【作者】 王志军；

【导师】 杨志刚；

【作者基本信息】 吉林大学 ， 机械设计及理论， 2016， 硕士

【摘要】 微流体系统已经应用在生物、机器人和电子设备等相关领域。超小容积的应用加速了健康监测和生物学的研究并极大减少了分析时间和成本。在这些应用中,微泵对于任何微流体系统至关重要并且在最近几十年成为很有吸引力的课题。微泵大部分都是由压电振子驱动,因为压电振子具有结构简单、响应迅速、价格低廉等特点。本文结合国家自然科学基金项目的研究《压电驱动流体动耦合软体驱动器设计理论与关键技术究》(项目编号:51405189),设计并制作了基于合成射流原理的无阀气体压电泵(以下简称“无阀气体压电泵”),本无阀气体压电泵拥有尺寸小、结构简单、无传动件、易集成、易控制等特点,与合成射流激励器相比具有较强的流动方向控制能力。对这种基于合成射流原理的无阀气体压电泵进行仿真分析和试验研究,说明其工作原理并对相关结构参数进行研究。利用ANSYS软件建立压电振子的有限元模型,对其进行模态分析、静力学分析以及谐响应分析,并在此基础上进行实验测试,得到压电振子的输出位移,为系统仿真分析提供支撑。对无阀气体压电泵的流体区域创建三维仿真模型,利用ICEM软件对其进行网格划分,使用CFX软件,采用动网格技术对压电振子的运动规律进行模拟,根据实际情况确定模型的初始条件、边界类型、计算模型等条件。对CFX的仿真结果进行讨论,通过对无阀气体压电泵一个工作周期中不同时刻的流线图、矢量图的分析,详细说明该泵的工作原理;对无阀气体压电泵流量影响较大的四个参数—容腔高度、泵腔高度、射流孔直径、出口直径进行仿真对比分析,探索这些参数对流量的影响规律,作为压电泵的试制及试验参数调整的依据。设计制作无阀气体压电泵的试验样机,搭建试验测试系统,采用皂膜式电子流量计测量无阀气体压电泵的气体流量,在激励电压为120V,频率变化范围为40Hz~400Hz的条件下,选取对流量影响较大的四个参数—容腔高度、泵腔高度、射流孔直径、出口直径进行对比试验,考察相关参数对无阀气体压电泵流量的影响规律,验证了本文所设计的基于合成射流原理的无阀气体压电泵的结构可行性及工作原理的有效性。更多还原

【Abstract】 Microfluidic systems have been widely applied in the aeras of biological, chemica l analyses, robotics, and electronic instruments and so on. The use of ultrasma l l volumes accelerates health monitoring and biological research and significa nt ly reduces the analysis time and cost. In these applications, micropumps are essential for any microfluidic system and have been an attractive topic of research for decades. Most micropumps are drived by PZT vibrators, because vibrators have the characteristics of simple structure, fast response, low price and so on.This paper is based on The National Natural Science Fund(No. 51405189), valveless air piezoelectric pump based on the synthetic jet(valve-less air piezoelectric pump for short) is designed and manufactured.This pump has the characteristics of small dimensions,simple structure, none inner moving parts,integrality, easy to be controlled and so on,and it has strong fluid direction-controll ability, a flexible conduit can be installed on the outlet of the pump and deliver air to the destination needed. Simulation and experimental study on valve-less air piezoelectric pump are conducted to reveal the working principle and study on the relevant parameters.ANSYS is used to establish finite element model, modal analysis, static analys is, and harmonic response analysis are conducted on the vibrator. Scanning laser beam micrometer and Impedance Analyzer are used to test the vibrator.3D simulation model are established on the fluid domain of the pump, ICEM software is used to divide mesh on the model, CFX software is used to simulate the model with the technology of moving mesh to simulate the moving pattern of the vibrator. On the basis of the actual condition to determine the initial condition, boundary condition, calculation type. The CFX simulation results are studied, the streamline diagram and cloud chart in different time of the working cycle are analysed to illustra te the working principle. Simulation contrasting experiments are conducted on the four parameters pump chamber height h, cavity height H, outlet diameter d, jet orifice diameter D whose influences on the performance of the pump are relatively high, find how these parameters influence the pump performance and prepare for the trial-manufacture and contrasting experiments of the valve-less air piezoelectric pump.Experimental prototype of the valve-less air piezoelectric pump are designed and manufactured, the testing system are established, electronic soap film flowmeter is used to measure the flow rate of the pump. Contrasting experiments on the chamber height, cavity height, outlet diameter, jet orifice diameter are conducted on the the pump under the condition of 120 V voltage and frequency span of 40 Hz~400Hz, the influence law of the relative parameter on the valve-less air piezoelectric pump are studied.更多还原