Temperature self-limiting electric fuel oil heater for oil burne

Electric heating – Heating devices – Combined with container – enclosure – or support for material...

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48103, 123549, 123557, 219206, 219535, 222146HE, 222135, 239431, 431208, F23D 1144, H05B 340, F24H 110

Patent

active

044069430

ABSTRACT:
A heating unit preheats and stabilizes No. 2 fuel oil delivered through a conduit to the nozzle of an oil burner for optimizing efficiency of combustion. The heating unit is generally formed around a section of oil conduit or other elongate tubular metal core (18) at least equal to the inside diameter of the oil delivery conduit in which it is to be incorporated. At least one coat or layer (20) of heat conducting electrically insulating porcelain-like cement is formed on the core. A helical heating element or coil (21) of high temperature alloy wire surrounds the layer (20) and core (18). The outside of the coil is covered by an electrical and thermal insulating second layer (22) of refractory-type cement of lower thermal conductivity than the porcelain-like cement. The entire unit may be housed in an elongate box (16) packed with high temperature insulation (27) and with high temperature double insulated lead wires (24, 25, 26) extending into the box from the secondary of a 12-14 volt, 4-7 amp transformer. In the preferred example the heating coil ( 21) comprises resistance wire of flat ribbon configuration of an alloy such as "Kanthol D", dimensioned to provide a total resistance in relation to the power supply so that the temperature of the coil is self limiting to the approximate range of from 70.degree. F. (21.degree. C.) to 175.degree. F. (80.degree. C.).

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