| 摘要 |
PURPOSE:To permit red heat of an opening hole part having uniform and high temperature and rise heat radiation efficiency by a method wherein the opening hole part having a nearly same width for the secondary flame port width is separated from the unopening hole part of both sides thereof at a middle upper part at least, with respect to the secondary heat body. CONSTITUTION:The secondary red heat body 20 is constituted of the opening hole part 20a having a nearly same width for the width of the secondary flame port 18 and the unopening hole part 20b of the both sides thereof. And, they are separated by a slit type kerf 20c provided at the middle upper part of the both of them. It is accepted that the opening part 20a and the unopening part 20b are arranged in parallel as different members instead of the kerf 20c and they are engaged with a U-shaped bearer at the upper and lower ends thereof. According to this method, the red heat of the opening hole part having the uniform and high temperature may be effected and the heat radiation efficiency may be risen.
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