Ferrofluid sealing device
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United States of America Patent
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-
Oct 23, 2001
Grant Date -
N/A
app pub date -
Nov 22, 1999
filing date -
Nov 26, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A ferrofluid sealing device retaining a ferrofluid between a shaft and a pair of inner and outer pole pieces rotating in opposite directions, in which grooves are formed on a shaft surface that faces the inner diameter surfaces of pole pieces. In the sealing device, one of the pole pieces may be made thicker than the other and further a projection portion can be formed on the shaft surface facing the inner peripheral faces of the pole pieces. The sealing device can prevent, even when the ferrofluid seal is operated at a higher rotation speed, splashing of ferrofluid over the surroundings, thereby avoiding staining the surroundings as well as prolonging its lifetime.
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