| 摘要 |
<P>PROBLEM TO BE SOLVED: To attain a stepwise start of draining of a plurality of vertical shaft pumps even when water flows rapidly into a water absorption tank, to make draining operation time for each vertical shaft pump uniform, and to unify the specification of each vertical shaft pump in a pump facility provided with a plurality of the vertical shaft pumps provided in the water absorption tank. Ž<P>SOLUTION: In each vertical shaft pump 11, switching can be performed between: forcible operation in air in which a discharge valve 37 is closed, communication between a discharge port and a discharge pipe 23 is cutoff, a control valve 37 is opened, and a main shaft 25 is rotated by a driving mechanism 28 in a state of compressed air from a compressed air supply source filled in a casing 22; and normal operation in which the discharge valve 37 is opened, the discharge port is communicated with the discharge pipe 23, the control valve 37 is closed, and the main shaft 25 is rotated by the driving mechanism 28 in a state of the compressed air not being supplied from the compressed air supply source. In the vertical shaft pumps 11, operation is switched from the forcible operation in air to the normal operation sequentially according to a rise of the water level in the water absorption tank 20 detected by a water level detection means 46. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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