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| Number | Title | Issue Date |
| 6846154 | Pump turbine In a pump turbine which can be operated in a pumping mode or a generating mode by switching the rotating direction of a runner, the discharge passing through the runner is adjusted based on a wicket gate opening; the speed of the runner is sensed; a target speed is ... | 01/25/2005 |
| 6568900 | Pressure swing contactor for the treatment of a liquid with a gas A residential method for treating water with an oxidizing gas operates under elevated pressure. The elevated pressure is obtained by means of a pressurized oxidizing gas source (eg. an air pump) or a Prandtl layer turbine. The elevated pressure of the tre... | 05/27/2003 |
| 6210100 | Pump-turbine An upper reservoir-side conduit or a lower reservoir-side conduit is branched in the vicinity of pump-turbine ends and at least a first pump-turbine out of a plurality of pump-turbines which share the conduit portions located farther than the branch point... | 04/03/2001 |
| 6042331 | Pump-turbine An upper reservoir-side conduit or a lower reservoir-side conduit is branched in the vicinity of pump-turbine ends and at least a first pump-turbine out of a plurality of pump-turbines which share the conduit portions located farther than the branch point... | 03/28/2000 |
| 5533668 | Remotely activated opposing/aiding air flow control register A bi-directional airflow controllable system for controlling flow of air through an air circulating system to at least one zone an air temperature of which is to be controlled is coupled to an airflow duct to aid or oppose airflow throughout the duct and ... | 07/09/1996 |
| 5413278 | Remotely activated opposing pressure air flow control register The invention is directed to a method and apparatus for controlling airflow in a given direction in an air circulating system in which the method comprises the steps of: (a) placing a motor driven fan in the air circulating system in such a manner that th... | 05/09/1995 |
| 5090867 | Rotating fluid machine for reversible operation from turbine to pump and vice-versa A rotating fluid machine for reversible operation from turbine to pump and from pump to turbine having a simple structure which allows for easy manipulation when reversing operation, and having a low change in efficiency when the machine operates in rever... | 02/25/1992 |
| 4986382 | Power assistance for vehicle steering mechanisms In a power assistance system for a vehicle steering mechanism fluid pressure providing the assistance is supplied from a pump driven intermittently by an infinitely-variable electric motor. For a rack and pinion mechanism fluid pressure chambers are forme... | 01/22/1991 |
| 4898512 | Apparatus and method for reducing effects of draft tube pressure fluctuations Apparatus and method for reducing the effects of draft tube pressure fluctuations acting on a runner in a hydraulic reaction turbine or the effects of suction tube pre-rotation acting on the impeller in a centrifugal pump. A closed surge suppression chamb... | 02/06/1990 |
| 4756663 | Method for operating pumps A method for operating pumps in a pumping-up power plant having a single speed reversible pump-turbine and a booster pump, the booster pump being provided in a branch pipe which is provided in parallel with a portion of a draft tunnel between the pump-tur... | 07/12/1988 |
| 4720240 | Cover for turbines and pumps A cover for turbines or pumps, which is substantially less expensive than a cover having a cast construction. The cover is made of welded metal plates in a shape which generally corresponds to that of Kaplan type turbines, pumps or the like, and includes ... | 01/19/1988 |
| 4715781 | Cover for turbines and pumps A cover for turbines or pumps which is substantially less expensive than a cover having a cast construction. The cover is made of welded metal plates in a shape which generally corresponds to that of Kaplan type turbines, pumps or the like, and includes a... | 12/29/1987 |
| 4708590 | Cover for turbines and pumps A cover for turbines or pumps, which is substantially less expensive than a cover having a cast construction. The cover is made of welded metal plates in a shape which generally corresponds to that of Kaplan type turbines, pumps or the like, and includes ... | 11/24/1987 |
| 4692090 | Multistage hydraulic machine A multistage hydraulic machine includes a water chamber in a bottom ring of the highest-pressure stage. The water chamber supplies cooling water to seal gaps between rotary and stationary elements through a communication passage connected to the water cha... | 09/08/1987 |
| 4655679 | Power translation device An apparatus for translating motive energy includes a rotor structure, having mutually spaced rotor members, adapted to react with fluids within the housing. In one embodiment, the rotor structure is rotationally driven by an external power plant for pump... | 04/07/1987 |
| 4640664 | Methods of controlling operation of multistage hydraulic machines 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 a... | 02/03/1987 |
| 4629393 | Method of operating multistage hydraulic machinery In a water level depressing operation of a multistage hydraulic machine, first, the guide vane in the maximum-pressure stage is totally closed. Then, the respective guide vanes in the remaining stages are left opened more or less, and compressed air is su... | 12/16/1986 |
| 4624622 | Fail-safe system for a reversible pump-turbine apparatus A fail-safe system is used in a control unit for opening and closing guide vanes of a pump-turbine apparatus operable in both of pump operation mode and turbine operation mode. The fail-safe system has a wire carried by a rotatable sheave adapted for tran... | 11/25/1986 |
| 4589821 | High-head multistage pump-turbine A hydrostatic bearing supplied with pressurized water positioned as a seal between the shaft of a pump-turbine and a suction bend adjacent the lower end of the shaft. The hydrostatic bearing replaces the conventional labyrinth joint usually located above ... | 05/20/1986 |
