缠绕垫片外环发生翘曲的原因分析

发布时间：2018-11-19 13:46

【摘要】：缠绕式垫片是一种使用优良的复合材料制造的密封件，由一定几何截面的成型钢带与非金属带交替缠绕而成，因其良好的密封性能，在石化、电力等部门的设备和管道连接密封中得以广泛应用。V型缠绕式垫片具有良好的性能，钢带的角度对缠绕式垫片的性能有显著的影响。缠绕式垫片按结构分为4种：基本型、带内环、带外环、带内外环，在带外环和内外环应用的设备上经常会发现外环翘曲现象，且泄漏常常发生在这些翘曲的垫片上。本文对缠绕式垫片外环发生翘曲的原因进行了理论分析与数值模拟，给出了合理的加工误差尺寸，建立了缠绕式垫片外环V型槽不对称情况下外环的受力模型并进行受力分析和弯矩作用下的强度计算，通过理论计算，证明缠绕式垫片外环V型槽不对称时，存在一个弯矩，，使缠绕式垫片外环发生翘曲，从而减小对缠绕式垫片本体的回弹作用，影响缠绕式垫片的密封性能，这是外环翘曲缠绕式垫片容易产生泄漏的主要原因；根据材料的许用应力求出临界弯矩和临界偏移量，以及在临界弯矩下外环的最大挠度，同时运用有限元对外环的变形进行模拟，仿真得出的结果与理论计算结果基本一致，验证了理论计算的准确性，本文的分析计算对缠绕式垫片的生产及其标准制定具有指导意义。
[Abstract]:Winding gasket is a kind of seal made of fine composite material. It is made of formed steel strip with certain geometric section and non-metal strip alternately wound, because of its good sealing performance, in petrochemical, The V winding gasket has good performance and the angle of steel strip has a significant influence on the performance of the winding gasket. The winding gasket is divided into four types according to its structure: basic type, inner ring, outer ring and outer ring. The phenomenon of outer ring warping is often found in the equipment with outer ring and outer ring, and the leakage often occurs on these warped gaskets. In this paper, the causes of warpage in the outer ring of winding gasket are analyzed theoretically and numerically simulated, and the reasonable machining error size is given. In this paper, the stress model of the outer ring of the winding gasket outer ring under the condition of asymmetric V-groove is established, and the force analysis and the strength calculation under the action of bending moment are carried out. Through theoretical calculation, it is proved that there exists a bending moment when the V-shaped slot of the outer ring of the winding gasket is asymmetrical. Warpage occurs in the outer ring of the winding gasket, which reduces the springback effect on the body of the wound gasket and affects the sealing performance of the winding gasket, which is the main reason for the leakage of the warp-wound gasket of the outer ring. According to the allowable use of the material, the critical moment and the critical deviation, and the maximum deflection of the outer ring under the critical moment, the deformation of the outer ring is simulated by using finite element method. The simulation results are basically consistent with the theoretical results. The accuracy of the theoretical calculation is verified. The analysis and calculation in this paper is of guiding significance to the production and standard formulation of the winding gasket.
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH136

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