Self-concentric brush seal structure with rotor provided with discs

Abstract

A self-concentric brush seal structure with a rotor provided with discs comprises a brush seal part composed of a fusion welding area, a front baffle, a rear baffle and a brush wire bundle, a stator box, C-shaped seal rings, W-shaped seal rings, wear-resistant coatings, a bearing plate, the front disc, the rear disc and the rotor. The C-shaped seal rings are embedded into the neck surfaces of the front baffle and the rear baffle and are matched with the stator box. The W-shaped seal rings are clamped in the axial direction and the radial direction through the brush seal part and the stator box. The front disc is located at the lower end of the front baffle and is vertically fixed to the surface of the rotor, and the rear disc is located at the lower end of the rear baffle and is vertically fixed to the surface of the rotor. The self-concentric brush seal structure is simple; compared with traditional fixed brush seals, the self-concentric brush seal structure has the advantages that the brush seal part can move freely in the radial direction by being clamped in the stator box through the C-shaped seal rings and the W-shaped seal rings and can move along with the rotor for keeping self-concentric when the rotor moves in the radial direction, and continuous damage caused by direct rubbing between the rotor and the brush seal part can be avoided.

Description

technical field [0001] The invention relates to a dynamic sealing structure applied to rotating machines, in particular to a self-concentric brush-type sealing structure with discs in the rotor. Background technique [0002] Brush seals are key components of rotating machinery such as aero-engines, steam turbines, and compressors. Compared with the traditional labyrinth seal, the brush seal not only has better sealing characteristics, but also is a flexible contact dynamic sealing technology, which can adapt to the instantaneous radial deformation or eccentric movement of the rotor. In addition, the brush wire of the brush seal The flexible contact with the rotor shaft can improve the vibration characteristics of the rotor system and ensure the safety of the unit operation. Therefore, brush seals are widely used in rotating machinery in aerospace, electric power, petrochemical and other industries. [0003] The brush seal is composed of the front baffle, the rear baffle and...

AI Technical Summary

Problems solved by technology

[0004] Studies have shown that under the action of the high gas pressure difference between the upstream and downstream of the brush filament bundle, the traditional brush seal will bend axially and cling to the rear baffle, and the friction between the brush filament and the rear baffle prevents the brush filament from sealing in time. Deformation, so that the brush wire cannot be deformed in time to follow the speed-up of the rotor or the increase in vortex eccentricity, resulting in the stiffening effect of the brush wire

The stiffening effect will cause accelerated wear of the brush wire and the rotor raceway, reducing the sealing performance of the brush seal and shortening the service life

In addition, as the rotor slows down or returns to a smaller vortex eccentric position, the friction between the brush filament and the rear baffle prevents the brush filament from recovering immediately, and the brush filament hangs and the brush filament hysteresis effect occurs

The stiffening effect and hysteresis effect will accelerate the friction between the brush wire and the rotor surface, reduce the sealing performance of the brush seal, increase the gas leakage, and shorten the service life, and there is an obvious through effect between the inlet and outlet of the traditional brush seal, making The fluid will flow out with a high axial jet flow, causing the free end of the brush wire to bend or even break, seriously affecting the sealing performance and service life of the brush seal

[0005] In addition, the design and installation of traditional brush seals are centered relative to the installation casing and are fixedly installed. As a result, when the rotor undergoes radial eccentric movement, the brush seal cannot automatically avoid it and irreversible friction with the rotor occurs, reducing the brush seal. Seal service life

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