FRANCIS TURBINE OR FRANCIS PUMP OR FRANCIS PUMP TURBINE

摘要

The invention relates to a Francis turbine or other machine built according to the Francis principle; with an impeller having rotor blades; with a volute housing that surrounds the impeller; with a traverse ring comprising a number of traverses; with an inner rotor blade ring having larger traverses, which is arranged downstream of the traverse ring. The invention is characterised by the following features: suggested is an outer rotor blade ring that is arranged upstream of the traverse ring; a part of the traverse ring extends with larger traverses over a part of the circumference of the impeller, beginning at the start of the volute, and a part of the traverse ring extends with smaller traverses over the broader circumference of the impeller as far as the end of the volute.