| 摘要 |
PROBLEM TO BE SOLVED: To prevent rolling-in of air from both end sides of a blowoff port, improve operational efficiency, and reduce a noise by partitioning a casing into the suction side and the blowoff side by a stabilizer arranged in the shaft direction of an impeller in the casing, and making a diameter of both end parts of the impeller larger than the other part. SOLUTION: In a device 1, an impeller is arranged in a casing, and an opening part of the casing is partitioned into the suction side and the blowoff side by a stabilizer arranged in the shaft direction of the impeller. A diameter θa of both end parts 1a and 1a of the impeller is made larger than a diameter θb of a part 1b sandwiched by both end parts. Therefore, since an air quantity of both end parts where rolling-in of air is induced increases more than the other part, a conterflow from both end parts can be prevented without arranging a projection or the like in both end parts 1a and 1a. A noise can be reduced, and operational efficiency can be improved. |
