Introduction to MD Horizontal Multistage Centrifugal Pump
The rotor part of the MD type multi-stage centrifugal pump for mining mainly consists of a shaft and components such as impellers, shaft sleeves, and balance disks installed on the shaft. The number of impellers depends on the number of stages of the pump. The components on the shaft are fastened together with the shaft by flat keys and shaft nuts. The entire rotor is supported by rolling bearings or sliding bearings at both ends. The bearings, depending on the model, do not bear axial forces, and their axial forces are balanced by a balance plate. The pump allows the rotor to move axially in the pump casing during operation, and radial ball bearings cannot be used. Rolling bearings are lubricated with grease, sliding bearings are lubricated with thin oil, and self-lubricating with oil rings, cooled by circulating water. The sealing surfaces between the inlet, middle, and outlet sections of the pump are sealed with molybdenum disulfide grease. A sealing ring and guide vane sleeve are installed between the rotor and fixed parts for sealing. When the wear of the sealing ring and guide vane sleeve affects the working performance of the pump, they should be replaced.
