Low pulsation displacement pump

Details Low pulsation displacement pump Low pulsation displacement pump

1988-08-05

1990-04-03

Croyle, Carlton R.

Pumps

Condition responsive control of pump drive motor

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

417 15, 417 16, 417 44, 417 53, F04B 1100

Patent

active

049136240

ABSTRACT:
A low pulsation displacement pump has a pair of plungers and motor driven-cams or feed screws for reciprocating the plungers. In order to cause the pump to stably discharge a liquid so that variation in discharge due to machining errors of the plungers or the feed screws is eliminated, the pump discharge pressure is measured at each of a plurality of predetermined operative positions of the plungers before delivery of the pump from a manufacturing plant, and machining errors are obtained in accordance with the thus-measured discharge pressure. Then, the speed correction factor for the motor is calculated for each of the plurality of predetermined positions of the plungers in accordance with the thus-obtained errors to store the results of the calculation in a memory. When the pump is used, the motor is operated while the speed of the motor is compensated for at each of the plurality of predetermined positions of the plungers in accordance with the speed correction factor stored in the memory, whereby the rate of discharge of pump can be kept substantially constant by preventing speed variation of the plungers due to machining error of the cams.

REFERENCES:
patent: 4137011 (1979-01-01), Rock
patent: 4352636 (1982-10-01), Patterson et al.
patent: 4448692 (1984-05-01), Nakamoto et al.
patent: 4507055 (1985-03-01), Fair et al.
patent: 4600365 (1986-07-01), Riggenmann
patent: 4681513 (1987-07-01), Saito et al.
patent: 4772388 (1988-09-01), Allington

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