CN108194406A - It is a kind of can the late release moment mechanically-sealing apparatus - Google Patents
It is a kind of can the late release moment mechanically-sealing apparatus Download PDFInfo
- Publication number
- CN108194406A CN108194406A CN201711466481.5A CN201711466481A CN108194406A CN 108194406 A CN108194406 A CN 108194406A CN 201711466481 A CN201711466481 A CN 201711466481A CN 108194406 A CN108194406 A CN 108194406A
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- China
- Prior art keywords
- sealing
- ring
- shaft
- face
- hole
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- 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
- F04D29/10—Shaft sealings
- F04D29/106—Shaft 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
- F02K9/48—Feeding propellants using pumps driven by a gas turbine fed by propellant combustion gases or fed by vaporized propellants or other gases
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Sealing (AREA)
Abstract
The present invention relates to fluid seal apparatus technical fields, suitable for liquid-propellant rocket engine turbine pump, for cryogenic propellant and high-temperature fuel gas to be isolated, disclose it is a kind of can the late release moment mechanically-sealing apparatus, including shaft, stationary ring, rotating ring and spring housing, the rotating ring, stationary ring is mounted in shaft, spring housing is sleeved on the outside of stationary ring, one sealing ring is installed respectively in the both sides of stationary ring, the seal face of one of sealing ring contacts to form sealing with spring housing when disengaging, the seal face of another sealing ring contacts to form sealing with rotating ring when being closed.Mechanically-sealing apparatus sealing of the present invention, which disengages, stablizes, and seal closure moment buffer delay reduces the closure fretting wear time of seal face, alleviates the degree of wear, improves the reusable performance of the mechanically-sealing apparatus.
Description
Technical field
The present invention relates to fluid seal apparatus technical fields, low for being isolated suitable for liquid-propellant rocket engine turbine pump
Warm propellant and high-temperature fuel gas, and in particular to it is a kind of can the late release moment mechanically-sealing apparatus.
Background technology
Important component of the turbine pump as liquid-propellant rocket engine, effect are to needed for engine work offer
Propellant.Afterburning recycles liquid oxygen kerosene engine turbine pump generally use disengagement type mechanical seal isolation from oxygen chamber low-temperature liquid oxygen and whirlpool
Chamber high-temperature fuel gas is taken turns, main working process is：When engine is pre-chilled, seal face keeps fitting, realizes to pump chamber liquid oxygen
Sealing；Under pressure medium effect, seal face disengages seal face, becomes non-contact shape from contact condition after engine start
State；Under spring force, seal face is closed seal face after engine cutoff, is become contacting shape from contactless state
State.Disengagement type mechanical seal in engine start and shut-down-phase inevitably there are fretting wear, in engine start rank
Section seal face disengagement is rapider, and fretting wear degree is lighter, more late in engine cutoff stage seal face closing time, rubs
It is lighter to wipe the degree of wear.
But since cryogenic media in seal face easily expands gasification, in higher operating pressure and larger vibration environment
Under, disengagement type mechanical seal is extremely serious in engine cutoff phase wear, it will usually sealing leak amount be caused to uprush, influence to send out
The reusability of motivation.
Invention content
It is an object of the invention to postpone the close moment of disengagement type mechanical seal after engine cutoff, mitigate seal face
Fretting wear, and provide it is a kind of can the late release moment mechanically-sealing apparatus.
In order to complete above-mentioned purpose, technical solution proposed by the invention is：
It is a kind of can the late release moment mechanically-sealing apparatus, including shaft, stationary ring, rotating ring and spring housing, described turn
Axis is divided into the first active section and the second active section, and the diameter of the first active section is less than the diameter of the second active section, the first active section
And second form the shaft shoulder between active section, is characterized in that：
One small one two big holes are coaxially provided in the spring housing, respectively close to the first hole of the shaft shoulder and far from axis
Second hole of shoulder, holes are interconnected to form a radially distributed step surface；The stationary ring includes cylinder and is located at cylinder
The flange of one end, cylinder stretch into the first hole the inner face that primary sealing area, cylinder and the first hole are cooperatively formed with the inner face in the hole
Between be equipped with the first auxiliary seal；Flange stretches into the second hole and forms a free gap, the free gap with the step surface
Interior to be equipped with spring, one end of spring and flange contact, the other end is contacted with the step surface, and shaft stretches out two respectively through holes
The both ends in a hole；The both sides of the flange are respectively provided with a sealing ring, respectively close to the first sealing ring of the shaft shoulder and far from axis
Second sealing ring of shoulder, first sealing ring and the second sealing ring are equipped with the ring-shaped step outwardly protruded, wherein being located at
Ring-shaped step end face on one sealing ring is secondary sealing area, and the ring-shaped step end face being located on the second sealing ring is sealed for third
Face；The distance in the interior outside of the third sealing surface and axle center is respectively the distance of d2 and d1, the interior outside of secondary sealing area and axle center
The distance in respectively d5 and d4, primary sealing area and axle center is d3, and the magnitude relationship of each distance meets：d1>d2>d3>d4>d5；
The rotating ring is contiguously mounted on the first active section of shaft and forms the 4th sealing surface with shaft, and the rotating ring is with turning
Between centers is equipped with the second auxiliary seal.
