软质锥壳形阀体压电泵的理论和实验研究

发布时间：2018-05-20 11:08

本文选题：压电泵 + 锥壳形单阀体　；参考：《南京航空航天大学》2011年硕士论文

【摘要】：压电泵是随着压电技术的日益成熟并被创造性的应用于流体驱动产生的新型流体驱动器。与传统泵(如齿轮泵或螺杆泵等)相比,压电泵的驱动源采用压电驱动,省去了电动机驱动,故有结构简单、体积小、电磁污染较小、流量控制精确并且能微量输出的优点。基于这些优点压电泵在微小型方向上发展具有明显优势,在小型化、微流量领域如生物工程、医疗、精密化学分析、制药工程等有广泛的应用前景,已经成为国内外学者们研究的热点,使压电泵驱动技术日趋成熟,适用于不同领域的新型压电泵不断出现。现有压电泵尚不能很好的胜任在医疗、卫生、保健等领域输送任务,主要是因为有阀泵阀体开闭的两次撞击效应致使活体细胞死亡率上升而无阀泵的非阀类单向流动部件产生的湍流与涡旋致使长链高分子发生缠绕失效。为了能够同时实现减小阀体开闭撞击效应及增大输出流量和压力,我们提出构建一种利用内外不等锥度的软质锥壳形单阀体结构的新型被动阀压电泵,对相关问题进行了研究。首先,提出了内外不等锥度的软质锥壳形单阀体压电泵的结构实施方案;然后,对内外不等锥度的软质锥壳形阀体进行了对阀体表面挠度随着压力变化而发生变化的理论分析;最后,对内外不等锥度的软质锥壳形单阀体压电泵进行了实验验证。实验表明:在150V峰值电压,500Hz频率下驱动时,内外不等锥度的软质锥壳形单阀体压电泵的进出口压差可达到170mm。并实际测得压差随电压的变化曲线,在一定范围内,压差随施加电压的升高而升高。实验证明了理论分析的正确性与实施方案的可行性。主动阀压电泵控制繁琐,结构复杂,但克服了被动阀阀体滞后性的缺点,为了缓解被动阀阀体的滞后问题,我们提出一种半主动阀压电泵,进行了初步的结构设计材料的选取,加工了样机并进行了初步的研究,获得了较好的输出效果。
[Abstract]:With the development of piezoelectric technology, piezoelectric pump is a new type of fluid driver, which is creatively applied to fluid drive. Compared with the traditional pump (such as gear pump or screw pump), the piezoelectric pump uses piezoelectric driving source, which saves the motor drive, so it has the advantages of simple structure, small volume, less electromagnetic pollution, accurate flow control and micro output. Based on these advantages, piezoelectric pumps have obvious advantages in the development of micro-type, and have wide application prospects in miniaturization and micro-flow fields such as biological engineering, medical treatment, precision chemical analysis, pharmaceutical engineering, etc. It has become a hot topic for scholars at home and abroad, which makes the driving technology of piezoelectric pump mature day by day, and the new type of piezoelectric pump suitable for different fields appears constantly. The existing piezoelectric pumps are still not well qualified for transportation tasks in the fields of medical treatment, hygiene, health care, and so on. The main reason is that the two impact effects of valve body opening and closing increase the cell death rate of living body, but the turbulence and vortex produced by non-valve one-way flow components without valve pump cause the winding failure of long chain polymer. In order to reduce the open and close impact effect of valve body and increase the output flow and pressure simultaneously, we propose a new passive valve piezoelectric pump with soft conical shell single body structure with different taper inside and outside. The related problems are studied. Firstly, the structure implementation scheme of soft conical shell single body piezoelectric pump with inner and outer unequal taper is put forward, and then the theoretical analysis of the change of body surface deflection with the change of pressure is carried out for the soft conical shell body with inner and outer unequal taper. Finally, the soft conical shell single body piezoelectric pump with different internal and external taper is verified experimentally. The experimental results show that the inlet and outlet pressure difference of soft conical shell single valve piezoelectric pump with different internal and external taper can reach 170 mm when driven at 150V peak voltage of 500Hz frequency. The curves of voltage difference with voltage are measured. In a certain range, the pressure difference increases with the increase of applied voltage. The experiment proves the correctness of the theoretical analysis and the feasibility of the implementation scheme. The control of the active valve pressure pump is complicated and the structure is complicated, but it overcomes the disadvantage of the hysteresis of the passive valve body. In order to alleviate the hysteresis problem of the passive valve body, we propose a semi-active valve piezoelectric pump, and select the primary structural design material. The prototype was machined and the preliminary research was carried out, and a good output effect was obtained.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH38

【引证文献】