CN108979740B - Low-abrasion labyrinth-brush type composite sealing device - Google Patents
Low-abrasion labyrinth-brush type composite sealing device Download PDFInfo
- Publication number
- CN108979740B CN108979740B CN201811024501.8A CN201811024501A CN108979740B CN 108979740 B CN108979740 B CN 108979740B CN 201811024501 A CN201811024501 A CN 201811024501A CN 108979740 B CN108979740 B CN 108979740B
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- Prior art keywords
- brush
- bearings
- labyrinth
- ring
- fusion welding
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- 238000007789 sealing Methods 0.000 title claims abstract description 32
- 239000002131 composite material Substances 0.000 title claims abstract description 11
- 238000005299 abrasion Methods 0.000 title abstract description 14
- 230000004927 fusion Effects 0.000 claims abstract description 24
- 238000003466 welding Methods 0.000 claims abstract description 24
- 238000005452 bending Methods 0.000 claims abstract description 6
- 238000005516 engineering process Methods 0.000 claims abstract description 6
- 230000006837 decompression Effects 0.000 claims abstract description 5
- 238000005096 rolling process Methods 0.000 claims description 4
- 230000001680 brushing effect Effects 0.000 abstract description 8
- 230000002035 prolonged effect Effects 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 4
- 239000012530 fluid Substances 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
Classifications
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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
-
- 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
- F01D11/02—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/08—Sealings
- F04D29/083—Sealings especially adapted for elastic fluid pumps
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Sealing Devices (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
The invention relates to a labyrinth-brush type composite sealing device with low abrasion, and belongs to the technical field of mechanical sealing. The invention comprises labyrinth teeth, a bearing, a front baffle, a brush wire bundle, a rear baffle, a fusion welding area, a shaft sleeve and a rotor; the root of the brush filament bundle, the front baffle plate and the rear baffle plate form fusion welding areas through fusion welding technology, the rear baffle plate is provided with a decompression groove, the brush filament bundle is fixedly arranged between the front baffle plate and the rear baffle plate through the fusion welding areas to form a brush filament ring, the brush filament ring is arranged at the inner rings of the two bearings in an interference fit manner, the shaft sleeve is arranged between the two bearings, and the labyrinth teeth are arranged at the two sides of the brush filament ring and the bearings. The invention increases the bearing capacity, reduces the leakage quantity and improves the sealing performance; the brush wire ring of the sealing device can rotate through the bearing, so that the friction and abrasion between the end part of the brush wire bundle and the rotor can be effectively reduced, and the service life of the brush wire can be prolonged; the two bearings are connected with the shaft sleeve, so that the bending moment borne by the wire brushing ring due to uneven leakage gas is solved, and the service life is prolonged.
Description
Technical Field
The invention relates to a labyrinth-brush type composite sealing device with low abrasion, and belongs to the technical field of mechanical sealing.
Background
In turbomachinery such as aeroengines and gas turbines, it is often necessary to seal the fluid between the rotating and stationary parts. Labyrinth seals and brush seals are currently used in turbomachinery. Both wear life and leakage problems are the two most important indicators of sealing. The labyrinth seal has larger bearing capacity, but the leakage rate of the labyrinth seal is larger because a certain gap is generally formed between the labyrinth teeth and the rotor; the leakage amount of the brush type seal is only 10% -20% of that of the labyrinth seal, but the brush wire tips of the brush type seal are in contact with the rotor generally, and friction heat generation is generated to cause larger abrasion.
The sealing principle of brush type sealing is that tens of thousands of brush wires which are compactly arranged play a role in preventing the flow of upstream and downstream fluid, and a large number of brush wire tips are contacted with a rotor to generate frictional thermal abrasion. The friction heat is related to the friction coefficient, the brush wire tip force and the rotor surface linear speed, and the current means for reducing the friction and abrasion of the brush wire bundle and the rotor are mainly as follows: the brush filament bundle with low friction coefficient and the rotor coating matched material are selected, but the cost is higher; the shape and size of the brush filament bundle are changed to reduce the tip force, etc., but the functional effect thereof is not obvious.
The labyrinth seal has the advantages of high bearing capacity, low leakage rate, reduced wear, high sealing performance, high reliability and long service life.
