Blower scroll housing with structure to reduce noise and increase air flow

A scroll housing structure of a blower comprising:

• a scroll casing having a side wall with an air suction port at said side wall and including an air output port;
• a rotatable impeller provided in said scroll casing, said impeller having a plurality of blades on its circumferential surface, said casing further having a peripheral wall extending substantially circumferentially around said impeller, said peripheral wall having an interior surface facing said impeller, said impeller defining around itself a circumferential region circumscribing an angular range from 0.degree. to 360.degree.;
• and
• air guide means for guiding air, expelled from said impeller, so as to prevent a streamline of said air from curving and separating and flowing toward said side wall of said casing, said air guide means extending from and along an upper portion of said inner surface of said scroll casing from a position at which said streamline of the air expelled from said impeller begins to be initially curved and separated to a position adjacent said output port, said air guide means being so formed that it begins at an angle of about 270.degree. and continues to extend to at least an angle of 360.degree. of said angular range associated with said impeller and including a plurality of parallel spaced elements extending from and along the upper portion of said inner surface of said scroll casing.