| 摘要 |
PURPOSE:To reduce vibrations of a liquid lifting pipe and a drive shaft pipe caused by operation of a pump, by positioning the upper opening end of a self- feeding pipe piercing through the bottom of a closed tank, in the upper part of the closed tank. CONSTITUTION:There is provided a self-feeding pipe 13 having its upper section positioned in a closed tank 2 and extending downward through a hole 12 in the bottom 3a of a closed bottom cylindrical body 3. The upper opening end 14 of the self-feeding pipe 13 is positioned at an upper level in the closed tank 2. Further, the feeding pipe 13 is in parallel with a drive shaft pipe 7 and a liquid lifting pipe 10, and has its lower opening end 15 positioned in the vicinity of the bottom 1b of a storage tank 1. When the liquid surface lowers down to a predetermined level (c) due to the pumping-up of the liquid in the closed tank 2 by the operation of a pump part 9 through the liquid lifting pipe 10, liquid in the storage tank 1 comes up through a self-feeding pipe 13, overlows from the upper opening end 14 and falls into the closed tank 2. |
