Patent GB-238912-A (GB)
Title: Improvements in or relating to controlling apparatus for burners
IPC: F23N5/24
Filed: 1924-02-27
Abstract: 238,912. White, A. E., (Socony Burner Corporation). Feb. 27, 1924. Electrically controlling fuel and air supplies; spray burners; oil-supply fittings. - A burner - controlling apparatus comprises a motor 15 for supplying the burner, which motor is controlled by a motor 48, controlled by a safety switch responsive to the conditions in the burner chamber 1. The motor 15 operates a fan 8 and a pump 26, which supplies air, preferably from the fan chamber, through a pipe 6 to a jet 5 for supplying liquid fuel from a pipe 4 and spraying it through a nozzle 3, additional air passing from the fan through a passage 10 and around an ignition cone 13 to the chamber 1, which is provided with a restricted outlet 2 and is surrounded by a shell 32. An opening 33 in the latter is covered by the safety switch, which consists of a hinged plate 34, weighted by a screw 36 and provided with terminals 39, 44, opposite fixed insulated terminals 40, 45 respectively. The motor 48 is connected through gearing 49 to a shaft 50 having a cam 52 on which rides a wheel 55 on a pivoted arm 53. Electric leads 70, 69 are connected respectively to a terminal 57 on a spring arm 60 and through the motor 15 to a terminal 56 on the arm 53 so that, when the latter is raised by the part 58 of the cam 52, against the action of a spring 59, the terminals 56, 57 are brought into contact and the motor 15 is operated. The shaft 50 carries a plate 88 adapted to bridge pairs of terminals 83, 84; 85, 86 ; and 86, 87, the terminals 84, 87 being connected by a wire 84<a>. The leads 69, 70 are connected to a transformer 118, the low-tension side of which is connected through a circuit-breaker 124, a condenser 126. and a sparking-coil 129 with a sparking-plug 7, and to the motor 48, the latter circuit including a magnetic switch 93, 94 controlled by a coil 96, connected through the low-tension side of a transformer 97 to the terminal 84 and to a manually-operated switch 77. The pivoted arm 84 of the magnetic switch, as shown in Fig. 2a, is weighted at 94d and is provided with an extension 94<e> adapted to engage a shoulder 94<h> on a pivoted lever 94f to lock the switch in closed position during the passage of the plate 88 from one pair of terminals to another, the lever 94f being lifted bv a stud 94j on a disc 94<k> on the shaft 50 out' of engagement with the extension 94<e> when the plate 88 is in position to bridge a pair of terminals. A switch 80 operated by an arm 79 of a thermostat, subjected to the heat produced by the burner, is provided. With the terminals 56, 57 in contact, the plate 88 is over the terminals 83, 84, the plate 34 is swung outwardly by the pressure in the chamber 1 and the switch 80 is inoperative or in contact with a terminal 81, so that no current flows through the coil 96 and the burner, under normal conditions, continues to operate until the thermostat is heated sufficiently to bring the switch 80 into contact with a terminal 82. Then a circuit is completed through the plate 88, arm 79, switch 77, and coil 96, which closes the switch 93, 94 and the motor 48 moves the plate 88 anti-clockwise until it bridges the terminals 84, 85. A circuit is then completed through the coil 96, plate 88, terminals 44, 45, and switch 77, and the plate 88 continues to move until it bridges the terminals 86, 87 when the burner remains in operation until the switch 80 is brought into contact with the terminal 81 by the cooling of the thermostat to close a circuit through the coil 96 and thus bring the plate 88 over the terminals 83, 84. When the pressure in the chamber 1 is reduced by a failure of the fuel supply, or a failure in ignition, the plate 34 is swung inwardly by the weight 36, and the terminals 39, 40 being brought into contact, a circuit is established through the coil 96, plate 88, terminals 39, 40, plate 34, and switch 77 and the plate 88 is brought over the terminals 84, 85, when the burner is stopped. To restart the burner, the switch 77 is pushed inwardly to close a circuit through the coil 96 and thereby move the plate 88 over the terminals 86, 87. The plate 88 remains in this position until the switch 77 is released and the switch 80 is in contact with the terminal 81. The air pipe 6 comprises a chamber 135 having an outlet 137 normally closed by a gravity-actuated valve 138, an armature 139 mounted on the stem of the valve being adapted to be lifted by a coil 140 in shunt circuit with the mot'or 15 so that the air and fuel supplies are cut off immediately the motor 15 is stopped. Specification 238,913 is referred to.