To reduce fine particles and the air mixed in a storage pump.
When a vacuum pump 10 is driven to discharge the air in a storage pump tank 6, the air in the storage pump 7 is also discharged from a pressure balance port 7b so that groundwater W flows into the tank to be in a high water level state. Subsequently, the storage pump 7 is driven to cause the groundwater W outside a well strainer pipe 4 to flow into a well pipe 3 from a water passing hole 4a. The groundwater W in the well pipe 3 flows along a guide plate 26 of a cyclone 5 into the cyclone 5, and flows down along the inner periphery in a cylindrical part 24. Fine particles S such as sand in the groundwater W are subjected to centrifugal separation, and the separated fine particles are descended along the inner surface of the cylindrical part 24 into a sand storing tank 11 to be removed. Water of the groundwater W rises from the center of the cylindrical part 24 while causing a whirlpool, and flows into a storage pump tank 6. The groundwater W flowing into the storage pump tank 6 flows from an upper end part 8a of a storage pump receiving tray 8 into the storage pump receiving tray 8 to be discharged on the ground by the storage pump 7.
| JP2006070564A | 2006-03-16 | |||
| JP2007100401A | 2007-04-19 | |||
| JPS57183595A | 1982-11-11 | |||
| JP2000073998A | 2000-03-07 |
Tadashi Takahashi
Takashi Watanabe
Suzuki Mitsuyoshi
Kazuya Nishi
Yasuhiko Murayama