| 摘要 |
PROBLEM TO BE SOLVED: To provide a propeller fan capable of suppressing a centripetal stream and improving air blowing performance. SOLUTION: A part where an air passage 6 of a shroud 2 surrounds the peripheral direction of a rotary vane wheel 3 becomes a circle, but a plate-like projection 4 in this invention is erected on the surface of a vane on the negative pressure side of the rotary vane wheel 3 which becomes a position on a concentric circle with the circle. Air peeld off from the surface of the shroud 2 due to the plate-like projection 4 is prevented from flowing an inner side more by the plate-like projection 4 and pushed into the downstream side in the axial direction of the rotary vane wheel 3 by the nearby vane. The plate-like projection 4 is erected by facing the axial direction of the rotary vane wheel 3 at an angle at which it becomes parallel with the internal wall of the part where the air passage 6 of the shroud 2 surrounds the peripheral direction of the rotary vane wheel 3 or more from the surface of the vane 8 on the negative pressure side. If a part from a vane front fringe to a vane rear fringe is 100% chord (100% vane chord length), it is ideal that the plate-like projection 4 is formed in such a way that the protrusion of the plate-like projection 4 starts at a position of 0 to 20% chord from the vane front fringe, and its height is smoothly increased up to the vane rear fringe. COPYRIGHT: (C)2007,JPO&INPIT
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