| 摘要 |
PROBLEM TO BE SOLVED: To improve heat efficiency without deteriorating heat distribution by preventing an increase in length of a flame in an upper stage flame hole without any increase in outside diameter of a burner head in a burner for a cooking stove in which a number of flame holes 6U, 6L of two upper and lower stages are provided at intervals in the circumferential direction on the peripheral surface of the burner head 5, and gaseous mixture having an excess air ratio under 1 is supplied to the flame holes of the upper stage and the flame holes of the lower stage from the individual mixing tubes 7U, 7L, respectively. SOLUTION: An excess air ratio of gaseous mixture supplied to the flame holes 6U of the upper stage is set larger than that of the gaseous mixture supplied to the flame holes 6L of the lower stage. Preferably, the excess air ratio of gaseous mixture supplied to the flame holes 6L of the lower stage is set smaller than 0.7, and that of gaseous mixture supplied to the flame holes 6U of the upper stage is set equal to or more than 0.7. COPYRIGHT: (C)2009,JPO&INPIT
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