| 摘要 |
<p>A suction blower for a vacuum cleaner comprises an impeller 70 rotating within a shallow chamber 67 defined by two molded plastics members 29, 99. A plurality of diffuser vanes 110 molded integrally with the plastics member 29 are disposed in a circular array surrounding the edge of the impeller 70, there beings 6:1 ratio in the number of vanes 110 to impeller blades. The vanes 110 are disposed to direct airflow generally downstream with respect to the direction of rotation for the impeller and are constructed to reduce shock and diffusion losses and thereby achieve a smoother and more streamlined air flow. The impeller is driven by a motor 21,22 which is cooled by an auxiliary fan 55. <IMAGE></p> |
