Electric heating – Heating devices – With heater-unit housing – casing – or support means
Patent
1984-09-18
1986-10-14
Bartis, A.
Electric heating
Heating devices
With heater-unit housing, casing, or support means
219306, 219316, 219318, 219335, 219534, 219544, H05B 378, H05B 348
Patent
active
046174567
ABSTRACT:
A flexible electric heating assembly for immersion heating of highly corrosive liquids, such as electroplating solutions, includes an iron-nickel-chronium resistance element disposed within a thin-walled stainless steel tube and electrically insulated therefrom by a magnesium oxide ceramic. The tube is enclosed in a tubular casing in direct contact with the tube and formed of resilient electrical insulating material having a low surface coefficient of friction and a high resistance to heat and attacks by corrosive liquids or vapors, e.g., polytetrafluroetylene. The ends of the tube terminate withn a non-corrosive junction box located outside the liquid to be heated, and in which box the connections between the power supply and heating element terminals are made. A wire clamping member surrounds each end of the tubular casing within the junction box and is twisted to exert a compressive force continuously around the outer casing to prevent any corrosive liquids and vapors from penetrating between the outer casing and the clamping member. The junction box is filled with an epoxy resin potting material which covers all the electrical connections, the ends of the tubular casing and clamping members, with the clamping members being receptive to the potting material so that a gas-tight seal is effected between potting material and the surfaces of the clamping members contacted thereby.
REFERENCES:
patent: 2708233 (1955-05-01), Moore
patent: 3657520 (1972-04-01), Ragault
patent: 3663799 (1972-05-01), McArn
patent: 3673386 (1972-06-01), Drugmand et al.
patent: 3674985 (1972-07-01), Ragault
patent: 4068116 (1978-01-01), McKinstry
patent: 4158764 (1979-06-01), Yane
Lokar Raymond S.
Richards Tom
Bartis A.
Hazzard John P.
Process Technology Inc.
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