Axial entry dovetail segment for securing a closure bucket to a

Details Axial entry dovetail segment for securing a closure bucket to a Axial entry dovetail segment for securing a closure bucket to a

1998-09-14

2000-02-29

Look, Edward K.

Fluid reaction surfaces (i.e., impellers)

Specific working member mount

Blade received in well or slot

416204A, 416248, 416191, 416193A, B63H 126

Patent

active

060301783

ABSTRACT:
In a turbine having a rotor wheel with axially extending female dovetails spaced circumferentially one from the other about the circumference of the wheel, buckets having male dovetails at their radially inner ends are axially inserted relative to the rotor wheel to secure the buckets to the wheel. Where the buckets have shrouds at their radial outer ends prohibiting axial entry and assembly of the final or closure bucket onto the wheel, an axial entry dovetail segment having radially opposite male dovetails is employed to secure the final or closure bucket to the wheel. The final bucket includes a female dovetail at its radial inner end while the axial entry dovetail segment has radial inner and outer male dovetails. By radially inserting the final bucket between adjacent buckets nesting its cover with the covers of adjacent blade covers, axial insertion of the segment with the male dovetails engaging the female dovetails of the final bucket and rotor wheel finally secures the final bucket to the rotor wheel.

REFERENCES:
patent: 3627448 (1971-12-01), Rupp et al.
patent: 4904160 (1990-02-01), Partington
patent: 5509784 (1996-04-01), Caruso et al.

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