本文计算了气体经过孔眼进入短管,扩散到以一定抽速被抽的容积中,其压力变化与入口压力、孔眼面积及短管尺寸的函数关系。给出了分子流扩散方程的边界条件,推导出入口压力在线性近似下方程的解。理论计算结果和玻璃B-A规管对管口气压变化的响应实验进行了比较,两者吻合。 This paper calculates the gas into the short tube through the perforation, diffusion to a certain pumping speed pumping capacity, the pressure changes with the inlet pressure, perforation area and the short tube size as a function of. The boundary conditions for the molecular flow diffusion equation are given, and the solution to the inlet pressure under the linear approximation is derived. The theoretical calculation results and glass B-A regulation of the nozzle pressure changes in response to the experiment were compared, the two coincide.