CN110296218A - A kind of screen sealing structure that screen stacking clearance self-regulating is whole - Google Patents
A kind of screen sealing structure that screen stacking clearance self-regulating is whole Download PDFInfo
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- CN110296218A CN110296218A CN201910589750.XA CN201910589750A CN110296218A CN 110296218 A CN110296218 A CN 110296218A CN 201910589750 A CN201910589750 A CN 201910589750A CN 110296218 A CN110296218 A CN 110296218A
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- Prior art keywords
- screen
- sealing structure
- thickness
- clearance self
- whole
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Classifications
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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
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/40—Sealings between relatively-moving surfaces by means of fluid
Abstract
A kind of screen sealing structure that screen stacking clearance self-regulating is whole, including screen, the recessed step for being machined with micron dimension thickness on one side of screen, multiple machined surfaces are mounted in mounting groove towards consistent screen stacking, the screen sealing structure of non-equal thickness air film is formed, and step is close to screen sealing structure high-pressure side.The air film with step-thickness is formed between screen, since hydrostatic pressure effect acts on, which has certain rigidity, to adjust grid inter-plate gap, distribute gap automatic uniform, and equally distributed gap has the smallest leakage rate.Therefore, the present invention has is greatly reduced leakage rate and the anti-ability axially disturbed under identical operating temperature span.
Description
Technical field
The invention belongs to screen technical field of sealing technology, in particular to a kind of screen stacks the whole screen of clearance self-regulating and seals knot
Structure.
Background technique
According to existing literature [Jeffrey J.DeMange, Patrick H.Dunlap, Bruce M.Steinetz, Gary
J.Drlik and Analex Corporation,“An Evaluation of High Temperature Airframe
Seals for Advanced Hypersonic Vehicles,”NASA/TM—2007-215043,AIAA–2007–5743,
October 2007】、【Bruce M.Steinetz,”High Temperature Performance Evaluation of a
Hypersonic Engine Ceramic Wafer seal ", NASA-TM-103737, N91-22567], screen sealing structure
A kind of linear type for flow-passage-changeable is slidingly sealed.In the prior art, screen is formed by using the hexahedral shape of rule
Air film is equal thickness air film, is derived according to the Reynolds equation of compressible fluid, and pressure distribution is unrelated with air-film thickness, i.e. air film
There is no rigidity, therefore in temperature change or when by axial disturbance, the gap between screen increases and can not voluntarily adjust,
Gap causes leakage rate sharply to increase between concentrating on a or two place's screen, and it is narrow that there are operating temperature ranges, and Ability of Resisting Disturbance difference is asked
Topic.
Summary of the invention
In order to overcome the disadvantages of the above prior art, increase screen sealing structure temperature working range and Ability of Resisting Disturbance,
Enhance its adaptability, the purpose of the present invention is to provide a kind of screens to stack the whole screen sealing structure of clearance self-regulating, can make
Air film generates rigidity, and can be generated when local gap changes between screen and realize evenly distributing for gap automatically, thus preferably
The big operating condition of adaptive temperature span.
To achieve the goals above, the technical solution adopted by the present invention is that:
A kind of screen sealing structure that screen stacking clearance self-regulating is whole, including screen 1, screen 1 are machined with micron on one side
The recessed step 2 of magnitude thickness, multiple machined surfaces are mounted in mounting groove 3 towards consistent screen 1 stacking, form non-uniform thickness
Spend the screen sealing structure of air film.
When 1 two sides air-film thickness of screen is inconsistent, two sides air film power is inconsistent, and screen 1 can be transported under the effect of air film power
It is dynamic, reach two air films unanimously, achievees the effect that automatic uniform screen gap.
Preferably, the step 2 is close to the high-pressure side of screen sealing structure, the screen 1 with a thickness of the left side 1~15mm
The right side, the thickness deltat h of step 2 are 1~100 μm, and the area of step 2 accounts for the 0.1~0.8 of the 1 single side gross area of screen, so that in screen
Between formed have step-thickness air film, due to hydrostatic pressure effect act on, the air film have certain rigidity, i.e., between screen
When gap air-film thickness increases, air film power reduces, and adjusts grid inter-plate gap to play, the work for distributing gap automatic uniform
With.
Preferably, the screen 1 is mounted in mounting groove 3 by elastic element 4 and the stacking of bridging element 5, jackshaft
The side that element 5 is set to the screen 1 of stacking is connect, elastic element 4 is set between bridging element 5 and mounting groove 3.
Preferably, the screen 1 is not connected with bridging element 5 and mounting groove 3, is not connected mutually between screen 1, screen
1 keeps certain contact with side wall 6 under the collective effect of 4 load of elastic element and frictional force.
