CN108757052B - High-pressure fingertip and carbon fiber brush wire combined sealing device - Google Patents
High-pressure fingertip and carbon fiber brush wire combined sealing device Download PDFInfo
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- CN108757052B CN108757052B CN201810411372.1A CN201810411372A CN108757052B CN 108757052 B CN108757052 B CN 108757052B CN 201810411372 A CN201810411372 A CN 201810411372A CN 108757052 B CN108757052 B CN 108757052B
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- carbon fiber
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/003—Preventing or minimising internal leakage of working-fluid, e.g. between stages by packing rings; Mechanical seals
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- General Engineering & Computer Science (AREA)
- Sealing Devices (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
The invention discloses a high-pressure fingertip and carbon fiber brush wire combined sealing device which comprises a front baffle, a high-pressure fingertip sealing sheet, a low-pressure fingertip sealing sheet, a carbon fiber brush bundle body and a rear baffle, wherein the high-pressure fingertip sealing sheet is positioned on the inner side of the front baffle, the low-pressure fingertip sealing sheet is positioned on the side part of the high-pressure fingertip sealing sheet, the carbon fiber brush bundle body is positioned on the side part of the low-pressure fingertip sealing sheet, the rear baffle of the carbon fiber brush bundle body is contacted with the rear baffle, the high-pressure fingertip sealing sheet, the low-pressure fingertip sealing sheet and the outer diameter root part of the carbon fiber brush bundle body are connected into a whole through a fusion welding process and clamped between the front baffle and the rear baffle to form a fusion welding area, the fingertip baffle is arranged between the low-pressure. The high-pressure fingertip sealing sheet in the brush type sealing device has good high-pressure resistance, the carbon fiber brush wire has self-lubricating property, abrasion between the brush wire and a rotor is reduced, and the brush wire is long in service life.
Description
Technical Field
The invention belongs to the technical field of sealing devices, and particularly relates to a high-pressure fingertip and carbon fiber brush wire combined sealing device.
Background
Most of the traditional sealing devices are comb tooth sealing, and if the mounting clearance is too small, the static and dynamic parts are easy to collide and rub, and the equipment is damaged; if the installation clearance is too large, the leakage is increased, the sealing requirement cannot be met, the grate is easy to wear, and the leakage amount is gradually increased along with the extension of the operation time of the equipment. The brush type sealing device is a contact sealing, is an advanced dynamic sealing technology which is installed in a zero clearance mode, can obviously improve the working efficiency and reliability of a high-power steam turbine, and is an ideal updating product of the traditional labyrinth sealing.
Generally, a brush seal is composed of a protective shield, a flexible filament body, and a support shield. The flexible brush filament body is composed of closely spaced elongated metal filaments, typically of a nickel-based or cobalt-based alloy. However, the brush wire of the brush type sealing structure is easy to break, and when the brush type sealing structure works, the brush wire and the rotor generate high-speed friction, the brush wire is continuously abraded and burnt, and the sealing performance of the brush type seal and the service life of the brush wire are influenced. The carbon fiber is a high-performance fiber material and is widely applied to the fields of aerospace, energy equipment, transportation and the like. The carbon fiber brush wire provided by the invention can effectively avoid the defects of the traditional brush seal, and can improve the performance of the brush seal and prolong the service life of the brush wire.
In addition, the brush type seal has the characteristics of low leakage rate, small axial space occupation, excellent rotor dynamic performance, lasting and stable operation and the like, but the brush wire is easy to axially deform under high pressure difference, so that the seal failure is caused. Therefore, the sealing device combining the high-pressure fingertips and the carbon fiber brush wires is adopted to improve the performance of the brush seal and prolong the service life of the brush wires.
Disclosure of Invention
The invention aims to provide a high-pressure fingertip and carbon fiber brush wire combined sealing device, which solves the problem that the existing brush type seal is large in axial deformation under high pressure difference.
