共查询到19条相似文献,搜索用时 140 毫秒
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为实现较大的驱动力和速度,提出一种新型压电驱动器,研究了驱动器输出性能随压电泵工作腔数、频率的变化规律。制作驱动器,分别进行十腔串联压电泵/五腔压电泵并联、3~5个压电振子工作、50~400 Hz频率下的输出试验。结果表明,压电泵并联时驱动器的最佳输出功率较大;工作的振子数目不同,存在不同的最佳频率使驱动器的输出速度最大,相同的频率使输出推力最大;最佳频率时,驱动器的输出与工作的振子数目呈正比。在150V、380Hz时驱动器输出功率最大,此时输出速度和推力是10.72mm/s、57.7N。 相似文献
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为进一步拓展压电微泵的应用领域,以利于更好地将其集成于微流控芯片中,该文对以固态聚二甲基硅氧烷(PDMS)为泵体材料的压电微泵开展相关实验研究。通过合理设计压电振子的支承方式、阀片结构以及采用两腔串、并联结构等措施以提高压电微泵的工作性能。分别以PDMS和聚甲基丙烯酸甲酯(PMMA)为泵体材料设计制作了单腔微泵、双腔串、并联微泵,并对其工作性能进行对比性实验测试。实验证明,构造具有较好工作性能的PDMS压电微泵具有可行性,在电压90 V,频率80 Hz的情况下,PDMS双腔串联泵的输出流量达到21mL/min,输出压力达到10kPa。但与PMMA为泵体材料的压电微泵相比,PDMS压电微泵在流量、压力方面仍有近30%的差距。 相似文献
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为了减小压电泵的体积以便可在新的领域中使用,该文设计了一种新型压电泵。对该型压电泵的驱动原理、机械结构、制造方法和机械性能等进行了研究。首先说明了单腔单压电振子泵的工作原理;接着提出了新型的金属单向阀,这种单向阀为整体开启式,可有效提高阀的使用寿命;然后讨论了该压电泵中组件的加工方法和装配后的整机尺寸的大小;最后介绍了该压电泵在医用胰岛素推注方面的应用。实验结果表明,新型的压电泵可承受背压为30 kPa,泵的整体尺寸为17 mm×20 mm×5 mm,推注液体精度可达到1.2μL。设计制作的整体开启式单向阀的性能稳定可靠、能承受较高背压,该型压电泵具有推注压力高、流量稳定等特点。 相似文献
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压电微泵的泵出流量由微泵结构、压电振子特性及驱动系统驱动信号的形式决定。在机械结构及材料特性确定的条件下,压电振子的驱动信号决定着微泵输出微流量的可靠性和稳定性。在分析压电微泵驱动基理的基础上,通过Ansys对驱动压电振子有效振动的一、二阶频率进行有限元模拟分析,确定了驱动信号电压幅值、频率对微泵流量的影响。以此为基础搭建压电微泵流量测试实验平台,在相同电压和频率条件下,研究了3种不同脉冲信号(正弦波、三角波、矩形波)对输出流量的影响。通过实验对理论模型进行修正,得到了压电微泵输出流量简化模型。实验验证了所得模型在正弦波、三角波、矩形波3种不同波形驱动下最大误差不超过4%,控制范围内可靠性在99.0%以上。综合比较可知,方波脉冲信号为压电微泵最佳驱动信号。 相似文献
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Area-efficient CMOS charge pumps for LCD drivers 总被引:1,自引:0,他引:1
TianRui Ying Wing-Hung Ki Mansun Chan 《Solid-State Circuits, IEEE Journal of》2003,38(10):1721-1725
Area-efficient 4/spl times/ charge pumps based on the cross-coupled structure that uses the V/sub dd/-2V/sub dd/ outputs alternately to reduce the number of power devices and capacitors are presented. Compared with conventional designs, our best design can save two power transistors, one capacitor, and two level shift circuits. An integrated 4/spl times/ charge pump is then designed to deliver 100 /spl mu/A at 9 V using a 0.8-/spl mu/m AMS high-voltage CMOS process. The topology can be extended to 2n/spl times/ charge pumps, and a 6/spl times/ charge pump is also fabricated and tested to demonstrate the validity of the extension. 相似文献
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为了探究泵腔结构参数对压电气体隔膜泵性能的影响,该文设计了一种压电气体隔膜泵的泵腔结构。首先简述了泵腔的结构设计与工作原理,推导出泵腔出口气流速度的表达式,通过仿真得出泵腔高度、气孔直径对腔体内的瞬时气压、气流速度及气体流量的影响。最后制作了泵腔样机并应用在压电气体隔膜泵中,进行了实验测试及理论分析对比。结果表明,实验结果与理论分析相吻合,输出流量随着腔高的增大而减小,随着气孔直径的增大而增大,这为压电气体微泵的腔体设计提供了理论参考。 相似文献
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一种医用微型同心压电薄膜泵 总被引:1,自引:0,他引:1
设计开发了一种结构新颖,制作工艺简单,成本低,综合性能高的烈性药物输注用压电薄膜微型泵,介绍了微泵的结构设计、工作原理和性能测试。微泵具有在出口和入口两个方向上抵抗冲击载荷的能力和互锁的功能,适合于对外界环境要求苛刻的烈性药物输注。微泵不论液体还是气体为工作介质都具有良好的流量特性和较高的可靠性。同心双向阀结构克服了传统的单向阀并联结构两阀间易连通的缺点。高分子聚合物材料和特殊的加工装配工艺使得微泵即使在小批量单件生产的情况下成本依然低廉。因此,该种微泵更加接近实用化,具有广阔的应用前景。 相似文献
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Oliver Pabst Jolke Perelaer Erik Beckert Ulrich S. Schubert Ramona Eberhardt Andreas Tünnermann 《Organic Electronics》2013,14(12):3423-3429
