Methods and apparatus for producing uniform discharge and suctio

Details Methods and apparatus for producing uniform discharge and suctio Methods and apparatus for producing uniform discharge and suctio

1984-12-14

1987-05-19

Croyle, Carlton R.

Pumps

Condition responsive control of pump drive motor

Plural pumps having separate drive motors, supply sources,...

91361, 91532, 417 46, 417 53, 417345, F04B 4106, F15B 1307

Patent

active

046663746

ABSTRACT:
A pumping system for producing uniform discharge and suction rates includes a pump connected to a supply of hydraulic fluid to deliver hydraulic control fluid at a selectable flow rate to a proportioning valve. The proportioning valve divides the flow of hydraulic fluid into two resulting flows, each of which is utilized via a four-way valve to drive a piston within a hydraulic cylinder. The positions of the pistons within the cylinders are detected and used to control the proportioning valve such that each piston is imparted with a velocity that varies in a sinusoidal manner in response to the hydraulic fluid delivered to it by the porportioning valve. Sensing of the piston positions and control of the proportioning valve may be accomplished mechanically by a system of cams driven by the pistons, or electronically by a microprocessor receiving signals from transducers coupled to the pistons. The speed of operation of the overall system is adjustable in response to the rate of delivery of hydraulic control fluid from the hydraulic pump.

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patent: 4231441 (1980-11-01), Burckhardt
patent: 4321014 (1982-03-01), Eburn, Jr. et al.
patent: 4470771 (1984-09-01), Hall et al.
patent: 4490096 (1984-12-01), Box

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