| 摘要 |
A cooling fan for rotating machine having a sufficient cooling performance, mass production performance and easiness in mounting is provided. A centrifugal fan mounted to a rotating shaft 21 of rotating machine for introducing a cooling air to the rotating machine, is provided with a hub 12 mounted at the rotating shaft, a main plate 11 formed in ring shape and disposed concentrically at the hub, a side plate 14 in ring shape having the outer circumference smaller than the inner circumference of the main plate and formed integrally with the hub so that it is disposed with an interval to the main plate in the axial direction of the rotating shaft, and a plurality of impeller blades 13 implanted on the hub and disposed along the axial direction of the rotating shaft and regularly in the radial direction so as to connect the main plate to the hub to form a space between the main plate, the side plate and the hub, some impeller blades 13 a of said impeller blades being constituted to reach the outermost circumference portion in the radial direction, while the others 13 b reaching only the middle, wherein the main plate and the side plate are formed so that they are not overlapped with each other when seen from the axial direction of the rotating shaft.
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