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WO/1990/015251 |
The present invention relates to a method and apparatus for controlling the operation of a centrifugal pump. The method and apparatus in accordance with the present invention is especially developed for eliminating or minizing the proble...
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WO/1990/015252 |
A low pressure recirculation valve for cooling a centrifugal pump. A valve casing (12) having a first chamber (14) with an inlet (18) and a recirculation port (22), and a second chamber (16) with an outlet (20). A multiple piece check va...
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WO/1990/013460 |
A double-acting pump has two outlet channels (47, 48), which can be selectively charged with liquid in function of the direction of rotation, and two movable sealing membranes (36, 37) each of which is associated with an outlet channel (...
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WO/1988/007126 |
A drive assembly brake (80) is mounted in the gearbox (22) connecting a motor driven input shaft (24) to an output shaft (26), the output shaft being connected by a tubing string (10) to a submersed rotary pump. The gearbox includes an o...
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WO/1988/002831 |
Automatic recirculation valve for use in installations where a minimum flow is required for protecting such as centrifugal pumps. The valve includes a valve housing (13) with a plunger (12) controlled by a main flow and a spring (2). The...
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WO/1986/001861 |
Closed piping systems for liquids require pressure maintaining arrangements to define the level of pressure in the piping system in relation to the surrounding atmosphere. Various values of heights of delivery along the piping system are...
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WO/1985/001087 |
In a float switch, which is provided particularly for immersion pump systems with an electric motor connectable and disconnectable as a function of the level and with a pump coupled thereto and immersed into the liquid to be discharged a...
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WO/1983/004286 |
The method is applied to a turbomachine, particularly to a pump, and to a support for a pressure sensor of a gaseous or liquid fluid, particularly an electronic pressure pick-off. The pressure or differential pressure of the fluid (3) co...
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WO/1983/003461 |
A device allows to reduce the power used by the motor of a circulation pump actuated by an electric motor for heating installations. The reduction is obtained by interrupting periodically the network power supply by means of an electroni...
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JP2013019420 |
To calculate shaft power and consumption power required when a pump is operated at an optional operating point based on a pump characteristic value indicating the optional operating point.A reference flow rate calculation part 16A calcul...
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JP2013019421 |
To calculate a characteristic value of a pump with high accuracy without measuring operation characteristic data of the pump in advance.A device for calculating a pump characteristic value includes: a reference operating point identifyin...
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JP2013019422 |
To calculate a characteristic value of a pump with high accuracy without measuring operation characteristic data of the pump in advance.A device for calculating a pump characteristic value includes: a reference operating point identifyin...
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JP2013011241 |
To provide a multistage pump with improved tansporting performance.The multistage pump includes a rotating shaft 1, a plurality of impellers 2 fixed at the rotating shaft 1, and a pump casing 3 that accommodates the plurality of impeller...
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JP2013011254 |
To solve the problem that water inside a pump powered by an internal combustion engine and inside a pipe on the pump side remain in situ until the pump powered by the internal combustion engine is operated and that there is the risk of r...
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JP2012246865 |
To provide a pump facility of high maintainability, by managing and maintaining the pump facility from a present operation state.This pump facility 10 includes: a main pump 301 for pumping liquid; an auxiliary machine facility 303 includ...
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JP2012246826 |
To provide water supply equipment that enables easy detection of failure in a backflow prevention valve, includes a plurality of sets of water supply devices each comprising a backflow prevention valve, a pump, etc., and is configured by...
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JP2012241614 |
To provide a water supply device using a variable speed pump suitable for a terminal pressure constant control system without the need for concerning about an overload or overcurrent, and not requiring any special preliminary considerati...
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JP2012241567 |
To issue a warning of a pump failure due to cavitation or leakage of a pump device which sucks a fluid from a suction port and discharges the fluid from a discharge port without storing the fluid in a pressure tank.The pump device includ...
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JP2012229699 |
To provide a method for starting a water supply system that can eliminate a lack of water supply pressure caused in such a case as when flush valves for flushing toilets in facilities such as a school are used simultaneously.The water su...
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JP2012225255 |
To provide a water supply system capable of continuing the water supply without suspending the operations of pumps even if transmission faults take place between a plurality of inverter control sections and a control section that issue s...
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JP2012219764 |
To improve the reliability of a water supply device by stopping a pump even when the pressure on the discharge side of the pump is not increased due to clogging of a constant pressure valve with a foreign matter or the like.The water sup...
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JP2012219721 |
To provide a fluid flowing device inhibiting the deterioration of pump efficiency and inhibiting the occurrence of a pump lock state by magnetic foreign matters.To solve the problem, in the fluid flowing device including a pump 2 for cau...
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JP2012216133 |
To provide a liquid level control device and a liquid level control method capable of performing liquid level control with higher accuracy and reducing a useless adjustment.A liquid level control device 1 comprises: a container 20 where ...
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JP2012215176 |
To eliminate the work for causing start timing of one submersible pump 1A to be different from that of another submersible pump 1B and to reliably perform automatic alternate operations of the two submersible pumps 1, when installing the...
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JP2012215101 |
To improve pump efficiency by reducing unnecessary energy with a simple structure and a simple control.The pump includes a rotary drive shaft 5 provided inside a pump casing 3 having a fluid suction opening on one end side and a fluid ej...
