Centrifugal fan, housing component cast, and method of manufacturing housing component

摘要

A centrifugal fan according to a preferred embodiment of the present invention includes an impeller, a motor portion, and a housing. The housing includes an upper plate portion, a lower plate portion, and a side wall portion. The upper plate portion or the lower plate portion includes an air inlet. One of the upper and lower plate portions and the side wall portion together define a single housing component molded by casting. A portion of the one of the upper and lower plate portions which is along a boundary between the side wall portion and the one of the upper and lower plate portions defines an increased thickness portion arranged to have an axial thickness greater than that of a remaining portion of the one of the upper and lower plate portions.

主权项

1. A centrifugal 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 contain the impeller and the motor portion; wherein the housing includes:
an upper plate portion arranged above the impeller;a lower plate portion arranged below the impeller, and arranged to have the motor portion fixed thereto; anda side wall portion arranged to cover sides of the impeller, and arranged to define an air outlet together with the upper and lower plate portions; the upper plate portion or the lower plate portion 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; one of the upper and lower plate portions and the side wall portion together define a single housing component molded by casting; a portion of the one of the upper and lower plate portions which is along a boundary between the side wall portion and the one of the upper and lower plate portions defines an increased thickness portion arranged to have an axial thickness greater than that of a remaining portion of the one of the upper and lower plate portions, the thickness of the increased thickness portion gradually increasing with increasing distance from the central axis; and an outer surface of the side wall portion includes a gate mark elongated in a circumferential direction, at least a portion of an axial range of the gate mark overlapping with an axial range of an inner surface of the increased thickness portion.