CN208918704U - Gravity switch unit and aero-engine inverted flight fuel feeding air-breather containing the unit - Google Patents
Gravity switch unit and aero-engine inverted flight fuel feeding air-breather containing the unit Download PDFInfo
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- CN208918704U CN208918704U CN201821785012.XU CN201821785012U CN208918704U CN 208918704 U CN208918704 U CN 208918704U CN 201821785012 U CN201821785012 U CN 201821785012U CN 208918704 U CN208918704 U CN 208918704U
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Abstract
Aero-engine inverted flight fuel feeding air-breather the utility model relates to gravity switch unit and containing the unit, fuel feeding air-breather includes two gravity switch units and oil tank, gravity switch unit includes shell, it can be slid vertically in shell and be combined with gravity switching cylinder, first through hole I and the second through-hole I are offered on the wall of shell, first through hole II and the second through-hole II are offered on the wall of gravity switching cylinder, the upper and lower surfaces of shell are respectively connected with sealing plate, and adapter tube hole is offered on any sealing plate；The upper and lower part of oil tank is separately connected the adapter tube hole of gravity switch unit, through-hole on the shell for the gravity switch unit connecting with lubricating oil lower box part in connected state and the through-hole in the closed state that is staggered on the shell for the gravity switch unit connecting with lubricating oil upper box part pass through oil duct and connect with booster pump, and the other two through hole on two housings passes through air conduit and connect with eccentric contract.The utility model can guarantee fuel feeding and the ventilation of oil tank simultaneously.
Description
Technical field
The utility model belongs to the lubrication technical field of engine in mechanical engineering, and in particular to a kind of gravity switch unit
And the aero-engine inverted flight fuel feeding air-breather containing the unit.
Background technique
Aircraft, especially military aircraft have a requirement of various flight attitudes, and the follow-on mission under different flight attitudes
Ability brings huge challenge to the steady operation of aero gas turbine engine.
For general aero-engine, when engine inverted flight, the lubricating oil output and the ventilation of oil tank of oil tank are equal
In abnormal operating state, due to posture, lubricating oil can not be delivered to booster pump by the fuel feed pump positioned at oil tank bottom
And lubricant housings is delivered to by booster pump, the lubricating oil of each lubricant housings of engine, which supplies, at this time interrupts, and extended inverted flight can be led
Main bearing of engine and the dry grinding of each lubricant housings are caused, to generate serious engine failure.In addition, being located at the top of oil tank
Gas in oil tank also normally can not be delivered to eccentric contract to guarantee the stabilization of air pressure in oil tank, when long by snorkel
Between inverted flight to will lead to air pressure in oil tank excessively high, can not work normally, lead to engine oil system failure.
To solve the above problems, currently, the relatively advanced aero-engine in part is carried out by the way of hydraulic accumulator
The lubricating oil for being used for inverted flight is first stored in the hydraulic accumulator of certain volume by the fuel feeding under inverted flight state, by calming the anger when inverted flight
The high pressure gas of machine squeezes hydraulic accumulator and carries out lubricating oil supply.The engine little for lubricating oil supply required amount can use this
Mode, but for turbo oar engine, need a large amount of lubricating oil to input propeller control system as working fluid, if
By the way of hydraulic accumulator, volume, which needs to reach tens of liters, can just be met the requirements, and lead to hydraulic accumulator volume and again
It measures huge.Gas connection in oil tank then uses individual valve, guarantees eccentric contract and oil tank gas when inverted flight
Connection, but the device is installed on the inside of oil tank, maintainability is poor, it has not been convenient to dismantle.
Summary of the invention
For the above-mentioned deficiency of the prior art, the technical problem to be solved by the present invention is to provide a kind of switching of gravity is single
Member and the aero-engine inverted flight fuel feeding air-breather containing the unit, solve when aircraft is in inverted flight attitude angle its oil tank how
It is steady and sustained to engine lubrication delivery, while guaranteeing to guarantee the air and eccentric contract continual communication in oil tank
The problem of ventilation of oil tank, acquirement space hold is small, and weight is small, effect convenient for safeguarding.
