubricating oil system, which are used for meeting the requirements of long-term storage of the missile engine for more than ten years, random angular posture of the engine during the storage, maintenance-free performance, rapid rotation before launching and successful one-time starting. The one-way valve capable of adjusting pressure is arranged at the inlet of the oil supply stage of the lubricating oil pump, so that the lubricating oil pipeline is cut off, and the problem that the engine fails to start due to the fact that air in the lubricating oil tank enters the oil supply stage of the lubricating oil pump when the engine is stored in any posture and rotates rapidly is avoided.
Claims (8)
1. A structure suitable for use in a pre-ballistic aero-engine oil lubrication system air plug, comprising: a lubricating oil tank (1), air (2), lubricating oil (3), a lubricating oil pump oil supply stage (4), a lubricating oil pipeline (5), an anti-siphon check valve (6), a bleed air pipe (7) and an adjustable pressure check valve (8), wherein,
the lubricating oil tank (1) is of a tank body structure, lubricating oil (3) is filled in the lubricating oil tank (1), air (2) is arranged at the upper part of the lubricating oil (3) in the lubricating oil tank (1), and an oil outlet is formed in the bottom of the lubricating oil tank (1) and communicated with a lubricating oil pipeline (5); the lubricating oil pipeline (5) is sequentially provided with an adjustable pressure one-way valve (8), a lubricating oil pump oil supply stage (4) and an anti-siphon one-way valve (6) from the direction of the lubricating oil tank (1).
2. The structure suitable for air plugs of aviation engine oil systems for pre-bulletproof purpose according to claim 1, wherein the adjustable pressure check valve (8) comprises a rubber ring (9), a plug (10), a gasket (11), a collar (12), a rubber ring (13), a valve seat (14), a framework (15), a spring top seat (16), a collar (17), an adjusting gasket (18), a valve rod (19) and a spring (20), wherein:
a cylindrical metal rod at the small-diameter end of the right side of the valve rod (19) penetrates through a cylindrical hole in the valve seat (14), a spring (20), an adjusting gasket (18) and a spring top seat (16) are arranged on the valve seat (14), a clamping ring (17) penetrates through a clamping ring groove at the top end of the metal rod of the valve rod (19) to fix and limit the parts, the spring (20) is always in a compression state, and a cylindrical vulcanized rubber pad at the large-diameter end of the left side of the valve rod (19) is attached to and pressed against a conical hole in the inner side of the valve seat (14); the plug (10), the gasket (11), the clamping ring (12) and the framework (15) are used for limiting, and the valve is prevented from moving; the rubber ring (9) and the rubber ring (13) are arranged; and (5) sealing.
3. The structure of the air plug of the oil system of the pre-bulletproof aircraft engine according to claim 1, wherein under the action of negative pressure generated by suction of the oil supply stage (4) of the lubricating oil pump, lubricating oil (3) in the lubricating oil tank (1) pushes open the pressure-adjustable one-way valve (8), enters an oil inlet of the oil supply stage (4) of the lubricating oil pump along the lubricating oil pipeline (5), is pressurized, and then pushes open the anti-siphon one-way valve (6) through the lubricating oil pipeline (5) again to enter the interior of the engine for lubrication and cooling; the pressure-adjustable one-way valve (8) and the anti-siphon one-way valve (6) are always in an open state, and the lubricating oil pipeline (5) and the lubricating oil pump oil supply stage (4) are filled with lubricating oil;
when the engine stops, the pressure regulating one-way valve (8) and the anti-siphon one-way valve (6) recover to be closed, and the lubricating oil is sealed between the lubricating oil pipeline (5) and the lubricating oil pump oil supply stage (4) by the two valves;
when the engine rotates at any posture angle during subsequent long-term storage, the pressure-adjustable one-way valve (8) and the anti-siphon one-way valve (6) are always in a closed state, and lubricating oil always exists when the lubricating oil pipeline (5) enters the lubricating oil pump oil supply stage (4), so that the function of preventing air lock is achieved.
4. The structure of the air plug of the oil system of the pre-bulletproof aircraft engine is characterized in that when the engine does not work, the oil at the oil inlet and the oil at the oil outlet is in a static state, the oil pressure difference between the inlet and the outlet is 0, the valve rod (19) is under the elastic force of the spring (20), the rubber pad at the large-diameter end on the left side is always attached to the conical surface of the valve seat (14), and the valve is in a closed state. When the engine works, under the suction action of the oil supply stage (4) of the lubricating oil pump, the lubricating oil pressure at the lubricating oil outlet is lower than that at the lubricating oil inlet, and the lubricating oil at the lubricating oil inlet enters one side of the rubber pad of the valve rod (19) through the framework (15) and the lubricating oil channel grooves on the valve seat (14);
when the pressure difference between the inlet and the outlet of the lubricating oil reaches a certain value, under the action of the lubricating oil pressure, the valve rod (19) overcomes the elastic action of the spring (20) to move towards one side of the lubricating oil outlet at the left end, the rubber pad of the valve rod (19) is separated from the conical surface of the valve seat (14), the valve is opened, and the lubricating oil at the lubricating oil inlet end flows into the lubricating oil outlet through the gap between the valve rod (19) and the valve seat (14);
when the engine stops, the oil supply stage (4) of the lubricating oil pump stops pumping, the lubricating oil pressure difference between the lubricating oil inlet and the lubricating oil outlet is 0, the rubber pad of the valve rod (19) is attached to the conical surface of the valve seat (14) again under the elastic action of the spring (20), and the valve is closed.
5. A structure suitable for use in a gas plug of a pre-ballistic aircraft engine oil system, according to claim 2, characterized in that the non-return valve is provided with a spacer (18) for adjusting the opening pressure of the non-return valve.
6. A structure suitable for use in a pre-ballistic aero engine oil system air lock according to claim 2 wherein the shim (18) thickness comprises 0.5mm, 0.6mm, 0.7mm, 1mm and the total shim thickness is no greater than 2.5 mm.
7. The structure of the air plug of the oil system of the pre-bulletproof aircraft engine is characterized in that the valve rod (19) is provided with a rubber gasket to be matched and sealed with the conical sealing surface of the valve seat (14), and the rubber gasket is FX-4 rubber gasket.
8. A structure suitable for use in a pre-ballistic aero-engine oil system air plug according to claim 1 wherein the spring (20) is a GH2696 spring.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115750095A (en) * | 2022-11-29 | 2023-03-07 | 中国科学院工程热物理研究所 | Liquid nitrogen-lubricating oil thermal management system for aircraft engine |
| CN115750095B (en) * | 2022-11-29 | 2024-04-26 | 中国科学院工程热物理研究所 | Liquid nitrogen-lubricating oil thermal management system of aeroengine |
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| CN115750095A (en) * | 2022-11-29 | 2023-03-07 | 中国科学院工程热物理研究所 | Liquid nitrogen-lubricating oil thermal management system for aircraft engine |
| CN115750095B (en) * | 2022-11-29 | 2024-04-26 | 中国科学院工程热物理研究所 | Liquid nitrogen-lubricating oil thermal management system of aeroengine |
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