| 摘要 |
PURPOSE:To raise red heat temperature of a red hot body to prevent unevenness in the red-heating by providing a projection at the upper section of an internal flame cylinder and a red hot body on the upper section of the projection and at the same time extending a penetrating cylinder higher than the red hot body. CONSTITUTION:The periphery of the top plate 7 of an internal flame cylinder 2 is extended towards outside to provide an extension section 7a. A red hot body 8 of cylinderical shape is provided above the end section of this extension section 7a. The red hot body 8 is provided with a plurality of penetrating holes 8a or notches. The upper end of a red hot section 9 is provided with secondary flame rings 10 the inner periphery of which projects into a combustion chamber 4. The upper end of this secondary flame ring 10 is provided at a position lower than the extension section 7a of the top plate 7 in the internal flame cylinder 2, and the outlet of the combustion chamber 4 is constituted between them, and there a secondary flame 11 is formed. Penetrating cylinders 13 which consist of heat-resistant glass cylinders are installed on the upper section of an external cylinder 12. Penetrating cylinders 13 extend higher than the red hot body 8, and a secondary combustion chamber 16 is formed above the red hot body 8.
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