| 4588352 | Multistage hydraulic machine A multistage hydraulic machine including a main shaft, a main shaft sealing device, and plural runners mounted on the main shaft and containing water at different pressure levels. A top cover is mounted on the highest pressure stage runner and in the spac... | 05/13/1986 |
| 4578017 | Method for stopping a multi-stage hydraulic machine A method for stopping a multi-stage hydraulic machine with an inlet valve, guide vanes including highest and lowest stage guide vanes, and a return passage connected between flow passages of respective stages, wherein the machine is in turbine operation, ... | 03/25/1986 |
| 4568240 | Method and apparatus for controlling multistage hydraulic machine A method and apparatus for controlling a multistage hydraulic machine in which respective pressure stages are connected in series through runners and return passages and the highest and lowest pressure stages are provided with movable guide vanes, are org... | 02/04/1986 |
| 4547123 | Multi-stage hydraulic machine and method of operating same A multi-stage hydraulic machine which includes a plurality of runner housings or chambers each having a runner positioned therein, a head cover and an intermediate speed ring, movable guide vanes at an outside portion of the runner housing or chamber of t... | 10/15/1985 |
| 4538957 | Multi-stage hydraulic machine and control method for multi-stage hydraulic machine 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 connect... | 09/03/1985 |
| 4537558 | Multi-stage hydraulic machine and control method for a multi-stage hydraulic machine 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 conn... | 08/27/1985 |
| 4502835 | Multistage hydraulic machine A multistage hydraulic machine which includes a housing, a main shaft mounted in the housing, a high-pressure stage and low-pressure stage runner firmly secured to the main shaft wherein the housing has formed therein a plurality of runner chambers enclos... | 03/05/1985 |
| 4502831 | Method of controlling operation of multistage hydraulic machines 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... | 03/05/1985 |
| 4496282 | Reversible two-stage hydraulic machine A reversible two-stage hydraulic machine, or pump/turbine, is disclosed having a rotary shaft. A first-stage Francis-type runner is fixed to the shaft with a spiral casing surrounding the first stage runner for distributing water to the runner from an upp... | 01/29/1985 |
| 4487549 | Apparatus for controlling operation of hydraulic machine An apparatus for controlling the operation of a hydraulic machine such as a multi-stage pump turbine having a plurality of runners mounted on a common shaft and guide vanes arranged around respective runners to adjust the flow rate of water supplied to re... | 12/11/1984 |
| 4475865 | Apparatus for controlling the operation of a water turbine or a pump turbine and a method thereof An increment speed per unit time from the detected rotation speed of a water turbine or a pump turbine with an inlet valve is compared with a prescribed increment to deliver a close order to the inlet valve, when the increment becomes greater than the pre... | 10/09/1984 |
| 4474528 | Water wheel operation control method and apparatus therefor Methods of controlling operation of power generating water wheels and apparatus therefor are disclosed. When a guide vane will not close upon occurence of a state of emergency, the inlet valve is kept open until the flow to the wheel starts to suddenly de... | 10/02/1984 |
| 4472105 | Rotary type pumping machine A rotary type pumping machine such as a pump turbine in a pumped storage hydro-electric plant, wherein, when the pumping operation of the runner of the machine is started, compressed air is introduced into the runner chamber to depress the water surface i... | 09/18/1984 |
| 4472104 | Operation control method for multistage regulated hydraulic machine An operation control method for a multistage regulated hydraulic machine wherein channels of the stages from the lower pressure side to the higher pressure side are successively communicated with each other through return guides and at least two said stag... | 09/18/1984 |
| 4472103 | Multistage hydraulic machines and methods of controlling operations thereof A multistage hydraulic machine such as a pump/turbine having at least three pressure stages in which the highest and lowest pressure stages are provided with movable guide vanes the degree of opening of which are variable, and the other intermediate press... | 09/18/1984 |
| 4468167 | Method of operating water-turbine or pump water-turbine A method of operating a water-turbine or a pump water turbine in which, when the runner is idling for phase modification running or stand-by running, the main machine is tripped by means of a main machine tripping circuit when the flow rate of cooling wat... | 08/28/1984 |
| 4464579 | Derrieus wind turbine electric generating system A wind electric system intended to provide power to a power grid, for use with a wind turbine which has no starting torque. The generator is one which can function as a motor as well. When the wind is too light to permit generation, an overriding clutch m... | 08/07/1984 |
| 4447739 | Rotor withdrawal arrangement for bulb generators Apparatus for withdrawing the rotor from the stator in a bulb-type generator makes the rotor and the inner portion of the stator accessible for repair or maintenance without having to disassemble the housing and stator. A pair of detachable beams are plac... | 05/08/1984 |
| 4431370 | Multistage hydraulic machines having air exhausting devices 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 runne... | 02/14/1984 |
| 4430574 | Method for switching operation of water wheel or pump water wheel A method for switching the mode of operation of a water wheel or a pump water wheel is disclosed. Water in a runner chamber of the water wheel or the pump water wheel is pushed down below a runner by supplying compressed air to cause a runner to race. Whe... | 02/07/1984 |
| 4412779 | Control method for multi-stage hydraulic machine 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 f... | 11/01/1983 |
