US 2015/0192101 A1Published application

Method for fabricating a francis-type runner for a hydraulic machine, and runner fabricated using such a method

OwnerGeorges Auguste ROSSI, Guillaume RUDELLE +3inventors

InventorsGeorges Auguste ROSSI, Guillaume RUDELLE, Eric BARTHELET, Stéphane MEYNIEL, Louis MATHIEU

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Abstract

The method relates to the fabrication of a Francis-type runner for a hydraulic machine. The Francis-type runner includes: a runner band including at least two elements partially defining the runner band, a runner crown including at least two elements partly defining the runner crown, and a plurality of blades extending between the runner crown and the runner band. The blades are each fitted in between two elements of the runner band and between two elements of the runner crown. The method includes fabricating separately the blades, the elements of the runner band and the elements of the runner crown. All the elements of the runner band are then welded to the blades using an electron beam welding method. All the elements of the runner crown are then welded to the blades using an electron beam welding method.

Claims10

Dependent claims

A method of fabricating a Francis-type runner for a hydraulic machine;

THE Francis-type runner including
a runner band with symmetry of revolution about a central axis of the runner, the runner band including at least two elements partially defining the runner band,
a runner crown with symmetry of revolution about the central axis, the runner crown including at least two elements partly defining the runner crown, and
a plurality of blades extending between the runner crown and the runner band, the blades each being fitted in between two elements of the runner band and between two elements of the runner crown,
the method comprising:
a) fabricating separately the blades, the elements of the runner band and the elements of the runner crown, then
b) electron beam welding all the elements of the runner band to the blades, and then
c) electron beam welding all the elements of the runner crown to the blades.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/576,891Filed 19 Dec 2014
Priority: FR 14501218 Jan 2014
Published: 9 Jul 2015
Term ends: Not estimatedThe source records don’t support an estimate.

Classification13 codes

F03B 3/125
Blades; Blade-carrying rotors: rotors for radial flow at high-pressure side and axial flow at low-pressure side, e.g. for Francis-type turbines
B23K 15/0006
Electron-beam welding or cutting: specially adapted for particular articles or work
F03B 3/02
Machines or engines of reaction type; Parts or details peculiar thereto: with radial flow at high-pressure side and axial flow at low-pressure…
F05B 2230/233
By welding: electron beam welding