Electric immersion heater with restricted heat-flow paths to the

Electric resistance heating devices – Heating devices – Immersion heater details

Patent

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Details

119 73, 219523, 219530, 219540, 392444, 392447, H05B 102, H05B 380, F24H 106

Patent

active

052789411

ABSTRACT:
An electric immersion heater (10) is provided for heating fluids, such as water in a livestock watering tank. The electric heater includes a heater subassembly (26), a protective cover (39), and a power cord (21) having a power plug (24). The heater subassembly (26) includes a heating element (14) having first and second ends (16A and 16B) and a molded metallic case (12 or 12A) enclosing the heating element (14). The protective cover (39) encloses and hermetically seals the operative connection of a thermostatic switch (18), the first and second ends (16A and 16B) of the heating element (14), and first, second, and third conductors (22A-22C) of the power cord (21). The thermostatic switch (18) is bonded in heat-receiving proximity to the molded case (12 or 12A). Potting compound (38) disposed intermediate of the thermostatic switch (18) and the fluid to be heated is provided as a thermal barrier for restricting the heat flow from the fluid to the thermostatic switch (18). An elongated slot, recess, opening, or passageway (82) disposed in the molded case (12 or 12A) intermediate of the heating element (14) and the thermostatic switch (18), is provided as a barrier for reducing the rate of heat transferred to the thermostatic switch (18) from the heating element (14). In addition, the elongated slot, recess, opening, of passageway (82) provides means for transmitting heat to the fluid causing a cooling effect on the thermostatic switch (18).

REFERENCES:
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patent: 2432169 (1947-12-01), Morgan et al.
patent: 2437262 (1948-03-01), Levitt et al.
patent: 2454091 (1948-11-01), Rietz
patent: 2472178 (1949-06-01), Temple
patent: 2561932 (1951-07-01), Landgraf
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patent: 2977454 (1961-03-01), Volker
patent: 3497677 (1970-02-01), Blain
patent: 4068116 (1978-01-01), McKinstry
patent: 4358667 (1982-11-01), Johnson et al.
patent: 4599973 (1986-07-01), Ward
patent: 4835366 (1989-05-01), Owen et al.

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