CN102418568B - fingertip sealing device - Google Patents
fingertip sealing device Download PDFInfo
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- CN102418568B CN102418568B CN201110455340.XA CN201110455340A CN102418568B CN 102418568 B CN102418568 B CN 102418568B CN 201110455340 A CN201110455340 A CN 201110455340A CN 102418568 B CN102418568 B CN 102418568B
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- finger
- sealing device
- fingertip
- baffle plate
- finger tip
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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 the finger sealing device about leaking for controlling Secondary Flow in a kind of gas turbine engine.
Background technique
At present, in gas turbine engine field, be widely used the leakage that comb tooth seals to control Secondary Flow.Although the sealing of comb tooth is simple in structure, seal performance is poor.Comb tooth sealing can not adapt to the centrifugal or thermal expansion of rotor, therefore when design, must keep turning, enough gaps between stator, has so just reduced seal performance.Although 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 sealing configuration that diameter is less.
Finger tip sealing is the new technology that developed recently gets up.It and brush seal structure are similar, adopt a series of tinsel to replace brush silk, have reached raising seal performance, the object cutting down finished cost.Finger tip sealing can be divided into log spiral, the various structural type such as circular arc line according to the difference that refers to body molded line.External existing part Patents.Domestic applications a kind of patent of invention of fluid static-pressure type fingertip sealing structure (application number: 200610010500).This structure is relatively complicated, front grommet, front split ring, high pressure finger tip ring, low pressure finger tip ring, rear split ring and rear grommet six parts, consists of.Its mesolow finger tip ring is " L " shape thin walled structures, on its corresponding rotor, is processed with aerodynamic lift groove.During work, rely on aerodynamic force that finger tip ring and rotor are disengaged and keep less gap.Because this structure is a kind of non-contacting sealing 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 manufacturing large scale sealing configuration, be difficult to guarantee required precision, add this structure and can only adopt single piece production, efficiency is low, and cost of production is higher, has limited application.In addition, the technique that is processed with aerodynamic lift groove on its corresponding rotor is also more 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 sealing device that cost of production is lower, to solve, prior art fingertip sealing structure seal performance is not good enough, processed complex, problem that cost of production is higher.
Technological scheme of the present invention is: a kind of finger sealing device, is comprised of front screen, backboard and some layers of finger tip sheet being arranged between the two; Described front screen and backboard are annular platy structure; Described finger tip sheet has from its inner radius the finger body that recessed line style is arranged, and the finger body between adjacent two layers finger tip sheet staggers mutually; Described finger tip sheet is provided with some to pilot hole; Described front screen, backboard and finger tip sheet adopt rivet or welding manner to be connected; The concave shape curve that described finger body is not waited by two curvature forms.
Beneficial effect of the present invention: finger sealing device of the present invention refers to the design of body by recessed line style, can adapt to relative displacement that the vibration of axle and rotor and seal arrangement produce due to centrifugal force and thermal distortion and larger rotor axial displacement; Finger body between adjacent finger tip sheet staggers mutually, finger tip sealing can in whole Life cycle, keep and rotor between micro-gap, thereby reach raising seal performance, reduce the object of leakage; When seal arrangement produces radial displacement due to centrifugal force and thermal distortion, the finger body design of recessed line style is larger than the area of contact of the finger body of other line style and rotating shaft, thereby reduced the contact of unit area, reduced the heating value of sealing surface, improved working life.The present invention is simple in structure, only front screen, finger tip sheet and backboard three parts, consists of, and has processing technology simple, and cost is low, is applicable to manufacturing the seal arrangement of various sizes, meets the feature of requirements of mass production.
