High-pressure-difference-resistance brush seal device

Abstract

The invention belongs to the technical field of sealing of aircraft engines, and relates to a high-pressure-difference-resistance brush seal device. The high-pressure-difference-resistance brush sealdevice comprises a brush wire, the brush wire comprises a fixed end and a friction end, the fixed end is fixed to an aeroengine casing baffle in the circumferential direction, the friction end extendsin the radial direction of the aeroengine casing baffle from the fixed end and is in contact with an engine rotor runway, and a gap is formed between the brush wire and the side wall of the groove; the side wall, lower than the low pressure side, of the groove is provided with a backboard elastic ring, and the backboard elastic ring is coaxial with an engine rotor and is provided with a front endand a rear end in the axial direction, wherein the rear end is fixed to the side wall of the groove through a wave spring, the front end extends to be in contact with the brush wire, and the contactend is located between the fixed end and the friction end of the brush wire. According to the high-pressure-difference-resistance brush seal device, through the backboard elastic ring, the equivalentaxial rigidity of the brush wire under high pressure is improved, the high-pressure-difference-resistance brush seal device has self-adaptation capability on sealing pressure differences, the using requirements for different sealing pressure differences can be well met, and the sealing effect is good.

Description

technical field [0001] The application belongs to the technical field of aero-engine sealing, and in particular relates to a high-pressure-difference-resistant brush-type sealing device. Background technique [0002] The ring cavity formed by the aero-engine rotor and the casing is divided into a high-pressure cavity and a low-pressure cavity, and the two need to be sealed. Since the rotor rotates relative to the casing, the seal here is a dynamic seal, and a grate seal or brush is generally used. type seal. [0003] The brush seal has good sealing performance, and its leakage is only half or even lower than that of the straight tooth grate seal with the same sealing radius of 5 under the same working conditions. Therefore, in high-performance aeroengines and gas turbines, brush seals are preferred to seal the air flow path or balance axial forces. Due to the large sealing pressure difference in the working condition of high thrust ratio aero-engines, the pressure bearing ...

AI Technical Summary

Problems solved by technology

However, increasing the diameter of the brush wire will increase the friction between the brush wire and the runway, increase the weight of the brush wire, and reduce the life of the brush seal. The design of the gap between the back plate and the brush wire bundle increases the brush seal. Leakage at low differential pressure reduces the sealing performance of the brush seal

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