CN111287804B - Multistage brush seal with different levels of differential structures - Google Patents
Multistage brush seal with different levels of differential structures Download PDFInfo
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- CN111287804B CN111287804B CN202010099109.0A CN202010099109A CN111287804B CN 111287804 B CN111287804 B CN 111287804B CN 202010099109 A CN202010099109 A CN 202010099109A CN 111287804 B CN111287804 B CN 111287804B
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- brush
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- type sealing
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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
Abstract
The invention discloses a multistage brush seal with different levels of differentiated structures, which comprises: brush seal installation seat, multistage brush seal unit and baffle, brush seal unit at different levels all includes the brush silk bundle, preceding baffle and backplate, along the direction of upper reaches level to the brush seal unit of downstream level, the free end of brush silk bundle and the radial clearance on rotor surface at different levels increase step by step and be the interference between the free end of first order brush silk bundle and the rotor surface, the diameter of brush silk at different levels, the circumference inclination of brush silk bundle increases step by step, the density of brush silk bundle at different levels, thickness reduces step by step, the axial distance between backplate and this level brush silk bundle at different levels increases step by step, the height of backplate at different levels increases step by step, the radial clearance of baffle and rotor surface before each level increases step by step. The multistage brush seal can solve the problem of unbalanced pressure drop at all levels in the traditional multistage brush seal, avoid the problem that a certain stage of brush wires are too large in pressure drop and fail in advance, and ensure the service life of the multistage brush seal.
Description
Technical Field
The invention relates to the field of rotary sealing of turbomachinery, and particularly provides a multistage brush type seal with different levels of differentiated structures.
Background
The brush seal is a contact dynamic seal with excellent performance and has strong adaptability to instantaneous eccentric whirling of the rotor. At present, brush seals have been widely used in aircraft engines, gas turbines, and steam turbines as an alternative to labyrinth seals. The single-stage brush seal has limited bearing capacity, so that a multi-stage brush seal is usually used under a large pressure difference condition, however, geometric parameters of all stages of the existing multi-stage brush seal structure are the same, and in the working process of the multi-stage brush seal structure, due to the fact that the volume flow of air flow flowing through the brush seals of all stages is increased step by step, the pressure drop of a downstream stage is always large, and further the multi-stage brush seal is caused to fail in advance. In addition, the imbalance of pressure drop at each stage of the multi-stage brush seal can cause the imbalance of loads such as airflow force, frictional wear, frictional heat effect and the like of each stage of brush wire, and further, the faults such as plastic deformation, frictional wear, high-temperature adhesion fusing, fatigue fracture and the like of a certain stage of brush wire bundle can be caused, and the sealing characteristic and the service life of the multi-stage brush seal are directly influenced.
Therefore, a multistage brush type seal is developed to adjust the balance relation between pressure drops of all stages, so that the multistage brush type seal still ensures the due sealing effect and service life under a high pressure-bearing state, improves the sealing performance, and becomes the problem which is urgently needed to be solved for developing the advanced sealing technology of the high-parameter turbine machinery and ensuring the safe operation of a unit at present.
Disclosure of Invention
In view of this, the present invention provides a multi-stage brush seal with differentiated structures at different stages, so as to solve the problem that the conventional multi-stage brush seal is prone to premature failure of the seal due to too large pressure drop at the downstream stage caused by the same geometric parameters at the different stages.
The technical scheme provided by the invention is as follows: a multi-stage brush seal of stage-differential construction comprising: the brush type sealing device comprises a brush type sealing mounting seat, a plurality of stages of brush type sealing units and a partition plate correspondingly arranged between the adjacent brush type sealing units, wherein each stage of brush type sealing unit comprises a brush wire bundle, a front baffle and a rear baffle, the radial clearance between the free end of the brush wire bundle of each level of brush sealing unit and the surface of the rotor is gradually increased along the direction from the upstream level to the downstream level of brush sealing unit, the interference is formed between the free end of the brush wire bundle of the first level of brush sealing unit and the surface of the rotor, the diameters of the brush wires of each level of brush wire bundle are gradually increased, the circumferential inclination angle of each level of brush wire bundle is gradually increased, the density of each level of brush wire bundle is gradually reduced, the thickness of each level of brush wire bundle is gradually reduced, the axial distance between the rear baffle of each level of brush sealing unit and the brush wire bundle of the level of brush sealing unit is gradually increased, the height of the rear baffle of each level of brush sealing unit is gradually increased, and the radial clearance between the front baffle of each level of brush sealing unit and the surface of the rotor is gradually increased.
