Mechanical seal circulating flushing mechanism of submersible sewage pump

The invention belongs to the field of submersible sewage pumps, and particularly relates to a mechanical seal circulating flushing mechanism of a submersible sewage pump. Comprising a motor and a pump, the motor comprises a motor stator, a motor rotor and a motor lower end cover, the pump comprises a pump base, a pump body, an impeller and a pump cover, the motor rotor and the pump share the same shaft, the shaft sequentially penetrates through the pump cover and the impeller, and the pump cover is fixedly connected with the motor lower end cover; the pump body is sleeved outside the impeller and is fixedly connected with the pump cover, and the pump seat is fixedly connected with the pump body; a mechanical sealing piece is arranged between the pump cover and the shaft to prevent water from entering the motor; a rib plate is arranged on the pump cover, a flushing hole is formed in the rib plate, and the flushing hole is communicated with the cavity of the pump body and the position where the mechanical seali