| 摘要 |
PURPOSE: A bell mouth structure for sirocco fan is provided to reduce the suction noise of the fan and improve function of the sirocco fan by improving the shape of bell mouth of the fan. CONSTITUTION: A sirocco fan(1) comprises a fan housing(2) arranged at the outer periphery of the sirocco fan; an impeller(3) installed within the fan housing, and which rotates so as to suck and discharge an air; an inlet port(4) formed at the fan housing; a diffuser(5) formed at the fan housing; and a bell mouth(6) formed at the inlet port side, and which guides the sucked air and protect the impeller. The bell mouth has a side cross sectional surface protruded from the fan housing so as to form an arc shape. The bell mouth has an inner front end located at the same plane with the outer side surface of the fan housing, or beneath the outer side surface.
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