| 摘要 |
PURPOSE:To augment sectional area and strength of a ring without narrowing the outside diameter and the exit of a sirocco fan and ease metal mold blanking by radially and projectingly providing blades on the outer periphery of a disc and further providing the ring on the blade ends so as to join the blades. CONSTITUTION:Blades 2 are radially and projectingly provided on the outer periphery of a disc 1 and a ring 3 is provided on blade ends to join the blades 2. Due to this structure, sectional area of the ring 3 is largely increased and its strength can also be increased without narrowing the outside diameter and the exit of the sirocco fan. Further, one edge of the blade 2 is opened longitudinally to allow blanking. Accordingly, the sirocco fan of one body can be formed only by assembling metal molds divided into halves.
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