| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that a pump is required which can pump by itself after water is stored again even though pumping is temporarily interrupted because of a drought state when pumping from high depth having a small aperture with groundwater stored intermittently, for example, from a boring hole of 10 m or more from the ground to a water surface. SOLUTION: A high depth groundwater pumping apparatus is composed of a water ejector 12 connected to the upper end part of a lifting pipe 2, a check valve 7 connected to the lower end part of the lifting pipe and opened when the inside of the lifting pipe is negative pressure, a branch pipe 8 branched from the lifting pipe in the upper end part of the check valve, a valve 10 connected to the branch pipe and intermittently opened/closed, a compressor 11 for supplying compressed air to the valve, a reservoir tank 14 for groundwater delivered from the water ejector, a circulating pump 15 for feeding groundwater as driving fluid for the water ejector, and a drainage pump 18 for drawing groundwater so that a groundwater level in the reservoir tank is conserved. COPYRIGHT: (C)2007,JPO&INPIT
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