CN114673564A - Fingertip sealing device - Google Patents
Fingertip sealing device Download PDFInfo
- Publication number
- CN114673564A CN114673564A CN202210260478.2A CN202210260478A CN114673564A CN 114673564 A CN114673564 A CN 114673564A CN 202210260478 A CN202210260478 A CN 202210260478A CN 114673564 A CN114673564 A CN 114673564A
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- CN
- China
- Prior art keywords
- fingertip
- elastic element
- sealing
- sealing device
- rear baffle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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- 238000007789 sealing Methods 0.000 title claims abstract description 79
- 238000003466 welding Methods 0.000 claims description 6
- 229920001967 Metal rubber Polymers 0.000 claims description 3
- 238000009434 installation Methods 0.000 abstract 1
- 238000010276 construction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- 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
- F01D11/001—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between stator blade and rotor
-
- 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
- F01D11/08—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator
-
- 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
- F01D11/08—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator
- F01D11/14—Adjusting or regulating tip-clearance, i.e. distance between rotor-blade tips and stator casing
- F01D11/16—Adjusting or regulating tip-clearance, i.e. distance between rotor-blade tips and stator casing by self-adjusting means
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Sealing Devices (AREA)
Abstract
The application provides a fingertip sealing device which comprises a clamping ring, a front baffle, a fingertip sheet, a first elastic element, a second elastic element and a rear baffle, wherein the front baffle, the rear baffle and the fingertip sheet form a fingertip sealing unit, and a radial gap is formed between the rear baffle of the fingertip sealing unit and an installation seat; wherein, a plurality of parallel wire grooves are processed on the annular fingertip sheets along the direction forming a preset angle with the circumference, the wire grooves enable the body of the fingertip beam to form the fingertip beam which is only connected with the body part and the part of which is separated from the body, and a fingertip shoe is formed at the free end of the fingertip beam; the first elastic element is arranged at a radial position between the mounting edge of the rear baffle and the mounting seat so as to provide elastic force for the fingertip sealing unit to restore to the position along the sealing runway after moving radially; the second elastic element and the clamping ring are respectively arranged on the front side and the rear side of the axial position of the fingertip sealing unit, so that the fingertip sealing unit is axially fixed and limited on the mounting seat.
Description
Technical Field
The application belongs to the technical field of aeroengine sealing, and particularly relates to a fingertip sealing device.
Background
The sealing device is one of important parts in an aircraft engine and a gas turbine, and the sealing device applied to an air flow path can directly influence the air entraining quantity of an air system, and further influence the thrust and the heat efficiency of the engine.
A typical sealing device applied to an air flow path is a fingertip seal, which has a similar sealing effect to a brush seal, but has an advantage of low processing cost.
For contact type fingertip sealing, sliding friction exists between the fingertip pieces and the sealing track, and the magnitude of the friction force directly influences the heat productivity and the abrasion loss of the fingertip sealing device, so that the service life and the sealing performance of the sealing device are influenced. The sliding friction force is determined by the positive contact pressure between the fingertip seal and the runway, and for an aircraft engine and a gas turbine, the radial deformation of a rotor (a sealing runway) is certain, so the sliding friction force is mainly determined by the radial contact rigidity of the fingertip sheets. Therefore, reducing the radial contact stiffness of the fingertip pieces is key to improving the service life and the sealing performance of the fingertip sealing device.
The radial contact rigidity of the finger tip piece is nonlinearly changed along with the radial deformation of the sealing track. When the radial deformation of the sealing track is small, the radial contact rigidity of the fingertip pieces depends on the rigidity of the fingerboards and the friction force between the fingertip pieces and the rear baffle plate of the cantilever beam structure; when the radial deformation amount of the sealing track is larger than the radial movable range of the fingertip sheet, the radial contact rigidity of the fingertip sheet mainly depends on the elastic modulus of the material, and the rigidity is obviously increased.
