GB219067A - A water heater or steam generator adapted to be fired by liquid or gaseous fuel - Google Patents

Abstract

219,067. Pattison, C. M. April 12, 1923. Electromagnetic interrupters. - The supply of liquid or gaseous fuel to a water heater or steam generator is controlled automatically in accordance with the temperature of the atmosphere or water or the temperature or pressure of the steam by using a thermostat or pressure gauge to operate an electric relay and set in motion a motor driving a fan which induces a combustible mixture of air and gas in to a combustion chamber where it is fired, the products being then drawn through a flue passing through the water heater &c. The pointer 30 of a thermostat or pressure gauge 27 is adapted to make contact with one or other of the adjustable arms 28, 29 and complete an electric circuit including one or other of the solenoids 31, 32 having cores 49, 50 mounted on a rocker arm 36. Upon a fall of temperature or pressure the solenoid 31 is energized to operate the core 50 and rocker arm so as to cause the fork 59 to dip into mercury pots 60 and complete the main circuit of the motor 25 operating the fan 24. The movement of the rocker arm 36 also causes a ball 52 to pass to the opposite end of the tube 51 and engage with the arm 56 to break the electric contact 54 in the solenoid circuit. The suction side of the fan 24 is connected by a pipe 46 to a chamber 43 containing a liquid and connected to a chamber 44 containing a float 45 adapted to rise and fall with the liquid in the chamber and operate a gas supply valve 62. Suction produced by the fan causes gas to pass from the pipe 63 to a burner 20 where it is ignited by a sparking-plug 21 connected to a magneto 47 driven from the motor 25. The burner 20 vaporizes the liquid fuel in the chamber 17, supplied from the chamber 15 through a pipe, and the vaporized fuel passes into the air conduit 14 and is drawn with air through the gauge 2 to a nozzle 22 where it is ignited by a Sparking-plug 48 and burns in the combustion chamber 3. The combustion products are drawn by the fan 24 through the elliptical flue 5, provided with fins 11, adapted to radiate heat to the water in the boiler 4, and thence through flues 7, 23 to the fan outlet 26. In an alternative arrangement the gas may be supplied direct to the combustion chamber instead of to the burner 20.