The technical scheme includes that the high-pressure fingertip and carbon fiber brush wire combined sealing device comprises a front baffle, a high-pressure fingertip sealing sheet, a low-pressure fingertip sealing sheet, a fusion welding area, a carbon fiber brush bundle body and a rear baffle, wherein the high-pressure fingertip sealing sheet is located on the inner side of the front baffle, the low-pressure fingertip sealing sheet is located on the side portion of the high-pressure fingertip sealing sheet, the carbon fiber brush bundle body is located on the side portion of the low-pressure fingertip sealing sheet, the carbon fiber brush bundle body is in contact with the rear baffle, the high-pressure fingertip sealing sheet, the low-pressure fingertip sealing sheet and the carbon fiber brush bundle body are connected into a whole through a fusion welding process and clamped between the front baffle and the rear baffle to form the fusion welding area, the fingertip baffle is arranged between the low-pressure fingertip sealing sheet and the carbon fiber brush bundle body, and the.
The present invention is also characterized in that,
a flow shielding plate is arranged between the front baffle and the high-pressure fingertip sealing sheet.
The flow shielding plate is of an annular structure, and a plurality of V-shaped gaps are formed in the flow shielding plate along the circumferential direction.
The surface of the rear baffle close to the carbon fiber brush bundle body is provided with an annular pressure reduction groove.
The axial thickness of the high-pressure fingertip sealing piece is 3-4 mm, and the axial thickness of the low-pressure fingertip sealing piece is 0.2-0.4 mm.
The carbon fiber brush bundle body is composed of a plurality of rows of carbon fiber brush wires which are uniformly and vertically arranged, the diameter of each carbon fiber brush wire is 0.03-0.05 mm, and the total axial thickness of the carbon fiber brush bundle body is 0.3-5 mm.
A plurality of grooves are uniformly formed in the inner ring surface of the fingertip baffle along the circumferential direction, and the depth of each groove is 0.2-0.4 mm.
The high-pressure fingertip sealing sheet in the brush type sealing device has the beneficial effects that the high-pressure fingertip sealing sheet has better high-pressure resistance, the axial deformation of the brush wire under high pressure is effectively reduced, the carbon fiber brush wire has self-lubricating property, the abrasion between the brush wire and a rotor can be reduced, and the service life of the brush wire is long.
Drawings
FIG. 1 is a schematic structural diagram of a high-pressure fingertip and carbon fiber brush wire combined sealing device of the present invention;
FIG. 2 is a schematic structural diagram of a high-pressure fingertip sealing sheet in the high-pressure fingertip and carbon fiber brush wire combined sealing device of the present invention;
FIG. 3 is a partial enlarged view of the structure of a high-pressure fingertip sealing sheet in the high-pressure fingertip and carbon fiber brush wire combined sealing device of the invention;
FIG. 4 is a schematic structural view of a low-pressure fingertip sealing sheet in the high-pressure fingertip and carbon fiber brush wire combined sealing device of the present invention;
FIG. 5 is a schematic structural view of a fingertip baffle plate in the high-pressure fingertip and carbon fiber brush wire combined sealing device of the present invention;
FIG. 6 is a schematic enlarged view of a finger tip baffle of the high-pressure finger tip and carbon fiber brush filament combined sealing device of the present invention;
FIG. 7 is a schematic structural diagram of a carbon fiber brush wire in a high-pressure fingertip and carbon fiber brush wire combined sealing device according to the present invention;
fig. 8 is a schematic structural view of a flow shielding plate in the high-pressure fingertip and carbon fiber brush filament combined sealing device of the present invention.
