CN207246417U - A kind of gap adaptively adjusts sealing structure - Google Patents
A kind of gap adaptively adjusts sealing structure Download PDFInfo
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- CN207246417U CN207246417U CN201721037553.XU CN201721037553U CN207246417U CN 207246417 U CN207246417 U CN 207246417U CN 201721037553 U CN201721037553 U CN 201721037553U CN 207246417 U CN207246417 U CN 207246417U
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- sealing
- sealing block
- circular cone
- cone slope
- mounting groove
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Abstract
The utility model discloses a kind of gap adaptively to adjust sealing structure, including the sealing block some sections by circumferential spring connection cyclization, sealing block is inlaid in the sealing block mounting groove of stator, the inner ring of sealing block is equipped with some circles and seals tooth vertically, the excircle that rotor coordinates with sealing tooth sets circular cone slope, circular cone slope rotates sub- outer circumferential into a circular conical surface, seals tooth and is set along the direction parallel to circular cone slope；Sealing block is positioned in sealing block mounting groove by axial arranged axle spring, and axial yielding space is equipped between sealing block and sealing block mounting groove.The sealing structure of the utility model can adaptively adjust seal clearance with the increase of sealing upstream and downstream pressure difference, during the adjustment, sealing block enough (fluid flow direction) vertically acts, it is engaged with rotor surface ramp structure, reduction seal clearance is played, finally significantly reduces the effect of leakage rate.
Description
Technical field
The utility model belongs to sealing structure, and in particular to the sealing structure used in a kind of rotating machinery, more particularly to
It is a kind of being capable of gap is gradually reduced adaptive adjustment sealing structure, this kind sealing with the increase of sealing upstream and downstream fluid pressure difference
Structure can significantly reduce the leakage rate of sealing in rotating machinery (such as steam turbine, compressor), improve efficiency of energy utilization.
Background technology
The sealing used in rotating machinery is leaked by increasing the resistance that fluid flows to achieve the purpose that to reduce fluid.Its
Thinking is that a series of non-contacting throttle clearances and eddy chamber are arranged on the passage that fluid flows through, when fluid flows through sealing tooth
During the slype formed with corresponding rotor surface, continuously throttled, and be progressively depressured and expand acceleration, fluid is being vortexed
By rotating and rubbing in chamber, the fluid dynamic energy with high speed is dissipated by turbulent vortices becomes thermal energy, and by fluid
Absorb, fluid specific volume increase, so as to get the initial velocity up to next gap entrance diminishes.For multiple tooth sealing, tooth is each sealed
Front and rear differential pressure step by step reduces, and flows through that the flow velocity of each sealing tooth is lower, then the specific volume of gas gradually increases, so that sealing
Air leakage greatly reduces, and has the function that sealing.
For a long time, the synergy of rotating machinery interior sealing is always the emphasis of researcher's concern.Increase both at home and abroad for sealing
The research of effect is concentrated mainly on the following aspects：Turbulent flow increases resistance, blade tip or air cylinder structure Curve guide impeller and reduces seal clearance.
It is most directly most effective reduction sealing leak amount wherein to reduce seal clearance, improves the measure of leakage efficiency, brush seal with
And the finger tip occurred later and leaf seal etc. are Typical Representatives therein.This type seal is that sealing tooth is tied using flexible
Structure, limited can make a concession when being contacted with rotor, although this kind of sealing sealing effect is good, due to gap very little, even
Negative clearance, the friction between sealing and rotatable parts can hardly be avoided, still can cause significantly to vibrate when serious, and make for a long time
Used time, since abrasion occurs in contact portion, often leads to gap-ratio and starts to want big during installation, sealing effect will have a greatly reduced quality.
Solve leakage wearability between contradiction another thinking be seal clearance is designed to it is adjustable.Specific practice is
By seal clearance measured directly or monitoring acoustic emission signal, temperature signal etc., pass through piezo-electric crystal, compressed air, liquid
Pressure oil, electromagnet etc. apply feedback force to change the dynamic and static gaps of sealing.This seal style is designed with Bu Laideng companies of the U.S.
A kind of adjustable sealing be representative, the planar spring at conventional seals ring back is substituted for helical spring by Bu Laideng sealings, and is allowed
The fluid of sealing upstream directly acts on the sealing ring back side, sealing is reached closed position, keeps sealing radial clearance setting value.
