CN109162955A - Combine automatic disengaging dynamic sealing device in a kind of engine turbine pumps labyrinth - Google Patents
Combine automatic disengaging dynamic sealing device in a kind of engine turbine pumps labyrinth Download PDFInfo
- Publication number
- CN109162955A CN109162955A CN201810986754.7A CN201810986754A CN109162955A CN 109162955 A CN109162955 A CN 109162955A CN 201810986754 A CN201810986754 A CN 201810986754A CN 109162955 A CN109162955 A CN 109162955A
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- China
- Prior art keywords
- ring
- stationary ring
- seal
- dynamic sealing
- engine
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/08—Sealings
- F04D29/086—Sealings especially adapted for liquid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K9/00—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof
- F02K9/42—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof using liquid or gaseous propellants
- F02K9/44—Feeding propellants
- F02K9/46—Feeding propellants using pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K9/00—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof
- F02K9/42—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof using liquid or gaseous propellants
- F02K9/60—Constructional parts; Details not otherwise provided for
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/02—Selection of particular materials
- F04D29/026—Selection of particular materials especially adapted for liquid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Sealing (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
Abstract
Combine automatic disengaging dynamic sealing device in a kind of engine turbine pumps labyrinth, including stationary ring (1), secondary sealing component (2), seal casinghousing (3), support ring (4), gland (5), spring (6), retaining ring (7), rotating ring (8), it is sealed when pumping and realizing turbine pump pre-cooling using end face seal between end and turbine end, seal face disengages automatically under sealed pressure effect when work, throttling is played using the formation labyrinth seal of axial plane ladder helical teeth and maintains disengaged condition, it is consumed to guarantee that rocket engine can be realized isolation helium zero, zero leakage when sealing can be realized pre-cooling, the high reliability of zero abrasion when work.
Description
Technical field
The present invention relates to a kind of engine turbine pumps labyrinths to combine automatic disengaging dynamic sealing device, belongs to and starts
Machine technical field of sealing technology.
Background technique
Since the 21th century, each spacefaring nation in the world proposes manned Mars and deep space exploration plan, high thrust fire one after another
Arrow is essential means of transport, further reduce the cost and pollute, improve reliability and carrying capacity be carrier rocket not
The developing direction come.Oxyhydrogen engine has many advantages, such as that theoretical specific impulse is high, pollution-free, cooling performance is good, of new generation at home and abroad
It is widely used in carrier rocket.
Since the density of liquid hydrogen medium is relatively low, only the 1/14 of water, hydrogen turbopump must work under very high revolving speed,
It can be just supplied to the enough pressure of engine, and since liquid hydrogen viscosity is very small, almost without greasy property, so that dynamic sealing
Working environment it is more severe.Particularly with high thrust oxyhydrogen engine, the size of hydrogen turbopump is larger, and pressure is higher, hydrogen whirlpool
The sealed pressure and sliding speed of wheel pump dynamic sealing are very high, in conclusion high thrust oxyhydrogen engine turbine pump dynamic sealing is
One technological difficulties.
When the major function of hydrogen turbopump dynamic sealing is engine pre-cooling, prevents pump end liquid hydrogen from leaking into turbine chamber, sending out
When motivation works, since turbine end is hydrogen-rich combustion gas, allow to pump end liquid hydrogen small amount of leakage to turbine chamber.Previous design hydrogen turbopump
It is close to need to be filled with isolation helium progress when often using the higher float ring seal of reliability, but being pre-chilled between two-stage floating ring
Envelope, as turbine pump structure size increases, helium consumption is sharply increased, and can be supplied using ground for core stage motor
Helium, and for two stage motors, rocket need to carry a large amount of helium, increase system complexity, reduce payload.
Summary of the invention
Technical problem solved by the present invention is high thrust motor needs to meet to helium in currently available technology
Low consumption, to sealing high request the problem of, propose a kind of engine turbine pumps labyrinth combination automatic disengaging move it is close
Seal apparatus.
