Methods and systems for assembling shrouded turbine bucket...

Details Methods and systems for assembling shrouded turbine bucket... Methods and systems for assembling shrouded turbine bucket...

2005-06-02

2008-03-18

Look, Edward K. (Department: 3745)

Fluid reaction surfaces (i.e., impellers)

Specific working member mount

Blade received by continuous circumferential channel

C416S218000, C416S222000

Reexamination Certificate

active

07344359

ABSTRACT:
Rhombic shrouded tangential entry buckets are circumferentially applied to the rotor wheel rim of a turbine. A fixture is releasably secured to a lug on each bucket and includes a chamfered surface for engaging a complementary surface on the lug. Upon applying a tangential assembly force, the shroud and airfoil of adjacent buckets are pre-twisted in a rotational direction about a generally radial axis enabling dovetail faces to contact one another notwithstanding interference fit shroud contacting surfaces. The removal of the fixture from the lug enables the bias of the airfoil to rotate the shroud in an opposite direction into final assembly with the shroud edges of adjacent buckets in contact with one another and the dovetail faces thereof in contact with one another.

REFERENCES:
patent: 5509784 (1996-04-01), Caruso et al.
patent: 2006/0127221 (2006-06-01), Yamashita et al.

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