To provide a pump device capable of highly reliability forming a self-siphon and performing siphon destruction at a low equipment cost using a simple piping system in which an electrically-operated valve requiring control is not required and the system is free of such a situation that the siphon formation or destruction is not carried out owing to a failure etc. in the electrically-operated valve.
The pump device with a pump discharge pipe 11 formed in a siphon shape is configured so that a one-end opening of a siphon auxiliary pipe 15 is connected with the top 12 of the discharge pipe, and in the siphon auxiliary pipe, a pipe descending portion 16, a pipe bottom 17, and a pipe ascending portion 18 are formed continuously where the in-pipe top level of the pipe bottom 17 is discharged and lies at or blow the normal water level NWL of the water surface, and a plurality of openings are formed from the pipe bottom 17 toward the pipe ascending portion 18, while the top level of the first opening B formed at a boundary between the pipe bottom 17 and the pipe ascending portion 18 is discharged and lies at or below the NWL, and the top level of the second opening A formed at the top of the pipe ascending portion 18 is discharged and lies at or over the planned highest water level HWL of the water surface.
TAKASHIMA MICHIO
SUZUKI SHINJI
| JP2002098085A | 2002-04-05 | |||
| JP2009162191A | 2009-07-23 | |||
| JPH05231396A | 1993-09-07 | |||
| JPH05231397A | 1993-09-07 |
Takashi Kumagai
Masato Ota