QUIET AND EFFICIENT MOTOR COOLING FAN ASSEMBLY FOR A BLENDER

摘要

A blender (10) includes a pitcher assembly (11),a motor and housing assembly (12) and a cooling fan andnoise muffling assembly (13). The pitcher assembly (11)includes a blender pitcher (14) having a mixing blade (15)therein driven by a motor (24) positioned in the housingassembly (12) which includes a base frame (31) and a cover(21). The motor (24) is positioned in a pedestal (37)formed in the base frame (31). The base frame (31) isprovided with air intake apertures (53, 55). The fan andnoise muffling assembly (13) includes a radial fan (60)driven by the motor (24) and a muffler housing (62) whichincludes a generally cylindrical side wall (68). Air isdrawn in through the apertures (53, 55) by the fan (60) andis caused to pass by the motor (24) within the pedestal(37) to cool the motor (24). It then passes through anaperture (66) in an orifice plate (61) and as directed bythe fan (60) against the side wall (68). At that point theair turns ninety degrees downwardly and is directed intofour chambers (73) below the fan (60), the chambers (73)being formed by ribs (74) extending radially outward from ahub member (75) positioned below the fan (60). The airthen again turns ninety degrees inwardly into two chambers(76) divided by a rib (77) below the hub member (75)whereby it turns again and leaves the blender (10) throughan air exit aperture (70).