Pumps – Motor driven – Relatively movable pumping members driven by relatively...
Patent
1976-01-15
1977-05-03
Vrablik, John J.
Pumps
Motor driven
Relatively movable pumping members driven by relatively...
F04B 1700
Patent
active
040211568
ABSTRACT:
Two hydraulic pressure intensifiers are coupled in parallel between a source of hydraulic fluid at relatively low pressure and an output path. Each intensifier provides a pressurizing stroke in only one direction of linear reciprocation. The intensifiers are so operated, under the control of a hydraulic circuit, as to create a tendency for an initial portion of the pressurizing stroke of each of the intensifiers to overlap a final portion of a preceding pressurizing stroke of the other intensifier, and thereby to deliver high pressure hydraulic fluid to the output path simultaneously with continuing delivery from such other intensifier. Such simultaneous delivery does not actually occur, however, since the hydraulic circuit is so arranged that the delivery of high pressure hydraulic fluid from each intensifier to the output line can begin only upon a falling off in the pressure provided by the other intensifier. Meanwhile, as soon as the pressure in the hydraulic fluid flowing from such other intensifier to the output line begins to fall off, such flow at decreasing pressure is interrupted. A surge-free flow of hydraulic fluid at a relatively high pressure is, thus, continuously present in the output line.
REFERENCES:
patent: 2442916 (1948-06-01), Buchanan
patent: 2660955 (1953-12-01), Kent et al.
patent: 3077838 (1963-02-01), Maglott
patent: 3773438 (1973-11-01), Hall et al.
patent: 3893790 (1975-07-01), Mayer
Fuchs, Jr. Francis Joseph
Shaffer John Richard
LaPointe G. P.
Rosen A. S.
Vrablik John J.
Western Electric Co.
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