Abstract: The main problem in the application of nano-ferrofluid sealing magnetic field is how to find a way to estimate the sealing capability. There are many factors affecting the sealing capability, for example, the characteristics of nano-ferrofluid, the structure of magnetic pole, the process of load function, etc., in which the structure design of magnetic pole is the most important factor for the sealing capability of magnetic field. The numerical analysis method was used to simulate the distribution of magnetic field of the sealing device and experimental investigation was made to study the influence of the structure parameters of a typical magnetic pole on the sealing capability. These experiments indicated that numerical simulation and regression equation calculation could reflect the sealing capability. By considering a specific tolerance the regression equations could be used as the guidance in designing nano-ferrofluid sealing device.

摘要： 纳米磁性流体密封的应用中最关键的问题是密封能力的确定，其影响因素很多，如纳米磁性流体本身的性质、磁极结构、负载运行过程等。其中磁极结构的设计对密封能力有着决定性的影响。本文从磁极结构出发，用数值计算的方法对密封装置的磁场分布进行仿真，探讨典型磁极结构参数对密封能力的影响规律，并进行了密封实验。实验研究表明，数值仿真计算方法和回归方程的结果能较真实的反映密封性能，在考虑一定裕度的情况下，可以用计算结果指导纳米磁性流体密封装置的设计。