Accompanying drawing explanation
Fig. 1 is the structural representation of finger sealing device the first mode of execution of the present invention;
Fig. 2 is the front view of the middle finger of invention shown in Fig. 1 splinter 3;
Fig. 3 is the partial enlarged drawing of the sheet of finger tip shown in Fig. 23;
Fig. 4 is the structural representation of finger sealing device the 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
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
Refer to Fig. 1, it is the structural representation of finger sealing device the first mode of execution of the present invention.Described finger sealing device is comprised of front screen 1, backboard 2 and five layers of finger tip sheet 3 being arranged between the two, and described front screen 1, backboard 2 and finger tip sheet 3 adopt rivets or welding manner to be connected.Wherein, described front screen 1 is an annular platy structure, and Main Function is that finger tip sheet 3 is supported and protected, and this structure is similar to the front grommet of fluid static-pressure type fingertip sealing structure, but has the function of front grommet and front split ring simultaneously.Described backboard 2 is also an annular platy structure, and Main Function is that finger tip sheet 3 is supported and protected, and the backsight ring structure of this structure and fluid static-pressure type fingertip sealing is similar, but has cancelled rear split ring structure.Described finger tip sheet 3 is folded precision machined tinsels, the inner radius of each tinsel processes a series of finger body 4 with mechanical means, in present embodiment, 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 the concave shape curve that two curves of body are not waited by two curvature forms, a radius of curvature 85.3mm, another radius of curvature 87.5mm, refers to body outside diameter 110mm.
Please refer to Fig. 2 and Fig. 3, 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, described finger body 4 adopts valley line Profile Design, make every layer to refer to that the finger body gap 6 between body 4 is just in time positioned at the center position that adjacent finger tip sheet refers to body 4, so adjacent layer finger tip sheet 3 is interlaced with each other simultaneously, thereby guarantees seal performance.Compare with other structure finger tip sealing, on the finger tip sheet 3 of this structure finger tip sealing, two adjacent finger bodies 4 are near there is no seal shoe between internal diameter and rotor contacting point.In addition, on each finger tip sheet, 3 also have some paired pilot holes 5, and during assembling, between different finger tip sheets 3, paired hole is staggered, to every layer of gap that refers to body 4 covered by the finger body 4 of adjacent layer.
Finger sealing device of the present invention adopts very little gap or interference fit according to service condition and axle or rotor.Wherein, be arranged between each finger tip sheet 3 between front screen 1 and backboard 2 and stop passing through of air-flow by staggered finger body 4, thereby realize, obturage, avoid leaking.And described finger body 4 is recessed Alignment Design, when seal arrangement produces radial displacement due to centrifugal force and thermal distortion, the finger body design of recessed line style is larger than the area of contact of the finger body of other line style and rotating shaft, thereby reduced the contact of unit area, the heating value that reduces sealing surface, has improved working life.
In present embodiment, described each layer refers to that body 4 sizes and line style all equate, and intensity is consistent.Described five layers of finger tip sheet 3 have identical structural parameter, tens of tinsels can be stacked man-hour adding, and adopt the method time processing moulding such as line cutting, therefore have higher manufacturing efficiency.Adopt valley line molded line to refer to that body design can optimize the seal performance that regulates finger tip sealing by adjusting a small amount of structural parameter such as radius of curvature, length of curve, the performance parameters such as fretting wear speed, make it to reach user's requirement.
Refer to Fig. 4, it is the structural representation of finger sealing device the second mode of execution of the present invention.In present embodiment, described finger sealing device is also comprised of front screen 1, backboard 2 and six layers of finger tip sheet 3 being arranged between the two.Wherein, described finger tip sheet 3 is made for C/C composite material, and described backboard 2 is provided with comb ring gear 7 along rotor axial, thereby can realize the axial comb tooth sealing of rotor.Present embodiment is combined finger tip sealing and comb tooth sealed junction, make aero gas turbine engine bearing bore there is better sealing effect, while is simple in structure, lightweight, seal performance is good, withstand voltage, durability meets long lifetime gas turbine engine demand, be convenient to assembling, can adapt to the axial displacement of rotor.In present embodiment, basic parameter is as follows: sealed diameter 400mm, and finger tip sheet thickness 2mm, refers to 150 of body quantity, forms a radius of curvature 120.5mm in two curves that refer to body, another radius of curvature 128.5mm, refers to body outside diameter 430mm.
Present embodiment is because finger tip sheet has adopted density low, the C/C composite material that Young's modulus is little, therefore under identical weight index, C/C composite material finger tip sheet can design thicklyer, radial dimension is less, thereby greatly reduce difficulty of processing, improved quality, brought than the more excellent seal performance of finger tip sealing that adopts metal material processing.In addition, the sealing of the finger tip of C/C composite material and the sealing of comb tooth adopt relatively independent structural design, and therefore, when one of them sealing configuration breaks down, another structure can also normally be worked, thereby has improved the reliability and security of whole device.Because finger tip sheet adopts the manufacture of C/C composite material, avoided the generation of galling thing, therefore can be for the sealing of bearing bore.Long service life due to the sealing of combined type finger tip, can meet the life-cycle usage requirement of long-life engine, therefore has lower user cost.
