| 摘要 |
PROBLEM TO BE SOLVED: To provide a gas combustion device reducing fan noise or power consumption while securing a required amount of from a blowing fan, even in a forced exhaust type gas combustion device. SOLUTION: A scirocco fan constitutes the blowing fan, and an impeller 7 formed of forward curved vanes 73 is disposed to the blowing fan. A ratio of an inside diameter of the vane 73 with respect to an outside diameter thereof is set to be 0.55-0.77, and an angle of the vane is set to be 10-25 degrees. An outlet angle of the vane is set to be 100-180 degrees, an inlet angle thereof is set to be 45-135 degrees, and the vane is a recess curved toward a rotation direction of the impeller. COPYRIGHT: (C)2005,JPO&NCIPI
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