CN108708771A - A kind of high-molecular organic material dynamic sealing device for cryogenic turbo - Google Patents
A kind of high-molecular organic material dynamic sealing device for cryogenic turbo Download PDFInfo
- Publication number
- CN108708771A CN108708771A CN201810398235.9A CN201810398235A CN108708771A CN 108708771 A CN108708771 A CN 108708771A CN 201810398235 A CN201810398235 A CN 201810398235A CN 108708771 A CN108708771 A CN 108708771A
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- CN
- China
- Prior art keywords
- sealing device
- dynamic sealing
- organic material
- molecular organic
- turbine
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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
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/08—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
The invention discloses a kind of high-molecular organic material dynamic sealing device for cryogenic turbo, which is the cyclic structure with flange, is sleeved on the outside of turbine rotor, and flange is fixed by screws on turbine shroud；Cyclic structure outer wall in addition to flange is assembly mating surface, with turbine shroud clearance fit；It is machined with labyrinth seal tooth at the dynamic sealing device inner wall opposite with turbine rotor outer rim.Dynamic sealing device material is high-molecular organic material polyimides.The configuration of the present invention is simple, easy processing, light-weight, stability is high, is suitable for cryogenic turbo, and the lower turbine disk that can bear and run at high speed effectively reduces flow loss theres is a situation where touch mill, and sealing effect is good, with high reliability and safety.
Description
Technical field
The present invention relates to a kind of high-molecular organic material dynamic sealing devices for cryogenic turbo, belong to liquid rocket and start
Machine turbine mechanical seal for pump application field.
Background technology
Since the 21th century, each spacefaring nation in the world readjusts space flight development strategy or development plan, manned space flight
It is taken seriously again with survey of deep space activity, is proposed respective new generation's carrier rocket, hydrogen-oxygen expansion cycles rocket hair one after another
Motivation because its simple system, reliability is high, performance is high, it is adaptable, can repeatedly start the advantages that due in New Generation of Overseas delivery
Rocket Upper Stage is widely used.
Oxyhydrogen engine turbine pump is the key component for conveying liquid hydrogen liquid oxygen propellant, and wherein the operating status of turbine is good
The bad Performance And Reliability that will directly affect engine.And the radial clearance between turbine rotor and shell has turbine efficiency
Directly influence, turbine dynamic sealing can help to control reduction radial clearance, reduce amount of leakage of the working medium in radial clearance, with
Improve the working efficiency of turbine.
The turbine of hydrogen-oxygen expansion cycles rocket engine operates mainly in gas hydrogen medium at present, operating temperature zero degree with
Under, turbine shroud majority uses the titanium alloy material of low temperature performance excellent.And the more common dynamic sealing of turbine is honeycomb seal,
This dynamic sealing has problems in that, mostly uses high-temperature alloy material, can not directly weld, need to add with titanium alloy shell
One high temperature alloy structural member is exclusively used in welding with honeycomb seal, then the modes such as is bolted and is fixed on shell, not only
The complexity of structure is increased, the weight of shell has also been aggravated；On the other hand, it is limited by material technology development, titanium closes at present
The difficulty of golden material processing small size core lattice honeycomb seal is larger, and titanium alloy honeycomb once touches mill, local temperature mistake
It is high that spontaneous combustion easily occurs, influence the safety in utilization of dynamic sealing.
Invention content
The technology of the present invention solves the problems, such as：It overcomes the deficiencies of the prior art and provide a kind of for the organic of cryogenic turbo
High molecular material dynamic sealing device, it is simple in structure, it is light-weight, mill can be touched, it is safe.
Technical solution of the invention is：A kind of high-molecular organic material dynamic sealing device for cryogenic turbo, institute
It is the cyclic structure with flange to state dynamic sealing device, is sleeved on the outside of turbine rotor, and the flange is fixed by screws in whirlpool
It takes turns on shell；Cyclic structure outer wall in addition to flange is assembly mating surface, with turbine shroud clearance fit；Dynamic sealing device with
It is machined with labyrinth seal tooth at the opposite inner wall of turbine rotor outer rim.
