Research On Micro-jet Generator For Nanoparticle Solution

Rapid prototyping is proposed in1980s as an emerging manufacturing technology.People show a great enthusiasm and pay a high attention on it, so rapid prototypingquickly becomes a hot field of manufacturing. Based on the principle of materialdeposition method, rapid prototyping is consist of mechanical engineering, CAD,reverse engineering technology, layered manufacturing technology, numerical controltechnology, materials science, laser technology. You can fabricate a designed metal part,without mold, automatically, directly, fast and accurately by rapid prototyping. Itprovides an efficient, cheap way to manufacture metal parts by which break out anumber of restrictions by the traditional method or material deformation method, and iscalled a leap in the manufacturing field. Rapid prototyping technology has broadapplication prospects in aerospace, machinery and electronics, and medical and healthfields. In practical engineering applications, how to manufacture metal parts withspecial requirements has become the most important direction of rapid prototyping.Studying on making metal parts by rapid prototyping technology will be helpful for thedevelopment of advanced manufacturing technology. Therefore, it is necessary to designa device for manufacturing metal parts by rapid prototyping. Inkjet printing technologyis rapidly developing since the1980s. As the manufacturing process is improved, theresolution of the inkjet printer becomes better. Inkjet printing technology has beenextended to microelectronics, biotechnology, and many other emerging fields. In thispaper, a new kind of piezoelectric micro jet generator, based on the principle ofpiezoelectric on-demand-drop technology, is designed for nanoparticle solution. Thegenerator will effectively achieve the ejection of nanoparticle solution. This researchhas done a lot of work to accumulate prior experience of getting piezoelectric inkjetprinting technology into the field of rapid prototype micro-parts.This article proposed a new type of piezoelectric micro-droplet ejection generatorfor nanoparticle solution. Firstly, the structure and working principle of the generatorwere described in detail. The transient analysis of the drive element model was done byusing ANSYS simulation software. So was the influence of pulse excitation on thevibration of the drive element. Secondly, the element model of the injection generatorwas created. The professional multiphase flow simulation software CFD-ACE2009+was used to do the simulation analysis about the process of ejecting droplets bypiezoelectric micro-droplet ejection generator, pressure distribution in the generator andthe attitude of droplets in flight. Then do the analysis about how the injection cavitystructure, physical properties of nanoparticle solution and the pulse excitation had ainfluence on droplet ejection parameters. At last, the experimental prototype of thepiezoelectric micro-droplet ejection generator was developed. The relationships between the minimum driving voltage amplitude and the driving frequency for jetinjection were analyzed. The nanoparticle solution was jetted in the experience.