Patent ID: 6017194
Filing Date: 2000-01-25
Classification: F04B,G01N

Abstract:
A method for controlling the drive means for a reciprocating piston pump delivering liquid to a spring loaded piston accumulator having a main spring and an adjustment spring whose force combine additively through a sensor lever, wherein the improvement comprises the steps of:a. Measuring the liquid volume in said accumulator means by sensing means detecting the position of said accumulator piston and producing a voltage proportional to the movement of said accumulator piston from a datum position, andb. Amplifying the power of said voltage by amplifying means selected from the group consisting of vacuum tube and semiconductor devices, andc. Applying continuously said amplified power to an electrical motor component within said pump drive means which drives said reciprocating piston pump, andd. Delivering more liquid from said reciprocating piston pump into said spring loaded piston accumulator with increases of said amplified power and delivering less liquid with decreases of said amplified power, ande. Arranging the magnitude and sense of the said amplified power to stably maintain the position of said accumulator piston substantially fixed;whereby the liquid pressure in said accumulator means is maintained substantially constant with liquid flows out of the accumulator means ranging from zero up to a maximum capacity of said reciprocating piston pump.