Patent ID: 6589012
Filing Date: 2003-07-08
Classification: F01D

Abstract:
A steam turbine comprising:a rotatable component including a rotor shaft and a non-rotatable component about said rotatable component; a brush seal carried by said non-rotatable component for sealing engagement with the rotatable component; first and second wheels on said rotatable component spaced axially from one another; said rotatable component including a plurality of buckets spaced circumferentially from one another on each of said wheels; means for inhibiting non-uniform circumferential heat transfer to the rotatable component thereby to eliminate or minimize bow of the rotatable component due to frictional contact between the brush seal and the rotatable component; said inhibiting means including an annular platform projecting radially outwardly of an outer surface of and from said rotor shaft at an axial location between said first and second wheels; flanges extending axially from the buckets on said second wheel in a direction toward said platform and said first wheel and spaced radially outwardly of the outer surface of the rotor shaft; said brush seal disposed between said buckets and engaging a sealing surface on said platform radially outwardly of said outer surface; and at least one labyrinth seal tooth extending between said stationary component and said bucket flanges.