Disclosure of Invention
The invention aims to provide a labyrinth-brush type composite sealing device with low abrasion, which can effectively reduce abrasion of brush type sealing by utilizing the advantages of strong labyrinth sealing bearing capacity and low brush type sealing leakage rate so as to improve sealing reliability and service life.
The invention is realized according to the following technical scheme: a low-abrasion labyrinth-brush type composite sealing device comprises labyrinth teeth 1, a bearing 2, a front baffle plate 3, brush filament bundles 4, a rear baffle plate 5, a fusion welding area 6, a shaft sleeve 7 and a rotor 8; the root of the brush wire bundle 4 forms a fusion welding area 6 with the front baffle plate 3 and the rear baffle plate 5 through fusion welding technology, the rear baffle plate 5 is provided with a decompression groove, the brush wire bundle 4 is fixedly installed between the front baffle plate 3 and the rear baffle plate 5 through the fusion welding area 6 to form a brush wire ring 9, the end part of the brush wire bundle 4 is arranged on a rotor 8 of a machine through friction, the brush wire ring 9 is installed on the inner rings of the two bearings 2 in an interference fit manner, the shaft sleeve 7 is arranged between the two bearings 2, the labyrinth teeth 1 are arranged on two sides of the brush wire ring 9 and the bearings 2, and axial gaps are reserved between the labyrinth teeth 1 and the bearings 2.
The bearing 2 is a rolling bearing which can withstand radial and axial forces.
The inner ring of the shaft sleeve 7 is provided with a gap with the wire brushing ring 9, and the two bearings 2 and the shaft sleeve 7 are used for solving the bending moment of the wire brushing ring 9 caused by uneven airflow force.
The gap between the labyrinth teeth 1 and the rotor 8 is 1-2 mm, and the end part of the brush filament bundle 4 is in contact with the rotor 8 without gaps.
The working principle of the low-abrasion labyrinth-brush type composite sealing device is as follows: after the upstream high-pressure side pressure passes through the labyrinth sealing area, the brush sealing area and the labyrinth sealing area in sequence, the pressure can be greatly reduced, and the sealing effect is realized. The labyrinth sealing area is a labyrinth tooth 1; the root of the brush wire bundle 4, the front baffle plate 3 and the rear baffle plate 5 form a fusion welding area 6 through fusion welding technology, the whole body of the fusion welding area is arranged on the inner rings of the two bearings 2 in an interference fit manner, and a shaft sleeve 7 is arranged between the bearings 2 to form a brush sealing area; when the machine work rotor 8 rotates, the rotor 8 contacts with the end part of the brush filament bundle 4 to generate friction force, and the brush filament ring 9 can rotate along with the rotor 8 due to the effect of the bearing 2, so that friction can be effectively reduced due to the reduction of the relative speed between the surface of the rotor 8 and the end part of the brush filament bundle 4.
The invention has the following beneficial effects:
1. the sealing device combines the labyrinth seal and the brush seal together, so that the bearing capacity is increased, the leakage quantity is reduced, and the sealing performance is improved;
2. the brush wire ring of the sealing device can rotate through the bearing, so that the friction and abrasion between the end part of the brush wire bundle and the rotor can be effectively reduced, the service life of the brush wire can be prolonged, and compared with other structures capable of reducing brush type sealing abrasion, the effect is better;
3. the two bearings are connected with the shaft sleeve, so that the bending moment borne by the wire brushing ring due to uneven leakage gas is solved, and the service life is prolonged.
Drawings
FIG. 1 is a schematic diagram of the structure of the invention;
FIG. 2 is a schematic view of a partially enlarged structure of the present invention;
fig. 3 is a cross-sectional view taken along A-A of fig. 1.
The reference numerals in the figures are: 1: labyrinth teeth, 2: bearing, 3: front baffle, 4: brushing filament bundles, 5: a rear baffle plate, 6: fusion welding zone, 7: shaft sleeve, 8: rotor, 9: and (5) brushing a wire ring.
Detailed Description
The invention will be further described with reference to the drawings and examples, but the invention is not limited to the scope.
