Tapered ferrofluid seal
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United States of America Patent
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-
Jan 2, 1990
Grant Date -
N/A
app pub date -
Apr 18, 1988
filing date -
Apr 18, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A ferrofluid seal wherin the amount of ferrofluid which may be used is increased by tapering the gap in which the ferrofluid is retained from one end of the gap to the other. One side of this gap is the magnet and, where used, pole pieces used to generate the magnetic field retaining the sealing ferrofluid, and the other side is a wall forming the opening to be sealed. The tapering of the gap width may be achieved by tapering either side forming the gap or by tapering both sides. The taper is preferably uniform from one end of the gap to the other.
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