Reduced weight control stage for a high temperature steam...

Details Reduced weight control stage for a high temperature steam... Reduced weight control stage for a high temperature steam...

2006-09-12

2006-09-12

Nguyen, Ninh H. (Department: 3745)

Fluid reaction surfaces (i.e., impellers)

Specific blade structure

Hollow

C416S248000

Reexamination Certificate

active

07104762

ABSTRACT:
The control stage buckets for a steam turbine have airfoils which are hollowed out to form an interior cavity within the airfoil. The cavity opens through the radial inner platform of the bucket and terminates short of the tip of the bucket. The buckets are therefore of reduced weight. This reduced weight causes reduced creep damage in the axially extending dovetails along the rotor rim.

REFERENCES:
patent: 2639119 (1953-05-01), Greenwald
patent: 4142824 (1979-03-01), Andersen
patent: 5062769 (1991-11-01), Ortolano
patent: 6923616 (2005-08-01), McRae et al.

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