Preferably, each level of brush type sealing unit and the partition plate are of a combined installation structure.
Preferably, the variation range of the radial clearance between the free end of the brush wire bundle of each stage of brush sealing unit and the rotor is-0.2-0.5 mm.
More preferably, the diameter of the brush filament bundle of each stage of brush seal unit is varied within the range of 0.08-0.2 mm.
More preferably, the circumferential inclination angle of the brush wire bundle of each stage of the brush seal unit is varied within a range of 30 ° to 70 °.
Preferably, the variation range of the distance between the brush wires of the brush wire bundle of each stage of brush sealing unit is 0.008-0.02 mm.
More preferably, the thickness of the brush filament bundle of each stage of brush seal unit is varied within a range of 2.5 to 1.0 mm.
More preferably, the height of the rear baffle of each stage of brush seal unit is 1.1-3.2 mm.
More preferably, the axial distance between the rear baffle of each stage of brush seal unit and the brush wire bundle of the stage of brush seal unit varies within a range of 0.5 to 0.9 mm.
More preferably, the variation range of the radial clearance between the front baffle plate of each stage of brush type sealing unit and the surface of the rotor is 1.4-2.0 mm.
The multistage brush seal with different levels of differentiated structures provided by the invention has a simple structure, adopts a modular design on the basis of not changing the basic structure composition of the traditional brush seal, and has clear installation steps and easy control; compared with the traditional brush sealing structure, the multistage brush seal with the different-level structure provided by the invention has the advantages that the radial clearance between the free end of each level of brush filament bundle and the surface of the rotor, the circumferential inclination angle of each level of brush filament bundle, the diameter of each level of brush filament, the density of each level of brush filament bundle, the thickness of each level of brush filament bundle, the axial distance between each level of rear baffle and brush filament bundle, the height of each level of rear baffle, and the radial clearance between each level of front baffle and the surface of the rotor are changed, so that the flow passage sectional area of the downstream brush sealing unit is changed, the pressure drop of each level of the multistage brush sealing unit is balanced, the service life of the multistage brush seal is prolonged, and the overall performance of the aircraft engine is improved; the multistage brush seal with the differentiated structures at all levels provided by the invention adopts a mode of assembling and fixing individual parts, and only individual replacement is needed without integral scrapping and replacement when the individual parts fail, so that the influence on the service performance and the service life of the whole brush seal due to local damage is reduced; all parts are batch parts which can be repeatedly produced in large quantity, so that the manufacturing cost is greatly simplified, the disassembly, the replacement and the maintenance are convenient, and the use and maintenance cost is reduced.
Drawings
The invention is described in further detail below with reference to the following figures and embodiments:
FIG. 1 is a schematic view of an assembly of a multi-stage brush seal with differentiated structure of each stage according to the present invention;
fig. 2 is a schematic structural view of a brush seal unit in a multi-stage brush seal having a differential structure in each stage according to the present invention.
Detailed Description
The invention will be further explained with reference to specific embodiments, without limiting the invention.
