Airlock hollow impeller shaft

The utility model discloses an airlock hollow impeller shaft. The impeller shaft is fixedly embedded and cast in a central hole of an impeller, the impeller shaft is hollow, a locating step used for locating the impeller in the axial direction after casting is carried out is arranged on the impeller shaft, and at least two locating through holes perpendicular to the axial line of the impeller shaft are formed in the position, in the central hole of the impeller, of the impeller shaft. In the rotating process of a rotor of the impeller, an internal step corresponding to the locating step is formed by the cast impeller central hole, and axial locating and radial locating of a part of the impeller formed through the locating through holes with the impeller shaft are achieved. According to the airlock hollow impeller shaft, the impeller shaft is hollow, the impeller shaft and the impeller are combined firmly through the casting technology, the problem of heat dissipation when the rotor of the impeller rotates is