| 摘要 |
PURPOSE:To keep the pressure resistance inside a sealing device constant even if the environmental temperature is changed by constituting a portion on the way of a magnetic path or a portion adjacent to the magnetic path of a heat sensitive magnetic body. CONSTITUTION:As shown in the sectional view, a sealing device is constituted of pole pieces 2 contacted both sides of a ring-like permanent magnet 1, magnetic rotary body 4 and magnetic fluid 3 caught between the pole pieces 2 and the rotary body 4. A annular temperature sensitive magnetic fluid 5 is interposed between the right and left pole pieces 2 so as to touch the inner periphery of the permanent magnet 1. For instance, Mn-Zn group heat sensitive ferrite or the like is used as the heat sensitive magnetic body. |
