SEALING APPARATUS WITH BRUSH

摘要

Provided is a brush sealing device capable of effectively sealing a space between a rotor and a casing to minimize vibration of a turbine, thus improving the efficiency of power generation and the durability of the rotor. The brush sealing device includes a sealing portion provided in the casing of the turbine to seal the flow of a fluid leaking between the casing and a rotor rotating in the casing; a brush portion provided at the sealing portion and including bristles to enclose the outer periphery of the rotor; a shock preventing portion disposed away from a front side of the brush portion at a given interval to block the flow of the fluid flowing along the outer periphery of the rotor; and a bristle plate provided to support the rear side of the brush portion and formed with a plurality of guide holes penetrating to be upward inclined toward the casing side from an inflow direction of the fluid to an outflow direction. The shock preventing portion has a plurality of throttle bosses protruding backward so that the fluid flowing upward along the rear surface opposite to the brush portion is throttled, and a throttle groove connecting each throttle boss disposed vertically in a multiple stage on the shock preventing portion. Each guide hole is disposed in a vertical direction and a circumferential direction of the bristle plate. A fluid inlet portion of the guide hole formed at the uppermost side of the bristle plate is disposed at a height higher than the installation height of the throttle boss formed at the uppermost side of the shock preventing portion.