The dynamic sealing device material is high-molecular organic material polyimides mould feed powder.
The labyrinth seal tooth is rectangular configuration.
The labyrinth seal tooth tooth depth, the facewidth and tooth pitch meet tooth depth：The facewidth：Tooth pitch is 1.5：1：1.
Unilateral radial clearance between the dynamic sealing device and turbine rotor is 0.3-0.5mm.
Compared with prior art, the present invention has the advantages that：
(1) dynamic sealing device of the present invention is process using high-molecular organic material polyimides, low temperature resistant environment, stabilization
Property it is high, mechanical performance is high, safe and reliable under the cryogenic high pressure gas hydrogen medium of expander cycle rocket engine.
(2) polyimides is self-extinguishing polymer, and smoke rate is low, when dynamic sealing device of the present invention and high-speed rotating turbine
It when disk touches mill, is not easy to catch fire, advantageously ensures that the stability of working environment.
(3) dynamic sealing device is connect with turbine shroud using screw, is solved during different materials can not weld and need to add
Between structural member the problem of, when avoiding welding the problem of material compatibility, simplify shell structure and processing technology, and gather
Acid imide density is greatly reduced compared with metal material, can further mitigate the overall weight of turbine.
(4) labyrinth seal tooth is set as rectangular configuration, simple in structure, by being machined easy to implement, tooth depth：The facewidth：
Tooth pitch is 1.5：1：1, ensure that air-flow is more also easy to produce vortex, separation in rectangle right-angle structure, is less useful for Working fluid flow, to
Reach reduction flow loss, improves the purpose of turbine efficiency.
Description of the drawings
Fig. 1 is structure of the invention figure；
Fig. 2 is dynamic sealing device of the present invention using installation diagram；
Fig. 3 is labyrinth seal tooth Local map.
Specific implementation mode
To overcome the shortcomings of that turbine dynamic sealing in existing hydrogen-oxygen expander cycle rocket engine low temperature environment, the present invention propose one
Kind of turbine dynamic sealing device, for the device using new material, new construction, processing is simple, at the same allow with run at high speed under turbine
Disk touches mill, and functional reliability is high at low ambient temperatures.
Dynamic sealing device of the present invention is by high-molecular organic material polyimides mould feed powder compression molding, then passes through mechanical processing
Reach final structure and size.As shown in Figure 1, the device is the cyclic monomer structure with flange, it is sleeved on outside turbine rotor
Side, is machined with hole on flange 1, and corresponding on turbine shroud to be threaded hole, screw passes through the through-hole and turbine shroud phase of flange
Even.Cyclic structure outer wall of the device in addition to flange is assembly mating surface 2, is gap-matched with turbine shroud inner wall；Dress
The position of dynamic sealing device is auxiliarily fixed with mating surface, there are certain gaps with turbine shroud for assembly mating surface, ensure different
Temperature lower sealing device has flexible space, assembly relation such as Fig. 2 institutes of dynamic sealing device and turbine rotor and turbine shroud
Show.It is machined with labyrinth seal tooth 3 at the dynamic sealing device inner wall opposite with turbine rotor outer rim, flow-disturbing is carried out to leakage working medium,
The gas flowing in radial clearance is hindered, leakage rate is reduced.Labyrinth seal odontoid is rectangle, and sealing space of teeth is uniform, such as Fig. 3
It is shown.
3 tooth depth of labyrinth seal tooth of the present invention：The facewidth：Tooth pitch is 1.5：1：1.In order to improve turbine efficiency, dynamic sealing device
Unilateral radial clearance between turbine rotor is 0.3-0.5mm.
It is 6, tooth depth 1.5mm that the sealing number of teeth, which is arranged, in the present invention, and the facewidth is 1mm with tooth pitch, and flange height is 5mm, is removed
Cyclic structure thickness outside flange is 10mm.