It is complicated that Bu Laideng seals this adjustable sealing, it is desirable to is sealed in expansion and contraction that radially can be freely, seal is towards footpath
To when shrinking, certainly will needing to reserve certain constringency cleft between two adjacent seals, gap be easy to cause greatly very much leakage rate increasing
Greatly, gap too it is small easily due to it is dirty occur sealing block shrink bite be obstructed, so reliability is not high during practical application, introduce me
After state, all there is the failure of seal clearance imbalance in many units.
Utility model content
The utility model solve technical problem be：For lacking for the easy gap imbalance of existing Bu Laideng sealing structures
Fall into, there is provided it is a kind of can with the increase of sealing upstream and downstream pressure difference gap is gradually reduced adaptive adjustment sealing structure, the type
During seal operation, direction of action is different from the radial contraction movement of Conventional tunable sealing, but vertically (fluid flow direction)
Action, and be engaged with the ramped processing of rotor surface, reduction seal clearance is played, finally significantly reduces the effect of leakage rate.
The utility model specifically adopts the following technical scheme that realization：
Gap adaptively adjusts sealing structure, including some sections of sealing blocks 2 that cyclization is connected by circumferential spring 5, described close
Envelope block 2 is inlaid in the sealing block mounting groove 11 of stator 1, and the inner ring of the sealing block 2 is equipped with some circles and seals tooth 21 vertically,
The excircle that the rotor 4 coordinates with sealing tooth 21 sets circular cone slope 41, the circular cone slope 41 around rotor outer circumferential into
One circular conical surface, the sealing tooth 21 are set along the direction parallel to circular cone slope；The sealing block 2 passes through axial arranged axis
It is positioned to spring 3 in sealing block mounting groove 11, axial yielding space is equipped between the sealing block 2 and sealing block mounting groove 11
12。
Further, the circular cone slope 41 low side close to sealing fluid upstream, the circular cone slope 41 it is high-end
Close to the downstream of sealing fluid.
Further, the compression of axle spring 3 is arranged at sealing block 2 close to the high-end side in circular cone slope and sealing block
Between mounting groove 11.
Preferably, the axle spring 3 uses helical spring.
In adaptively adjusting sealing structure in the gap of the utility model, the circular cone slope 41 adds for cylindrical rotor surface
The circular conical surface of work, or using one section in the rotor of overall conical structure.
Preferably, the angle of inclination on the circular cone slope 41 is 5~10 °.
Compared with prior art, the utility model proposes gap adaptively adjust sealing structure have it is following beneficial to effect
Fruit：
(1) the utility model proposes sealing structure by installing axle spring in sealing block side, and in sealing block
Mounting groove and with sealing block axially reserved certain yielding space, and being engaged with the circular cone slope of rotor, sealing can be made
Block reaches adaptive under the action of upstream and downstream fluid pressure difference and side axial spring force between rotor and stator together with sealing tooth
Reduce seal clearance, reduce the purpose of sealing leak amount.
(2) the utility model proposes sealing structure rotor surface have passed through ramped processing, in the sealing tooth of sealing block
Touched with rotor surface when rubbing, touching the axial thrust load for power of rubbing can make sealing produce the automatic yielding away from rotor ramped surfaces,
Avoid touching the acute caused sealing odontotripsis of mocha；
(3) the utility model proposes the type sealing structure it is simple, it is easily fabricated, at present scene using most of sealings all
Can be by changing sealing structure and the ramped seal style for handling more easily improving cost utility model of rotor surface.
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Brief description of the drawings
Fig. 1 adaptively adjusts the assembling schematic diagram of sealing structure for the gap in embodiment.
Fig. 2 adaptively adjusts the motion principle figure of sealing structure for the gap in embodiment.
Fig. 3 adaptively adjusts the force analysis figure of sealing structure for the gap in embodiment.
Figure label：1- stators, 11- sealing block mounting grooves, 12- axially make a concession space, 2- sealing blocks, 21- sealing teeth, 3-
Axle spring, 4- rotors, 41- circular cones slope, 5- circumferential direction springs.
Embodiment
Embodiment
Referring to Fig. 1, it is illustrated that in gap adaptively adjust sealing structure be the utility model preferred solution, the sealing knot
Structure is installed on the stator 1 at the needs sealing such as rotating machinery shaft end or leaf top, is engaged with rotor 4 and is played sealing function.
