CN104912604B - A kind of have the spin-ended anti-rotating plate structure pressing down and bestirring oneself - Google Patents
A kind of have the spin-ended anti-rotating plate structure pressing down and bestirring oneself Download PDFInfo
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- CN104912604B CN104912604B CN201510292681.8A CN201510292681A CN104912604B CN 104912604 B CN104912604 B CN 104912604B CN 201510292681 A CN201510292681 A CN 201510292681A CN 104912604 B CN104912604 B CN 104912604B
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Abstract
The invention discloses and a kind of have the spin-ended anti-rotating plate structure pressing down and bestirring oneself, it is provided with stator ring in the import upstream of rotatory sealing, and described stator ring inner surface radius is gradually reduced vertically or first reduces and increases afterwards；Described stator ring inner surface and flow deflector, rotary part outer surface constitute the variable cross-section annular fluid passage of axial shrinkage or scaling makes working medium expand acceleration when flowing through this passage.The present invention is directed to turbomachine rotor-support-foundation system to reducing sealing import eddy flow, improving canned rotor dynamic characteristics and improve the requirement of rotor stability, propose a kind of there is the spin-ended anti-rotating plate structure pressing down and bestirring oneself, can effectively reduce sealing import just prewhirling speed, guide seal import working medium reversely rotate, increase the effective damping of rotatory sealing, thus solve rotor oscillation destabilization problems, improve rotor system stability.
Description
Technical field
The invention belongs to impeller machinery technical field, relate to a kind of anti-rotating plate structure, especially a kind of
What turbomachine rotatory sealing import used has spin-ended, water conservancy diversion and presses down the anti-rotating plate structure bestirred oneself.
Background technology
In the turbomachines such as steam turbine, gas turbine, pump and compressor, rotatory sealing is installed
Between rotary part and stationary parts, control by dynamic and static gaps from higher-pressure region letting out to low-pressure area
Leakage current moves, and has turbomachine operational efficiency and interferes significantly on.The most conventional rotatory sealing knot
Structure has labyrinth seal, honeycomb seal, pass sealing, pouch-type damping seal and brush seal, according to
The difference of installation site be otherwise known as sealing, interstage seal, balanced seal, leaf top seal, leaf
Wheel import sealing and bulkhead seal etc..Rotary seal structure is typically by sealing stator part and rotating part
Part two parts form, and there is little radial clearance between the two.
Rotatory sealing, while controlling leakage flow, also can produce time-dependent fluid exciting force, shadow
Ring the stability of rotor-support-foundation system.Research shows that the self-excited vibration sealing Airflow Exciting-Vibration Force induction is to cause
The key factor of turbomachine shaft train instability, and firm by sealing the bigger intersection that import eddy flow causes
Degree is the crucial kinetic parameter that induction rotor loads unstability.Rotor is caused in the face of sealing flow-induced vibration
Destabilization problems, mainly by changing the damping due to rotation seal of advanced person, adjusting sealing in current engineering
Dynamic and static gaps, spin-ended device is installed improves the measures such as inlet flow conditions and solve.
Engineer applied individually uses the damping seal generations such as the sealing of honeycomb seal, pass and pouch-type sealing
Method for tradition labyrinth seal can reduce rotor oscillation amplitude effectively, but has not often reached
The full purpose eliminating rotor oscillation unstability.Research shows: due to the water conservancy diversion of blade grid passage, and axle,
The rotation of the rotary parts such as wheel disc, working medium has the biggest circumferential swirl velocity in sealing import, claims
For sealing inlet whirl；(with sealing surfaces of revolution rotary speed in the same direction) is just prewhirled in sealing import can
Significantly increase sealing intersection rigidity, reduce and seal effective damping；And seal import negative prewhirl (with
Seal surfaces of revolution rotary speed reverse) symbol sealing intersection rigidity can be changed, increase is sealed with
Effect damping.Reduction sealing import is just being prewhirled or is being increased negative prewhirling and can significantly increase rotatory sealing
Effective damping, strengthens the stability of rotor-support-foundation system.At present in experimental study and engineer applied, logical
Cross and efficiently reduce be sealed at honeycomb seal and the pass sealing import installation spin-ended device of anti-rotating plate
Mouth is prewhirled speed, and the rotor metasynchronism successfully solving a lot of hyperbaric oxygen air pump and centrifugal compressor is shaken
Dynamic destabilization problems.Anti-rotating plate structure is mounted in a series of and rotary shaft of sealing import and becomes certain angle
The flow deflector of degree, it is possible to block and guide the spin-ended device of one sealing import Working fluid flow direction.
