| 摘要 |
PURPOSE: To provide a magnetic fluid sealing device being compact, light and capable of providing a sufficient sealing function. CONSTITUTION: In a magnetic fluid sealing device for forming a seal ring of the magnetic fluid 11 between a rotary shaft 1 and an annular permanent magnet 2 provided concentrically with the rotary shaft 1, the annular permanent magnet 2 having the inner and outer peripheral sides having different poles from each other is used. In the radial section of the permanent magnet 2, a tapered part 3 covering toward the rotary shaft 1 is provided on the inner peripheral part of the permanent magnet 2, while a magnetic pole piece 5 having an extension part 4 bulging toward the rotary shaft 1 side is provided to be spaced by a fixed gap from the side of the permanent magnet 2 on the side of the permanent magnet 2. |