As shown in fig. 1 and 2, the present invention provides a multi-stage brush seal with differentiated structure of each stage, comprising: the brush seal mounting seat 1, the multiple stages of brush seal units 2 and the partition plates 3 correspondingly arranged between the adjacent brush seal units 2, each stage of brush seal unit 2 comprises a brush wire bundle 21, a front baffle 22 and a rear baffle 23, and the partition plates are used for ensuring the axial distance between the brush seal units of each stage, wherein along the direction from an upstream stage to a downstream stage of brush seal unit, the radial clearance between the free end of the brush wire bundle 21 of each stage of brush seal unit 2 and the surface of the rotor 4 is gradually increased, the free end of the brush wire bundle of the first stage of brush seal unit 2 is in interference with the surface of the rotor 4, the diameter of the brush wire bundle 21 of each stage is gradually increased, the circumferential inclination angle of the brush wire bundle 21 of each stage is gradually increased, the density of the brush wire bundle 21 of each stage is gradually reduced, the thickness of the brush wire bundle 21 of each stage is reduced, the axial distance between the rear baffle 23 of each stage of brush seal unit 2 and the brush wire bundle 21 of the brush seal unit 2 of each stage is gradually increased, the height of the rear baffle 23 of each stage of brush seal unit 2 is increased step by step, and the radial clearance between the front baffle 22 of each stage of brush seal unit 2 and the surface of the rotor is increased step by step.
The installation method of the multistage brush seal with each stage of differentiated structure comprises the following steps: the method comprises the steps of axially arranging and combining all levels of brush type sealing units and partition plates which are processed in a large scale according to the required requirements, firstly assembling the first level of brush type sealing units to a brush type sealing installation seat, then sequentially assembling the partition plates and other all levels of brush type sealing units to the brush type sealing installation seat according to the arranged and combined sequence, and finally locking the brush type sealing installation seat to achieve the purpose of clamping all levels of brush type sealing units and finally forming the multi-level brush type seal.
The working principle of the multistage brush type seal with each stage of differentiated structure is as follows: during operation, due to the differentiated structure of each stage, the sectional area of the flow channel of the brush seal unit of the downstream stage is increased, the increasing trend of volume flow flowing through each stage caused by pressure reduction is relieved, the purpose of changing pressure drop distribution of each stage is further achieved, and the purpose of effectively prolonging the whole service life of the multi-stage brush seal is achieved.
As the improvement of the technical scheme, the brush seal unit structures and the partition plates at all levels are combined mounting structures.
As the improvement of the technical scheme, the variation range of the radial clearance between the free end of the brush wire bundle of each level of brush sealing unit and the rotor is-0.2-0.5 mm.
As the improvement of the technical scheme, the diameter variation range of the brush filament bundle of each level of brush type sealing unit is 0.08-0.2 mm.
As the improvement of the technical scheme, the variation range of the circumferential inclination angle of the brush wire bundle of each level of brush type sealing unit is 30-70 degrees.
As the improvement of the technical scheme, the variation range of the distance between the brush wires of the brush wire bundle of each level of brush sealing unit is 0.008-0.02 mm.
As the improvement of the technical scheme, the thickness variation range of the brush filament bundle of each level of brush type sealing unit is 2.5-1.0 mm.
As the improvement of the technical scheme, the height variation range of the rear baffle of each level of brush type sealing unit is 1.1-3.2 mm.
As an improvement of the technical scheme, the axial distance between the rear baffle of each stage of brush sealing unit and the brush wire bundle of the stage of brush sealing unit is changed within the range of 0.5-0.9 mm.
As the improvement of the technical scheme, the variation range of the radial clearance between the front baffle of each level of brush type sealing unit and the surface of the rotor is 1.4-2.0 mm.
The embodiments of the present invention have been written in a progressive manner with emphasis placed on the differences between the various embodiments, and similar elements may be found in relation to each other.
The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (9)
1. A multi-stage brush seal of differential structure at each stage, comprising: the brush type sealing device comprises a brush type sealing mounting seat, a multi-stage brush type sealing unit and a partition plate correspondingly arranged between the adjacent brush type sealing units, wherein each stage of brush type sealing unit comprises a brush wire bundle, a front baffle plate and a rear baffle plate, the radial clearance between the free end of the brush wire bundle of each stage of brush type sealing unit and the surface of a rotor is gradually increased along the direction from an upstream stage to a downstream stage of the brush type sealing unit, the free end of the brush wire bundle of a first stage of brush type sealing unit is in interference with the surface of the rotor, the diameter of the brush wire bundle of each stage of brush wire bundle is gradually increased, the circumferential inclination angle of each stage of brush wire bundle is gradually increased, the density of each stage of brush wire bundle is gradually reduced, the thickness of each stage of brush wire bundle is gradually reduced, the axial distance between the rear baffle plate of each stage of brush type sealing unit and the brush wire bundle of the stage of brush type sealing unit is gradually increased, the height of the rear baffle plate of each stage of the brush type sealing unit is gradually increased, the radial clearance between the front baffle plate of the brush type sealing unit and the surface of the rotor is gradually increased, the brush type sealing units and the partition plates at all levels are of a combined installation structure.