Fig. 1 gives a kind of labyrinth seal 2 with traditional import anti-rotating plate structure in prior art.Though
Right traditional anti-rotating plate 3 can reduce the swirl velocity sealing import to a certain extent, but effect has
Limit, can not fundamentally improve rotatory sealing rotor dynamic behavior, solves rotor oscillation unstability and asks
Topic.
Therefore, it is possible to effectively eliminate seal import just prewhirling speed, even make sealing import working medium anti-
To the novel anti-rotating plate structure rotated to improving canned rotor dynamic characteristics, improving rotor stability tool
Important engineer applied is had to be worth.
Summary of the invention
The present invention is directed to turbomachine rotor-support-foundation system to reducing sealing import eddy flow, improving canned rotor
Dynamic characteristics and improve the requirement of rotor stability, proposes a kind of have the spin-ended anti-rotation pressing down and bestirring oneself
Plate structure so that it is can effectively reduce sealing import just prewhirling speed, guide seal import working medium
Reversely rotate, increase the effective damping of rotatory sealing, thus solve rotor oscillation destabilization problems, carry
The high rotor stability of a system.
It is an object of the invention to be achieved through the following technical solutions:
This have the spin-ended anti-rotating plate structure bestirred oneself that presses down and be: sets in the import upstream of rotatory sealing
Being equipped with stator ring, described stator ring inner surface radius is gradually reduced vertically or first reduces and increases afterwards；
Described stator ring inner surface constitutes axial shrinkage or the change of scaling with flow deflector, rotary part outer surface
Cross sectional annular fluid passage makes working medium expand acceleration when flowing through this passage.
Further, the seal form of above-mentioned rotatory sealing is that labyrinth seal, honeycomb seal, pass are close
Envelope or pouch-type damping seal.
Further, the axial molded line of the stator ring inner surface of above-mentioned stator ring be " straight line shrinkage type ",
" conic section shrinkage type ", " cosine curve shrinkage type " or " B-spline curves scaling type ".
Further, the edge, circular passage that the outer surface of above-mentioned stator ring inner surface and rotary part is formed
Flow direction has " contraction " or " scaling " type flow area.
Further, between above-mentioned flow deflector and the outer surface of rotary part, there is radial clearance, described
Radial clearance has the value close with the seal clearance of rotatory sealing.
Above-mentioned flow deflector is the thin slice of equal thickness, and two ends have rounding；Described flow deflector molded line is by it
Mean camber line determines, described mean camber line is " linear pattern " or " L-type ".
0 °～the deflection angle of 90 ° is there is in the mean camber line of above-mentioned flow deflector with the rotary shaft of rotary part.
Above-mentioned flow deflector axial length is less than the axialmode line axial length of the inner surface of stator ring；Lead
The upstream axial length of flow is less than or equal to axial length downstream.
The method have the advantages that
The present invention has the spin-ended novel anti-rotating plate structure pressing down and bestirring oneself, and can effectively reduce rotation
Seal import just prewhirling speed, increase negative speed of prewhirling, increase rotatory sealing effective damping significantly,
Improve canned rotor dynamic characteristics, improve rotor system stability.The anti-rotating plate structure pair of the present invention
In turbomachine, all kinds of rotary seal structures of application have general applicability at present.
Accompanying drawing explanation
Fig. 1 is the labyrinth seal in prior art with anti-rotating plate structure；
Fig. 2 is relative in multi-stage centrifugal compressor of anti-rotating plate structure and the rotatory sealing of the present invention
Coordinate installation site schematic diagram；
Fig. 3 is anti-rotating plate and the pass sealing tomograph of the present invention；
Fig. 4 is the meridian plane sectional view of the anti-rotating plate of the present invention；
Fig. 5 is the meridian plane sectional view of the anti-rotating plate stator ring of the present invention；
Fig. 6 is meridian plane sectional view and several molded line of inner surface of the anti-rotating plate stator ring of the present invention
Generation method；
Fig. 7 is that the anti-rotating plate flow deflector of the present invention is along line A-A sectional view and two kinds of molded line of mean camber line
Generation method；
Wherein: 1 is rotary part；2 is rotatory sealing；3 is anti-rotating plate；4 is impeller；5 are
Flow deflector；6 is stator ring inner surface；7 is stator ring；8 is the outer surface of rotary part；9 are
Radial clearance；10 is stator ring axial length；11 is stator ring radial height；12 is flow deflector
Mean camber line；13 is flow deflector thickness；14 is flow deflector axial overall length；15 is water conservancy diversion bobbin
To deflection angle；16 is upstream axial length；17 is downstream axial length.
