Combustion – Timer – programmer – retarder or condition responsive control – By combustion or combustion zone sensor
Patent
1996-04-23
1996-12-17
Williams, Hezron E.
Combustion
Timer, programmer, retarder or condition responsive control
By combustion or combustion zone sensor
431 86, F23N 500
Patent
active
055846793
ABSTRACT:
Gas leakage protection apparatus includes a pressure-differential sealing device and a thermal electricity converting device installed at a burner head for converting the heat of the fire into electric energy which is supplied to a solenoid valve at a bottom of a body to ensure smooth flow of gas through an opening of a gas duct. When the fire is out, the temperature drops so that the converting device cannot supply energy to the solenoid valve, causing the opening to be blocked and gas cut off. The pressure-differential sealing device consists of two interlocking L-shaped connecting tubes. A control element having a small-diameter inner bore and a large-diameter inner bore is disposed in one of the connecting tubes. The wall of the large-diameter inner bore is circumferentially provided with multiple holes. A control rod having a bottom flange fitted with a washer is disposed inside the inner bores of the control element. Under normal circumstances, gas passes through the multiple holes of the control element. But when the gas pipe cracks and the gas pressure increases as a result, the control rod will displace upwardly to seal the gas path, stopping gas leakage.
REFERENCES:
patent: 3764181 (1973-10-01), Friedrich
patent: 5181846 (1993-01-01), Chang
Klein David I.
Politzer Jay L.
Rosenberg Morton J.
Williams Hezron E.
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