Electric heating – Heating devices – Resistive element: igniter type
Patent
1984-12-18
1985-12-03
Bartis, Anthony
Electric heating
Heating devices
Resistive element: igniter type
123145A, 219205, 219505, 361264, F23Q 700, F02P 1902, H05B 300
Patent
active
045567816
ABSTRACT:
A self-regulating electric glow plug for an air-compressing internal combustion engine includes an elongated tube having a first end arranged within a plug housing and a second closed end defining a tubular component adapted to extend into a combustion chamber of the engine to produce heat when heated to a glowing condition. A coiled electric resistance heating element is disposed entirely within the tubular component and is embedded in a mass of thermally conductive electrical filling the tube. The resistance element includes two oppositely wound resistance wire coils connected in an end-to-end serially connected array with the first coil being located closest to the glow plug housing and the second coil being located closest to the closed tube end. The first coil has a higher positive temperature coefficient of resistance than the second coil. The second coil defines a heating element for the combustion chamber of the engine and has the capability of heating the entire tubular component in which the coils are located to incandescence within three to five seconds after being energized. The first coil is thus affected not only by internal heat produced by the current flow through at but also by the heat from the tubular component heated to incandescence by the second coil so that the resistance of the first coil increases rapidly to reduce the initially high current flow through the serially connected coils and prevent overheating of the glow plug.
REFERENCES:
patent: 1948974 (1934-02-01), Talmey
patent: 2492755 (1949-12-01), McCollum
patent: 2672546 (1954-03-01), Klingner et al.
patent: 3023295 (1962-02-01), Johnson
patent: 3164748 (1965-01-01), Testerini
patent: 4107510 (1978-08-01), Tombs et al.
Bartis Anthony
Firma Beru-Werk, Albert Ruprecht, GmbH & Co. KG
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