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活塞式压缩机中,以往对活塞杆螺纹的应力计算,只考虑静态的拉压载荷,不能描述活塞杆螺纹在实际的压缩机载荷谱下,其内部各点应力的大小。本文考虑了压缩机的交变载荷和弯距等因素产生的螺纹受力条件,用有限元方法编制了活塞杆螺纹结构的动静态应力分析程序,算出螺纹内部的应力分布以及螺纹底部的应力集中情况。并进行实验,测得的应力值与计算值较接近。因而提出了活塞杆螺纹在制造和安装时应采取的提高可靠性的措施。
Piston compressor, piston rod thread in the past to calculate the stress, only consider the static tensile load, can not describe the piston rod thread in the actual compressor load spectrum, the internal stress at each point size. In this paper, the stress conditions of screw thread produced by factors such as alternating load and bending of the compressor are considered. The dynamic and static stress analysis program of piston rod thread structure is programmed by finite element method to calculate the stress distribution inside the screw thread and the stress concentration at the bottom of the screw thread Happening. And the experiment, the measured stress and calculated values are closer. Therefore, measures to improve the reliability of the piston rod thread should be taken when it is manufactured and installed.