Electric heating – Heating devices – With heating unit structure
Patent
1976-07-19
1978-05-23
Kozma, Thomas J.
Electric heating
Heating devices
With heating unit structure
219505, 219536, 219541, 338 22R, 338274, H05B 302, H01C 702
Patent
active
040912671
ABSTRACT:
A high efficiency, self-regulating temperature-controlling fluid sump heater for external mount or internal well use comprising a D-shaped thermally conductive housing having a chamber therein and a plurality of heating elements in the chamber. The heating elements are self-heating, positive temperature coefficient (PTC) resistors having low initial resistance which increases abruptly as their temperature rises above a given level. The elements have first and second substantially parallel surfaces spaced one from another, these surfaces each having a layer of electrically conductive material applied thereto for forming on ohmic contact. The heater further comprises two heat sink plates of thermally and electrically conductive material, the plates being positioned to engage the first and second surfaces of the elements and to extend nearly the whole length of the housing with one plate adjacent the flat wall of the D-shaped housing. First and second terminal means are carried by the plates for supplying electrical power to the elements. The chamber is filled with an electrically insulating thermally conductive ceramic for providing better heat transfer while avoiding degradation of the PTC resistors.
REFERENCES:
patent: 2357072 (1944-08-01), Beck et al.
patent: 2562791 (1951-07-01), Imobersteg
patent: 3286214 (1966-11-01), Kolb et al.
patent: 3824328 (1974-07-01), Ting et al.
patent: 3940591 (1976-02-01), Ting
patent: 3996447 (1976-12-01), Bouffard et al.
Haug John A.
Kozma Thomas J.
McAndrews James P.
Texas Instruments Incorporated
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