CN102425461B - Low-hysteresis reeled and fixed brush type sealing device - Google Patents
Low-hysteresis reeled and fixed brush type sealing device Download PDFInfo
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- CN102425461B CN102425461B CN201110458368.9A CN201110458368A CN102425461B CN 102425461 B CN102425461 B CN 102425461B CN 201110458368 A CN201110458368 A CN 201110458368A CN 102425461 B CN102425461 B CN 102425461B
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Abstract
The invention discloses a low-hysteresis reeled and fixed brush type sealing device which comprises a brush ring, a brush type sealing base (2) and a retainer ring (4), wherein the brush ring is composed of a brush strand element, a front baffle (7) and a rear baffle (3); the brush strand element is composed of a brush strand (8), a core wire (5) and a sleeve (6); and the brush ring is fixedly arranged on the brush type sealing base (2) through the retainer ring (4), thereby forming the contact sealing between a rotor and a stator. The sealing device provided by the invention is suitable for more working conditions; for the condition of a high-sealing pressure difference, the reducing of the flexibility of the brush strand is lesser, so that the rigidity of the sealing device is basically controlled at a design value under an initial mounting condition; the influence of the working conditions on the movement of the brush strand is smaller, so that the sealing property and the service life are more stable; and compared with a welding type sealing structure, the reeled and fixed brush type sealing structure has the advantages that the processing cost is lowered, the reeled and fixed brush type sealing structure is suitable for the selection of non-metal brush strand materials, and a new selection for the sealing device for oil/gas sealing, such as a bearing bore and the like, is provided.
Description
Technical field
The invention belongs to sealing technique, relate to a kind of brush seal installation, applicable to as the gas/gas of gas turbine engine primary and secondary stream, oil/gas sealing.
Background technique
In the secondary stream of gas turbine engine, extensively adopt the tooth-like sealing of combing, three kinds of forms of obturaging such as graphite seal and brush seal.There is feature separately in these three kinds of structures: comb tooth sealing is to obturage in a kind of gap, and it is simple in structure, reliable operation, using scope are the widest, and the life-span is long, but seal performance is poor.Comb tooth sealing can not adapt to the centrifugal or thermal expansion of rotor, therefore in the time of design, must keep turning, enough gaps between stator, thereby reduce seal performance.Voltage endurance capability and the temperature resistant capability of graphite grazing are relatively low, and its durability can not meet long-life requirement, limit it in the in-engine application of civil aviation.
Brush seal invention original intention is for replacing the sealing of comb tooth, solving the poor problem of seal performance.Typical brush seal is existing part Patents both at home and abroad.One of typical structure has the solder type brush seal structure of Rolls-royce company, its structure is the simplest, by forward and backward baffle plate, and the brush tow in the middle of clamping, and forming one by laser or the electron beam welding of circumferencial direction, this structural type is also to apply at present a most general class brush ring structure.This structure brush seal, because of welding processing mode, is only applicable to metallic material brush silk.Near heat-affected zone weld seam, brush wire material characteristic changes, and causes brush silk to become fragile and produces undercut, reduces brush silk intensity, makes it that fracture of wire easily occur at work.
The brush-hair seal (patent No. 98805179.6) of MTU company, discloses a kind of non-solder type brush seal.Wherein, clamping brush tow between header board and support plate, brush tow free end is crossed support plate endoporus and is stretched out to inner edge, contacts, to keep minimum clearance sealing with rotor.Under initial installment state, the brush tow free end radially of this sealing structure is vertical with rotor axial, does not fit with support plate.Brush tow free end is by the operating pressure differential effect in running, the support plate of laminating low voltage side.Along with the increase of operating pressure differential, brush tow and support plate contact increase, and the pressure of the closed cavity forming between brush tow and support plate can't increase and significantly increase with high side pressure, can not reduce the contact force of brush silk and support plate, thereby the recovery capability that brush silk reply rotor is beated and be out of shape laterally after making a concession reduces, brush tow and rotor form larger gap, cause seal performance to decline.
Summary of the invention
Object of the present invention: improve the brush seal of aforementioned type, form the brush seal structure with low hysteresis energy, make it in the situations such as larger pressure reduction, strong turbulent flow, high rotor skew, there is good seal performance and working life.
