压电驱动精密流量阀的设计与优化

发布时间：2018-06-29 07:53

本文选题：压电驱动精密流量阀 + 柔性铰链　；参考：《南昌大学》2016年硕士论文

【摘要】：流量阀是液压系统中的一个重要元件,其作用是控制流体的流向、流量以及压力。一般工程上需要对流体进行控制,用的大多是传统的电磁力矩马达驱动式的控制阀,这种阀结构复杂、体积大、控制精度低,难以满足对微流量流体的精确控制,特别是高压下的微流量流体的精确控制。本文利用压电陶瓷材料作为驱动元件,配合金属橡胶材料,设计了一种新型的压电驱动精密流量阀。由于压电陶瓷具有微/纳米级的精密位移输出能力,使得压电驱动精密流量阀能利用其高位移分辨率控制阀芯的开启,从而实现精密的流量输出控制,并且将金属橡胶安装在阀的进出口处,利用其节流减压特性,使阀口前后的压差减小,阀中流体速度变化平缓,减小气蚀破坏。本文所设计的阀采用柔性铰链杠杆机构作为动力源与阀芯运动机构之间的动力传输装置和位移放大装置。采用有限元分析软件对柔性铰链杠杆机构进行静动态特性分析,得到了机构的静变形云图和Von Mises Stress云图。根据分析结果,对柔性铰链杠杆机构进行了参数优化,优化结果使得该机构在满足阀芯运动具有良好的动态特性下,柔性铰链的体积比优化前减少了16%。实现了柔性铰链杠杆机构轻量化的目标。另外,本文基于有限元软件平台,对压电驱动精密流量阀的阀芯及其周围流场建立了参数化的有限元模型,进行了流固耦合分析,先通过对流体域的流场分析,取得了阀稳态时的内部流体压力场的分布规律;再将流体分析结果导入到对阀芯固体域的静力学分析中,对阀芯固体域进行静力学分析,得到流固耦合作用下阀芯的静变形云图及Von Mises Stress云图。根据流固耦合分析结果,对阀芯进行结构参数优化。优化后,在保证阀芯工作可靠性的条件下,阀芯体积减少了13.5%,实现了阀芯的轻量化。
[Abstract]:Flow valve is an important component in hydraulic system. Its function is to control the flow direction, flow rate and pressure of fluid. In general engineering, it is necessary to control the fluid, most of which are the traditional electromagnetic torque motor driven control valve. This kind of valve has complex structure, large volume and low control precision, so it is difficult to satisfy the precise control of micro-flow fluid. In particular, the precise control of micro-flow fluids under high pressure. In this paper, a new kind of piezoelectric precise flow valve is designed by using piezoelectric ceramic as driving element and metal rubber material. Because piezoelectric ceramics have micro / nanometer precision displacement output ability, piezoelectric drive precision flow valve can use its high displacement resolution to control the opening of valve core, thus realizing precise flow output control. The metal rubber is installed at the inlet and outlet of the valve, and the pressure difference before and after the valve is reduced by using its throttling and decompression characteristics, and the fluid velocity in the valve changes slowly and the cavitation damage is reduced. The valve designed in this paper uses the flexible hinge lever mechanism as the power transmission device and displacement amplifying device between the power source and the movement mechanism of the valve core. The static and dynamic characteristics of the flexible hinge lever mechanism are analyzed by finite element analysis software, and the static deformation cloud diagram and Von Mises stress cloud diagram of the mechanism are obtained. According to the analysis results, the parameters of the flexible hinge lever mechanism are optimized. The optimization results show that the volume of the flexure hinge is 16 times less than that before the optimization when the mechanism meets the good dynamic characteristics of the valve core movement. The lightweight target of flexible hinge lever mechanism is realized. In addition, based on the finite element software platform, a parameterized finite element model of the valve core and its surrounding flow field is established, and the fluid-solid coupling analysis is carried out. Firstly, the flow field in the fluid domain is analyzed. The distribution law of internal fluid pressure field is obtained, and then the fluid analysis results are introduced into the static analysis of the valve core solid field, and the valve core solid field is analyzed statically. The static deformation cloud diagram and Von Mises stress cloud diagram of the valve core under fluid-solid coupling are obtained. According to the results of fluid-solid coupling analysis, the structural parameters of the valve core are optimized. After optimization, under the condition of ensuring the reliability of the spool, the volume of the spool is reduced by 13.5and the weight of the spool is realized.
【学位授予单位】：南昌大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TH137.52

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