Specifically, sealing structure includes sealing block 2 and the axle spring 3 for being arranged on sealing block side, sealing block 2 use
Comb tooth sealing structure, annulus is connected into by some sections of circumferential springs 5 by the sealing block 2 of arc section, and sealing block 2 is inlaid in and is determined
In the sealing block mounting groove 11 that sub 1 inner wall is set, the sealing tooth 21 contacted with rotor outer circle perimeter surface is equipped with sealing block 2,
All sealing blocks 2 are enclosed along the circumferential installation one of stator 1, are attached between adjacent seals block by circumferential spring 5, and ensure
Certain radial direction clamp force, circumferential spring 5 can ensure that sealing block 2 is set in the elasticity of radial direction, enable sealing block in footpath
To possessing certain elastic allowance, when rubbing occurs, the gap between sealing tooth 21 and the rotor 4 on sealing block is realized
Adjustment.
In the present embodiment, rotor 4 sets circular cone slope 41 with the excircle that sealing tooth 21 contacts, and circular cone slope 41 rotates
Sub- outer circumferential into a continuous circular conical surface, in axial direction arrange by some circles, corresponding, some circle sealings by sealing tooth 21
Tooth 21 is along the direction setting parallel to circular cone slope, i.e. the tip line of sealing tooth 21 is parallel with circular cone slope, in sealing block axis
To when movement, it can ensure that all sealing teeth 21 are consistent with circular cone slope gap.
In practical applications, circular cone slope 41 can be the circular conical surface that cylindrical rotor surface processes, or using whole
One section in the rotor of body conical structure.
Sealing block 2 is assemblied in sealing block mounting groove 11 by the axial arranged positioning of axle spring 3, sealing block 2 and close
Seal between block mounting groove 11 and make a concession space 12 equipped with axial.In the present embodiment, the low side on circular cone slope 41 is close to sealing fluid
Upstream set, circular cone slope 41 it is high-end close to sealing fluid downstream set, by axle spring 3 compression be arranged at sealing block
2 between the high-end side in circular cone slope and sealing block mounting groove 11, and axle spring 3 uses helical spring, and one end is fixed embedding
In the sealing block mounting groove of stator, other end compression and the end contact of sealing block 2,2 axial compression of sealing block is positioned
In sealing block mounting groove, under the thrust of no sealing fluid, ensure the sealing tooth 21 on sealing block 2 away from cone inclined
Slope 41, the spacing sealed at this time between tooth 21 and circular cone slope are maximum.
The axle spring 3 of the present embodiment is the spring of compression, and certain axial pre tightening force is maintained to sealing block 2 after installation,
When operating, 2 upstream and downstream fluid pressure difference of sealing block effect can overcome the axial pre tightening force, axle spring 3 is further compressed, axis
Become larger to the elastic force of spring 3, and finally balance each other with the axial flow of fluid pressure suffered by sealing block 2, during this, sealing block 2
When axial make a concession occurring under the pressure of fluid, the circular cone inclined-plane 41 on rotor 4 can reduce therewith with sealing the gap of tooth 21, play
Reduce the purpose of leakage rate.
In general, sealing structure at work, the upstream pressure P of sealing structureupThe pressure P in downstream can be more thandown, such as
Shown in Fig. 1, if sealing block is unfixed in the flowing direction, under the action of upstream and downstream pressure difference, it will certainly produce along axis
Displacement to (flow direction), if this displacement vertically coordinates the technical solution of the utility model, rotor surface into
The ramped processing of row, can play the role of reducing seal clearance.
As shown in Fig. 2, dotted line represents the position before sealing block movement, solid line represents the position after sealing block movement.h1For
When sealing is not moved, the gap between tooth 21 and rotor surface circular cone slope 41 is sealed；h2To be sealed in upstream and downstream pressure difference
After being moved under effect, sealing tooth 21 and the gap on rotor surface circular cone slope 41；θ is the surface gradient on circular cone slope 41
Angle；L is that sealing block 2 occurs to make a concession mobile horizontal displacement under upstream and downstream differential pressure action.It can show that sealing block 2 is made in pressure difference
During with lower moving axially, the expression formula of gap variation delta h：
Δ h=h1-h2=Lsin θ
It can be obtained after sealing block makes a concession by above formula, sealing tooth 21 and the gap on rotor surface circular cone slope 41 are expressed
Formula：
h2=h1-L·sinθ
In actual work, after sealing block moves axially under differential pressure action, seal clearance h2Depending on sealing block
The mobile displacement L and surface gradient angle θ on rotor surface circular cone slope, during practical application, can make a concession water by adjusting sealing
Flat distance L and rotor and the angle of gradient θ on sealing matching surface circular cone slope reach the size of perfect match.
