Combustion – Timer – programmer – retarder or condition responsive control – By combustion or combustion zone sensor
Patent
1986-12-03
1988-10-18
Scott, Samuel
Combustion
Timer, programmer, retarder or condition responsive control
By combustion or combustion zone sensor
431 46, 431 51, 250554, 136253, 137 65, F23N 508
Patent
active
047783788
ABSTRACT:
A self-powered control system for a gas-fired appliance having a pilot burner and a main burner includes an emissive surface in the flame of the pilot burner and a photovoltaic device for irradiation from the emissive surface for providing electrical power for the control system. Two normally closed electromagnetic latching valves are arranged in series between a source of fuel gas and the main burner with a connection to the pilot burner between the two valves. The first valve is latched open when the photovoltaic device is irradiated by the emissive surface and is unlatched to close when the device is not so irradiated. The second valve is unlatched to close when the main burner is not burning. A double acting solenoid or the like is used for sequentially opening the first and second valves for lighting the pilot and main burners. A safe, reliable control system is thereby provided without external electrical power. Similar principles are used for powering a safety flue damper and air flow fan.
REFERENCES:
patent: 2306073 (1942-12-01), Metcalf
patent: 2698140 (1954-12-01), Buehler
patent: 2919858 (1960-01-01), Matthews
patent: 3174535 (1965-03-01), Weber
patent: 3704980 (1972-12-01), Lokkart
patent: 3751303 (1973-08-01), Kittl
patent: 3765820 (1973-10-01), Ito et al.
patent: 4090359 (1978-05-01), Doellner
patent: 4131413 (1978-12-01), Ryno
Dolnick Earl M.
Goldstein Mark K.
Kamen Noah
Quantum Group Inc.
Scott Samuel
LandOfFree
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