Preferably, the mounting groove 3 is inverted U-channel, and elastic element 4 is set between slot bottom and bridging element 5, stacking
The both ends of the surface of screen 1 are contacted with two vertical inner walls of slot, and side wall 6 is arranged in below the aperture position of inverted U-channel.
Preferably, the screen 1 can choose the shapes such as polygon, the polygon with curl, arc along the perspective plane of thickness
Shape, seamed edge structure can choose band fillet, chamfering and keep sharp edge.
Preferably, 2 shape of step may be selected triangle, rectangle, other polygons and circle, ellipse, hyperbola and
The diversified forms such as spline curve, step may be selected single-stage or multistage pattern, the transition style between step may be selected right angle, inclined-plane,
The forms such as arc carry out any combination on this basis.
Compared with prior art, the beneficial effects of the present invention are:
1, reduce the air film power acted on screen as air-film thickness increases, it is thick to reach balance screen two sides air film
The effect of degree.
2, when being disturbed, have and automatically keep the smallest trend of leakage rate.
Detailed description of the invention
Fig. 1 is the self-adjusting screen sealed structural schematic diagram of the present invention.
Fig. 2 is the screen schematic shapes of other organizational forms, and wherein a is conventionally form, and b, c are different screen shapes,
D, e, f, g are different step shapes, and h, i are different interim forms, and j, k are combination examples.
Fig. 3 is the effect picture of embodiment 1.
Fig. 4 is the working forms schematic diagram of embodiment 2.
Specific embodiment
The embodiment that the present invention will be described in detail with reference to the accompanying drawings and examples.
A kind of screen of the present invention stacks the whole screen sealing structure of clearance self-regulating, with reference to Fig. 1, including screen 1, in screen 1
The recessed step 2 for being machined with micron dimension thickness on one side, multiple machined surfaces towards consistent screen 1 stacking be mounted on installation
In slot 3, the screen sealing structure of non-equal thickness air film is formed, wherein step 2 is close to screen sealing structure high-pressure side.In screen 1
Between formed have step-thickness air film, due to hydrostatic pressure effect act on, the air film have certain rigidity, to adjust grid
Sheet separation distributes gap automatic uniform, and equally distributed gap has the smallest leakage rate.Therefore, the present invention has
Leakage rate and the anti-ability axially disturbed are greatly reduced under identical operating temperature span.
Wherein, mounting groove 3 can be inverted U-channel, and stacking is put in 1 side of screen, and the screen 1 of stacking passes through elastic element 4 and bridge
It connects element 5 to be mounted in mounting groove 3, the upper side that wherein bridging element 5 is set to the screen 1 of stacking (will stack adding for screen
The opposite face of work face and machined surface is left and right end face, and lap is respectively defined as upper side, downside, leading flank, rear side
Face), elastic element 4 is set between bridging element 5 and the slot bottom of mounting groove 3.The two of the left and right end face of the screen 1 of stacking and slot
Vertical inner wall contact, side wall 6 are arranged in below the aperture position of inverted U-channel.
Screen 1 is not connected with bridging element 5 and mounting groove 3, is not connected mutually between screen 1, the downside of screen 1 exists
4 load of elastic element keeps certain contact with side wall 6 opposite with the slot bottom of same mounting groove 3 under the collective effect of frictional force.
In the present invention, screen 1 is 1~100 μm with a thickness of 1~15mm or so, the thickness deltat h of step 2, the face of step 2
Product accounts for the 0.1~0.8 of the 1 single side gross area of screen.
Screen 1 can choose the shapes such as polygon, the polygon with curl, arc, seamed edge knot along the perspective plane of thickness
Structure can choose band fillet, chamfering and keep sharp edge.
It is more that triangle, rectangle, other polygons and circle, ellipse, hyperbola and spline curve etc. may be selected in 2 shape of step
Single-stage or multistage pattern may be selected in kind form, step, and the forms such as right angle, inclined-plane, arc may be selected in the transition style between step,
Any combination is carried out on the basis of this.
With reference to Fig. 2, wherein a is conventionally form, and b, c are different screen shapes, and d, e, f, g are different step shapes, and h, i are
Different interim forms, j, k are combination examples.
It is two specific embodiments below, to confirm the effect of the application.
