Stress relief grooves for Francis turbine runner blades

Details Stress relief grooves for Francis turbine runner blades Stress relief grooves for Francis turbine runner blades

2006-03-06

2010-06-15

Look, Edward (Department: 3745)

Fluid reaction surfaces (i.e., impellers)

Rotor having flow confining or deflecting web, shroud or...

Radially extending web or end plate

C416S23100A, C416S235000, C416S500000

Reexamination Certificate

active

07736128

ABSTRACT:
There is disclosed a runner for a Francis-type hydraulic turbine where each runner blade has an outlet edge with two stress relieving grooves cut through the blade from the outlet edge adjacent the crown and the band. The grooves each present an opening across the outlet edge and the grooves each extend a predetermined distance from the outlet edge into the blade.

REFERENCES:
patent: 4479757 (1984-10-01), Holmes et al.
patent: 7097422 (2006-08-01), Rice et al.
patent: 7160084 (2007-01-01), Ahmad
patent: 2006/0039791 (2006-02-01), Kim
patent: WO 98/05863 (1998-02-01), None

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