GB389181A - Improvements in electrical ignition means for oil burners - Google Patents

Abstract

389,181. Electrically controlling oil burners. GILBERT & BARKER MANUFACTURING CO., Cold Springs Avenue, West Springfield, Massachusetts, U.S.A. Nov. 14, 1931, No. 31602. Convention date, Nov. 28, 1930. [Classes 75 (i) and 75 (iii).] In an electric control system for oil burners having an oil spraying device an electrical ignition device comprising spark electrodes, is continuously in action while oil is being supplied, but the relatively heavy current during the starting period is automatically reduced after ignition is effected. The ignition device comprises spark electrodes 5 adapted, on the starting of the oil flow, to be fed by the secondary coils of transformers 9, 10 connected in parallel. This produces the comparatively heavy current required for vaporizing and igniting the fuel, but after ignition the electrodes are fed by the transformer 10 only, the smaller current thus obtained being sufficient to anchor the flame to the burner nozzle and keep the electrodes clean. The starting of the burner is controlled by a thermostat 15 adapted to close a low voltage circuit supplied by the secondary 17 of a transformer connected across supply mains 18, 19. On the closing of this circuit, solenoids 20 and 33 operate switches 14 and 41, the former closing a circuit from the supply mains through the primary of the transformer 10 and also through a motor 13 controlling the oil flow to the burner, and the latter, through the primary of the transformer 9. Interposed in the lead to the solenoid 33 is a time limit switch adapted to break the circuit and thus open the switch 41 after the starting of the burner. As shown, the time limit switch consists of a bimetallic thermostat 35 subject to the heat from a coil 38 which is energized simultaneously with the solenoids. Alternatively the time limit switch may be a thermostat responding to the temperature of a furnace in which the burner is situated.