Embodiment 1
With reference to Fig. 1, Fig. 3, it is assumed that using shown in a in Fig. 2, one jiao of the screen groove profile for opening rectangle, then produced by heap poststack
Air film projection of shape be rectangle, high-pressure side with perspective plane be rectangle protrusion, wherein convex portion is with a thickness of 2 thickness of step
Δ h, this be it is constant, without protrusion with a thickness of screen spacing h0, be it is variable, when screen area is 12 × 20mm, step 2
When area is 6 × 10mm, sealing high-pressure side is adjacent two boundary (being set as left and upper), and pressure 0.8MPa, low-pressure side is located at the right side
Boundary, the 3.5mm length to connect with lower boundary, pressure 0.1MPa, boundary and lower boundary on the right, pressure square and position at
Linear relationship, then air film power and the relationship of screen gap h0 are shown in Fig. 3 a, obtain the pass of gas film stiffness Yu screen gap by interpolation
Fig. 3 b sees in system.As it can be seen that the structure makes air film generate 10 under different 2 thickness of step5The rigidity of N/m magnitude.
Embodiment 2
The geometrical model of RBCC two dimensional inlet, fixed wall 10 and removable plate 8 are shown with reference to Fig. 1, Fig. 4, Fig. 4
It is connected by hinge 7, the space surrounded forms flow-passage-changeable 9.Grid plate structure of the present invention is mounted on removable plate 8, with
Side wall contacts to form sealing structure, the rotational angle of hinge 7 is small, and speed is slow, and therefore, which, which can regard as, moves in parallel
Straight seal structure.The leakage rate of screen sealing structure and gap it is cube proportional, i.e.,Therefore, leakage rate pair
Gap variation is especially sensitive.By taking temperature change as an example: grid material is generally composite ceramic material resistant to high temperature, runner wall surface and
The material of screen mounting groove 3 is then generally high-temperature alloy.And the thermal expansion coefficient between two kinds of materials is respectively 2~4 × 10- 6M/m* DEG C and 12~18 × 10-6M/m* DEG C, it is assumed that thermal expansion is linear, if the linear expansion coefficient of mounting groove 3 is
αmetal, the linear expansion coefficient of screen 1 is αceramics, screen sealing structure length is L, when screen sealing structure temperature span is
When Δ T, it can be deformed poor Δ ε=L* Δ T (α between the twometal-αceramics).Assuming that screen stacks number with a thickness of t mm
Amount is N piece, then L=t × N, and number of gaps is N+1 between screen；Assuming that the linear expansion coefficient difference of material is 10 × 10-6m/m*·
DEG C, then temperature is every increases 100 DEG C, and modified difference is up to t × N μm, and original structure, the modified difference can be concentrated in a or two place's screen
On gap, it is assumed that the gap concentrates on 3 both ends of mounting groove, then leakage rate raising isUsing screen sealing structure of the invention, deformation will be evenly distributed to each
Locate gap, then leakage rate raising isIn general, h0 initial value is all in 1 μ
M hereinafter, t × N numerically then 102Magnitude, and number N is much larger than 1 (N > 10), therefore, the two leakage rate increased proportion can
Approximate representation isWithUnder the same temperature difference, structure of the invention leakage rate be can reach
4/ (N+1) of original technology2。
Claims (8)
1. a kind of screen stacks the whole screen sealing structure of clearance self-regulating, which is characterized in that including screen (1), the one of screen (1)
Face is machined with the recessed step (2) of micron dimension thickness, and multiple machined surfaces stack towards consistent screen (1) and are mounted on installation
In slot (3), the screen sealing structure of non-equal thickness air film is formed.
2. screen stacks the whole screen sealing structure of clearance self-regulating according to claim 1, which is characterized in that the screen
(1) with a thickness of 1~15mm or so, the thickness deltat h of step (2) is 1~100 μm, and the area of step (2) accounts for screen (1) single side
The 0.1~0.8 of the gross area, so that the air film with step-thickness is formed between screen, it, should since hydrostatic pressure effect acts on
Air film has certain rigidity, to play the role of adjusting grid inter-plate gap, distributes gap automatic uniform.
3. screen stacks the whole screen sealing structure of clearance self-regulating according to claim 1, which is characterized in that the step
(2) close to the high-pressure side of screen sealing structure.
4. screen stacks the whole screen sealing structure of clearance self-regulating according to claim 1, which is characterized in that the screen
(1) it is mounted in mounting groove (3) by elastic element (4) and bridging element (5) stacking, wherein bridging element (5) is set to
The side of the screen (1) of stacking, elastic element (4) are set between bridging element (5) and mounting groove (3).
5. screen stacks the whole screen sealing structure of clearance self-regulating according to claim 4, which is characterized in that the screen
(1) it is not connected, is not connected mutually between screen (1), screen (1) is in elastic element with bridging element (5) and mounting groove (3)
(4) load keeps certain contact with side wall (6) under the collective effect of frictional force.
6. screen stacks the whole screen sealing structure of clearance self-regulating according to claim 4, which is characterized in that the mounting groove
It (3) is inverted U-channel, elastic element (4) is set between slot bottom and bridging element (5), the both ends of the surface and slot of the screen (1) of stacking
The contact of two vertical inner walls, side wall (6) is arranged in below the aperture position of inverted U-channel.
