Thermally controlled vent damper

Automatic temperature and humidity regulation – Miscellaneous – Burner controls with automatic cutoff

Patent

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Details

126292, 236 45, 236 10D, F23N 300

Patent

active

044601212

ABSTRACT:
A thermally operated vent damper wherein a flue pipe (12) mounts an eliptical damper plate (38) for rotation about a hollow rod (30). A slot (42) is formed in the damper plate (38) by bending a flange (44) perpendicular to the plane of the damper plate (38) and providing an opening for a coil (52) of bimetallic material. The coil (52) controls the movement of the damper plate between closed and opened positions responsive to temperature in the flue pipe (12). An opening (19) in the flue pipe adjacent to the coil (52) provides a means for maintaining the coil (52) temperature lower than the flue gas temperature and for controlling the opening of the damper plate in the flue pipe in inverse proportion to the draft therein. A second bimetallic coil (60) is mounted outside the flue pipe to relieve stresses on the first bimetallic coil during prolonged high temperature excursions within the flue pipe.

REFERENCES:
patent: 1659875 (1928-02-01), Jacobs
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patent: 1770339 (1930-07-01), Lake
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patent: 4225080 (1980-09-01), Barth
patent: 4236668 (1980-12-01), Prikkel
patent: 4273283 (1981-06-01), Edwards
patent: 4289271 (1981-09-01), Barth

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