Further, the first cavity volume end face circle distribution of the spring housing has multiple mounting holes, the stationary ring flange
Annular groove corresponding with mounting hole is equipped with, one end of spring is contacted with the bottom surface of mounting hole, the bottom surface of the other end and annular groove
Contact.
Further, in order to ensure sealing effect, the rotating ring and facial plane degree≤0.6 μm of secondary sealing area face,
Roughness≤0.1 μm.
Further, for the purposes of guarantee sealing effect, the spring housing and the facial plane degree of third sealing surface face
≤ 0.6 μm, roughness≤0.1 μm.
Further, the distance between the third sealing surface and step surface are 2-3mm.
Further, first auxiliary seal and the second auxiliary seal are metallic packing ring.
Compared with prior art, the advantage of the invention is that：
The present invention has effectively delayed disengagement type mechanical seal after engine cutoff in the case where sealed operating pressure is identical
Close moment, reduce the fraction time of seal face, alleviate the degree of wear, reduce the leakage rate after work, improve
Reusable performance.
Description of the drawings
Fig. 1 is the structure diagram of disengagement type mechanically-sealing apparatus of the embodiment of the present invention；
Fig. 2 is the structure diagram of spring mounting hole of the embodiment of the present invention.
In figure：1- shafts, 2- stationary rings, 3- rotating rings, 4- spring housings, the first auxiliary seals of 5-, 6- springs, 7- first are sealed
Ring, the second sealing rings of 8-, the second auxiliary seals of 9-, the first active sections of 11-, the second active sections of 12-, 21- cylinders, 22- flanges,
23- primary sealing areas, 24- annular grooves, the 4th sealing surfaces of 31-, the first holes of 41-, the second holes of 42-, 43- step surfaces, 44- installations
Hole, 71- secondary sealing areas, 81- third sealing surfaces.
Specific embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail：
It is a kind of can the late release moment mechanically-sealing apparatus, including shaft 1, stationary ring 2, rotating ring 3 and spring housing 4, institute
It states shaft 1 to divide for the first active section 11 and the second active section 12, the diameter of the first active section 11 is less than the straight of the second active section 12
Diameter forms the shaft shoulder between the first active section 11 and the second active section 12,
One small one two big holes are coaxially provided in the spring housing, respectively close to the first hole 41 of the shaft shoulder and separate
Second hole 42 of the shaft shoulder, holes are interconnected to form a radially distributed step surface 43；The stationary ring 2 includes 21 He of cylinder
The flange 22 of 21 one end of cylinder is located at, cylinder 21 stretches into the first hole 41 and cooperatively forms primary sealing area 23 with the inner face in the hole,
The first auxiliary seal 5 is equipped between the inner face in 21 and first hole 23 of cylinder；Flange 22 stretches into the second hole 42 and the step surface 43
Form a free gap.Spring 6 is equipped in free gap, is distributed with to 43 even circumferential of step surface of the spring housing 4
Multiple mounting holes 44, the flange 22 are equipped with and 44 corresponding annular groove 24 of mounting hole, one end and the mounting hole 44 of spring 6
Bottom surface contacts, and the other end is contacted with the bottom surface of annular groove 22, and shaft 1 stretches out the both ends in two holes through holes respectively；
22 both sides of flange are respectively equipped with an annular mounting groove, and a sealing ring is installed in each annular mounting groove,
Second sealing ring 8 of two sealing rings respectively close to the first sealing ring 7 of the shaft shoulder and far from the shaft shoulder, first sealing ring 7
The ring-shaped step outwardly protruded is equipped with the second sealing ring 8, wherein the ring-shaped step end face being located on the first sealing ring 7 is the
Two sealing surfaces 71, the ring-shaped step end face being located on the second sealing ring 8 are third sealing surface 81, the third sealing surface 81 and platform
The distance between terrace 43 is 2-3mm.The rotating ring 3 and
Facial plane degree≤0.6 μm of two sealing surfaces, 71 face, roughness≤0.1 μm, the spring housing 4 are sealed with third
Facial plane degree≤0.6 μm of 81 face of face, roughness≤0.1 μm.The distance point in outside and axle center in the third sealing surface 81
Not Wei d2 and d1, the distance in outside and axle center is respectively d5 and d4 in secondary sealing area 71, primary sealing area 23 and axle center away from
Meet from the magnitude relationship for d3, each distance：d1>d2>d3>d4>d5；
The rotating ring 3 is contiguously mounted on 1 first active section 11 of shaft and forms the 4th sealing surface 31 with shaft 1, described
The second auxiliary seal 9 is equipped between rotating ring 3 and shaft 1.
