CN108361384B - A kind of labyrinth seal structure with inner concave shape sealing tooth - Google Patents
A kind of labyrinth seal structure with inner concave shape sealing tooth Download PDFInfo
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- CN108361384B CN108361384B CN201810481310.8A CN201810481310A CN108361384B CN 108361384 B CN108361384 B CN 108361384B CN 201810481310 A CN201810481310 A CN 201810481310A CN 108361384 B CN108361384 B CN 108361384B
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- Prior art keywords
- tooth
- concave shape
- inner concave
- labyrinth seal
- sealing
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- 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
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- 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 discloses a kind of labyrinth seal structures with inner concave shape sealing tooth, the labyrinth seal structure core is that seal tooth is designed using interior concave arc, and interior concave arc is determined by the vertical transition distance and addendum width of throat section height, interior concave arc and tooth top.The flow channel that the inner concave shape sealing tooth and canned rotor of this labyrinth seal structure are constituted can enhance the frequency dependence of sealing effective damping, reduce effective damping item cross-over frequency, to improve the frequency range of sealing safe and stable operation, achieve the purpose that enhance canned rotor stability.In addition, inner concave shape sealing tooth design of the invention is not related to seal clearance variation, therefore, the seal performance of good seal still can be guaranteed by controlling seal clearance.Numerically modeling shows that the labyrinth seal structure with inner concave shape sealing tooth of the invention can make to be sealed with 6.4% or more effect damping term cross-over frequency reduction after reasonable parameter designing.
Description
Technical field
The invention belongs to impeller machinery technical field more particularly to a kind of labyrinth seal knots with inner concave shape sealing tooth
Structure.
Background technique
In the turbomachines such as steam turbine, gas turbine, pump and compressor, rotatory sealing is mounted on rotary part and quiet
Between stop part, the effect that control passes through leakage flow of the dynamic and static gaps from higher-pressure region to low-pressure area mainly carry.Often at present
Rotary seal structure has labyrinth seal, honeycomb seal, pass sealing, pouch-type damping seal and brush seal, and labyrinth is close
Envelope is due to allowing rotary part and quiet when its reliable seal performance, relatively low manufacturing cost, easy for installation and installation
Stop part not stringent centering the advantages that and be used widely in turbomachinery through-flow dynamic and static gaps control.
Result of study shows that labyrinth seal has good seal performance, however produces in sealed chamber under the high revolving speed of high pressure
Raw unsteady flow exciting force is easy to induce rotor unstability, and then limits further hair of the labyrinth seal in industrial applicability
Exhibition.Currently, being solved there are mainly two types of mode: in engineering aiming at the problem that labyrinth seal causes rotor unstability first is that labyrinth is close
Envelope is changed to the more excellent damping seal of rotor stability performance, such as honeycomb seal, pass sealing, pouch-type damping seal；Two
Be sealing entrance install a kind of anti-rotating plate structure for being able to suppress chamber air-flow circumferential flow or introduce can generate with
The jet flow groove of the contrary flowing of chamber interior air-flow circumferential flow enhances rotor stability.However these solve labyrinth seal and turn
The design of structure required by sub- destabilization problems method is relative complex, has masked labyrinth seal manufacture and has installed simple advantage,
Therefore, the requirement of sealing leak amount and rotor stability can be taken into account if there is a kind of novel labyrinth seal structure, and is protected
Stay labyrinth seal manufacture that simple and convenient advantage is installed, then the application model of labyrinth seal in practice in engineering will certainly will be promoted
It encloses, there is important engineering significance.
Summary of the invention
The present invention is wanted for the labyrinth seal enhancing rotor stability for having obtained a large amount of industrial applications in turbomachine
It asks, proposes a kind of novel labyrinth seal structure, it is especially a kind of to be sealed with the inner concave shape that can be improved canned rotor stability
The labyrinth seal structure of tooth.Studies have shown that this inner concave shape sealing tooth can change different frequency of vortex motion downstreams act on it is close
The exciting force-responsive on rotor is sealed, the frequency dependence of enhancing sealing effective damping reduces and seals effective damping term cross-over frequency,
To improve the frequency range of sealing safe and stable operation, achieve the purpose that increase canned rotor stability.
