Apparatus for pumping operation of a hydraulic machine having Francis type runner
AssigneeHitachi, Ltd.
InventorYuzo Yamaguchi
Life of this patent
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Abstract
An apparatus for operating a hydraulic machine having a Francis type runner provided with a multi-stage seal between the inner peripheral surface of the runner and the stationary part. The apparatus has a water extracting pipe opening at its one end to one of the seal stages of the multi-stage seal and to a draft tube at its other end. A valve disposed in the water extracting pipe is adapted to be opened when the water head has become greater than a predetermined level during the pumping operation of the hydraulic machine.
Claims5
An apparatus for pumping operation of a hydraulic machine having a Francis type runner constituted by a crown ring, a shroud ring and a plurality of blades interposed therebetween, characterized by comprising:
- a multi-stage seal including a plurality of seal stages defined between the inner peripheral surface of said shroud ring and a stationary part opposing to said inner peripheral surface of said runner;
- pressure attenuation chambers disposed between adjacent seal stages and adapted to attenuate the pressures of water having passed respective seal stages;
- a water extracting pipe opening to at least the pressure attenuation chamber second from the final and adapted to release the pressurized water from said attenuation chamber;
- and
- a valve disposed in said water extracting pipe and adapted to be opened and closed to permit and interrupt the water extraction from said attenuation chamber through said water extracting pipe.
Dependencies are inferred from the claim text.