An interaxial finger seal

Abstract

The invention discloses a between-shafts finger seal device. The between-shafts finger seal device is composed of an outer stretching between-shafts finger seal structure and an inner stretching between-shafts finger seal structure. The outer stretching between-shafts finger seal structure is installed on an inner shaft, and the inner stretching between-shafts finger seal structure is installed on an outer shaft. The outer stretching between-shafts finger seal structure and the inner stretching between-shafts finger seal structure each comprises a plurality of finger seal pieces, a front baffle, a rear baffle and an elastic component. A plurality of finger curved beams and finger boots are machined on the finger seal pieces. The molded line of the finger curved beams is any one of an involute, a circular arc or a common polynomial function curve. The finger boots make contact with the surfaces of the rotary shafts to form sealing interfaces. Radial clearances are reserved between the front baffles, the rear baffles and the finger seal pieces, and the elastic components are placed in the clearances correspondingly so as to compensate outward movement of the finger curved beams and displacement perturbation of the inner rotary shaft and the outer rotary shaft under the action of centrifugal force. The between-shafts finger seal device adopts flexible sealing and is prepared from carbon-carbon composites with good abrasion resistance, the machining cost is low, the efficiency is high, assembly and adjustment are easy, and the sealing performance and abrasion resistance of between-shafts sealing are promoted.

Description

technical field [0001] The invention relates to the technical field of inter-shaft seals of aero-engines, in particular to a finger-type sealing device used for reversing inter-shafts of aero-engines. Background technique [0002] In aero-engines, in order to improve performance, shorten the rotor support distance and reduce structural weight, the high-pressure turbine rotor is usually supported on the low-pressure turbine rotor, so the high, medium and low-pressure turbines rotating on the same axis and the compressor and fan driven by them Between the connecting shafts, intermediate bearings are required for support. The seals between these intermediary bearing chambers and the air flow channels between the shafts are inter-shaft seals. Some advanced engines use two engine rotors that rotate in opposite directions, and the sliding speed of the intershaft seal surface will be doubled. This kind of inter-shaft seal is not only installed in the limited space between the hig...

AI Technical Summary

Problems solved by technology

In the Chinese patent CNIO4500743A, an end face sealing ring is adopted, and the number of parts is reduced, but the main structure does not change much

However, the manufacturing cost of the brush seal itself is very high, and it is difficult to strictly control the arrangement of many brush filaments, and there is a risk of corrosion and fracture of the brush filaments at high temperature and high speed.

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