CN105318011B - Low-leakage-rate F type staggered tooth labyrinth seal capable of adapting to vibration of rotor - Google Patents
Low-leakage-rate F type staggered tooth labyrinth seal capable of adapting to vibration of rotor Download PDFInfo
- Publication number
- CN105318011B CN105318011B CN201510882438.1A CN201510882438A CN105318011B CN 105318011 B CN105318011 B CN 105318011B CN 201510882438 A CN201510882438 A CN 201510882438A CN 105318011 B CN105318011 B CN 105318011B
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- China
- Prior art keywords
- tooth
- sealing
- rotor
- ring gear
- types
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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.)
- Expired - Fee Related
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- 238000007789 sealing Methods 0.000 claims abstract description 161
- 238000009434 installation Methods 0.000 claims abstract description 15
- 230000010355 oscillation Effects 0.000 claims description 35
- 230000004323 axial length Effects 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 18
- 210000000515 tooth Anatomy 0.000 description 50
- 238000011144 upstream manufacturing Methods 0.000 description 5
- 238000003466 welding Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/44—Free-space packings
- F16J15/447—Labyrinth packings
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
The invention provides a low-leakage-rate F type staggered tooth labyrinth seal capable of adapting to vibration of a rotor. The low-leakage-rate F type staggered tooth labyrinth seal comprises a fan-shaped ring. The fan-shaped ring comprises the rotor and an installation crown. Two F type sealing teeth are arranged on the upper end surface of the rotor, and two F type sealing teeth are arranged on the lower end surface of the installation crown. Each F type sealing tooth comprises a straight ruler, a first sealing tooth ring and a second sealing tooth ring, wherein the first sealing tooth ring and the second sealing tooth ring are arranged at the ends of the straight ruler. The F type sealing teeth on the rotor are installed in a top-upward mode, the F type sealing teeth on the installation crown are installed in a bottom-upward mode, and the four F type sealing teeth are arranged in an alternating mode and face the direction of incoming flow. The second sealing tooth rings of F type tooth rings on the rotor and the first sealing tooth rings of F type tooth rings on the installation crown are located on the same horizontal position and form a sealing cavity. According to the low-leakage-rate F type staggered tooth labyrinth seal, the leakage rate is low on the condition of guaranteeing vibration of the rotor, and a sealing structure will not lose effect because of vibration of the rotor.
Description
Technical field
The present invention relates to a kind of labyrinth seal, more particularly to a kind of low leakage F type zigzag tooths for being adapted to rotor oscillation
Labyrinth seal, is applied to the sealing of turbomachine rotor axial.
Background technology
Leakage rate is to weigh one of good and bad most important index of sealing member, and the leakage of seal clearance is whole turbomachine
The main source of loss in efficiency.Traditional straight-through labyrinth is widely employed in engineering, seals the throttling effect of crown
The intense vortical of intracavity formation and should be sealed to energy to dissipation, added up reach sealing effectiveness step by step.But due to straight-through leakage
The presence of stream causes the leakage rate of straight-through labyrinth generally larger.When less leakage rate is pursued, more using zigzag tooth
Labyrinth seal structure.Zigzag tooth is staggered on tumbler and static element.Unique cross structure prevents straight-through leakage stream
Presence, so as to reduce leakage rate.
With the development of modern turbomachine, for the control of leakage rate gradually becomes strict, it is desirable to seal fabulous close
Envelope effect.Relative to the high flexible sealing of cost, the structure design of the rigid seal tooth of relative moderate is to pursue relatively low leakage
The universal way of amount.On the premise of excessively manufacture difficulty is not increased, carry out transforming the lower leakage of pursuit to sealing toothing
Amount just becomes particularly significant.
In addition, for non-contact seals, rotor oscillation causes tip clearance to change.Conclusion shows rotor oscillation
The leakage rate of rotor sealing system will substantially be increased and overall efficiency is reduced.One kind is adapted to rotor oscillation, and can be with
The sealing structure of the leakage rate amplification that rotor oscillation brings is controlled so becoming particularly significant.
