液氮泵内缸套有限元强度与疲劳分析  

Finite Element Analysis of the Strength and Fatigue of Inner Cylinder Liner of Liquid Nitrogen Pump

作　　者：莫丽[1] 黄岗[1] 黄崇君[1] 何霞[1] 

机构地区：[1]西南石油大学机电工程学院

出　　处：《石油机械》2012年第9期96-99,共4页China Petroleum Machinery

基　　金：国家科技重大专项"大型油气田及煤层气开发"(2011ZX05037-002)的部分研究内容

摘　　要：对液氮泵内缸套进行有限元强度分析和疲劳寿命分析计算,找到危险位置与应力分布状态,对液氮泵缸体的可靠性评价、指导改进设计和正确使用具有重要意义。为此,采用Solid-works Simulation有限元分析软件,对某76 MPa液氮泵内缸套进行有限元强度和疲劳计算,并分析了吸入压力对强度和疲劳寿命的影响。分析结果表明,对该液氮泵内缸套采用无相贯线设计,有效地避免了相贯线的应力集中,静强度足够,整体疲劳寿命满足设计要求。但内缸套最大应力与最小疲劳寿命均出现在内缸套大端台阶边缘处,根据入口压力与强度和疲劳关系曲线认为,适当提高吸入压力可以有效改善内缸套强度和延长其疲劳寿命。The analysis and calculation of the strength and fatigue life of liquid nitrogen pump＇s inner cylinder liner and determination of the dangerous position and stress distribution are of vital importance to the reliable evaluation of the pump cylinder, guiding the design improvement and the correct use of the cylinder. Therefore, the solidworks simulation finite element software was adopted to make a finite element strength and fatigue analysis of the inner cylinder of some 76 MPa liquid nitrogen pump. The effect of suction pressure on the strength and fatigue life was also analyzed. The analysis shows that the non-intersection line design of the pump liner effectively avoids the stress concentration of intersection line. The static strength is sufficient and the whole fatigue life satisfies the design requirement. But the maximum stress and minimum fatigue life of the liner both appear on the step edge of the bit end of the liner. According to the relation curve of the entrance pressure to strength and fatigue, it is thought that proper improvement of suction pressure can effectively improve the strength and fatigue life of the liner.

关 键 词：液氮泵 内缸套 强度 疲劳寿命 吸入压力 有限元分析 

分 类 号：TE934[石油与天然气工程—石油机械设备]