Francis-type runner for a hydraulic machine, hydraulic machine including such a runner, and method for assembling such a runner
AssigneeALSTOM Renewable Technologies
InventorsYves Bouvet, Fabrice Tassy, Louis Mathieu, Georges Rossi
Life of this patent
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Abstract
The present invention relates to a Francis runner for a hydraulic machine that comprises a belt with a rotational symmetry about a central axis of the runner, a ceiling with a rotational symmetry about the axis, and a plurality of blades (21, 22) extending between the ceiling and the belt. The runner also includes at least two elements (41, 42, 43, 61, 62, 63) partially defining at least the belt and/or the ceiling while at least one edge (231, 232, 241, 242) of a blade (21, 22) is inserted between the two elements defining the belt and/or the ceiling.
Claims9
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.
A method of assembling a runner, comprising the following steps:
- A) manufacturing band elements and crown elements, and
- B) assembling the band elements and the crown elements with at least one blade by welding and/or through casting, with a first edge of the at least one blade being arranged between two adjacent band elements and a second edge of the at least one blade arranged between two adjacent crown elements wherein the first edge and the second edge of the at least one 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.
Dependencies are inferred from the claim text.