The invention relates to a submersible
cutting sewage pump with efficient hydraulic performance and belongs to the technical field of submersible pumps. The submersible
cutting sewage pump comprising a submersible motor is characterized in that the submersible motor is connected with a pump body below through a connection segment to form a cooling and lubricating oil chamber; an efficient large-pass semi-open
impeller having a rear cover plate is disposed in the center of the lower portion of the pump body; an inlet edge of each
impeller blade is provided with a 30-45-degree large guiding tilt angle from the rear cover plate and a
front cover plate, and a center line of an
impeller blade outlet pass is flush with a center line of a radial outlet of the pump body; the lower end face of the pump body is connected with a pump base, a
cutting disc which is axially adjustable is connected to the upper portion of the pump base, the cross section of the upper end of the cutting disc is completely the same as a flow surface of the
front cover plate, projecting to the impeller blade axial surface, in shape, and a 0.2-0.3 mm required gap can be formed between the upper end of the cutting disc and the flow surface of the
front cover plate, projecting to the impeller blade, by adjusting axial movement of the cutting disc. The submersible cutting
sewage pump is high in hydraulic efficiency, has a wide efficient area, allows suctioning and passage of large particles, and has good effect of
impurity cutting and tearing.