Magnetic fluid seal with precise control of fluid volume at each seal stage
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United States of America Patent
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Nov 14, 2017
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N/A
app pub date -
Mar 31, 2015
filing date -
Oct 18, 2007
priority date (Note) -
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Abstract
A magnetic fluid seal includes a pole ring having an inner diameter, a rotatable shaft having an outer diameter, the rotatable shaft configured to extend along the inner diameter of the pole ring between an atmosphere side and vacuum side, at least one magnet coupled to the pole ring, the at least one magnet configured to emit a magnetic field having a strength and a shape, and grooves formed on either the inner diameter of the pole ring or the outer diameter of the shaft, the grooves capable of containing ferromagnetic fluid. The ferromagnetic fluid contained the grooves varies so as to improve the performance of the magnetic fluid seal.
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