In order to solve the above technical problems, the utility model adopts the following technical solution:
Gravity switch unit, including shell, the shell are vertical hollow straight barrel type, can be slid vertically in the shell
Be combined with gravity switching cylinder, gravity switching cylinder is also vertical hollow straight barrel type, gravity switch the outer wall of cylinder with
The inner wall of shell is corresponding；First through hole I and the second through-hole I are offered on the wall of shell respectively, gravity switches to be divided on the wall of cylinder
First through hole II and the second through-hole II are not offered, the first through hole I and first through hole II are located in same vertical plane, the
The distance of one through-hole I to housing lower surface is equal to the distance of first through hole II to gravity switching cylinder lower surface to switch in gravity
It is connected to first through hole I and first through hole II when cylinder and the concordant lower surface of shell, second through-hole I and the second through-hole II
In same vertical plane, the distance of the second through-hole I to housing upper surface is equal on the second through-hole II to gravity switching cylinder
The distance on surface is be connected to the second through-hole I and the second through-hole II when gravity switches cylinder and the concordant upper surface of shell；
The height that gravity switches cylinder is less than the height of shell, and the height difference of the two is less than under first through hole I and shell
The minimum range between minimum range and the second through-hole I and housing upper surface between surface is greater than first through hole I and first
The sum of radius of through-hole II and the sum of the second through-hole I and the radius of the second through-hole II are to guarantee any on gravity switching cylinder
Correspondence through-hole when a through-hole is connected to the corresponding through-hole on shell on another through-hole and shell is staggered closing；
The upper and lower surfaces of the shell are sealedly connected with sealing plate respectively, and adapter tube hole is offered on any sealing plate.
The utility model further relates to a kind of aero-engine inverted flight fuel feeding air-breather, including two above-mentioned gravity switchings
Unit, further includes oil tank, and the upper and lower part of oil tank passes through the adapter tube of the one-to-one connection gravity switch unit of conduit respectively
Hole, through-hole on the shell for the gravity switch unit connecting with lubricating oil lower box part in connected state and connect with lubricating oil upper box part
Gravity switch unit shell on the through-hole in the closed state that is staggered pass through oil duct and connect with booster pump, with lubricating oil
The weight for being in the through-hole for the closed state that is staggered on the shell of the gravity switch unit of lower box part connection and being connect with lubricating oil upper box part
Through-hole on the shell of power switch unit in connected state passes through air conduit and connect with eccentric contract.
The aero-engine inverted flight fuel feeding air-breather of the utility model includes two gravity switch units, will be even when use
The conduit for passing through lubricating oil upper box part and the conduit for being connected to lubricating oil lower box part are connected to the adapter tube of a gravity switch unit
Hole, due to the effect of gravity, in a vertical state, shell and gravity switching cylinder only have one in each gravity switch unit
The corresponding connection (i.e. first through hole I is connected to first through hole II or the second through-hole I is connected to the second through-hole II) of group through-hole, corresponds to
This vertical state, by leading to when previous group connection through-hole is connected to centrifugation for the gravity switch unit being connect with oil tank upper catheter
The gravity switch unit connecting with oil tank lower part conduit is connected to booster pump when previous group is connected to through-hole, realized by wind device
The fuel feeding of oil tank and ventilation under the vertical state；
When rotating another vertical state after 180 °, oil tank and two gravity switch units are in 180 ° of inversions,
Oil tank upper and lower part orientation switching (because lubricating oil will export from below always because of gravity), each gravity switch unit
Gravity switches cylinder under the effect of gravity, also corresponding to switch the through-hole being connected to shell, at this point, in each gravity switch unit
Shell is connected to another group of through-hole of gravity switching cylinder, corresponds to this vertical state, by what is connect with oil tank upper catheter
Gravity switch unit is connected to eccentric contract when previous group is connected to through-hole, and the gravity connecting with oil tank lower part conduit is cut
That changes unit is connected to booster pump when previous group is connected to through-hole；In this way, former excessively oily gravity switch unit is under this vertical state
To be oil under this vertical state by the gravity switch unit of air, Yuan Guoqi, oil tank under this vertical state is realized
Fuel feeding and ventilation.
Advanced optimize above-mentioned technical proposal, two gravity switch unit inverted relatives.