In the figure, 1, a front baffle, 2, a flow shielding plate, 21, a V-shaped gap, 3, a high-pressure fingertip sealing piece, 31, a first fingertip beam, 32, a second fingertip beam gap, 4, a low-pressure fingertip sealing piece, 41, a fingertip beam, 42, a fingertip beam gap, 5, a fusion welding area, 6, a fingertip baffle, 7, a carbon fiber brush bundle body, 71, a carbon fiber brush wire, 8, a rear baffle and 9, a rotor are arranged.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention relates to a high-pressure fingertip and carbon fiber brush wire combined sealing device, which comprises a front baffle plate 1, a high-pressure fingertip sealing sheet 3, a low-pressure fingertip sealing sheet 4, a fusion welding area 5, a carbon fiber brush bundle body 7 and a rear baffle plate 8, wherein the high-pressure fingertip sealing sheet 3 is positioned at the inner side of the front baffle plate 1, the low-pressure fingertip sealing sheet 4 is positioned at the side part of the high-pressure fingertip sealing sheet 3, the carbon fiber brush bundle body 7 is positioned at the side part of the low-pressure fingertip sealing sheet 4, the carbon fiber brush bundle body 7 is contacted with the rear baffle plate 8, the outer diameter root parts of the high-pressure fingertip sealing sheet 3, the low-pressure fingertip sealing sheet 4 and, and the welding zone 5 is formed by clamping the front baffle 1 and the rear baffle 8, the fingertip baffle 6 is arranged between the low-pressure fingertip sealing sheet 4 and the carbon fiber brush bundle body 7, and the front baffle 1, the fingertip baffle 6, the carbon fiber brush bundle body 7 and the rear baffle 2 are all sleeved on the rotor 9.
The front baffle 1, the fingertip baffle 6 and the rear baffle 8 are all in an annular structure.
The high-pressure fingertip seal piece 3 comprises a first fingertip beam 31 and a second fingertip beam gap 32, as shown in fig. 2 and 3, the number of the first fingertip beams 31 is 50-70, and the low-pressure fingertip seal piece 4 comprises a second fingertip beam 41 and a second fingertip beam gap 42, as shown in fig. 4; the axial thickness of the high-pressure fingertip sealing piece 3 is 3 mm-4 mm, and the axial thickness of the low-pressure fingertip sealing piece 4 is 0.2 mm-0.4 mm;
a plurality of grooves are uniformly formed in the inner annular surface of the fingertip baffle 6 along the circumferential direction, as shown in fig. 5 and 6, the depth of each groove is 0.2 mm-0.4 mm, and the shape of each groove is the same as that of the second fingertip beam 41;
the total axial thickness of the carbon fiber brush bundle body 7 is 0.3 mm-5 mm, the carbon fiber brush bundle body 7 is composed of a plurality of rows of carbon fiber brush wires 71 which are uniformly and vertically arranged, and as shown in fig. 7, the diameter of each carbon fiber brush wire 71 is 0.03 mm-0.05 mm.
A current-shielding plate 2 is arranged between the front baffle 1 and the high-pressure fingertip sealing piece 3, the current-shielding plate 2 is of an annular structure, a plurality of V-shaped slits 21 are formed in the inner annular surface of the current-shielding plate 2 along the circumferential direction, as shown in FIG. 8, the thickness of the current-shielding plate 2 is 0.60 mm-0.90 mm, and the maximum width of each V-shaped slit 21 is 0.90 mm-1.1 mm; the inner diameter of the baffle plate 2 is between the inner diameter of the front baffle plate 1 and the inner diameter of the high-pressure fingertip sealing piece 3.
The surface of the rear baffle 8 close to the carbon fiber brush bundle body 7 is provided with a pressure reduction groove, the pressure reduction groove is of an annular structure, and the depth of the pressure reduction groove is 0.20 mm-0.60 mm.
The thickness of the front baffle 1 is not greater than the thickness of the rear baffle 8.
The invention relates to a high-pressure fingertip and carbon fiber brush wire combined sealing device, which specifically adopts the working principle that:
during operation, when gas flows to backplate 8 through preceding baffle 1 through the high pressure side in upper reaches, partial high-pressure draught can blow to on hiding a class 2, and then flow to high-pressure finger tip gasket 3, also can flow to high-pressure finger tip gasket 3 through the gap that hides on class 2, after gaseous high-pressure finger tip gasket 3, produce a part pressure drop, rethread low pressure indicates sharp gasket 4 and carbon fiber brush bundle body 7, can reduce the pressure that carbon fiber brush bundle body 7 bore like this, prevent that carbon fiber brush bundle body 7 from taking place great axial deformation under the high differential pressure.
