CN103090012A - Novel high stability dislocation four gas wedge seal structure - Google Patents
Novel high stability dislocation four gas wedge seal structure Download PDFInfo
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- CN103090012A CN103090012A CN2013100270133A CN201310027013A CN103090012A CN 103090012 A CN103090012 A CN 103090012A CN 2013100270133 A CN2013100270133 A CN 2013100270133A CN 201310027013 A CN201310027013 A CN 201310027013A CN 103090012 A CN103090012 A CN 103090012A
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- 238000007789 sealing Methods 0.000 claims abstract description 62
- 210000004907 gland Anatomy 0.000 claims description 10
- 230000005284 excitation Effects 0.000 abstract description 3
- 239000012530 fluid Substances 0.000 description 6
- 101100537937 Caenorhabditis elegans arc-1 gene Proteins 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
一种新型高稳定错位四气楔密封结构，包括密封套和密封体，密封体固定在密封套上，密封体上有周向的迷宫密封齿，密封齿分为四段等长圆弧结构，这四段圆弧的包角小于90゜，四段圆弧分别以圆弧的中点A，B，C，D顺时针旋转一定角度，使得各段圆弧间均有一错位距离ε，错位后四段圆弧的圆心分别为O1、O2、O3、O4，且各段圆弧的圆心距离密封几何中心位置的距离均为δ，其中0＜ε＜R-r，0＜δ＜R-r，R为四段圆弧的半径，r为转子的半径，转子的圆心为O。本发明结构简单，任何传统圆形密封都可以据此改变为相应的密封结构；与传统圆形密封相比，椭圆密封在工作中形成上下两个气楔，形成两个动压气膜，增加了动压气膜的约束，提高了密封的气膜刚度，有助于提高稳定性，提高密封的抗气流激振能力。
A new type of highly stable dislocation four-wedge sealing structure, including a sealing sleeve and a sealing body. The sealing body is fixed on the sealing sleeve. There are circumferential labyrinth sealing teeth on the sealing body. The sealing teeth are divided into four equal-length circular arc structures. The wrap angles of these four arcs are less than 90゜, and the four arcs are rotated clockwise by a certain angle with the midpoints A, B, C, and D of the arcs, so that there is a misalignment distance ε between each arc. After the misalignment The centers of the four arcs are O 1 , O 2 , O 3 , O 4 respectively, and the distance between the centers of each arc and the geometric center of the seal is δ, where 0<ε<Rr, 0<δ<Rr , R is the radius of the four arcs, r is the radius of the rotor, and the center of the rotor is O. The structure of the invention is simple, and any traditional circular seal can be changed into a corresponding sealing structure accordingly; compared with the traditional circular seal, the elliptical seal forms two upper and lower air wedges during work, forming two dynamic pressure air films, increasing the The constraint of the dynamic pressure air film improves the rigidity of the sealed air film, helps to improve the stability, and improves the anti-airflow excitation ability of the seal.
Description
Technical field: the present invention relates to a kind of sealing configuration that is applied in rotating machinery, relate in particular to a kind of Novel high-stability dislocation four gas wedge sealing configurations.
Background technique: sealing configuration is the critical component of the rotating machineries such as aeroengine, steam turbine, compressor, and sealing configuration also can produce Airflow Exciting-Vibration Force when suppressing the rotating machinery fluid leakage, affect rotor stability.Along with improving constantly of rotating machinery working medium parameter, the caused flow-induced vibration problem of air-flow power that is produced by sealing configuration is more and more outstanding.
It is similar to the hydrodynamic sliding bearing action principle that sealed motive force is learned principle.Sealing configuration air film gap has possessed the necessary condition that forms the dynamic pressure air film: 1. form wedge gap between rotor and stator; 2. be full of continuously viscous liquid between rotor and stator; 3. between rotor and stator, speed of related movement is arranged.The oil whip phenomenon of the flow-induced vibration phenomenon that sealing configuration gap flow power produces and sliding bearing gap oil-film force generation interosculates: be all 1. that rotating machinery micro-gap fluid produces, all belong to the fluid exciting; 2. the fluid excitation principle is identical, be all to make rotor eddy by tangential fluid excitation force, when frequency of vortex motion and rotor intrinsic frequency near the time, produce the fluid exciting; 3. oscillation phenomenon is identical, all belongs to self-excited vibration, makes rotating machinery produce low-frequency vibration.For sliding bearing, bearing type is very large on the impact of stability, the less stable of cylinder sliding bearing, in order to improve the working stability of bearing, often bearing is made the multi-oil wedge floating-ring shape, compare with the simgle oil wedge bearing of traditional cylinder sliding bearing, the multi-oil wedge floating-ring sliding bearing has been set up additional hydrodynamic, improved anti-unstability nargin, dislocation four oil film wedge sliding bearings are typical multi-oil wedge floating-ring sliding bearings, are widely used in engineering design.
