蝶形封头的压力容器具有广泛的工程应用。本文将其视为不同厚度的组合 ,采用加权残值法分析了各部分壳件的内力场 ,并计算了极限内压 ,得到一个简单的表达式。文末给出了一个具体算例 Butterfly head pressure vessels have a wide range of engineering applications. In this paper, we consider it as a combination of different thicknesses. We use the weighted residual method to analyze the internal force field of each shell, and calculate the limit internal pressure to get a simple expression. A specific example is given at the end of this article