| 摘要 |
PROBLEM TO BE SOLVED: To provide a centrifugal blower capable of reducing noise caused by circulating flow while restricting increased weight and increased cost.SOLUTION: A blade 21 of a centrifugal blower 51 in the case that an angle formed by a tangential line L1 of a camber line CL at a crossing point P between the camber line CL at a blade section passing through a front edge 61 and a rear edge 62 of the blade 21 and an arc with a revolving shaft A being a center and a tangential line L2 of an arc at the crossing point P is defined as a blade angle &bgr; has at least one of a reducing shape in which the blade angle &bgr; is decreased as the crossing point P on the camber line CL is shifted toward the rear edge 62 at a part PL of the front edge 61 in a blade section S1 of a shroud 19 and a constant shape in which the blade angle &bgr; is kept constant even if the crossing point P on the camber line CL is shifted toward the rear edge 62 at the part PL of the front edge 61 at the blade section S1 of the shroud 19. |
