CN201779258U

CN201779258U - Fingertip seal device with integration design

Info

Publication number: CN201779258U
Application number: CN200920350104XU
Authority: CN
Inventors: 罗健; 周连杰; 胡海涛; 汪凯; 吴瑕; 徐鹏飞; 赵亚飞
Original assignee: China Gas Turbine Research Institute
Current assignee: China Gas Turbine Research Institute
Priority date: 2009-12-25
Filing date: 2009-12-25
Publication date: 2011-03-30
Anticipated expiration: 2019-12-25

Abstract

The utility model relates to a fingertip seal device with integration design, which includes a front baffle (1), a rear baffle (2), a fingertip piece assembly (3) and a mounting seat (4), wherein the mounting base (4) and the rear baffle (2) are designed into a whole, and all fingertip pieces of the fingertip piece assembly (3) are welded into a whole. The front baffle (1) is welded on the mounting base (4). The fingertip-seal device of the utility model integrates the rear baffle with the mounting seat, thereby solving the problem that the material thermal expansion coefficients of the seal device is not matched with those of a sealing bracket, and reducing the potential safety hazard that may exist in the application of an engine, reducing the number of spare parts simultaneously, and reducing the structure weight and dimensions. Owning to the integration design of the fingertip seal, the radial height for fingertip seal can be reduced by 6mm, and greater economical benefits can be generated.

Description

The finger tip seal arrangement of integrated design

Technical field

The utility model relates to a kind of finger tip seal arrangement.

Background technique

The means of fixation of finger tip seal arrangement has two kinds usually, and the one, to fix with collar, another kind is to fix with pressing plate.

See also Fig. 1, it is a kind of structural representation of prior art finger tip seal arrangement.This finger tip seal arrangement adopts collar to fix, and it comprises front screen 1, backboard 2, finger tip chip module 3, fitting seat 4, collar 5 and radial seal pad 6.Wherein, finger tip chip module 3 is arranged between front screen 1 and the backboard 2, and the three is connected by rivet and is fastened on the fitting seat 4 by collar 5, and finger tip chip module 3 contacts an end and is provided with radially gasket 6 with fitting seat 4.This finger tip seal arrangement is because structures such as front screen 1 and backboard 2 composition end face is difficult to compress, and the air of obturaging may leak from seal outer diameter, so need the radial seal pad be set in finger tip chip module 3 and fitting seat 4 connecting parts.Yet the seal groove on the finger tip seal outer diameter can only be processed on assembly, and iron filings and the impurity in the cooling liquid in the course of working are easy to enter the finger tip chip module.A lot of seams are arranged on the finger tip chip module, just be difficult to clean up in case enter impurity, therefore processing is inconvenient, and number of parts is many, the structure relative complex, and seal performance is not good enough.

See also Fig. 2, it is the structural representation of another kind of prior art finger tip seal arrangement.Described finger tip seal arrangement adopts pressing plate to fix, and it comprises front screen 1, backboard 2, finger tip chip module 3, fitting seat 4, pressing plate 7 and end face seal pad 8.Wherein, connect by rivet between described front screen 1, finger tip chip module 3 and the backboard 2, and be fixed on the fitting seat 4, and also be provided with end face seal pad 8 between backboard 2 and the fitting seat 4 by pressing plate 7.The pressing plate means of fixation is processed easily, has avoided the problem of assembly reprocessing, but will note the coupling of the material expansion coefficient between seal arrangement and the sealed support when design.If two kinds of material coefficient of thermal expansion difference of coefficients are too big, may cause that at high temperature fit up gap or tightness are excessive.Excesssive gap can make the centering of finger tip sealing bad, occurs eccentric wear during work, and the assembling tightness is excessive can to make forward and backward baffle plate distortion occur again, and extruding finger tip sheet causes to refer to that body follows the string, and then causes seal failure.

So prior art employing collar is fixing and the fixed structure number of parts of the finger tip seal arrangement of pressing plate is many, complex structure, weight is bigger, and size is bigger, has therefore increased the assembling difficulty, improved processing cost, special because the finger tip sheet is very thin, easy deformation or damage in assembly process, thus product performance are exerted an influence, therefore reliability is lower, has certain potential safety hazard.