The content of the invention
The invention aims to ensure there is extremely low leakage rate under conditions of rotor oscillation, it is ensured that sealing structure will not
A kind of low leakage F type zigzag tooth labyrinth seals for being adapted to rotor oscillation are provided because rotor oscillation is failed.
The object of the present invention is achieved like this：Including eccentric circular ring, eccentric circular ring includes rotor, installs hat, the upper end of rotor
The lower surface of face and installation hat is respectively arranged with two F types sealing teeth, and each F types sealing tooth includes ruler and is arranged on ruler
End first sealing ring gear and second sealing ring gear, on rotor F types sealing tooth just installation, install hat F types sealing tooth
Upside down installation, and four F types sealing teeth be alternately arranged and F type ring gears in direction of flow, rotor the second sealing ring gear
Same level position is in the first sealing ring gear for installing the F type ring gears labeled, annular seal space is formed.
Present invention additionally comprises such some architectural features：
1. the eccentric circular ring described in has 6, is 60 °, and 6 eccentric circular rings are combined into circular configuration.
2. the end of the first sealing ring gear and the second sealing ring gear is all provided with being set to the inclined-plane horizontal by 40 ° of angles, and first
The thickness of sealing ring gear and the second sealing ring gear is 0.3mm, and the axial length of the first sealing ring gear is 1.5-3mm；Second is close
The axial length of envelope ring gear is 2-3.5mm.
3. the radial thickness of sealing straight-tooth is：Straight-tooth top thickness is 1-2mm, straight-tooth root thickness is 3-5mm.
4. the axial seal gap of two neighboring F types sealing tooth is 0.2-0.4mm.
Compared with prior art, the invention has the beneficial effects as follows：The present invention is applied to the sealing of turbomachine rotor axial, non-
The sealing structure of contact can effectively reduce the additional leakage loss of rotor oscillation, increase rotor seal effect.The present invention increases
The throttling action that tooth is sealed in F types is added, flow of fluid backflow is abundant, radially more preferably bright with the combined type restriction effect of axial direction
It is aobvious.Due to the parallel sealing ring gear for welding, working medium flowing diametrically is subject to extra throttle effect, and due to sealing tooth
Sealing structure intracavity produces complicated vortex motion, and energy dissipation is accelerated, and reaches extremely low leakage rate and extremely outstanding
Sealing effectiveness.For the impact that rotor oscillation brings, the two parallel sealing teeth of the present invention are adapted to rotor oscillation characteristic changing
The change of the radial clearance brought.Ensure rotor reach vibration any time have at least one sealing ring gear can radial direction produce
Raw throttle effect.
Description of the drawings
Fig. 1 is the structural representation after present invention combination；
Fig. 2 is the structural representation (structural representation of eccentric circular ring) in A-A faces in Fig. 1；
Fig. 3 is the F type alternating expression labyrinth seals chamber schematic diagram of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawings the present invention is described in further detail with specific embodiment.
With reference to Fig. 1 to Fig. 3, whole sealing ring is assembled by 6 independent eccentric circular rings, so ensure that sealing
Ring is installed, positions with casing, while the characteristics of having installation, convenient disassembly and prevent excessive deformation, wherein cutting gap 9
Value be 0.2-0.4mm, wherein orientation angle θ be 5 ° -15 °.By Section A-A it is observed that F types sealing tooth 4 is by inciting somebody to action
Two sealing ring gears 1,2 (the first sealing sealing ring gear 1 of ring gear 2 and second) weld together to realize with straight-tooth 3；On rotor
F types sealing tooth be arranged on rotor 5 into positive F types by groove, the F types sealing tooth labeled be installed be arranged on by groove and installed
Constitute on hat 6 reversed F-typed.Four F types sealing teeth are staggered, and positive F is consistent with reversed F-typed sealing tooth opening direction, in the face of flowing
Direction.By rotor 5 and the F types sealing tooth being arranged in order on hat 6 is installed collectively forms F type sealing structures staggeredly；6 is whole close
The installation hat of seal ring, its effect is that sealing ring and stationary parts are installed fixation；7 is to install the air drain with dismantling for convenience.
