Jet recirculation method for vacuum carburizing

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

1978-08-21

1980-03-04

Rutledge, L. Dewayne

Metal treatment

Compositions

Heat treating

266 44, 266250, 266251, 432 21, 432199, 432203, C21D 148

Patent

active

041915984

ABSTRACT:
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.

REFERENCES:
patent: Re29881 (1979-01-01), Westeren et al.
patent: 3128323 (1964-04-01), Davis
patent: 3397875 (1968-08-01), Davis
patent: 3796615 (1974-03-01), Westeren et al.

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