Multistage pump suction section with self-washing structure

Provided is a multistage pump suction section with a self-washing structure. An annular water absorption chamber is formed in the suction section, a separation tongue is arranged in the water absorption chamber, a self-washing hole is formed in the separation tongue, an emptying port is formed in the upper portion of the outer side of the water absorption chamber, a liquid drainage port is formed in the lower portion of the water absorption chamber, and the self-washing hole is communicated with a sealing cavity and a first stage impeller outlet of a multistage pump; connecting screw holes for mechanically sealing a packing gland are arranged in the periphery of the sealing cavity, the number of the connecting screw holes is four, and the connecting screw holes are uniformly distributed; an O-shaped ring groove is formed in a matching surface on the middle section of the multistage pump; supporting bottom feet are further provided with reinforcing ribs, draw-in bolt holes and bearing body connecting holes are further formed in the suction section, and the reinforcing ribs are connected with outer sides of the supporting bottom feet and outer sides of the draw-in bolt holes; positions, close to the outer side of the water absorption chamber, of one reinforcing rib are respectively provided with a process hole; a suction inlet flange is arranged on one side of the suction section, an instrument port is formed in an outer circle of the flange, a balance pipe port is formed in the neck portion of the flange, and the position of the flange can be exchanged horizontally by 180 degrees.