基于C#.NET三偏心蝶阀干涉分析软件的研究

发布时间：2018-11-06 08:17

【摘要】：自70年代国外发明三偏心金属密封蝶阀以来,由于其具有启闭力矩小、采用斜锥面密封、密封性好、抗磨损、使用寿命长等优点,在工业生产中的中高压流体系统得到了非常广泛的用途。从80年代开始引入我国,到目前为止在国内只有少数厂家能够制造三偏心金属密封蝶阀,但仍然有一些关键技术没有掌握。如具有复杂空间曲面的密封副设计,不仅制造难度大,而且容易干涉,远达不到零摩擦、零泄漏以及快关要求。目前我国蝶阀密封副设计方法以经验参数设计为主,国内还没有关于三偏心蝶阀的结构优化设计软件,许多制造企业都是利用经验数据和相对简化的计算方法确定三偏心蝶阀的基本数据,很难使产品达到不干涉、小扭矩和零泄漏的要求。开发三偏心蝶阀的干涉分析软件,是非常重要的。本文研究了三偏心蝶阀的基本结构,给出了主要的结构参数,如蝶板的厚度计算、轴向偏心距的估算等,推导出了蝶板几个主要截面的几何参数(长轴、短轴)与三个偏心量之间的函数关系,提出了参数优化要求。三偏心蝶阀的运动分析主要是讨论干涉性能的分析,三偏心蝶阀的干涉分析是性能评价中一个很重要的环节。根据蝶阀的密封结构设计和机构的运动关系建立蝶板密封面的三维数学模型,采用C#编写计算机程序对密封面上每个点在蝶板机构开启时的启闭角进行计算,验证蝶板是否与阀体产生干涉,调整三偏心参数,确定三偏心蝶阀最小的径向偏心,为驱动装置的选取提供了依据。本文还对该三偏心蝶阀干涉分析软件进行了验证,通过三偏心蝶阀干涉分析软件优化其设计参数,并根据优化后的设计参数的取值范围计算出轴向偏心、径向偏心、角偏心的最大值和最小值,并在最大值和最小值之间任取两个不连续的点,进行摩擦扭矩的计算,对计算结果进行了对比分析。对比分析的结果表明,优化设计所计算出的摩擦扭矩显著减小,有效的降低操作扭矩,提高使用寿命。通过上述的研究,编写的三偏心蝶阀分析软件具备分析三偏心蝶阀基本结构参数、启闭性能指示角的计算、干涉分析和摩擦力矩计算,使得在该软件指导设计下的三偏心蝶阀蝶板运动无干涉、密封比压分布均匀、摩擦扭矩小,并且提供快捷高效的设计方法。
[Abstract]:Since the invention of three-eccentric metal seal butterfly valve in 1970s, it has the advantages of small opening and closing torque, inclined cone sealing, good sealing, anti-wear, long service life, etc. Medium and high pressure fluid systems in industrial production have been widely used. Since 1980's, only a few domestic manufacturers have been able to manufacture tri-eccentric metal seal butterfly valves, but there are still some key technologies that have not been mastered. If the sealing pair with complex space surface is designed, it is not only difficult to manufacture, but also easy to interfere, which is far from zero friction, zero leakage and fast closing. At present, the design method of butterfly valve seal pair in our country is mainly based on experience parameter design, and there is no software for structural optimization design of three-eccentric butterfly valve in China. Many manufacturing enterprises use the experience data and the relatively simplified calculation method to determine the basic data of the three-eccentric butterfly valve. It is very difficult to make the products meet the requirements of non-interference, small torque and zero leakage. It is very important to develop interference analysis software of three eccentric butterfly valve. In this paper, the basic structure of the three-eccentric butterfly valve is studied, the main structural parameters are given, such as the thickness calculation of the butterfly plate, the estimation of the axial eccentricity and so on, and the geometric parameters of the main section of the butterfly plate (long axis, long axis) are deduced. The function relation between the short axis and the three eccentricities is proposed, and the parameter optimization requirements are put forward. The motion analysis of tri-eccentric butterfly valve is mainly to discuss the analysis of interference performance, and the interference analysis of three-eccentric butterfly valve is a very important link in performance evaluation. According to the seal structure design of butterfly valve and the movement relation of mechanism, the three-dimensional mathematical model of butterfly plate seal surface is established, and the opening and closing angle of each point on the seal surface is calculated by C # program. Whether the butterfly plate interferes with the valve body, adjusts the three eccentricity parameters and determines the minimum radial eccentricity of the three eccentric butterfly valve, which provides the basis for the selection of the drive device. The interference analysis software of the three-eccentricity butterfly valve is verified in this paper. The design parameters are optimized by the three-eccentricity butterfly valve interference analysis software, and the axial eccentricity and radial eccentricity are calculated according to the value range of the optimized design parameters. The maximum and minimum values of angular eccentricity and two discontinuous points between maximum and minimum are taken to calculate the friction torque. The calculated results are compared and analyzed. The results of comparison and analysis show that the friction torque calculated by the optimal design is significantly reduced, the operating torque is effectively reduced, and the service life is increased. Through the above research, the analysis software of tri-eccentric butterfly valve has been developed to analyze the basic structural parameters of the three-eccentric butterfly valve, the calculation of the performance indication angle, interference analysis and friction moment calculation of the three-eccentricity butterfly valve. Under the guidance of the software, there is no interference in the movement of the three eccentric butterfly valve butterfly plate, the seal specific pressure distribution is uniform, the friction torque is small, and the design method is fast and efficient.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH134

【相似文献】