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What is the structure of a multi-stage centrifugal pump? Multi-stage centrifugal pumps are of the segmented type; in the direction perpendicular to the pump shaft, the pump casing is divided into a suction casing (the inlet section), a discharge casing (the outlet section), and stage casings (the intermediate sections). These casings are connected to each other by four sturdy long bolts, while the joints between the various stages of casings are fully sealed with O-rings. All parts of the pump shaft surface that come into contact with water are covered by shaft sleeves and impeller balance discs. To ensure that water flows continuously and smoothly out through the impeller, the impellers are all connected to the pump shaft via shaft keys in the same direction. During operation, all the axial forces generated by the impeller are completely canceled out by each other through the balance discs, which rotate with a gap of approximately 0.1 mm from the gaskets. The pump is directly driven by the motor through a coupling. The fixed parts of a multi-stage centrifugal pump consist of the inlet section, intermediate section, outlet section, guide vanes, bearing housing, and sealing device. The rotating parts mainly consist of the pump shaft, as well as the impeller and guide vanes mounted on the shaft, shaft sleeves, mechanical seals, and a balance disc, balance plate, and elastic coupling to balance the axial thrust. Shanghai Shengou Pump Valve Co., Ltd. 021-54148004