Example 1: as shown in fig. 1-3, a low-wear labyrinth-brush type composite sealing device comprises labyrinth teeth 1, a bearing 2, a front baffle plate 3, brush filament bundles 4, a rear baffle plate 5, a fusion welding zone 6, a shaft sleeve 7 and a rotor 8; the root of the brush wire bundle 4 forms a fusion welding area 6 with the front baffle plate 3 and the rear baffle plate 5 through fusion welding technology, the rear baffle plate 5 is provided with a decompression groove, the brush wire bundle 4 is fixedly installed between the front baffle plate 3 and the rear baffle plate 5 through the fusion welding area 6 to form a brush wire ring 9, the end part of the brush wire bundle 4 is arranged on a rotor 8 of a machine through friction, the brush wire ring 9 is installed on the inner rings of the two bearings 2 in an interference fit manner, the shaft sleeve 7 is arranged between the two bearings 2, the labyrinth teeth 1 are arranged on two sides of the brush wire ring 9 and the bearings 2, and the labyrinth teeth 1 and the bearings 2 have axial gaps.
The bearing 2 is a rolling bearing that can withstand radial and axial forces.
The inner ring of the shaft sleeve 7 is provided with a gap with the brush wire ring 9, and the two bearings 2 and the shaft sleeve 7 are used for solving the bending moment of the brush wire ring 9 caused by uneven airflow force.
The gap between the labyrinth teeth 1 and the rotor 8 is 1-2 mm, and the end part of the brush filament bundle 4 is in contact with the rotor 8 without gaps.
Example 2: as shown in fig. 1-3, a low-wear labyrinth-brush type composite sealing device comprises labyrinth teeth 1, a bearing 2, a front baffle plate 3, brush filament bundles 4, a rear baffle plate 5, a fusion welding zone 6, a shaft sleeve 7 and a rotor 8; the root of the brush wire bundle 4 forms a fusion welding area 6 with the front baffle plate 3 and the rear baffle plate 5 through fusion welding technology, the rear baffle plate 5 is provided with a decompression groove, the brush wire bundle 4 is fixedly installed between the front baffle plate 3 and the rear baffle plate 5 through the fusion welding area 6 to form a brush wire ring 9, the end part of the brush wire bundle 4 is arranged on a rotor 8 of a machine through friction, the brush wire ring 9 is installed on the inner rings of the two bearings 2 in an interference fit manner, the shaft sleeve 7 is arranged between the two bearings 2, the labyrinth teeth 1 are arranged on two sides of the brush wire ring 9 and the bearings 2, and axial gaps are reserved between the labyrinth teeth 1 and the bearings 2.
The bearing 2 is a rolling bearing that can withstand radial and axial forces.
The inner ring of the shaft sleeve 7 is provided with a gap with the wire brushing ring 9, and the shaft sleeve 7 is used for solving the bending moment of the wire brushing ring 9 caused by uneven airflow force.
The clearance between the labyrinth teeth 1 and the rotor 8 is 1.5mm, and the end part of the brush filament bundle 4 is in contact with the rotor 8 without clearance.
Claims (2)
1. A low wear labyrinth-brush composite sealing device, characterized by: the device comprises labyrinth teeth (1), a bearing (2), a front baffle (3), a brush silk bundle (4), a rear baffle (5), a fusion welding zone (6), a shaft sleeve (7) and a rotor (8); the root of the brush wire bundle (4) forms a fusion welding area (6) with the front baffle (3) and the rear baffle (5) through fusion welding technology, the rear baffle (5) is provided with a decompression groove, the brush wire bundle (4) is fixedly installed between the front baffle (3) and the rear baffle (5) through the fusion welding area (6) to form a brush wire ring (9), the end part of the brush wire bundle (4) is installed on a rotor (8) of a machine through friction, the brush wire ring (9) is installed on the inner ring of two bearings (2) in an interference fit manner, a shaft sleeve (7) is installed between the two bearings (2), labyrinth teeth (1) are installed on the two sides of the brush wire ring (9) and the bearings (2), the labyrinth teeth (1) are axially spaced with the bearings (2), the inner ring of the shaft sleeve (7) is spaced with the brush wire ring (9), the two bearings (2) are connected with the shaft sleeve (7) to be used for solving the problem that the bending moment born by the brush wire ring (9) due to uneven air flow force, the gap between the labyrinth teeth (1) and the rotor (8) is 1-2 mm, and the end part of the brush wire bundle (4) is in contact with the rotor (8).
