共振型压电泵的设计理论与试验研究
发布时间：2018-08-06 07:59
【摘要】：压电泵是利用压电晶体的逆压电效应实现流体输送的一种新型流体输送装置。由于具有结构简单、体积小、无电磁干扰、控制容易、驱动功率小等优点,因此它在生物工程、医疗、化学分析以及汽车发动机燃料供给等领域具有广泛的应用前景。 目前传统的压电泵已经取得了长足的进步,在输出流量、输出压力、输出精度等方面均能满足一定的使用要求。但在某些需要输送气体及大粘度流体的场合,性能还较弱,应用受到较多的限制。其主要原因为,传统压电泵在输送气体时容易形成振子过热,导致过早失效,且输出流量较低等,在输送大粘度流体时输送性能也很差等。由此,本文提出以共振放大方式构造共振型压电泵。经研究,此种结构的泵具有较大的腔体体积变化量及压缩比,能较好的解决传统压电泵存在的问题。 本文提出以片式环形压电振子作为激励源,以激振体的形式向压电泵提供动力,与由柱塞式膜片与单向阀构成的泵体部分组成了共振型压电泵。通过理论分析和试验测试的方式对共振型压电泵进行了系统的研究。综合分析了压电振子挠度、激振体谐振频率及振动幅值比、膜片挠度和泵的输出流量的变化规律。在此基础上,通过正交试验,优化了共振型压电泵系统的结构参数。测试了共振型压电泵输出流量的频率和电压特性。为设计高性能的共振型压电泵提供了理论依据。 压电振子是共振型压电泵的激励元件,也是核心部件。本文利用解析法求解了固定支撑边界条件下环形压电振子的挠度。在此基础上,通过试验测试了压电振子的挠度与驱动信号之间的影响关系,给出了泵用压电振子结构参数的选取方法。 激振体是由压电振子与弹簧质量系统构成,它作为共振型压电泵的动力部件,所提供的振动位移及输出力将直接作用到膜片以驱动流体。文中首先介绍了激振体的工作原理,建立了激振体的振动力学模型,根据振动分析原理、板壳理论等相关知识,求解了其谐振频率、振动幅值比公式。通过数值分析及试验测试,分析了激振体的谐振频率、振动幅值比和振动位移与激振体结构参数的影响关系。 泵体部分是指共振型压电泵中直接作用于流体的组成部分。针对泵体部分,建立了膜片的振动模型,分析了膜片直径和刚性圆片直径对膜片挠度和泵的输出流量的影响规律。讨论了截止阀、腔体高度和气穴现象与共振型压电泵输送性能的影响关系。通过试验测试了各结构参数对共振型压电泵输出流量的影响关系,为大流量共振型压电泵设计提供指导。 为了进一步了解结构参数对泵输送性能的影响,对共振型压电泵进行了四因素三水平的正交试验,通过极差法对试验结果进行了分析,以输出最大流量为目标,得出了共振型压电泵影响因素的主次及因素水平的最佳组合,并对最佳结构组合下的共振型压电泵的输出流量与频率和电压的关系进行了测试。测试结果表明共振型压电泵在输送气体时表现出了较优异的性能。
[Abstract]:A piezoelectric pump is a new type of fluid conveying device which uses the reverse piezoelectric effect of the piezoelectric crystal to carry out the fluid transportation. It has the advantages of simple structure, small volume, no electromagnetic interference, easy control and small driving power, so it has a wide application in the fields of biological engineering, medical treatment, chemical analysis and fuel supply of automobile engine. View.
At present, the traditional piezoelectric pump has made great progress, which can meet certain requirements in the output flow, output pressure and output precision. But in some situations where gas and large viscosity fluid are needed, the performance is weak and the application is limited. The main reason is that the traditional piezoelectric pump is easy to transport gas. When the oscillator is overheated, it causes premature failure, and the output flow is low, and the transport performance is very poor when transporting large viscosity fluid. Therefore, the resonance type piezoelectric pump is constructed by resonance amplification. It is studied that the pump of this structure has a larger volume change and compression ratio, and can better solve the existence of the traditional piezoelectric pump. Problem.
In this paper, a circular piezoelectric vibrator is used as an exciting source and a vibrator is used to supply power to a piezoelectric pump. A resonant piezoelectric pump is composed of a piston type diaphragm and a one-way valve. The resonant piezoelectric pump is systematically studied through theoretical analysis and test test. The piezoelectric vibrator is synthetically analyzed. On the basis of the orthogonal test, the structural parameters of the resonant piezoelectric pump system are optimized by orthogonal test. The frequency and voltage characteristics of the output flow of the resonant piezoelectric pump are tested. The theory provides a theory for the design of high performance resonant piezoelectric pump. Basis.
The piezoelectric vibrator is the excitation element and the core component of the resonant piezoelectric pump. In this paper, the deflection of the ring piezoelectric vibrator under the fixed support boundary condition is solved by the analytical method. On this basis, the relationship between the deflection of the piezoelectric vibrator and the driving signal is tested and the selection of the structure parameters of the piezoelectric vibrator is given. Law.