The utility model proposes adjustable sealing pattern can also effectively avoid because gap reduce and caused by seal tooth with turn
The influence to rub is touched in sublist face, and concrete analysis is as follows：
As shown in Fig. 3 seal force analysis figures, it is assumed that seal is subject to upstream fluid differential pressure action in the operating condition
Under fluid make a concerted effort beThe elastic force of axle spring (compression spring) isWhen reaching stable, this pair of of power reaches equilibrium-like
State, seals tooth 21 and keeps certain value with 41 gap of rotor surface circular cone slope at this time.When sealing tooth 21 and rotor surface cone inclined
Slope 41 is touched when rubbing, it is assumed that the power of rubbing of touching suffered by sealing tooth 21 isThe force direction is perpendicular to rotor surface circular cone slope 41
Direction, due to the angle of gradient θ on rotor surface circular cone slope, touches power of rubbingRadial load can be decomposed intoAnd axial forceRadially
PowerBalanced with sealing back side radial constraint (circumferential spring offer), and axial forceIt can cause sealing block that adverse current body occurs
The movement tendency of flow direction, this athletic meeting to seal tooth away from rotor surface circular cone slope, thus avoid touching it is rubbing plus
It is acute, that is to say, that when sealing tooth is touched with rotor surface to rub, the sealing that the utility model is proposed can eliminate in yielding automatically
Touch and rub.
Embodiment above describes the utility model basic principle and main feature and the utility model the advantages of, one's own profession
The technical staff of industry is it should be appreciated that the present utility model is not limited to the above embodiments, described in above embodiments and description
Simply illustrate the utility model concrete operating principle, on the premise of not departing from the spirit and scope of the utility model, this reality
Various changes and modifications are also had with new, these various changes and improvements fall within the scope of the claimed invention, this
Utility model is claimed scope and is defined by the appending claims and its equivalent thereof.
Claims (6)
1. a kind of gap adaptively adjusts sealing structure, including some sections of sealing blocks (2) that cyclization is connected by circumferential spring (5),
The sealing block (2) is inlaid in the sealing block mounting groove (11) of stator (1), and the inner ring of the sealing block (2) is equipped with vertically
Some circle sealing teeth (21), it is characterised in that：
Rotor (4) sets circular cone slope (41) with the excircle that sealing tooth (21) coordinates, and the circular cone slope (41) is outside rotor
Circumference forms a circular conical surface, and the sealing tooth (21) is set along the direction parallel to circular cone slope；
The sealing block (2) is positioned in sealing block mounting groove (11) by axial arranged axle spring (3), the sealing block
(2) axial yielding space (12) is equipped between sealing block mounting groove (11).
2. a kind of gap according to claim 1 adaptively adjusts sealing structure, the low side of the circular cone slope (41) leans on
The upstream of nearly sealing fluid, the downstream of the high-end close sealing fluid of the circular cone slope (41).
3. a kind of gap according to claim 2 adaptively adjusts sealing structure, axle spring (3) compression is arranged at
Sealing block (2) is close between the high-end side in circular cone slope and sealing block mounting groove (11).
4. a kind of gap according to claim 1 adaptively adjusts sealing structure, the axle spring (3) uses spiral bullet
Spring.
5. a kind of gap according to any one of claim 1-3 adaptively adjusts sealing structure, the circular cone slope
(41) it is the circular conical surface of cylindrical rotor surface processing, or using one section in the rotor of overall conical structure.
6. a kind of gap according to claim 4 adaptively adjusts sealing structure, the inclination angle of the circular cone slope (41)
Spend for 5~10 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721037553.XU CN207246417U (en) | 2017-08-18 | 2017-08-18 | A kind of gap adaptively adjusts sealing structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721037553.XU CN207246417U (en) | 2017-08-18 | 2017-08-18 | A kind of gap adaptively adjusts sealing structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207246417U true CN207246417U (en) | 2018-04-17 |
Family
ID=61881686
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721037553.XU Withdrawn - After Issue CN207246417U (en) | 2017-08-18 | 2017-08-18 | A kind of gap adaptively adjusts sealing structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207246417U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107355540A (en) * | 2017-08-18 | 2017-11-17 | 国网湖南省电力公司 | Gap adaptively adjusts sealing structure |
-
2017
- 2017-08-18 CN CN201721037553.XU patent/CN207246417U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107355540A (en) * | 2017-08-18 | 2017-11-17 | 国网湖南省电力公司 | Gap adaptively adjusts sealing structure |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20180417 Effective date of abandoning: 20230714 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20180417 Effective date of abandoning: 20230714 |