| 摘要 |
PURPOSE: A multiblade blower is provided to reduce noise from vibration of a wheel, and to improve blowing efficiency with an inner/outer air selecting door guiding inner air from an inner air inlet vertically to the wheel. CONSTITUTION: A multiblade blower is composed of a case(1) having a cylindrical blowing chamber(200), an inflow chamber(100) communicating the blowing chamber, inner and outer air flow ports(11,12) inclined to each other on the inflow chamber, and a guide unit(12a) extended obliquely from an opening of the outer air flow port and having a horizontal opening; a planar inner/outer air selecting door(2) curved to the outer air flow port, hinged by the case between inner and outer air flow ports, and selectively opening inner and outer air flow ports with turning around the hinge shaft; a driving motor(4) installed in the lower part of the blowing chamber; and a multiblade fan(3) combined with a driving shaft(40) of the driving motor, and generating centrifugal air flow with rotating by the driving motor. Inner air flows through the inner air flow port into the inflow chamber by a curved section(2a), and into the blowing chamber by spreading to an inlet ring(5) with converting the direction vertically owing to the inner/outer air selecting door curved to the outer air flow port. The operation noise of the multiblade blower is eliminated from vibration of the multiblade fan with operating pneumatic pressure on the multiblade fan evenly.
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