| 摘要 |
PURPOSE:To prevent a large disorder of an air stream and to suppress an increase in noise of turbulent flow by incorporating a cylindrical ring having larger inner diameter than a minimum inner diameter of an orifice having a discharge port for surrounding an outer periphery of an impeller in a fan guard mounted near at a discharge side of a blower. CONSTITUTION:A fan guard 12 having a cylindrical ring 13 having larger inner diameter than a minimum inner diameter of an orifice 11 is mounted near a discharge port 11a. Thus, an air stream W1 obliquely discharged from an outer peripheral side 10c1 of a discharge side 10c of an impeller 10 is adhered to a bell-mouthlike inner wall of the port 11a of the orifice 11, obliquely discharged from the port 11a of the orifice 11 toward an inner wall of the ring 13 larger than the minimum inner diameter of the orifice 11, readhered to an inner wall of the ring 13, thereby scarcely peeling the stream. Easy peeling of the stream discharged in a discharging direction of a blower 5 from an inner wall of the port 11a of the orifice 11 is suppressed to prevent the stream W1 from being largely disordered. |
