Pumps – Motor driven – Fluid motor
Patent
1988-08-24
1989-12-12
Smith, Leonard E.
Pumps
Motor driven
Fluid motor
F04B 4310, F04B 4704
Patent
active
048864285
ABSTRACT:
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 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) or the delivery pump unit during the return stroke of the pump arrangement. The return spring comprising rubber springs firmly connected to a hose-like body forming the expandable chamber (7).
REFERENCES:
patent: 1852242 (1932-04-01), Holt
patent: 2196993 (1940-04-01), Kidder
patent: 2464095 (1949-03-01), Nies
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