Axial fan apparatus, housing, and electronic apparatus

Abstract

An axial fan apparatus including an axial-flow impeller, a drive unit, and a housing. The axial-flow impeller is capable of rotating and includes a plurality of blades inclined with respect to a rotational axis direction. The drive unit rotates the axial-flow impeller. The housing is mounted with the drive unit, and includes a sidewall, and a plurality of slits that circulate gas. The sidewall is provided around the axial-flow impeller. The plurality of slits are provided to the sidewall and inclined with respect to the rotational axis direction in a direction opposed to a direction in which the plurality of blades incline.

1 . An axial fan apparatus, comprising;
 an axial-flow impeller capable of rotating, that includes a plurality of blades inclined with respect to a rotational axis direction;   a drive unit that rotates the axial-flow impeller;   a housing mounted with the drive unit, the housing including (a) a sidewall provided around the axial-flow impeller, and (b) a plurality of slits that circulate gas in the sidewall and inclined with the respect to the rotational axis direction in a direction opposed to a direction in which the plurality of blades incline,   wherein,
 an inclination angle of the slits with respect to the rotational axis direction is larger than 0° and smaller than 90°, and 
 the sidewall includes at least an annular inner circumferential surface. 
   
     
     
         2 . An axial fan apparatus, comprising:
 an axial-flow impeller capable of rotating to effect a flow of gas to cool down one or more heat generators, the axial-flow impeller including a plurality of blades inclined with respect to a rotational axis direction;   a drive unit that rotates the axial-flow impeller; and   a housing mounted with the drive unit, the housing including an annular sidewall around the axial-flow impeller, the annular sidewall including a plurality of slits that enable the circulation of the gas, the plurality of slits being adjacently spaced, defined entirely within the annular sidewall, and inclined with respect to the rotational axis direction in a direction opposed to a direction in which the plurality of blades incline, the axial-flow impeller and the plurality of slits being configured to affect the flow of the gas to suppress noise produced by the axial-flow impeller, a mount plate extends from a lower portion of the annular sidewall for mounting the axial fan apparatus,   wherein,
 an inclination angle of the slits with respect to the rotational axis direction is larger than 0° and smaller than 90°, and 
 the sidewall includes at least an annular inner circumferential surface.