| 摘要 |
<p>Hydraulic pumping apparatus for producing pressurised liquid such as water comprises a press member (104) engaged in a base (102) with a close, sliding fit so that the press member can reciprocate smoothly in the base. On the forward stroke liquid below the press member is forced out through an outlet (114) and led off, to be used externally. The press member has an elongate portion (126) with holes (136; 138) in an upper end face (124) and a lower end face (128); these holes are closed during the down stroke and opened during the up stroke. The upper end face has a greater surface area than the lower and face and this further increases the pressure on the liquid below and gives a syringe-like output effect. This apparatus is especially suitable underwater in a vertical, and the weight of water above results in downward movement of the press member. The water below may be forced through a turbine to generate electricity. Buoyancy means (134) may be mounted around the press member to assist in the return stroke.</p> |
