| 摘要 |
PURPOSE: To reduce a rotational sound of low frequency according to rotation by tilting an individual blade at a prescribed angle in the same direction relating to an axial direction parallel line from one end disk leading to the other end disk of a plurality of the support disks, also arranging the blade by a random pitch in the peripheral direction. CONSTITUTION: A cross-flow fan 1 of an air conditioner has blades 2... which are a single sheet blade inserted through each support disk 3 from one end to the other end of a plurality of the support disks 3 arranged with an almost equal space in an axial direction of the fan. Each blade 2 is uniformly formed with a tilt, so-called skew, of advancing a drive side (motor 5 side) rather than a driven side (shaft 4 side) by a prescribed amount in a rotational direction U. The blade 2 is formed in a sectional shape bent to be tilted forward to a side of the rotational direction U, to arrange the many blades 2 in a peripheral direction aside the periphery of the support disk 3 by random pitches P1 , P2 , P3 , P4 ...P34 . This random degree δ (maximum pitch/minimum pitch) is selected to a prescribed value in a 1.2 to 1.5 range. |
