CN102418568A - Fingertip sealing device - Google Patents
Fingertip sealing device Download PDFInfo
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- CN102418568A CN102418568A CN201110455340XA CN201110455340A CN102418568A CN 102418568 A CN102418568 A CN 102418568A CN 201110455340X A CN201110455340X A CN 201110455340XA CN 201110455340 A CN201110455340 A CN 201110455340A CN 102418568 A CN102418568 A CN 102418568A
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- finger tip
- fingertip
- baffle plate
- finger
- sealing device
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Abstract
The invention relates to a sealing device, in particular to a fingertip sealing device for controlling secondary flow leakage in a gas turbine engine. The fingertip sealing device consists of a front baffle plate, a rear baffle plate and a plurality of fingertip sheets arranged between the front baffle plate and the rear baffle plate, wherein both the front baffle plate and the rear baffle plate have annular platy structures; downwards sunken finger bodies which are arranged linearly are formed on the inner diameters of the fingertip sheets; the finger bodies between two adjacent layers of fingertip sheets are staggered; a plurality of pairs of assembly holes are formed in the fingertip sheets; and the front baffle plate, the rear baffle plate and the fingertip sheets are connected with one another through rivets in a riveting or welding mode. The fingertip sealing device can adapt to vibration of a shaft, relative displacement, which is produced by a centrifugal force and thermal deformation, between a rotor and the sealing device, and larger axial displacement of the rotor, so that aims of improving the sealing property and reducing leakage are fulfilled, and the service life is prolonged. The fingertip sealing device has the characteristics of being suitable for manufacturing sealing devices in various sizes and meeting requirements for batch production, along with simple structure and low cost.
Description
Technical field
The present invention relates to a kind of seal arrangement, especially about being used to control the finger tip seal arrangement that secondary flow is leaked in a kind of gas turbine engine.
Background technique
At present, widely-used comb tooth seals the leakage of controlling secondary flow in the gas turbine engine field.Though the sealing of comb tooth is simple in structure, seal performance is relatively poor.Comb tooth sealing can not adapt to the centrifugal or thermal expansion of rotor, therefore when design, must keep changeing, enough gaps between the stator, has so just reduced seal performance.Though the brush seal part has solved the problem of labyrinth gas seals poor-performing, complex process, the processing cost of brush seal are higher, are not suitable for the less sealing configuration of diameter.
The finger tip sealing is the new technology that developed recently gets up.It and brush seal similar adopt a series of tinsel to replace the brush silk, have reached the raising seal performance, the purpose that cuts down finished cost.The finger tip sealing can be divided into log spiral, various structural types such as circular arc line according to the difference that refers to the body molded lines.External existing partial correlation patent.Domestic applications a kind of patent of invention of fluid static-pressure type fingertip sealing structure (application number: 200610010500).This structure is relatively complicated, is made up of preceding grommet, front split ring, high pressure finger tip ring, low pressure finger tip ring, rear split ring and back grommet six parts.Its mesolow finger tip ring is " L " shape thin walled structures, on its corresponding rotor, is processed with the aerodynamic lift groove.Rely on aerodynamic force that finger tip ring and rotor are disengaged during work and keep less clearance.Because this structure is a kind of noncontact seal structure, heating value is little, so can adapt to very high serviceability temperature and potted line speed.But " L " shape thin walled structures requirement on machining accuracy of low pressure finger tip ring is very high, and very easily distortion, therefore when making the large scale sealing configuration, is difficult to guarantee required precision; Add this structure and can only adopt single piece production; Efficient is low, and cost of production is higher, has limited application.In addition, the technology that on its corresponding rotor, is processed with the aerodynamic lift groove is also complicated, has further increased cost of production.
Summary of the invention
Technical problem to be solved by this invention is: provide that a kind of obturaging property is good, long service life, finger tip seal arrangement that cost of production is lower, existing technology fingertip sealing structure seal performance is not good enough to solve, processed complex, cost of production problem of higher.
