Propeller fan, blower having a propeller fan, an air conditioner having a propeller fan, the outdoor unit having a propeller fan, and, for water heater outdoor unit provided with a propeller fan
2013
It is possible to achieve both high efficiency by increase in the air flow rate blowing with noise reduction due to the leakage flow suppressing airflow, a propeller fan 1, and a boss 2 which includes a rotation axis O, a plurality provided on the outer periphery of the boss and the wing 3 and a bell mouth 9 disposed so as to surround a plurality of blades with trailing edge side of each respective wing in the radial direction of the cross-sectional shape, the bent portion 13 bulging on the upstream side of the air flow the has, as viewed in blade sections, and LQ tangent at the outer edge, the imaginary line perpendicular to the rotational axis O and LO, outer peripheral edge tangent angle an angle with their tangent LQ and the imaginary line LO forms mutually θ and when, the site where the peripheral edge of the virtual plane and the wing including the position of the end portion of the suction side of the bell mouth intersect, when the wrap start point, than the blade section comprising a wrap start point of the trailing edge side more of the outer circumference end tangent angle θ is, wrap open It is set to be smaller than the outer peripheral edge tangent angle θ of the front edge side of the blade section which includes the starting point.
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