The carbon fiber brush wires 71 in the device are uniformly and vertically arranged, and the carbon fiber brush wires 71 are easy to adapt to the thermal deformation of the rotor 9, so that the abrasion of the carbon fiber brush wires 71 is reduced, and the service life of the brush wires is prolonged; meanwhile, after the shaft is subjected to instantaneous large radial displacement, the carbon fiber brush wires 71 can rebound and keep the sealing gap unchanged. Compared with the traditional metal brush wire sealing device, the carbon fiber brush wire 71 has smaller diameter, so that the pores between the brush wires are effectively reduced, and in addition, the high-speed friction between the brush wires and the rotor 9 can be reduced due to the good wear resistance of the carbon fiber brush wire 71, so that the sealing performance is improved.
The flow shielding plate 2 is of an annular structure, and a plurality of V-shaped gaps or a plurality of round holes are formed in the flow shielding plate 2 along the circumferential direction, so that the pressure borne by the flow shielding plate 2 is reduced, and the normal work of the flow shielding plate is ensured. In the embodiment, the baffle 2 is provided with a seam structure and a hole; when the baffle plate 2 is contacted with the high-pressure air flow, the buffering effect is improved.
Because the existence of the pressure relief groove, the contact surface between the rear baffle plate 8 and the carbon fiber brush bundle body 7 is reduced, and when the device works, the friction force between the rear baffle plate 8 and the bristles of the carbon fiber brush bundle body 7 is reduced, the phenomenon that the carbon fiber brush bundle body 7 cannot recover to the initial position due to overlarge friction force is avoided, a hysteresis effect is caused, the reduction of the gap between the carbon fiber brush bundle body 7 and the rotor 9 is facilitated, the leakage caused by the hysteresis effect is prevented, and the sealing performance is further improved. Meanwhile, the abrasion between the rear baffle plate 8 and the carbon fiber brush bundle body 7 can be reduced, and the service life of the carbon fiber brush bundle body is prolonged.
The high-pressure fingertip sealing sheet 3 has larger axial thickness and higher pressure bearing capacity which can reach 2 Mpa-3 Mpa; meanwhile, the sealing device combining the high-pressure fingertip sealing sheet 3 and the carbon fiber brush bundle body 7 can avoid the brush wire from generating larger axial deformation under the high pressure difference working condition, and improves the sealing performance on the basis of not reducing the flexibility of a fingertip sealing and brush type sealing structure.
Claims (5)
1. The high-pressure fingertip and carbon fiber brush wire combined sealing device is characterized by comprising a front baffle (1), a high-pressure fingertip sealing sheet (3), a low-pressure fingertip sealing sheet (4), a fusion welding area (5), a carbon fiber brush bundle body (7) and a rear baffle (8), wherein the high-pressure fingertip sealing sheet (3) is positioned at the side part of the front baffle (1), the low-pressure fingertip sealing sheet (4) is positioned at the side part of the high-pressure fingertip sealing sheet (3), the carbon fiber brush bundle body (7) is positioned at the side part of the low-pressure fingertip sealing sheet (4), the carbon fiber brush bundle body (7) is contacted with the rear baffle (8), the outer diameter roots of the high-pressure fingertip sealing sheet (3), the low-pressure fingertip sealing sheet (4) and the carbon fiber brush bundle body (7) are connected into a whole through fusion welding technology and clamped between the front baffle (1) and the rear baffle (8) to form the fusion welding area (, a fingertip baffle (6) is arranged between the low-pressure fingertip sealing sheet (4) and the carbon fiber brush bundle body (7), and the front baffle (1), the fingertip baffle (6), the carbon fiber brush bundle body (7) and the rear baffle (8) are all sleeved on the rotor (9);
a flow shielding plate (2) is arranged between the front baffle (1) and the high-pressure fingertip sealing piece (3), the flow shielding plate (2) is of an annular structure, and a plurality of V-shaped gaps (21) are formed in the inner annular surface of the flow shielding plate (2) along the circumferential direction.
2. The combined sealing device of the high-pressure fingertip and the carbon fiber brush wire as claimed in claim 1, wherein an annular pressure relief groove is formed in the surface of the rear baffle (8) close to the carbon fiber brush bundle body (7).
