PIEZOELECTRIC PUMP

摘要

Peristaltic pump, comprising flexible tube for dispensing liquid, a plurality of piezoelectric actuators disposed across a portion of the tube, for applying pressure on the outside surface of the tube, in order to collapse the surface. The piezoelectric actuators are sequentially activated by timing and control means, to cause sequential collapse of points along the tube surface, thereby causing liquid flow in the tube. Each piezoelectric actuator is attached to pressing element(s), for exerting pressure on the tube upon actuation of the piezoelectric actuators. Each pressing element has a cross-section of an essentially right-angle triangle, one acute angle of which directs to the desired flow direction, in order to force the liquid to flow in that desired direction. In an embodiment of the invention, pairs of pressing elements are arranged face-to-face along a portion of the tube, for simultaneously pressing the portion of the tube between the elements of each pair.