High Temperature Device Shaft Brush Seal Assembly, Brush Seal, And Mounting Arrangement
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United States of America Patent
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N/A
Issued Date -
Oct 24, 2013
app pub date -
Dec 13, 2011
filing date -
Dec 13, 2010
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A shaft seal assembly externally mounted to a high temperature device, such as a gas or steam turbine, having a plurality of rotary shaft sealing brush seals that includes at least one brush seal of wear-compensating construction that possesses a suitably high linear coefficient of expansion so it viscoelestically creeps over time compensating for brush seal wear. In one embodiment, a brush seal closest to the device is formed of an electrically conductive material that electrically grounds a rotary shaft of the device during shaft rotation and at least one other brush seal is formed of filaments of polymeric material, such as heat stabilized nylon, of wear compensating construction. In one preferred embodiment, the filaments of the inner brush seal are made of a self-lubricating metallic or bearing material and at least one other brush seal is formed of an intumescing material that can be of polymeric composition.
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