| 摘要 |
PURPOSE: A centrifugal multi-blade fan is provided to prevent the performance of the centrifugal multi-blade fan from being deteriorated by simplifying a size of the centrifugal multi-blade fan with reducing loss of flow rate. CONSTITUTION: A centrifugal multi-blade fan(20) includes a plurality of blades(22), which are circularly arranged in a predetermined interval. An end plate(24) is installed at first ends of the blades(22), and a support ring(26) is installed at second ends of the blades(22). A hub(28) is protruded from a middle part of the end plate(24) towards an air inlet. A height of the hub(28) is smaller than a fan diameter, less than 30% of the fan diameter. A boss(30), into which a motor shaft is fixedly inserted, is protruded from an upper center portion of the hub(28). A plurality of supporting ribs(32) is aligned at an outer surface of the boss(30). A driving motor is accommodated in a cavity formed in a lower portion of the hub(28).
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