Sealing mechanism for a vacuum heat treating furnace
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United States of America Patent
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Mar 31, 2015
Grant Date -
Aug 5, 2010
app pub date -
Feb 3, 2010
filing date -
Feb 3, 2009
priority date (Note) -
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Abstract
An apparatus for sealing a fan drive shaft in a vacuum heat treating furnace is disclosed. The sealing apparatus includes a housing having an annular body and a central opening. An inflatable first seal surrounds the central opening of the annular body. A second seal surrounds the central opening and is adjacent to the inflatable first seal. The sealing apparatus also includes a channel formed in the annular body adjacent to the second seal for conducting a purging fluid into the central opening. A means for injecting the purging fluid into the central opening is operably connected to the channel. A vacuum heat treating furnace and a fan drive system incorporating the sealing apparatus are also described.
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