| 摘要 |
PURPOSE:To be able to enlarge the range of adjusting combustion amount and increase in radiation heat at a red-heat zone by forming ventilation holes, a flame adjusting part and a flame holding part in such a manner that the holes are bored on a secondary flame ring and air flows upward through the holes. CONSTITUTION:The secondary flame ring 19 has ventilation holes which lead air from an air path 20 to the upward direction of the ring and has also the flame adjusting plate 22. At the upper end of the red-heat zone, the flame holding part 23 is installed projecting in the combustion chamber 8 in such a way that the part 23 is formed as one body with the ring 19 by being bent horizontally using the inside edge of the ring 19 and its place is made lower than that of the ventilation holes 21. Around secondary flame formed at the secondary flame hole part 12, combustion reaction is promoted by air from the ventilation holes 21 and homogeneous flame is made by sufficient mixing via the flame plate 22. As the flame adjusting part 14 and flame hole part 23 are projected, flow resistance becomes large and combustion amount in the combustion chamber 8 becomes small. Therefore, in case of reducing the combustion amount, it is not necessary to reduce the height of the combustion chamber 8 and large radiation heat is obtained. Thus, wide range of combustion amount is obtained.
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