| 摘要 |
PROBLEM TO BE SOLVED: To provide a collective pump device capable of stably maintaining its overall operation by controlling the pumping and no-load running of each of pump devices according to an inflow amount to stabilize a water level in a water storage pit. SOLUTION: This collective pump device comprises the plurality of pump devices 12 disposed in the water storage pit 10. Each of the pump devices 12 comprises a pump casing 18 suspended in the water storage pit 10 and an impeller 22 rotated in the pump casing 18. The collective pump device comprises an air filling device 46 feeding air into the pump casing 18 of the pump device 12 and a control device 44 controlling the feeding of air from the air filling device 46 into the pump casing 18. COPYRIGHT: (C)2006,JPO&NCIPI
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