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Title:
METHOD OF OPERATING HORIZONTAL SHAFT PUMP
Document Type and Number:
Japanese Patent JPH04148098
Kind Code:
A
Abstract:

PURPOSE: To prevent the timing of start of water pump-up operation from being delayed, by standby-operating a pump driving prime-mover in a clutch turn-off condition until the water level of a pump-up water well comes to a water pump-up start level, and by fulling water in a pump through the operation of a water level raising means.

CONSTITUTION: A pump driving prime-mover 14 is started and is standby-operated in a clutch 13 turn-off condition until the water level of a pump-up water well 1 comes to a water pump-up start level HWL from a lowest level LWL, and a vacuum pump 20 in a water level raising means 11 is started so that the prime-mover 14 performs a full speed standby operation in such a condition that the water level is raised up to a full water level HWL1 within the pump. Further, when the water level of the pump-up water level comes to the water pump-up start level, the clutch 13 is turned on so that a pump main shaft 12 and an impeller 3 are rotated so as to start discharging. With this arrangement, even in an emergency operation in which a large volume of water abruptly flows into the pump-up water well 1, it is possible to prevent the timing of start of water pump-up operation, thereby it is possible to prevent occurrence of a flood caused by abnormal rise of the water level of the pump-up water well 1.


Inventors:
TAMURA IKUJI
SUZUKI NOBUHIRO
YONEMURA SHOICHI
FURUKAWA HIROHIKO
KONISHI MASAHIDE
Application Number:
JP27493590A
Publication Date:
May 21, 1992
Filing Date:
October 11, 1990
Export Citation:
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Assignee:
KUBOTA KK
International Classes:
F04D15/00; (IPC1-7): F04D15/00
Domestic Patent References:
JPH0279101A1990-03-19
JPS5028642A1975-03-24
JP63121797B
Attorney, Agent or Firm:
Koichi Suzue (1 person outside)



 
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