Technological scheme of the present invention: a kind of low hysteresis, around solid type brush seal installation, comprising: brush ring, brush seal seat 2, collar 4; Brush ring is by brushing tow assembly, front screen 7, and backboard 3 forms; Brush tow assembly forms by brushing silk 8, heart yearn 5, sleeve pipe 6; By collar 4, brush ring is fixed on sealing seat 2, form turn, contact sealing between stator; Sleeve pipe 6 has equally distributed sleeve pipe bleed groove 9, brush tow 8 is wound on heart yearn 5 at an angle, and be fixed by sleeve pipe 6 clampings, sleeve pipe clamps stressed both sides and is designed with direction leading edge 10, under initial installment state with y to forming drift angle, so that brush tow free end and backboard sealing dam 11 keep laminating, formation has the secondary of initial contact stress and obturages; The brush ring stream of obturaging is isolated into hyperbaric chamber PH, low-pressure cavity PL, forms P1, two chambeies of P2 in brush seal simultaneously, by sleeve pipe bleed groove 9, the pressurized gas in P1 chamber is introduced to P2 mineralization pressure counter balance pocket; Backboard 3 internal diameters are greater than rotor 1 external diameter, between the gap that forms be backboard protection height H 2, front screen internal diameter and rotor outer rim distance H 1 are slightly larger than H2; Brush tow laminating backboard sealing dam 11, and stretch out until contact with rotor 1 cylindrical, form to contact and obturage;
8 hypsokinesis of brush tow are to carry out angle control and angle limits by the direction leading edge 10 on sleeve pipe 6, and direction leading edge 10, makes to brush tow 8 and fits with sealing dam 11 to forming 8～15 ° of angles with y; For reducing the area of contact on the sealing dam 11 of brushing tow 8 and backboard 3, the width L2 on sealing dam 11 is unsuitable excessive, should be within the scope of 0.7～1.5mm; The freedom length L1 of brush tow 8 is within the scope of 10～15mm; Backboard protection height H 2 should not be less than 1mm, and front screen internal diameter and rotor outer rim distance H 1 should not be less than H2;
Front screen 7, backboard 3 clamp brush tow assembly, and brush tow and heart yearn transverse section (xoy plane) are 45° angle and are wound around heart yearn 5, and with sleeve pipe 6, form brush ring by its direction leading edge 10 clamping brush tow 8; It is the direction leading edge 10 of 1～3mm that sleeve pipe 6 is designed with length; Sleeve pipe bleed groove 9, it is of a size of wide 10～15mm, dark 0.2～0.3mm, circumferentially uniform 8～16;
In the brush seal scheme of another kind of mineralization pressure counter balance pocket, sleeve pipe is not with the design of bleed groove, but on forward and backward baffle plate, the Position Design bleed groove of clamping brush tow assembly; Front screen 7, by the boss 12 of circumferential uniform 8 wide 20mm, high 0.2～0.3mm, forms 8 sections of front screen bleed grooves 13 between boss, and backboard 3 is at the backboard bleed groove 14 of clamping brush ring position processing 8 sections of wide 20mm, dark 0.2～0.3mm.
Beneficial effect of the present invention: seal arrangement of the present invention can adapt to larger operating conditions, for the height pressure reduction of obturaging, due to the pressure balance effect of pressure balance chamber, the flexibility of brush tow lowers less, makes the design load of its rigidity basic controlling under initial installation conditions; The servo-actuated performance of brush silk is subject to operating infulence less, and seal performance, the working life of sealing are also more stable; Reduce processing cost around solid type brush seal structure compared with solder type, be also applicable to the selection of nonmetal brush wire material simultaneously, for the oil/gas such as the bearing bore seal arrangement that provides new of obturaging is selected.
Brief description of the drawings
Fig. 1 is the structural representation of the low hysteresis of the present invention around solid type brush seal embodiment one;
Fig. 2 is that embodiment one brush tow assembly forms the schematic diagram before brush ring;
Fig. 3 is the structural representation of the low hysteresis of the present invention around solid type brush seal embodiment two;
Fig. 4 is forward and backward baffle plate bleed groove distribution schematic diagram of the embodiment two.
Wherein, 1-rotor, 2-sealing seat, 3-backboard, 4-collar, 5-heart yearn, 6-sleeve pipe, 7-front screen, 8-brush silk (bundle), 9-sleeve pipe bleed groove, 10-direction leading edge, 11-seals dam, 12-boss, 13-front screen bleed groove, 14-backboard bleed groove.
Embodiment
Below by embodiment, the present invention is described in further detail:
Fig. 1 shows low hysteresis around solid type brush seal structure embodiment one.By collar 4, brush ring is fixed on sealing seat 2, forms the contact sealing between rotor 1, stator.Taking rotor axis direction as x to, perpendicular to rotor axis be radially y to.Brush seal mainly comprises collar 4, brush ring, sealing seat 2.Brush ring is by front screen 7, backboard 3, brush tow module composition.Brush tow assembly forms by brushing silk 8, heart yearn 5, sleeve pipe 6.
Stream is divided into hyperbaric chamber PH, low-pressure cavity PL by brush seal.Meanwhile, the air-flow that the front screen 7 of brush seal assembly, brush tow, backboard 3 make again to flow through in brush seal forms current stabilization chamber P1 and pressure balance chamber P2.
