| 摘要 |
A pump, particularly intended for use in pumping water from bore holes in the developing countries, comprises a cylindrical casing (2), the interior of which is divided into first and second chambers (12, 14) by a tubular flexible membrane (16), and having inlet and outlet valves (8, 10) at either end thereof communicating with the interior of the first chamber (12). When the second chamber (14) is pressurised, the membrane (16) is deformed inwardly, the inlet valve (8) closes and the water contained in the first chamber (12) is forced out through the outlet valve (10). When the pressure is released, the outlet valve (10) closes and the inlet valve (8) opens and the first chamber (12) is refilled. The pump may be powered by hydraulic pressure using a manually operated piston or pneumatic pressure using a rotary compressor which is readily adaptable to a variety of energy sources. |