Detailed description of the invention
Below in conjunction with the accompanying drawings the present invention is described in further detail:
The concrete structure of the present invention sees accompanying drawing 2～7: the present invention has and spin-ended presses down bestir oneself anti-
Rotating plate structure, it is characterised in that the import upstream of rotatory sealing 2 is provided with stator ring 7, institute
State stator ring 7 inner surface radius to be gradually reduced vertically or first reduce and increase afterwards；Described stator ring 7
Inner surface constitutes axial shrinkage or the variable cross-section ring of scaling with flow deflector 5, rotary part 1 outer surface
Shape fluid passage makes working medium expand acceleration when flowing through this passage.
The seal form of described rotatory sealing 2 be labyrinth seal, honeycomb seal, pass seal or
Pouch-type damping seal.The axial molded line of the stator ring inner surface 6 of described stator ring 7 is that " straight line is received
Miniature ", " conic section shrinkage type ", " cosine curve shrinkage type " or " B-spline curves
Scaling type ".The circular passage that the outer surface 8 of described stator ring inner surface 6 and rotary part is formed
Streamwise has " contraction " or " scaling " type flow area.Described flow deflector 5 and rotation
There is radial clearance 9 between the outer surface 8 of parts, described radial clearance 9 has and rotatory sealing 2
The close value of seal clearance.Described flow deflector 5 is the thin slice of equal thickness, and two ends have rounding；
Described flow deflector 5 molded line is determined by its mean camber line 12, described mean camber line 12 be " linear pattern " or
" L-type ".The mean camber line 12 of described flow deflector 5 exists 0 °～90 ° with the rotary shaft of rotary part 1
Deflection angle.Described flow deflector 5 axial length is less than the axialmode bobbin of the inner surface 6 of stator ring
To length 10；The upstream axial length 16 of " L-type " flow deflector 5 is less than or equal to the most axial
Length 17.
Seeing Fig. 2, in figure, 4 is impeller, and the anti-rotating plate structure 3 of the present invention is independent parts,
Can be directly mounted at the import upstream of rotatory sealing 2, be co-axially mounted with rotatory sealing 2.The present invention
Anti-rotating plate structure 3 can improve the rotor dynamic behavior of rotatory sealing 2, strengthen rotor-support-foundation system stable
Property, and do not change the structure of rotatory sealing 2.
Participate in Fig. 3, the flow deflector 5 of the anti-rotating plate 3 of the present invention and the outer surface 8 of rotary part 1
There is radial clearance 9.The numerical value of radial clearance 9 is equal with rotatory sealing radial clearance or close.
Seeing Fig. 3, the anti-rotating plate structure 3 of the present invention includes stator ring 7 and flow deflector 5.Stator ring
7 and flow deflector 5 use separately machined after assemble processing method.For ease of installing, stator ring 7
It is processed as waiting the 2-6 block of radian.
Seeing Fig. 4, the radius of the inner surface 6 of stator ring 7 is change vertically, i.e. inner surface 6
And the flow area of the circular passage formed between the outer surface 8 of rotary part 1 is change vertically
's.Circular passage area between inner surface 6 and the outer surface 8 of rotor part 1 of stator ring 7
Streamwise has " contraction " and " scaling " two kinds of Changing Patterns.
Seeing Fig. 5 (a) and (b), the molded line of the inner surface 6 of stator ring 7 is by two parameter axles
To length L10 and radial height H11, and radius change rule determines.Axial length L 10 He
The value of radial height H11 is relevant with the installation dimension of anti-rotating plate and rotatory sealing.
