| 摘要 |
PURPOSE:To make the supply of magnetic fluid automatically and promptly operable, even without operating a process to lower the gas pressure with a running ceased of the rotary machine. CONSTITUTION:Two ring-shape ball blocks 2, that surround a rotary shaft 1, are supported to inner circumferential face of a fixed casing 4 through a ''O'' ring 3, and a magnetic unit cylinder 6, facing to inner circumferential face of the above described block 2, is engaged to be installed to the rotary shaft 1 through ''O'' ring 5, and in the portion of a ring-shape fine protrusion 7 on this cylinder 6 is intermediately placed a magnetic fluid 15 to perform the sealing operation. In this case, when damaged a seal of the magnetic fluid 15 portion deriving from any reason, pressures of a space 11, 13 are equalized to eliminate a pressure difference between pressure detectors 22, 23. With this pressure signal if transmitted to a coincidence circuit 21, a pulse is transmitted from a pulse transmitter 20, and fed to a pulse motor 18 through an amplifier 19. In this way, an injection device 16 is actuated to feed a magnetic fluid from a feed path 14. |
