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JP3306469 |
To perform stable drain operation as intake is effected, in a vertical shaft pump performing preceding stand-by operation. In this vertical shaft pump, the impeller 1 of the vertical shaft pump is positioned in a level lower than a posit...
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JP2002138527 |
To make it a primary technical object to provide a liquid supply equipment that is drastically muffle and make it a secondary technical object to make the equipment to be compact.This equipment is equipped with a vessel 10 which houses o...
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JP2002130141 |
To provide a water feeding device capable of detecting, using a relatively simple method without use of an expensive flow switch, a shutoff operating condition wherein the amount of water is zero, and then being operated for stopping a s...
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JP2002130177 |
To provide a magnetically levitating pump capable of improving support rigidity of an impeller by making the shaft directional length of the pump compact, and additionally arranging a radial directional impeller support part using attrac...
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JP2002130180 |
To solve problems in a conventional submergible sliding bearing of a pump device using the antifreezing solution, wherein a pump does not start even if an impeller is tried to move by the motor constitution owing to the stick of a bearin...
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JP2002130147 |
To provide a controller for field installations in a water treatment facility provided with a plurality of pumps, for controlling the pumps so that one of the pumps will not be continuously operated for a long time more than needed.The c...
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JP2002122093 |
To provide a highly reliable automatic operation type submerged pump capable of surely stopping, without having to provide an electrode and a float type water level detector which may be damaged, when handling them outside the pump and d...
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JP2002097956 |
To provide an engine cooling device capable of increasing motor driving efficiency and reducing the rotation noise of a cooling fan when the rotation of the cooling fan is not required.This cooling fan 57 is connected to one end 56a of t...
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JP2002098086 |
To provide a motor pump assembly that can cope with environments different in each country.This motor pump assembly is provided with a pump P, a motor M for driving the pump P, and an electric power supply means F for supplying the motor...
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JP2002098087 |
To provide economical and multifunctional constitution reduced in the number of motors.This pump unit comprises a plurality of pump chambers 3-8 having blades 2 and stacked in multiple stages being provided on an axis of a rotating shaft...
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JP2002089482 |
To provide a vertical shaft centrifugal pump with an earth/sand discharge mechanism discharging accumulated earth and sand by forming a pocket around a ring liner in a bottom face of a casing.In this pump, the periphery of the lower end ...
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JP3288635 |
To make the terminal pressure constant and to sufficiently save the energy by outputting a speed instruction for making the terminal pressure constant on the basis of the detected output of a feed pipe to an inverter for speed- controlli...
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JP3288625 |
To continue water supply smoothly even though one of inverters fails by providing a built-in microcomputer operating and controlling a motor as well as means for input/output operating condition with another inverter. A controller 1 comp...
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JP2002070127 |
To provide a drainage pump apparatus in which a part of a ceiling of a pump suction passage is lowered, capable of quickly responding to a rise of water level in a suction water tank and draining by starting a pump to drain when water st...
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JP2002070783 |
To provide a backflow detecting system to remove foreign material from a flap valve at a discharge side by detecting the backflow from the dis charge side during shutdown period of a submersible pump.In a pump, equipped with a submersibl...
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JP2002070785 |
To improve the disadvantage of the conventional pump whose rotation al number at rated flow and declared power is set up as a maximum revolution per minute, that is incapable of full utilization of pump performance and difficult to expan...
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JP2002070782 |
To provide a vertical pump unit which can prevent the increase of water level in a suction pipe by exclusion of air in the suction pipe due to air exclusion of the pump impeller, even if there is water leakage from a flap valve which is ...
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JP3284062 |
To prevent a breakage of an impeller and a drive source due to a rotational load. An impeller 1 rotated by a drive source comprises a base 34 and blades 33 provided so as to extend outside the base 34. The base 34 has an engaging hole en...
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JP2002061568 |
To provide a fuel pump capable to various fuel systems.This independent two-stage fuel pump for a ship comprises a first pump stage having a fuel suction port and a fuel delivery port, a second pump stage having another fuel suction port...
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JP3279865 |
PURPOSE: To return water in a piping route to a supply water tank after supply of the water and thereby to prevent freezing of the water and occurrence of decomposition or an offensive smell. CONSTITUTION: An ice-making tray temperature ...
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JP3279892 |
To surely protect a pump rotational system, even when magnetic attraction force of an active thrust magnetic bearing is made controllable. In a submerged pump device for a liquefied gas tank having an active thrust magnetic bearing 61, a...
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JP2002054577 |
To provide a pump controlling method of such a structure that time and flow rate switches to make constant the pump conditions are not used whereby a high reliability pump device can be established at a low cost with a simple piping conf...
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JP2002054591 |
To provide a submersible motor pump having the convenient and, highly reliable function of automatically starting and stopping and its automatic starting and stopping method.The submersible motor pump has a temperature sensor 48 to sense...
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JP2002054598 |
To provide a land pump capable of heightening the strength, enhancing the corrosion-resistant properties and rustproof properties and reducing the cost of a suction casing and a discharge bracket, assuring good workmanship in the bolt an...
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JP2002048091 |
To provide a low-cost compact hydraulic machine capable of reducing vibration in resonance below the level of an actual damage to the hydraulic machine and operable at a rotational speed over a wide range.This hydraulic machine is provid...