In recent years, for improving the stability of sealing, reduce Airflow Exciting-Vibration Force, people have proposed the novel seal patterns such as honeycomb, derotation stream, damping, pocket type by the structure that changes sealing itself on the basis of traditional labyrinth seal, obtained certain effect.But updating of sealing configuration pattern causes structure to become increasingly complex, and easily produces the unstable vibration fault that causes due to friction.Although the sealing configuration mechanism of above-mentioned form is incomplete same, all belong in essence circular seal, i.e. sealing is circle along circumferential structure.For circular seal, the gas bearing effect that produces in the wedge gap of air-flow between eccentric rotor and stator is the key factor that causes sealing flow-induced vibration.Therefore, the flow-induced vibration problem can not be solved at all.
Summary of the invention: for above-mentioned the deficiencies in the prior art, the invention provides a kind of Novel high-stability dislocation four gas wedge sealing configurations.
For achieving the above object, the technical solution used in the present invention is: a kind of Novel high-stability dislocation four gas wedge sealing configurations, comprise stuffing box gland and seal, seal is fixed on stuffing box gland, circumferential labyrinth seal tooth is arranged on seal, the sealing tooth is divided into four sections isometric arc structures, the cornerite of this four arcs is less than 90 ゜, four arcs is respectively with the mid point A of circular arc, B, C, the D several angle that turns clockwise, making all has a dislocation apart from ε between each section circular arc, to increase the degree of convergence of wedge gap, strengthen blanket gas wedge pressure.After dislocation, the center of circle of four arcs is respectively O
1, O
2, O
3, O
4, and the distance of center circle of each section circular arc is δ from the distance of sealing geometrical center position.0＜ε＜R-r wherein, 0＜δ＜R-r, R are the radius of four arcs, and r is the radius of rotor, and the center of circle of rotor is O, and the rotating speed of rotor is ω.
The present invention uses for reference the thought of dislocation four oil film wedge sliding bearings, does not change the overall structure of traditional circular seal, and traditional circular seal design is become dislocation four gas wedge sealing configurations, and its major advantage is as follows:
1, simple in structure, any fixed sealing such as labyrinth seal, honeycomb seal, brush seal etc. can be changed into corresponding dislocation four gas wedge labyrinth seals, dislocation four gas wedge honeycomb seals, dislocation four gas wedge brush seals etc. accordingly;
2, compare with traditional circular seal, dislocation four gas wedge sealings form four the gas wedges in up and down at work, form four dynamic pressure air films.Misconstruction has increased blanket gas wedge degree of convergence, has increased the constraint of dynamic pressure air film, has improved the gas film stiffness of sealing, helps to improve stability, improves the anti-flow-induced vibration ability of sealing.
Description of drawings:
Fig. 1 is structural representation of the present invention.
Fig. 2 is the dislocation four circumferential partial views of gas wedge sealing configuration.
Fig. 3 is that attempt dislocation four gas wedge sealing configuration axial parts.
In figure: 1-the first sealing tooth circular arc; 2-the second sealing tooth circular arc; 3-the 3rd sealing tooth circular arc; 4-the 4th sealing tooth circular arc; The 5-air film; The 6-rotor; The 7-stuffing box gland; 8-T type groove; The 9-seal; 10-seals tooth.
Embodiment:
as shown in Figure 1-Figure 3, a kind of Novel high-stability dislocation four gas wedge sealing configurations, comprise stuffing box gland 7, T-shaped groove 8 and seal 9, be provided with T-shaped groove 8 in stuffing box gland 7, seal 9 is fixed together with stuffing box gland 7 by the T-shaped groove 8 that makes progress at circumferencial direction, circumferential labyrinth seal tooth 10 is arranged on seal 9, form air film 5 between sealing tooth 10 and rotor 6, sealing tooth 10 is divided into four sections isometric arc structures: the first sealing tooth circular arc 1, the second sealing tooth circular arc 2, the 3rd sealing tooth circular arc 3, the 4th sealing tooth circular arc 4, the cornerite of this four arcs is less than 90 ゜, four arcs is respectively with the mid point A of circular arc, B, C, the D several angle that turns clockwise, making all has a dislocation apart from ε between each section circular arc, to increase the degree of convergence of wedge gap, strengthen blanket gas wedge pressure.After dislocation, the center of circle of circular arc 1 is O
1, the center of circle of circular arc 2 is O
2, the center of circle of circular arc 3 is O
3, the center of circle of circular arc 4 is O
4, the distance of center circle of four arcs is δ from the distance of sealing geometrical center position, 0＜ε＜R-r wherein, and 0＜δ＜R-r, R are the radius of four arcs, and r is the radius of rotor, and the center of circle of rotor is O, and the rotating speed of rotor is ω.
