Pumps – Motor driven – Fluid motor
Patent
1984-11-13
1986-01-14
Smith, Leonard E.
Pumps
Motor driven
Fluid motor
417385, F04B 4310
Patent
active
045643407
ABSTRACT:
A device for regulating in a practically loss-free manner the pressure and feed volume of a diaphragm pump which is constructed as a hydraulically activatable diplacement pump and is especially suited for feeding a viscous and abrasive or a solids-laden secondary fluid medium. In the device, access is required only to the environment of the primary working fluid medium, and no direct interchanges between the secondary medium being fed and parts of the control device are required. During the pressure phase of the diaphragm pump, a limited quantity of the primary working medium is extracted from a portion of the housing of the device which is in direct and uninterrupted communication with the associated working section, while during the suction phase and in dependence on the overpressure of the primary working fluid medium in the device a compensation is made for the quantity of the primary working fluid medium lost during the pressure phase. The arrangement is such that at a pressure below an adjustable threshold pressure, a complete compensation is effected, while at a pressure above such a threshold pressure an incomplete compensation is effected which becomes more so as the difference between the overpressure and the threshold pressure increases, and that during the suction phase, proportional to the increasing compensation deficit, the primary working fluid medium within the associated working section of the pump is charged with gas from the surrounding atmosphere of the diaphragm pump.
REFERENCES:
patent: 2303597 (1942-12-01), Adelson
patent: 2959131 (1960-11-01), Shoosmith
patent: 3075468 (1963-01-01), Eifel
patent: 3107624 (1963-10-01), Williams
patent: 3257952 (1966-06-01), McCormick
patent: 3367270 (1968-02-01), Schlosser
Abel Pumpen GmbH
Dubno Herbert
Ross Karl F.
Smith Leonard E.
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