CN105114353B - A kind of oxyhydrogen engine turbine pump Rayleigh slot type floating ring seal arrangement - Google Patents
A kind of oxyhydrogen engine turbine pump Rayleigh slot type floating ring seal arrangement Download PDFInfo
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- CN105114353B CN105114353B CN201510520137.4A CN201510520137A CN105114353B CN 105114353 B CN105114353 B CN 105114353B CN 201510520137 A CN201510520137 A CN 201510520137A CN 105114353 B CN105114353 B CN 105114353B
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Abstract
The present invention provides a kind of oxyhydrogen engine turbine pump Rayleigh slot type floating ring seal arrangement, and it includes floating ring, and floating ring is arranged on seal casinghousing with the cavity of cover plate formation, wavy spring is set between floating ring and cover plate；Sealing axle sleeve sequentially passes through the centre bore of cover plate, floating ring and seal casinghousing；Described floating ring is assemblied by overall graphite annulus with floating ring seat hot pressing, and wherein graphite annulus is embedded in floating ring seat, and floating ring seat outer surface is symmetrical arranged two anti-rotation boss；Several Rayleigh grooves are set in floating ring bore area, increase several circumferential slots between floating ring endoporus outlet section and Rayleigh groove；Axial groove is uniformly arranged in floating ring endoporus circumferencial direction, makes itself and Rayleigh groove and circumferential slot insertion.The present invention introduces Rayleigh dynamic pressure slot structure in float ring seal, makes full use of the dynamic pressure effect of seal clearance fluid, further improves seal operation performance.
Description
Technical field
The present invention relates to sealing device, and in particular to a kind of hydrogen-oxygen rocket hydrogen-oxygen turbine pump dynamic sealing device.
Background technology
Since 21 century, each spacefaring nation in the world proposes manned Mars and survey of deep space plan, high thrust fire one after another
Arrow is essential means of transport, further reduce cost and pollution, improve reliability and carrying capacity be carrier rocket not
The developing direction come.Oxyhydrogen engine has the advantages 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.
Hydrogen-oxygen turbine pump is one of core component of hydrogen-oxygen rocket, and dynamic sealing is crucial zero group of turbine pump
Part.With the raising of motor power, turbine revolution speed, diameter of axle increase cause the lip of contact seal to be easy to be smoothed.
High thrust motor hydrogen-oxygen turbine pump dynamic sealing mainly use contactless dynamic sealing, such as labyrinth seal, float ring seal, and
Floating ring dynamic sealing is mainly ring of light cellular type float ring seal.
Smooth cellular type floating ring floated power is smaller, inclined during work especially in the less liquid hydrogen environment of sealing medium viscosity
Heart rate is larger, causes floating ring wear extent larger.To reduce the wear extent of floating ring, the reuse number of times of dynamic sealing is improved,
Smooth cellular type floating ring and the fit clearance of rotating shaft are larger, directly result in floating ring leakage rate substantially bigger than normal；Meanwhile, smooth cellular type
Floating ring and resistance coefficient in the gap on rotating shaft surface are smaller, further increase the leakage rate of floating ring.
Therefore, to prevent or reducing as far as possible the leakage rate of propellant, improve the turbine efficiency of pump and prevent liquid oxygen and hydrogen-rich
Combustion gas mixing, to ensure that turbine pump is safe and reliable.In consideration of it, having invented a kind of oxyhydrogen engine turbine pump Rayleigh slot type
Floating ring dynamic sealing device.
The content of the invention
The present invention proposes to overcome the big shortcoming of the smooth cellular type float ring seal leakage rate of existing oxyhydrogen engine turbine pump
A kind of oxyhydrogen engine turbine pump Rayleigh slot type floating ring seal arrangement, can meet high thrust oxyhydrogen engine turbine pump
Performance and the requirement of safe and reliable property.