The present invention solves above-mentioned technical problem and is achieved by following technical solution:
A kind of engine turbine pumps labyrinth combine automatic disengaging dynamic sealing device, including stationary ring, seal casinghousing,
Gland, spring, retaining ring, rotating ring, ladder helical teeth, the rotating ring are set to seal casinghousing top center, seal casinghousing inside
Side wall is provided with gland mounting groove and seal groove, and stationary ring is installed on gland mounting groove and seal groove towards rotating ring side, the pressure
Lid is installed in gland mounting groove, and the spring passes through gland hollow position and guarantees that stationary ring and rotating ring are convex in axially withstanding stationary ring
It plays connecting pin not falling off, the retaining ring is set to the stationary ring other side and guarantees that stationary ring position when engine does not work is stablized, and makes
Stationary ring is close to rotating ring protrusion connecting pin, and when engine operation, the chamber pressure that stationary ring, seal casinghousing, rotating ring are formed increases, and pushes
Stationary ring is disengaged along axial direction to rotating ring opposite direction, and axle sleeve is arranged in rotating ring bottom, and axle sleeve and the setting of stationary ring connecting end surface guarantee engine
The ladder helical teeth sealed when work, after engine stop work, stationary ring playback is close to rotating ring protrusion connecting pin.
It further include support ring, secondary sealing component, the support ring is installed on sealing trench bottom, and secondary sealing component is pressed in branch
Stiffening device leakproofness at the top of pushing out ring, the secondary sealing component includes capsul, O-shaped spring, and O-shaped spring is coated on capsul, O
Type spring is double-layer alloy spring.
The stationary ring is provided at two for fixing the lug of position and anti-rotation, stationary ring axial direction lug be close to seal groove and with
The sealing of secondary sealing component further progress device, radial lobes are installed on the locking groove being set on the outside of rotating ring protrusion connecting pin
It is interior,
Exist between the stationary ring and gland mounting groove end face and disengage gap, the stationary ring radial lobes and locking groove direction are dynamic
Ring opposite direction, which exists, disengages gap, and the disengagement gap is 1mm~2mm.
The seal groove wall thickness is 2.5mm~3mm, stationary ring diameter and seal casinghousing end face diameter gap be 0.05mm~
0.08mm
The static ring material is that stainless steel is brazed fine silver or silver-magnesium-nickel alloys.
The O-shaped spring material is polytetrafluoroethylene (PTFE).
The support ring material is polyether-ether-ketone.
The rotating ring is that metal material coats chromium oxide coating.
Preferably, the boss surfaces coating weldering silver or silver-magnesium-nickel alloys wearing layer.
The advantages of the present invention over the prior art are that:
(1) automatic disengaging dynamic sealing device is combined in a kind of engine turbine pumps labyrinth provided by the invention, can
Prevent liquid hydrogen from leaking to turbine chamber to meet high thrust oxyhydrogen engine turbine pump in the pre-cooling stage, and in engine start
The lower automatic disengagement of turbine pump pressure medium effect, can disengage under the low speed, realize sealing zero-abrasion, improve the work of dynamic sealing
Sealing when making reliability, while the consumption of helium zero of engine when pre-cooling may be implemented in the disengagement type dynamic sealing, and meeting pre-cooling
Performance requirement, the ladder helical teeth of use meet engine operation throttling, maintain the requirement of end face seal disengaged condition；
(2) disengagement type sealing proposed by the present invention is using stationary ring insert copper graphite and plasma spraying chromium oxide coating rotating ring
Primary seal pair is formed, meets media compatibility requirement and wear-resistant requirement, using the bullet of metal spring and polytetrafluoroethylcombination combination
Spring accumulation of energy sealing ring is as secondary sealing.Spring energy-storage sealing ring still has good elasticity and leakproofness at extremely low temperatures.And it adopts
With polytetrafluoroethylene material and metal couple, coefficient of friction can be reduced, forms good friction pair, and have media compatibility
Property, sealing axle sleeve is high-intensitive high-temperature alloy material, and mating surface is weldering silver or silver-magnesium-nickel alloys wearing layer, is had good
Friction and wear behavior and liquid hydrogen environment compatibility.
