Back to results
US 4,063,675 AGranted
Method of fabricating a crown plate for Francis-type hydraulic turbine runner
AssigneeAllis-Chalmers Corporation
InventorRobert G. Grubb
Life of this patent
Estimating the term…
Abstract
Method of fabricating a crown plate for a Francis-type hydraulic turbine runner. The crown is fabricated from an integrally formed inner circular portion and a pair of outer semi-circular portions welded thereto. The inner circular portion provides a rigid section of high integrity to which the runner shaft is connected.
Claims1
The method of fabricating a crown for a turbine and pump runner wherein the crown is composed of an inner circular section and at least a pair of arcuate outer sections and wherein a seal ring is connected to the crown, said method comprising the steps of:
- (1) welding the runner seal ring to the outer crown sections about the inner circular edge thereof so that a portion of the seal ring extends inwardly beyond said edge;
- (2) placing said inner circular crown section within the circle defined by said outer crown sections in abutting relation to the portion of said seal ring extending beyond said edge;
- (3) welding said inner and outer crown sections from the side of said crown remote from said seal ring whereby said seal ring is utilized as a welding backup bar;
- and (4) welding the ends of said outer sections to one another.
1 more element
Dependencies are inferred from the claim text.