| 摘要 |
PROBLEM TO BE SOLVED: To provide a centrifugal fan which is excellent in static pressure characteristic and air amount characteristic and has little noise.SOLUTION: A centrifugal fan includes an impeller 10 rotating around a rotation shaft, an impeller case 20 for housing the impeller 10, a motor 30 for rotationally driving the impeller 10 and a motor case 21 for housing the motor 30. The impeller 10 includes a boss part 11 jointed to a shaft 31 rotating coaxially with the rotation shaft, a hub part 12 extended from the boss part 11 radially outward and a plurality of blades 13, the plurality of blades 13 are extended radially outward, an inner wall of the impeller case 20 has an inside surface spread radially outward along upper edge parts of the plurality of blades 13 and a lateral edge part 20a of a suction port 40 located on a center part of the impeller case 20 has a curved surface that protrudes radially inward. |