Technological scheme of the present invention is: a kind of finger tip seal arrangement, form by front screen, backboard and the several layers finger tip sheet that is arranged between the two; Said front screen and backboard are the platy structure of annular; Said finger tip sheet has the finger body that recessed line style is arranged from its inner radius, and the finger body between the adjacent two layers finger tip sheet staggers each other; Said finger tip sheet is provided with some to pilot hole; Said front screen, backboard and finger tip sheet adopt rivet or welding manner to be connected.
Beneficial effect of the present invention: finger tip seal arrangement of the present invention refers to the design of body through recessed line style, vibration and the rotor that can adapt to axle with seal arrangement because centrifugal force and the relative displacement of thermal distortion generation and bigger rotor axial displacement; Finger body between the adjacent finger tip sheet staggers each other, finger tip sealing can in whole Life cycle, keep and rotor between micro-gap, thereby reach the raising seal performance, the purpose that reduces to leak; When seal arrangement because during centrifugal force and thermal distortion generation radial displacement; The finger body of recessed line style designs bigger than the area of contact of the finger body of other line style and rotating shaft; Thereby reduced the contact pressure of unit area, reduced the heating value of sealing surface, improved working life.The present invention is simple in structure, only is made up of front screen, finger tip sheet and backboard three parts, and it is simple to have processing technology, and cost is low, is fit to make the seal arrangement of various sizes, satisfies the characteristics of requirements of mass production.
Description of drawings
Fig. 1 is the structural representation of finger tip seal arrangement first mode of execution of the present invention;
Fig. 2 is the front view of invention middle finger splinter 3 shown in Figure 1;
Fig. 3 is the partial enlarged drawing of finger tip sheet 3 shown in Figure 2;
Fig. 4 is the structural representation of finger tip seal arrangement second mode of execution of the present invention;
Wherein, 1-front screen, 2-backboard, 3-finger tip sheet, 4-refer to that body, 5-pilot hole, 6-refer to body gap, 7-comb ring gear.
Embodiment
Do further detailed description below in conjunction with the accompanying drawing specific embodiments of the invention.
See also Fig. 1, it is the structural representation of finger tip seal arrangement first mode of execution of the present invention.Said finger tip seal arrangement is made up of front screen 1, backboard 2 and five layers of finger tip sheet 3 being arranged between the two, and said front screen 1, backboard 2 and finger tip sheet 3 adopt rivets or welding manner to be connected.Wherein, said front screen 1 is the platy structure of an annular, and main effect is that finger tip sheet 3 is supported and protects, and this structure is similar with the preceding grommet of fluid static-pressure type fingertip sealing structure, but has the function of preceding grommet and front split ring simultaneously.Said backboard 2 also is the platy structure of an annular, and main effect is that finger tip sheet 3 is supported and protects, and this structure is similar with the backsight ring structure that fluid static-pressure type fingertip seals, but has cancelled the rear split ring structure.Said finger tip sheet 3 is folded precision machined tinsels, and the inner radius of each tinsel all processes a series of finger body 4 with mechanical means, in this mode of execution; Sealed diameter 90mm, finger tip sheet thickness 0.15mm, 5 of finger tip sheet quantity; Refer to 72 of body quantity, formation refers to that two curves of body are formed a radius of curvature 85.3mm by the concave shape curve that two curvature do not wait; Another radius of curvature 87.5mm refers to body outside diameter 110mm.
Please consult Fig. 2 and Fig. 3 simultaneously, wherein Fig. 2 is the front view of Fig. 1 finger tip sheet, and Fig. 3 is the partial enlarged drawing of Fig. 2.Wherein, said finger body 4 adopts the design of valley line molded lines, make every layer to refer to that the finger body gap 6 between the body 4 just in time is positioned at the center position that adjacent finger tip sheet refers to body 4 simultaneously, so adjacent layer finger tip sheet 3 is interlaced with each other, thereby guarantees seal performance.Compare with other structure finger tip sealing, two adjacent finger bodies 4 are near not having seal shoe between internal diameter and the rotor contacting point on the finger tip sheet 3 of this structure finger tip sealing.In addition, 3 also have some paired pilot holes 5 on each finger tip sheet, during assembling between the different finger tip sheets 3 paired hole be staggered so that every layer of slit that refers to body 4 covered by the finger body 4 of adjacent layer.