In this way, the construction of two gravity switch units is identical, simplify manufacturing process, by two gravity switch units when assembly
First through hole I is correspondingly connected to eccentric contract or booster pump by outer conduit connection again, by the of two gravity switch units
Two through-holes I are correspondingly connected to booster pump or eccentric contract by outer conduit connection again, can significantly avoid misloading.
Further, a gravity switch unit is located at the underface of another gravity switch unit, two adapter tube hole point
It is not opened in the top upper end of gravity switch unit and the lower end of lower section gravity switch unit.
In this way, the adapter tube hole of two gravity switch units is made upwardly and downwardly to carry out back-to-back inversion peace respectively when assembly
Dress, occupies less space, and the conveniently connection with the conduit of oil tank.
Further, the shell of two gravity switch units is structure as a whole and two lower sealing plates are total to plate.
In this way, two gravity switch unit manufactures are structure as a whole, globality is more preferable, reduces by two gravity switch units
Centre connection or auxiliary connection fixed respectively.
Compared with prior art, the utility model has the following beneficial effects:
1, lubricating oil when the aero-engine inverted flight fuel feeding air-breather of the utility model can realize just winged and inverted flight attitude angle
Case is steady and sustained to engine lubrication delivery, while guaranteeing for the air in oil tank to be connected with eccentric contract, ensures hair
The normal operation of motivation oil system and engine；Due to ensure that just winged and inverted flight attitude angle oil tank fuel feeding and ventilation,
When aircraft is in the just winged various attitude angles converted between inverted flight, oil supply system and engine can also be operated normally.
2, the relatively existing hand of gravity switch unit that the aero-engine inverted flight fuel feeding air-breather of the utility model uses
Section, structure is simple, and space hold is small, and weight is small, suitable for the application on aircraft, and independently of oil tank outside, it is convenient for safeguarding.
Detailed description of the invention
The structural schematic diagram of Fig. 1-specific embodiment gravity switch unit；
The portion the A partial enlarged view of Fig. 2-Fig. 3；
The structural schematic diagram of Fig. 3-specific embodiment aero-engine inverted flight fuel feeding air-breather；
Wherein, shell 1, first through hole I 11, the second through-hole I 12, upper sealing plate 13, lower sealing plate 14 take over hole 15, and gravity is cut
Creeling body 2, first through hole II 21, the second through-hole II 22, pressure inlet 3, oil tank 4, air conduit 5, eccentric contract 6, lubricating oil
Conduit 7, booster pump 8.
Specific embodiment
Specific embodiment of the present utility model is described in further detail with reference to the accompanying drawing.
Referring to Fig. 1, the gravity switch unit of specific embodiment, pack housing 1, the shell 1 is vertical hollow straight barrel type,
It can be slid vertically in the shell 1 and be combined with gravity switching cylinder 2, the gravity switching cylinder 2 is also vertical hollow straight tube
Type；The outer wall that gravity switches cylinder 2 is corresponding with the inner wall of shell 1, and the height that gravity switches cylinder 2 is less than the height of shell 1；Shell
First through hole I 11 and the second through-hole I 12 are offered on the wall of body 1 respectively, offers first respectively on the wall of gravity switching cylinder 2
Through-hole II 21 and the second through-hole II 22, the first through hole I 11 and first through hole II 21 are located in same vertical plane and first
The distance of through-hole I 11 to 1 lower surface of shell is equal to the distance of first through hole II 21 to gravity switching 2 lower surface of cylinder, in weight
It is connected to first through hole I 11 and first through hole II 21 when power switching cylinder 2 and the concordant lower surface of shell 1, second through-hole I
12 and second through-hole II 22 be located in same vertical plane and the distance of the second through-hole I 12 to 1 upper surface of shell to be equal to second logical
The distance of hole II 22 to gravity switching 2 upper surface of cylinder, to make the when gravity switching cylinder 2 is concordant with the upper surface of shell 1
Two through-holes I 12 are connected to the second through-hole II 22.
