Fluid reaction surfaces (i.e. – impellers) – With fluid passage in working member communicating with... – Air and watercraft propellers
Reexamination Certificate
2005-06-28
2005-06-28
Look, Edward K. (Department: 3745)
Fluid reaction surfaces (i.e., impellers)
With fluid passage in working member communicating with...
Air and watercraft propellers
C416S09600A, C416S09700R
Reexamination Certificate
active
06910864
ABSTRACT:
First, second and third sets of cooling holes are provided in a turbine airfoil. The first set of holes adjacent a leading edge have turbulators commencing at a predetermined distance from the root of the airfoil and terminating short of the airfoil tip. A second set of cooling holes have turbulators commencing at a greater distance from the platform than the turbulators of the first set and terminating short of the airfoil tip at a greater distance from the tip than the turbulators of the first set of holes. A third set of holes adjacent the trailing edge has smooth bores. The size, location, style and configuration of the cooling holes increases bulk creep part life and overall efficiency of the turbine.
REFERENCES:
patent: 3329596 (1967-07-01), Abt et al.
patent: 5117626 (1992-06-01), North et al.
patent: 5413463 (1995-05-01), Chiu et al.
Look Edward K.
Nixon & Vanderhye P.C.
White Dwayne J.
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