差速浮动式传输密封的关键技术研究

发布时间：2018-04-10 12:24

本文选题：传输密封 + 差速浮动　；参考：《西华大学》2012年硕士论文

【摘要】：差速浮动式传输密封是一种新型的接触式轴端机械密封。本文根据查阅相关文献，结合传输密封使用工况要求，利用摩擦学和机械制造工艺相关知识对差速浮动式传输密封的差速浮动特性及其影响因素进行分析；根据流体动静压润滑理论，结合传输密封密封间隙的结构特点对密封的性能参数进行了求解。根据实地调研测绘，对差速浮动式传输密封进行实体建模，给出了传输密封使用工况参数。结合液压系统传动特点，通过流体在流动时的压力损失计算，对传输密封的主要零部件结构参数进行优化，对螺钉进行布置、选型和强度校核。结合国内外表面粗糙度对密封性能影响的研究现状，利用“平均流动模型”对密封端面表面粗糙度进行数值模拟分析和波纹度分析，说明它们对密封性能的影响特征；并通过差速浮动式传输密封结构特点和加工工艺分析，给出了密封副材料的选择和热处理工艺。根据流体连续性方程、动量守恒方程，，通过N-S方程在柱坐标系下的雷诺方程推导，得出密封间隙中的控制方程，建立传输密封流体模型。利用泛函求极值和有限元法给出控制方程的离散形式，通过ANSYS流体分析模块FLOTRAN CFD进行求解，并将求解结果与理论计算结果进行对比，验证了数值模拟结果的正确性。另外，通过对密封参数的图表分析，说明转速、压力和间隙等参数对密封性能的影响。根据金属的腐蚀形式，结合传输密封使用特殊环境，分析了传输密封主要腐蚀失效形式和腐蚀机理，并提出相应的防护措施。
[Abstract]:Differential floating transmission seal is a new type of contact shaft end mechanical seal.In this paper, the differential floating characteristics of differential floating transmission seal and its influencing factors are analyzed by means of tribology and mechanical manufacturing technology.According to the hydrostatic and hydrostatic lubrication theory, the performance parameters of the seal are solved according to the structural characteristics of the transmission seal clearance.According to field survey and mapping, the model of differential floating transmission seal is established, and the operating condition parameters of transmission seal are given.According to the transmission characteristics of hydraulic system, the structural parameters of the main parts of the transmission seal are optimized by calculating the pressure loss of the fluid during the flow, and the screws are arranged, selected and the strength checked.Combined with the research status of the effect of surface roughness on seal performance at home and abroad, the numerical simulation and corrugation analysis of the surface roughness of seal end face are carried out by using the "average flow model", which shows the characteristics of their influence on the seal performance.The selection of sealing materials and heat treatment process are given by analyzing the structure characteristics and processing technology of differential floating transmission seal.According to the fluid continuity equation, momentum conservation equation and Reynolds equation of N-S equation in cylindrical coordinate system, the governing equation in sealing clearance is obtained, and the transmission seal fluid model is established.The discrete form of control equation is given by using functional method and finite element method, and solved by ANSYS fluid analysis module FLOTRAN CFD. The results are compared with the theoretical results, and the correctness of the numerical simulation results is verified.In addition, the effects of speed, pressure and clearance on sealing performance are illustrated by graphic analysis of sealing parameters.According to the corrosion form of metal and the special environment of transmission seal, the main corrosion failure forms and corrosion mechanism of transmission seal are analyzed, and the corresponding protective measures are put forward.
【学位授予单位】：西华大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH136

【引证文献】