| 摘要 |
PURPOSE:To achieve stable and high burning performance by arranging air smoothing holes at one end of a blow tube to be distributed in an area where the size of opening is larger and an area where the size of opening is smaller in correspondence with the static pressure distribution in a fan case. CONSTITUTION:When the start switch is turned ON, a fan 21 rotates to cause combustion air to flow to the burner head and, after being smoothed by air smoothing holes 30 in the bottom 30 of a blow tube 27, further to a combustion area 29. The dynamic pressure distribution in the B-B' section of the fan case 22 is such that it is higher at the upper left corner in the bottom of the tube 27 and is lower toward the lower left corner. Based on the Bernoulli's principle, the static pressure is low at the upper left corner of the bottom of the tube where the dynamic pressure is high, and the static pressure is high at the lower left corner of the bottom. On the other hand, the air flow rate flowing into the air smoothing holes 30 is higher where the static pressure is higher. Because the number of the air smoothing holes 30 is larger at the upper left corner of the bottom of the tube 27 and smaller at the lower left corner, the air flow rate flowing into the tube 27 becomes uniform, and the flame in the combustion area 29 becomes stable, thereby enabling high burning performance.
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