| 摘要 |
PURPOSE:To suppress the burning case from generating a creaking noise at the minimum level even when the burning case is expanded toward longitudinal direction due to a radiation heat by a method wherein the burning case is formed so that the only one part of a main plate in the longitudinal direction thereof is contacted to a side plate. CONSTITUTION:At the thermal expansion of a burning case 11 in longitudinal direction caused by the conducted heat from a flange frame of a small burner 9 and a large burner 10, and by the radiated heat from a flame, as the result of the contacting of only a convex-shaped claw 13 of the main plate 15 to a surface A17 of a side plate 20, a creaking noise generated by burrs on an end surface of the main plate 15 can be prevented at the minimum level. The thermal stress strain caused by the thermal expansion difference between the main plate 15 and the side plate 20 can be absorbed by the calling of the claw 13 in a slit hole 16 of the surface A17. Further, since the surface 19 of the side plate 20 is contacted with an inner body of a burning chamber 14, the burning chamber 14 is prevented from the flowing-into of an air other than the primary air, accordingly, the burning stabilization can be contrived, and the operation of an incomplete burning preventing device 27 can be stabilized.
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