Electric lamp and discharge devices – Spark plugs – Non-conducting material in or adjacent gap
Patent
1977-11-25
1979-02-27
Kominski, John
Electric lamp and discharge devices
Spark plugs
Non-conducting material in or adjacent gap
313131R, H01T 1352
Patent
active
041421213
ABSTRACT:
A surface-discharge igniter for a gas-turbine engine has a pellet of rod shape a part at least of the pellet surface being semiconductive so that when voltage is applied between electrodes connected at either end of the pellet it causes electrical discharge along its length. The pellet may, in one arrangement, be mounted to be a tight fit within the central-section of a key-hole bore which extends axially through a ceramic block within the igniter's outer metal shell. A strip of the pellet surface is exposed along the radially-divergent section or discharge cavity of the bore and discharge along the strip generates a plasma flame within the cavity that bursts forth through an aperture in the bottom electrode at the tip of the shell. In another arrangement the rod-pellet is mounted at the end of a mineral-insulated cable, coaxially within a cylindrical cavity. The pellet may alternatively be mounted to extend transversely of the igniter and to be exposed along its length at the operative tip of the igniter. Discharge may occur over the whole of the pellet surface, but the active semiconductive surface may be limited to a longitudinal or helical strip.
REFERENCES:
patent: 2735143 (1956-02-01), Laird
patent: 2870376 (1959-01-01), Tognola
patent: 2981860 (1961-04-01), Suter
patent: 2988663 (1961-06-01), Rademacher
patent: 3014151 (1961-12-01), Segall
patent: 3037140 (1962-05-01), Schurecht
patent: 3538372 (1970-11-01), Terao
patent: 3995184 (1976-11-01), Insley
Kominski John
Smiths Industries Limited
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