The details of the sealing intracavity of F type sealing structures is as shown in figure 3, the structure of F types sealing tooth 4 is by the first sealing tooth
Respectively parallel soldering is collectively formed ring 2 in the bizet and cervical region of straight-tooth with the second sealing ring gear 1, wherein by the overstriking of straight-tooth bottom
Design is to reduce stress so as to fatigue strength, increasing sealing life.Sealing effectiveness under vibration condition is achieved in that
When rotor does not vibrate, the first sealing ring gear 2 and the second sealing ring gear 1 of the positive F types sealing tooth in upstream of inverted f sealing tooth keep system
One horizontal level, now seals ring gear 1,2 and plays throttling action jointly.During rotor oscillation, positive F types sealing ring gear is sent out with rotor
Raw vibration, the sealing ring gear 2 of reversed F-typed sealing ring gear can sealing ring gear 1 lose the throttling function moment play throttle effect with
The shuttle belt of rotor is adapted to the change that leaks.8 is two welding positions for being connected with straight-tooth 3 of sealing ring gears in Fig. 2, weld seam in
The both sides of junction are uniform.
The present invention can also include such some architectural features：
F types annular seal is 1.5-3.5mm with the distance on annular seal space top.
Distance is 0.2-0.4mm at axially adjacent sealing tooth minimum axial gap.
To ensure the intensity and rigidity of sealing member, sealing straight-tooth tooth radial thickness is changing value, and straight-tooth top thickness is 1-
2mm；Straight-tooth root thickness is 3-5mm.
The thickness of the second sealing sealing ring gear 2 of ring gear 1 and first is 0.3mm.
The axial length of the first sealing ring gear 2 is 1.5-3mm；The axial length of the second sealing ring gear 1 is 2-3.5mm.
To ensure two sealing ring gears of level and the preferable restriction effect in upstream seal back of tooth portion by horizontal seal ring gear 1,2
End cut into 40 ° of back parallel angle.
The principle of the present invention is such：Conventional seals straight-tooth is welded into two parallel sealing ring structure F types sealing ring gear.F types
Sealing ring is staggered by groove and label into positive F and inverted f sealing structure installed in rotor and installation.The sealing structure increased
In the throttling action of sealing tooth, flow of fluid backflow is abundant, radially more preferably obvious with the combined type restriction effect of axial direction.Due to weldering
The parallel sealing ring gear for connecing, working medium flowing diametrically is subject to extra throttle effect, and due to sealing toothing sealing
Intracavity produces complicated vortex motion, and energy dissipation is accelerated, and reaches extremely low leakage rate and extremely outstanding sealing effectiveness.
For the impact that rotor oscillation brings, two parallel sealing teeth of this structure are adapted to the radial direction that rotor oscillation characteristic changing brings
The change in gap.Ensure rotor reach vibration any time have at least one sealing ring gear can radial direction produce throttling effect
Should.
By increasing the throttle effect and annular seal space of sealing tooth with the F types labeled sealing toothing is installed installed in rotor
The interior dissipation to kinetic energy is ensureing extremely outstanding sealing effectiveness with extremely low leakage rate.Only need to conventional rigid non-contact seals one
Half sealing ring quantity can reach the same sealing effectiveness.This sealing structure is simple, to the adaptable of rotor, peace
Dress, dismounting, replacement are more convenient.What the special construction of multiple F types sealing teeth was together decided on, between F types sealing ring gear
Mating reaction can fully tackle radial clearance change and the change of leakage rate caused by rotor oscillation, it is ensured that rotor oscillation is not
Leakage rate can be increased.