The purpose of the present invention is achieved through the following technical solutions:
A kind of labyrinth seal structure with inner concave shape sealing tooth, the labyrinth seal structure include being set in qually spaced in sealing
Several inner concave shapes of stator seal tooth, and inner concave shape, which seals tooth, can change different whirling motion frequencies from the flow channel that canned rotor is constituted
Rate downstream acts on the exciting force-responsive on canned rotor, and the section outer profile of each inner concave shape sealing tooth includes being arranged in parallel
Tooth top straightway and tooth root straightway, and inner concave shape sealing tooth addendum width be less than tooth root width, tooth top straightway and tooth
The both ends of root straightway pass through symmetrically arranged vertical transition straightway, interior concave arc is connected with tangent section, tangent section with it is right
Circle is tangent where the interior concave arc answered.
A further improvement of the present invention lies in that the addendum width of inner concave shape sealing tooth is less than the half of tooth root width.
A further improvement of the present invention lies in that the length of vertical transition straightway, i.e., the vertically passing of interior concave arc and tooth top
Crossing distance is 0.05mm-0.1mm.
A further improvement of the present invention lies in that the center of circle of interior concave arc is located on the contour of throat section.
A further improvement of the present invention lies in that the center of circle of interior concave arc is located at the end of throat section and vertical transition straightway
Point line perpendicular bisector on, i.e., the center of circle be throat section contour and perpendicular bisector intersection point.
A further improvement of the present invention lies in that arc angle corresponding to the following circular arc in throat section of inner concave shape sealing tooth
Less than or equal to 90 °.
A further improvement of the present invention lies in that inner concave shape sealing tooth is applied to straight-through labyrinth, forward staged
On the sealing stator of labyrinth seal, backward step labyrinth and alternating expression labyrinth seal.
The invention has the following beneficial technical effects:
The labyrinth seal structure provided by the invention that can be improved rotor stability, core are to seal tooth and use have one
The circular arc for determining radius carries out indent design.The flow channel that this inner concave shape sealing tooth and rotor wall surface are constituted can change not
The exciting force-responsive on canned rotor, the frequency dependence of enhancing sealing effective damping, drop are acted on frequency of vortex motion downstream
The low effective damping term cross-over frequency of sealing reaches increase canned rotor to improve the frequency range of sealing safe and stable operation
The purpose of stability.On the other hand, inner concave shape of the invention sealing tooth is not related to seal clearance, and therefore, good seal is obturaged
Performance still can be guaranteed by controlling seal clearance.Comprehensively consider, the labyrinth with inner concave shape sealing tooth of the invention
Sealing structure can take into account the requirement of sealing leak amount and rotor stability, and it is simple and convenient to retain labyrinth seal manufacture installation
The advantages of, application range of the labyrinth seal in engineering in practice certainly will will be promoted, there is important engineering significance.
Detailed description of the invention
Fig. 1 is the inner concave shape sealing tooth labyrinth seal two dimensional cross-section structure of design；
Fig. 2 is the partial enlarged view of inner concave shape sealing tooth；
Fig. 3 is the two dimensional cross-section structure of the step labyrinth forward with inner concave shape sealing tooth
Fig. 4 is the two dimensional cross-section structure of the sealing of staged backward with inner concave shape sealing tooth；
Fig. 5 is the alternating expression labyrinth seal two dimensional cross-section structure with inner concave shape sealing tooth.
In figure: 1 is canned rotor；2 be sealing stator；3 seal tooth for inner concave shape；4 be tooth root width；5 be addendum width；
6 be seal clearance；7 be the vertical transition distance of interior concave arc and tooth top；8 be throat section；9 be throat section height；10 are
Throat section width；11 be throat section contour；12 be the endpoint line of throat section and vertical transition straightway；13 are
Vertical line；14 be the center of circle；15 be arc angle corresponding to the following circular arc in throat section；16 be interior concave arc；17 be interior concave arc
Place circle；18 be tangent section；19 be throat section endpoint；20 be vertical transition straightway endpoint；21 be circular arc point of contact.
Specific embodiment
Present invention will now be described in detail with reference to the accompanying drawings..