For the problem of reducing the radial rigidity of the fingertip sheet, the following solutions are available in the prior art:
1) for example, in the pressure balance type fingertip seal of patent No. US6196550B1, an annular cavity is designed at the position of a fingertip seal rear baffle and is connected with a high-pressure cavity, so that the pressure in the cavity is close to the high-pressure cavity, the friction force between a finger tip sheet and the rear baffle is reduced, and the radial contact rigidity of the finger tip sheet is further reduced; the scheme has the effect when the radial deformation of the sealing track is smaller, but when the radial deformation of the sealing track is larger than the radial movable range of the fingertip sheet, the radial contact rigidity of the fingertip sheet cannot be obviously increased;
2) for example, in the patent No. CN201110455336.3, "a fingertip sealing device", a gap is designed between an anti-rotation pin between a finger tip piece and a mounting seat and an anti-rotation hole of the finger tip piece or the mounting seat, so as to ensure that the finger tip piece can float in a small range along a radial direction; the scheme can improve the radial movable range of the fingertip sheet, but when the radial deformation of the sealing track is large, the fingertip sheet floats along the sealing track, the fingertip sheet cannot automatically reset, and the sealing performance is poor;
3) for example, in a 'fingertip sealing device' with a patent number of cn201110455340.x, the linear design of the fingertip sheet is a concave curve, so that the contact pressure of a unit area is reduced, and the service life is prolonged; however, the scheme is similar to the technical scheme of 'pressure balance type fingertip sealing', and when the radial deformation of the sealing track is larger than the radial movable range of the fingertip sheet, the radial contact rigidity of the fingertip sheet cannot be obviously increased.
Disclosure of Invention
It is an object of the present application to provide a fingertip sealing device to solve or mitigate at least one of the problems of the background art.
The technical scheme of the application is as follows: a fingertip sealing device is arranged between a stator structure of a mounting seat and a rotor structure of a sealing runway, and is characterized by comprising a clamping ring, a front baffle plate, a fingertip sheet, a first elastic element, a second elastic element and a rear baffle plate,
the front baffle is in a circular ring shape, the rear baffle is in a circular ring structure with a mounting edge, a plurality of or multiple layers of fingertip pieces are arranged on the mounting edge of the rear baffle in an overlapping mode, a fingertip sealing unit is formed by pressing the front baffle on the fingertip pieces and fixedly connecting the fingertip pieces with the mounting edge of the rear baffle, and a radial gap is formed between the rear baffle of the fingertip sealing unit and the mounting seat; the finger tip beam is characterized in that a plurality of parallel wire grooves are processed on a circular fingertip sheet along the direction forming a preset angle with the circumference, the wire grooves enable a fingertip beam which is only connected with the body part and is partially separated from the body to be formed on the body of the fingertip beam, and a fingertip shoe is formed at the free end of the fingertip beam;
the first elastic element is arranged at a radial position between the mounting edge of the back baffle and the mounting seat so as to provide elastic force for the fingertip sealing unit to return to the position along the sealing runway after moving in the radial direction;
The second elastic element and the clamping ring are respectively arranged on the front side and the rear side of the axial position of the fingertip sealing unit, so that the fingertip sealing unit is axially fixed and limited on the mounting seat, and the second elastic element is used for ensuring that the rear baffle plate is not separated from the clamping ring under a small sealing pressure difference state.
Furthermore, the front baffle is fixed on the mounting edge of the rear baffle in a welding mode.
Furthermore, the finger tip sheets in multiple layers are connected with the front baffle and the rear baffle in a welding, riveting or bolt mode.
Furthermore, a movable gap is formed between the radial inner side of the front baffle and the fingertip sheet.
Further, the range of the radial gap is 0.5 mm-2 mm.
Furthermore, the wire groove and the finger tip piece are arranged in a direction of a preset angle with the circumference according to requirements.
Furthermore, the number of the first elastic elements is a plurality of and is circumferentially and evenly distributed.
Further, the number of the first elastic elements is not less than 8.
Furthermore, the first elastic element is a cylindrical spring or metal rubber.
Further, the second elastic element is a wave spring or a cylindrical spring.
The application provides a fingertip sealing device is through increasing elastic element or elastic construction in the radial outside of fingertip sealing unit, and the radial clearance between reasonable control fingertip sealing unit and the mount pad, avoids because the radial deflection of seal runway is greater than the apparent increase of fingertip piece radial contact rigidity that indicates the radial movable range of point piece and lead to, guarantees when indicating the point piece along with the radial runout removal back of seal runway, can automatic re-setting, avoids leaking the increase of leakage quantity.
Drawings
In order to more clearly illustrate the technical solutions provided in the present application, the drawings will be briefly described below. It is to be understood that the drawings described below are merely exemplary of some embodiments of the application.
