| 摘要 |
PURPOSE:To provide a shaft seal device which generates no wear at a seal portion during operation and no heat even during idling, by providing the shaft seal device with an open and closed operating function such that a seal is in tight contact condition during stoppage, while the seal is in non-contact condition during operation. CONSTITUTION:A swivel piece 5 is swingably mounted through a bolt 6 to a fixed ring 19 fixed to a shaft 1. A magnet 2 fixed to a bracket 20 and a magnet 3 fixed to an upper end of a slide member 7 are arranged in such a manner that N poles of the magnets 2 and 3 are opposed to each other. With this arrangement, the slide member 7 is downwardly biased by a repulsive magnetic force during stoppage, which slide member 7 in turn urges a seal 8 downwardly, thereby rendering the seal 8 in tight contact with a fixed plate 10 fixed to a back casing 9. When the shaft 1 is rotated, the slide member 7 is upwardly urged by the swivel piece 5, thereby rendering the seal 8 in non-contact with the fixed plate 10. |
