Abstract
To improve the self-repairing performance of common ferrofluid seal (FS) and meet sealing requirements of long life under vacuum conditions, the interlaced FS device was developed. Effects of the number of axial pole teeth (PT), the number of radial PT, the width of the axial sealing gap (SG), and the height of the radial SG on their self-repairing performance were studied through experimental methods and compared with the self-repairing performance of the common FS. The results reveal that the self-repairing performance of interlaced FS is significantly better than that of the common FS with an increase in the number of FS ring ruptures. The ability to self-repairing of the interlaced FS diminishes or remains unchanged. As the quantity of axial PT increases, the self-repairing performance of interlaced FS is enhanced and then weakened. As the number of radial PT increases, the self-repairing performance of interlaced FS is weakened and then enhanced and then weakened. When the axial SG width exceeds 0.1 mm, the self-repairing performance of interlaced FS is weakened with the increase of SG. When the height of the radial SG exceeds 0.1 mm, the self-repairing performance of interlaced FS is weakened with the increase of SG.
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