The vibrator is made up of a piezoelectric vibrator and a spring mass system. As the dynamic component of a resonant piezoelectric pump, the vibration displacement and output force provided by the vibrator will directly affect the diaphragm to drive the fluid. First, the working principle of the vibrator is introduced, and the vibration mechanics model of the vibrator is set up, and the theory of vibration analysis and the theory of the plate and shell are used. The resonant frequency and amplitude ratio of vibration are solved by means of related knowledge. Through numerical analysis and test test, the relationship between the resonant frequency of the vibrator, the amplitude ratio of vibration and the influence of the vibration displacement on the structural parameters of the excited vibrator is analyzed.
The pump body part refers to the component of the fluid in a resonant piezoelectric pump. According to the part of the pump, the vibration model of the diaphragm is established. The influence of the diameter of the diaphragm and the diameter of the rigid disc on the deflection of the diaphragm and the output flow of the pump is analyzed. The cut-off valve, the cavity height and cavitation phenomenon and the conveying performance of the resonant type piezoelectric pump are discussed. The influence of structure parameters on the output flow of resonant piezoelectric pump is tested by experiment, which provides guidance for the design of resonant piezoelectric pump with large flow.
In order to further understand the effect of structural parameters on the pump performance, the orthogonal test of four factors and three levels is carried out on the resonant piezoelectric pump. The test results are analyzed by the extreme difference method. The optimum combination of the main factors and factors of the resonance type piezoelectric pump is obtained, and the optimum structure is obtained. The relationship between the output flow of the resonant piezoelectric pump and the relationship between the frequency and the voltage is tested. The test results show that the resonant piezoelectric pump shows excellent performance when it conveyed the gas.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH38
本文编号：2167038
[Abstract]:A piezoelectric pump is a new type of fluid conveying device which uses the reverse piezoelectric effect of the piezoelectric crystal to carry out the fluid transportation. It has the advantages of simple structure, small volume, no electromagnetic interference, easy control and small driving power, so it has a wide application in the fields of biological engineering, medical treatment, chemical analysis and fuel supply of automobile engine. View.
At present, the traditional piezoelectric pump has made great progress, which can meet certain requirements in the output flow, output pressure and output precision. But in some situations where gas and large viscosity fluid are needed, the performance is weak and the application is limited. The main reason is that the traditional piezoelectric pump is easy to transport gas. When the oscillator is overheated, it causes premature failure, and the output flow is low, and the transport performance is very poor when transporting large viscosity fluid. Therefore, the resonance type piezoelectric pump is constructed by resonance amplification. It is studied that the pump of this structure has a larger volume change and compression ratio, and can better solve the existence of the traditional piezoelectric pump. Problem.
In this paper, a circular piezoelectric vibrator is used as an exciting source and a vibrator is used to supply power to a piezoelectric pump. A resonant piezoelectric pump is composed of a piston type diaphragm and a one-way valve. The resonant piezoelectric pump is systematically studied through theoretical analysis and test test. The piezoelectric vibrator is synthetically analyzed. On the basis of the orthogonal test, the structural parameters of the resonant piezoelectric pump system are optimized by orthogonal test. The frequency and voltage characteristics of the output flow of the resonant piezoelectric pump are tested. The theory provides a theory for the design of high performance resonant piezoelectric pump. Basis.
The piezoelectric vibrator is the excitation element and the core component of the resonant piezoelectric pump. In this paper, the deflection of the ring piezoelectric vibrator under the fixed support boundary condition is solved by the analytical method. On this basis, the relationship between the deflection of the piezoelectric vibrator and the driving signal is tested and the selection of the structure parameters of the piezoelectric vibrator is given. Law.
The vibrator is made up of a piezoelectric vibrator and a spring mass system. As the dynamic component of a resonant piezoelectric pump, the vibration displacement and output force provided by the vibrator will directly affect the diaphragm to drive the fluid. First, the working principle of the vibrator is introduced, and the vibration mechanics model of the vibrator is set up, and the theory of vibration analysis and the theory of the plate and shell are used. The resonant frequency and amplitude ratio of vibration are solved by means of related knowledge. Through numerical analysis and test test, the relationship between the resonant frequency of the vibrator, the amplitude ratio of vibration and the influence of the vibration displacement on the structural parameters of the excited vibrator is analyzed.
The pump body part refers to the component of the fluid in a resonant piezoelectric pump. According to the part of the pump, the vibration model of the diaphragm is established. The influence of the diameter of the diaphragm and the diameter of the rigid disc on the deflection of the diaphragm and the output flow of the pump is analyzed. The cut-off valve, the cavity height and cavitation phenomenon and the conveying performance of the resonant type piezoelectric pump are discussed. The influence of structure parameters on the output flow of resonant piezoelectric pump is tested by experiment, which provides guidance for the design of resonant piezoelectric pump with large flow.
In order to further understand the effect of structural parameters on the pump performance, the orthogonal test of four factors and three levels is carried out on the resonant piezoelectric pump. The test results are analyzed by the extreme difference method. The optimum combination of the main factors and factors of the resonance type piezoelectric pump is obtained, and the optimum structure is obtained. The relationship between the output flow of the resonant piezoelectric pump and the relationship between the frequency and the voltage is tested. The test results show that the resonant piezoelectric pump shows excellent performance when it conveyed the gas.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH38
【参考文献】
相关期刊论文 前1条
1 程院莲,鲍鸿,李军,李小亚;压电陶瓷应用研究进展[J];中国测试技术;2005年02期
，本文编号：2167038
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