Patent GB-231514-A (GB)
Title: Improvements in installations for supplying liquid fuel to burners
IPC: F23K5/02
Filed: 1925-03-26
Abstract: 231,514. Soc. Anon. Ing. P. Kind & Co. March 26, 1924, [Convention date]. Spray burners; oil supply and overflow fittings; oil reservoirs.-In an installation for the combustion of liquid fuel, the beat generated in the mechanical parts such as the air compressor and the electric or other motor driving the air compressor is used to preheat the fuel before atomization. In one form of apparatus the fuel is introduced directly into the compressor air intake and flows with the air along a conduit to the burner where atomization takes place. The air compressor and its driving motor may have a common shaft or common framing so as to communicate to the air the heat generated in the motor. In another form shown in Fig. 2, the rotary air compressor 1 and its driving motor 2 are mounted on the fuel tank 10, the motor being arranged in a casing forming the air intake to the compressor. The air delivery pipe 5 from the compressor passes through the fuel tank to the burner 4. The fuel pump 16 is arranged within the fuel tank and forces the fuel either directly into the pipe 5 or through a pipe 19 into the compressor intake. The compressor shaft carries a cam 17 operating the pump plunger against the resistance of a spring 18. The output of the pump may be adjusted by means of a lever 20 which limits the plunger stroke. The lever 20 may also operate a valve 21 in a by-pass 22 connecting the pipe 5 with the compressor intake so as to regulate the air supply simultaneously with the fuel supply. The position of the lever 20 is indicated on a scale 24 by a pointer 23. The tank 10 is filled either through an opening 12 or through an opening 13 in the air compressor jacket 14, the fuel level being automatically controlled by a float-operated valve 11. An orifice 15 in the top of the tank 10 enables leakage to be returned to the tank. The burner 4 comprises a conical nozzle 36, Fig. 4, connected to the pipe 5 by an electric insulator 37 and containing a cone 39 formed with helical grooves intersected by an annular groove 40. A sharp-edged orifice 38 is provided at the end of the nozzle. In another form shown in Fig. 3, the tank 10, compressor 1, and motor 2 are enclosed in a heat-insulating casing 25. The air intake 8 to the casing is fitted with a valve 30 having an arm 29 and the fuel supply pipe 26 to the tank 10 is fitted with a valve 27 having an arm 28. The arms 28, 29 are operated by a rod 31, which is connected to the switch 32 of the motor 2 and to a flexible spring-pressed diaphragm 33 subject to the air pressure in the burner supply pipe 5 so that if the motor stops the fuel and air supplies are automatically cut off. A heating resistance 35 arranged in the casing 25 is supplied with current when the switch 32 is operated to break the motor circuit. Instead of the piston pump a rotary pump comprising vanes radially movable in a rotating disc may be used. The vanes engage a ring forming the outer wall of the pump chamber and connected to a spindle eccentrically mounted on the shaft of the disc so that the output of the pump may be varied. The Specification as open to inspection under Sect. 91 (3) (a) comprises also an apparatus in which the oil is supplied to the burner through a pipe enclosed in or having a wall in common with the air supply pipe. This subject-matter does not appear in the Specification as accepted.