Above-mentioned two mode of executions have disclosed two better embodiment of finger sealing device of the present invention, but the invention is not restricted to above-mentioned mode of execution, on the basis of disclosing at above-mentioned mode of execution, can also be improved further.As the number of plies of finger sealing device 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, 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 more intensive, sealability is better, and the corresponding finger tip sheet number of plies can be relatively less, when corresponding manufacture difficulty can increase, therefore refer to that body number can have more actual sealability and require to adjust.
The present invention can improve 20%～50% seal performance on the basis of brush seal again, cut down finished cost approximately 50% simultaneously, thereby for providing a kind of, gas turbine engine can under high temperature, high-speed condition, use for a long time and have good seal performance, cheaply seal arrangement.In addition, finger sealing device of the present invention no longer need to be processed aerodynamic lift groove on rotor, has therefore further reduced cost of production, has larger using value.
Claims (5)
1. a finger sealing device, is characterized by: front screen (1), backboard (2) and the some layers of finger tip sheet (3) that are arranged between the two, consist of; Described front screen (1) and backboard (2) are annular platy structure; Described finger tip sheet (3) has from its inner radius the finger body (4) that recessed line style is arranged, and the finger body (4) between adjacent two layers finger tip sheet staggers mutually; Described finger tip sheet is provided with some to pilot hole (5); Described front screen (1), backboard (2) and finger tip sheet (3) adopt rivet or welding manner to be connected; The concave shape curve that described finger body (4) is not waited by two curvature forms.
2. finger sealing device according to claim 1, is characterized by: every layer of gap that refers to body (4) is just in time positioned at the center position that adjacent finger tip sheet refers to body (4).
3. finger sealing device according to claim 1 and 2, is characterized by: described finger tip sheet (3) is made by metal or C/C composite material.
4. finger sealing device according to claim 1, is characterized by: described each layer refers to that body (4) size and line style all equate, and intensity is consistent.
5. finger sealing device according to claim 1, is characterized by: described 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 CN102418568A (en) | 2012-04-18 |
| CN102418568B true 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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| CN (1) | CN102418568B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105317472A (en) * | 2015-12-01 | 2016-02-10 | 秦皇岛鱼鳞电力设备有限公司 | Elastic sheet for follow-up suspended steam sealing belt of turbine motor and steam sealing structure thereof |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104864102B (en) * | 2015-04-03 | 2017-08-08 | 清华大学 | A kind of rear baffle band contactless finger sealing device of micropore texture |
| CN104806301B (en) * | 2015-04-03 | 2016-11-02 | 清华大学 | A kind of noncontact finger tip-labyrinth-brush composite seal |
| CN105545375B (en) * | 2015-12-14 | 2017-03-08 | 中国燃气涡轮研究院 | Twin beams finger sealing device |
| CN107725784B (en) * | 2017-09-05 | 2019-10-25 | 西安理工大学 | A kind of long-life low leakage finger tip-high temperature fluid medium combination sealing arrangement |
| 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 |
| 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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| 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 |
| CN101649908A (en) * | 2009-09-18 | 2010-02-17 | 哈尔滨工程大学 | Labyrinth and fingertip combined type seal structure |
| 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 |
| 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 |
| CN201779258U (en) * | 2009-12-25 | 2011-03-30 | 中国燃气涡轮研究院 | Fingertip seal device with integration design |
Family Cites Families (2)
| 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 |
| US7735833B2 (en) * | 2006-11-14 | 2010-06-15 | The University Of Akron | Double padded finger seal |
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2011
- 2011-12-31 CN CN201110455340.XA patent/CN102418568B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN101649908A (en) * | 2009-09-18 | 2010-02-17 | 哈尔滨工程大学 | Labyrinth and fingertip combined type seal structure |
| 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 |
| 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 |
| 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 (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105317472A (en) * | 2015-12-01 | 2016-02-10 | 秦皇岛鱼鳞电力设备有限公司 | Elastic sheet for follow-up suspended steam sealing belt of turbine motor and steam sealing structure thereof |
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| Publication number | Publication date |
|---|---|
| CN102418568A (en) | 2012-04-18 |
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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 |