| 摘要 |
PROBLEM TO BE SOLVED: To prevent the crack and melting loss of a front wall portion, and crack and welding due to molten metal. SOLUTION: A guide passage 17 is formed on the bottom of a bock body 12 for guiding combustion air from the rear part to the front part, and a nozzle port 20 is formed at the front end of the guide passage 17 passing through the block body 12 and opening to a combustion plane to inject the combustion air upward, On the rear side of the nozzle port 20 of the guide passage 17, a partition portion 21a is protruded to form an introduction passage 18 to the nozzle port 20 between an inclined inner face 13c of the front wall portion 13 and itself. The combustion air to be guided to the guide passage 17 is bypassed downward by the partition portion 21a and then introduced into the introduction passage 18. COPYRIGHT: (C)2009,JPO&INPIT
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