| 摘要 |
PROBLEM TO BE SOLVED: To provide an energy-saving lifting pump device and its operating method, for securing an optimum pump operational status, in contradictory pump specifications of high lift and low lift before and after providing siphonage. SOLUTION: A plurality of lifting pumps Pa, Pb are connected in series with each other, a suction port 3a of the lifting pump Pa of the start end part is opened to the inside of a suction tank 1. A discharge pipe 4 led upward from the discharge port 3b of the lifting pump Pb of the ultimate end part has a tip opening part 4e led down below the water surface of a discharge tank 2. All of the plurality of the lift pumps Pa, Pb are driven in starting the lift. When the siphonage is provided between the suction tank 1 and the discharge tank 2 through the discharge pipe 4, only the minimum numbers of the lifting pumps are operated and the other pumps are stopped to function as a discharge water passage or a suction water passage. COPYRIGHT: (C)2006,JPO&NCIPI
|
