| 摘要 |
A pump arrangement particularly intended for pumping water from deep wells, in which a feed pump unit located at ground level transmits power and motion to a delivery pump unit, so that during a working stroke of the pump arrangement water is raised through a delivery pipe which is connected to the delivery pump unit (203) via a pressure valve, and in which, during a return stroke, water flows into the delivery pump unit through a well-water inlet pipe which is connected with the delivery pump unit via a suction valve, wherein a compressible and expandable chamber incorporated in the feed pump unit is connected to a similarly compressible and expandable chamber (207) incorporated in the delivery pump unit (203) by means of a hydraulic line; the two chambers and the hydraulic line together form a closed hydraulic system; and a return spring is provided for supporting the compression of the chamber (207) of the delivery pump unit during said return stroke. In accordance with the invention, the chamber (207) of the delivery pump unit (203) comprises a bellows-cylinder which can be dilated solely in the radial direction and which comprises a hoselike body (221), made of a flexible material, and the return spring comprises rubber springs (228).
|
