초록 ▼

A seal assembly and a rotary machine, such as a steam turbine, containing such seal. A stator circumferentially surrounds a row of rotor blades. The stator includes an upstream tooth-seal region, a downstream brush-seal region, and an intervening fluid expansion chamber all radially near the blade t

A seal assembly and a rotary machine, such as a steam turbine, containing such seal. A stator circumferentially surrounds a row of rotor blades. The stator includes an upstream tooth-seal region, a downstream brush-seal region, and an intervening fluid expansion chamber all radially near the blade tips. Debris in the fluid stream is broken down into smaller particles by the tooth-seal region, and the smaller particles are slowed down by the fluid expansion chamber such that minimal damage is caused to the downstream bristles in the brush seal region.

대표청구항 ▼

[ What is claimed is:] [1.] A seal assembly comprising an arcuate member having a longitudinal axis and a radially inward side facing said longitudinal axis,wherein said radial inward side includes a longitudinal upstream portion and a longitudinal downstream portion,wherein said longitudinal upstre

[ What is claimed is:] [1.] A seal assembly comprising an arcuate member having a longitudinal axis and a radially inward side facing said longitudinal axis,wherein said radial inward side includes a longitudinal upstream portion and a longitudinal downstream portion,wherein said longitudinal upstream portion includes a plurality of longitudinally spaced-apart, circumferentially extending, and radially-inward-protruding seal teeth,wherein said longitudinal downstream portion includes a circumferentially extending brush seal having a multiplicity of bristles, said brush seal longitudinally spaced apart from said seal teeth, and said bristles protruding radially inward when viewed in a cross section of said arcuate member taken by a cutting plane wherein said longitudinal axis lies in said cutting plane, andwherein said radially inward side has a radius which varies longitudinally such that said radius is larger, longitudinally between said brush seal and a longitudinally-closest one of said seal teeth to said brush seal, than longitudinally between said seal teeth of a longitudinally-closest pair of said seal teeth to said brush seal.