Interlock feed-through and insulator arrangement for plasma arc

Details Interlock feed-through and insulator arrangement for plasma arc Interlock feed-through and insulator arrangement for plasma arc

1990-11-09

1992-06-02

Albritton, C. L.

Industrial electric heating furnaces

Resistance furnace device

With internal atmosphere control

432242, 432250, 432 5, F27D 706

Patent

active

051193957

ABSTRACT:
An industrial electrical, vacuum furnace for ion processing of work is provided with an improved feed-through interlock and insulator arrangement. A sealed interlock chamber on the furnace door is in fluid communication with the furnace's heat treat chamber. A bellows outside of the interlock chamber is in fluid communication therewith. When a vacuum is drawn in the heat treat chamber, the bellows distends into a collapsed position to provide a firmly clamped electrical connection with the feed-through which extends through the door into the interlock chamber. The feed-through is thus pinned by the bellows at one end and a V-shaped pulley guide arrangement within the furnace controls thermal distortion of the feed-through. The insulator arrangement includes a plurality of interlocking, ceramic caps or spacers which are stacked one on top of the other to define tortuous paths or gaps therebetween which prevent electrically conductive material deposited thereon during the ionizing process from establishing an electrically conductive path along which or as a result thereof an ion glow discharge or arcing or short circuiting could occur.

REFERENCES:
patent: 4246434 (1981-01-01), Gunther et al.
patent: 4787844 (1988-11-01), Hemsath
patent: 4789333 (1988-12-01), Hemsath
patent: 4840559 (1989-06-01), Hemsath
patent: 4853046 (1989-08-01), Verhoff et al.
patent: 4854860 (1989-08-01), Hemsath
patent: 4854863 (1989-08-01), Hemsath

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