초록 ▼

A precision controlled variable speed pumping system for controlling the operation of one or more independently driven pump motors includes one or more valveless rotary pumps each having a reciprocating piston directly driven by an individual stepping motor and a digital control circuit for individu

A precision controlled variable speed pumping system for controlling the operation of one or more independently driven pump motors includes one or more valveless rotary pumps each having a reciprocating piston directly driven by an individual stepping motor and a digital control circuit for individually directing the operation of each stepping motor whereby the resultant sum output of the pumps may be utilized for mixing, blending or proportioning fluid flow.

대표청구항 ▼

A fluid metering apparatus comprising: a first means for dispensing a first fluid; a second means for dispensing another fluid; means, associated with said first and second dispensing means, for combining said first and second dispensed outputs; and digital means for individually and simultaneously

A fluid metering apparatus comprising: a first means for dispensing a first fluid; a second means for dispensing another fluid; means, associated with said first and second dispensing means, for combining said first and second dispensed outputs; and digital means for individually and simultaneously controlling the operation of said first and second dispensing means, said digital control means providing a metered ratio of said first dispensed output to total dispensed output and including a first digital stepping motor operatively connected to said first dispensing means, a second digital stepping motor operatively connected to said second dispensing means, and control circuit means for individually and simultaneously controlling the operating states of said first and said second digital stepping motors wherein said control circuit means includes means for providing a series of fixed frequency pulses, means for dividing the pulse frequency in evenly spaced pulses, said frequency divider means being connected to said pulse providing means for providing a divided down output, and means, connected to said frequency divider means, for steering a first portion of said divided down frequency output pulses to a first path while simultaneously steering a second portion of said divided down frequency output pulses to a second path, wherein said first path connects to said first digital stepping motor and said second path connects to said second digital stepping motor.