Realize the technical scheme of the object of the invention：A kind of oxyhydrogen engine turbine pump is filled with Rayleigh slot type float ring seal
Put, it includes floating ring, floating ring is arranged on seal casinghousing with the cavity of cover plate formation, being set between floating ring and cover plate
Wavy spring；Sealing axle sleeve sequentially passes through the centre bore of cover plate, floating ring and seal casinghousing；Described floating ring is by overall graphite
Ring is assemblied with floating ring seat hot pressing, and wherein graphite annulus is embedded in floating ring seat, and floating ring seat outer surface is symmetrical arranged two
Individual anti-rotation boss；Several Rayleigh grooves are set in floating ring bore area, increased between floating ring endoporus outlet section and Rayleigh groove
Plus several circumferential slots；Axial groove is uniformly arranged in floating ring endoporus circumferencial direction, makes itself and Rayleigh groove and circumferential slot insertion；Institute
The seal casinghousing stated is symmetrical arranged anti-rotation groove, coordinates the anti-rotation boss of itself and floating ring.
A kind of oxyhydrogen engine turbine pump Rayleigh slot type floating ring seal arrangement as described above, the waveform bullet described in it
Spring applies axial pre-load to the back side of floating ring, makes itself and seal casinghousing formation axial seal, the unit perimeter side of wavy spring
To pretightning force be 0.06~0.15N/mm.
A kind of oxyhydrogen engine turbine pump as described above is with Rayleigh slot type floating ring seal arrangement, the capsul described in it
Body is fixedly connected with cover plate by screw.
A kind of oxyhydrogen engine turbine pump as described above is with Rayleigh slot type floating ring seal arrangement, the graphite annulus described in it
For M203K graphite；Described floating ring seat is GH4169 metals.
A kind of oxyhydrogen engine turbine pump as described above is with Rayleigh slot type floating ring seal arrangement, the floating ring described in it
Outlet section uses smooth straight hole structure, and chooses 0.12mm~0.14mm radial seals gap.
A kind of oxyhydrogen engine turbine pump Rayleigh slot type floating ring seal arrangement as described above, its graphite annulus with it is close
Envelope casing mating face processing annular boss to reduce contact friction area, the annular boss sealing surface of strict guarantee seal casinghousing and
The end face squareness and flatness of the annular boss working face of floating ring, and ensure that cooperation surface roughness will using grinding technics
Ask.The end face squareness 0.01mm and flatness 0.006mm of the annular boss working face of described floating ring, and using grinding work
Skill ensures that working face roughness Ra 0.1 is required；The end face squareness 0.01mm of the annular boss sealing surface of described seal casinghousing
With flatness 0.006mm, and ensure that working face roughness Ra 0.1 is required using grinding technics.
A kind of oxyhydrogen engine turbine pump Rayleigh slot type floating ring seal arrangement as described above, it is in floating ring endoporus
Surface sets 8~12 Rayleigh grooves, increases by 1 circumferential slot between floating ring endoporus outlet section and Rayleigh groove；In floating ring
Hole circumferencial direction is uniformly arranged the axial groove equal with Rayleigh slot number amount.
Effect of the invention is that：Hydrogen-oxygen rocket hydrogen-oxygen turbine pump dynamic sealing device of the present invention, its
Rayleigh dynamic pressure slot structure is introduced in float ring seal, the dynamic pressure effect of seal clearance fluid is made full use of, sealing is further improved
Service behaviour.Advantage is the present invention compared with prior art：(1) Rayleigh slot type floating ring floated power is big, is swift in response, has
The superior performance that starts to work, eccentricity is small when floating ring works, and its wear extent is less than smooth cellular type floating ring, it is adaptable to big
Thrust oxyhydrogen engine turbine pump dynamic sealing；(2) Rayleigh slot type floating ring can have less outlet section radial seal gap,
Sealing medium leakage rate is small, solves the problem of smooth cellular type float ring seal leakage rate is big, improves the turbine efficiency of pump.
Brief description of the drawings
Fig. 1 is a kind of oxyhydrogen engine turbine pump Rayleigh slot type floating ring seal arrangement structural representation of the present invention
Figure；
Fig. 2 is Rayleigh slot type floating ring；
Fig. 3 is Fig. 2 view I (annular boss of floating ring) partial enlarged drawing；
Fig. 4 is seal casinghousing；
Fig. 5 is Fig. 4 view II (annular boss of seal casinghousing) partial enlarged drawing；
In figure：1. floating ring；2. seal casinghousing；3. cover plate；4. wavy spring；5. sealing axle sleeve；6. screw；7. float
Ring seat；8. graphite annulus；9. axial groove；10. Rayleigh groove；11. circumferential slot；12. anti-rotation boss；14. anti-rotation groove；16. seal casinghousing
Annular boss sealing surface；17. the back side of floating ring；18. the annular boss working face of floating ring.
