Patent ID: 6339935
Filing Date: 2002-01-22
Classification: F04D,F24F

Abstract:
Apparatus for radially distributing the flow leaving a centrifugal blower wheel that includes:a housing having a vertical front wall and a spaced apart vertical rear wall, said housing further including a blind opening passing inwardly through the front wall, so that the walls of the opening are perpendicular to the rear wall of the housing; said opening containing an upper section that extends horizontally across said housing and a volute shaped lower section that opens into the upper section through a bottom wall of said upper section; a blower wheel having radial or rearwardly curved blades mounted for rotation in said lower section of the opening about a horizontal axis; said lower section of the housing opening containing a spiral shaped wall having a proximal end and a distal end, said proximal end of said spiral wall intersecting the bottom wall of said upper section adjacent to said blower wheel to form a restricted cutoff region between the blower wheel and the lower section of the opening, said spiral being centered about on the axis of said blower wheel and increasing from cutoff region through about 200Â° of arc to the distal end of said spiral wall, and an inclined wall that is tangent to the spiral wall at the distal end thereof, said inclined wall passing upwardly to intersect the bottom wall of said upper section of said opening to form an expanded exit region between the upper and lower sections of the opening.