| 主权项 |
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:
a lower plate portion arranged to cover a lower side of the impeller, and arranged to have the motor portion fixed thereto; anda side wall portion arranged to cover a lateral side of the impeller; 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:
a tongue portion tip arranged to touch a first imaginary plane including the central axis;a first tongue portion side surface arranged to extend from the tongue portion tip along an outer envelope of the impeller; anda second tongue portion side surface arranged to extend from the tongue portion tip toward a side edge, the side edge being a line of intersection of the air outlet and the side wall portion; and the second tongue portion side surface is arranged to cross a second imaginary plane including the central axis and touching the side edge. |
