在理论分析和实验研究的基础上,介绍了研制的一种性能良好的磁密封装置.它可作为低温气体制冷机和真空机械中的动密封.对磁密封装置的工作机理和磁路进行了分析,并利用虚功法,推导出密封能力的计算公式.经实验和测试证明,装置的密封性能良好,几乎无泄漏,基本解决了往复运动机械中的油污染问题,且工作寿命长、结构紧凑、使用可靠.这是一种颇有发展前途的密封方法. On the basis of theoretical analysis and experimental study, a kind of good magnetic sealing device is introduced, which can be used as a dynamic seal in cryogenic gas refrigerators and vacuum machines. The working principle and magnetic circuit of the magnetic sealing device Analysis and use of virtual work method to derive the calculation formula of sealing ability.Experiments and tests show that the sealing performance of the device is good, almost no leakage, the basic solution to the problem of oil pollution in reciprocating machinery, and long working life, the structure Compact and reliable, this is a promising method of sealing.