Patent ID: 6619914
Filing Date: 2003-09-16
Classification: F04D

Abstract:
An air cleaner for cleaning ventilation air, comprising:a main body case; a centrifugal fan runner provided within said main body case; a motor provided within said main body case for rotating said centrifugal fan runner; a filter for cleaning air flow blown out from said centrifugal fan runner; and a stationary pressure collecting vane, being provided at an outlet side of said centrifugal fan runner, for collecting stationary pressure therein, wherein said centrifugal fan runner comprises: a core plate being connected to an axis of said motor; a side plate being provided opposing to said core plate; and backward blades being provided at a distance in a circumferential direction of said core plate, while being inclined in an anti-rotational direction thereof, wherein said backward blades are bent on a position at a distance of about Â½-1/(3.5) of length of each of said blades from an outer periphery thereof, so that an outlet portion thereof is inclined into a direction of rotation of said blade, and an outlet angle of the outlet portion with respect to a tangential direction on an outer periphery of said side plate lies from about 40 degrees to about 60 degrees.