Tokyo Shibaura Denki Kabushiki Kaisha

Shinsaku Sato

Ichiro Yamagata

Sachio Tsunoda

A multistage hydraulic machine in which respective pressure stages are connected in series through return passages and the highest and lowest pressure stages of the hydraulic machine are provided with movable guide vanes the degrees of openings of which are variable is controlled for load regulation or water flow rate regulation under a normal operation condition of the hydraulic machine by controlling degrees of openings of the movable guide vanes of the highest and lowest pressure stages in accordance with several control modes.

Methods of controlling operation of multistage hydraulic machines

A multi-stage hydraulic machine includes a rotatable shaft, a plurality of runners fixed to the shaft and arranged from a highest-pressure stage to a lowest-pressure stage, runner chambers which respectively house the runners, a return channel for connecting adjacent ones of the runner chambers with each other, movable wicket gates provided at least in the runner chamber of the highest-pressure stage and capable of moving between a position in which the movable wicket gates block the channel and a position in which said movable wicket gates open the channel, and a draft tube connected to the runner chamber of the lowest-pressure stage. For controlling the machine, there are included means for feeding compressed air into the runner chamber of the highest-pressure stage, a plurality of communicating pipes, including valves connected with the runner chamber of each of the stages, a water feeding pipe having a valve, communicated between the return channel adjacent to the runner chamber of the lowest-pressure stage and the draft tube, a plurality of pressure detecting means arranged at the runner chamber of each of the stages, respectively, and means for controlling the valves of the communicating pipes and water feeding pipe in response to the output of the pressure detecting means.

Multi-stage hydraulic machine and control method for multi-stage

A multi-stage hydraulic machine comprises a rotatable shaft, a plurality of runners fixed to the shaft and arranged from a highest-pressure stage to a lowest-pressure stage, runner chambers which, respectively, house the runners, a return channel for connecting adjacent ones of the runner chambers with each other, movable wicket gates provided at least in the highest-pressure stage and capable of moving between a position in which the movable wicket gates block the channel and a position in which the movable wicket gates open the channel, a casing connected to the highest-pressure stage, and an inlet valve disposed between the casing and a penstock.

Multi-stage hydraulic machine and control method for a multi-stage

A multistage hydraulic machine in which respective pressure stages are connected in series through return passages and the highest and lowest pressure stages are provided with movable guide vanes the degrees of openings of which are variable is controlled in load adjustment or in response to the change of a static head under a steady operation condition by controlling the degrees of openings of the movable guide vanes of the highest and lowest pressure stages in accordance with several modes.

Method of controlling operation of multistage hydraulic machines

A multi-stage hydraulic machine comprises a rotatable shaft; a plurality of runners fixed to the shaft and arranged from a highest-pressure stage to a lowest-pressure stage; runner chambers in which are respectively housing the runners; a return channel for connecting adjacent ones of said runner chambers with each other; movable wicket gates provided at least in the highest-pressure stage and capable of moving between a position in which the movable wicket gates block the channel and a position in which the movable wicket gates open the channel; and a casing connected to the highest-pressure stage. In a control method for the hydraulic machine, the wicket gates are closed and highly pressurized water is fed through a feed pipe in an outer circumferential portion of the runner chamber of the highest-pressure stage defined inside of the movable wicket gates, said water sequentially reaching the lower pressure stages through the return channels. The air at the central portion of each of the stages is then exhausted in a sequential manner from the highest-pressure stage to the lowest-pressure stage.

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Ebina, Japan

Shinsaku Sato