Split francis turbine runner

Details Split francis turbine runner Split francis turbine runner

2006-07-13

2008-12-30

Look, Edward (Department: 3745)

Fluid reaction surfaces (i.e., impellers)

Rotor having flow confining or deflecting web, shroud or...

Radially extending web or end plate

C416S208000

Reexamination Certificate

active

07470112

ABSTRACT:
A split runner for a Francis turbine has runner segments that are adapted to be joined together along confronting surface portions thereof to form a composite runner having a crown, a band and a plurality of blades extending between the crown and the band. The confronting surface portions of the runner segments are located only along portions of the crown and portions of the band, and the confronting surface portions of the runner segments are located in between and spaced from adjacent blades of the composite runner. Since the confronting surface portions are located only along portions of the crown and portions of the band, none of the blades are split eliminating the need to weld together blades during formation of the composite runner. Accordingly, the composite runner does not have weld joints formed in the blades which are highly stressed operating parts of the runner.

REFERENCES:
patent: 3973876 (1976-08-01), Eyster et al.
patent: 55123374 (1980-09-01), None

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