Single stage centrifugal pump is the only one of the pump impeller, the maximum lift is only 125 meters; multistage centrifugal pump refers to two or more than two of the pump impeller, the maximum can lift more than 125 meters; in multistage pump single stage pump head must be equipped with two step motor case can be increased by the number of impeller with four step motor, which can improve the pump life and reduce the noise of machine, but the multi-stage pump maintenance relative single-stage pump to a difficult point.
Is that the characteristics of single stage centrifugal pump, it includes a motor output shaft and the pump shaft arranged between the clamp type couplings, and mounted on the bearing seat to guide bearing auxiliary supporting shaft; the clamp coupling respectively with the output shaft of the motor shaft and the rigid connection between the motor and the output shaft the pump shaft is left for mechanical seals and sealing cover installation space. Single stage centrifugal pump is composed of pump body, pump cover, a motor with an output shaft installed in the pump body, pump shaft, bearing, impeller, mechanical seals and sealing cover, in the repair or replacement of mechanical seals, without dismantling the motor and pump cover.
The significance of multi-stage centrifugal pump is to improve the set pressure. More than two of the centrifugal pump will have the same function together, the fluid channel structure, performance in the first level of the medium pressure export import relief and second grade is grade second medium and third level of export import relief pressure is so formed a series mechanism of multistage centrifugal pump. Multistage centrifugal pump is a fluid (gas and liquid, can also be a mixture of suspended particles and gas or liquid) from the vane root (import) into the medium, rely on high speed rotating blades for centrifugal force, resulting in a high pressure, pressure relief from export (export) medium flow conveying equipment.
In the actual needs of the magnetic pump head is less than 125 meters, the area under the pumping station, pump (pump prices generally higher than the single-stage pump high price), and other factors to consider in the selection of single stage or multi-stage pump pump.
