Patent ID: 6135716
Filing Date: 2000-10-24
Classification: F03B,Y02E

Abstract:
A runner for a Francis-type hydraulic turbine, comprising a ring (1), a hub (2) and a number of blades (3) having a curved shape and being attached to the ring and the hub, where each blade (3) has an inlet edge (5) adapted to face towards an upstream guide apparatus in the turbine and an outlet edge (6) adapted to face towards a downstream draft tube (9) from the turbine, characterized in that the junction or attachment point (A) of the blade inlet edge (5) at the ring (1) is located forwardly of the inlet edge junction or attachment point (C) at the hub, and that the attachment point (B) of the blade outlet edge (6) at the ring (1), is located forwardly of the outlet edge attachment point (D) at the hub (2), as seen in the rotational direction (R) of the runner.