Patent GB-237587-A (GB)
Title: Improvements in and relating to liquid fuel burners
IPC: F23D11/00
Filed: 1925-07-06
Abstract: 237,587. Lang, A. July 28, 1924, [Convention date]. Spray burners; liquid-fuel supply. - A liquidfuel burner operating with air at' a low substantially constant pressure comprises a fuel nozzle 23 fitted with a regulating needle 24 and arranged in a casing 6 attached to the frame 5 of the heating apparatus, a lining 8 formed with air ports 7 and arranged in the casing, a hollowpiston valve 10 formed with air ports 11, 13 and slidable in the lining 8, a primary air cone 15 and a supplementary air cone 14 secured in the piston valve 10, and an air injector cone 9 secured in the lining 8. The piston valve is moved in the lining 8 against the resistance of a spring 22 by means of a lever 20 on a spindle 19 which carries an arm 18 attached by a rod 17 to a strap 16 on the valve. When the piston valve is in the position shown, a maximum suction is exerted by the air supplied through the inlet 12 on the fuel nozzle 23 and a maximum amount of supplementary air passes through the registering air ports in the piston valve and lining. When by the operation of the lever 20 the piston valve moves forward the suction on the fuel nozzle diminishes and the supplementary air supply is also diminished by the ports 7, 13 ceasing to register, the port 11 remaining open. The lever 20 is actuated by a thermostat 28 which also controls the height of an overflow tube 29 arranged in a chamber to which the fuel is continuously supplied in excess and to which the fuel nozzle 23 is connected by a pipe 33. Specification 201,167 is referred to. The Specification as open to inspection under Sect. 91 (3) (a) describes a liquid-fuel burner shown in Fig. 1 (Cancelled), comprising a tube 6 arranged in a casing 11 and carrying a fuel nozzle 5 fitted with a regulating member 7, an axially-adjustable primary air injector cone 18 fixed to a tubular support 17 formed wit'h air inlets 23, and a supplementary air cone 26 attached by arms 25 to a ring 24 which is slidably mounted on the support 17 and is pressed toward a stationary cone 27 at the entrance to the combustion chamber, by a coiled spring 28. The casing 11 is hinged to a base plate 32 attached to a casing 34 to which air is supplied through a tangential pipe 35. The passage of the air through the cone 18 induces a flow of fuel through a tube 10 to the nozzle 5 from a chamber 12 arranged below the casing 11. Fuel is maintained at a predetermined level by means of an overflow 14. The tube 10 passes through a slot 21 in the support 7 into a sleeve 9 surrounding the tube 6 and registers with a port in the tube 6. The tube 6 may be turned by means of a handle 16 so as to cut off the fuel supply. The crosssectional area of the air passage around the nozzle 5 and the widths of the air inlets 23 and slot 21 are so dimensioned that. with a substantiallyconstant air pressure, the suction at the fuel nozzle has a maximum value when the cone 17 is in the end position shown in Fig. 1 and a minimum value in the other end position in which the cone 26 is in contact on one side with the cone 18 and on the other with the cone 27 so as to cut off completely the supply of supplementary air. This subject-matter does not appear in the Specification as accepted.