Patent ID: 9175662
Filing Date: 2015-11-03
Classification: F03B,F05B,Y02E,Y02P,Y10T

Abstract:
1. A Francis-type runner for a hydraulic machine, comprising: a band with symmetry of revolution about a central axis of the runner, a crown with symmetry of revolution about the axis, and a plurality of blades extending between the crown and the band, at least two elements at least partially defining the band and at least two elements at least partially defining the crown, and wherein a first edge of each blade is arranged between two adjacent band elements and a second edge of each blade is arranged between two adjacent crown elements wherein the first edge and the second edge of each blade lies flush with exterior surfaces of the respective adjacent band elements and adjacent crown elements, wherein each band element and each crown element being fixed between two adjacent blades by welding, edges of each of the band elements and edges of each of the crown elements fixed to respective blades being beveled to define chamfers for welding.