Finger tip seal arrangement of the present invention adopts very little gap or interference fit according to service condition and axle or rotor.Wherein, be arranged between each the finger tip sheet 3 between front screen 1 and the backboard 2 through staggered finger body 4 and stop passing through of air-flows, thereby realize obturaging, avoid leaking.And said finger body 4 is recessed line style design; When seal arrangement because during centrifugal force and thermal distortion generation radial displacement; The finger body of recessed line style designs bigger than the area of contact of the finger body of other line style and rotating shaft; Thereby reduced the contact pressure of unit area, reduced the heating value of sealing surface, improved working life.
In this mode of execution, said each layer refers to that body 4 sizes and line style all equate, and intensity is consistent.Said five layers of finger tip sheet 3 have identical structural parameter, can tens of tinsels be stacked man-hour adding, and adopt method time processing moulding such as line cutting, therefore have higher production efficiency.Adopt the valley line molded lines to refer to that the body design can optimize the seal performance of regulating the finger tip sealing through a small amount of structural parameter such as adjustment radius of curvature, lengths of curve, performance parameters such as fretting wear speed make it to reach user's requirement.
See also Fig. 4, it is the structural representation of finger tip seal arrangement second mode of execution of the present invention.In this mode of execution, said finger tip seal arrangement also is made up of front screen 1, backboard 2 and six layers of finger tip sheet 3 being arranged between the two.Wherein, said finger tip sheet 3 is processed for the C/C composite material, and said backboard 2 is provided with comb ring gear 7 along rotor axial, thereby can realize the axial comb tooth sealing of rotor.This mode of execution lumps together finger tip sealing and comb tooth sealed junction; Make the aero gas turbine engine bearing bore have better sealing effect; While is simple in structure, in light weight, seal performance is good, withstand voltage; Durability satisfies long lifetime gas turbine engine demand, is convenient to assembling, can adapt to the axial displacement of rotor.In this mode of execution, basic parameter is following: sealed diameter 400mm, and finger tip sheet thickness 2mm refers to 150 of body quantity, forms radius of curvature 120.5mm in two curves that refer to body, another radius of curvature 128.5mm refers to body outside diameter 430mm.
This mode of execution is because the finger tip sheet has adopted density low; The C/C composite material that Young's modulus is little; Therefore C/C composite material finger tip sheet can design thicklyer under the identical weight index, and radial dimension is littler, thereby greatly reduces difficulty of processing; Improve quality, brought than adopted the more excellent seal performance of finger tip sealing of metal material processing.In addition, relatively independent structural design is adopted in the finger tip of C/C composite material sealing and the sealing of comb tooth, and therefore when one of them sealing configuration breaks down, another structure can also proper functioning, thereby has improved the reliability and security of whole device.Because the finger tip sheet adopts the manufacturing of C/C composite material, has avoided the generation of galling thing, therefore can be used for the sealing of bearing bore.Because the long service life of combined type finger tip sealing can satisfy the life-cycle usage requirement of long-life engine, therefore has lower user cost.
Above-mentioned two mode of executions have disclosed two preferred embodiments of finger tip seal arrangement of the present invention, but the invention is not restricted to above-mentioned mode of execution, on the basis that above-mentioned mode of execution disclosed, can also do further improvement.The number of plies like finger tip seal arrangement middle finger splinter of the present invention is not limited to 6 layers; Its number of plies can be done to add or reduce according to the demand of actual sealability; But should be more than 2, and the number of plies does not have technical restriction at most, and can be definite according to structure space size and performance need.In addition, the finger body quantity on every layer of finger tip sheet does not have technical restriction, can choose according to sealed diameter and potted line speed; Wherein, Refer to that body is intensive more, sealability is good more, and the corresponding finger tip sheet number of plies can be less relatively; When corresponding manufacture difficulty can increase, refer to that therefore the body number can have more actual sealability and require to adjust.
