Patent ID: 9599122
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; and 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 between the first imaginary plane and a third imaginary plane including the central axis and touching the second tongue portion side surface between the tongue portion tip and the side edge, wherein the tongue portion tip is located between the outer envelope and a fourth imaginary plane parallel to the air outlet and touching the outer envelope.