Runner for Francis-type hydraulic turbine
AssigneeGE Energy (Norway) AS
InventorsJan Tore Billdal, Olav Rommetveit, Hermod Brekke
Life of this patent
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Abstract
Disclosed is a runner for a Francis-type hydraulic turbine, comprising a ring, a hub, and a number of blades all having a curved shape and being attached to the ring and hub. Each blade has an inlet edge and an outlet edge. The blades are characterized in that, in the direction of turbine rotation, the junction point of each blade inlet edge at the ring is located forwardly of the inlet edge attachment point for that blade at the hub, and the junction point of each blade outlet edge at the hub is located forwardly of the outlet edge attachment point for that blade at the ring.
Claims4
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.
Dependencies are inferred from the claim text.