Design And Experimental Study Of Macro Fiber Composite-driven Swing Type Piezoelectric Pump

Based on fishtail type piezoelectric pump and macro fiber composite,we proposed a macro fiber composite-driven swing type piezoelectric pump which has advantages of simple structure,no noise and no back flow and carried out some tentative work in the development of piezoelectric pumps and the applications of macro fiber composite.The main parts of this paper are as follows:The driver used in this paper is formed by MFC bonding beryllium bronze substrate.The relationship between the curvature of the driver and the thickness and modulus of the substrate is analyzed by using the classical laminated plate theory.The working principle of the swing type piezoelectric pump is established,and the theoretical flow is deduced.The static analysis of MFC and MFC driver is carried out to analysis the working mechanism of MFC and obtain the relationship between MFC driver’s amplitude and voltage.The result shows the maximum amplitude decreases as the thickness of the substrate increases.The modal analysis of the MFC driver is carried out to obtain the first four mode and the natural frequency.The results show that the first mode of MFC driver is suitable as the driving mode of the swing type piezoelectric pump.Set up experimental test system to test basic performance of MFC driver.The results show that with the increase of the thickness of the substrate,the first natural frequency of the MFC driver increases and the amplitude decreases.The overall deformation of the MFC driver at the first resonance frequency is measured,and the results show that the amplitude of MFC driver increases from the fixed end to the tail,which is consistent with the simulation result.In general,when the substrate material is the same,the smaller the thickness of the substrate,the larger the amount of deformation of the MFC driver.Three structural forms of swing type piezoelectric pump are designed-left in right out,left in upper out,upper in right out.The flow rate of the piezoelectric pump is analyzed.The simulation results show that the flow rate is 458 ml / min,68 ml / min,263 ml / min.On the whole,the structure of left in right out has better performance.So the left in right out structure is used in the following studies.Through velocity distribution and velocity vector at 0T,1/4T,2/4T,3/4T time,the working process of swing type piezoelectric pump of left in right out structure is analyzed emphatically.The influence of the distance between the end of the outlet and the thickness of the substrate on the output flow of swing type piezoelectric pump is explored by simulation.The simulation results show that the output flow rate decreases sharply with the increase of the distance between the outlet and the MFC driver when the distance between the outlet and the MFC driver is changed from 1mm to 5mm.When the thickness of the substrate changes from 0.2mm to 0.6mm,the output flow of the swing type piezoelectric pump is gradually increased with the increase of the thickness of the substrate.The piezoelectric pump test system is set up and experimental prototype is made.Under the condition of ensuring the consistency of other parameters,the five main parameters affecting the performance of the swing type piezoelectric pump are studied experimentally,including outlet and MFC driver end distance,MFC driver substrate thickness,outlet diameter,inlet diameter,flexible tail length.The experimental results show that the output flow of the swing type piezoelectric pump decreases sharply with the increase of the distance between the outlet and the end of MFC driver.When the flexible tail length changes from 2mm to 6mm,the output flow rate of the swing type piezoelectric pump increases first and then decreases with the increase of the flexible tail length.When the flexible tail length is 4mm,the maximum flow rate is 321ml/min.With the increase of the diameter of the outlet,the output flow rate increases first and then decreases.When the inlet diameter is 8mm,the output performance of the swing type piezoelectric pump is the best,the maximum output flow is 460ml/ min.The effect of inlet diameter on the output flow of the swing type piezoelectric pump is not obvious.