多片叠合节流阀片的设计及应力分析

通过单片节流阀片力学模型,建立弯曲变形微分方程,利用边界条件得到阀片弯曲变形方程解,再借恒等变形得到阀片弯曲变形精确分析计算公式和弯曲变形系数.然后,通过对叠合阀片弯曲变形和最大应力的分析,得到多片叠合节流阀片当量厚度的计算公式及其所受最大应力与单片当量厚度阀片最大应力之间的关系,并定义阀片应力系数和厚度系数.在此基础上给出按设计厚度要求将节流阀片拆分为n片的设计原则.应用上述方法进行实例设计和应力分析,并利用ANSYSY软件进行仿真.对比结果表明,叠合式节流阀片的设计原则、当量厚度和应力计算方法是准确和有效的.

DESIGN AND STRESS ANALYSIS OF THROTTLE MULTI-SLICE

The governing differential equation for bending deformation of a single throttle slice is introduced first, and based on its solution satisfying required boundary conditions, the formula and coefficient for bending deformation of a single slice is obtained through equivalency transformation. Then, by analyzing the bending deformation and maximum stress of throttle multi-slice, the formula for equivalent thickness of the throttle multi-slice and the relationship between its maximum stress and that of single slice are obtained, from which the stress coefficient and the thickness coefficient of slice are defined. Based on these results a new scheme for designing an throttle n-slice according to its nominal thickness is suggested. Followed is a practical example for design and stress analysis of a multi-slice throttle, together with it, numerical simulation by ANSYSY. The compared results show that the design scheme is effective and the formulas for equivalent thickness and maximum stress of the throttle multi-slice are accurate enough.