Automatic temperature and humidity regulation – Miscellaneous – Burner controls with automatic cutoff
Patent
1978-02-23
1981-02-17
Makay, Albert J.
Automatic temperature and humidity regulation
Miscellaneous
Burner controls with automatic cutoff
126285B, 431 21, F23L 1100
Patent
active
042510244
ABSTRACT:
An automatic vent damper for combustion devices such as furnaces which closes the combustion chamber exhaust vent when the furnace burner is off to conserve heat and prevent backdrafts. A damper blade pivotally mounted in the exhaust vent is closed by an electrically-operated damper motor operating against a torsional spring urging the damper plate into the open position, the damper motor being energized whenever burner operation is not in demand by the automatic controls. When the controls call for burner operation, the motor is deenergized and the damper blade moves to the open position under the influence of the torsional spring. A limit switch senses the damper blade achieving the open position and enables burner operation. An electrically conductive, thermally fusible link is positioned within the vent in series with the power supply for the control circuit powering the damper motor and burner controls so that in the event a failure results in burner operation with the damper blade closed, the fusible link melts and thereby deenergizes the damper motor and burner controls allowing the torsional spring to move the damper blade to the open position. The damper blade and actuator components are mounted on a cast iron housing mating with the vent ducts to prevent corrosion or temperature-induced distortions from jamming the damper blade, providing reliable operation over extended periods. A solid state relay or delay switching device is alternatively utilized to control energization of the damper motor to insure reliable operation.
REFERENCES:
patent: 2037363 (1936-04-01), Branche
patent: 2112554 (1938-03-01), Beam
patent: 2129059 (1938-09-01), Herbster et al.
patent: 3906253 (1975-09-01), Farley
patent: 4017024 (1977-04-01), Grostick et al.
patent: 4021187 (1977-05-01), Schulte et al.
patent: 4079884 (1978-03-01), Sherman
patent: 4102629 (1978-07-01), Feinberg
patent: 4108369 (1978-08-01), Prikkel
Bennett Henry
Makay Albert J.
Paragon Resources, Inc.
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