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Involute-type fingertip sealing structure

A fingertip sealing, linear technology, applied in the direction of engine sealing, leakage prevention, engine components, etc., can solve the problems of poor sealing performance, complex processing, and high production costs, and achieve improved sealing performance and simple processing technology. , the effect of low cost

Inactive Publication Date: 2010-06-23
CHINA GAS TURBINE ESTAB
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Purpose of the present invention: In order to solve the problems of poor sealing performance, complicated processing and high production cost of the prior art fingertip seal structure, the present invention provides a progressive seal with good sealing performance, convenient processing and low production cost. Open-line fingertip seal structure

Method used

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  • Involute-type fingertip sealing structure
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  • Involute-type fingertip sealing structure

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Embodiment Construction

[0021] The present invention will be described in further detail below by means of specific embodiments:

[0022] see figure 1 , which is a structural schematic diagram of a preferred embodiment of the involute fingertip sealing device of the present invention. The involute fingertip sealing device is composed of a front baffle 1, a rear baffle 2 and six layers of fingertip sheets 3 arranged between the two, and the front baffle 1, the rear baffle 2 and the fingertips are The pointed piece 3 is connected by rivet riveting or welding. Wherein, the front baffle 1 is an annular plate-like structure, and its main function is to support and protect the fingertip sheet 3. This structure is similar to the front lining ring of the hydrostatic pressure fingertip seal structure, but has the The function of the backing ring and front spacer. The tailgate 2 is also an annular plate-shaped structure, and its main function is to support and protect the fingertip sheet 3. This structure i...

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Abstract

The invention relates to a sealing structure, in particular to a fingertip sealing structure used for controlling leakage of secondary flow in an engine. The involute-type fingertip sealing device comprises a front baffle plate (1), a back baffle plate (2) and a plurality of layers of fingertip chips (3) which are arranged between the front baffle plate and the back baffle plate; the characteristics are as follows: the internal diameter of the fingertip chip is provided with an involute-type finger body (4), and the free end of the finger body (4) forms a sealing boot (5), and the finger bodies (4) between the two adjacent fingertip chips (3) are mutually staggered. Through the design of the involute-type finger body, and combining the characteristics of the fingertip sealing and the fine-toothed comb sealing, the involute-type fingertip sealing structure provided by the invention has good sealing performance, can effectively decrease leakage. Meanwhile, the invention has simple structure, convenient processing, low cost, and is suitable for batch production, and has large actual application value.

Description

technical field [0001] The invention relates to a sealing structure, in particular to a fingertip sealing structure for controlling secondary flow leakage in a gas turbine engine. Background technique [0002] At present, in gas turbine engines, three types of seals are widely used: grate seals, circumferential seals and end face seals. There are certain defects in each of these three structures: although the grate tooth seal has a simple structure, its sealing performance is relatively poor. The grate tooth seal cannot adapt to the centrifugal or thermal expansion of the rotor, so it is necessary to maintain a sufficient gap between the rotor and the stator during design, which reduces the sealing performance, and the leakage flow contains pollution, and auxiliary mechanisms are required to reduce oil leakage. The pressure resistance and temperature resistance of the circumferential seal are relatively low, and its durability cannot meet the requirements of long life, so i...

Claims

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Application Information

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IPC IPC(8): F01D11/12F16J15/16
Inventor 肖育祥周连杰罗健胡海涛汪凯吴瑕徐鹏飞赵亚飞郭永庆
Owner CHINA GAS TURBINE ESTAB
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