Pumps – Motor driven – Fluid motor
Patent
1982-11-01
1985-04-30
Smith, Leonard E.
Pumps
Motor driven
Fluid motor
92 85B, 92143, 92171, F04B 2108
Patent
active
045141487
ABSTRACT:
An hydraulic cylinder for driving a reciprocating pump at 5000 to 10,000 psi pressures having a separate spool casing which serves as a detachable extension of the cylinder. The detachable spool casing houses in a single grouping seals for the fluid being pumped, seals for the hydraulic fluid driving the piston, a bearing for the piston rod, and lubricating means for the seals and bearings. This construction provides ready access to these parts for repair and assures concentricity between the piston rod and the bearings and seals in which it reciprocates.
In one embodiment a wiper ring is provided between seals to scrape from the piston rod abrasive material in the fluid being pumped and discharge it from the cylinder. In another embodiment an external shock absorber decelerates the piston at one end of its extended stroke, the shock absorber also serving to actuate a valve controlling flow of hydraulic fluid to the cylinder.
REFERENCES:
patent: 1066483 (1913-07-01), Fournia
patent: 1536787 (1925-05-01), Grace
patent: 1879370 (1932-09-01), McAllister
patent: 2898867 (1959-08-01), Saalfrank
patent: 3540741 (1970-11-01), LeFebvre
patent: 3929057 (1975-12-01), Kondo
patent: 4055107 (1977-10-01), Bartley
patent: 4211151 (1980-07-01), Wallischeck
Carter Controls, Inc.
Smith Leonard E.
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