Patent ID: 9360019
Filing Date: 2016-06-07
CPC Classification: F04D,G06F

Claim Text:
1. A blower fan comprising: an impeller including a plurality of blades arranged to rotate about a central axis extending in a vertical direction and arranged in a circumferential direction, and an annular blade support portion arranged to support the blades; a motor portion arranged to rotate the impeller; and a housing arranged to contain the impeller; wherein the housing includes: 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; a space joining a space above the impeller and a space between the impeller and the lower plate portion to each other in an axial direction is defined between adjacent ones of the blades of the impeller; the blower fan further comprises a heat source contact portion with which a heat source is to be in contact, the heat source contact portion being arranged in a surface of the blower fan which faces away from the impeller; the air outlet is a plane parallel to the central axis, and including one of an edge of the upper plate portion, a pair of edges which are circumferential ends of the opening of the side wall portion, and an edge of the lower plate portion that is the closest to the central axis; the side wall portion includes a tongue portion arranged to project between the air outlet and the impeller; when an imaginary straight line which is parallel to the air outlet and which intersects with the central axis in a plan view is defined as a first imaginary straight line, and an imaginary straight line which is perpendicular to the air outlet and which intersects with the central axis in the plan view is defined as a second imaginary straight line; of four regions divided by the first and second imaginary straight lines, a region in which the tongue portion is arranged is defined as a first region, and the three other regions are defined as a second region, a third region, and a fourth region in an order in which the three regions are arranged in a rotation direction of the impeller from the first region; an imaginary straight line which is tangent to an outer circumferential surface of the blade support portion and which extends in parallel with the second imaginary straight line toward the air outlet in the first region is defined as a third imaginary straight line; and an imaginary straight line which is tangent to the outer circumferential surface of the blade support portion and which extends in parallel with the first imaginary straight line in the third region is defined as a fourth imaginary straight line; at least a portion of the air outlet is arranged in the fourth region; and the heat source contact portion is arranged to cover a portion of a region surrounded by the third imaginary straight line, the fourth imaginary straight line, the outer circumferential surface of the blade support portion, and the air outlet.