DEVICE AND METHOD FOR PROTECTING AN OPTICAL OBSERVATION OPENING
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United States of America Patent
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Issued Date -
Aug 8, 2013
app pub date -
Aug 29, 2011
filing date -
Sep 29, 2010
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The invention relates to a diaphragm device (38) and to a method for protecting an optical observation opening (39), in particular for protecting the observation opening against contaminants from a dirty atmosphere (35) in a blast furnace or the like, having a nozzle unit and a purging gas chamber (43), wherein the nozzle unit forms a diaphragm aperture (26) for the observation opening and is used to form a purging gas flow, wherein the purging gas chamber is formed between an optical surface (41) of the observation opening and the diaphragm aperture. A purging gas is applied to the purging gas chamber and purging gas can be led through the diaphragm aperture into the dirty atmosphere, wherein the nozzle unit has a flow guiding device (31, 49) which effects guidance of the flow of purging gas escaping into the dirty atmosphere.
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