It is the benchmark for measuring or demarcating that the restriction of the above-mentioned position to each through-hole, which is with the central axes of through-hole,.For weight
Power switches the height difference of cylinder 2 and shell 1, and also further requirement should be less than between 1 lower surface of first through hole I 11 and shell
Minimum range between 1 upper surface of minimum range and the second through-hole I 12 and shell, and be greater than first through hole I 11 and first and lead to
The sum of the radius of the sum of the radius in hole II 21 and the second through-hole I 12 and the second through-hole II 22, to guarantee first through hole I 11 and
Second through-hole I 12 and second (when gravity switching cylinder 2 is concordant with the lower surface of shell 1) when one through-hole II 21 is in connected state
Through-hole II 22, which is in, is staggered closed state or the second through-hole I 12 and (gravity switches when the second through-hole II 22 be in connected state
When cylinder 2 is concordant with the upper surface of shell 1) first through hole I 11 and first through hole II 21 be in the closed state that is staggered；It is wherein minimum
The distance on the distance i.e. edge of through-hole to corresponding surface, rather than central axes.Only pass through the requirement of above-mentioned height difference, ability
Guarantee that gravity switching cylinder 2 when slide handover connected relation, can guarantee that a hole is the same of connected state in shell 1
When, another hole is in completely enclosed state, and the completely enclosed state refers to that hole corresponding on shell is staggered and phase completely
Two Kong Jun being mutually staggered are corresponded to wall on gravity switching cylinder 2 and shell 1 and are closed.
The upper and lower surfaces of the shell 1 are sealedly connected with horizontal upper sealing plate 13 and lower sealing plate 14, upper envelope respectively
The middle part of plate 13 offers adapter tube hole 15, and the adapter tube hole 15 is connected to the inner cavity of shell 1 and gravity switching cylinder 2, upper sealing plate
13 and lower sealing plate 14 make shell 1 become one sealing cavity body structure, while be also used for limitation gravity switching cylinder 2 slide up and down
Stroke.
Wherein, it is equipped with and is connected to adapter tube hole 15, first through hole I 11 and I 12 corresponding position of the second through-hole on 1 outer wall of shell
Pressure inlet 3 in order to external catheter.
When implementation, the horizontal cross sectional geometry of shell 1 can rectangular, round or other shapes, the utility model with no restriction,
As long as straight tube form, so that gravity switching cylinder 2 can be slided up and down along its inner wall.Gravity switches the outer of cylinder 2
Wall is corresponding with the inner wall of shell 1, plays closed effect, when the lower surface of gravity switching cylinder 2 is abutted with lower sealing plate 14,
First through hole II 21 is connected to the first through hole I 11 of shell 1, and the first through hole I 11 and shell 1 and gravity of shell 1 switch cylinder 2
Inner cavity is in connected state, and because the height of gravity switching cylinder 2 be less than shell 1 height and the two height difference it is specific
Second through-hole I 12 of limitation, the second through-hole II 22 and shell 1 of gravity switching cylinder 2 is staggered naturally, and gravity switches cylinder 2
Outer wall is corresponding with the inner wall of shell 1, and the second through-hole I 12 of shell 1 is made to be in closing with shell 1 and gravity switching 2 inner cavity of cylinder
State.When inversion, due to gravity, gravity switches cylinder 2 and slides along the inner wall of shell 1, when the upper table of gravity switching cylinder 2
When face is abutted with upper sealing plate 13, the second through-hole II 22 is connected to the second through-hole I 12 of shell 1, first through hole II 21 and shell
The first through hole I 11 of body 1 is staggered naturally, and the first through hole II 21 of shell 1 is closed.
Certainly, when the horizontal cross sectional geometry of shell 1 is round, anti-rotation measure is needed, prevents gravity switching cylinder 2 in shell
It rotates to it in body 1.
