Fig. 135. Showing the Different Classes of Oil Burners.
Fig. F. Mixed Pressure Burner, Using Both Steam and Low Pressure Air.
Fig. G. Burner Used by the Pennsylvania Railroad Under Locomotives.
In the injector type of burner shown by Fig. B the air or steam nozzle terminates inside of a shell and is completely surrounded by the oil. A mixture of air and oil issues from main nozzle shown by (2). When the air or steam blows through the inner opening, a partial vacuum is formed in the space (1) which draws the oil into the burner from the supply pipe. On entering this vacuous space the oil comes into contact with the jet and is blown out through the opening (2) in the form of a spray. This vacuum is high enough to lift the fuel for a considerable distance without the aid of a pump and for this reason is the type most commonly met with in practice. A boiler or furnace equipped with this burner will lift the oil directly to the furnace from the reservoir in the same way that a feed water injector will lift water into the boiler. With the commercial injector, the position of the steam jet is made adjustable in relation to the main jet to meet different feed conditions. The steam enters the inner port through the end of the pipe shown at the right. The oil enters the outer port at the right through a port not shown.
Fig. H. Lassoe-Lovelsin Burner.
Fig. C shows a drip feed or “dribbling” burner in which the oil pours out of the upper port and over the lower port through which the steam or air issues. As would be expected, the atomization is not as perfect with this burner as with the atomizer or injector type.