Impeller cover of dust collector fan and dust collector fan

The impeller cover of the dust collector fan comprises an impeller cover shell, a movable impeller is arranged on the inner circumference of the impeller cover shell in a relatively rotatable and sleeving mode, a plurality of flow guide ribs are arranged on the inner wall of the impeller cover shell, and the flow guide ribs integrally extend towards the inner side of the impeller cover shell alongthe inner wall of the impeller cover shell. The flow guide ribs are annularly distributed on the inner wall of the impeller cover shell at intervals to form a flow guide channel for guiding air outlet air flow of the movable impeller; through the structural innovative design of the impeller cover, airflow is prevented from directly impacting the inner wall of the impeller cover after flowing outfrom the inlet to the outlet when the movable impeller rotates, and then the technical defect caused by the fact that the airflow directly impacts the inner wall of the impeller cover is avoided. 本实用新型公开了一种吸尘器风机的叶轮罩及其吸尘器风机，包括叶