The present invention operation principle be：During the pre- cold filling of engine, it is close that secondary sealing area 71 and the contact of rotating ring 3 form master
Envelope realizes the sealing of pump chamber cryogenic media；After engine start, pump chamber pressure P1Gradually increase, with pressure difference (P before and after sealing1-
P2) gradual increase, stationary ring 2 moves axially, and the first sealing ring 7 is made mutually to be disengaged with rotating ring 3, pump chamber high-pressure medium flows to turbine
Chamber realizes the isolation of propellant and combustion gas；After engine cutoff, pressure P before sealing1It is gradually reduced, secondary sealing area 71 and dynamic
Ring 3 contacts again, realizes reusable.
After mechanical seal disengages, the ring-shaped step end face of 8 evagination of the second sealing ring is contacted with spring housing 4, forms third
Sealing surface 81.Since the second sealing ring 8 and spring housing 4 form new sealing surface, pressure difference (P before and after sealing1-P2) acting surface
Product is by d before3And d4Between annulus area, increase as d1And d4Between annulus area.Since medium disengages pressure application surface
Long-pending increase, so pressure P before sealing1Under the premise of certain, sealing disengages more stable.It seals and closes after similary engine cutoff
Also phase delay at the time of conjunction, reduces the closure fretting wear time of seal face, alleviates the degree of wear, improving can weigh
Multiple performance.
Claims (6)
1. it is a kind of can the late release moment mechanically-sealing apparatus, including shaft (1), stationary ring (2), rotating ring (3) and spring housing
(4), the shaft (1) is divided into the first active section (11) and the second active section (12), and the diameter of the first active section (11) is less than the
The diameter of two active sections (12) forms the shaft shoulder between the first active section (11) and the second active section (12), it is characterised in that：It is described
One small one two big holes are coaxially provided in spring housing (4), respectively close to the first hole (41) of the shaft shoulder and far from the shaft shoulder
Second hole (42), holes are interconnected to form a radially distributed step surface (43)；The stationary ring (2) includes cylinder (21)
With the flange (22) for being located at cylinder (21) one end, cylinder (21) stretches into the first hole (41) and cooperatively forms first with the inner face in the hole
Sealing surface (23) is equipped with the first auxiliary seal (5) between the inner face of cylinder (21) and the first hole (41)；Flange (22) stretches into the second hole
(42) free gap is formed with the step surface (43) in, equipped with spring (6) in the free gap, the one of spring (6)
End is contacted with flange (22), and the other end is contacted with the step surface (43), and shaft (1) stretches out the two of two holes through holes respectively
End；The both sides of the flange (22) are respectively provided with a sealing ring, respectively close to the first sealing ring (7) of the shaft shoulder and far from the shaft shoulder
The second sealing ring (8), first sealing ring (7) and the second sealing ring (8) be equipped with the ring-shaped step outwardly protruded, wherein
Ring-shaped step end face on the first sealing ring (7) is located at as secondary sealing area (71), the annular table being located on the second sealing ring (8)
Rank end face is third sealing surface (81)；The distance in outside and axle center is respectively d2 and d1 in the third sealing surface (81), and second
The distance in outside and axle center is respectively d5 and d4 in sealing surface (71), and the distance in primary sealing area (23) and axle center is d3, respectively away from
From magnitude relationship meet：d1>d2>d3>d4>d5；
The rotating ring (3), which is contiguously mounted on the first active section of shaft, forms the 4th sealing surface (31) with shaft (1), described dynamic
The second auxiliary seal (9) is equipped between ring (3) and shaft (1).
