CN209115158U - A kind of sealing structure improving brush filament sealing effect - Google Patents
A kind of sealing structure improving brush filament sealing effect Download PDFInfo
- Publication number
- CN209115158U CN209115158U CN201821842110.2U CN201821842110U CN209115158U CN 209115158 U CN209115158 U CN 209115158U CN 201821842110 U CN201821842110 U CN 201821842110U CN 209115158 U CN209115158 U CN 209115158U
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- China
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- brush
- brush filament
- wire bundle
- filament
- backboard
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Abstract
A kind of sealing structure improving brush filament sealing effect, belongs to turbomachinery technical field of sealing technology.Existing brush seal installation includes fusion welded zone, foreboard, brush wire bundle and backboard；Foreboard, brush wire bundle and backboard are connected by fusion welded zone, and brush wire bundle root is fixed on fusion welded zone, and end is bonded with rotor.In the case where existing brush seal installation overall structure is constant, brush filament diameter is successively increased from upstream front plate side to downstream backboard side, is successively increased from 0.05~0.08mm to 0.15~0.2mm；When wherein from upstream to downstream, one row brush silk of every increase is welded on fusion welded zone, brush filament diameter increases by 0.01~0.02mm.Heel row brush filament in this way is other than playing sealing function, additionally it is possible to play a supporting role to front-seat brush filament, can effectively avoid irregular deformations and the hair loss phenomenons that fracture such as the brush filament warpage not enough generated by rigidity, to solve the problems, such as brush filament rebound lag.
Description
Technical field
The utility model belongs to turbomachinery technical field of sealing technology, in particular to a kind of to improve the novel of brush filament sealing effect
Sealing structure can effectively solve brush filament abrasion and rebound lag issues, air leakage be reduced, to improve the work of turbomachinery
Efficiency and reliability.
Background technique
Brush seal is by high temperature alloy brush filament and backboard to be supported to manufacture by special fusion welding method, is mainly used for aviation hair
Motivation, gas turbine and turbine shaft seal.Brush seal is contact zero clearance seal, and sealing effect is good, the leakage of brush seal
Tolerance is the 10%~20% of labyrinth seal, makes the leakage loss sharp fall of turbomachinery, and improves the stabilization of rotor
Property.The main component brush filament of brush seal is a branch of high density banded together, in certain direction arrangement, circular section, straight
Diameter is the fine wire of 0.05~0.2mm.Brush filament free end is contacted with axis surface, other end vacuum electron beam or uses brass
It is brazed and links together with the annulus of brush wire bundle left and right ends.Brush filament free end is worked by exact scale using electric spark method
It is very little.Brush filament is regularly arranged by certain angle, to reduce the abrasion of brush filament, brush filament is made to be more easily adapted to conform to the thermal deformation of rotor, manufacture
The problems such as error, and after rotor moment substantially radial displacement, brush filament can rebound, and keep seal clearance constant.
Brush filament diameter is especially tiny, only 0.05~0.2mm, in high sealing pressure, high environment temperature and high superficial velocity
Under effect, since brush filament is rigidly inadequate, often there is brush filament and fracture hair loss phenomenon.In addition, in order to avoid supporting backboard and rotor
Collision, reduce abrasion to rotor, support usually there is 1.27mm or so between backboard and brush filament free end in brush seal installation
Protection height.Presence just because of this protection height supports brush filament free end without back veneer material, when air pressure is larger,
Brush filament bends along airflow direction, rebound lag, so that the gap between brush filament and rotor increases, so that air-flow be caused to let out
Leakage.
In order to further improve the sealing effect of brush seal mechanical device, machine work efficiency is improved, is highly desirable
Find a kind of technology simple, easy to operate, at low cost and that brush-type device flow leakage can be effectively reduced.
Summary of the invention
The purpose of this utility model is to provide it is a kind of improve brush filament sealing effect novel sealing structure, solve brush filament by
Not enough in rigidity, the hair loss phenomenon that fractures of appearance, while it is curved along airflow direction by free end when larger gas shock to solve brush filament
Flow leakage problem caused by rebound lag caused by bent.
