Patent ID: 6602051
Filing Date: 2003-08-05
Classification: F04D,Y10S

Abstract:
A blowing apparatus comprising:a circular wall at a distance from a blade end of a fan; and a housing comprising the circular wall integrally formed with a boss portion for fixing a motor, wherein the circular wall comprises a first region where an inner diameter varies from a smaller to a larger diameter so that a clearance with the blade end on a suction side is substantially wide, and a second region where a clearance with the blade end is substantially narrow, wherein the second region has a terminal end extending halfway on a discharge side, an air pocket portion having an opening toward the discharge side is between an outer circumference of the circular wall and an outer peripheral portion of the housing, the circular wall further comprises a slit for allowing air communication between the inner circumference of the circular wall and the air pocket portion, and the housing is formed by a mold comprising only upper and lower cores.