Turbine blade tip shroud and mid-span snubber with compound contact angle
AssigneeGeneral Electric Company
InventorsGayathri PURAM, Sheo Narain Giri, Harish Bommanakatte
Life of this patent
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Abstract
A turbine bucket adapted to be supported on a turbine or rotor wheel includes an airfoil portion extending radially relative to a longitudinal axis of the rotor wheel and having a leading edge, a trailing edge, a pressure side and a suction side. At least one tip shroud extends in opposite circumferential directions, the shroud having a first hard face adapted to engage a mating second hard face on a shroud extending circumferentially from an adjacent bucket. The first hard face defined by a surface portion that varies circumferentially with an increasing radius as measured from the longitudinal axis of the rotor wheel.
Claims20
A turbine bucket adapted to be supported on a turbine or rotor wheel comprising:
- an airfoil portion extending radially relative to a longitudinal axis of the rotor wheel and having a leading edge, a trailing edge, a pressure side and a suction side;
- at least one shroud extending in opposite circumferential directions, said shroud having a first hard face adapted to engage a mating second hard face on a shroud extending circumferentially from an adjacent bucket;
- said first hard face defined by a surface portion whose circumferential position varies with increasing radius from the longitudinal axis.
A turbine rotor wheel mounting a plurality of buckets, each bucket having an airfoil portion, said airfoil portion having a leading edge, a trailing edge, a pressure side and a suction side;
- adjacent buckets of said plurality of buckets engageable along contact surfaces provided on tip or mid-span shrouds fixed said airfoil portions, said contact surfaces being inclined in two angular respects to thereby enable relative movement between adjacent tip or mid-span shrouds along said contact surfaces.
A turbine rotor wheel mounting a plurality of buckets, each bucket having an airfoil portion, said airfoil portion having a leading edge, a trailing edge, a pressure side and a suction side;
- adjacent buckets engageable along a first pair of contact surfaces provided on tip shrouds fixed to outer ends of said airfoil portions of said adjacent buckets, and a second pair of contact surfaces provided on mid-span shrouds fixed to pressure and suction sides, respectively, of said airfoil portions of said adjacent buckets, at least one of said pair of contact surfaces on said tip shrouds or said mid-span shrouds being inclined in two directions to thereby provide at least two degrees of freedom of movement for engaged adjacent buckets at the interface between said at least one pair of contact surfaces.
Dependencies are inferred from the claim text.