往复式压缩机活塞杆可靠性设计方法研究

基于可靠性设计理论,提出了一种针对往复式压缩机活塞杆的疲劳强度可靠性设计方法。首先,依据热力学与动力学原理,分析了一个循环周期内压缩机传动机构的受力情况;而后,采用传统强度校核方法对活塞杆进行疲劳强度分析,找出造成其疲劳失效的"薄弱环节";然后,根据"薄弱环节"几何尺寸、加工工艺和材料强度等参数的随机性,利用应力-强度干涉模型建立活塞杆的极限状态方程,计算其疲劳强度可靠度。最后,综合考虑各参数对可靠度的影响及控制的难易程度,确定设计参数(尺寸、工艺、材料等信息),为活塞杆的设计提供理论依据。

RESEARCH ON THE METHOD FOR RELIABILITY DESIGN OF PISTON ROD ABOUT RECIPROCATING COMPRESSOR

Based on the theory of reliability design, we propose a fatigue strength reliability design method for reciprocating compressor piston rod. Firstly, the driving mechanism forces of compressor in a cycle are analyzed based on the theory of thermodynamics and kinetics. Furthermore, the traditional strength check method was carried out on the piston rod fatigue strength analysis. We also find out the cause the fatigue failure of the weak link. According to the weak link geometric parameters such as size and strength of materials and processing technology of randomness, stress-strength interference model is used to establish the piston rod of the limit state equation and calculate the fatigue strength reliability. Finally, we provide the theoretical basis for the design of the piston rod, according to the influence of various parameters on the reliability and control, the difficulty of the design parameters, such as size, technology, material information and so on.