The present invention can improve 20%～50% seal performance again on the basis of brush seal; Cut down finished cost about 50% simultaneously; Thereby, gas turbine engine can under high temperature, high-speed condition, use and have good seal performance, seal arrangement cheaply for a long time for providing a kind of.In addition, finger tip seal arrangement of the present invention no longer need be processed the aerodynamic lift groove on rotor, has therefore further reduced cost of production, has bigger using value.
Claims (6)
1. finger tip seal arrangement is characterized by: be made up of front screen (1), backboard (2) and the several layers finger tip sheet (3) that is arranged between the two; Said front screen (1) and backboard (2) are the platy structure of annular; Said finger tip sheet (3) has the finger body (4) that recessed line style is arranged from its inner radius, and the finger body (4) between the adjacent two layers finger tip sheet staggers each other; Said finger tip sheet is provided with some to pilot hole (5); Said front screen (1), backboard (2) and finger tip sheet (3) adopt rivet or welding manner to be connected.
2. finger tip seal arrangement according to claim 1 is characterized by: every layer of slit that refers to body (4) just in time is positioned at the center position that adjacent finger tip sheet refers to body (4).
3. finger tip seal arrangement according to claim 1 and 2 is characterized by: said finger body (4) is formed by the concave shape curve that two curvature do not wait.
4. finger tip seal arrangement according to claim 1 and 2 is characterized by: said finger tip sheet (3) is processed by metal or C/C composite material.
5. finger tip seal arrangement according to claim 1 is characterized by: said each layer refers to that body (4) size and line style all equate, and intensity is consistent.
6. finger tip seal arrangement according to claim 1 is characterized by: said backboard (2) is provided with some comb ring gears (7) along rotor axial.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110455340.XA CN102418568B (en) | 2011-12-31 | 2011-12-31 | fingertip sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110455340.XA CN102418568B (en) | 2011-12-31 | 2011-12-31 | fingertip sealing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102418568A true CN102418568A (en) | 2012-04-18 |
| CN102418568B CN102418568B (en) | 2014-10-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110455340.XA Active CN102418568B (en) | 2011-12-31 | 2011-12-31 | fingertip sealing device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104806301A (en) * | 2015-04-03 | 2015-07-29 | 清华大学 | Non-contact fingertip-labyrinth-brush type combined sealer |
| CN104864102A (en) * | 2015-04-03 | 2015-08-26 | 清华大学 | Non-contact fingertip seal device with rear baffle adopting micropore texture |
| CN105545375A (en) * | 2015-12-14 | 2016-05-04 | 中国燃气涡轮研究院 | Double-beam finger seal device |
| CN107725784A (en) * | 2017-09-05 | 2018-02-23 | 西安理工大学 | A kind of long-life low leakage finger tip high temperature fluid medium combination sealing arrangement |
| CN110919308A (en) * | 2019-12-05 | 2020-03-27 | 中国航发四川燃气涡轮研究院 | Fingertip piece boot shaping method |
| CN114575935A (en) * | 2022-03-01 | 2022-06-03 | 西安热工研究院有限公司 | Self-adaptive flexible steam turbine shaft seal structure |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105317472B (en) * | 2015-12-01 | 2016-11-30 | 秦皇岛鱼麟电力设备有限公司 | A kind of servo-actuated floated packing band flexure strip of turbine and gland seal structure thereof |
Citations (8)