Apparatus of the present invention can be operated under -100 DEG C~0 DEG C of low temperature environment, simple in structure, easy processing, light-weight, surely
Qualitative height, the lower turbine disk that can bear and run at high speed can effectively reduce flow loss, sealing effect there is a situation where touching mill
It is good, there is high reliability and safety.
Unspecified part of the present invention belongs to technology well known to those skilled in the art.
Claims (5)
1. a kind of high-molecular organic material dynamic sealing device for cryogenic turbo, it is characterised in that：The dynamic sealing device is
Cyclic structure with flange (1), is sleeved on the outside of turbine rotor, and the flange (1) is fixed by screws on turbine shroud；
Cyclic structure outer wall in addition to flange is assembly mating surface (2), with turbine shroud clearance fit；Dynamic sealing device turns with turbine
Labyrinth seal tooth (3) is machined at the opposite inner wall of sub- outer rim.
2. a kind of high-molecular organic material dynamic sealing device for cryogenic turbo according to claim 1, feature exist
In：The dynamic sealing device material is high-molecular organic material polyimides mould feed powder.
3. a kind of high-molecular organic material dynamic sealing device for cryogenic turbo according to claim 2, feature exist
In：The labyrinth seal tooth (3) is rectangular configuration.
4. a kind of high-molecular organic material dynamic sealing device for cryogenic turbo according to claim 3, feature exist
In：Labyrinth seal tooth (3) tooth depth, the facewidth and tooth pitch meet tooth depth：The facewidth：Tooth pitch is 1.5：1：1.
5. a kind of high-molecular organic material dynamic sealing device for cryogenic turbo according to claim 1, feature exist
In：Unilateral radial clearance between the dynamic sealing device and turbine rotor is 0.3-0.5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810398235.9A CN108708771A (en) | 2018-04-28 | 2018-04-28 | A kind of high-molecular organic material dynamic sealing device for cryogenic turbo |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810398235.9A CN108708771A (en) | 2018-04-28 | 2018-04-28 | A kind of high-molecular organic material dynamic sealing device for cryogenic turbo |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108708771A true CN108708771A (en) | 2018-10-26 |
Family
ID=63868653
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810398235.9A Pending CN108708771A (en) | 2018-04-28 | 2018-04-28 | A kind of high-molecular organic material dynamic sealing device for cryogenic turbo |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108708771A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB767656A (en) * | 1953-11-12 | 1957-02-06 | Rolls Royce | Improvements in or relating to axial-flow fluid machines such as turbines and compressors |
| US5501573A (en) * | 1993-01-29 | 1996-03-26 | Steam Specialties, Inc. | Segmented seal assembly and method for retrofitting the same to turbines and the like |
| CN101220757A (en) * | 2007-01-09 | 2008-07-16 | 株式会社东芝 | Steam turbine |
| CN104912604B (en) * | 2015-06-01 | 2016-08-24 | 西安交通大学 | A kind of have the spin-ended anti-rotating plate structure pressing down and bestirring oneself |
-
2018
- 2018-04-28 CN CN201810398235.9A patent/CN108708771A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB767656A (en) * | 1953-11-12 | 1957-02-06 | Rolls Royce | Improvements in or relating to axial-flow fluid machines such as turbines and compressors |
| US5501573A (en) * | 1993-01-29 | 1996-03-26 | Steam Specialties, Inc. | Segmented seal assembly and method for retrofitting the same to turbines and the like |
| CN101220757A (en) * | 2007-01-09 | 2008-07-16 | 株式会社东芝 | Steam turbine |
| CN104912604B (en) * | 2015-06-01 | 2016-08-24 | 西安交通大学 | A kind of have the spin-ended anti-rotating plate structure pressing down and bestirring oneself |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20181026 |
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| RJ01 | Rejection of invention patent application after publication |