Pressure resistant static and dynamic seal assembly and method
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United States of America Patent
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Feb 2, 2016
Grant Date -
Dec 25, 2014
app pub date -
Dec 14, 2012
filing date -
Dec 19, 2011
priority date (Note) -
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status (Latency Note)
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Abstract
A seal assembly includes a stator attached to a housing and a rotor attached to a shaft. A static sealing member is attached to the stator presenting a contact with the rotor at stand-still. An electromagnetic is attached to the stator at a distance from an end of the static sealing member. The static sealing member is activated and moved away from the rotor by the magnetic force exerted by the electromagnet as the shaft rotates. The electromagnet is controlled by a control system for controlling the equipment in which the bearing isolator is used. To deactivate the static sealing member during shaft rotation, the bearing isolator may have its own control system with a sensor to indicate if the shaft is rotating. As the shaft rotates, contaminants are expelled through gaps between the stator and the rotor.
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