3. The combined sealing device of the high-pressure fingertip and carbon fiber brush wire according to claim 1, wherein the axial thickness of the high-pressure fingertip sealing piece (3) is 3mm to 4mm, and the axial thickness of the low-pressure fingertip sealing piece (4) is 0.2mm to 0.4 mm.
4. The high-pressure fingertip and carbon fiber brush wire combined sealing device is characterized in that the carbon fiber brush bundle body (7) is composed of a plurality of rows of carbon fiber brush wires (71) which are uniformly and vertically arranged, the diameter of each carbon fiber brush wire (71) is 0.03 mm-0.05 mm, and the total axial thickness of the carbon fiber brush bundle body (7) is 0.3 mm-5 mm.
5. The high-pressure fingertip and carbon fiber brush wire combined sealing device according to claim 1, wherein a plurality of grooves are uniformly formed in the inner annular surface of the fingertip baffle plate (6) along the circumferential direction, and the depth of each groove is 0.2 mm-0.4 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810411372.1A CN108757052B (en) | 2018-05-02 | 2018-05-02 | High-pressure fingertip and carbon fiber brush wire combined sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810411372.1A CN108757052B (en) | 2018-05-02 | 2018-05-02 | High-pressure fingertip and carbon fiber brush wire combined sealing device |
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| Publication Number | Publication Date |
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| CN108757052A CN108757052A (en) | 2018-11-06 |
| CN108757052B true CN108757052B (en) | 2020-10-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810411372.1A Active CN108757052B (en) | 2018-05-02 | 2018-05-02 | High-pressure fingertip and carbon fiber brush wire combined sealing device |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112161062B (en) * | 2020-09-27 | 2022-08-09 | 中国航发湖南动力机械研究所 | Combined sealing structure |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6502823B1 (en) * | 2001-12-07 | 2003-01-07 | General Electric Company | Actuating seal carrier for a turbine and method of retrofitting |
| CN1469065A (en) * | 2002-06-27 | 2004-01-21 | ͨ�õ�����˾ | Multi-core brush type sealing assembly for rotary machinery |
| CN103711527A (en) * | 2014-01-17 | 2014-04-09 | 清华大学 | Brush type sealing and fingertip sealing combined seal |
| CN104153826A (en) * | 2014-07-28 | 2014-11-19 | 江苏透平密封高科技有限公司 | Flow-shielding brush-type steam seal |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060214378A1 (en) * | 2005-03-28 | 2006-09-28 | Xiaoqing Zheng | Brush seal with spiral groove back plate |
-
2018
- 2018-05-02 CN CN201810411372.1A patent/CN108757052B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6502823B1 (en) * | 2001-12-07 | 2003-01-07 | General Electric Company | Actuating seal carrier for a turbine and method of retrofitting |
| CN1469065A (en) * | 2002-06-27 | 2004-01-21 | ͨ�õ�����˾ | Multi-core brush type sealing assembly for rotary machinery |
| CN103711527A (en) * | 2014-01-17 | 2014-04-09 | 清华大学 | Brush type sealing and fingertip sealing combined seal |
| CN104153826A (en) * | 2014-07-28 | 2014-11-19 | 江苏透平密封高科技有限公司 | Flow-shielding brush-type steam seal |
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| CN108757052A (en) | 2018-11-06 |
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Effective date of registration: 20230525 Address after: 710000 No. 26, gazelle Road, high tech Zone, Xi'an, Shaanxi Patentee after: Xi'an Polytechnic Asset Management Co.,Ltd. Address before: 710048 No. 5 Jinhua South Road, Shaanxi, Xi'an Patentee before: XI'AN University OF TECHNOLOGY Effective date of registration: 20230525 Address after: Room 408, A2 Comprehensive Office Building, Shaanxi Helicopter Industry Development Park, No. 858 Shenzhou 6th Road, National Civil Aerospace Industry Base, Xi'an City, Shaanxi Province, 710000 Patentee after: Xi'an Aviation High end Sealing Technology Co.,Ltd. Address before: 710000 No. 26, gazelle Road, high tech Zone, Xi'an, Shaanxi Patentee before: Xi'an Polytechnic Asset Management Co.,Ltd. |
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