發(fā)布時間：2018-08-06 07:59

【摘要】：壓電泵是利用壓電晶體的逆壓電效應(yīng)實現(xiàn)流體輸送的一種新型流體輸送裝置。由于具有結(jié)構(gòu)簡單、體積小、無電磁干擾、控制容易、驅(qū)動功率小等優(yōu)點,因此它在生物工程、醫(yī)療、化學(xué)分析以及汽車發(fā)動機燃料供給等領(lǐng)域具有廣泛的應(yīng)用前景。 目前傳統(tǒng)的壓電泵已經(jīng)取得了長足的進步,在輸出流量、輸出壓力、輸出精度等方面均能滿足一定的使用要求。但在某些需要輸送氣體及大粘度流體的場合,性能還較弱,應(yīng)用受到較多的限制。其主要原因為,傳統(tǒng)壓電泵在輸送氣體時容易形成振子過熱,導(dǎo)致過早失效,且輸出流量較低等,在輸送大粘度流體時輸送性能也很差等。由此,本文提出以共振放大方式構(gòu)造共振型壓電泵。經(jīng)研究,此種結(jié)構(gòu)的泵具有較大的腔體體積變化量及壓縮比,能較好的解決傳統(tǒng)壓電泵存在的問題。 本文提出以片式環(huán)形壓電振子作為激勵源,以激振體的形式向壓電泵提供動力,與由柱塞式膜片與單向閥構(gòu)成的泵體部分組成了共振型壓電泵。通過理論分析和試驗測試的方式對共振型壓電泵進行了系統(tǒng)的研究。綜合分析了壓電振子撓度、激振體諧振頻率及振動幅值比、膜片撓度和泵的輸出流量的變化規(guī)律。在此基礎(chǔ)上,通過正交試驗,優(yōu)化了共振型壓電泵系統(tǒng)的結(jié)構(gòu)參數(shù)。測試了共振型壓電泵輸出流量的頻率和電壓特性。為設(shè)計高性能的共振型壓電泵提供了理論依據(jù)。 壓電振子是共振型壓電泵的激勵元件,也是核心部件。本文利用解析法求解了固定支撐邊界條件下環(huán)形壓電振子的撓度。在此基礎(chǔ)上,通過試驗測試了壓電振子的撓度與驅(qū)動信號之間的影響關(guān)系,給出了泵用壓電振子結(jié)構(gòu)參數(shù)的選取方法。 激振體是由壓電振子與彈簧質(zhì)量系統(tǒng)構(gòu)成,它作為共振型壓電泵的動力部件,所提供的振動位移及輸出力將直接作用到膜片以驅(qū)動流體。文中首先介紹了激振體的工作原理,建立了激振體的振動力學(xué)模型,根據(jù)振動分析原理、板殼理論等相關(guān)知識,求解了其諧振頻率、振動幅值比公式。通過數(shù)值分析及試驗測試,分析了激振體的諧振頻率、振動幅值比和振動位移與激振體結(jié)構(gòu)參數(shù)的影響關(guān)系。 泵體部分是指共振型壓電泵中直接作用于流體的組成部分。針對泵體部分,建立了膜片的振動模型,分析了膜片直徑和剛性圓片直徑對膜片撓度和泵的輸出流量的影響規(guī)律。討論了截止閥、腔體高度和氣穴現(xiàn)象與共振型壓電泵輸送性能的影響關(guān)系。通過試驗測試了各結(jié)構(gòu)參數(shù)對共振型壓電泵輸出流量的影響關(guān)系,為大流量共振型壓電泵設(shè)計提供指導(dǎo)。 為了進一步了解結(jié)構(gòu)參數(shù)對泵輸送性能的影響,對共振型壓電泵進行了四因素三水平的正交試驗,通過極差法對試驗結(jié)果進行了分析,以輸出最大流量為目標,得出了共振型壓電泵影響因素的主次及因素水平的最佳組合,并對最佳結(jié)構(gòu)組合下的共振型壓電泵的輸出流量與頻率和電壓的關(guān)系進行了測試。測試結(jié)果表明共振型壓電泵在輸送氣體時表現(xiàn)出了較優(yōu)異的性能。
[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.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2011
【分類號】：TH38

【參考文獻】

相關(guān)期刊論文 前1條

1 程院蓮,鮑鴻,李軍,李小亞;壓電陶瓷應(yīng)用研究進展[J];中國測試技術(shù);2005年02期

，

本文編號：2167039