基于超声振动的微液滴生成装置设计与实验研究

Design and Experiment Study of Micro Droplet Generator Based on Ultrasonic Vibration

设计了一种基于V型直线超声电机驱动的微液滴生成装置用于制备具有微米级尺寸的微液滴。此装置由基于V型直线超声电机驱动的微液滴生成部件、基于V型直线超声电机的三维位移控制平台和基于压电振子的微液滴分离部件组成。其中,生成部件包含超声电机、医用注射器、硅胶软管和自制的玻璃基微喷嘴。利用控制器驱动直线超声电机高精度地移动,由滑台推动注射器,在玻璃基喷嘴尖端产生附着的微小液滴;再利用压电振子激发杆状喷嘴的固有振型,使得附着的液滴克服粘性力从微喷嘴尖端分离,落在一定的范围内,并计算生成的球形微液滴的半径。以蒸馏水作为初始液体,探究此装置生成的微液滴的特性。研究结果表明,蒸馏水在直线电机的精密驱动下,在微喷嘴尖端形成附着的球冠状液滴。通过分离部件的振动,附着的液滴克服自身的粘性力从喷嘴尖端分离,形成球形液滴,通过测量得出此装置生成的球形液滴的半径小于40μm。

A micro droplet generator based on V-shape linear ultrasonic motor was prepared to produce micro droplets with higher accuracy in the field of biochemistry. The device was composed of a micro droplet generator which was driven by the V-shaped linear ultrasonic motor,a three-dimensional displacement platform based on V-shaped linear ultrasonic motor,and a micro droplet separation unit based on the piezoelectric vibrator. The generating part consisted of an ultrasonic motor,a medical syringe,a silica flexible tube and a self-made micro nozzle based on glass. Utilizing the drive controller to drive the linear ultrasonic motor,the slipway pushes forward the syringe and the micro droplet was attached to the glass nozzle. The natural mode of the rod nozzle was excited by the piezoelectric vibrator. The attached droplet was separated from the tip of the nozzle after overcoming the viscous force. The separated droplet fell in a certain range. And the radius of the spherical droplet was calculated. In the experiment,distilled water was used as the initial liquid to investigate the characteristics of the micro droplets produced by the device. The experimental results showed that the droplet was attached to the tip of the micro nozzle which was formed by distilled water under the linear motor.By the vibration of the separation unit,the attached droplets formed the spherical droplets by overcoming the viscous forces in the tip of the nozzle. The radius of spherical droplets generated by this device was less than 40μm by measuring the size.