Multistage pump introduction
First, the multi-stage pump structure Description Multi-stage pump mainly by the stator, rotor, bearing and shaft seal composed of four parts:
1, multi-stage pump stator part mainly by the suction section, the middle, spit section and guide vanes and other components, there are tightening bolts to clamp the sections to form a studio. D-type pump generally horizontal inhalation, vertical spit up; for the injection of oil, 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-pump water seal water from the pump pressure water. DG pump water seal water from the 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 pump is a horizontal single suction multi-stage 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 pump medium temperature less than 80 ℃, suitable for mine drainage, oilfield water, 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 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-stage pump head needs to be equipped with two-stage motor, you can increase the number of impeller Equipped with four motors, which can improve pump life and reduce unit noise, but the multi-stage pump repair relative single-stage pump is a little more difficult.
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.
Second, the multi-stage pump management and maintenance precautions Pumps should be divided into two aspects of electricity and machine, for the machine, mainly to the previous maintenance record transferred out to know. Followed by the electrical aspects, and to understand the power of each pump motor, to his control system have a certain understanding.
Positive Pressure
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