| 摘要 |
A removable cartridge includes a permanent magnet, a pole piece, a shaft sleeve and a magnetic fluid between the pole piece and the shaft sleeve and forming a magneto-fluidic seal by directing a magnetic field from the permanent magnet through the magnetic fluid. The magnetic field in the magnetic fluid is reduced when the cartridge is stored to reduce the aging process of the magnetic fluid either by diverting the magnetic field, or by saturating magnetic flux from the magnet through a reduced with of the shaft sleeve.
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