Alstom Power Hydro

Louis Finet

Georges Rossi

Jean-Marie Roman

Bernard Michel

Francis Freynet

The invention concerns a method which consists in: pre-positioning, in a housing ( ) of a flange ( ), a bucket ( ) supported by part ( ) of its outer surface ( ) against an edge ( ) of the housing ( ) providing a space (E&prime;) between the convex surface ( B) of the outer radial part ( B) of the bucket ( ) and said edge ( ); producing an articulated linkage ( ) of the bucket ( ) on the rim ( ) and/or the flange ( ) on the inside ( A) of the bucket ( ); exerting on the outer radial part ( B) of the bucket ( ) a first calibrated force to bring it closer to the edge ( ); determining the distance (e) between said outer radial part ( B) and said edge ( ) under said force; slackening said force; arranging, between said outer radial part ( B) and said edge ( ), a wedge ( ) having a thickness substantially equal to said distance (e); and exerting on the outer radial part ( B) of the bucket a second force (F ) to bringing it closer to the edge and maintaining said second force (F ) which has an intensity not less than that of the first force.

Method for assembling a pelton turbine wheel

The invention concerns a Pelton turbine wheel comprising a rim ( ) and several buckets ( ) distributed at the rim periphery, characterised in that it comprises at least a ring-shaped flange ( ) integral with the rim and provided with housings ( ) for receiving the buckets. The flange is capable of absorbing at least part of the efforts transmitted by the buckets ( ) to the rim ( ) and forms a peripheral strip ( ) at external radial zones of the housings ( ). The transmission of the efforts from the buckets ( ) to the wheel rim ( ) is carried out without generating too considerable a concentration zone of mechanical stresses.

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Vif, France

Louis Finet