Industrial electric heating furnaces – Resistance furnace device – With internal atmosphere control
Patent
1987-06-12
1988-07-26
Envall, Jr., Roy N.
Industrial electric heating furnaces
Resistance furnace device
With internal atmosphere control
F27D 302
Patent
active
047605847
ABSTRACT:
The present arrangement includes a plurality of hearth support members. In the preferred embodiment each hearth support member is located to pass through the wall of a vacuum furnace housing and on into the hot zone thereof. Each hearth support member includes a hollow stainless steel tube which is secured at its bottom end to a brass base member. At the top end of each hollow support member there is located an electrically conducting adapter which is formed to supportively engage with the hearth. Within each hollow support member a ceramic encapsulated thermocouple is located with the ceramic encapsulating member running the length of the metallic hollow support member and the lead wires to the thermocouple protruding therefrom. Each hollow support member assembly is: (1) connected to an electrical energy source to provide electrical energy to the hearth; (2) electrically isolated from the vacuum furnace housing; (3) insulated by ceramic sleeves to prevent a glow discharge between the support member and the wall; and (4) secured (but insulated) at a section along its length from the outside of the vacuum furnace housing. Accordingly the support members physically support the hearth, provide electrical energy thereto which is necessary to effect a plasma within the vacuum furnace and provide a means for measuring temperature at the hearth.
REFERENCES:
patent: 4102637 (1978-07-01), Kreider et al.
patent: 4246434 (1981-01-01), Gunther et al.
Cleaver William E.
Envall Jr. Roy N.
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