Downcomer of making an uproar falls

The utility model discloses a downcomer of making an uproar falls, its technical scheme main points are the inner tubes including outer tube and coaxial fixed connection, the outer tube with vacuole formation between the inner tube, the inner wall of inner tube is equipped with shirt rim no. 1 and shirt rim no. 2, a shirt rim draw shirt rim no. 2 is two spiral distribution. The utility model provides a water impact pipe wall in the current downcomer produce the problem of noise. 本实用新型公开了种降噪下水管，其技术方案要点是包括外管和同轴固定连接的内管，所述外管与所述内管之间形成空腔；所述内管的内壁设有裙边和裙边二，所述裙边和所述裙边二呈双螺旋分布。本实用新型解决了现有下水管内的水流冲击管壁产生噪音的问题。