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Removable inner turbine shell with bucket tip clearance control

United States Patent

6,082,963
July 4, 2000
View the Complete Patent at the US Patent & Trademark Office
A turbine includes a plurality of inner shell sections mounting first and second stage nozzle and shroud portions. The inner shell sections are pinned to an outer containment shell formed of sections to preclude circumferential movement of the inner shell relative to the outer shell and enable thermal expansion and contraction of the inner shell relative to the outer shell. Positive bucket tip clearance control is afforded by passing a thermal medium about the inner shell in heat transfer relation with the shrouds about the first and second stage bucket tips, the thermal medium being provided from a source of heating/cooling fluid independent of the turbine. Access is provided to the rotor and turbine buckets by removing the outer and inner shell sections.
Sexton; Brendan F. (Clifton Park, NY), Knuijt; Hans M. (Niskayuna, NY), Eldrid; Sacheverel Q. (Saratoga Springs, NY), Myers; Albert (Amsterdam, NY), Coneybeer; Kyle E. (Schenectady, NY), Johnson; David Martin (Ballston Lake, NY), Kellock; Iain R. (Clifton Park, NY)
General Electric Co. (Schenectady, NY)
09/ 249,047
February 12, 1999
This invention was made with Government support under Contract No. DE-FC21-95MC311876 awarded by the Department of Energy. The Government has certain rights in this invention.