Hydraulic turbine and exit stay apparatus therefor

Details Hydraulic turbine and exit stay apparatus therefor Hydraulic turbine and exit stay apparatus therefor

2005-07-19

2005-07-19

Look, Edward K. (Department: 3745)

Rotary kinetic fluid motors or pumps

Selectively adjustable vane or working fluid control means

Upstream of runner

C415S211200, C415S914000

Reexamination Certificate

active

06918744

ABSTRACT:
The invention is an Exit Stay Apparatus for Francis and propeller hydraulic turbines. The purpose of the invention is to eliminate the loss of turbine efficiency and strong pulsations in draft tube caused by the axial circular vortex in all turbine operating regimes other than optimum without a noticeable decrease in maximum efficiency. It can be incorporated not only into newly fabricated hydraulic turbines, but also retrofitted into existing turbines. The Exit Stay Apparatus has a crown and exit stay vanes secured to the the crown. When installed in the turbine, the exit stay crown is located immediately after the runner crown, which is truncated at the bottom by a plane perpendicular to the central axis of the turbine. The exit stay crown together with the truncated runner crown forms water passages after the runner blade crown profile exit. The exit stay vanes are arranged in a circular array around the turbine axis, located after the runner blades, and attached at the periphery either to the draft tube cone or to an exit stay flange secured to the turbine discharge ring and to the draft tube cone.

REFERENCES:
patent: 1748768 (1930-02-01), Reinhard
patent: 5261787 (1993-11-01), Morgunov
patent: 5871331 (1999-02-01), Itabashi et al.
patent: 52066128 (1977-06-01), None

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