The utility model is to be realized on the basis of existing brush seal installation by changing brush filament diameter: i.e. existing brush
Formula sealing device includes fusion welded zone, foreboard, brush wire bundle and backboard；Foreboard, brush wire bundle and backboard are connected by fusion welded zone, brush wire bundle
Root is fixed on fusion welded zone, and end is bonded with rotor.Brush filament used is the high temperature that uniform diameter is 0.05~0.2mm
Alloy wire, brush filament length be 20~45mm, brush filament angle be 30 °~60 °, brush wire bundle closeness be circumferencial direction 90~180/
Mm, overall thickness of the brush wire bundle on its axial direction are 0.5~2mm；Backboard height is 0.75~0.95 times of brush filament length, preceding
Plate height is 0.45~0.75 times of brush filament length, and foreboard and back plate thickness are 3~4.5mm.It is whole in existing brush seal installation
In the case that body structure is constant, brush filament diameter is successively increased from upstream front plate side to downstream backboard side, from 0.05~0.08mm
It successively increases to 0.15~0.2mm；When wherein from upstream to downstream, one row brush silk of every increase is welded on fusion welded zone, brush filament diameter increases
Add 0.01~0.02mm.Heel row brush filament in this way is other than playing sealing function, additionally it is possible to it plays a supporting role to front-seat brush filament, energy
Irregular deformations and the hair loss phenomenons that fracture such as the brush filament warpage not enough generated by rigidity are effectively avoided, to solve brush filament rebound
The problem of lag.
It is to be appreciated that belonging to the instruction such as " upstream ", " downstream ", " front row ", " heel row ", " lower end " in the utility model
Orientation or positional relationship be orientation based on the figure or relationship, be merely for convenience of description the utility model and simplification retouch
It states,
The initial diameter of the 4 middle and upper reaches brush filament of brush wire bundle is 0.05~0.08mm, and the termination diameter of downstream brush filament is
0.15~0.2mm.
When from upstream to downstream, one row brush silk of every increase is welded on the fusion welded zone 1, brush filament diameter increases in the brush wire bundle 4
Add 0.01~0.02mm.
In the brush wire bundle 4 brush filament length be 20~45mm, overall thickness of the brush wire bundle 4 on its axial direction be 0.5~
2mm。
The beneficial effects of the utility model are: not changing the basic structure of existing brush seal, by successively increasing brush filament
Diameter from upstream to downstream increases heel row brush filament to the supporting function of front-seat brush filament, hence it is evident that improve brush filament bearing capacity, effectively
Solve the problems, such as the irregular deformations such as brush filament warpage and the hair loss that fractures.Simultaneously in the situation for not reducing brush filament sealing structure flexibility
Under, effectively mitigate brush wire bundle and spring back hysteresis, so that brush wire bundle and rotor is maintained the gap of very little always, reduce leakage rate, have
Effect improves the operational efficiency of turbomachinery device.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model.Wherein, fusion welded zone 1, foreboard 2, backboard 3, brush wire bundle 4, rotor 5.
Specific embodiment
Existing brush seal installation includes fusion welded zone 1, foreboard 2, backboard 3 and brush wire bundle 4 and rotor 5；Foreboard, brush wire bundle
It is connected with backboard by fusion welded zone, brush wire bundle root is fixed on fusion welded zone, and end is bonded with rotor.
Brush filament used is nickel base superalloy silk, and common used material is both to have had high elevated temperature strength, good shaped
Performance, and the deformation of the Good All-around Properties such as welding performance, good oxidation and corrosion and rub resistance abrasion having had
High temperature alloy, the common trade mark have GH4145, GH605S, SG37A, Haynes214 etc..From upstream front plate side to downstream backboard side brush
Silk diameter successively increases, and successively increases from 0.08mm to 0.2mm；Wherein from upstream front plate side to one row of the every increase in downstream backboard side
For brush wire bundle through vacuum electron beam welding at fusion welded zone, brush filament diameter increases 0.01mm.Brush filament length is 20mm, and brush filament angle is
45 °, brush wire bundle closeness is 95/mm of circumferencial direction, and brush wire bundle axial direction overall thickness is 1.5mm；Backboard height is 15mm, foreboard
Height is 9mm, and foreboard and back plate thickness are 3mm, and foreboard and back veneer material are mainly 1Cr18Ni9Ti, GH625, GH4169 etc.