Detailed description of the invention
Fig. 1 is the sealing device schematic diagram that invention provides；
Fig. 2 is the secondary sealing component structure diagram that invention provides；
Fig. 3 is the lug anti-rotation structure schematic diagram that invention provides；
Fig. 4 is the stationary ring and seal casinghousing location structure schematic diagram that invention provides；
Fig. 5 is that the stationary ring that invention provides disengages interstitial structure schematic diagram；
Fig. 6 is the static-ring structure figure that invention provides；
Fig. 7 is the seal casinghousing structure chart that invention provides；
Specific embodiment
Combine automatic disengaging dynamic sealing device, including stationary ring 1, secondary sealing group in a kind of engine turbine pumps labyrinth
Part 2, seal casinghousing 3, support ring 4, gland 5, spring 6, retaining ring 7, rotating ring 8, the mounting means of the present apparatus are first by secondary sealing group
Part 2 and support ring 4 are mounted on seal casinghousing 3, then gland 5 is fixed on seal casinghousing 3, when fixed one on alignment gland 5
Spring 6, is mounted on seal casinghousing 3 by matrix of holes and 3 spring hole site of seal casinghousing again later.It, will after placing spring 6
Stationary ring 1 is loaded onto, and the lug of stationary ring 1 is placed in the corresponding locking groove of seal casinghousing, and stationary ring 1 is fixed on sealing using retaining ring 7
On shell 3,1 component of stationary ring is formed, is easily installed on turbine pump.
It is further described combined with specific embodiments below:
As shown in Figure 1,3 both ends of seal casinghousing are axially provided with gland mounting groove and seal groove, stationary ring 1 is installed on pressure
Lid mounting groove and seal groove side, the support ring 4 are installed on sealing trench bottom, and the press fitting of secondary sealing component 2 is pushed up in support ring 4
Portion, the stationary ring 1 are provided at two for fixing the lug of 1 position of stationary ring, the axial lug of stationary ring 1 be close to seal groove and with support
Ring 4, the sealing of 2 further progress device of secondary sealing component, the rotating ring 8 are set to 3 top center of seal casinghousing, rotating ring 8
Both ends are respectively provided with raised connecting pin, and the locking groove for further fixing stationary ring position is set on the outside of the raised connecting pin of rotating ring 8,
1 radial lobes of stationary ring, which are installed in locking groove, makes stationary ring 1 be close to rotating ring protrusion connecting pin, and the gland 5 is installed on gland installation
In slot, the spring 6 passes through 5 hollow position of gland and guarantees that stationary ring 1 is not fallen off with 8 connecting pin of rotating ring in axially withstanding stationary ring 1,
The retaining ring 7 is set to the stationary ring other side and guarantees that stationary ring 1 is stablized when engine does not work.Axle sleeve is arranged in 8 bottom of rotating ring,
Axle sleeve and the axial lug connecting end surface setting of stationary ring 1 guarantee the ladder helical teeth sealed when engine operation.
In disengagement type dynamic sealing device, spring 6 applies axial force to stationary ring 1, and stationary ring 1 and the end face of rotating ring 8 is enable to paste
Merge the seal pressure for remaining certain, end dielectric leakage is pumped when to preventing pre-cooling to turbine end.When the engine starts, quiet
The upstream and downstream pressure difference of ring increases, and stationary ring is made to overcome 6 power of spring and the frictional force of secondary sealing component 2 under the action of pressure difference certainly
It is dynamic to disengage.When the engine is working, throttling action is played in the labyrinth seal of axle sleeve and lugs contact end face composition, maintains stationary ring 1
Upstream and downstream pressure difference guarantees that end face seal is in disengaged condition.When engine cutoff, pressure medium is reduced, 1 both ends of stationary ring
Pressure difference is reduced to certain degree, and stationary ring 1 is re-closed under the active force of spring 6 and effectively sealed, to realize engine
Re-lighting.