Embodiment
Below in conjunction with the accompanying drawings with specific embodiment to a kind of oxyhydrogen engine turbine pump Rayleigh slot type of the present invention
Floating ring seal arrangement is further described.
As shown in figure 1, a kind of oxyhydrogen engine turbine pump Rayleigh slot type floating ring seal arrangement of the present invention, it
Including floating ring 1, floating ring 1 is arranged on seal casinghousing 2 with the cavity of the formation of cover plate 3, being set between floating ring 1 and cover plate 3
Put wavy spring 4；Sealing axle sleeve 5 sequentially passes through the centre bore of cover plate 3, floating ring 1 and seal casinghousing 2.
As shown in Fig. 2 described floating ring 1 is assemblied by overall graphite annulus 8 with the hot pressing of floating ring seat 7, wherein graphite
Ring 8 is embedded in floating ring seat 7, and the outer surface of floating ring seat 7 is symmetrical arranged two anti-rotation boss 12.In the bore area of floating ring 1
8~12 Rayleigh grooves 10 are set (for example：8,10 or 12), increase between the endoporus outlet section of floating ring 1 and Rayleigh groove 10
Plus 1 circumferential slot 11；Be uniformly arranged the axial groove 9 equal with Rayleigh slot number amount in the endoporus circumferencial direction of floating ring 1, make its with it is auspicious
Sharp groove 10 and circumferential slot 11 insertion.
As shown in figure 4, described seal casinghousing 2 is symmetrical arranged anti-rotation groove 14, match somebody with somebody the anti-rotation boss 12 of itself and floating ring
Close.
Described wavy spring 4 applies axial pre-load to the back side 17 of floating ring, it is formed axial direction with seal casinghousing 2
Sealing, the pretightning force in the unit perimeter direction of wavy spring 4 for 0.06~0.15N/mm (for example：0.06N/mm, 0.10N/mm or
0.15N/mm)。
Described seal casinghousing 2 is fixedly connected with cover plate 3 by screw 6.
Described graphite annulus 8 is M203K graphite；Described floating ring seat 7 is GH4169 metals.
The described outlet section of floating ring 1 uses smooth straight hole structure, and chooses 0.12mm~0.14mm radial seals gap.
The radial seal of described floating ring 1 with sealing axle sleeve 5 is formed by the 0.12mm~0.14mm gaps formed between the two.
As shown in Figure 3 and Figure 5, process annular boss to reduce contact rubbing surface in graphite annulus 8 and the mating surface of seal casinghousing 2
Product, the end face squareness of the annular boss sealing surface 16 of strict guarantee seal casinghousing and the annular boss working face 18 of floating ring and
Flatness, and mating surface roughness requirements are ensured using grinding technics.The end of the annular boss working face 18 of described floating ring
Face perpendicularity 0.01mm and flatness 0.006mm, and ensure that working face roughness Ra 0.1 is required using grinding technics；Described
The end face squareness 0.01mm and flatness 0.006mm of the annular boss sealing surface 16 of seal casinghousing, and protected using grinding technics
Card working face roughness Ra 0.1 is required.
The present invention sets Rayleigh groove to increase floating ring floated power to reduce floating ring abrasion in floating ring bore area.
To ensure to there is sufficient medium to provide lubrication during floating ring work, it is to avoid wear and tear, floating ring endoporus outlet section and Rayleigh groove it
Between increase circumferential slot；Floating ring endoporus circumferencial direction is uniformly arranged axial groove, makes itself and Rayleigh groove and circumferential slot insertion, is circumferential
Groove provides sufficient lubricant medium, and provides identical boundary condition for each Rayleigh groove.Rayleigh dynamic pressure groove is in minimum sealing
Very big dynamic pressure can be produced during gap, after sealing inner surface is occupied by structures such as Rayleigh grooves in addition, floating ring is actual to be connect
Rubbing surface very little is touched, thus Rayleigh dynamic pressure groove float ring seal can form stable, greater stiffness stream in the gap of very little
Body film.
