大间隙多级磁源磁性液体密封的实验研究

在某些特殊应用场合尤其是军工领域中要求采用磁性液体密封技术解决大间隙条件下的密封问题。为了提高和验证大间隙条件下磁性液体密封性能，设计了一种多级磁源磁性液体密封结构；实验研究了0.4 mm、0.5 mm、0.6 mm、0.7 mm不同间隙高度下其密封性能与自愈合性能，并将其与单级磁源磁性液体密封的理论耐压值进行了比较、分析和讨论。结果表明：多级磁源磁性液体密封的耐压能力与自愈合能力随着密封间隙的增大而减小；对应于4种不同高度的间隙，多级磁源磁性液体密封的耐压能力分别为单级磁源磁性液体密封耐压能力的4.8倍、3.8倍、2.8倍和2.5倍；大间隙多级磁源磁性液体密封具有良好的自愈合能力。

Experimental Study of Magnetic Liquid Seal with Large Gap and Multiple Magnetic Sources

In some special applications, especially in the military industry, a magnetic liquid sealing technique is needed to solve the problem of leakage in the large gap. To improve and verify the pressure capability of magnetic liquid seal with large gaps, a magnetic liquid sealing structure with multiple magnetic sources is designed. The sealing capability and self-healing capability of magnetic liquid seal with multiple magnetic sources with 0.4 mm, 0.5 mm, 0.6 mm and 0.7 mm gaps are investigated by using experimental methods. The relations between the experimental results of magnetic liquid seal with multiple magnetic source and the theoretical results of magnetic liquid seal with single magnetic source are analyzed. The results show that the sealing capability and self-healing capability of magnetic liquid seal with multiple magnetic source decrease with the increase in gap height; the pressure capabilities of magnetic liquid seal with multiple magnetic source are 4.7, 3.8, 2.8 and 2.5 times of that of a magnetic liquid seal with single magnetic source for four different sealing gaps. In addition, the magnetic liquid seals with large gaps and multiple magnetic sources have good self-healing capabilities.