The stationary ring 1 of the disengagement type dynamic sealing is designed using overbalance type, and balance diameter is greater than 8 connecting pin outer diameter of rotating ring.When
When 1 pressure difference of stationary ring increases, the fluid acted on stationary ring 1 is pushed power open and is also increased.
The primary seal of the disengagement type dynamic sealing is the end face seal formed between rotating ring 8, stationary ring 1, using firmly to soft sealing
Material, rotating ring 8 is using spraying chromium oxide, and stationary ring, as shown in Fig. 6 a, 6b, using insert graphite ring structure, graphite material is necessary
Shock resistance with higher.
The labyrinth seal of disengagement type sealing is formed by stationary ring 1 with axle sleeve, and labyrinth seal uses ladder helical teeth, on axle sleeve
Labyrinth teeth is set, the ladder-like sealing surface of setting at 1 pair of stationary ring position.In order to prevent firmly to touching mill firmly, and meet hydrogen ring
Media compatibility under border, axle sleeve use high-temperature alloy material, and stationary ring 1 is using stainless steel soldering fine silver or silver-magnesium-nickel alloys material.
As shown in Fig. 2, secondary sealing component 2 need to adapt to work in the high and low temperature environment of low temperature liquid hydrogen, high-temperature fuel gas, therefore use
6 accumulation of energy sealing ring of spring, sealing ring use reinforced TFE material, and spring 6 uses double-layer spring, and material is high temperature conjunction
Gold.
The roughness of the secondary sealing component 2 and 3 contact plane of seal casinghousing, secondary sealing component 2 and 1 contact plane of stationary ring
No more than 0.4.
Secondary sealing component 2 should not be too large with 1 matching allowance of stationary ring, starting and mobile frictional force control low temperature under under be
300-600N range.
Spring energy-storage sealing ring enters in the fit-up gap of seal casinghousing 3 and stationary ring 1 under high pressure effect in order to prevent, close
It placed support ring 4 between seal and seal casinghousing 3.
Spring energy-storage sealing ring is affected by vibration at work and be detached from sealing surface in order to prevent, and gland 5 is arranged to spring
Accumulation of energy sealing ring is limited.Gland 5 is screwed on seal casinghousing 3, and a series of through-holes are also set up on gland 5, this
The quantity of a little through-holes and position are corresponding with the spring eye on seal casinghousing 3, for placing spring 6, seal casinghousing 3 such as Fig. 7 a, 7b
It is shown.
Clamping stagnation, 1 balance diameter of stationary ring and 3 positioning surface of seal casinghousing are generated when as shown in figure 4, stationary ring 1 is mobile in order to prevent
Between diametric clearance be 0.05mm~0.08mm, positioning surface axial length 2.5mm~3mm.
The design of spring force must assure that in pre-cooling, primary seal has enough seal pressures to guarantee the close of medium
Envelope, in engine cutoff, can overcome the frictional force of secondary sealing component 2 to re-close stationary ring with rotating ring, meet engine
It reuses.
As shown in figure 5, stationary ring 1 is moved to be connect with 3 end face of seal casinghousing after sealed environment disengages automatically under differential pressure action
It touches and realizes braking, and control sealing and disengage gap as 1mm~2mm, as shown in figure 3, the lug on stationary ring 1 is used for anti-rotation,
Retaining ring 7 is installed, it is therefore an objective to which preventing under abnormal conditions graphite that sharply abrasion occurs causes on rotating ring 8 and stationary ring 1 on seal casinghousing 3
Metal touches mill, in addition 1 component of stationary ring can be assembled under the effect of retaining ring 7, convenient for test and assembly.
