Double-shell symmetric radially-split multi-stage centrifugal pump with first-stage double-suction structure

Abstract

The invention provides a double-shell symmetric radially-split multi-stage centrifugal pump with a first-stage double-suction structure. The centrifugal pump comprises an outer cylinder body, whereinthe left end and the right end of the outer cylinder body are provided with a suction side stuffing box body and a pump cover through sealing structures respectively, and a central shaft is coaxiallyassembled in the middle of the outer cylinder body; the central shaft is provided with a cartridge component located in an installation cavity of the outer cylinder body, wherein three annular cavities are formed by the cartridge component and the inner wall of the outer cylinder body through closed shoulders, and the three annular cavities comprise a suction cavity, a discharge cavity and a transition cavity from left to right in sequence; and the cartridge component comprises a first section, a middle section and a tail section which are sequentially connected from left to right, and a firstimpeller, middle impellers and tail impellers which are annularly fixed on the central shaft are assembled in the inner cavity of the first section, the inner cavities of the middle section and the inner cavities of the tail section respectively. According to the centrifugal pump, cavitation resistance is improved, the secondary impellers are arranged back to back, so that axial force of a multi-stage pump rotating part is self-balanced, and higher safety is realized.

Description

Technical field [0001] The invention belongs to the technical field of centrifugal pumps, in particular to a symmetrical radially split multistage centrifugal pump with double-suction first-stage double-casing structure. Background technique [0002] Centrifugal pump refers to the pump that transports liquid by the centrifugal force generated when the impeller rotates. When the centrifugal pump performs centrifugal infusion, the centrifugal pump will produce cavitation phenomenon during operation. Cavitation refers to the flow of fluid due to the reduction of local pressure. bubble phenomenon. Cavitation occurs in the pump, which will cause erosion of parts in the cavitation part, and further development will cause the head to drop and generate vibration and noise. In order to solve the adverse consequences caused by cavitation, the user needs to design a required value of NPSH (also called net suction head) for each centrifugal pump used in the overall design of the field ...

AI Technical Summary

Problems solved by technology

The torque of the traditional secondary impeller is transmitted to the installation shaft when it is working. The traditional centrifugal pump is designed with a balance drum structure to balance the axial force. This not only increases the complexity of the centrifugal pump, but also makes the balance drum work Will cause wear and tear, bringing greater safety hazards

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