Multi-stage pump mainly consists of four parts: stator, rotor, bearing and shaft seal: 1, multi-stage pump stator part mainly by the suction section, middle section, spit section and guide vane and other components, Constitute a studio. D-type multi-stage pump generally horizontal suction, spit up vertically; for the injection of oil fields, the pump import and export are up vertically. DG multi-stage pump out, the entrance are up vertically. 2, multi-stage pump rotor mainly by the shaft, impeller, balance disc and shaft sleeve and other components. The axial force is balanced by the balance disc. 3, multi-stage pump bearings mainly by the bearing body, bearing and bearing gland and other components, bearing grease or thin oil lubrication. 4, multi-stage pump shaft seal with a soft packing seal, mainly by the sealing section of the water section and the tail cover, packing, retaining ring and other components. D-type multi-stage pump seal water from the pump pressure water. DG multi-stage pump water seal water from external water supply. 5, multi-stage pump rotary pump directly driven by the prime mover through a flexible coupling. From the original motivation to see the pump, the pump rotates clockwise D, DG-type multi-stage pump is a horizontal single-suction multi-stage segmented centrifugal pump. For the transport of water (containing less than 1% impurity, particle size less than 0.1mm) or other physical and chemical properties similar to water. D-type multi-stage pump pump medium temperature is less than 80 ℃, suitable for mine drainage, oilfield waterflooding, factories and cities to the drainage and other occasions. Oilfield water injection pump according to the corrosive nature of the pump using different materials. DG-type pump medium temperature less than 105 ℃, suitable for a variety of boiler feed water. What is the difference between multi-stage pump and single-stage pump? 1, single-stage pump is only one impeller pump, the highest lift is only 125 meters; 2, multi-stage pump refers to the pump with two or more impellers, the maximum lift can be more than 125 meters; multi-stage pump in the single Pump head needs to be equipped with two-stage motor, the impeller can be increased by increasing the number of four motor, which can improve pump life and reduce unit noise, but the multi-stage pump repair relative single-stage pump is difficult a little. 3, the pump actually needs less than 125 meters head, according to pump room area, pump price (multi-stage pump generally higher than the single-stage pump price), and other factors considering the choice of single-stage pump or multi-stage pump. As technology advances, single-stage impeller pump can improve the pump lift by increasing the pump speed, instead of multi-stage pump, but the price is a little expensive.
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