Unspecified part of the present invention belongs to common sense well known to those skilled in the art.
Claims (10)
1. automatic disengaging dynamic sealing device is combined in a kind of engine turbine pumps labyrinth, it is characterised in that: including stationary ring
(1), seal casinghousing (3), gland (5), spring (6), retaining ring (7), rotating ring (8), ladder helical teeth (9), the rotating ring (8) are set to
Seal casinghousing (3) top center, seal casinghousing (3) inside side walls are provided with gland mounting groove and seal groove, stationary ring (1) peace
Loaded on gland mounting groove and seal groove towards rotating ring (8) side, the gland (5) is installed in gland mounting groove, the spring
(6) it passes through gland (5) hollow position and guarantees that stationary ring (1) does not take off with the raised connecting pin of rotating ring (8) in axially withstanding stationary ring (1)
It falls, the retaining ring (7) is set to the stationary ring other side and guarantees that stationary ring (1) position when engine does not work is stablized, and makes stationary ring (1)
It is close to rotating ring (8) raised connecting pin, when engine operation, chamber pressure that stationary ring (1), seal casinghousing (3), rotating ring (8) are formed
Increase, stationary ring (1) is pushed to disengage along axial direction to rotating ring (8) opposite direction, axle sleeve is arranged in rotating ring (8) bottom, and axle sleeve and stationary ring (1) are even
The ladder helical teeth (9) for guaranteeing to seal when engine operation is arranged in contact surface, and after engine stop work, stationary ring (1) is playbacked and moved
It is close to ring (8) protrusion connecting pin.
2. automatic disengaging dynamic sealing device is combined in a kind of engine turbine pumps labyrinth according to claim 1,
It is characterized by also including support ring (4), secondary sealing component (2), the support ring (4) is installed on sealing trench bottom, secondary sealing
Component (2) press fitting stiffening device leakproofness at the top of the support ring (4), the secondary sealing component (2) includes capsul (201), O-shaped
Spring (202), O-shaped spring (202) are coated on capsul (201), and O-shaped spring (202) is double-layer alloy spring.
3. automatic disengaging dynamic sealing device is combined in a kind of engine turbine pumps labyrinth according to claim 2,
It is characterized by: the stationary ring (1) is provided at two for fixing the lug of position and anti-rotation, stationary ring (1) axial direction lug is close to
Seal groove is simultaneously sealed with secondary sealing component (2) further progress device, and radial lobes, which are installed on, is set to rotating ring (8) protrusion connection
In the locking groove for holding outside.
4. automatic disengaging dynamic sealing is combined in a kind of engine turbine pumps labyrinth according to claim 1 or 2 or 3
Device, it is characterised in that: exist between the stationary ring (1) and gland (5) mounting groove end face and disengage gap, the stationary ring (1) is radial
Lug and locking groove exist towards rotating ring (8) opposite direction disengages gap, and the disengagement gap is 1mm~2mm.
5. automatic disengaging dynamic sealing device is combined in a kind of engine turbine pumps labyrinth according to claim 3,
It is characterized by: the seal groove wall thickness is 2.5mm~3mm, stationary ring (1) diameter is with seal casinghousing end face diameter gap
0.05mm~0.08mm.
6. automatic disengaging dynamic sealing device is combined in a kind of engine turbine pumps labyrinth according to claim 5,
It is characterized by: stationary ring (1) material is that stainless steel is brazed fine silver or silver-magnesium-nickel alloys.
7. automatic disengaging dynamic sealing device is combined in a kind of engine turbine pumps labyrinth according to claim 2,
It is characterized by: O-shaped spring (202) material is polytetrafluoroethylene (PTFE).
8. automatic disengaging dynamic sealing device is combined in a kind of engine turbine pumps labyrinth according to claim 1,
It is characterized by: support ring (4) material is polyether-ether-ketone.
9. automatic disengaging dynamic sealing device is combined in a kind of engine turbine pumps labyrinth according to claim 1,
It is characterized by: the rotating ring (8) is that metal material coats chromium oxide coating.