Seeing Fig. 6, in Fig. 6, L and H is the axial length 10 of the molded line of stator ring 7 inner surface 6
With radial height 11, RinFor the radius at inner surface 6 upstream inlet, Z is the molded line of inner surface 6
The axial coordinate of upper coordinate points.The molded line of the inner surface 6 of stator ring 7 is according to radius change rule
Difference can be divided into: " straight line shrinkage type ", " conic section shrinkage type ", and " cosine curve shrinks
Type " and " B-spline curves scaling type ".Five kinds of " shrinkage type " molded line can be according to anti-rotating plate 3 He
The concrete installation dimension of rotatory sealing 2 and operating condition determine axial length L 10 and radial height
H11, then obtains according to the computing formula shown in Fig. 6." B-spline curves scaling type " molded line
In addition to need to determining axial length L and radial direction height two parameters of H, also need to use optimized algorithm sum
Value simulation, by being optimized acquisition to limited control point coordinate.
Seeing Fig. 7, the flow deflector 5 of the anti-rotating plate 3 of the present invention has two kinds of molded line: " straight line
Type " and " L-type ".Flow deflector 5 uses the thin slice of equal thickness, its two ends processing rounding.Water conservancy diversion
The molded line of sheet 5 is determined by its mean camber line 12." linear pattern " molded line geometric parameter includes: mean camber line
With flow deflector axial deflection angle 15, flow deflector axial overall length 14, flow deflector thickness 13.“L
Type " molded line includes: mean camber line and axis deflection angle 15a, 15b, flow deflector axial overall length
14, the upstream axial length 16 of " L-type " flow deflector 5, the downstream shaft of " L-type " flow deflector 5
To length 17, flow deflector thickness 13, deflect arc radius 18.As shown in Figure 4 and Figure 6, lead
The axial overall length 14 of flow 5 is slightly less than the axial long of stator ring inner surface 6 molded line of anti-rotating plate 3
Degree 10L1<L.Flow deflector axial deflection angle 15, the span of 15a, 15b are
0 °～90 ° of 0 °≤α, α1,α2<90°.The value of deflection angle 15b and rotatory sealing import working fluid direction
Relevant, flow deflector axial deflection angle 15,15b should be equal with inlet air flow deflection angle.Axial length
The value of 16 is less than or equal to value L of downstream axial length 172<L3.The value of deflection arc radius 18 is with inclined
Corner 15a, 15b, and the number of flow deflector 5 is relevant.The number of flow deflector 5 is desirable
36,72 ... wait the multiple of 4, stator ring 7 circumferentially waits radian install.Flow deflector 5
Radial height by the radius of inner surface 6 of stator ring 7, the radius of rotary part 1 outer surface 8
Determine with radial clearance 9.
The know-why of the present invention is as follows:
See Fig. 2, in turbomachine, due to rotary part 1 such as rotor, impeller, wheel disc etc.
Rotation and the effect such as deflection of blade grid passage, the working medium entering rotatory sealing 2 has and rotation
The circumferential swirl velocity that rotation member direction of rotation is identical, the most positive inlet whirl speed.Research table
Bright: positive inlet whirl speed can increase the intersection rigidity of rotatory sealing, reduce effective damping, make to turn
There is vibration unstability in son；By reducing the speed of just prewhirling of sealing import, increasing speed of reversely prewhirling
The effective damping of rotatory sealing can be increased, strengthen the stability of rotor-support-foundation system.The anti-rotating plate of the present invention
Structure 3 is the positive deflection being sealed import working fluid by retardance, and guides working medium the most inclined
Turn, thus reduce speed of just prewhirling, increase negative speed of prewhirling, reach to improve rotatory sealing rotor and move
Force characteristic, the purpose of enhancing rotor stability.
The anti-rotating plate 3 of the present invention, by controlling the axial molded line of inner surface 6, makes the interior of stator ring 7
Between surface 6 and the outer surface 8 of rotary part 1 formed circular passage axially have similar
The flow area Changing Pattern of " shrink nozzle " or " de Laval noz(zle) ".Working medium flows through anti-rotating plate 3
Time, pressure reduces, and speed increases.Simultaneously because the rotary shaft of flow deflector 5 and rotary part 1 is deposited
In certain deflection angle 15, have retardance working medium just prewhirling speed, guide fluid to reversely rotate
Effect, after working medium expands acceleration in anti-rotating plate 3, its axial velocity and reverse rotation speed will be aobvious
Write and increase, reach to improve the purpose of rotatory sealing rotor dynamic behavior.
The anti-rotating plate structure 3 of the numerical simulation result preliminary proof present invention can efficiently control
The speed of prewhirling of rotatory sealing 2 import, it is possible to significantly increase the effective damping of sealing.
