| 摘要 |
PURPOSE:To prevent uneven red heat of an external flame cylinder, by a method wherein an annular glass fixer is fitted in a gap between an upper end of the external flame cylinder and a plurality of air vents is provided almost evenly on the glass fixer. CONSTITUTION:An external cylinder 3 surrounding the circumference of the lower part of an external flame cylinder 2 is secured concentrically to an internal and the external flame cylinders 1 and 2 through a cross pin 4. The external circumference of the upper part of the external flame cylinder 2 is surrounded by a transparent cylinder 5 made of glass fitted to a flange part 6 at the upper end of the external cylinder 3. An annular glass fixer 7 is installed by fitting the same in a gap between the upper end of the transparent cylinder 5 and the upper end of the external flame cylinder 2, and an air vent 8 is provided almost evenly. Thus, the air pressure of the inside of the internal flame cylinder is well balanced with that of the outside of the external flame cylinder and uneven red heat of the external flame cylinder is prevented. |