2. The multi-stage brush seal of differential structure of stages according to claim 1, characterized in that: the variation range of the radial clearance between the free end of the brush wire bundle of each level of brush sealing unit and the rotor is-0.2-0.5 mm.
3. The multi-stage brush seal of differential structure of stages according to claim 1, characterized in that: the diameter variation range of the brush filament bundles of each level of brush type sealing unit is 0.08-0.2 mm.
4. The multi-stage brush seal of differential structure of stages according to claim 1, characterized in that: the variation range of the circumferential inclination angle of the brush tows of each level of brush type sealing unit is 30-70 degrees.
5. The multi-stage brush seal of differential structure of stages according to claim 1, characterized in that: the variation range of the distance between the brush wires of the brush wire bundle of each level of brush sealing unit is 0.008-0.02 mm.
6. The multi-stage brush seal of differential structure of stages according to claim 1, characterized in that: the thickness variation range of the brush filament bundles of each level of brush sealing unit is 2.5-1.0 mm.
7. The multi-stage brush seal of differential structure of stages according to claim 1, characterized in that: the height variation range of the rear baffle of each level of brush type sealing unit is 1.1-3.2 mm.
8. The multi-stage brush seal of differential structure of stages according to claim 1, characterized in that: the axial distance between the rear baffle of each level of brush sealing unit and the brush wire bundle of the level of brush sealing unit is 0.5-0.9 mm.
9. The multi-stage brush seal of differential structure of the stages according to any of claims 1 to 8, characterized in that: the variation range of the radial clearance between the front baffle of each level of brush type sealing unit and the surface of the rotor is 1.4-2.0 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010099109.0A CN111287804B (en) | 2020-02-18 | 2020-02-18 | Multistage brush seal with different levels of differential structures |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010099109.0A CN111287804B (en) | 2020-02-18 | 2020-02-18 | Multistage brush seal with different levels of differential structures |
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| Publication Number | Publication Date |
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| CN111287804A CN111287804A (en) | 2020-06-16 |
| CN111287804B true CN111287804B (en) | 2022-04-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010099109.0A Active CN111287804B (en) | 2020-02-18 | 2020-02-18 | Multistage brush seal with different levels of differential structures |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5106104A (en) * | 1990-10-11 | 1992-04-21 | General Electric Company | Constant pressure drop multiple stage brush seal |
| US5799952A (en) * | 1995-12-09 | 1998-09-01 | Rolls-Royce Plc | Brush seal |
| CN101375089A (en) * | 2006-01-26 | 2009-02-25 | 西门子公司 | Multi-stage brush seal |
| CN105443164A (en) * | 2015-12-31 | 2016-03-30 | 沈阳航空航天大学 | Brush type sealing structure with step type ring-shaped lug bosses on rear baffle plate |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100164177A1 (en) * | 2008-12-30 | 2010-07-01 | Eaton Corporation | Hybrid multistage brush seal |
-
2020
- 2020-02-18 CN CN202010099109.0A patent/CN111287804B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5106104A (en) * | 1990-10-11 | 1992-04-21 | General Electric Company | Constant pressure drop multiple stage brush seal |
| US5799952A (en) * | 1995-12-09 | 1998-09-01 | Rolls-Royce Plc | Brush seal |
| CN101375089A (en) * | 2006-01-26 | 2009-02-25 | 西门子公司 | Multi-stage brush seal |
| CN105443164A (en) * | 2015-12-31 | 2016-03-30 | 沈阳航空航天大学 | Brush type sealing structure with step type ring-shaped lug bosses on rear baffle plate |
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| CN111287804A (en) | 2020-06-16 |
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