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Bore tube assembly for steam cooling a turbine rotor

United States Patent

August 20, 2002
View the Complete Patent at the US Patent & Trademark Office
An axial bore tube assembly for a turbine is provided to supply cooling steam to hot gas components of the turbine wheels and return the spent cooling steam. A pair of inner and outer tubes define a steam supply passage concentric about an inner return passage. The forward ends of the tubes communicate with an end cap assembly having sets of peripheral holes communicating with first and second sets of radial tubes whereby cooling steam from the concentric passage is supplied through the end cap holes to radial tubes for cooling the buckets and return steam from the buckets is provided through the second set of radial tubes through a second set of openings of the end cap into the coaxial return passage. A radial-to-axial flow transitioning device, including anti-swirling vanes is provided in the end cap. A strut ring adjacent the aft end of the bore tube assembly permits axial and radial thermal expansion of the inner tube relative to the outer tube.
DeStefano; Thomas Daniel (Ballston Lake, NY), Wilson; Ian David (Clifton Park, NY)
General Electric Company (Schenectady, NY)
09/ 566,726
May 9, 2000
This invention was made with Goverment support under Contract No. DE-FC21-95MC31176 awarded by the Department of Energy. The Government has certain rights in this invention.