2. it is according to claim 1 can the late release moment mechanically-sealing apparatus, it is characterised in that：The spring housing
(4) multiple mounting holes (44) are distributed with to step surface (43) even circumferential, the flange (22) is equipped with and mounting hole (44)
Corresponding annular groove (24), one end of spring (6) are contacted with the bottom surface of mounting hole (44), the bottom surface of the other end and annular groove (24)
Contact.
3. it is according to claim 1 or 2 can the late release moment mechanically-sealing apparatus, it is characterised in that：The rotating ring
(3) with facial plane degree≤0.6 μm of secondary sealing area (71) face, roughness≤0.1 μm.
4. it is according to claim 3 can the late release moment mechanically-sealing apparatus, it is characterised in that：The spring housing
(4) with facial plane degree≤0.6 μm of third sealing surface (81) face, roughness≤0.1 μm.
5. it is according to claim 4 can the late release moment mechanically-sealing apparatus, it is characterised in that：The third sealing
The distance between face (81) and step surface (43) are 2-3mm.
6. it is according to claim 5 can the late release moment mechanically-sealing apparatus, it is characterised in that：First auxiliary
It is metallic packing ring to seal (5) and the second auxiliary seal (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711466481.5A CN108194406B (en) | 2017-12-28 | 2017-12-28 | It is a kind of can the late release moment mechanically-sealing apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711466481.5A CN108194406B (en) | 2017-12-28 | 2017-12-28 | It is a kind of can the late release moment mechanically-sealing apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108194406A true CN108194406A (en) | 2018-06-22 |
| CN108194406B CN108194406B (en) | 2019-07-16 |
Family
ID=62585793
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711466481.5A Active CN108194406B (en) | 2017-12-28 | 2017-12-28 | It is a kind of can the late release moment mechanically-sealing apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108194406B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109162955A (en) * | 2018-08-28 | 2019-01-08 | 北京航天动力研究所 | Combine automatic disengaging dynamic sealing device in a kind of engine turbine pumps labyrinth |
| CN110821712A (en) * | 2019-10-23 | 2020-02-21 | 西安航天动力研究所 | Low temperature turbine pump high temperature gas outlet end connection structure |
| CN111636981A (en) * | 2020-06-12 | 2020-09-08 | 哈尔滨工业大学 | Test bench for testing floating ring seal of rocket turbopump |
| CN112576757A (en) * | 2020-12-11 | 2021-03-30 | 西安航天动力研究所 | Metal sealing structure for non-contact end face sealing |
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| CN103486076A (en) * | 2013-09-19 | 2014-01-01 | 丹东克隆集团有限责任公司 | Nuclear power charging pump mechanical seal device |
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| CN105317732A (en) * | 2015-10-19 | 2016-02-10 | 陕西科技大学 | Sealing device of ammonia feeding device |
| US20160090991A1 (en) * | 2014-09-29 | 2016-03-31 | New Way Machine Components, Inc. | Thrust bearing as a seal |
| CN105545795A (en) * | 2016-01-05 | 2016-05-04 | 安徽绿源泵阀制造有限公司 | Novel water cooling acid-resistant, alkali-resistant and high-temperature-resistant packaged type mechanical seal |
| CN107355415A (en) * | 2017-07-28 | 2017-11-17 | 丹东克隆集团有限责任公司 | Nuclear power condensate pump mechanically-sealing apparatus |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109162955A (en) * | 2018-08-28 | 2019-01-08 | 北京航天动力研究所 | Combine automatic disengaging dynamic sealing device in a kind of engine turbine pumps labyrinth |
| CN109162955B (en) * | 2018-08-28 | 2021-03-26 | 北京航天动力研究所 | End surface labyrinth combined automatic disengaging type dynamic sealing device for engine turbo pump |
| CN110821712A (en) * | 2019-10-23 | 2020-02-21 | 西安航天动力研究所 | Low temperature turbine pump high temperature gas outlet end connection structure |
| CN111636981A (en) * | 2020-06-12 | 2020-09-08 | 哈尔滨工业大学 | Test bench for testing floating ring seal of rocket turbopump |
| CN112576757A (en) * | 2020-12-11 | 2021-03-30 | 西安航天动力研究所 | Metal sealing structure for non-contact end face sealing |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108194406B (en) | 2019-07-16 |
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