10. automatic disengaging dynamic sealing device is combined in a kind of engine turbine pumps labyrinth according to claim 1,
It is characterized by: the boss surfaces coating weldering silver or silver-magnesium-nickel alloys wearing layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810986754.7A CN109162955B (en) | 2018-08-28 | 2018-08-28 | End surface labyrinth combined automatic disengaging type dynamic sealing device for engine turbo pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810986754.7A CN109162955B (en) | 2018-08-28 | 2018-08-28 | End surface labyrinth combined automatic disengaging type dynamic sealing device for engine turbo pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109162955A true CN109162955A (en) | 2019-01-08 |
| CN109162955B CN109162955B (en) | 2021-03-26 |
Family
ID=64896992
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810986754.7A Active CN109162955B (en) | 2018-08-28 | 2018-08-28 | End surface labyrinth combined automatic disengaging type dynamic sealing device for engine turbo pump |
Country Status (1)
| Country | Link |
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| CN (1) | CN109162955B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112096865A (en) * | 2020-09-08 | 2020-12-18 | 中国航发沈阳黎明航空发动机有限责任公司 | Double-linkage back-to-back assembled elastic sealing structure for aero-engine |
| CN112145471A (en) * | 2020-10-22 | 2020-12-29 | 航天科工火箭技术有限公司 | Gas disengaging type combined dynamic sealing device |
| CN113027810A (en) * | 2019-12-27 | 2021-06-25 | 北京星际荣耀空间科技股份有限公司 | Energy storage sealing structure and dynamic sealing device for high-pressure easily-vaporized medium |
| CN113294376A (en) * | 2021-06-29 | 2021-08-24 | 哈尔滨工业大学 | Balance seal for nuclear main pump and manufacturing method thereof |
| CN113958535A (en) * | 2021-09-02 | 2022-01-21 | 西安航天动力研究所 | Impeller pressure drop type disengaging sealing device for liquid rocket engine |
| CN114508592A (en) * | 2019-11-08 | 2022-05-17 | 成都一通密封股份有限公司 | Recoverable gas sealing device and method |
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| CN108194406A (en) * | 2017-12-28 | 2018-06-22 | 西安航天动力研究所 | It is a kind of can the late release moment mechanically-sealing apparatus |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114508592A (en) * | 2019-11-08 | 2022-05-17 | 成都一通密封股份有限公司 | Recoverable gas sealing device and method |
| CN114508592B (en) * | 2019-11-08 | 2024-06-11 | 成都一通密封股份有限公司 | Recoverable gas sealing device and method |
| CN113027810A (en) * | 2019-12-27 | 2021-06-25 | 北京星际荣耀空间科技股份有限公司 | Energy storage sealing structure and dynamic sealing device for high-pressure easily-vaporized medium |
| CN112096865A (en) * | 2020-09-08 | 2020-12-18 | 中国航发沈阳黎明航空发动机有限责任公司 | Double-linkage back-to-back assembled elastic sealing structure for aero-engine |
| CN112145471A (en) * | 2020-10-22 | 2020-12-29 | 航天科工火箭技术有限公司 | Gas disengaging type combined dynamic sealing device |
| CN112145471B (en) * | 2020-10-22 | 2022-05-17 | 航天科工火箭技术有限公司 | Gas disengaging type combined dynamic sealing device |
| CN113294376A (en) * | 2021-06-29 | 2021-08-24 | 哈尔滨工业大学 | Balance seal for nuclear main pump and manufacturing method thereof |
| CN113958535A (en) * | 2021-09-02 | 2022-01-21 | 西安航天动力研究所 | Impeller pressure drop type disengaging sealing device for liquid rocket engine |
| CN113958535B (en) * | 2021-09-02 | 2023-06-27 | 西安航天动力研究所 | Impeller pressure drop type disengaging sealing device for liquid rocket engine |
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