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3G three screw pump selection, as much as possible to understand the conditions of the pump in detail, in addition to operating parameters, such as flow, pressure to be clear, the characteristics of the medium transported, such as media corrosive, gas content and solid particle size, Medium temperature, viscosity, weight, etc. should understand. Three screw pump in China's oil, chemical, metallurgy, shipbuilding and other industries are widely used, the pump in many areas instead of centrifugal pump and gear pump. 3G triple screw pump has a long service life, high efficiency, low energy consumption, low noise, and so on. The insulation screw pump standard by GB10887-89 design. Three screw pump itself consists of only three screws, but there are a variety of structures, the general small flow, 0.2-6.5m3 / h pump body and bushing into a horizontal installation, shaft seal for the mechanical seal. Pump bushing above medium flow is fixed to the pump body as a separate part. Large flow pump made of double suction structure. Shaft according to the different media have a mechanical seal and packing seal two. The prime mover for marine pumps is AC marine motor. Three screw pump assembly considerations: 1, the assembly screw pump parts should be carefully cleaned, check, damaged parts should be replaced; 2, the drive shaft twenty thousand joint assembly, you should check the ring is damaged, in the air Cavity filled with grease; 3, the correct installation of bearings so that the shaft rotation flexibility, no jamming phenomenon. 4, shaft seal installation: packing box installed, the packing gland should be tight bolt position in the housing installation window, easy Wrench adjustment bolts; 5, the body pressed tight, the nut tightening should be uniform; 6, mechanical seal installation should be careful, friction deputy face should be clean and coated with grease; 7, Stator cavity surface, is conducive to stator installation; 8, installation and assembly, the coupling installation deviation △ Y ≤ 0.2mm, △ α ≤ 30 '.