The object of the present invention is achieved like this：Whole sealing ring is assembled by 6 independent eccentric circular rings.6
The segment angle of fan ring is 60 °.Sealing ring gear 1 is abreast respectively welded at the bizet and neck of sealing straight-tooth 3 with sealing ring gear 2
Portion, by sealing odontoid F types are processed into.F types sealing tooth is alternately arranged on rotor and stator.Its F types sealing tooth is opened
Mouthful towards flowing, as shown in structure Fig. 1.The unique texture of tooth is sealed to increase throttle effect by F types, is increased and is sealed effectively long
Degree, and increase radially throttling.Rotor oscillation causes tooth top top radial clearance cyclically-varying.It is fixed on and the F types labeled is installed
Sealing tooth transfixion, when moving on the F types sealing teeth directional on rotor of upstream, tip clearance reduces, now downstream
Sealing ring gear 1 and 2 plays throttling action jointly.With rotor oscillation, the F types sealing tooth being fixed on rotor moves downwardly to close
When axis residing for envelope ring gear 2 seals the horizontal level of sealing ring gear 1 of tooth less than downstream F types, now the F types on rotor seal tooth
Sealing ring gear 1 lose most throttling function, but now F types sealing ring gear 2 can ensure that rotor motion to before minimum point
Remain that its position is less than upstream seal tooth, it is ensured that sealing tooth throttle effect diametrically is fully realized.In brief,
Just be mounted in and the inverted F-type sealing structure labeled is installed can ensure that in the nargin on rotor oscillation border, axially with radially
The throttle effect of combined type can give full play to, and radially the ability of throttling is as rotor oscillation position determines.Staggeredly
Formula F type sealing toothing is adapted to this condition of rotor oscillation and ensures that vibration will not increase substantially leakage rate.
The invention discloses a kind of low leakage F types zigzag tooth labyrinth seal structure for being adapted to rotor oscillation, the structure
Including can split dismounting sealing ring, installed in sealing ring and the sealing of the straight-tooth labeled of installation and welding parallel with straight-tooth
Circle.The present invention increases the throttle effect of radial direction using the F types sealing structure that sealing ring and straight-tooth are constituted.Adjacent seals tooth
Arrangement mode ensures that in the up-and-down boundary of rotor oscillation, at least one horizontal seal circle can play throttling action.Utilize
F types seal the compound seal form that axially flowing sealing is converted into tooth self structure radial direction and axial direction.It is close such that it is able to reduce
The leakage rate of envelope system, and rotor oscillation is adapted to, weaken the increase that rotor oscillation brings leakage rate, improve turbomachine
Efficiency.Meanwhile, larger radial clearance can fully avoid sealing collision and the friction that tooth is avoided with rotor or stator.
Namely the present invention includes that the positive F types being arranged on rotor seal ring gear；Installed in the reversed F-typed sealing tooth installed in hat
Ring；The parallel sealing circle being embedded on straight-tooth, with straight-tooth F type sealing structures are collectively formed；Parallel sealing in F type sealing structures
Circle top constitutes radial seal gap with rotor or installation hat；Parallel sealing circle border and upstream seal in F type sealing structures
Back of tooth portion constitutes axial seal gap；Positive F types sealing structure collectively constitutes sealed chamber with reversed F-typed sealing structure.
It is notching construction to install crown end, and groove depth is 2-3mm；Its both sides is equipped with air drain.Positive F type sealing rings are logical
Cross groove to be installed on rotor；Reversed F-typed sealing ring is to be installed in installing in hat by groove；F types sealing tooth is parallel
Sealing ring is embedded in straight-tooth sealing ring bizet and cervical region.
Claims (9)
1. a kind of low leakage F type zigzag tooth labyrinth seals for being adapted to rotor oscillation, it is characterised in that：Including eccentric circular ring, fan
Shape ring includes rotor, installs hat, and the upper surface of rotor and the lower surface of installation hat are respectively arranged with two F types sealing teeth, each F
Type sealing tooth all includes straight-tooth and is arranged on the first sealing ring gear and the second sealing ring gear of straight-tooth end, and the F types on rotor are close
Envelope tooth just installation, the F types sealing tooth of installing hat upside down installations, and four F types seal teeth and are alternately arranged and in the face of direction of flow,
Second sealing ring gear of the F types sealing tooth on rotor is in same water with the first sealing ring gear for installing the F types sealing tooth labeled
Prosposition is put, and forms annular seal space.
2. a kind of low leakage F type zigzag tooth labyrinth seals for being adapted to rotor oscillation according to claim 1, its feature
It is：Described eccentric circular ring has 6, is 60 °, and 6 eccentric circular rings are combined into circular configuration.