Stainless steel and wrought superalloy plate.Heel row brush filament in this way is other than playing sealing function, additionally it is possible to play to front-seat brush filament
Supporting role can effectively avoid irregular deformations and the hair loss phenomenons that fracture such as the brush filament warpage not enough generated by rigidity, thus
Solve the problems, such as brush filament rebound lag.
Compared with existing brush seal structure, by successively increasing diameter of the brush filament from upstream to downstream, row brush after increase
Silk is to the supporting function of front-seat brush filament, hence it is evident that improve brush filament bearing capacity, effectively solve the irregular deformations such as brush filament warpage and
The hair loss that fractures problem.Simultaneously in the case where not reducing brush seal structure situation flexible, effectively mitigates brush wire bundle and springs back hysteresis,
So that brush wire bundle and rotor is maintained the gap of very little always, reduces leakage rate, effectively improve the operational efficiency of turbomachinery device.
In the description of the present invention, it should be understood that belong to " upstream ", " downstream ", " front row ", " heel row ", " under
The orientation or positional relationship of the instructions such as end " is orientation based on the figure or relationship, and being merely for convenience of description, this is practical new
Type and simplified description, rather than the device or element of indication or suggestion meaning must have a particular orientation, with specific orientation
Construction and operation, therefore should not be understood as the limitation to scope of protection of the utility model.In addition, the utility model is not limited to
Preferred forms are stated, which is not the practical range for being used to limit the utility model patent.It is i.e. all special according to the application
The equivalent changes and modifications that the content of sharp range is done all should be the technology scope of the utility model.
Claims (2)
1. a kind of sealing structure for improving brush filament sealing effect, brush seal installation includes fusion welded zone, foreboard, brush wire bundle and back
Plate；Foreboard, brush wire bundle and backboard are connected by fusion welded zone, and brush wire bundle root is fixed on fusion welded zone, and end is bonded with rotor；Institute
It is the high temperature alloy silk that uniform diameter is 0.05~0.2mm with brush filament, brush filament length is 20~45mm, and brush filament angle is
30 °~60 °, brush wire bundle closeness is 90~180/mm of circumferencial direction, and overall thickness of the brush wire bundle on its axial direction is 0.5
~2mm；Backboard height is 0.75~0.95 times of brush filament length, and foreboard height is 0.45~0.75 times of brush filament length, foreboard
It is 3~4.5mm with back plate thickness；It is characterized by: successively increase brush filament diameter from upstream front plate side to downstream backboard side, from
0.05~0.08mm is successively increased to 0.15~0.2mm；Wherein, from upstream to downstream, one row brush silk of every increase is welded on fusion welded zone
When, brush filament diameter increases by 0.01~0.02mm.
2. sealing structure according to claim 1, which is characterized in that the starting of brush wire bundle (4) the middle and upper reaches brush filament is straight
Diameter is 0.05~0.08mm, and the termination diameter of downstream brush filament is 0.15~0.2mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821842110.2U CN209115158U (en) | 2018-11-08 | 2018-11-08 | A kind of sealing structure improving brush filament sealing effect |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821842110.2U CN209115158U (en) | 2018-11-08 | 2018-11-08 | A kind of sealing structure improving brush filament sealing effect |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209115158U true CN209115158U (en) | 2019-07-16 |
Family
ID=67204403
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821842110.2U Active CN209115158U (en) | 2018-11-08 | 2018-11-08 | A kind of sealing structure improving brush filament sealing effect |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209115158U (en) |
-
2018
- 2018-11-08 CN CN201821842110.2U patent/CN209115158U/en active Active
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