Electric resistance heating devices – Heating devices – Continuous flow type fluid heater
Patent
1996-06-25
1998-11-03
Jeffery, John A.
Electric resistance heating devices
Heating devices
Continuous flow type fluid heater
392466, 392480, 2221465, 290 2, 1263435A, 322 33, 388934, F24H 118, B05C 100
Patent
active
058321780
ABSTRACT:
A method and heating system for a hose and dispenser wand of a hot melt mix applicator uses 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.
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Crafco Inc.'s BAX 250 Bitumen Applicator.
Crafco Inc.'s LF-150 Loopfill Melter Applicator.
Crafco Inc.'s Super Shot 60 (Part No. 43300).
Crafco, Incorporated
Jeffery John A.
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