Jet recirculation method for vacuum carburizing

Details Jet recirculation method for vacuum carburizing Jet recirculation method for vacuum carburizing

C - Chemistry, Metallurgy

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C21D 1/773 (2006.01) C21D 1/767 (2006.01) F27B 5/16 (2006.01) F27D 19/00 (2006.01)

Patent

CA 1108398

JET RECIRCULATION METHOD FOR VACUUM CARBURIZING Abstract of the Disclosure A method and apparatus for recirculation of atmosphere in a vacuum furnace which comprises a recirculation loop in which there is a low pressure line from the furnace chamber leading to a recirculation pump which pumps the recycled gas at a higher pressure to a high pressure line back into the furnace chamber. A means to analyze the furnace atmosphere is in communication with the high pressure line and signals its measurements of the atmosphere analysis to a valve on an enriching line. The enriching line passes enriched gas into either the high pressure line or the furnace chamber as the valve opens or closes. A means is provided to withdraw the gas from the furnace chamber in order to maintain the desired furnace chamber pressure as enriching gas is added.

333827

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