Novel multi-stage pump balance mechanism

The utility model discloses a novel multistage pump balancing mechanism which comprises a pump cover and a rotating shaft, a balancing sleeve is arranged on the pump cover, a second flange is arranged at one end, facing a low-pressure cavity, of the balancing sleeve, and a first sinking table and a second sinking table are coaxially arranged at the outer end of the second flange. A first flange is arranged at the end, facing the low-pressure cavity, of the balance drum disc, the inner end face of the first flange is in contact fit with the bottom face of the first sinking table, a pressure coupling groove is further formed in the inner end face of the first flange, and the pressure coupling groove and the balance drum disc are coaxial. The pressure coupling groove comprises a flat bottom, the inner side of the flat bottom is smoothly connected with the outer wall of the balance drum disc through a first arc surface, and the outer side of the flat bottom is provided with a second arc surface; the second sinkin