2. The low wear labyrinth-brush composite seal of claim 1, wherein: the bearing (2) is a rolling bearing which can bear radial force and axial force.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811024501.8A CN108979740B (en) | 2018-09-04 | 2018-09-04 | Low-abrasion labyrinth-brush type composite sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811024501.8A CN108979740B (en) | 2018-09-04 | 2018-09-04 | Low-abrasion labyrinth-brush type composite sealing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108979740A CN108979740A (en) | 2018-12-11 |
| CN108979740B true CN108979740B (en) | 2023-07-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811024501.8A Active CN108979740B (en) | 2018-09-04 | 2018-09-04 | Low-abrasion labyrinth-brush type composite sealing device |
Country Status (1)
| Country | Link |
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| CN (1) | CN108979740B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112648019B (en) * | 2021-02-02 | 2024-06-07 | 昆明理工大学 | Flexible sealing device |
| CN116201898A (en) * | 2023-04-28 | 2023-06-02 | 势加透博(成都)科技有限公司 | Brush seal assembly |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0816726A1 (en) * | 1996-06-28 | 1998-01-07 | General Electric Company | Brush seals and combined labyrinth and brush seals for rotary machines |
| CN104454031A (en) * | 2014-10-24 | 2015-03-25 | 哈尔滨工业大学 | Combined seal structure with labyrinth seal structure and brush seal structure |
| CN105443161A (en) * | 2015-12-31 | 2016-03-30 | 沈阳航空航天大学 | Self-concentric brush seal structure with rotor provided with discs |
| WO2016124262A1 (en) * | 2015-02-04 | 2016-08-11 | Siemens Aktiengesellschaft | Brush seal arrangement |
| CN106246239A (en) * | 2016-07-29 | 2016-12-21 | 中国航空工业集团公司沈阳发动机设计研究所 | A kind of hybrid brush seals structure |
| CN206874313U (en) * | 2017-05-10 | 2018-01-12 | 昆明理工大学 | A kind of compound seal of labyrinth seal shoe guide brush seal |
-
2018
- 2018-09-04 CN CN201811024501.8A patent/CN108979740B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0816726A1 (en) * | 1996-06-28 | 1998-01-07 | General Electric Company | Brush seals and combined labyrinth and brush seals for rotary machines |
| CN104454031A (en) * | 2014-10-24 | 2015-03-25 | 哈尔滨工业大学 | Combined seal structure with labyrinth seal structure and brush seal structure |
| WO2016124262A1 (en) * | 2015-02-04 | 2016-08-11 | Siemens Aktiengesellschaft | Brush seal arrangement |
| CN105443161A (en) * | 2015-12-31 | 2016-03-30 | 沈阳航空航天大学 | Self-concentric brush seal structure with rotor provided with discs |
| CN106246239A (en) * | 2016-07-29 | 2016-12-21 | 中国航空工业集团公司沈阳发动机设计研究所 | A kind of hybrid brush seals structure |
| CN206874313U (en) * | 2017-05-10 | 2018-01-12 | 昆明理工大学 | A kind of compound seal of labyrinth seal shoe guide brush seal |
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| Publication number | Publication date |
|---|---|
| CN108979740A (en) | 2018-12-11 |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB03 | Change of inventor or designer information | ||
| CB03 | Change of inventor or designer information |
Inventor after: Wang Juan Inventor after: Liu Meihong Inventor after: Kang Yuchi Inventor after: Liu Jinbin Inventor after: Tan Yongfa Inventor before: Liu Meihong Inventor before: Liu Jinbin Inventor before: Wang Juan Inventor before: Tan Yongfa Inventor before: Kang Yuchi |
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| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20240409 Address after: 650000 Yanglin Industrial Development Zone, Songming County, Kunming City, Yunnan Province Patentee after: YUNNAN YUNNEI POWER MACHINERY MANUFACTURING Co.,Ltd. Country or region after: China Address before: 650093 No. 253, Xuefu Road, Wuhua District, Yunnan, Kunming Patentee before: Kunming University of Science and Technology Country or region before: China |