Automatic temperature and humidity regulation – Miscellaneous – Burner controls with automatic cutoff
Patent
1977-06-02
1979-02-27
Wayner, William E.
Automatic temperature and humidity regulation
Miscellaneous
Burner controls with automatic cutoff
236 93R, 236101B, F23L 300, G05D 2308
Patent
active
041414950
ABSTRACT:
The combustion gases of a burner in a heating furnace are discharged to a vent through a draft hood having three ports. The first and second ports communicate with the furnace and the vent respectively and define a first flow path for combustion gases through the chamber of the hood. The third port is open to the ambient atmosphere and defines a second flow path for dilution air through the chamber. Separate temperature responsive, bimetallic elements sense the temperatures in the two paths and cause a vent damper to be moved toward and away from a position in which it closes the second port in response to the sensed temperatures to minimize the flow of dilution air. In a modified embodiment the draft hood is vertically elongate with the bimetallic elements positioned in a zone filling with hot products of combustion for minimizing the flow of dilution air and minimizing spillage of products of combustion during start-up and sudden changes in draft.
REFERENCES:
patent: 3134377 (1964-05-01), Kawoy
patent: 3510059 (1970-05-01), Diermayer et al.
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