The multi-stage pump housing is made of stainless steel. The plurality of impellers are mounted on a pump shaft, and work together in series to work. When the liquid passes through each impeller in turn, the energy is sequentially increased by the centrifugal force, and finally the highest lift is obtained. The multi-stage pump is mainly composed of four parts: stator, rotor, bearing and shaft seal. The vibration causes during operation are mainly loose bolts and unbalanced rotor. The solution is to tighten bolts and straighten bearings.
In the multi-stage pump assembly, the multi-stage pump should be coated with a layer of lead powder oil when assembling the bolts and nuts. After assembling the last stage impeller, the axial distance between the hub and the end faces of the balance disc hub is measured, and the axial dimension of the sleeve is determined according to the axial distance. The sum of the axial clearance between the retaining sleeve and the impeller hub, the retaining sleeve and the balance disc hub. Because the multi-stage pump is in the early stage of driving, the parts of the impeller are first affected by the medium of higher temperature, and the shaft is affected by the heat, and their expansion has a time difference. The axial clearance of 0.3~0.5mm is reserved to prevent the impeller and the balance disc from expanding first and then to each other, resulting in a large tensile stress on the shaft.
When installing the balance plate retainer ring, align one of the upper notches with the interface of the balance water pipe. Otherwise, the balance water pipe is blocked and the entire axial balancing device is disabled. Long rod bolts can only be tightened tightly at the beginning of assembly. After the entire multistage pump is on site, the long bolts are tightened according to the recorded data. Be sure to operate symmetrically when tightening, otherwise it will cause poor sealing between the segments.
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. Multi-stage pump pumps are generally horizontally inhaled and spit out vertically; for water injection in oil fields, the pump inlet and outlet are vertically upward. The multi-stage pumping and inlet are all vertically upwards.
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. The multi-stage pump shaft seal is sealed by soft packing, which is mainly composed of sealing body, packing and water retaining ring on the inlet section and the tail cover. The water seal water of the multistage 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. Looking at the pump from the prime mover end, the pump rotates the multi-stage pump in a clockwise direction to be a horizontal single-suction multi-stage centrifugal pump. For transporting clean water or other liquids with physicochemical properties similar to water. Multi-stage pump pump conveying medium temperature is less than 80 °C, suitable for mine drainage, oilfield water injection, factory and city supply, drainage and other occasions. Oilfield water injection pumps are made of different materials depending on the corrosive nature of the medium. The multi-stage pump delivers a medium temperature of less than 105 ° C and is suitable for various boiler feed waters.
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