Referring to fig. 2, Fig. 3, the utility model also provide a kind of aero-engine inverted flight fuel feeding air-breather, including on two
The gravity switch unit stated, further includes oil tank 4, and two gravity switch units are in the positional relationship of inverted relative, a gravity
Switch unit is located at the underface of another gravity switch unit, in the present embodiment, makes the adapter tube hole of the gravity switch unit of top
15 upward, and first through hole I 11 and first through hole II 21 are in connected state, and the second through-hole I 12 and the second through-hole II 22 are in
Be staggered closed state, due to the positional relationship and gravity of inverted relative, 15 court of adapter tube hole of the gravity switch unit of lower section
Under, the second through-hole I 12 and the second through-hole II 22 are in connected state, and first through hole I 11 and first through hole II 21, which are in, to be staggered
The conduit for being connected to 4 top of oil tank is connected to the adapter tube hole 15 of top gravity switch unit, will be connected to cunning by closed state
The conduit of 4 lower part of fuel tank is connected to the adapter tube hole 15 of lower section gravity switch unit；By the first through hole I 11 of two gravity switch units
It is correspondingly connected to eccentric contract 6 again by the connection of air conduit 5, the second through-hole I 12 of two gravity switch units is passed through into cunning
The connection of oil-piping layout 7 is correspondingly connected to booster pump 8 again, conduit, top gravity switch unit of the air in oil tank 4 through upper part
It is connected to from the first through hole I 11 of top gravity switch unit with eccentric contract 6, guarantees ventilation, the lubricating oil in oil tank 4 is through it
Second through-hole I 12 of the conduit of lower part, lower section gravity switch unit gravity switch unit from below is connect with booster pump 8, is passed through
Lubricating oil is delivered to by booster pump 8 needs lubricant housings.
When inverted flight, then entire oil tank 4 and two gravity switch units are in 180 ° of inversions, 4 upper and lower part orientation of oil tank
Switching, lubricating oil because gravity will export always from below, make in gravity by the gravity switching cylinder 2 of two gravity switch units
It is also corresponding to switch the through-hole that be connected to shell 1 under, be in it is just winged when the identical structural form and course of work, only by
The conduit come out is exchanged in the lubricating oil and air come out from oil tank 4, gravity switch unit excessively oily is in inverted flight when Yuan Zhengfei
When for by air, the gravity switch unit of Yuan Guoqi be oil in inverted flight, was just flown and inverted flight attitude angle in this way, ensuring that
When oil tank 4 fuel feeding and ventilation.
By the connection type of embodiment and the use process of introduction it is found that when implementing, if two gravity switch units
For split type structure, hole 15 is taken over either being provided with upper sealing plate 13, is also possible to be provided with lower sealing plate 14, have no effect on
The process and effect of 4 fuel feeding of oil tank and ventilation.When implementation, two gravity switch units may not be inverted relationship and/
Or relationship is placed up and down, and it can also be side by side with towards placing, as long as vertical simultaneously use, corresponding each conduit is correctly connected
Guarantee using effect.When implementation, if two gravity switch units are in the positional relationship of turned upside down shown in Fig. 2, during fabrication,
Can also be processed as one the shell 1 of two gravity switch units structure, the lower sealing plate 14 of two such gravity switch unit
One can be shared, and globality is more preferable, the intermediate connection of two gravity switch units can be reduced, reduced solid respectively aboard
The fixed auxiliary connection used.
The utility model is the restriction of vertical hollow straight barrel type to shell 1 and gravity switching cylinder 2, is to guarantee weight
Power switching cylinder 2 can slide vertically in shell 1, when implementation, by the outer wall of shell 1 and/or the inner wall of gravity switching cylinder 2
The structure type of nonlinear pattern is replaced with, also because being in the scope of the claims of the utility model.
Finally, it is stated that above embodiments are merely intended for describing the technical solutions of the present application, but not for limiting the present application, although ginseng
The utility model is described in detail according to preferred embodiment, those skilled in the art should understand that, it can be to this
The technical solution of utility model is modified or replaced equivalently, without departing from the objective and model of technical solutions of the utility model
It encloses, should all cover in the scope of the claims of the utility model.
