Dry quenching circulating fan

The utility model discloses a dry quenching circulating fan which comprises a gas inlet box, a casing, a nitrogen carbon ring seal, a spindle, an impeller, an air inlet, a slide bearing and a motor. The dry quenching circulating fan is characterized in that the impeller comprises a front disc, a central disc, blades, blade protecting sheets and central disc protecting sheets, the blades are connected with the front disc and the central disc through welding, the working faces of the blades are fully attached with the blade protecting sheets, the surface of the central disc is fully attached with the central disc protecting sheets, and the surface of a volute plate in the casing is fully attached with volute protecting sheets; a stainless steel shaft sleeve is added in the matching position of the nitrogen carbon ring seal and the spindle, and a radiating wheel is arranged; and the impeller and the air inlet adopt a butt joint structure for matching. The dry quenching circulating fan has the benefits of compact