Method and apparatus for quickly purging atmosphere gas from bel

Details Method and apparatus for quickly purging atmosphere gas from bel Method and apparatus for quickly purging atmosphere gas from bel

1988-06-15

1989-09-19

Yuen, Henry C.

Heating

Processes of heating or heater operation

Including preparing or arranging work for heating

432 9, 432205, 432206, F27D 500, F27B 504

Patent

active

048676756

ABSTRACT:
A method and apparatus for vacuum purging bell type furnaces is provided. A vacuum shell unit is provided which is removably emplacible over the inner cover of the furnace and has a vacuum tight seal to the base. A vacuum is pulled both within the inner cover and within the vacuum shell to remove the ambient gas. Nitrogen is then introduced into the inner cover and within the vacuum shell. The vacuum shell is then removed and purging continues within the inner cover either with nitrogen or other desired atmosphere gas, and finally furnace is emplaced over the inner cover to heat treat the work in a conventional manner.

REFERENCES:
patent: 3024015 (1962-03-01), Huebler et al.
patent: 3112919 (1963-12-01), Gunow
patent: 3411763 (1968-11-01), Blackman et al.
patent: 3540710 (1970-11-01), Yamagishi
patent: 3554511 (1971-01-01), Wald
patent: 3572666 (1971-03-01), Fehr
patent: 3603570 (1971-09-01), Goleone
patent: 4596526 (1986-06-01), Soliman

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