Fig. 1 is a schematic view of a fingertip seal of the present application.
Fig. 2 is a partially enlarged view of a fingertip sheet of the present application.
Reference numerals:
1-mounting base
2-clamping ring
3-front baffle
31-clearance of movement
4-finger tip piece
41-finger tip beam
42-finger tip boots
43-positioning hole
44-wire groove
5-first elastic element
6-second elastic element
7-rear baffle
71-mounting edge
8-sealing runway
Detailed Description
In order to make the implementation objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the drawings in the embodiments of the present application.
As shown in fig. 1, which is a schematic cross-sectional view of the fingertip sealing device provided by the present application, the mounting seat 1 is of a stator structure, the sealing track 8 is of a rotor structure, and the fingertip sealing device is disposed between the stator structure and the rotor structure. The fingertip sealing device mainly comprises a front baffle plate 3, a fingertip sheet 4, a first elastic element 5, a second elastic element 6 and a rear baffle plate 7. The front baffle 3, the fingertip pieces 4 and the rear baffle 7 form a typical fingertip sealing unit, namely the front baffle 3 is in a circular ring shape, the rear baffle 7 is in a circular ring structure with a mounting edge 71, a plurality of or multiple layers of fingertip pieces 4 are overlapped on the mounting edge 71 of the rear baffle 7, and the front baffle 3 is pressed on the fingertip pieces 4 and fixed with the mounting edge 71 of the rear baffle 7 to form the fingertip sealing unit. The front baffle plate 3 can be fixed on the mounting edge 71 of the back baffle plate 7 by welding, and the plurality of or multiple layers of fingertip sheets 4 can be connected with the front baffle plate 3 and the back baffle plate 7 by welding or can be connected by riveting or bolts. Preferably, the front baffle 1 is provided with a movable gap 31 between the radial inner side (the side close to the seal running to 8) and the multi-layer finger tip piece 4.
As shown in fig. 2, which is a partially enlarged view of the fingertip sheet 4, the fingertip sheet 4 is a thin circular band, a certain area of material is removed from the fingertip sheet 4 of the circular band by machining, so that a series of elongated curved fingertip beams 41 are formed, and a fingertip shoe 42 is formed at a free end of each fingertip beam 41. The forming method comprises the following steps: a plurality of parallel line grooves 44 are formed in the annular fingertip pieces 4 substantially along a direction forming an angle with the circumferential direction, and the line grooves 44 form the fingertip beams 41 in a state that the body of the fingertip beam 41 is connected with only the upper part of the body and the rest part is separated from the body. In some embodiments, the angle between the line groove 44 and the circumferential direction of the fingertip sheet 4 may be set as desired. A plurality of or a plurality of layers of the fingertip pieces 4 are alternately stacked so that the fingertip beams 41 of one fingertip piece 4 cover the line grooves 44 between the fingertip beams 41 of the adjacent fingertip pieces 4, and the plurality of or a plurality of layers of the fingertip pieces 4 are positioned by providing positioning holes 43 at the upper ends of the fingertip pieces 4 (i.e., the portions where the fingertip beams 41 are connected to the fingertip piece body).
A radial gap with a certain range is arranged between a rear baffle 7 and the mounting seat 1 in the fingertip sealing unit, so that the fingertip sealing unit can move radially. In some embodiments, the radial gap is set to 0.5mm to 2 mm.
The first elastic elements 5 are arranged at radial positions between the mounting edge 71 of the back baffle plate 7 and the mounting seat 1, and the number of the first elastic elements is multiple and is distributed uniformly in the circumferential direction. Typically, the number of first elastic elements 5 is greater than 8. Wherein, first elastic element 5 sets up in the recess of mount pad 1 relevant position processing to guarantee that the sealed unit of fingertip can follow sealed runway 8 and resume rapidly after producing radial movement, avoid appearing the clearance between fingertip piece 4 and sealed runway 8, increase leakage quantity. In some embodiments, the first elastic element 5 may be a cylindrical spring, or a metal rubber. Correspondingly, the groove processed on the mounting seat 1 is a circular groove.
