带缓冲垫圈的辅助轴承结构特性研究及仿真分析  

Structure Characteristics Research of Auxiliary Bearing with Buffer Shim and Simulation

作　　者：何梁[1] 杨国军[1] 刘兴男[1] 时振刚[1] 

机构地区：[1]清华大学核能与新能源技术研究院先进核能技术协同创新中心先进反应堆工程与安全教育部重点实验室,北京100084

出　　处：《润滑与密封》2016年第11期15-19,共5页Lubrication Engineering

基　　金：国家自然科学基金项目(51275261);国家科技重大专项项目(ZX069)

摘　　要：辅助轴承主要用于承载高速跌落的转子,并在承受巨大冲击载荷时不会失效。为降低跌落时对辅助轴承的碰撞力,保护电磁轴承及转子系统,提出一种基于轴向缓冲垫圈的辅助轴承结构。结合清华大学核研院的10 MW高温气冷堆电磁轴承氦风机实验台架,基于有限元方法,对转子跌落时辅助轴承外圈添加和未加轴向缓冲垫圈时辅助轴承的结构特性以及受力情况进行仿真分析,得到碰撞力最大时刻结构的应力分布,从理论上验证了辅助轴承在跌落时的可靠性。结果表明:缓冲垫圈的加入可有效减小转子跌落对辅助轴承的碰撞力,对辅助轴承起到了一定的保护作用,为进行转子跌落实验及该结构的实际应用提供了重要参考。Auxiliary bearing is mainly used to support the dropping rotor with high revolution when the active magnetic bearing fails to work, which must be able to bear the huge impact load.In order to reduce the impact force to the auxiliary bearing effectively and protect the active magnetic bearing and rotor system, a new auxiliary bearing structure based on axi- al buffer shim was proposed.Based on the finite element method and LS-DYNA software ,combining with the experiment rig of the active magnetic bearing in the helium circulator of 10 MW high temperature gas-cooled reactor （HTR-10）, the struc- ture characteristic and stress state were analyzed for the auxiliary bearings with and without axial buffer shim on the bearing outer ring when rotor drops.The stress distribution of the axial buffer shim was also analyzed, and the reliability of the aux- iliary bearing when rotor drops is verified theoretically.The result shows that the buffer shim can effectively reduce the im- pact of the rotor drop to the auxiliary bearing, which provides an important reference for the rotor drop experiment and theo- retical foundation for the practical application of the structure.

关 键 词：电磁轴承 辅助轴承 缓冲垫圈 冲击载荷 

分 类 号：TH133.3[机械工程—机械制造及自动化]