In turbine pump start-up period, although rotating speed is not high, but as medium is fed, the less side Rayleigh groove of radial clearance
Great dynamic pressure can be produced, it is rapid to promote floating ring to leave rotating shaft, it is to avoid rotating shaft is contacted with floating ring surface, thus Rayleigh is dynamic
Pressing groove type floating ring has the superior performance that starts to work.When axle rotates, Rayleigh groove produces swabbing action, makes close in gap
Seal medium and obtain energy, produce dynamic pressure effect there is provided the dynamic pressure of balance external resistance, improve floating ring job stability, keep away
Exempt from abrasion.
To improve the reliability of axial seal, the end face squareness of seal casinghousing sealing surface and floating ring working face need to be ensured
And flatness, and mating surface roughness requirements are ensured using grinding technics.To ensure to the greatest extent may be used while seal assembly axial seal
Floating ring can be reduced floats resistance, processes annular boss to reduce contact rubbing surface in graphite annulus and seal casinghousing mating surface
Product.To ensure that the normal of floating ring floats in the course of work, need to select suitable wavy spring pretightning force, unit perimeter direction
Pretightning force is 0.06~0.15N/mm.
To reduce leakage rate, as shown in Fig. 2 floating ring outlet section uses smooth straight hole structure, and less radial direction is chosen
Seal clearance.To prevent floating ring from rotating, floating ring seat seat outer surface two anti-rotation boss of symmetrical machining；Graphite annulus press-in is added
The floating ring seat of heat, carries out immersing in liquid nitrogen after assembling, eliminate thermal stress；Symmetrical anti-rotation is convex at seal casinghousing outer surface processing two
Platform, it is ensured that the end face squareness and flatness of sealing surface, and using the roughness requirements of grinding technics guarantee sealing surface.
Float ring seal component is installed.Floating ring anti-rotation boss is placed in the anti-rotation groove of seal casinghousing first, secondly pacified
Wavy spring is filled, cover plate is finally fixed on seal casinghousing with screw, its working face is formed axial direction with seal casinghousing sealing surface
Sealing, it is ensured that wavy spring compression height, makes it apply rational axial pre-load to floating ring, it is ensured that floating ring normally floats.
Claims (6)
1. a kind of oxyhydrogen engine turbine pump Rayleigh slot type floating ring seal arrangement, it is characterised in that：It includes floating ring
(1), floating ring (1) is arranged in the cavity that seal casinghousing (2) is formed with cover plate (3), between floating ring (1) and cover plate (3)
Wavy spring (4) is set；Sealing axle sleeve (5) sequentially passes through the centre bore of cover plate (3), floating ring (1) and seal casinghousing (2)；
Described floating ring (1) is assemblied by overall graphite annulus (8) with floating ring seat (7) hot pressing, and wherein graphite annulus (8) is inlayed
In floating ring seat (7), floating ring seat (7) outer surface is symmetrical arranged two anti-rotation boss (12)；In floating ring (1) bore area
Several Rayleigh grooves (10) are set, several circumferential slots are increased between floating ring (1) endoporus outlet section and Rayleigh groove (10)
(11)；In floating ring (1), endoporus circumferencial direction is uniformly arranged axial groove (9), it is passed through with Rayleigh groove (10) and circumferential slot (11)
It is logical；
Described seal casinghousing (2) is symmetrical arranged anti-rotation groove (14), coordinates the anti-rotation boss (12) of itself and floating ring；
Described wavy spring (4) applies axial pre-load to the back side (17) of floating ring, makes itself and seal casinghousing (2) formation axial direction
Sealing, the pretightning force in the unit perimeter direction of wavy spring (4) is 0.06~0.15N/mm；
Annular boss is processed in graphite annulus (8) and seal casinghousing (2) mating surface to reduce contact friction area, strict guarantee sealing
The end face squareness and flatness of the annular boss sealing surface (16) of housing and the annular boss working face (18) of floating ring, and adopt
Ensure mating surface roughness requirements with grinding technics.
2. a kind of oxyhydrogen engine turbine pump Rayleigh slot type floating ring seal arrangement according to claim 1, its feature
It is：Described seal casinghousing (2) is fixedly connected with cover plate (3) by screw (6).
3. a kind of oxyhydrogen engine turbine pump Rayleigh slot type floating ring seal arrangement according to claim 1, its feature
It is：Described graphite annulus (8) is M203K graphite；Described floating ring seat (7) is GH4169 metals.
