Experiment And Research On Piezoelectric Pump With Unsymmetric Slopes Element

This subject came from National Natural Science Foundation Project (Project Number:50775109 ).Piezoelectric pump is distinct from traditional pump. It utilizes the converse piezoelectric effect of the piezocreamics. Under the effect of the electric field, the piezoelectric vibrator which is the driving part of the piezoelectric pump, will generate small deformation to achieve the goal of driving the fluid directly without the driving chain that is almost necessary for the traditional pump. Therefore compared with the traditional pump, the piezoelectric pump obtains the advantage as follows: less abrasion part, simply in structure, more inclined to be microminiaturization. For these points, the piezoelectric pump has currently turned out to hot spot in fluid machinery. Being one type of piezoelectric pump, the valeless piezoelectric pump holds the characteristic that the inlet and the outlet are connected during the whole working period. Thus this type of pump shares a promising application in fields like the drug delivering, chemical agents analysis and high polymer active cells transporting.This paper conducted the research on the Piezoelectric Pump with Unsymmetrical Slopes Element.Utilizing the commercial FEM software package ANSYS, both the modal and harmonic analysis on the piezoelectric vibrator under different supporting condition was carried out to draw the conclusion of vibration modes, resonant frequencies and maximum amplitudes. Through the comparison, the elastic supporting condition was selected for the vibrator for the purpose of reducing its first state resonant frequency and at the same time increase the maximum amplitude. The Scanning laser doppler vibrometer was adopted to measure the vibration condition with and with the load respectively, thereby the relationships between the amplitudes and driving frequencies were get. Next the 3D models for the pump chambers distinguishing in the slopes were generated and assisted by the FLUENT software, the moving grid technique was utilized aiming at researching the fluid mechanics of the pump chamber and simulating the pressure and speeding distribution as the vibrator was working. Therefore, the theoretical flow rates for different slopes were obtained. Additionally, based on the model the function of the mixing and stirring were preliminarily explored. Finally, the method for measuring the valveless piezoelectric pump was discussed and the drawbacks existing in the traditional method were also analyzed. Upon the points stated, a more reasonable yet simple method was proposed, which was used in measuring the relationships that the flow rates varied with the changing in the slopes and the driving voltage as well.