7. screen stacks the whole screen sealing structure of clearance self-regulating according to claim 1, which is characterized in that the screen
It (1) is polygon, polygon or arc with curl along the perspective plane of thickness, seamed edge structure band fillet, chamfering or holding are sharp
Side.
8. screen stacks the whole screen sealing structure of clearance self-regulating according to claim 1, which is characterized in that the step
(2) shape is triangle, rectangle, polygon, circle, ellipse, hyperbola and spline curve, and step (2) is single-stage or multistage pattern,
The transition style between step is right angle, inclined-plane or arc.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910589750.XA CN110296218B (en) | 2019-07-02 | 2019-07-02 | Grid plate sealing structure with self-adjusting grid plate stacking gaps |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910589750.XA CN110296218B (en) | 2019-07-02 | 2019-07-02 | Grid plate sealing structure with self-adjusting grid plate stacking gaps |
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| Publication Number | Publication Date |
|---|---|
| CN110296218A true CN110296218A (en) | 2019-10-01 |
| CN110296218B CN110296218B (en) | 2020-09-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910589750.XA Active CN110296218B (en) | 2019-07-02 | 2019-07-02 | Grid plate sealing structure with self-adjusting grid plate stacking gaps |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112855943A (en) * | 2020-12-30 | 2021-05-28 | 北京宇航系统工程研究所 | Grid plate sealing structure with self-adjusting grid plate stacking clearance |
Citations (9)
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|---|---|---|---|---|
| US4917302A (en) * | 1988-12-30 | 1990-04-17 | The United States Of America As Represented By The United States National Aeronautics And Space Administration | High temperature flexible seal |
| US5082293A (en) * | 1990-11-09 | 1992-01-21 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | High temperature, flexible, fiber-preform seal |
| US6702300B1 (en) * | 2002-01-11 | 2004-03-09 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | High temperature seal for large structural movements |
| CN2742240Y (en) * | 2004-09-09 | 2005-11-23 | 四川日机密封件有限公司 | Double end dry air tight seal device |
| US20060110536A1 (en) * | 2003-10-22 | 2006-05-25 | Arthur Keigler | Balancing pressure to improve a fluid seal |
| CN201433872Y (en) * | 2009-07-17 | 2010-03-31 | 成都一通密封有限公司 | Dry gas seal for ammonia compressor |
| US10156402B1 (en) * | 2015-10-12 | 2018-12-18 | National Technology & Engineering Solutions Of Sandia, Llc | Systems and methods for spray cooling |
| CN208295110U (en) * | 2018-06-15 | 2018-12-28 | 福建腾博新材料科技有限公司 | A kind of stacking gasket |
| CN208457209U (en) * | 2018-07-27 | 2019-02-01 | 中国大唐集团科学技术研究院有限公司华中分公司 | A kind of Turbo-generator Set hydrogen seal device |
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2019
- 2019-07-02 CN CN201910589750.XA patent/CN110296218B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4917302A (en) * | 1988-12-30 | 1990-04-17 | The United States Of America As Represented By The United States National Aeronautics And Space Administration | High temperature flexible seal |
| US5082293A (en) * | 1990-11-09 | 1992-01-21 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | High temperature, flexible, fiber-preform seal |
| US6702300B1 (en) * | 2002-01-11 | 2004-03-09 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | High temperature seal for large structural movements |
| US20060110536A1 (en) * | 2003-10-22 | 2006-05-25 | Arthur Keigler | Balancing pressure to improve a fluid seal |
| CN2742240Y (en) * | 2004-09-09 | 2005-11-23 | 四川日机密封件有限公司 | Double end dry air tight seal device |
| CN201433872Y (en) * | 2009-07-17 | 2010-03-31 | 成都一通密封有限公司 | Dry gas seal for ammonia compressor |
| US10156402B1 (en) * | 2015-10-12 | 2018-12-18 | National Technology & Engineering Solutions Of Sandia, Llc | Systems and methods for spray cooling |
| CN208295110U (en) * | 2018-06-15 | 2018-12-28 | 福建腾博新材料科技有限公司 | A kind of stacking gasket |
| CN208457209U (en) * | 2018-07-27 | 2019-02-01 | 中国大唐集团科学技术研究院有限公司华中分公司 | A kind of Turbo-generator Set hydrogen seal device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112855943A (en) * | 2020-12-30 | 2021-05-28 | 北京宇航系统工程研究所 | Grid plate sealing structure with self-adjusting grid plate stacking clearance |
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| CN110296218B (en) | 2020-09-29 |
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