Electric resistance heating devices – Heating devices – Immersion heater details
Patent
1992-06-08
1994-01-11
Bartis, Anthony
Electric resistance heating devices
Heating devices
Immersion heater 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).
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Bartis Anthony
Miller Wendell E.
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