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|---|---|---|---|---|
| US20030025274A1 (en) * | 2001-08-02 | 2003-02-06 | Honeywell International, Inc. | Laminated finger seal with stress reduction |
| CN1932343A (en) * | 2006-09-06 | 2007-03-21 | 中国船舶重工集团公司第七�三研究所 | Fluid static-pressure type fingertip sealing structure |
| US20080122183A1 (en) * | 2006-11-14 | 2008-05-29 | Braun Minel J | Double Padded Finger Seal |
| CN101649908A (en) * | 2009-09-18 | 2010-02-17 | 哈尔滨工程大学 | Labyrinth and fingertip combined type seal structure |
| CN101749430A (en) * | 2009-12-25 | 2010-06-23 | 中国燃气涡轮研究院 | Finger tip sealing device and the flexible constrictor |
| CN101749055A (en) * | 2009-12-25 | 2010-06-23 | 中国燃气涡轮研究院 | Involute-type fingertip sealing structure |
| CN101749429A (en) * | 2009-12-25 | 2010-06-23 | 中国燃气涡轮研究院 | Fingertip seal structure and back baffle plate thereof |
| CN201779258U (en) * | 2009-12-25 | 2011-03-30 | 中国燃气涡轮研究院 | Fingertip seal device with integration design |
-
2011
- 2011-12-31 CN CN201110455340.XA patent/CN102418568B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030025274A1 (en) * | 2001-08-02 | 2003-02-06 | Honeywell International, Inc. | Laminated finger seal with stress reduction |
| CN1932343A (en) * | 2006-09-06 | 2007-03-21 | 中国船舶重工集团公司第七�三研究所 | Fluid static-pressure type fingertip sealing structure |
| US20080122183A1 (en) * | 2006-11-14 | 2008-05-29 | Braun Minel J | Double Padded Finger Seal |
| CN101649908A (en) * | 2009-09-18 | 2010-02-17 | 哈尔滨工程大学 | Labyrinth and fingertip combined type seal structure |
| CN101749430A (en) * | 2009-12-25 | 2010-06-23 | 中国燃气涡轮研究院 | Finger tip sealing device and the flexible constrictor |
| CN101749055A (en) * | 2009-12-25 | 2010-06-23 | 中国燃气涡轮研究院 | Involute-type fingertip sealing structure |
| CN101749429A (en) * | 2009-12-25 | 2010-06-23 | 中国燃气涡轮研究院 | Fingertip seal structure and back baffle plate thereof |
| CN201779258U (en) * | 2009-12-25 | 2011-03-30 | 中国燃气涡轮研究院 | Fingertip seal device with integration design |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104806301A (en) * | 2015-04-03 | 2015-07-29 | 清华大学 | Non-contact fingertip-labyrinth-brush type combined sealer |
| CN104864102A (en) * | 2015-04-03 | 2015-08-26 | 清华大学 | Non-contact fingertip seal device with rear baffle adopting micropore texture |
| CN105545375A (en) * | 2015-12-14 | 2016-05-04 | 中国燃气涡轮研究院 | Double-beam finger seal device |
| CN105545375B (en) * | 2015-12-14 | 2017-03-08 | 中国燃气涡轮研究院 | Twin beams finger sealing device |
| CN107725784A (en) * | 2017-09-05 | 2018-02-23 | 西安理工大学 | A kind of long-life low leakage finger tip high temperature fluid medium combination sealing arrangement |
| CN110919308A (en) * | 2019-12-05 | 2020-03-27 | 中国航发四川燃气涡轮研究院 | Fingertip piece boot shaping method |
| CN110919308B (en) * | 2019-12-05 | 2020-10-09 | 中国航发四川燃气涡轮研究院 | Fingertip piece boot shaping method |
| CN114575935A (en) * | 2022-03-01 | 2022-06-03 | 西安热工研究院有限公司 | Self-adaptive flexible steam turbine shaft seal structure |
| CN114575935B (en) * | 2022-03-01 | 2024-01-23 | 西安热工研究院有限公司 | Self-adaptive flexible steam turbine shaft seal structure |
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| CN102418568B (en) | 2014-10-22 |
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Address after: No. 999, Xuefu Road, Xindu, Chengdu, Sichuan 610500 Patentee after: AECC SICHUAN GAS TURBINE Research Institute Address before: 621703 Sichuan Jiangyou 305 mailbox operation monitoring department Patentee before: CHINA GAS TURBINE EST |
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