Centrifugal fan and method for manufacturing the same

摘要

A blower fan includes an impeller centered on a central axis, a motor portion arranged to rotate the impeller about the central axis, and a housing arranged to accommodate the impeller. The housing includes a lower plate portion arranged to cover a lower side of the impeller and a side wall portion arranged to cover a side of the impeller. The lower plate portion is preferably made of, for example, a steel sheet. The side wall portion is preferably made of, for example, a resin. A lower end portion of the side wall portion and an edge portion of the lower plate portion are preferably joined to each other through insert molding. An outer circumferential cut surface of the lower plate portion is arranged in contact with the side wall portion at a joint between the lower end portion of the side wall portion and the edge portion of the lower plate portion.

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 accommodate the impeller; wherein the housing includes:
an upper plate portion arranged to cover an upper side of the impeller;a lower plate portion arranged to cover a lower side of the impeller, and arranged such that the motor portion is fixed thereto; anda side wall portion arranged to cover a side of the impeller, and to define an air outlet in combination with the upper plate portion and the lower plate portion; at least one of the upper plate portion and the lower plate portion includes an air inlet defined therein; the lower plate portion is defined by a sheet having a lower surface coated with a paint, the lower plate portion including an outer circumferential cut surface; the side wall portion is made of a resin; a lower end portion of the side wall portion and an edge portion of the lower plate portion are directly and integrally joined to each other, with the outer circumferential cut surface of the lower plate portion arranged in contact with the side wall portion at a joint between the lower end portion of the side wall portion and the edge portion of the lower plate portion; and the outer circumferential cut surface of the lower plate portion is fixedly embedded within the side wall portion through insert molding.