Design of a Novel Jetting Dispenser Featuring Piezostack and Linear Pump

摘要

This article presents a novel jetting dispenser featuring piezoelectric actuator incorporated with a linear positive displacement pump, to achieve high dispensing flow rate with small dot size. A multi-stack type of piezoelectric actuator is adopted and its output displacement is amplified via a hydraulic magnification mechanism. After describing the configuration and operating principle of the proposed dispensing system, static modeling is undertaken by analytical method to determine design parameters. The analytical result is then proven by finite element analysis. Subsequently, structural dynamic modeling and fluid dynamic modeling are analytically undertaken. In the dynamic modeling, fluid-solid interaction is considered to predict the dispensing dot size and average flow rate of the dispenser. Dispensing performances are investigated by changing the driving voltage of the piezostack actuator and velocity of the linear piston of the pump.