Like this, the relative sliding surface formation oil film between rotor and stator produces dynamic pressure under the wedge gap between rotor and stator.The characteristics that the four gas wedges that misplace seal are: compare with traditional circular seal, dislocation four gas wedge sealing configurations form four the gas wedges in up and down at work, form four dynamic pressure air films, have increased the constraint of dynamic pressure air film, have strengthened the stability of sealing; And dislocation type four gas wedge sealing configurations have increased the degree of convergence of blanket gas wedge, have increased blanket gas wedge power, have improved the gas film stiffness of sealing, help to improve sealing stability, improve the anti-flow-induced vibration ability of sealing.
The present invention continues to use current a lot of fixing seal fixing T-shaped groove mounting type is installed.Dislocation four gas wedge sealings are designed to be fixed in the fixed component of the T-shaped groove of cylinder, do not change the overall structure of traditional circular seal, only the sealing toothed portion with conventional seals changes four sections isometric arc structures into by round structure.When rotor rotates, form four gas wedges, form four dynamic pressure air films, the dislocation sealing configuration improves blanket gas wedge degree of convergence, has increased the constraint of dynamic pressure air film, has strengthened the sealing gas film stiffness, helps to improve the stability of sealing.The sealing block material is common 45 steel, GC
r15Deng material.
Claims (2)
1. Novel high-stability dislocation four gas wedge sealing configurations, comprise stuffing box gland and seal, seal is fixed on stuffing box gland, it is characterized in that: circumferential labyrinth seal tooth is arranged on seal, the sealing tooth is divided into four sections isometric arc structures, the cornerite of this four arcs is less than 90 ゜, and four arcs is respectively with the mid point A of circular arc, B, C, the D several angle that turns clockwise, making all has a dislocation apart from ε between each section circular arc, and after dislocation, the center of circle of four arcs is respectively O
1, O
2, O
3, O
4, and the distance of center circle of each section circular arc is δ from the distance of sealing geometrical center position, 0＜ε＜R-r wherein, and 0＜δ＜R-r, R are the radius of four arcs, and r is the radius of rotor, and the center of circle of rotor is O.
2. a kind of Novel high-stability dislocation as claimed in claim 1 four gas wedge sealing configurations, it is characterized in that: be provided with T-shaped groove in stuffing box gland, seal is fixed together by make progress at circumferencial direction T-shaped groove and stuffing box gland.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013100270133A CN103090012A (en) | 2013-01-18 | 2013-01-18 | Novel high stability dislocation four gas wedge seal structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013100270133A CN103090012A (en) | 2013-01-18 | 2013-01-18 | Novel high stability dislocation four gas wedge seal structure |
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| CN103090012A true CN103090012A (en) | 2013-05-08 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08338537A (en) * | 1995-06-09 | 1996-12-24 | Toshiba Corp | Labyrinth seal |
| JP2002266605A (en) * | 2001-02-28 | 2002-09-18 | Ronald E Brandon | Non-retractable segmented packing ring for fluid turbine having special spring for reducing force between shaft friction |
| JP2005214144A (en) * | 2004-01-30 | 2005-08-11 | Toshiba Corp | Swirl flow prevention device for fluid machinery |
| EP2141363A2 (en) * | 2008-06-30 | 2010-01-06 | Hitachi, Ltd. | Seal for turbomachine |
| US20120121411A1 (en) * | 2010-11-12 | 2012-05-17 | Hitachi, Ltd. | Labyrinth Seals for Turbomachinery |
| CN202370592U (en) * | 2011-12-20 | 2012-08-08 | 范宏财 | Scale type arrangement steam seal belt for steam turbine and steam seal device for steam turbine |
| CN102834589A (en) * | 2010-02-25 | 2012-12-19 | 三菱重工业株式会社 | Turbine |
-
2013
- 2013-01-18 CN CN2013100270133A patent/CN103090012A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08338537A (en) * | 1995-06-09 | 1996-12-24 | Toshiba Corp | Labyrinth seal |
| JP2002266605A (en) * | 2001-02-28 | 2002-09-18 | Ronald E Brandon | Non-retractable segmented packing ring for fluid turbine having special spring for reducing force between shaft friction |
| JP2005214144A (en) * | 2004-01-30 | 2005-08-11 | Toshiba Corp | Swirl flow prevention device for fluid machinery |
| EP2141363A2 (en) * | 2008-06-30 | 2010-01-06 | Hitachi, Ltd. | Seal for turbomachine |
| CN102834589A (en) * | 2010-02-25 | 2012-12-19 | 三菱重工业株式会社 | Turbine |
| US20120121411A1 (en) * | 2010-11-12 | 2012-05-17 | Hitachi, Ltd. | Labyrinth Seals for Turbomachinery |
| CN202370592U (en) * | 2011-12-20 | 2012-08-08 | 范宏财 | Scale type arrangement steam seal belt for steam turbine and steam seal device for steam turbine |
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Application publication date: 20130508 |