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JP2002031078 |
To solve problems that the pump capacity cannot be fully achieved, the versatility of a water feed device is less easily improved, and the facility economy and the running cost are unfavorable in a conventional pump whose number of revol...
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JP2002031079 |
To solve problems that the pump capacity cannot be fully achieved, the versatility of a water feed device is less easily improved, and the facility economy and the running cost are unfavorable in a conventional pump whose number of revol...
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JP2002030719 |
To provide a water-level gage contributing to simplification and unification of circuit constitution in a control panel in the first place, and to provide the water- level gage, which can be used for not only the control panel, in which ...
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JP2002031253 |
To provide a pressure regulating valve 40 that can easily and efficiently change a pressure regulation value.First and second orifice passages 43, 44 are provided parallel between an insert-fitting hole 47 and a discharge passage 42 whic...
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JP2002021770 |
To further efficiently manufacture a control board for drainage pump equipment.In this control board having a drainage pump 1, a driving machine 2 for driving this pump and various auxiliary machines 6, 8 and 9 required for operating the...
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JP2002021767 |
To provide a submergible motor pump easily and smoothly startable without arranging expensive equipment, reducing the size and causing no damage of a motor.A motor shaft 5 driven by the motor M is formed as a hollow shaft, and a pump sha...
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JP2002021772 |
To reduce an input fluctuating speed in a starting/stopping time of pumping, reduce vibration and noises in an operation condition of a hydraulic machine in a stationary pumping operation, and improve hydraulic power efficiency in the hy...
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JP2002021773 |
To provide a centrifugal liquid pump device allowing determination of a loss of synchronization in a magnetic coupling from the outside and having a loss of synchronism detection function causing less error determination in a non-synchro...
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JP2002021771 |
To drain water suitably by arranging a plurality of submerged motor pumps in a compact water tank.A plurality of submerged motor pumps 11a, 11b are arranged vertically inside the water tank 10, and operation of these motor pumps are stop...
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JP2002017849 |
To prevent the fluctuation of the number of revolution caused by the fluctuation of power voltage in a current fixed control mode.The DC voltage of a power source is given to the inverted terminal of an operation amplifier OP1 and a moto...
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JP2002013497 |
To select a variable speed water supply system performing delivery pressure constant control and estimation terminal pressure constant control so that a motor can show its capacity 100%.A requested specification is made to be a point P1 ...
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JP2002013496 |
To conduct stable drainage operation while suctioning air in a vertical shaft pump which performs precedence standby operation.In this vertical shaft pump, the precedence standby operation is started from a position lower than a lowest w...
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JP2002005076 |
To sequentially operate a plurality of submergible pumps coupled in series in such a proper timing that bad conditions such as inability of discharge due to crush of a drainage hose, pump failure, etc., are not generated.When a plurality...
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JP2002005074 |
To provide a control unit for a self-priming pump which can attain excellent self-priming characteristics in self-priming running.A self-priming pump having a variable speed motor as a driving source comprises a rotational speed detectin...
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JP2002005075 |
To provide a pump control system which can suppress or prevent differences of discharge between respective pumps with respect to different pump-inlet water levels in an operation system of a plurality of variable speed pumps.Arithmetical...
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JP2002005095 |
To provide a suction belt-mouth for a pump which can reduce an unstable operation region, even if the pump is driven under the condition at a flow rate lower than the predetermined amount of water, a back flow phenomenon in the sucked fl...
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JP2002005077 |
To prevent a collision of an impeller with an inside wall of a pump casing when a magnetic levitation command is given.A shift circuit 62 generates a sensor output based on a shift voltage given from a shift voltage generating circuit 67...
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JP2002005073 |
To provide a method for controlling a magnetic levitation pump which can suppress variation of a rotational speed when a constant rotational speed mode is switched to a constant motor current mode.When a switching circuit SW is switched ...
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JP2001355592 |
To provide a mixed flow pump having the high specific speed, capable of realizing desired flow rate/head characteristics as well as the reduction of cost.This mixed flow pump of the high specific speed is provided with an inner casing fo...
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JP2001355577 |
To provide an energy saving promoting method for fluid machinery providing extremely easy grasp of an energy saving effect of the fluid machinery without performing a complicated simulation.In this method, an energy saving means is intro...
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JP2001342989 |
To provide a method of driving and controlling a DC pump capable of sufficiently assuring a rated flow rate in correspondence with any piping state without necessitating a flow sensor and without consuming wasteful power.This DC pump com...
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JP2001342987 |
To prevent contamination from occurring and to reduce a thrust on an impeller by bringing the rotating portions (rotor and impeller) into non- contact with a peripheral wall irrespective of normal operation or abnormal operation by idle ...
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JP2001342832 |
To adequately keep rotation speed of a water pump in a wide range of engine speed without enlarging a water pump pulley.A fluid coupling C disposed between a pump shaft 25 of a water pump 6 and the water pump pulley 13 comprises a liquid...
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JP2001336528 |
To provide a magnetic bearing device capable of being stably controlled by eliminating high-frequency noises.In the magnetic levitation device, one side of an impeller 31 is supported by an electromagnet 23 while the other side of the im...
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JP2001336493 |
To decrease digging and suction negative pressure by water jetting and simplify water piping.In a sand pump unit for earth and sand excavation 11 to suck up earth and sand at the bottom of the water from a suction port 13 by the first su...
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