| 摘要 |
842,291. Gas burners. SHELL RESEARCH Ltd. April 18, 1958, No. 12381/58. Class 75(1). A gas burner comprises a head 1 having a nozzle 3 supplied with combustible gas through a conduit 10, means surrounding the nozzle 3 for causing air to rotate about the axis of the nozzle and a single control means for controlling simultaneously the supply of combustible gas and the rate of rotation of the air. The air is supplied by a conduit 11 to an annular chamber 5 interrupted by a ring 7 having inclined slots 8 which effect rotation of the air. The rate of rotation of the air is determined by its pressure which is regulated by two needle valves 9, 14. The combustible gas is regulated by a valve 19 operated by a diaphragm 17 the upper side of which is submitted to the air pressure between the two needle valves 9, 14. A set screw 23 abuts the diaphragm to prevent complete closure of the gas valve 19 when the air pressure is reduced. A conduit 21 supplies oxygen through the needle valve 22 to the gas conduit 10. |