Claims (5)
1. gravity switch unit, it is characterised in that: including shell (1), the shell (1) is vertical hollow straight barrel type, described
It can slide vertically in shell (1) and be combined with gravity switching cylinder (2), gravity switching cylinder (2) is also vertical hollow straight
Cartridge type, the outer wall that gravity switches cylinder (2) are corresponding with the inner wall of shell (1)；First through hole is offered respectively on the wall of shell (1)
I (11) and the second through-hole I (12), gravity switching cylinder (2) wall on offer first through hole II (21) and the second through-hole respectively
II (22), the first through hole I (11) and first through hole II (21) are located in same vertical plane, first through hole I (11) to shell
The distance of body (1) lower surface is equal to the distance of first through hole II (21) to gravity switching cylinder (2) lower surface to switch in gravity
It is connected to first through hole I (11) and first through hole II (21) when cylinder (2) and the concordant lower surface of shell (1), described second is logical
Hole I (12) and the second through-hole II (22) are located in same vertical plane, the distance of the second through-hole I (12) to shell (1) upper surface
Equal to the second through-hole II (22) to the distance of gravity switching cylinder (2) upper surface to switch cylinder (2) and shell (1) in gravity
It is connected to the second through-hole I (12) with the second through-hole II (22)；The height that gravity switches cylinder (2) is less than shell
(1) height, the height difference of the two are less than minimum range between first through hole I (11) and shell (1) lower surface and the
Minimum range between two through-holes I (12) and shell (1) upper surface is greater than first through hole I (11) and first through hole II (21)
The sum of radius of the sum of radius and the second through-hole I (12) and the second through-hole II (22) is to guarantee in gravity switching cylinder (2)
Correspondence through-hole when any one through-hole is connected to the corresponding through-hole on shell (1) on another through-hole and shell (1) is staggered closing；
The upper and lower surfaces of the shell (1) are sealedly connected with sealing plate respectively, and adapter tube hole (15) is offered on any sealing plate.
2. aero-engine inverted flight fuel feeding air-breather, it is characterised in that: including two gravity switchings as described in claim 1
Unit, further includes oil tank (4), and the upper and lower part of oil tank (4) passes through the one-to-one connection gravity switch unit of conduit respectively
Adapter tube hole (15), through-hole on the shell (1) for the gravity switch unit being connect with oil tank (4) lower part in connected state and
Through-hole in the closed state that is staggered on the shell (1) for the gravity switch unit connecting with oil tank (4) top passes through lubricating oil
Conduit (7) is connect with booster pump (8), in the envelope that is staggered on the shell (1) for the gravity switch unit connecting with oil tank (4) lower part
The through-hole of connected state is on the shell (1) of the through-hole of closed state and the gravity switch unit connecting with oil tank (4) top
It is connect by air conduit (5) with eccentric contract (6).
3. aero-engine inverted flight fuel feeding air-breather according to claim 2, it is characterised in that: two gravity switch units
Inverted relative.
4. aero-engine inverted flight fuel feeding air-breather according to claim 3, it is characterised in that: a gravity switch unit
Positioned at the underface of another gravity switch unit, two adapter tube hole (15) is opened in the upper end of top gravity switch unit respectively
With the lower end of lower section gravity switch unit.
5. aero-engine inverted flight fuel feeding air-breather according to claim 4, it is characterised in that: two gravity switch units
Shell (1) be structure as a whole and adjacent sealing plate is total to plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821785012.XU CN208918704U (en) | 2018-10-31 | 2018-10-31 | Gravity switch unit and aero-engine inverted flight fuel feeding air-breather containing the unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821785012.XU CN208918704U (en) | 2018-10-31 | 2018-10-31 | Gravity switch unit and aero-engine inverted flight fuel feeding air-breather containing the unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208918704U true CN208918704U (en) | 2019-05-31 |
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ID=66711235
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821785012.XU Active CN208918704U (en) | 2018-10-31 | 2018-10-31 | Gravity switch unit and aero-engine inverted flight fuel feeding air-breather containing the unit |
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| CN (1) | CN208918704U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109252963A (en) * | 2018-10-31 | 2019-01-22 | 重庆天骄航空动力有限公司 | Gravity switch unit and aero-engine inverted flight fuel feeding air-breather containing the unit |
| CN111846256A (en) * | 2020-07-29 | 2020-10-30 | 贵州航天精工制造有限公司 | Reverse-flying valve structure of flexible oil tank and installation method |
-
2018
- 2018-10-31 CN CN201821785012.XU patent/CN208918704U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109252963A (en) * | 2018-10-31 | 2019-01-22 | 重庆天骄航空动力有限公司 | Gravity switch unit and aero-engine inverted flight fuel feeding air-breather containing the unit |
| CN109252963B (en) * | 2018-10-31 | 2023-11-07 | 重庆天骄航空动力有限公司 | Gravity switching unit and aeroengine reverse-flying oil supply and ventilation device comprising same |
| CN111846256A (en) * | 2020-07-29 | 2020-10-30 | 贵州航天精工制造有限公司 | Reverse-flying valve structure of flexible oil tank and installation method |
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