IMPROVEMENTS RELATING TO AIR ATOMIZED LIQUID FUEL BURNERS FOR PREHEATING VAPORIZERS IN LIGHTING HEATING AND COOKING APPLIANCES BURNING LIQUID FUEL

摘要

711,799. Starting devices for vapour burners. GRAETZ, F., and GRAETZ, E. May 7, 1951 [Sept. 19, 1950], No. 10666/51. Class 75 (1) An air-atomizing liquid fuel burner for preheating vaporizers in vapour burning apparatus comprises an air-fuel mixing chamber into which opens a liquid fuel jet and one or more compressed air supply duct or ducts and from which the air-fuel mixture is discharged through a further jet, and by rotating an adjusting member to vary the size of the mixing chamber the rate of supply of compressed air is variable independently of the rate of fuel supply. The preheating burner may comprise a body 1, Fig. 1, which is screwthreaded into the top of a fuel container (not shown) so that a fuel feed pipe 6 depends into the fuel, the upper end of the pipe 6 being threaded into a tube 3 which carries a cap 7 having a fuel discharge jet 8. Compressed air is supplied from the space above the fuel in the container through the annular space between the tube 3 and the body 1 past flats on the sides of a lock nut 9 for locking the tube 3 in position, of the lower end of the tube 3, and of the cap 7 to a mixing chamber formed between the cap 7 and an outer cap 10 in which is provided the burner outlet orifice 11. The tube 3 is screw-threaded into the body 1 and is provided with a screw driver slot in its lower end whereby the spacing between the caps 7, 10 and thus the rate of air supply may be adjusted. A pivoted snuffer 13 is clamped to the body 1 by means of a nut 14. Apparatus for pre-determining the most suitable position for the tube 3 is illustrated in Fig. 7. The burner body 1 is threaded into a spigot 44 in the top of a fuel container 43, the nut 9 having been removed, and the slot in the lower end of the tube 3 is engaged by the blade of a screwdriver having a tubular shank 50 which is connected to a spindle 47 passing through a gland 46 in the base of the container 43 and having an operating knob 48, Compressed air is supplied to the tank 43 through a nipple 52, and a pressure gauge 53 is provided. In an alternative preheating burner construction the fuel jet tube 18, Fig. 4, is movable relatively to the burner body 16 by a screw 21 which when screwed inwards bears against the inclined face of a groove 20 in the tube 18 to move the latter upwardly against the action of a spring 19. The fuel orifice 25 is formed in the end of the tube 18, and air passes through a groove (not shown) in its outer surface to the mixing chamber formed between the end of the tube 18 and a cap 26 in which is provided the burner outlet orifice 27. In another construction the size of the mixing chamber and thus the rate of air supply is controlled by turning the end cap which is threaded on the burner body. In any of the constructions the burner outlet orifice may, alternatively, be provided in a disc separate from, but clamped to, the burner body by the end cap.