Internal ring type protecting dip pipe

The utility model relates to a protecting pipe preventing plugging of aluminum for continuously cast steel, particularly an internal ring type protecting dip pipe which is provided with one layer of single-layer structure of an internal convex ring on the middle part of the internal wall of a pipe chamber of the protecting pipe, or the middle part of the internal wall and the curved moon point which is immersed into molten steel are respectively provided with a double-layer structure of a convex internal ring and a multi-layer structure of other positions. The thickness of the convex ring is 4 to 15 millimeters, and the length is 60 to 350 millimeters; the internal ring is combined to have a single-layer or multi-layer convex internal ring structure through an integral shaping method or various shaping methods. The internal ring type protecting dip pipe of the structure changes the internal wall structure of the traditional pipe, and accordingly, the turbulent flow state in the original molten steel pipe chamber can be changed; eddy current which is fixed to the top position can move; the internal side of a steel-tapping hole is subjected to intense agitation of the eddy current, and sedimentation of aluminum oxide on the internal chamber of the pipe and the periphery of the steel-tapping hole can be reduced. Accordingly, the plugging can be prevented.