Sealing member for ferrofluid seal
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United States of America Patent
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-
Sep 24, 1991
Grant Date -
N/A
app pub date -
Nov 29, 1989
filing date -
Mar 31, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A sealing member for a ferrofluid seal according to the present invention is a sealing member (1) arranged so as to surround a periphery of a working member (5) such as a shaft. The sealing member (1) comprises an annular magnet (2) and an annular pole piece (3), an electrically conductive ferrofluid (6) being provided between the sealing member (1) and the working member (5) to construct an electrically conductive magnetic fluid-sealing member. An inner circumferential surface of the annular magnet (2) is coated with an electrically conductive non-magnetic film (4 ) continuing to the annular pole piece (3) to reduce size of the sealing member (1) and reduce electrical resistance.
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