PRECEDING STAND-BY TYPE VERTICAL SHAFT PUMP

摘要

PROBLEM TO BE SOLVED: To prevent the occurrence of hunting in a preceding stand-by type vertical shaft pump. SOLUTION: The preceding stand-by type vertical shaft pump 1 comprises a main air supply pipe 16 and an auxiliary air supply pipe 17. The main air supply pipe 16 has a lower end 16a communicated with a main air hole 6a formed in a suction casing 6 under the lower end of an impeller 11 and an upper end 16b opened to the atmosphere at the upper side of an assumed maximum water level WL1 in a suction water tank 2. The auxiliary air supply pipe 17 has a lower end 17a communicated with an auxiliary air hole 6b formed in the suction casing 6 above the main air hole 7a and under the lower end of the impeller 11 and an upper end 17b opened to the atmosphere at the upper side of the assumed maximum water level WL1. COPYRIGHT: (C)2007,JPO&INPIT