Referring to Fig. 1, a kind of labyrinth seal structure with inner concave shape sealing tooth provided by the invention, core is indent
Type seals tooth 3 and carries out what indent design was completed using the interior concave arc 16 with certain radius, including is set in qually spaced in sealing
Several inner concave shapes of stator 2 seal tooth 3, and inner concave shape, which seals tooth 3, can change different whirlpools from the flow channel that canned rotor 1 is constituted
Dynamic frequency downstream acts on the exciting force-responsive on canned rotor, and the section outer profile of each inner concave shape sealing tooth 3 includes flat
The tooth top straightway and tooth root straightway of row setting, and addendum width 5 is less than tooth root width 4, tooth top straightway and tooth root straight line
Section both ends pass through symmetrically arranged vertical transition straightway, interior concave arc 16 is connected with tangent section 18, tangent section 18 with it is right
Circle 17 is tangent where the interior concave arc answered.
Referring to fig. 2, the interior concave arc of the inner concave shape sealing tooth 3 and the vertical transition distance 7 of tooth top should be use up in design
It is possible small, so as to ignore the influence to sealing air-flow flowing, 0.05mm-0.1mm is selected as in the present invention.
Participate in Fig. 2, according to mathematical relationship it is recognised that when two circle it is outer from when, the linear distance by the two round hearts is most short.
Therefore, the center of circle 14 of the interior concave arc 16 of the inner concave shape sealing tooth 3 is located on throat section contour 11.
Referring to fig. 2, the throat section width 10 of the inner concave shape sealing tooth 3 needs to obtain by strength Calculation.
Referring to fig. 2, the interior concave arc 16 of the inner concave shape sealing tooth 3 is based on throat section height 9, interior concave arc and tooth
What the vertical transition distance 7 and addendum width 5 on top were determined.According to mathematical relationship it is recognised that passing through throat section end
The center of circle 14 of the interior concave arc 16 of point 19 and vertical transition straightway endpoint 20 should be located at throat section and vertical transition straightway
Endpoint line 12 perpendicular bisector 13 on.On the other hand, the center of circle 14 is similarly positioned on throat section contour 11.Therefore, throat
The intersection point of section contour 11 and perpendicular bisector 13 is exactly the center of circle 14.It is then based on the center of circle 14 and throat section endpoint 19 and vertically passing
Circle 17 where interior concave arc can be made by crossing straightway endpoint 20.Then made tooth root endpoint to make and circle 17 where interior concave arc
Tangent tangent section 18, obtains the position at circular arc point of contact 21.Circle between vertical transition straightway endpoint 20 and circular arc point of contact 21
Arc is exactly interior concave arc 16.
Referring to fig. 2, the addendum width 5 of the inner concave shape sealing tooth 3 is less than the half of tooth root width 4.
Referring to fig. 2, arc angle 15 corresponding to the following circular arc in throat section of the inner concave shape sealing tooth 3 is less than or waits
In 90 °.
Referring to Fig. 1, Fig. 2, the structure design of the inner concave shape sealing tooth 3 is independent of each other with seal clearance 6, therefore, described
The superior seal performance of labyrinth seal with inner concave shape sealing tooth can still be by control seal clearance 6 and be guaranteed.
Referring to Fig. 3 to Fig. 5, the inner concave shape sealing tooth 3 can be applied not only to straight-through labyrinth, it can also be used to forward
On the sealing stator 2 of the sealings such as step labyrinth, backward step labyrinth, alternating expression labyrinth seal.
Technical principle of the invention is as follows:
The labyrinth seal structure provided by the invention that can be improved rotor stability, core are that it seals tooth 3 using tool
There is the interior concave arc 16 of certain radius to be designed, and interior concave arc 16 is based on throat section height 9, interior concave arc and tooth top
Vertical transition distance 7 and addendum width 5 be determined.The flowing that this inner concave shape sealing tooth 3 and canned rotor 1 are constituted
Channel can change the exciting force-responsive that different frequency of vortex motion downstreams act on canned rotor, enhancing sealing effective damping
Frequency dependence reduces and seals effective damping term cross-over frequency, to improve the frequency range of sealing safe and stable operation, reaches
Increase the purpose of canned rotor stability.On the other hand, inner concave shape of the invention sealing 3 structure of tooth design is not related between sealing
Gap 6, therefore, the seal performance of good seal still can be guaranteed by controlling seal clearance 6.Comprehensively consider, the present invention
The labyrinth seal structure with inner concave shape sealing tooth 3 can take into account the requirement of sealing leak amount and rotor stability, and protect
It stays labyrinth seal manufacture that simple and convenient advantage is installed, certainly will will promote application range of the labyrinth seal in engineering in practice, tool
There is important engineering significance.Numerically modeling shows the labyrinth seal structure with inner concave shape sealing tooth 3 of the invention by reasonable
Parameter designing after can be sealed with effect damping term cross-over frequency and reduce by 6.4% or more.
