GB516724A - Improvements in or relating to liquid fuel burners or liquid atomisers - Google Patents

Abstract

516,724. Spray producers; liquid fuel burners. GARNER SUBMICRON ATOMIZERS, Ltd., GARNER, W. R., and GARNER, A. R. May 30,. 1938, No. 16155. [Class 69 (iii)] [Also in Group XI] A liquid fuel burner or liquid atomizer comprises a nozzle in which a mixture of the liquid and air or other gas is first given a swirling movement and then caused to pass through a restricted passage as a film into a chamber formed with impact surfaces and a discharge outlet. In the form shown in Fig. 1, compressed air and liquid fuel supply connections 28, 35 screwed to a block 4 are connected by passages 27, 34 to a conical chamber 26 from which a. pipe 3 leads to a nozzle 6 mounted on a pipe 2 surrounding the pipe 3. The nozzle 6 is fitted internally with a member 5 formed with a conical head 8 and a conical recess 7. The mixture issuing from the pipe 3 enters the recess 7 and passes through helical or otherwise curved channels 15 to the annular chamber 14 surrounding the head 8. From the chamber 14 the mixture passes through a restricted annular passage to impinge on the channelled inner surface 9 of the nozzle and then issues as a finely swirling mist or spray through a central orifice 11 which is flared at both ends. The fuel supply may be regulated by means of a needle valve 31 having a flat face 32. The valve 31 may be unscrewed to allow the removal or blowing-out of solid matter blocking the supply channels. Fig. 2 shows another construction in which the spreader member 5 is formed by a helically-grooved cylindrical rear portion 37 connected by a conical portion 40 to a cylindrical portion 41 formed with a V-shaped peripheral channel 42 connected by tangential grooves 44 to a central recess 43 surrounding the boss 45 on the nozzle 6 in which the discharge orifice is formed. The nozzle 6 is externally threaded to carry a ring 51 on which is mounted a perforated cylindrical flame cowl 52. In a modification, the member 5 is pressed against the rear surface of the nozzle 6 by a spring and is formed on its rear surface with a valve regulating the mixture discharge from the pipe 3. In another construction shown in Fig. 5, a mixture of fuel and air are supplied through an inlet channel 74 in the atomizer body while a gas such as oxygen is supplied through an inlet channel 75 to a channel 79 in the member 5 discharging into the cavity 43 so as to minimize the danger of explosion. The nozzles may be arranged in line or in clusters and their impingement surfaces may be undercut. The projecting parts and restricted passages may be duplicated or triplicated to produce finer atomization.