WATER LEVEL CONTROLLER FOR HOPPER

Japanese Patent JPH0279108

A

PURPOSE:To stabilize the water system on the upstream side of a hopper and, at the same time, to quickly cope with the fluctuation of the water level in the hopper by controlling the capacity of a pump to an intermediate capacity between the pump capacity when a low water level is detected and the one when a high water level is detected. CONSTITUTION:The flow rate of water to a hopper 1 is controlled to an aimed quantity by adjusting the opening of a flow rate control valve 6 while the flow rate is detected by means of a flow rate sensor 5. The water level in the hopper 1 is detected by means of water level detecting means 2 and 3 and, when a low water level is detected, the flowing-out quantity of the water from the hopper1 1 is decreased by lowering the capacity of a pump 9. When a high water level is detected, on the other hand, the flowing-out quantity is increased by raising the capacity of the pump 9. Thus the water level is varied between the low and high levels and, after the capacities of the pump 9 to the low and high water levels are recognized, the capacity of the pump 9 is controlled to an intermediate level. Therefore, the fluctuation of the water level can be coped with quickly and the water level can be stabilized to the intermediate level.

TAMURA TAKUHIRO
IKEUCHI YASUHIDE
MATSUO TAKAHIRO

JP23126288A

March 19, 1990

September 14, 1988

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NORITZ CORP

G05D9/00; (IPC1-7): G05D9/00

JPS4854501A	1973-07-31
JPS54132096A	1979-10-13
JPS54149903A	1979-11-24

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