| 摘要 |
PURPOSE:To stabilize the sealing characteristic of a magnetic fluid seal device used in a high speed rotary machine, by feeding cooled magnetic fluid into gaps between magnetic rings and a shaft through storage chambers with the use of a cooling facility and a pump. CONSTITUTION:On the inner peripheral side of a nonmagnetic housing 2, a permanent magnet 4 is held between planer magnetic rings 3, and a shaft 1 pierces through the magnetic rings 3 at the center of the latter. Magnetic fluid 5 is applied in gaps between the magnetic rings 3 and the shaft 1. Storage chambers 6 for reserving magnetic fluid 5 are defined between the magnetic rings 3 and the nonmagnetic housing 2 on the magnetic ring 3 side at the upper and lower positions of the housing 2. Magnetic fluid which is always cooled is automatically fed into holes 11 through the storage chambers 6 by means of a cooling facility 10 and a pump 9. Therefore, an increase in temperature of magnetic fluid 5 caused by the heat of shearing friction generated by the rotation of the shaft 1 is restrained due to the heat transmission of the magnet rings 3, and substantially no lowering of sealing characteristic is caused, thereby dissipation of magnetic fluid 5 is slight. |
