Patent ID: 8662826
Filing Date: 2014-03-04
Classification: F01D

Abstract:
1. A multi-stage steam turbine with a steam cooling circuit for multiple front stages of a drum rotor, the steam turbine comprising: a drum rotor; a cooling steam source; a tangential female dovetail slot cut around an outer radial circumference for at least one of a plurality of stages of the drum rotor; at least one axial female dovetail slot cut into at least one drum rotor projection between at least one of the plurality of stages of the drum rotor; at least one axial male dovetailed insert conformed to insert into the at least one axial female dovetail slot; and an axial steam cooling passage formed at least one of through and around the axial male dovetailed insert, and wherein the axial cooling passage around the axial male dovetail includes a cutout portion at an inner radial end bounded by a base of the axial female dovetail slot.