Patent ID: 6299409
Filing Date: 2001-10-09
Classification: F04D

Abstract:
A centrifugal type blower unit comprising:a centrifugal fan having a rotation axis and a plurality of blades disposed around said rotation axis, said centrifugal fan blowing air sucked from an axial direction of said rotation axis toward a radial outward side; anda scroll casing for accommodating said centrifugal fan, said scroll casing forming an air passage through which air blown from said centrifugal fan flows, and having a suction port for sucking air from the axial direction at a side of the axial direction, wherein:said suction port has a radius dimension in a radius direction of said centrifugal fan, said radius dimension of said suction port being larger than a minimum inner radius dimension of said centrifugal fan in said radius direction;each of said blades has a slanting portion slanted relative to said radius direction by a predetermined slanting angle, and a constant portion approximately parallel to said axial direction; andsaid slanting portion is formed into a straight line shape in each blade of said centrifugal fan in such a manner that an inner radius dimension of said centrifugal fan in the radius direction is increased toward said suction port; andsaid slanting portion and said constant portion define each inner radius end of said blades in said radius direction, at least a portion of said slanting portion is positioned at an inner radial side of said suction port, and is slanted radially outside from said constant portion toward an axial end of each blade where said suction port is provided.