Stress relief grooves for Francis turbine runner blades
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United States of America Patent
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-
Jun 15, 2010
Grant Date -
Oct 12, 2006
app pub date -
Mar 6, 2006
filing date -
Apr 7, 2005
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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