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JP2012207546 |
To provide a pump power consumption characteristic model in consideration of non-linearity and multi-valued feature of power consumption characteristics with respect to a flow rate, and a change of the power consumption characteristic ac...
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JP2012197795 |
To provide a horizontal shaft pump (a double-suction horizontal shaft pump or self-balance multistage horizontal shaft pump) which has vane wheels disposed symmetrically, makes a radial load borne by a hydrostatic bearing, and effectivel...
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JP2012193585 |
To provide a water distribution pressure control apparatus which is capable of highly accurately controlling terminal pressure of a water distribution pipe network.A water distribution pressure control system includes a duct resistance m...
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JP2012188943 |
To provide a water supply device that can detect an abnormal state of a CPU.The water supply device includes: pumps 3-1, 3-2 for supplying water; a pressure detector 8 for detecting water pressure at a discharge side of the pump to outpu...
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JP2012177304 |
To provide a configuration, by which semiconductor components inside a controller are cooled by air and the controller is manufactured at low cost.The controller 3 is arranged in the rear of a cylindrical fan cover 29 which covers a moto...
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JP2012172565 |
To improve pump efficiency by lengthening effective lengths of blades of an impeller, and attract a bearing by magnetic attractive force to prevent reflux from suction to discharge.In a pump 110, a liquid sucking direction X and a liquid...
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JP2012154186 |
To provide a bypass energy recovery device of a fluid machine that can improve the total efficiency of the machine by effectively utilizing a pressure-loss amount of fluid energy in a pressure-loss mechanism.In a multistage centrifugal p...
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JP2012154286 |
To provide a water supply device capable of easily setting a parameter required for performing end pressure constant control.A target pressure setting means of the water supply device operates an electric motor at a variable speed by a v...
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JP2012149529 |
To provide a drainage pump for an air conditioner, achieving a smaller occupied space in the air conditioner by eliminating the need to externally mount a sensor, etc. for detecting a drainage water level.A motor part 10 is supported by ...
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JP2012149649 |
To improve stall-resistant characteristics of a pump to be used, to provide the pump with characteristics more resistant to stall, and to combine constant shaft power with rotation speed to enable stable operation over a wider operation ...
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JP2012144976 |
To provide an abnormality detection method of a pressure tank which can accurately detect the abnormality of the pressure tank such as decrease in the charged pressure, and a water supply device with an abnormality detection function for...
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JP2012127360 |
To provide a pump installation having improved reliability, safety and economic efficiency by shortening the time for stating a horizontal shaft pump to allow quick start of draining operation.The pump installation 1 including the horizo...
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JP2012117371 |
To provide a pump device that can detect the rotational direction of a pump without depending on visual confirmation, and can rotate the pump in a positive direction.The pump device comprises the pump P, a motor M, an inverter 12, and a ...
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JP2012112363 |
To provide a water supply device capable of stabilizing a water supply pressure when renewing a target pressure of terminal pressure constant control (or discharge pressure constant control).In the water supply device including a pump co...
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JP2012101136 |
To provide a fire pump system which can steadily and effectively work under unfavorable conditions when a disaster occurs.The fire pump system includes a motor-driven pump 10 for feeding water, a plurality of discharging means 50 mounted...
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JP2012087688 |
To provide a pump control device, which is capable of reducing a variation rate of an actual flow rate with respect to a target flow rate of a pump device during a low flow rate, while a control of the pump device is simplified.A pump co...
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JP2012082688 |
To achieve a high pumping efficiency in a wide flow rate range.A drive control device of an electric pump includes a pump for supplying a dynamic pressure to a fluid by rotating an impeller, and a motor serving as a rotation drive source...
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JP2012077684 |
To provide a highly reliable pump apparatus having a simple apparatus constitution and capable of reliably executing the start and the continuous operation of a pump without stopping a prime mover to a large fluctuation of the water suct...
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JP2012077701 |
To automatically measure pump characteristics without stopping operation of a water treatment plant facility.A control device 10 monitors whether a pumping amount q and an average rotation speed n of suction pumps P1-PN are within prescr...
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JP2012072697 |
To provide a centrifugal pump unit capable of generating sufficient negative pressure in a case.In this centrifugal pump unit 10, a delivery nozzle 45 is arranged in an upper part 38 of the case 33, an impeller 23 is rotatably arranged i...
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JP2012052440 |
To achieve prevention or mitigation of a surging phenomenon of a suction water tank and reduction of a load of power supply equipment, while equalizing a discharge operation time of each pump, without increasing the scale of a pump stati...
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JP2012026376 |
To provide an overheating protection system of a pump that has a thin pipe diameter and a short bypass pipe, and that prevents a temperature of liquid from increasing at low cost and effectively.The overheating protection system 20 of th...
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JP2012002231 |
To provide a system and method of determining a centrifugal turbomachinery remaining life.A centrifugal turbomachine 10 includes an impeller 16 and a speed sensor 22 arranged to detect a speed associated with an impeller speed. The speed...
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JP2012002197 |
To provide an automatic operation device of a non-automatic operation type electric pump capable of immediately responding to a liquid level, by an automatic operation device of a non-automatic operation type electric pump which eliminat...
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JP2011256769 |
To provide horizontal shaft pump equipment capable of suppressing starting current of an electric motor serving as a driving machine, completing a water filling process in a short time, and allowing a draining operation at an early stage...
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