Pumps – Condition responsive control of pump drive motor – Single motor control element responsive to means sensing...
Patent
1988-12-14
1990-05-15
Smith, Leonard E.
Pumps
Condition responsive control of pump drive motor
Single motor control element responsive to means sensing...
417 45, 417 63, 417415, F04B 4902
Patent
active
049253719
ABSTRACT:
A system for controlling the throughput of a metering pump, the pump including a pumping member (8) driven by a transmission member (4) for converting rotary motion of a reversible drive motor (1) into reciprocating motion of the pumping member, the system comprising means for adjusting the amplitude of the reciprocating motion and means for adjusting the period of said motion. The means for adjusting the amplitude of said reciprocating motion comprise: a sensor (23) for sensing the displacement of the transmission member (4) and for emitting a value which is a function of the value of the amplitude of the displacement; a comparator (21) for comparing said value with an adjustable reference value (20) and for emitting an output signal when the compared values are equal; and an electronic control circuit (24) receiving the signal emitted by the comparator (21) at an input, and responding to said signal firstly by switching over the power supply to the motor (1) in order to reverse its direction of rotation, and secondly by activating detection means (22) for detecting that the transmission member has returned to an origin position; said detection means (22) sending a signal to the electronic circuit when the origin position is reached, with the electronic circuit (24) responding thereto by switching off the power supply to the motor (1); and the means for adjusting the period of the motion are constituted by a pulse generator (28) for sending pulses to the electronic circuit (24) which responds thereto by powering the motor (1) so as to move the transmission member (4) away from said origin position.
REFERENCES:
patent: 3985019 (1976-10-01), Boehme et al.
patent: 4326837 (1982-04-01), Gilson et al.
patent: 4681513 (1987-07-01), Saito et al.
patent: 4702674 (1987-10-01), Fontaine et al.
Dosapro Milton Roy
Scheuermann David W.
Smith Leonard E.
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