Sleeve pipe has equally distributed sleeve pipe bleed groove 9, brush tow 8 is wound on heart yearn 5 at an angle, and be fixed by sleeve pipe 6 clampings, sleeve pipe clamps stressed both sides and is designed with direction leading edge 10, under initial installment state, direction leading edge 10, with y to forming drift angle, keeps laminating so that brush tow free end with sealing dam.By sleeve pipe bleed groove 9 uniform on sleeve pipe, the pressurized gas in the P1 of current stabilization chamber are introduced to mineralization pressure counter balance pocket in P2.
The gap that backboard internal diameter and rotor outer surface form is backboard protection height H 2, and the gap H1 that front screen and rotor outer surface form is not less than H2.Enter the pressurized gas of P1 by H1, play a part to reduce Vortex Disturbance, steady air flow, eddy current is reduced the upset impact of brush silk, avoid brushing the irregular damage in tow working procedure.
The inner edge of backboard contacts with brush tow the sealing dam 11 forming, and plays secondary seal effect, and its width is unsuitable excessive, is 0.7～1.5mm.Front screen inner edge is closely brushed the projection of a side, plays the gas flow effect that restriction enters current stabilization chamber.
Fig. 2 shows brush tow assembly and bends to the schematic diagram before brush ring, comprises heart yearn 5, sleeve pipe 6, brush silk 8.On sleeve pipe, be processed with the sleeve pipe bleed groove 9 being equally spaced.Brush silk is 45° angle with heart yearn transverse section (xoy plane) and is wound on heart yearn 5, and clamps by sleeve pipe 6.Direction leading edge 10 clamping brush silks relatively zoy plane tilt 8～15 °.
Fig. 3 shows low hysteresis around solid type brush seal structure embodiment two.Sleeve pipe 6 is not with the design of bleed groove, but on forward and backward baffle plate, the Position Design bleed groove of clamping brush tow assembly.
Fig. 4 shows the boss of the front screen 7 of low hysteresis in solid type brush seal structure embodiment two, the bleed groove distribution schematic diagram of backboard 3.Front screen 7, by the boss 12 of circumferential uniform 8 wide 20mm, high 0.2～0.3mm, forms 8 sections of front screen bleed grooves 13 between boss, and backboard 3 is at the backboard bleed groove 14 of clamping brush ring position processing 8 sections of wide 20mm, dark 0.2～0.3mm.
The present invention provides portion size parameter value or the span of low hysteresis around solid type brush seal structure, it should be noted that dimensional parameters choose should design according to brush seal, usage requirement, after structural strength, performance, life appraisal, carry out comprehensive selection choice.Meanwhile, the present invention provides the two kind embodiments of low hysteresis around solid type brush seal, is not departing under the identical low hysteresis energy design principle of the present invention's narration, can carry out variations and modifications and form multiple embodiments.
Claims (4)
1. low hysteresis, around a solid type brush seal installation, comprising: brush ring, brush seal seat (2), collar (4); Brush ring is by brushing tow assembly, front screen (7), backboard (3) composition; Brush tow assembly by brushing silk (8), a heart yearn (5), sleeve pipe (6) forms; By collar (4), brush ring is fixed on to sealing seat (2) upper, form turn, contact sealing between stator,
It is characterized in that, described sleeve pipe (6) has equally distributed sleeve pipe bleed groove (9), brush tow (8) is wound on heart yearn (5) at an angle, and be fixed by sleeve pipe (6) clamping, sleeve pipe clamps stressed both sides and is designed with direction leading edge (10), under initial installment state, form drift angle with the radially y perpendicular to rotor axis, so that brush tow free end and backboard sealing dam (11) keep laminating, formation has the secondary of initial contact stress and obturages; The brush ring stream of obturaging is isolated into hyperbaric chamber PH, low-pressure cavity PL, forms P1, two chambeies of P2 in brush seal simultaneously, by sleeve pipe bleed groove (9), the pressurized gas in P1 chamber is introduced to P2 chamber mineralization pressure counter balance pocket; Backboard (3) internal diameter is greater than rotor (1) external diameter, between the gap that forms be backboard protection height H 2, front screen internal diameter and rotor outer rim distance H 1 are slightly larger than H2; Brush tow laminating backboard sealing dam (11), and stretch out until contact with rotor (1) cylindrical, form to contact and obturage.
2. low hysteresis as claimed in claim 1 is around solid type brush seal installation, it is characterized in that, the hypsokinesis of brush tow (8) is carried out angle control and angle limits by the direction leading edge (10) on sleeve pipe (6), direction leading edge (10) forms 8～15 ° of angles with the radially y perpendicular to rotor axis, makes to brush tow (8) and sealing dam (11) laminating; The width L2 on sealing dam (11) is within the scope of 0.7～1.5mm; The freedom length L1 of brush tow (8) is within the scope of 10～15mm; Backboard protection height H 2 is not less than 1mm, and front screen internal diameter and rotor outer rim distance H 1 are not less than H2.
