Torque-tuned, integrally-covered bucket and related method

Details Torque-tuned, integrally-covered bucket and related method Torque-tuned, integrally-covered bucket and related method

2005-02-25

2009-06-16

Edgar, Richard (Department: 3745)

Fluid reaction surfaces (i.e., impellers)

Rotor having flow confining or deflecting web, shroud or...

Axially extending shroud ring or casing

C416S248000

Reexamination Certificate

active

07547192

ABSTRACT:
A turbine bucket includes a shank portion, an adjacent and radially inner dovetail mounting portion, an adjacent and radial outer airfoil portion, with a platform at a radially inner end of said airfoil portion adjacent the shank portion, and an integral cover at a radially outer tip of the airfoil portion, wherein the shank portion is shaped to provide a torque zone establishing a desired torque characteristic for the bucket to create, upon insertion into a dovetail groove on a turbine wheel, a desired contact pressure between the integral cover and adjacent covers in a row of similar buckets.

REFERENCES:
patent: 2315610 (1943-04-01), Flanders
patent: 4497613 (1985-02-01), Carreno
patent: 5509784 (1996-04-01), Caruso et al.
patent: 6158104 (2000-12-01), Roberts et al.
patent: 2004/0165989 (2004-08-01), Caruso et al.
patent: 2006/0127221 (2006-06-01), Yamashita et al.

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