Centrifugal Blower With Means to Distribute the Air More Evenly Inside the Cage for Reduced Noise in the Air at the Radially Outer Edges of the Blades
Original Publication Date: 1989-May-01
Included in the Prior Art Database: 2005-Jan-29
In a conventional centrifugal blower, air flows axially into the impeller from its open end and then flows radially outward through the revolving blades. The air flowing through the blower produces noise with a loudness that is proportional to about the 5th or 6th power of the air velocity. For this reason, the noise of a blower can be reduced by making the velocity more uniform -- reducing the highest velocities to reduce noise and raising the lowest velocity to provide the same air flow rate.