Multistage pump structure description

The multistage pump is mainly composed of four parts: stator, rotor, bearing and shaft seal:
1. The stator part of the multi-stage pump is mainly composed of a suction section, a middle section, a discharge section and a guide vane. The tension bolts clamp the sections to form a working chamber. The D-type multi-stage pump generally draws horizontally and discharges vertically upwards; when it is used for oilfield water injection, the pump inlet and outlet are vertically upward. The DG type multi-stage pumping and inlet are vertically upward.

2. The rotor part of the multi-stage pump is mainly composed of a shaft, an impeller, a balance disc and a bushing. The axial force is balanced by the balance disc.

3. The multi-stage pump bearing is mainly composed of bearing body, bearing and bearing gland, and the bearing is lubricated with grease or thin oil.

4, multistage pump seal soft packing seal, and mainly of the end cap of the inlet section sealed casing, packing, retaining ring and other components. The water seal water of the D-type multi-stage pump is derived from the pressurized water in the pump. The DG type multistage pump water seal water is derived from external water supply.

5. The multi-stage pump rotary pump is directly driven by the prime mover through the elastic coupling. See the pump from the prime mover end, the pump rotates clockwise D, the DG multi-stage pump is a horizontal single-suction multi-stage centrifugal pump. It is used to transport clean water (containing less than 1% of impurities, less than 0.1mm of particle size) or other liquids with physicochemical properties similar to water. The D-type multi-stage pump has a medium temperature of less than 80 °C and is suitable for mine drainage, oilfield water injection, factory and urban water supply, drainage and other occasions. Oilfield water injection pumps are made of different materials depending on the corrosiveness of the medium. The DG pump has a medium temperature of less than 105 ° C and is suitable for various boiler feed waters.
What is the difference between a multistage pump and a single stage pump?
1. Single-stage pump refers to a pump with only one impeller. The high lift of Zui is only 125 meters;
2, multi-stage pump refers to a pump with two or more impellers, zui high lift can exceed 125 meters; multi-stage pump can increase the number of impellers when the single-stage pump head needs to be equipped with two-stage motor Four-stage motors are used to increase pump life and reduce unit noise, but multi-stage pump repair is a bit more difficult than single-stage pumps.
3. When the actual pump head needs to be less than 125 meters, it can be selected according to the pump room area and pump price (the multi-stage pump is generally higher than the single-stage pump), and other factors such as single-stage pump or multi-stage pump .
With the advancement of technology, the pump of the single-stage impeller can increase the lift of the pump by increasing the speed of the pump, and can replace the multi-stage pump , but the price is more expensive.

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