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Patent Searching and Data


Title:
OPERATION CONTROLLING METHOD FOR DRAIN PUMP
Document Type and Number:
Japanese Patent JP3614664
Kind Code:
B
Abstract:

PROBLEM TO BE SOLVED: To always drive and control an appropriate number of pumps by detecting a water level rising speed and a water level rising acceleration of a pump well pit while a plurality of pumps are installed at the same level.
SOLUTION: A water level rising speed and a water level rising acceleration of a pump pit are detected (S10), an inflow quantity is calculated from the water level rising speed detected and an area of the pump well pit and an inflow variation quantity is calculated (S11). Next, the number of the operating pumps is determined based on these calculated values (S12). Then, a presumed water level rising speed at the time of activating the pumps is calculated from the number of the operating pumps (S13). Subsequently, a pump starting beginning water level is determined from the calculated value, the number of the operating pumps and a first water lifting starting level (S14). Then, when a water level is raised to a pump starting beginning water level of which a water level of the pump well pit is determined, the determined number of pumps are started (S15, 16).


Inventors:
Umezawa, Sohei
Yumoto, Manabu
Kawakatsu, Hiroyuki
Application Number:
JP1998000174594
Publication Date:
November 12, 2004
Filing Date:
June 22, 1998
Export Citation:
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Assignee:
KUBOTA CORP
International Classes:
F04D15/00; F04B49/06; F04D13/00; (IPC1-7): F04D15/00; F04B49/06; F04D13/00