Digital printing technologies are promising as future manufacturing approaches due to their capabilities of highly flexible and additive material deposition on various substrates. In this contribution, all inkjet-printed piezoelectric polymer actuators are presented based on polyvinylidene fluoride trifluoroethylene (P(VDF-TrFE)) and electrodes printed from silver nanoparticle dispersions. The target application for the actuators described here are membrane pumps for microfluidic lab-on-a-chip (LOC) systems. For the first time, all-inkjet-printed P(VDF-TrFE) actuators are reported and the corresponding piezoelectric d31 coefficient is measured. For manufacturing the actuators, a low-cost procedure is employed that consists of only three inkjet printing and post-processing steps where moderate thermal treatments (Tmax = 130 °C) are combined with plasma sintering. The processing is therefore compatible with a wide range of temperature sensitive polymer substrates, completely additive and highly flexible. A sandwich-like structure of a piezoelectric P(VDF-TrFE) layer between two silver electrodes is inkjet-printed onto a polyethylene terephthalate (PET) substrate. When a voltage is applied across the piezoelectric layer, the reverse piezoelectric effect will lead to a bending deflection of this unimorph structure. The piezoelectric d31 coefficients are found to be approximately 7 to 9 pm V−1, which allows the generation of significant actuator deflections. For the application in a micropump, flow rates of several 100 μL min−1 are anticipated, which is promising for LOC applications. Most current micropumps are based on actuator elements that are fabricated separately and mounted on a passive membrane. By using all inkjet-printed actuators, as presented here, the joining step is avoided and the benefits of low-cost printed devices are added to the well-developed processing approaches for microfluidic chips. 相似文献
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Accuracy of drug infusion pumps under computer control 总被引:4,自引:0,他引:4
Prototype systems implementing algorithms for automated drug infusions are typically constructed by coupling a microcomputer to a drug infusion pump through a serial communications interface. Infusion rates demanded of the infusion pump in many computed-controlled drug delivery applications are made to change at intervals much shorter than those encountered under routine clinical use. Because the ability of infusion pumps to maintain accurate flow rates during high frequency rate changes has not been documented, the purpose of this study was to validate the volumetric accuracy of three commercially available infusion pumps operating in a demanding computer-controlled application. In independent 2-h evaluations, the infusion rate demanded of each pump changed as often as every 5, 10, or 15 s using an algorithm for computer-controlled pharmacokinetic model-driven intravenous infusion. Accuracy of the infusion devices was determined gravimetrically. At all measurement times, each of the infusion pumps was accurate to within approximately +/- 5% of the expected volumetric output under each of the infusion rate intervals tested. Flow rate accuracy of +/- 5% is equal to the nominal expected accuracy of these infusion pumps in conventional clinical use. 相似文献