Patent ID: 9456728
Filing Date: 2016-10-04
CPC Classification: A47L,F04D

Claim Text:
1. A vacuum cleaner comprising: an electric motor, an impeller and an axial diffuser being arranged on a common axis, the impeller being connected to the electric motor and arranged for rotation on the common axis to achieve a radial air flow, the axial diffuser being configured to redirect the radial air flow into an axial air flow; the diffuser comprising an inner circumferential wall that is spaced from the motor and an outer circumferential wall that is spaced from the inner circumferential wall, the inner circumferential wall and the outer circumferential wall being coaxially arranged around the common axis and extending from a diffuser inlet adjacent the impeller to a diffuser outlet that is spaced from and surrounds the electric motor, and wherein the inner circumferential wall and the outer circumferential wall terminate at the diffuser outlet at substantially the same point along the common axis; the diffuser further comprising a plurality of diffuser passages extending from the diffuser inlet to the diffuser outlet, each diffuser passage being delimited in a circumferential direction between the inner circumferential wall and the outer circumferential wall by vanes extending between the inner circumferential wall and the outer circumferential wall; and wherein at least one diffuser passage comprises: