【摘要】：閥門是工業(yè)發(fā)展過程中必須的控制部件,蝶閥由于結(jié)構(gòu)簡單、體積小、啟閉迅速等優(yōu)點(diǎn),被廣泛地用于醫(yī)療、交通、化工、冶金、電力、石油、食品等各種領(lǐng)域。三偏心蝶閥采用錐面為密封面,其使用范圍廣,密封面磨損小,密封性能好,在工業(yè)生產(chǎn)中需求量越來越高,使用的工況也越來越嚴(yán)苛。目前國內(nèi)相對于三偏心蝶閥還缺少合理的設(shè)計(jì)方法,而且傳統(tǒng)的三偏心蝶閥截面是一個(gè)橢圓,密封面面積較大,獲得同樣密封效果所需的力矩也大,并且橢圓密封副安裝對中性差,安裝較繁瑣。本文基于三偏心蝶閥的相關(guān)問題,提出了一種圓截面三偏心蝶閥,分析了其干涉和偏心參數(shù)之間的關(guān)系,開發(fā)了相應(yīng)的干涉檢驗(yàn)軟件,采用有限元分析軟件,對圓截面三偏心蝶閥進(jìn)行了靜力學(xué)分析和流體力學(xué)分析。具體工作如下:(1)本文詳細(xì)介紹了三偏心密封形式的結(jié)構(gòu)特點(diǎn),推導(dǎo)出了閥板的截面方程以及密封面的曲面方程。針對傳統(tǒng)三偏心蝶閥的缺點(diǎn),提出了圓截面三偏心蝶閥,并給出了圓截面三偏心蝶閥密封表面的理論方程,然后討論了圓截面三偏心蝶閥偏心參數(shù)之間的關(guān)系和設(shè)計(jì)方法。(2)研究了蝶閥的力學(xué)性能,給出了偏心蝶閥開啟和關(guān)閉過程中所需力矩的計(jì)算公式,針對圓截面三偏心蝶閥推導(dǎo)了其不平衡力矩的計(jì)算公式。(3)詳細(xì)分析了三偏心蝶閥啟閉過程中的干涉原理,推導(dǎo)了回轉(zhuǎn)中心的理論區(qū)域和范圍,提出了一種干涉檢驗(yàn)方法,并基于MATLAB軟件開發(fā)了圓截面三偏心蝶閥干涉檢驗(yàn)軟件。(4)采用Solidworks軟件設(shè)計(jì)了公稱直徑DN=300mm圓截面三偏心蝶閥的三維數(shù)模,基于ANSYS Workbench平臺,對模型進(jìn)行了有限元分析和CFD仿真,得到了閥門的力學(xué)特性和流動規(guī)律。
[Abstract]:Valve is a necessary control component in the process of industrial development. Butterfly valve is widely used in medical treatment, transportation, chemical industry, metallurgy, electricity, petroleum, food and other fields due to its simple structure, small size and quick opening and closing. The triple eccentric butterfly valve adopts cone surface as the sealing surface, it has wide application range, small wear and tear of sealing surface, good sealing performance, the demand in industrial production is higher and higher, and the working conditions used are more and more stringent. At present, relative to the three eccentric butterfly valve in our country, there is still lack of reasonable design method, and the traditional three eccentric butterfly valve section is an ellipse, the sealing surface area is larger, and the moment required to obtain the same sealing effect is also large. And ellipse seal pair installation to neutral difference, installation is more cumbersome. Based on the related problems of triple eccentric butterfly valve, this paper puts forward a kind of circular cross section triple eccentric butterfly valve, analyzes the relationship between interference and eccentricity parameters, develops the corresponding interference checking software, and adopts the finite element analysis software. The static analysis and fluid mechanics analysis of the three eccentric butterfly valve with circular cross section are carried out. The concrete work is as follows: (1) in this paper, the structural characteristics of the triple eccentric seal are introduced in detail, and the cross-section equation of the valve plate and the surface equation of the sealing surface are derived. In view of the shortcomings of the traditional triple eccentric butterfly valve, the circular cross section triple eccentric butterfly valve is put forward, and the theoretical equation of the sealing surface of the circular cross section triple eccentric butterfly valve is given. Secondly, the relationship between the eccentric parameters of the three eccentric butterfly valve with circular section and the design method are discussed. (2) the mechanical properties of the butterfly valve are studied, and the formulas for calculating the torque required in the process of opening and closing of the eccentric butterfly valve are given. The formula for calculating the unbalanced moment of the three eccentric butterfly valve with circular cross section is derived. (3) the interference principle in the process of opening and closing of the three eccentric butterfly valve is analyzed in detail, the theoretical region and range of the center of rotation are deduced, and an interference checking method is put forward. Based on MATLAB software, the interference test software of three eccentricity butterfly valve with circular section is developed. (4) the three-dimensional digital model of three eccentric butterfly valve with nominal diameter DN=300mm is designed by using Solidworks software. Based on ANSYS Workbench platform, the finite element analysis and CFD simulation of the model are carried out. The mechanical characteristics and flow law of the valve are obtained.
【學(xué)位授予單位】：西華大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TH134

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