Liquid chromatograph

Details Liquid chromatograph Liquid chromatograph

1986-09-17

1988-06-21

Fisher, Richard V.

Liquid purification or separation

Flow, fluid pressure or material level, responsive

Proportionate feed means

2101982, 210656, 417 18, B01D 1508, F04B 4900

Patent

active

047523859

ABSTRACT:
The liquid chromatograph comprises a multiple piston pump (1) which is arranged so that the delivery strokes of two pistons overlap to such an extent that for all designed liquid delivery pressures and compressibilities no period exists when no piston is delivering liquid. Thus for all other than worst case conditions there are periods in each pump cycle when two pistons are delivering liquid. The start of these periods is detected by the pressure increase produced at the outlet of the pump and measured by a pressure transducer (5). The output of the pressure transducer is fed via path (14) to a motor drive circuit (10) which controls a motor (4) which drives the pump (1) via a shaft (3) so that the speed of advance of the pistons is halved until one of the pistons ceases delivery. Consequently a relatively pulse free liquid flow is produced by the pump with a relatively simple motor speed control system.

REFERENCES:
patent: 3816029 (1974-06-01), Bowen et al.
patent: 4359312 (1982-11-01), Funke et al.
patent: 4422942 (1983-12-01), Allington
patent: 4448692 (1984-05-01), Nakamoto et al.
patent: 4492524 (1985-01-01), Koch et al.

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