Bucket and wheel dovetail design for turbine rotors

Details Bucket and wheel dovetail design for turbine rotors Bucket and wheel dovetail design for turbine rotors

1994-10-12

1995-12-12

Look, Edward K.

Fluid reaction surfaces (i.e., impellers)

Specific working member mount

Blade straddles carrier

416219R, F01D 532

Patent

active

054744237

ABSTRACT:
A dovetail joint between a rotor wheel and a bucket includes a male dovetail component on the rotor wheel and a female dovetail component in the bucket, wherein the male dovetail component includes four laterally projecting hooks, each hook from an uppermost hook to a lowermost hook decreasing in radial thickness and increasing in axial length. Each hook has a substantially flat top surface to effectively increase the average thickness, and a neck between the respective hooks having enlarged fillets. The new dovetail joint reduces peak stresses so as to avoid or minimize stress corrosion cracking.

REFERENCES:
patent: 2277484 (1942-03-01), Flanders
patent: 3045968 (1962-07-01), Willis
patent: 3079681 (1963-03-01), Fentiman
patent: 4702673 (1987-10-01), Hansen et al.
patent: 4824328 (1989-04-01), Pisz et al.
patent: 5147180 (1992-09-01), Johnson
patent: 5160242 (1992-11-01), Brown
patent: 5176500 (1993-01-01), Heinig

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