Claims (7)
1. an anti-rotating plate structure, it is characterised in that arrange in the import upstream of rotatory sealing (2)
After having stator ring (7), described stator ring (7) inner surface radius to be gradually reduced vertically or first reducing
Increase；Described stator ring (7) inner surface is constituted with flow deflector (5), rotary part (1) outer surface
The variable cross-section annular fluid passage of axial shrinkage or scaling makes working medium expand acceleration when flowing through this passage；Institute
Stating the thin slice that flow deflector (5) is equal thickness, two ends have rounding；Described flow deflector (5) molded line by
Its mean camber line (12) determines, described mean camber line (12) is " linear pattern " or " L-type ".
Anti-rotating plate structure the most according to claim 1, it is characterised in that described rotatory sealing (2)
Seal form be labyrinth seal, honeycomb seal, pass seal or pouch-type damping seal.
Anti-rotating plate structure the most according to claim 1, it is characterised in that described stator ring (7)
The axial molded line of stator ring inner surface (6) be " straight line shrinkage type ", " conic section shrinkage type ",
" cosine curve shrinkage type " or " B-spline curves scaling type ".
4. according to the anti-rotating plate structure described in claim 1 or 3, it is characterised in that described stator ring
The circular passage streamwise that the outer surface (8) of inner surface (6) and rotary part is formed has " to be received
Contracting " or " scaling " type flow area.
Anti-rotating plate structure the most according to claim 1, it is characterised in that described flow deflector (5)
And there is radial clearance (9) between the outer surface (8) of rotary part, described radial clearance (9) has
There is the value close with the seal clearance of rotatory sealing (2).
Anti-rotating plate structure the most according to claim 1, it is characterised in that described flow deflector (5)
The rotary shaft of mean camber line (12) and rotary part (1) there is 0 °～the deflection angle of 90 °.
7. according to the anti-rotating plate structure described in claim 1 or 3, it is characterised in that described flow deflector
(5) axial length is less than axialmode line axial length (10) of the inner surface (6) of stator ring；Lead
The upstream axial length (16) of flow (5) is less than or equal to axial length (17) downstream.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510292681.8A CN104912604B (en) | 2015-06-01 | 2015-06-01 | A kind of have the spin-ended anti-rotating plate structure pressing down and bestirring oneself |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510292681.8A CN104912604B (en) | 2015-06-01 | 2015-06-01 | A kind of have the spin-ended anti-rotating plate structure pressing down and bestirring oneself |
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| Publication Number | Publication Date |
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| CN104912604A CN104912604A (en) | 2015-09-16 |
| CN104912604B true CN104912604B (en) | 2016-08-24 |
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|---|---|---|---|
| CN201510292681.8A Active CN104912604B (en) | 2015-06-01 | 2015-06-01 | A kind of have the spin-ended anti-rotating plate structure pressing down and bestirring oneself |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108708771A (en) * | 2018-04-28 | 2018-10-26 | 北京航天动力研究所 | A kind of high-molecular organic material dynamic sealing device for cryogenic turbo |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106949245B (en) * | 2017-03-07 | 2018-04-17 | 西安交通大学 | It is a kind of from spin-ended convergence type rotary seal structure |
| JP6846374B2 (en) * | 2018-03-08 | 2021-03-24 | 三菱重工業株式会社 | Moving wing side sealing device, stationary wing side sealing device and rotating machine |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE533093A (en) * | 1953-11-12 | 1954-11-30 | ||
| US2916332A (en) * | 1958-09-08 | 1959-12-08 | Vladimir H Pavlecka | Aerostatic bearings with fluid-dynamic seals |
| EP0982475A1 (en) * | 1998-08-28 | 2000-03-01 | Asea Brown Boveri AG | Axial flow turbomachine with shrouded blading |
| US8807927B2 (en) * | 2011-09-29 | 2014-08-19 | General Electric Company | Clearance flow control assembly having rail member |
| US9109448B2 (en) * | 2012-03-23 | 2015-08-18 | Pratt & Whitney Canada Corp. | Grommet for gas turbine vane |
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2015
- 2015-06-01 CN CN201510292681.8A patent/CN104912604B/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108708771A (en) * | 2018-04-28 | 2018-10-26 | 北京航天动力研究所 | A kind of high-molecular organic material dynamic sealing device for cryogenic turbo |
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| CN104912604A (en) | 2015-09-16 |
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