| 摘要 |
A tubular burner includes a mixing tube and a flame hole member having a plurality of flame holes. The flame hole member is made of a sheet metal plate and has: a circular disk part having the plurality of flame holes formed therein; and a fitting tubular member which is elongated backward from a periphery of the circular disk part and is adapted to be fitted into an inner circumference at the front end region of the mixing tube. A clearance-generating section is formed at a front of the fitting tubular member so as to generate an annular clearance between the clearance-generating section and the inner circumference at the front end region of the mixing tube. A plurality of flame retention holes are formed in the clearance-generating section at a circumferential distance from one another. |
