| 摘要 |
PROBLEM TO BE SOLVED: To provide a combustion air supplying device capable of surely decreasing or deadening combustion resonance noises by a simple device structure. SOLUTION: The combustion air supplying device comprises a fan case 1 having a rotary vane 2 with a plurality of vane parts 5 centrifugally blowing air toward its radius direction by rotation, a rotary shaft 3a interlockingly connected to the rotary vane 2, a suction port 7 that surrounds the rotary vane 2 and sucks air in the rotary shaft center direction of the rotary vane 2, and an exhaust port 8 exhausting air in an roughly tangential direction of the rotation peripheral direction of the rotary vane 2, and a drive mechanism 3 driving the rotary shaft 3a. In a high pressure region in an air channel that reaches the rotary vane 2 from the suction port 7, a shield object 9b shielding a part of the air channel is extendedly provided toward the inside of the fan case 1 from the suction port 7, and the shielding object 9b is position-alterably and fixably provided in the rotation peripheral direction of the rotary vane 2.
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