Electric resistance heating devices – Heating devices – Continuous flow type fluid heater
Patent
1998-10-29
1999-10-26
Walberg, Teresa
Electric resistance heating devices
Heating devices
Continuous flow type fluid heater
392472, 392479, F24H 110
Patent
active
059742275
ABSTRACT:
A method and heating system for a hose and dispenser wand of a hot melt mix applicator using a three phase heating element powered by a generator to heat the hose and wand to maintain hot melt mix material within the hose and wand in a flowable state. To selectively energize the generator to control heat input, the heating system has (1) a controller in communication with a temperature sensor carried by the hose or wand, and (2) an output in communication with a generator control input. The generator control input enables operation of the generator to be controlled by the controller for controlling heating of the hose and wand. The heating element is a cord having a first wire receiving a phase of the three phase current, a second wire receiving another phase of the current, and a third wire receiving another phase of the current, with the cord being wrapped about the hose and wand in a helical configuration. The generator preferably is a vehicle alternator modified so that it outputs three phase electrical power without requiring any voltage or current regulation. In a preferred method, the controller energizes the generator when the sensed temperature of the hot melt mix falls to or below a predetermined setpoint control temperature and deenergizes the generator when the sensed temperature rises to or above a predetermined setpoint control temperature.
REFERENCES:
patent: 4644134 (1987-02-01), Baker
patent: 5832178 (1998-11-01), Schave
Campbell Thor S.
Crafco, Incorporated
Walberg Teresa
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