GB1049551A - Oil burner - Google Patents

Abstract

1,049,551. Liquid fuel burners. MASTER CONSOLIDATED Inc. April 7, 1965 [April 8, 1964], No. 14747/65. Heading F4T. A liquid fuel burner comprises a motor 14 driving a fan 18 and a compressor 21, the fan supplying air to a perforated combustion tube 72 and to a recess 44, Fig. 6, which is formed in a burner head 28 and into which projects an aspirating type fuel nozzle 61, the compressor 21 supplying air through a tubular filter 30, Fig. 5 (not shown), to a nozzle recess 34 also formed in the burner head 28 and leading to aspirating passages in the nozzle 61. The air is discharged by the nozzle and sucks fuel up to the nozzle through two regulators 49 arranged in series. Each regulator comprises a diaphragm 51 having a pin 51<SP>1</SP> adapted to tilt a spring biased arm 57 carrying a head 55 sealing a fuel inlet to the chamber below the diaphragm. The outlet of this chamber is connected to the fuel nozzle or to the inlet of the other chamber. The chamber above the diaphragm is open to atmosphere. The inlets to the chambers are opened in sequence by the suction of the aspirating air. The recess 44 surrounding the nozzle has a series of arcuately curved fingers 63 and the air is directed tangentially on to the roots of the fingers by angled slots 65 in the wall of the recess. The tubular air filter is disposed in a recess 29 in the burner head 25 having a pressure regulator comprising a spring urged ball 38, Fig. 2 (not shown), sealing a passage 37 from the recess. The air from the fan to the perforated combustion tube 72 passes into a housing 74 surrounding the combustion tube through apertures 71 in a cylindrical cap secured by a bayonet fastening to the burner head 28. The gap between the ends of the housing 74 and the combustion tube is bridged by an apertured disc-shaped flame spreader 76 and the space between the housing 74 and the combustion tube contains a deflector tube 73. All the air flows along the outside of the deflector tube 73 to the end thereof where a part of the air passes through the apertures in the flame spreader 76 and the rest reverses its flow and enters the space between the combustion tube and the deflector tube and then flows into the combustion tube to vaporize the atomized fuel from the aspirating nozzle. The intake to the fan is controlled by a rotatable valve plate 78 having apertures 79 which may be selectively aligned in part or in total with apertures 19 in the end wall of the burner housing. The compressor 21 comprises a disc-shaped rotor having radial slots accommodating sliding vanes 26, Fig. 3 (not shown), co-operating with an eccentrically positioned ring enclosure 22. The burner is ignited by a spark igniter 66. In a modification, Fig. 7 (not shown), the flame spreader is replaced by a tube 84 which is closed at its outer end and has outlet apertures 86 in its upper surface. In another modification, Fig. 8 (not shown), the flame spreader is replaced by a tube 89 having a right angled section 90 at its outer extremity over which a conical flame spreader 92, is mounted in spaced relationship. In still another embodiment, Fig. 9 (not shown), the flame spreader is replaced by an annular dish-shaped cap 98 fitted on the open end of the combustion chamber.