| 摘要 |
PURPOSE:To contrive the performing of sufficient burning correspond to the change in the amount of burning of the titled device by a method wherein the producing of a yellow flame, a rising flame and the lift of a flame is restrained by means of forming the wall surfaces of the inner and outer cylinders as recess- convex shape in circumferential direction. CONSTITUTION:The recess-convex shape part 13, 14 which is provided on the at least one cylinder either of an inner flame cylinder 7 or an outer flame cylinder 9, is extended to the top of said inner flame cylinder 7 or said outer flame cylinder 9. Thereby, the superficial area of the secondary flame is increased, the superficial area contacting the air is increased, the flame maintaining efficiency is also improved. Accordingly, the flame is stabilized, a yellow flame, a rising flame, and the lift of a flame is restrained, the burning range is extended. |
