Controlled pumping system

Details Controlled pumping system Controlled pumping system

1976-06-04

1978-05-16

Husar, C. J.

Pumps

Motor driven

Pump and motor interconnected by endless flexible...

74 8915, 128218A, 417419, F04B 3504

Patent

active

040896242

ABSTRACT:
A pumping system for dispensing controlled and variable amounts of fluids in predetermined quantities includes a pump piston which moves axially in a pump chamber. The piston is reciprocated by a drive lead nut cooperating with a non-rotatable lead screw attached to the piston. The piston is sealed to the pump chamber by a seal element whose distance from the lead nut is fixed regardless of the position of the piston, thus protecting the seal. The rotatably driven lead nut includes a hollow driven shaft, containing lubricant, so that the lead screw is lubricated as it travels into the shaft of the lead nut. The motor for the system is a pulse operated reversible stepping motor enabling accurate output from the pump, for example, between .01 ml/min to 9.99 ml/min as controlled by the stepping motor. One motor may drive two pumps for a continuous controlled pumping system. If desired a flush mechanism may be used to rinse the piston of any pumped material which adheres to the surface.

REFERENCES:
patent: 996128 (1911-06-01), Payne et al.
patent: 1552068 (1925-09-01), Lee
patent: 1751139 (1930-03-01), Feinstein
patent: 1988480 (1935-01-01), Campkin
patent: 2543100 (1951-02-01), Engh
patent: 2606454 (1952-08-01), Westling
patent: 3335724 (1967-08-01), Gienapp
patent: 3623474 (1971-11-01), Heilman
patent: 3838948 (1974-10-01), McCorvey
patent: 3880138 (1975-04-01), Wooten et al.
patent: 3943717 (1976-03-01), Schexnayder

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