Patent ID: 9702261
Date: 2017-07-11
CPC Classifications: F01D,F05D,Y10T

Claim:
1. A steam turbine comprising: a housing; a steam inlet coupled in flow communication to said housing and configured to discharge a first steam flow within said housing; a stator coupled to said housing and comprising a plurality of vanes; and a rotor coupled to said housing and located within said stator, said rotor and said stator define a first flow path therebetween and in flow communication with the first steam flow, said rotor comprising at least an upstream stage and an adjacent downstream stage, wherein the upstream and downstream directions are defined by the first steam flow, each of said upstream and downstream stages comprising a plurality of blades coupled to said rotor, at least one root of said plurality of blades of said downstream stage comprising a first side, a second side and a passageway extending through said root in flow communication with said first side and said second side, said passageway is configured to receive a portion of the first steam flow from said first flow path at said second side and to discharge the portion of the first steam flow from said first side, said at least one root of said plurality of blades of said downstream stage comprises a first angel wing extending upstream from said first side, at least one root of said plurality of turbine blades of said upstream stage comprises a second angel wing extending downstream and adjacent to said first angel wing, said first and second angel wings configured to cooperate to seal the discharged portion of the first steam flow from said first flow path.