Anti-wear protection device for inlet expansion joint of slurry circulating pump

The utility model discloses a slurry circulating pump inlet expansion joint anti-abrasion protection device which comprises a cylindrical protective sleeve arranged in an expansion joint, a gap is formed between the protective sleeve and the inner wall of the expansion joint, a first flange and a second flange are arranged at the two ends of the expansion joint respectively, one end of the protective sleeve is fixedly connected with the first flange, and the other end of the protective sleeve is fixedly connected with the second flange. And the other end of the sheath is close to the second flange. Slurry sequentially flows through the suction pipe and the sheath in the expansion joint from the pipeline and then enters the pump shell. And as the slurry does not scour the inner wall of the expansion joint any more, the abrasion of the expansion joint is reduced, and the service life of the expansion joint is prolonged. Due to the fact that the gap is formed between the protective sleeve and the inner wall of t