Patent ID: 6655919
Filing Date: 2003-12-02
Classification: F03B,F05B,Y02E,Y02P,Y10T

Abstract:
Method for assembling a turbine wheel of Pelton type comprising a rim (1), a plurality of buckets (2) distributed over the periphery of this rim and at least one annular flange (5, 6) fast with said rim and provided with housings (7, 8) for receiving said buckets, characterized in that it consists in:pre-positioning, in a housing (7) of said flange, a bucket (2) supported by a part (23C) of its outer convex surface (23) against an edge (71) of said housing, providing a space (Eâ€²) between the convex surface (23B) of the outer radial part (2B) of said bucket and said edge (71); producing an articulated linkage of said bucket (2) on the rim and/or said flange (5) on the inside (2A) of said bucket; exerting on said outer radial part (2B) of said bucket a first calibrated force (F1) to bring it closer to said flange; determining the distance (e) between this outer radial part (2B) and this edge (71) under said force (F1); slackening said force (F1); arranging, between said outer radial part (2B) and said edge (71), a wedge (53) having a thickness substantially equal to said distance (e), and exerting on said outer radial part (2B), and maintaining a second force (F2) to bring it closer to said edge (71), said second force (F2) having an intensity greater than or equal to that of said first force (F1).