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Apparatus and methods for aligning holes through wheels and spacers and stacking the wheels and spacers to form a turbine rotor

United States Patent

December 12, 2000
View the Complete Patent at the US Patent & Trademark Office
A gas turbine rotor stacking fixture includes upstanding bolts for reception in aligned bolt holes in superposed aft disk, wheels and spacers and upstanding alignment rods received in openings of the disk, wheels and spacers during the rotor stacking assembly. The axially registering openings enable insertion of thin-walled tubes circumferentially about the rim of the rotor, with tight tolerances to the openings to provide supply and return steam for cooling buckets. The alignment rods have radial dimensions substantially less than their dimensions in a circumferential direction to allow for radial opening misalignment due to thermal expansion, tolerance stack-up and wheel-to-spacer mismatch due to rabbet mechanical growth. The circumferential dimension of the alignment rods affords tightly toleranced alignment of the openings through which the cooling tubes are installed.
Berry; Robert Randolph (Greenville, SC), Palmer; Gene David (Clifton Park, NY), Wilson; Ian David (Clifton Park, NY)
General Electric Co. (Schenectady, NY)
09/ 275,633
March 24, 1999
This invention was made with Government support under Contract No. DE-FC21-95MC31176 awarded by the Department of Energy. The Government has certain rights in this invention.