Brush seal and turbine using the same

Abstract

A brush seal in which an increase in steady-state wear is prevented and the influence of turbulence is eliminated is provided. The invention includes a brush seal including brush seal bristles formed of a plurality of wires and mounted to a seal box in such a manner that one end thereof is in contact with a downstream cylindrical portion; and a downstream support plate mounted next to the brush seal bristles in a direction in which combustion gas flows, for restricting the motion of the brush seal bristles. The brush seal seals the combustion gas flowing between the seal box and the downstream cylindrical portion. The brush seal includes restraint bristles mounted opposite to the downstream support plate and next to the brush seal bristles in the direction in which the combustion gas flows. The restraint bristles have a degree of elasticity such that the downstream cylindrical portion is not damaged even if coming into contact with the downstream cylindrical portion and such that the contact deformation of the brush seal bristles is not hindered.

1 . A brush seal comprising:
 a bristle section formed of a plurality of bristles and mounted to a stationary section in such a manner that one end thereof is in contact with a rotating section; and   a brake section mounted next to the bristle section in a direction in which fluid flows, for restricting the motion of the bristle section, the brush seal sealing the fluid flowing between the stationary section and the rotating section, wherein   the brush seal includes a restraint section mounted opposite to the brake section and next to the bristle section in the direction in which the fluid flows, the restraint section having a degree of elasticity such that the rotating section is not damaged even if coming into contact with the rotating section and such that the contact deformation of the bristle section is not hindered.   
   
   
       2 . The brush seal according to  claim 1 , wherein the restraint section is disposed upstream of the bristle section in the direction in which the fluid flows. 
   
   
       3 . The brush seal according to  claim 1 , wherein the restraint section is a bundle of bristles formed of a plurality of bristles whose end is farther away from the rotating section than the end of the bristles. 
   
   
       4 . The brush seal according to  claim 2 , wherein the restraint section is a bundle of bristles formed of a plurality of bristles whose end is farther away from the rotating section than the end of the bristles. 
   
   
       5 . A turbine that uses the brush seal according to  claim 1 . 
   
   
       6 . A turbine that uses the brush seal according to  claim 2 . 
   
   
       7 . A turbine that uses the brush seal according to  claim 3 .