A multi-stage brush seal with differential structure at various levels

Abstract

The invention discloses a multi-stage brush seal with differentiated structures at various levels, comprising: a brush seal installation seat, a multi-stage brush seal unit and a partition, and the brush seal units at all levels include brush wire bundles, a front block Plate and rear baffle, along the direction of the brush seal unit from the upstream stage to the downstream stage, the radial clearance between the free ends of the brush filament bundles of each stage and the rotor surface increases step by step, and the free end of the brush filament bundles of the first stage and the rotor surface There is interference between them, the diameter of the brush filaments at each level and the circumferential inclination of the brush filament bundles increase step by step, the density and thickness of the brush filament bundles at each level decrease step by step, and the distance between the back baffle and the brush filament bundles of each level The axial distance between them increases step by step, the height of the rear baffles of each level increases step by step, and the radial clearance between the front baffles of each level and the surface of the rotor increases step by step. The multi-stage brush seal can solve the problem of unbalanced pressure drop at all levels in the traditional multi-stage brush seal, avoid premature failure due to excessive pressure drop of a certain brush wire, and ensure the service life of the multi-stage brush seal.

Description

technical field [0001] The invention relates to the field of turbomachinery rotary dynamic seals, and in particular provides a multi-stage brush seal with differentiated structures at various stages. Background technique [0002] The brush seal is a contact dynamic seal with excellent performance, which has strong adaptability to the instantaneous eccentric whirl of the rotor. At present, brush seals have been widely used in aeroengines, gas turbines and steam turbines as a substitute for labyrinth seals. The pressure bearing capacity of single-stage brush seal is limited. Therefore, multi-stage brush seal is usually used under the condition of large pressure difference. However, the geometric parameters of the existing multi-stage brush seal structure are the same at all levels. During the working process of the structure, due to the step-by-step increase of the air flow volume flow through the brush seals of each level, the pressure drop of the downstream stage will alway...

AI Technical Summary

Problems solved by technology

[0004] In view of this, the object of the present invention is to provide a multi-stage brush seal with differentiated structure at each stage, so as to solve the problem that the existing multi-stage brush seal is prone to excessive pressure drop in the downstream stage due to the same geometric parameters at each stage, which leads to seal failure. premature failure problem

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