| 摘要 |
PROBLEM TO BE SOLVED: To make the speed of wind flowing on each vane uniform over a whole length by installing a booster impeller driven by the same rotating shaft as the multi-vane impeller at a side where a wind speed of the inside of the cylindrical multi-vane impeller is slow. SOLUTION: A booster impeller 30 having the same rotating shaft 8 is installed at a side where a wind speed of the inside of the multi-vane impeller 3 is slow. The booster impeller 30 comprises a circular disc 31; a hub 32 fixed to an inner surface center of the circular disc 31; and a plurality of flat straight vanes 33 radially extending from the hub 32. These straight vanes 33 are fixed to an inner surface of the circular disc 31 and an outer periphery of the hub 32. The rotating shaft 8 is penetrated through a center hole 34 of the hub 32 and is fixed to the hub 32. According to such a constitution, at the time of operation, a gas flowing through a center hole of a retaining ring 6 is collided to a circular disc 31 of the booster impeller 30 in the inside of the multi-vane impeller 3 and is closed and next, the gas is urged toward a centrifugal direction by the straight vanes 33. Thus, the speed of wind flowing at the retaining ring 6 side of respective vanes 7, namely at the inflow side is accelerated.
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