3种不同形式的板弹簧性能分析.pdf

第43卷第1期
南京航空航天大学学报
Vol
2011年2月
Journal of Nanjing University of Aeronautics &Astronautics
Feb.2010
3种不同形式的板弹簧性能分析
周文杰1王龙一1甘智华2吴英哲1李一河邱利民
(1.浙江大学制冷与低温研究所,杭州,310027;2.浙江大学能源清洁利用国家重点实验室,杭州,310027)
摘要:板殚簧技术是航空航天用斯特林制冷机长寿命、高可靠运行的关健技术之一。大的板弹径向刚度为活愙
提供支撐,以保证活塞在极小的间隙内实现与汽缸之间的无接触送动;板弹簣轴向刚度为活寡直线运动提供轴
向的自由度,其轴向的最大行程受到板弹箦材料藏劳极胆的限制;由于没有活霎环等密封元件,高低压之间的密
封通过活塞与气缸之间的间隙密封来实現,这大大提高了活塞和气缸间的策配难度。本文针对3种常见的板弹
:同心涡板弹、偏心涡放骨板弹簧和直线骨板弾簧进行有限元分析。通过改吏板弹戟荷、厚度和弹
骨宽度等参数,对3种型式的板弾簧分别进行加載求解,得到弹黃的应力和位移分布云因。通过模态分析得到板
弹的自然频率,为有效避免板弹的谐振提供据。分析表明:在基本结构参数相同的情下,直线骨板弹
可以擬供较大的径向刚度与轴向刚度之比和较高的自然频率,有利于整机系统的轻量化。
关键词:线性压编机;板殚;有服元;刚度;应力;国有频率
中图分类号:TB6
文献标识码:A
文章编号:1005-2615(2011)01-0079-07
Performance Analysis of Three Type Flexure Bearings
for Linear Compressors
Zhou Wenjie Wang Lon gyi, Gan Zhihua=, Wu Yinghe, Li Yiting Qiu Limin
(1. Institute of Refrigeration and Cryogenics, Zhejiang University, Hangzhou, 310027, China,
2. The State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou, 310027, China
Abstract: The flexure bearings are one of the key components with long life, high reliable stirling cry-
ocoolers for the aerospace use. The large radial stiffness of the spring provides a support for piston to
ensure it works in a non-contact way with cylinder. The small axial stiffness of the flexure bearing en
sures the piston working freely in the cylinder. The largest axial displacement is limited by the material
fatigue limit restrictions. Because of the absence of the piston ring, the seal between the cylinder and the
back volume is pressurized by the clearance gap, thus improving the piston and cylinder assembly tech-
nology. In this paper, three common flexure bearings including concentric flexure bearings, eccentric
flexure bearings and linear arm flexure bearings are analyzed by FEM software. By changing the load
the thickness and the width of flexure bearing, the three types of plate spring are solved, and results of
stress and displacement contours are shown. By using the modal analysis, the natural frequency is ob-
tained to avoid the resonance nature frequency of spring. Analysis results show that on the same basic
structure, the linear arm flexure bearings provide the largest axial and radial stiffness, and the highest
natural frequency, thus it is conductive to the lightweight of the whole cryocooler system in aerospace
use
Key words: linear compressor; flexure spring; FEM method; axial and radical stiffness; stress; nature
frequency
基金项目:国家自然科学基金(50876094)资助项目;国家“九七三”计划(2010CB227303)资助项目
收稿日期:2010-05-04;修订日期:2010-09-28
通讯作者:甘智华,男,博士,教授,1973年2月生,E-mail:gan- zhihua(@iu.edu.c
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