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微型泵和微型阀的进展 总被引:11,自引:0,他引:11
微型泵、阀及微量流体控制系统由于其广泛的应用前景,成为微型机械研究中一活跃的分支。本文着重介绍微型泵、阀的研究现状,论述微型泵、阀的结构设计,致动原理及其实现性能等。 相似文献
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针对微型泵参数单独优化存在的不精确性,提出了一种将有限元、粗糙集理论、多元回归分析及遗传算法相结合的综合优化设计新方法。采用有限元方法对大量虚拟微型泵的设计实例进行了多能量域耦合场动态特性分析,获取信息数据;采用粗糙集理论和遗传算法对获得的信息进行了数据挖掘,确定影响微型泵性能的关键属性。以获取的信息数据和关键属性为依据,采用多元回归方法建立了综合优化设计模型。基于以上方法,对相应原型软件进行了开发,并利用该软件对热驱动微型泵进行了综合优化设计,优化后的热驱动微型泵的效率得到了明显的提高。研究结果表明,该方法和原型软件具有可行性,可以应用于其他微器件的综合优化设计。 相似文献
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根据微型轴流式血泵外磁驱动装置的重要组成部分——永磁体的自身特性,基于ANSYS软件建立了有限元模型,合理分析了其所受的载荷和边界奈件,得出了较为准确的分析结论,为整个装置的正常运行提供了可靠的理论依据。 相似文献
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为了揭示微小齿轮泵的几何参数与其工作性能之间的关系,利用Fluent动网格技术,对汽车尾气处理装置中微小齿轮泵进行二维数值模拟分析,探究顶隙、齿轮齿数等几何参数对微小齿轮泵流量和精度的影响规律。结果表明,在其他条件相同时,随着顶隙增大,平均流量逐渐变小,流量脉动率逐渐增大,顶隙由0.02 mm变化为0.3 mm时,平均流量减小约33%,流量脉动率增大约18%,精度降低;随着齿轮齿数增大,流量和流量脉动率均减小,齿轮齿数由14增大到28时,平均流量减小约54%,流量脉动率减小约95%,精度逐渐提高,齿轮齿数对流量脉动率的影响幅度明显高于对流量的影响效果。 相似文献
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MA Ji'en XU Bing ZHANG Bin YANG Huayong 《机械工程学报(英文版)》2010,23(1):45-52
The flow ripple, which is the source of noise in an axial piston pump, is widely studied today with the computational fluid dynamic(CFD) technology development. In the traditional CFD modeling, the fluid compressibility, which strongly influences the accuracy of the flow ripple simulation results, is often neglected. So a compressible sub-model was added with user defined function(UDF) in the CFD model to predict the flow ripple. At the same time, a test rig of flow ripple was built to study the validity of simulation. The flow ripple of pump was tested with different working parameters, including the rotation speed and the working pressure. The comparisons with experimental results show that the validity of the CFD model with compressible hydraulic oil is acceptable in analyzing the flow ripple characteristics. In this paper, the improved CFD model increases the accuracy of flow ripple rate to about one-magnitude order. Therefore, the compressible model of hydraulic oil is necessary in the flow ripple investigation of CFD simulation. The compressibility of hydraulic oil has significant effect on flow ripple, and the compression ripple takes about 88% of the total flow ripple of pump. Leakage ripple has the lowest proportion of about 4%, and geometrical ripple leakage ripple takes the remnant 8%. Besides, the influence of working parameters was investigated through the CFD simulations and experimental measurements. Comparison results show that the amplitude of flow ripple grows with the increasing of rotation speed and working pressure, and the flow ripple rate is independent of the rotation speed. However, flow ripple rate of piston pump grows with the increasing of working pressure, because the leakage ripple will increase with the pressure growing. The investigation on flow ripple of an axial piston pump using compressible hydraulic oil provides a more validity simulation model for the CFD analyzing and is beneficial to further understanding of the flow ripple characteristics in an axial piston pump. 相似文献
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为了提高微型泵输出流量以及获得连续出流能力,设计了一种基于合成射流原理的无阀气体压电泵。首先,分析了压电气泵的工作原理,测试了压电振子的振幅;其次,利用CFX软件对无阀气泵进行仿真分析,得到压电气泵在0T,1/4T,2/4T和3/4T时刻的气体流速分布,以及容腔高度、泵腔高度、射流孔直径和出口直径对气泵流量的影响规律;最后,制作了无阀气体压电泵的实验样机。测试结果表明,当无阀压电气泵在驱动电压为120V、驱动频率为400Hz、容腔高度为0.1mm、泵腔高度为1.4mm、射流孔直径为1.3mm和出口直径为2mm时,泵输出气体流量为1800ml/min左右,实验与仿真分析基本吻合。该气泵能输出较大气体流量并具有连续出流的能力。 相似文献
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基于现有无阀压电泵输送活体细胞或者长链功能性高分子时依然存在输送破坏与缠绕失性等缺点,提出了一种流线形流管无阀压电泵,研究了4组不同角度的流线形流管无阀压电泵的输出性能.首先,阐述了泵的结构及工作原理,建立泵的流量表达式;其次,采用Fluent流体分析软件对β角度分别为10°,15°,20°和25°的流管组成的无阀压电... 相似文献