4. a kind of oxyhydrogen engine turbine pump Rayleigh slot type floating ring seal arrangement according to claim 1, its feature
It is：Described floating ring (1) outlet section uses smooth straight hole structure, and chooses 0.12mm~0.14mm radial seals gap.
5. a kind of oxyhydrogen engine turbine pump Rayleigh slot type floating ring seal arrangement according to claim 1, its feature
It is：The end face squareness 0.01mm and flatness 0.006mm of the annular boss working face (18) of described floating ring, and use
Grinding technics ensures that working face roughness Ra 0.1 is required；The end face of the annular boss sealing surface (16) of described seal casinghousing hangs down
Straight degree 0.01mm and flatness 0.006mm, and ensure that working face roughness Ra 0.1 is required using grinding technics.
6. a kind of oxyhydrogen engine turbine pump Rayleigh slot type floating ring seal arrangement according to claim 1, its feature
It is：8~12 Rayleigh grooves (10) are set in floating ring (1) bore area, in floating ring (1) endoporus outlet section and Rayleigh groove
(10) 1 circumferential slot (11) is increased between；In floating ring (1), endoporus circumferencial direction is uniformly arranged the axle equal with Rayleigh slot number amount
To groove (9).
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| CN201510520137.4A CN105114353B (en) | 2015-08-21 | 2015-08-21 | A kind of oxyhydrogen engine turbine pump Rayleigh slot type floating ring seal arrangement |
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|---|---|---|---|
| CN201510520137.4A CN105114353B (en) | 2015-08-21 | 2015-08-21 | A kind of oxyhydrogen engine turbine pump Rayleigh slot type floating ring seal arrangement |
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| CN105114353A CN105114353A (en) | 2015-12-02 |
| CN105114353B true CN105114353B (en) | 2017-09-29 |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105971924A (en) * | 2016-05-31 | 2016-09-28 | 北京航天动力研究所 | Circumferential sectioned helium sealing device for oxygen turbine pump of hydrogen oxygen engine |
| CN107620654B (en) * | 2016-07-14 | 2024-05-17 | 北京航天动力研究所 | Coaxial jet mixer of hydrogen-oxygen expansion cycle rocket engine |
| CN106949190B (en) * | 2017-05-27 | 2023-03-31 | 中国工程物理研究院总体工程研究所 | Floating ring type damping sealing device |
| CN107355537B (en) * | 2017-08-28 | 2023-11-07 | 中密控股股份有限公司 | Carbon float sealing ring with fluid groove and sealing device thereof |
| CN110285219B (en) * | 2019-06-28 | 2021-01-19 | 中国航空工业集团公司北京长城计量测试技术研究所 | High-efficiency double zero-leakage floating ring sealing device |
| CN110821879B (en) * | 2019-09-30 | 2021-06-11 | 北京航天动力研究所 | Helium flame-retardant sealing structure of turbopump of liquid rocket engine |
| CN110671357B (en) * | 2019-10-09 | 2021-08-10 | 北京航天动力研究所 | Damping sealing device for high-power hydrogen-oxygen turbine pump |
| CN111350551B (en) * | 2020-03-07 | 2022-04-26 | 西北工业大学 | Be used for flexible cylinder air film seal structure between birotor axle |
| CN112628190B (en) * | 2020-12-18 | 2024-02-09 | 西安航天动力研究所 | Combined sealing device for turbopump of liquid rocket engine |
| CN117553001B (en) * | 2023-05-08 | 2024-03-26 | 蓝箭航天空间科技股份有限公司 | Reusable double-low-temperature liquid rocket engine turbopump structure |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH660407A5 (en) * | 1983-08-25 | 1987-04-15 | Alfred F Schirmer | SEALING RING FOR PISTON RODS. |
| JPS6223503A (en) * | 1985-07-22 | 1987-01-31 | Mitsubishi Heavy Ind Ltd | Shaft seal device of turbo machine |
| CN201771838U (en) * | 2010-07-08 | 2011-03-23 | 中国航天科技集团公司第六研究院第十一研究所 | Sealing structure of turbine pump |
| CN202402644U (en) * | 2011-12-31 | 2012-08-29 | 中国燃气涡轮研究院 | Floating ring sealing device |
| CN205001248U (en) * | 2015-08-21 | 2016-01-27 | 北京航天动力研究所 | Oxyhydrogen turbine of engine is unsteady ring sealing device of rayleigh slot type for pump |
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