Fan assembly and vacuum cleaner having same

A fan assembly comprising:

• a housing;
• an impeller assembly, wherein at least part of the impeller assembly is accommodated in the housing, and wherein the impeller assembly comprises a plurality of impellers connected in series in an airflow flowing direction of the fan assembly;
• a driving member configured to drive the plurality of impellers to rotate;
• and
• a first flow guide member, wherein:
• the first flow guide member and an inner surface of the housing define a flow guide channel, wherein the flow guide channel is adapted to guide and discharge output air of an impeller on an upstream side to an impeller on a downstream side, and wherein the first flow guide member has a cross-sectional area decreasing in a direction from the impeller on the upstream side towards the impeller on the downstream side;
• the first flow guide member comprises a first flow guide member body, and a plurality of flow guide ribs arranged at intervals along an outer peripheral wall of the first flow guide member body, wherein an end, away from the first flow guide member body, of each of the plurality of flow guide ribs abuts against an inner wall surface of the housing to define the flow guide channel between two adjacent flow guide ribs, the first flow guide member body, and a cavity wall of an accommodation cavity of the housing;
• the first flow guide member has an outer limiting protrusion disposed thereon;
• the cavity wall of the accommodation cavity of the housing has a rotation-limiting groove matching the outer limiting protrusion, the outer limiting protrusion being located in the rotation-limiting groove;
• a flow guide inlet and a flow guide outlet are formed at two ends of the flow guide channel, respectively;
• and
• the flow guide channel comprises a first flow guide segment and a second flow guide segment that are connected successively in a direction from the flow guide inlet to the flow guide outlet, wherein in the direction from the flow guide inlet to the flow guide outlet, a sectional area of the first flow guide segment gradually decreases, a sectional area of the second flow guide segment gradually increases, and a sectional area of the flow guide outlet is greater than a sectional area of the flow guide inlet.