| 摘要 |
PURPOSE:To prevent a flame from extending outside a device, by a method wherein a panel for preventing the production of an upright flame is located above a flame spreading panel and separately from the latter panel in a manner that the former panel covers an upper part of a gas between an outer shell of a combustion cylinder and an inner or an outer flame cylinder. CONSTITUTION:A plurality of leg parts 14 are located above a flame spreading panel 13, and a panel 15 for preventing the production of an upright flame, positioned above gaps between inner and outer flame cylinder 10, 11 and the outer flame tube 11 and an outer shell 12, is separately installed. This constitution causes a flame, naturally growing into a large upright flame, to move outwardly by dint of the panel 15, whereby an upright flame 16 decreases in height and is well mixed with secondary air, which results in reducing a quantity of an upright flame itself and in maintaining the safety. The narrower a gap A between the panel 15 and the outer shell 12 is, the more favorable it is for the prevention of the occurrence of an upright flame, but reversely, the larger a pressure loss is, which results in causing a turbulence of combustion, e.g., the reduction in a quantity of combustion heat, an increase in carbon monoxide in combustion waste gas, the production of a combustion noise due to a lift phenomenon of a flame, whereby the gap is decided from two factors of the prevention of the occurrence of an upright flame and the combustion properties. |
