Peristaltic pump with variable flow - has automatic control effected by movement of constriction in tube

摘要

The peristaltic pump has progressively variable flow for liquids of different viscosities. Controls is effected by movement of a constriction in the length of a tube. A pump rotor (10) has pulleys (11) which compress a flexible tube (12) to drive a liquid (13) from a reservoir. The tube is fixed to a plate (14) to prevent movement. The tube opens onto rigid calibrated tube (15) mounted between opto electronic sensors (16, 17) sensing liquid levels. Pump rotor is driven by an electric step motor at speed determined by automatic control circuit which provides automatic correction to flow rate.