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This article relates generally to fluid pumps and more particularly to peristaltic pumps in which tube-threading difficulties and the torque required to drive the pump are minimized.
English (United States)
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Peristaltic Pump With Free-Floating Platen
This article relates generally to fluid pumps and more particularly to
peristaltic pumps in which tube-threading difficulties and the torque required to
drive the pump are minimized.
Referring to the above figure, a peristaltic pump 1 is shown which includes a
pump head 2 which contains four roller bushings 3 which in turn rotate against a
pump strap 4 as pump 1 rotates. Pump head 2 is driven by a DC stepper motor
(not shown). Silicone rubber or PVC tubing 6 is occluded between an arcuate
portion of a spring-loaded platen 7 and pump strap 4. The latter prevents the
silicone rubber or PVC tubing from stretching during pump rotation and permits
the maintenance of a relatively constant flow rate. Platen 7 is loaded by means of
springs 8 which are held in position by a platen/spring retainer bracket 9. Tube-
fitting retainers 10 carry tubing connectors 11 by means of which tubing 6 and
tubing 12 are interconnected. Tubing 12 may be made of PVC or other suitable
material. Tubing 6 is loaded between pump head 2 and pump strap 4 by inserting
either tubing connector 11 into the tube-fitting retainer 10, rotating pump head 2
by means of knob 13, either clockwise or counterclockwise, until tube- loading
slot 14 is exposed from under the arcuate portion of platen 7. Tube 6 is simply
started into the slot and continual rotation of pump knob 13 threads the tubing
between pump strap 4 and the arcuate portion of platen 7.