Air impeller for aerator

The utility model relates to an air impeller for an aerator. The utility model comprises a hollow shaft sleeve, and the hollow shaft sleeve radiately and outwards extends with a plurality of curled impeller vanes. The utility model is characterized in that the impeller vanes are fixedly connected to an upper cover tray and a lower chassis. The upper cover tray near the periphery of the hollow shaft sleeve is provided with a through ring which can form an air inlet. The inner circumference of the hollow shaft sleeve radiately extends with a plurality of protruding ridges of a clamping-combining power shaft. Through air passages are formed among the protruding ridges. The utility model is compared with the prior art, the utility model has the obvious advantages that the utility model with convenient structure is convenient to install and easy to maintain, two air passages adapt to two air negative pressure chambers, thus, work efficiency of the advanced technology of the aerator which is composed of two mixing chambers is a plurality of times as much as that of the prior art, and the aerator for which the utility model is suitable can be widely used for the biological oxygen enhancement and the COD and BOD primary treatment of various sewage plants, the environment treatment of rivers and lakes and the oxygen enhancement application of breeding industries.