Claims (6)
1. a kind of labyrinth seal structure with inner concave shape sealing tooth, which is characterized in that the labyrinth seal structure includes equidistant
Several inner concave shapes sealing tooth (3) in sealing stator (2) is set, and inner concave shape seals the flowing that tooth (3) and canned rotor (1) are constituted
Channel can change the exciting force-responsive that different frequency of vortex motion downstreams act on canned rotor, and each inner concave shape seals tooth
(3) section outer profile includes tooth top straightway and tooth root straightway disposed in parallel, and inner concave shape seals the tooth top width of tooth (3)
It spends (5) and is less than tooth root width (4), the both ends of tooth top straightway and tooth root straightway pass through symmetrically arranged vertical transition straight line
Section, interior concave arc (16) are connected with tangent section (18), and tangent section (18) and circle (17) where corresponding interior concave arc are tangent, wherein
The vertical transition distance (7) of the length of vertical transition straightway, i.e., interior concave arc and tooth top is 0.05mm-0.1mm.
2. a kind of labyrinth seal structure with inner concave shape sealing tooth according to claim 1, which is characterized in that inner concave shape
The addendum width (5) for sealing tooth (3) is less than the half of tooth root width (4).
3. a kind of labyrinth seal structure with inner concave shape sealing tooth according to claim 1, which is characterized in that indent circle
The center of circle (14) of arc (16) is located on throat section contour (11).
4. a kind of labyrinth seal structure with inner concave shape sealing tooth according to claim 3, which is characterized in that indent circle
The center of circle (14) of arc (16) is located on the perpendicular bisector (13) of the endpoint line (12) of throat section and vertical transition straightway, i.e., round
The heart (14) is the intersection point of throat section contour (11) and perpendicular bisector (13).
5. a kind of labyrinth seal structure with inner concave shape sealing tooth according to claim 1, which is characterized in that inner concave shape
It seals arc angle (15) corresponding to the following circular arc in throat section of tooth (3) and is less than or equal to 90 °.
6. a kind of labyrinth seal structure with inner concave shape sealing tooth according to claim 1, which is characterized in that the indent
Type seal tooth (3) be applied to straight-through labyrinth, forward step labyrinth, backward step labyrinth and staggeredly
On the sealing stator (2) of formula labyrinth seal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810481310.8A CN108361384B (en) | 2018-05-18 | 2018-05-18 | A kind of labyrinth seal structure with inner concave shape sealing tooth |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810481310.8A CN108361384B (en) | 2018-05-18 | 2018-05-18 | A kind of labyrinth seal structure with inner concave shape sealing tooth |
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| Publication Number | Publication Date |
|---|---|
| CN108361384A CN108361384A (en) | 2018-08-03 |
| CN108361384B true CN108361384B (en) | 2019-10-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810481310.8A Active CN108361384B (en) | 2018-05-18 | 2018-05-18 | A kind of labyrinth seal structure with inner concave shape sealing tooth |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113154047B (en) * | 2021-04-30 | 2023-04-11 | 西安交通大学 | Self-rotation-stopping labyrinth seal based on addendum winglet structure and processing method thereof |
| CN114183532A (en) * | 2021-11-25 | 2022-03-15 | 沈阳鼓风机集团股份有限公司 | Sealing structure of turbine and turbine |
| US11873816B2 (en) * | 2021-12-14 | 2024-01-16 | Regi U.S., Inc. | Rotary vane device with longitudinally extending seals |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2913750Y (en) * | 2005-07-28 | 2007-06-20 | 上海大学 | Labyrinth sealing device having high hermeticity and high operation stability |
| DE102009055913A1 (en) * | 2009-11-27 | 2011-06-09 | Rolls-Royce Deutschland Ltd & Co Kg | Labyrinth seal e.g. tripping collar labyrinth seal, for aircraft gas turbine, has sealing ring comprising upper flank region coated with wear resistant material, where flank region has slew rate that is reduced against lower flank region |
| CN202851974U (en) * | 2012-09-26 | 2013-04-03 | 上海交通大学 | Tooth-shaped structure capable of self-restraining effective flow area |
| EP3293360A1 (en) * | 2016-09-13 | 2018-03-14 | United Technologies Corporation | Seal system with primary and secondary seal arrangement |
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