The clamping ring 2 and the second elastic element 6 are arranged on the front side and the rear side of the fingertip sealing unit in the axial direction, so that the fingertip sealing unit is axially fixed and limited on the mounting seat 1, and the second elastic element 6 is used for ensuring that the rear baffle 7 is not separated from the clamping ring 2 in a small sealing pressure difference state. In some embodiments, the second elastic element 6 may be a wave spring, and may also be a cylindrical spring.
The application provides a fingertip sealing device is through increasing elastic element or elastic construction in the radial outside of fingertip sealing unit, and the radial clearance between reasonable control fingertip sealing unit and the mount pad, avoids because the radial deflection of seal runway is greater than the apparent increase of fingertip piece radial contact rigidity that indicates the radial movable range of point piece and lead to, guarantees when indicating the point piece along with the radial runout removal back of seal runway, can automatic re-setting, avoids leaking the increase of leakage quantity.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A fingertip sealing device is arranged between a stator structure of a mounting seat (1) and a rotor structure of a sealing track (8), and is characterized by comprising a clamping ring (2), a front baffle plate (3), a fingertip sheet (4), a first elastic element (5), a second elastic element (6) and a rear baffle plate (7),
the front baffle (3) is in a circular ring shape, the rear baffle (7) is in a circular ring structure with a mounting edge (71), a plurality of or multiple layers of finger tip sheets (4) are overlapped on the mounting edge (71) of the rear baffle (7), the finger tip sheets (4) are pressed through the front baffle (3) and are fixedly connected with the mounting edge (71) of the rear baffle (7) to form a fingertip sealing unit, and a radial gap is reserved between the rear baffle (7) of the fingertip sealing unit and the mounting seat (1); wherein, a plurality of parallel wire grooves (44) are processed on the annular fingertip sheet (4) along the direction forming a predetermined angle with the circumference, the wire grooves (44) enable the body of the fingertip beam (41) to form the fingertip beam (41) which is only connected with the body part and partially separated from the body, and a fingertip boot (42) is formed at the free end of the fingertip beam (41);
The first elastic element (5) is arranged at a radial position between a mounting edge (71) of the back baffle (7) and the mounting seat (1) so as to provide elastic force for the fingertip sealing unit to return to a position following the sealing track (8) after moving radially;
the second elastic element (6) and the clamping ring (2) are respectively arranged on the front side and the rear side of the axial position of the fingertip sealing unit, so that the fingertip sealing unit is axially fixed and limited on the mounting seat (1), and the second elastic element (6) is used for ensuring that the rear baffle (7) is not separated from the clamping ring (2) under a small sealing pressure difference state.
2. Fingertip sealing device according to claim 1, characterized in that the front flap (3) is fixed to the mounting edge (71) of the back flap (7) by welding.
3. Fingertip sealing device according to claim 1, characterized in that a plurality or layers of the fingertip pieces (4) are connected with the front flap (3) and the back flap (7) by welding, riveting or bolting.
4. Fingertip sealing device according to claim 1, characterized in that the front flap (1) is provided with a play gap (31) between the radially inner side and the fingertip sheet (4).
5. A fingertip seal according to claim 1, wherein the radial gap is in the range of 0.5mm to 2 mm.
6. Fingertip sealing device according to claim 1, characterized in that the thread groove (44) and the fingertip sheet (4) are arranged in a direction at a predetermined angle to the circumference as desired.
7. Fingertip sealing device according to claim 1, characterized in that the number of the first elastic elements (5) is a plurality and is circumferentially uniform.
8. Fingertip sealing device according to claim 7, characterized in that the number of the first elastic elements (5) is not less than 8.
9. Fingertip seal device according to claim 7 or 8, characterized in that the first elastic element (5) is a cylindrical spring or a metal rubber.
10. Fingertip sealing device according to claim 1, characterized in that the second elastic element (6) is a wave spring or a cylindrical spring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210260478.2A CN114673564B (en) | 2022-03-16 | 2022-03-16 | Fingertip sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210260478.2A CN114673564B (en) | 2022-03-16 | 2022-03-16 | Fingertip sealing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114673564A true CN114673564A (en) | 2022-06-28 |
| CN114673564B CN114673564B (en) | 2023-11-28 |
Family
ID=82074329
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210260478.2A Active CN114673564B (en) | 2022-03-16 | 2022-03-16 | Fingertip sealing device |
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| CN (1) | CN114673564B (en) |
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| CN114673564B (en) | 2023-11-28 |
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