Patent ID: 6918744

Claim:
A reaction hydraulic turbine having a guide gate apparatus, a shaft, a runner apparatus secured to said shaft, an exit stay apparatus, and a draft tube with a draft tube cone; said guide gate apparatus having a plurality of wicket gates arranged in a circular array around a central axis with said gates pivotal about pivot axes parallel to said central axis; said runner apparatus having a plurality of runner blades arranged in a circular array around said central axis and a runner crown with said runner blades secured to said runner crown; and said exit stay apparatus having an exit stay crown located immediately under said runner crown, which said exit stay crown together with said runner crown forms water passages at said runner apparatus exit, and said exit stay apparatus further having a plurality of exit stay vanes arranged in a circular array around said central axis with said exit stay vanes secured to said exit stay crown; said exit stay vanes crossing water passages from said exit stay crown to the periphery, so that the entire flow of the water through said reaction hydraulic turbine must pass through the channels formed by said exit stay vanes; said exit stay vanes are secured at the periphery and, therefore, said exit stay crown is supported by said exit stay vanes below said runner crown; said exit stay crown does not touch other parts of said reaction hydraulic turbine besides said exit stay vanes; and said draft tube cone forming water passages having no solid bodies inside so that the water flow in said draft tube cone after said exit stay apparatus touches no solid surfaces besides said draft tube cone.