The invention discloses a blockage-prevention winding-prevention centrifugal type self-suction
sewage pump. The pump is composed of a pump body, an
impeller, a pump shaft and a suspension; a suction opening, a suction channel, an exhaust opening, a gas and water separation chamber and a water returning hole are formed in the pump body; a suction one-way valve is arranged on the suction opening, particularly, in the suction channel of the pump body, an
impurity cutter coaxial with the
impeller is arranged in front of an
impeller water inlet, and is composed of a fixed cutter rest and a cutter wheel, a fixed cutter on the fixed cutter rest and a movable cutter on the cutter wheel form a
cutting pair, the pump shaft drives the impeller to rotate and meanwhile drives the cutter wheel to rotate, and
fiber impurities in conveyed media are
cut and broken before entering the impeller; the blockage-prevention winding-prevention centrifugal type self-suction
sewage pump has the beneficial effects that a
cutting device on an impeller inlet is used for
cutting and breaking the
fiber impurities in the conveyed media, winding and blockage of blades in the impeller due to the
fiber impurities are removed, the
sewage pump can reliably and normally run, and the problem happening when the centrifugal type self-suction sewage pump is used as a self-suction sewage pump is solved.