EXPANDING LOCK PIN FOR TURBINE SIDE ENTRY BLADE

摘要

An expanding lock pin for side entry turbine blades for turbines, including steam turbines compensates for worn or oversize mating pin grooves formed in rotor steeples and blade roots. The expanding pin expands circumferentially to fill the oversize mating groove. In one embodiment of the expanding lock pin a tapered plug mates with a mating tapered aperture formed in the pin. As the plug is driven into the pin its circumference increases. The expanding lock pin eliminates the need to re-machine worn or oversize pin grooves or machine new grooves.

主权项

1. A method for locking a side entry turbine blade to a turbine rotor of a turbine, comprising:
inserting a turbine blade root between a pair of opposed rotor steeples; aligning a blade root pin groove formed in the blade root with a corresponding steeple pin groove formed in one of the steeples and forming a lock pin channel with the respective grooves; inserting a distal end of a circumferentially expandable lock pin into the lock pin channel; and expanding the lock pin circumference in abutting contact relationship with the respective rotor steeple and blade root grooves forming the lock pin channel.