Patent ID: 9599123
Date: 2017-03-21
CPC Classifications: F04D

Claim:
1. A blower fan comprising: an impeller centered on a central axis extending in a vertical direction; a motor portion arranged to rotate the impeller about the central axis; and a housing arranged to house the impeller; wherein the housing includes: the lower plate portion or an upper plate portion arranged to cover an upper side of the impeller includes an air inlet; the upper plate portion, the side wall portion, and the lower plate portion are arranged to together define an air channel portion arranged to surround the impeller; the upper plate portion, the side wall portion, and the lower plate portion are arranged to together define an air outlet on the lateral side of the impeller; the air outlet is planar and parallel to the central axis, and includes one of an edge of the upper plate portion, a pair of edges of the side wall portion, and an edge of the lower plate portion that is closest to the central axis; the side wall portion includes a tongue portion arranged to project between the air outlet and the impeller; a side surface of the tongue portion includes: the second tongue portion side surface is arranged to cross a second imaginary plane including the central axis and touching the side edge, wherein a closest proximity position, at which the first tongue portion side surface and the outer envelope are in closest proximity to each other, is located downstream of a third imaginary plane with respect to a rotation direction of the impeller, the third imaginary plane including the central axis and touching the second tongue portion side surface between the tongue portion tip and the side edge.