1
Sachio Tsunoda, Shinsaku Sato: Multi-stage hydraulic machine and control method for a multi-stage hydraulic machine. Tokyo Shibaura Denki Kabushiki Kaisha, Oblon Fisher Spivak McClelland & Maier, August 27, 1985: US04537558 (19 worldwide citation)

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 w ...


2
Sachio Tsunoda: Pumping-up hydroelectric power plants. Tokyo Shibaura Denki Kabushiki Kaisha, Stevens Davis Miller & Mosher, October 11, 1983: US04408452 (10 worldwide citation)

In a pumping-up hydroelectric power plant comprising a single speed main pump/turbine and a booster pump operable in series in a pumping operation between an upper reservoir and a lower reservoir, a water head shared by said booster pump is varied depending on a variation in the static head between ...


3
Sachio Tsunoda, Kiyoshi Harada: Casings of hydraulic machines. Tokyo Shibaura Denki Kabushiki Kaisha, Stevens Davis Miller & Mosher, August 19, 1980: US04218182 (8 worldwide citation)

In a casing of a hydraulic machine of the type comprising a stay ring including a pair of opposing annular plates and a plurality of stay vanes fixed therebetween to form stay vane flow passages between the stay vanes, and a spiral case disposed on the radially outside of the stay ring, the stay van ...


4
Kentaro Ichikawa, Ichiro Yamagata, Sachio Tsunoda: Multistage hydraulic machines having air exhausting devices. Tokyo Shibaura Denki Kabushiki Kaisha, Stevens Davis Miller & Mosher, February 14, 1984: US04431370 (7 worldwide citation)

In a multistage hydraulic machine of the type having a main shaft supporting a plurality of runners ranging from a highest pressure stage to a lowest pressure stage, at least one set of adjustable wicket gates provided for the highest pressure stage runner, a draft tube connected to a lower end of t ...


5
Sachio Tsunoda, Kaneo Sugishita: Method of controlling operation of Francis type pump turbines. Tokyo Shibaura Denki Kabushiki Kaisha, Stevens Davis Miller & Mosher, August 24, 1982: US04346304 (7 worldwide citation)

In a Francis type pump turbine, for the purpose of switching the operation of a synchronous dynamoelectric machine from synchronous condenser operation wherein compressed air is admitted into a runner chamber to force down water level therein so as to cause a runner to rotate in air, to a synchronou ...


6
Sachio Tsunoda, Ichiro Yamagata: Multistage hydraulic machine system and a method for controlling the operation thereof. Tokyo Shibaura Denki Kabushiki Kaisha, Oblon Fisher Spivak McClelland & Maier, July 28, 1981: US04280788 (6 worldwide citation)

Disclosed is a multistage hydraulic machine system which comprises a multistage hydraulic pump/pump-turbine including a highest-pressure stage having movable guide vanes with variable opening of water path arranged round a runner and a lower-pressure stage or stages having fixed guide vanes with fix ...


7
Sachio Tsunoda, Shinsaku Sato: Control method for multi-stage hydraulic machine. Tokyo Shibaura Denki Kabushiki Kaisha, Oblon Fisher Spivak McClelland & Maier, November 1, 1983: US04412779 (5 worldwide citation)

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 ch ...


8
Sachio Tsunoda: Method of pumping up electric power generation and an apparatus therefor. Tokyo Shibaura Denki Kabushiki Kaisha, Oblon Fisher Spivak McClelland & Maier, March 2, 1982: US04318004 (5 worldwide citation)

Disclosed are a method of pumping up electric power generation and an apparatus therefor which comprises a single-speed reversible pump-turbine and a booster pump, hydraulically coupling and driving the pump-turbine in series with the booster pump to perform pumping with the sum of respective pump t ...


9
Sachio Tsunoda, Masaharu Nonaka: Method of controlling operation of multistage hydraulic machines. Tokyo Shibaura Denki Kabushiki Kaisha, Stevens Davis Miller & Mosher, March 10, 1981: US04255078 (3 worldwide citation)

In a method of controlling guide vanes of a multistage hydraulic machine including a plurality of stages interconnected by return passages of the type wherein under an abnormal condition which occurs when the operation of a water wheel or a pump is stopped or when the load of the water wheel is inte ...


10
Sachio Tsunoda, Hiroshi Tanaka, Ichiro Yamagata, Shigeto Fujiki, Yoshikazu Kobayashi, Akira Terasaki: High head pump-turbines. Kabushiki Kaisha Toshiba, Foley & Lardner, March 1, 1994: US05290148 (2 worldwide citation)

When the trigonometric function of the phase lag of the hydraulic excitation of the runner vanes, which varies in accordance with the combination of the number of runner vanes and the number of guide vanes of a high head pump/turbine, is denoted by cos(.theta..sub.R n), the thickness of the crown al ...



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