| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve air blowing performance in a blower having a curved part to the negative pressure face side in the whole rear edge region of a blade. <P>SOLUTION: The blower has an impeller 1 formed by radially mounting blades 3 to the outer periphery of a hub 2. The whole region of the rear edge 3b of the blade 3 has the curved part 4B curved to the negative pressure face 3f side, and a curve angle α of the curved part 4B is set to be gradually smaller toward an outer peripheral part 3d from an inner peripheral part 3c. By this constitution, the separation of an air current is large at the negative pressure face 3f on the inner peripheral part 3c side of the blade 3, but there is hardly generated any separation of the air current at the negative pressure face 3f on the outer peripheral part 3d side. The curve angle α is thereby set to be large at the negative pressure face 3f on the inner peripheral part 3c side to further effectively suppress the separation of the air current, and a back stream width can be kept small. Furthermore, since the separation of the air current is small at the negative pressure face 3f on the outer peripheral part 3d side, the curve angle α is set to be small to restrain the curved part 4B itself from becoming the resistance of a flow along the negative pressure face 3f to the utmost. Aerodynamic characteristics are improved by the synergistic effect of both to improve air blowing performance. <P>COPYRIGHT: (C)2010,JPO&INPIT |
