Water-lifting pump apparatus and method for controlling...

Pumps – Condition responsive control of pump drive motor – Responsive to accumulation of pumped liquid in receiver

Reexamination Certificate

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Details

C417S036000, C417S043000, C417S044200

Reexamination Certificate

active

07874809

ABSTRACT:
A water-lifting pump apparatus which is free of a discharge valve and a check valve, is low in cost, and is capable of reducing vibration and noise due to a waterfall after the end of water pumping operation. The water-lifting pump apparatus has a suction tank (10), a discharge tank (20), a pump (30) for pumping water in the suction tank (10) into the discharge tank (20), and a discharge piping (50) connected to a discharge side of the pump, an actuator (60) for actuating the pump (50), a reverse flow preventing mechanism (80) for preventing a reverse flow of water pumped into the discharge tank (20) toward the discharge piping (50), and a back flow rate control (90) for controlling the flow rate of a waterfall falling from the discharge piping (50) into the suction tank (10) when pumping operation is finished.

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patent: 2000-345991 (2000-12-01), None
International Search Report of PCT/JP2004/014740 dated Feb. 23, 2005.
Translation of the International Preliminary Report on Patentability of International Application No. PCT/JP 2004/014740, with Form PCT/IPBA/409.

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