Pumping apparatus

Details Pumping apparatus Pumping apparatus

1973-11-19

1976-09-21

Freeh, William L.

Pumps

Condition responsive control of pump drive motor

In response to pump speed

417539, 417568, F04B 4900

Patent

active

039816206

ABSTRACT:
A compact pumping system especially useful in liquid chromatography wherein comprising a liquid path which is fully flushed in each stroke of a pump, a pump which provides substantially pulse-free flow, a pressure-sensor integrated into said flow path and operably connected to the control circuit of a bifilar stepping motor. This circuit is so designed that the driving current applied to the motor is only that required to pump the liquid. The avoiding of heat associated with a greater current is particularly important in forming a compact package of motor and pump for use in liquid chromatography.

REFERENCES:
patent: 479960 (1862-08-01), Van Depoele
patent: 2010377 (1935-08-01), Sasson
patent: 2535617 (1950-12-01), Westbrook
patent: 3016843 (1962-01-01), Smith
patent: 3125963 (1964-03-01), Whitley et al.
patent: 3145629 (1964-08-01), Gottzmann
patent: 3298319 (1967-01-01), Savage
patent: 3301189 (1967-01-01), Kling
patent: 3330217 (1967-07-01), Bauer et al.
patent: 3670630 (1972-06-01), Tyson et al.
patent: 3737251 (1973-06-01), Berman et al.
patent: 3749525 (1973-07-01), Hooper
patent: 3810716 (1974-05-01), Abrahams et al.
patent: 3816029 (1974-06-01), Bowen

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