Labyrinth type sealing multi-stage pump

The utility model relates to a labyrinth type sealing multistage pump which comprises a pump shell, a pump shaft and an impeller, a flange portion of the impeller is fixed with the pump shaft, a sealing ring is arranged between the periphery of the flange portion and an inner ring of the inner edge of the pump shell, the sealing ring is provided with an outer flange located on the outer side and an inner flange located on the inner side, and a first annular groove is formed between the outer flange and the inner flange. A second annular groove is formed in the flange portion of the impeller, a first flow channel for water flow to pass through is formed between the inner end face of the outer flange edge of the flange portion and the inner bottom face of the first annular groove, and a second flow channel for water flow to pass through is formed between the end face of the inner flange and the inner bottom face of the second annular groove. According to the utility model, a similar S-shaped labyrinth sealing s