Low-leakage fingertip seal structure for increasing lift force of sealing shoe

Abstract

The invention discloses a low-leakage fingertip seal structure for increasing lift force of a sealing shoe. The low-leakage fingertip seal structure comprises a front baffle, a high-pressure sealing piece, a low-pressure sealing piece and a rear baffle which are sequentially connected through rivets from the high-pressure side to the low-pressure side. The low-pressure sealing piece comprises a fingertip beam, the sealing shoe and a shoe tip small wing. The sealing shoe is vertically connected to the bottom end of the fingertip beam and extends towards the low pressure side, a sealing gap is formed between the lower portion of the high-pressure sealing piece and the outer surface of a rotor, a sealing gap is formed between the bottom of the sealing shoe and the outer surface of the rotor, the shoe tip small wing is arranged on the side, axially close to the low-pressure area, of the sealing shoe, and the shoe tip small wing extends outwards in the radial direction of the rotor. According to the low-leakage fingertip seal structure for increasing lift force of the sealing shoe, the fluid dynamic pressure effect of the non-contact type fingertip seal is enhanced through the shoe tip small wing, the lift force of the sealing shoe is improved, the fingertip beam bounces along with a rotor and has better following performance, abrasion to the sealing shoe due to rotor bounce is reduced, the service life of the fingertip seal is prolonged, and the sealing character of the fingertip seal is improved.

Description

technical field [0001] The invention relates to the field of dynamic sealing of turbomachinery, and in particular provides a low-leakage fingertip sealing structure which increases the lift force of a sealing shoe. Background technique [0002] With the improvement of the performance of aero-engines, engine failures due to seal failures occur from time to time. Compared with improving the structural performance of aerodynamic components of the engine, improving and developing new sealing structures and technologies proves to be more profitable and costly. It is an important and feasible way to improve the performance of the engine significantly. [0003] The grate tooth seal is a widely used sealing structure in aero-engines, but this kind of seal belongs to the gap seal, and the degree of fluid leakage is relatively serious. The brush seal is a flexible seal proposed to make up for the defects of the grate tooth seal. The performance can adapt to the change of the relative...

AI Technical Summary

Problems solved by technology

[0007] In view of this, the object of the present invention is to provide a low-leakage fingertip seal structure that increases the lift force of the seal shoe, so as to solve the problems of poor sealing performance of the existing fingertip seal structure, short service life of the rotor and the seal shoe, etc.

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