Vent control arrangement for combustion apparatus

Details Vent control arrangement for combustion apparatus Vent control arrangement for combustion apparatus

1979-12-19

1981-08-18

Tapolcai, Jr., William E.

Automatic temperature and humidity regulation

Miscellaneous

Burner controls with automatic cutoff

236 68R, 251 11, F23N 300

Patent

active

042842352

ABSTRACT:
Combustion apparatus having a vent with a damper actuated by an element comprised of a material having a shape memory effect. The element is heated and cooled above and below the deformation temperature for causing the element to deform between its different shapes for changing the position of the damper within the vent. Control means is provided in one embodiment for heating the shape memory element so that it deforms for moving the damper closed during a shutdown mode of the combustion apparatus, and in another embodiment the shape memory element is heated so that it deforms to a shape for holding the damper open during the heating mode of the apparatus.

REFERENCES:
patent: 3645443 (1972-02-01), Willson et al.
patent: 4039123 (1977-08-01), Frankel
patent: 4079884 (1978-03-01), Sherman
patent: 4175695 (1979-11-01), Cresswell
patent: 4193541 (1980-03-01), Scheidweiler
patent: 4205783 (1980-06-01), Dietsche et al.

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