超高压压缩机填料盘过盈配合过盈量设计方法.pdf

第52卷第20期
机械工程
Vo1.52 No20
10月
JOURNAL OF MIECHIANCAL ENGINEERIING
2016
DOI:10.3901/JME.2016.20.178
超高压压缩机填料盘过盈配合过盈量设计方法
雷达李雪红李
任希文
(1.西安交通大学化学工程与技术学院西安710049
2.沈阳远大压缩机股份有限公司沈阳110027
摘要:超高压压缩机是生产低密度聚乙烯的核心装置,其设计和制造还有待研究和完善。填料盘是其关键部件之一,填料
过配合的过徹量是一个重要设计参数,国内还未见成熟的设计方法。为了研究如何确定过倫量,使内盘三向应力始终压缩
和填料整体等效应力最小,建立填料理论模型,对填料的过盈量进行优化分析。理论分析可知填料檔内最大周向应
力在排气压力下为压缩应力时,内盐即获得三向压缩应力状态;随着过盈量的增大,内的最大周向应力逐渐変小并山拉伸
应力转变为压縮应力,而整体最大等效应力先减小再增大。对填料盘实际结构的有限元分析也得到相同的结论。理论分析推
导得到排气力下最大周向应力为时的过量nm以及整体最大等效应力最小时的过催量ら。分析认为过量的设计应
当取6imin和61中较大的值就能满足内益三向压缩应力状态以及整体最大等效应力最小的要求,填料盆的设计可以参考该结
关键词:超高压压缩机:填料褴;过量:有限元分析
中图分类号:TI1458
Design Method of Interference Fit in Packing Cups
percompressors
LEI Da! LI Xuehong LI Yun REN Xiwen?
(1. School of Chcmical Enginccring and Tcchnology, Xi an Jiaotong Univcrsity, Xi an 710049;
2. Shenyang Yuanda Compressor Co, Ltd, Shenyang 110027)
Abstract: A hypercompressor is essential part of low density polyethylene production. Designing and manufacturin
hypercompressors requires further research and improvement. Packing cups are crucial components in hypercompressors. Design of
nterference fit of packing cups is of great importance and lacks a complete method In China. Interference tit is designed with two
purposc which includes to obtain compressive stale or the inner cup and to minimize the cquivalcnl stress o[ ovcrall packing cup. A
simplified model of a packing cup is built Ior thcorclical analysis to determine interference fit. In theoretical analysis, the inner cup
can be in compressive statc when its maximum circumferential stress bccomes compressive; The maximum circumferential stress of
the inner cup decreases and turns compressive stress from tensile stress as the interference fit increases, while the overall maximum
equivalent stress goes up after decline with the rise of interference fit. Finite element analysis on a packing cup without structure
simplification has the same conclusion with the theoretical analysis. In theoretical analysis, interference it
that makes th
maximum circumferential stress of inner cup turn compression, and that oblains the minimum of overall maximum cquivalent
stress, are derived. The conclusion Is that the design of interference fit should be the larger one between di and 1. This
conclusion can be a reference for designing packing cups for hypercompressors
1g cup
interno
lit: finitc clement analy
其核心装备。超高压压缩机的排气压力超过30
这使得其气缸部件承受巨大的工作载荷
为了保证压缩机安全运行和充分利用材料的力学
在低密度聚乙烯生产过程中,超高压压缩机是性能,气缸填料盘采用了两层厚壁圆筒过配合及
局部结构自増强处理。就设计方法而言
GIACOMELLI等认为由于填料盘的儿何结构复
20141104收到初稿,20160612收到修改稿
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