Failure indicator seal for a rotary feedthrough
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United States of America Patent
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Sep 10, 2013
Grant Date -
Mar 1, 2012
app pub date -
Aug 26, 2010
filing date -
Aug 26, 2010
priority date (Note) -
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Abstract
A failure indicator seal includes a nonmagnetic housing, a plurality of annular pole pieces having distal ends, the plurality of annular pole pieces disposed within the nonmagnetic housing, an annular, non-conducting magnet disposed between the pole pieces, a predefined quantity of magnetic fluid disposed between each of the distal ends of the plurality of annular pole pieces and the rotary shaft of a rotary feedthrough forming a plurality of magnetic fluid O-ring seals, and means for measuring resistance through the plurality of annular pole pieces, the plurality of magnetic fluid O-ring seals and the rotary shaft.
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