The model utility content

The purpose of this utility model: prior art fingertip sealing structure number of parts is many in order to solve, complex structure, problem that weight is bigger, and the utility model provides that a kind of number of parts is few, compact structure, integrated design fingertip sealing structure that weight is lighter.

The technical solution of the utility model: a kind of finger tip seal arrangement, it comprises front screen, backboard, finger tip chip module and fitting seat, wherein, described fitting seat and backboard are designed to one, and each finger tip sheet of finger tip chip module is welded into an integral body.

Described front screen is welded on the fitting seat.

The beneficial effects of the utility model: the utility model finger tip seal arrangement is by being designed to one with backboard and fitting seat, avoided the unmatched problem of material thermal expansion coefficient between seal arrangement and sealed support, reduced the potential safety hazard that in engine application, may exist, reduced number of parts simultaneously, structure weight and size have been alleviated, wherein, integrated design by the finger tip sealing, the radial height of finger tip sealing can be reduced about 6mm, consider in the large aerospace motor, the diameter of obturaging of finger tip sealing may surpass 500mm, and therefore the weight that alleviates is appreciable, and can produce bigger economic benefit.In addition,, cancelled radial seal pad 6, avoided when the processing radial seal groove pollution that may cause the finger tip chip module because described finger tip chip module welds together.

Description of drawings

Fig. 1 is a kind of structural representation of prior art finger tip seal arrangement;

Fig. 2 is the structural representation of another kind of prior art finger tip seal arrangement;

Fig. 3 is the structural representation of the utility model finger tip seal arrangement one better embodiment;

Wherein, 1-front screen, 2-backboard, 3-finger tip chip module, 4-fitting seat, 5-collar, 6-radial seal pad, 7-pressing plate, 8-end face seal pad.

Embodiment

The utility model is described in further detail below by embodiment:

See also Fig. 3, it is the structural representation of the utility model finger tip seal arrangement one better embodiment.In the present embodiment, described finger tip seal arrangement comprises front screen 1, backboard 2, finger tip chip module 3.Wherein, the described fitting seat 4 of Fig. 1 and Fig. 2 is designed to one with backboard 2 in Fig. 1, cancelled the fixed structure of finger tip seal arrangement on fitting seat.To connect the rivet cancellation of finger tip sealing simultaneously, adopt welding procedure that each finger tip sheet of finger tip chip module 3 is welded into an integral body, with front screen 1 the finger tip chip module 3 that welds is pressed on the backboard 2 then, again front screen 1 is welded on the backboard 2, thereby form a black box.

The utility model finger tip seal arrangement is by being designed to one with backboard 2 and fitting seat 4, avoided the unmatched problem of material thermal expansion coefficient between seal arrangement and sealed support, reduced the potential safety hazard that in engine application, may exist, reduce number of parts simultaneously, alleviated structure weight.In addition,, cancelled radial seal pad 6, avoided when the processing radial seal groove pollution that may cause the finger tip chip module because described finger tip chip module welds together.

Therefore the utility model finger tip seal arrangement is cancelled the locating stud rivet by with backboard and fitting seat design one, and front screen is welded on the fitting seat, and the finger tip sheet welds together with laser beam welding, is clipped between the forward and backward baffle plate.This structure does not influence sealing device structure intensity, and does not influence sealability, but can effectively alleviate the weight and the size of finger tip seal arrangement, has reduced number of parts.Checking by experiment, integrated design by the finger tip sealing, the radial height of finger tip sealing can be reduced about 6mm, consider in the large aerospace motor, the diameter of obturaging of finger tip sealing may surpass 500mm, therefore the weight that alleviates by integrated design is appreciable, has bigger economic benefit.

Claims

1. finger tip seal arrangement, it comprises front screen (1), backboard (2), finger tip chip module (3) and fitting seat (4), it is characterized in that: described fitting seat (4) is designed to one with backboard (2), and each finger tip sheet of finger tip chip module (3) is welded into an integral body.

2. finger tip seal arrangement according to claim 1 is characterized in that: described front screen (1) is welded on the fitting seat (4).