3. low hysteresis as claimed in claim 2, around solid type brush seal installation, is characterized in that, described brush tow (8) is 45° angle with heart yearn transverse section and is wound around heart yearn (5); Sleeve pipe (6) is designed with the direction leading edge (10) that length is 1～3mm; Sleeve pipe bleed groove (9) is of a size of wide 10～15mm, dark 0.2～0.3mm, circumferentially uniform 8～16.
4. low hysteresis as claimed in claim 1 is around solid type brush seal installation, it is characterized in that, front screen (7) is by the boss (12) of circumferential uniform 8 wide 20mm, high 0.2～0.3mm, between boss, form 8 sections of front screen bleed grooves (13), backboard (3) is at the backboard bleed groove (14) of clamping brush ring position processing 8 sections of wide 20mm, dark 0.2～0.3mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110458368.9A CN102425461B (en) | 2011-12-27 | 2011-12-27 | Low-hysteresis reeled and fixed brush type sealing device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110458368.9A CN102425461B (en) | 2011-12-27 | 2011-12-27 | Low-hysteresis reeled and fixed brush type sealing device |
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| CN102425461A CN102425461A (en) | 2012-04-25 |
| CN102425461B true CN102425461B (en) | 2014-07-09 |
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| CN201110458368.9A Active CN102425461B (en) | 2011-12-27 | 2011-12-27 | Low-hysteresis reeled and fixed brush type sealing device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109751091A (en) * | 2019-01-21 | 2019-05-14 | 中国航发湖南动力机械研究所 | Brush seal installation |
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| US8919633B2 (en) * | 2012-01-04 | 2014-12-30 | General Electric Company | Seal assembly and method for assembling a turbine |
| CN104047640B (en) * | 2014-06-10 | 2015-11-18 | 清华大学 | A kind of brush seal structure of adjustable radial gap |
| CN104454030A (en) * | 2014-11-14 | 2015-03-25 | 中国航空动力机械研究所 | High-pressure-resisting low-hysteresis brush type sealing device |
| CN108979739A (en) * | 2018-08-20 | 2018-12-11 | 辽宁天航空科技有限公司 | Brush seal |
| CN111120113B (en) * | 2018-10-30 | 2021-03-19 | 中国联合重型燃气轮机技术有限公司 | Gas turbine and non-contact fingertip sealing device thereof |
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| CN111927565B (en) * | 2020-07-21 | 2022-03-25 | 中国航发湖南动力机械研究所 | Sealing device for sealing oil and discharging sand |
| CN112324698B (en) * | 2020-11-03 | 2022-03-04 | 中国航发沈阳发动机研究所 | Air-entraining sealing device and air compressor air-entraining sealing structure thereof |
| CN114343322B (en) * | 2021-12-15 | 2023-07-21 | 中国科学院金属研究所 | Brush filament bundle sample manufacturing device capable of simulating brush filament ring structure in aero-engine |
| CN114991884B (en) * | 2022-06-02 | 2023-12-22 | 中国科学院工程热物理研究所 | Arch brush wire brush type sealing structure for reducing actual gap by utilizing brush wire deformation |
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| DE19712088C2 (en) * | 1997-03-22 | 1999-06-24 | Mtu Muenchen Gmbh | Brush seal with bristles inclined in the circumferential direction |
| DE19720649C2 (en) * | 1997-05-16 | 2000-09-28 | Mtu Muenchen Gmbh | Brush seal |
| DE10337867B4 (en) * | 2003-08-18 | 2020-04-23 | MTU Aero Engines AG | Brush seal |
| JP2005337448A (en) * | 2004-05-28 | 2005-12-08 | Toshiba Corp | Brush sealing device |
| GB0423923D0 (en) * | 2004-10-28 | 2004-12-01 | Rolls Royce Plc | Segmented annular seal for a gas turbine engine |
| CN201778841U (en) * | 2010-09-08 | 2011-03-30 | 杭州华电半山发电有限公司 | Axial slanting brush type vapor seal ring |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109751091A (en) * | 2019-01-21 | 2019-05-14 | 中国航发湖南动力机械研究所 | Brush seal installation |
| CN109751091B (en) * | 2019-01-21 | 2022-04-01 | 中国航发湖南动力机械研究所 | Brush type sealing device |
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| CN102425461A (en) | 2012-04-25 |
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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 Jiangyou 305, Sichuan Province Patentee before: CHINA GAS TURBINE EST |