Patent ID: 7437798

Claim:
An air reflux assembly for a cleaner, comprising: an outer shell with an inner chamber, an inner shell, a rotating disc, a rotating disc seat, and return air ducts the inner shell is positioned at a lower part of the inner chamber of the outer shell, the rotating disc seat is connected to an upper portion of the inner shell, the rotating disc is placed against the rotating disc seat; said rotating disc seat comprises an upper flange, a body with an inner chamber, a partition and a lower flange; a first three groups of upper windows, middle windows, lower windows are arranged in the rotating disc seat and the upper windows are arranged in the upper flange, the middle windows are arranged in the body and the lower windows are arranged in the partition; upper air inlets and lower air outlets are arranged on the rotating disc seat, the upper air inlets are arranged in the upper flange, the lower air outlets are arranged under the middle windows; the two ends of the return air duct are respectively connected to the upper air inlets and the lower air outlets; a second three groups of upper windows, middle windows, lower windows which correspond to the first three groups of upper windows, middle windows, lower windows of the rotating disc seat are arranged in the rotating disc; the bottom surface of the rotating disc is in conformity with the top surface of the rotating disc seat; when the upper windows of the rotating disc are rotated to the positions where said upper windows are aligned with the upper windows of the rotating disc seat, the upper air inlets of the rotating disc seat are covered by other portions of the rotating disc other than the upper windows, the middle windows of the rotating disc are covered by other portions of the rotating disc seat other than the middle windows, the middle windows of the rotating disc seat are covered by other portions of the rotating disc other than the middle window, the lower windows of the rotating disc are aligned with the lower windows of the rotating disc seat; when the upper windows of the rotating disc are rotated to the positions where said upper windows are aligned with the upper air inlets of the rotating disc seat, the upper windows of the rotating disc seat are covered by other portions of the rotating disc other than the upper windows, the middle windows of the rotating disc are aligned with the middle windows of the rotating disc seat, the lower windows of the rotating disc are covered by other portions of the rotating disc seat other than the lower windows, the lower windows of the rotating disc seat are covered by other portions of the rotating disc other than the lower windows.