| 摘要 |
PROBLEM TO BE SOLVED: To avoid water failure at a demand end part beforehand by changing at least two pumps to series connection when an inverter is broken, converting a driving power supply to commercial power supply, and simultaneously starting the pump connected in series when pressure attains predetermined start pressure and less in a water supplying pipe. SOLUTION: In a speed-up water supplying pump device, a plurality of pumps 4, 4' are operated with a frequency of a commercial power supply frequency or more through an inverter control device. In this case, a pump power supply is converted into commercial power supply by a control device 12 when the inverter control device is broken. A triangular electric sluice valve 6 arranged on a discharge side of the pump 4 is operated, and a discharge side of the pump 4 is connected to a suction side of the pump 4' through a connecting pipe 11. A triangular electric sluice valve 6' arranged on a suction side of the pump 4' is operated flow from a water receiving tank 1 is broken, and the pumps 4, 4' are connected to each other in series. When pressure in a water supplying pipe 10 attains a predetermined start pressure and less, the pumps 4, 4' are simultaneously started, and feed of water is started.
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