3. a kind of low leakage F type zigzag tooth labyrinth seals for being adapted to rotor oscillation according to claim 1 and 2, its
It is characterised by：The end of the first sealing ring gear and the second sealing ring gear is all provided with being set to the inclined-plane horizontal by 40 ° of angles, and first is close
The thickness of envelope ring gear and the second sealing ring gear is 0.3mm, and the axial length of the first sealing ring gear is 1.5-3mm；Second sealing
The axial length of ring gear is 2-3.5mm.
4. a kind of low leakage F type zigzag tooth labyrinth seals for being adapted to rotor oscillation according to claim 1 and 2, its
It is characterised by：Sealing the radial thickness of straight-tooth is：Straight-tooth top thickness is 1-2mm, straight-tooth root thickness is 3-5mm.
5. a kind of low leakage F type zigzag tooth labyrinth seals for being adapted to rotor oscillation according to claim 3, its feature
It is：Sealing the radial thickness of straight-tooth is：Straight-tooth top thickness is 1-2mm, straight-tooth root thickness is 3-5mm.
6. a kind of low leakage F type zigzag tooth labyrinth seals for being adapted to rotor oscillation according to claim 1 and 2, its
It is characterised by：The axial seal gap of two neighboring F types sealing tooth is 0.2-0.4mm.
7. a kind of low leakage F type zigzag tooth labyrinth seals for being adapted to rotor oscillation according to claim 3, its feature
It is：The axial seal gap of two neighboring F types sealing tooth is 0.2-0.4mm.
8. a kind of low leakage F type zigzag tooth labyrinth seals for being adapted to rotor oscillation according to claim 4, its feature
It is：The axial seal gap of two neighboring F types sealing tooth is 0.2-0.4mm.
9. a kind of low leakage F type zigzag tooth labyrinth seals for being adapted to rotor oscillation according to claim 5, its feature
It is：The axial seal gap of two neighboring F types sealing tooth is 0.2-0.4mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510882438.1A CN105318011B (en) | 2015-12-03 | 2015-12-03 | Low-leakage-rate F type staggered tooth labyrinth seal capable of adapting to vibration of rotor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510882438.1A CN105318011B (en) | 2015-12-03 | 2015-12-03 | Low-leakage-rate F type staggered tooth labyrinth seal capable of adapting to vibration of rotor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105318011A CN105318011A (en) | 2016-02-10 |
| CN105318011B true CN105318011B (en) | 2017-04-12 |
Family
ID=55246025
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510882438.1A Expired - Fee Related CN105318011B (en) | 2015-12-03 | 2015-12-03 | Low-leakage-rate F type staggered tooth labyrinth seal capable of adapting to vibration of rotor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105318011B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105673862A (en) * | 2016-03-24 | 2016-06-15 | 国家电网公司 | Circumferential brush type catch air seal |
| US11293295B2 (en) | 2019-09-13 | 2022-04-05 | Pratt & Whitney Canada Corp. | Labyrinth seal with angled fins |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB346726A (en) * | 1928-10-09 | 1931-04-15 | Ass Elect Ind | Improvements relating to labyrinth packing |
| CN2400576Y (en) * | 1999-12-24 | 2000-10-11 | 骆义根 | Double-tooth-tip multitooth glands |
| CN101907171A (en) * | 2009-06-02 | 2010-12-08 | 刘美琴 | Labyrinth seal |
| US20110280715A1 (en) * | 2010-05-11 | 2011-11-17 | General Electric Company | Curved labyrinth seals |
| DE102010026336A1 (en) * | 2010-07-07 | 2012-01-12 | Siemens Aktiengesellschaft | A shaft sealing apparatus |
| US20140064909A1 (en) * | 2012-08-28 | 2014-03-06 | General Electric Company | Seal design and active clearance control strategy for turbomachines |
| CN103277146A (en) * | 2013-05-15 | 2013-09-04 | 山东青能动力股份有限公司 | Symmetrical lateral tooth steam sealing structure |
| CN205207690U (en) * | 2015-12-03 | 2016-05-04 | 哈尔滨工程大学 | Crisscross tooth labyrinth seals of low leakage F type that can adapt to rotor oscillation |
-
2015
- 2015-12-03 CN CN201510882438.1A patent/CN105318011B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
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| CN105318011A (en) | 2016-02-10 |
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Granted publication date: 20170412 |