| 摘要 |
<p>A pump arrangement particularly intended for pumping water from deep wells, in which a feed pump unit (2) located at ground level transmits power and motion to a delivery pump unit (3), so that during a working stroke of the pump arrangement water is raised through a delivery pipe (5) which is connected to the delivery pump unit (3) via a pressure valve (10), and in which during a return stroke of the pump arrangement water flows into the delivery pump unit through a well-water inlet pipe which is connected to the delivery pump unit via suction valve (11). In accordance with the invention a compressible and expandable chamber (6) in the feed pump unit (2) is connected to a similarly compressible and expandable chamber (7) in the delivery pump unit (3) by means of a hydraulic line (4), and the two chambers (6, 7) and the hydraulic line (4) together form a closed hydraulic system. A return spring (9) is arranged to support the compression of the chamber (7) of the delivery pump unit during the return stroke of the pump arrangement.</p> |
