The utility model discloses a piezometric tube with a
backwashing structure, which comprises a tube body, a washing
assembly and a positioning
assembly, the tube body comprises a
guide tube section and a permeable section which are of an up-down structure, the washing
assembly is arranged in the tube body and is provided with a water outlet tube, the positioning assembly comprises a sleeve, a positioning plate and an elastic piece, and the sleeve is connected to the water outlet tube. The sleeve is provided with a sliding way facing the inner wall of the
pipe body, the positioning plate is slidably arranged on the sliding way, the elastic piece is arranged between the sleeve and the positioning plate, and the positioning plate keeps making contact with the inner wall of the
pipe body under the elastic force of the elastic piece. By means of continuous elastic pressing of the elastic piece on the positioning plate, a constraint structure is formed between the water outlet
pipe and the inner wall of the pipe body, the structure can effectively restrain transverse shaking caused by fluid
impact in
backwashing operation, vibration energy is absorbed through deformation of the elastic piece, and therefore the
vibration amplitude and frequency of the washing assembly are reduced, and the washing efficiency is improved. The dynamic load
impact of the joint part is obviously reduced, and the stability and durability of the whole structure are enhanced.