Pumps – Condition responsive control of pump drive motor – Responsive to accumulation of pumped liquid in receiver
Reexamination Certificate
2011-01-25
2011-01-25
Kramer, Devon C (Department: 3746)
Pumps
Condition responsive control of pump drive motor
Responsive to accumulation of pumped liquid in receiver
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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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.
Enomoto Takashi
Kamata Isamu
Kanno Hideki
Kuramasu Masahiro
Suzuki Shinji
Ebara Corporation
Hamo Patrick
Kramer Devon C
Westerman Hattori Daniels & Adrian LLP
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