| 摘要 |
A magnetic fluid seal device, with two or more pole pieces disposed around a magnetic rotating element on both sides of a permanent magnet, each pole piece being formed by alternately joining and first and second magnetic disks differing in inside diameter is related. Tiny gaps are formed between the inner circumference of the magnetic disks having the smaller inside diameter in each pole piece and the outer circumference of the magnetic rotating element, and a magnetic fluid is magnetically captured in these tiny gaps. The magnetic flux density in these gaps is set larger than the saturated magnetization of the magnetic fluid captured in these gaps and the thickness of the first magnetic disks is set somewhare between 0.02 and 0.0 mm.
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