Patent ID: 6669443
Filing Date: 2003-12-30
Classification: F01D

Abstract:
A steam turbine comprising:a rotatable component including a rotor shaft having a rotor shaft surface 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; at least a pair of 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 rotor shaft surface due to heat generated by frictional contact between the brush seal and the rotatable component thereby to eliminate or minimize bow of the rotatable component; said inhibiting means including an annular platform projecting radially outwardly of said rotor shaft surface at an axial location between said wheels; said brush seal being disposed between said buckets on said wheels and engaging a sealing surface on said platform radially outwardly of said rotor shaft surface; said platform including an annular extending pedestal having a neck and at least one flange extending axially toward one of said wheels and away from said neck, said sealing surface being located on said platform flange.