D. Overview of DG, DM, DF series horizontal single suction multi-stage centrifugal pumps
The D-type pump is used for conveying clean water or liquids with physical and chemical properties similar to water that do not contain solid particles and have a temperature below 80 ℃. It is suitable for use in mining and urban water supply and drainage engineering The DM type pump is used to transport neutral mineral water (particle size less than 0.5 millimeters) with a solid particle content of no more than 1.5% and similar other wastewater. The temperature of the transported medium is not greater than 80 ℃, and it is suitable for applications such as steel plants, mine drainage, and wastewater transportation. DG type pumps transport clean water or liquids with physical and chemical properties similar to clean water that do not contain solid particles and have a temperature not exceeding 105 ℃. They are suitable for boiler feedwater, or for transporting hot water or media similar to hot water. The DF type pump is capable of transporting liquids at temperatures ranging from -20 ℃ to 105 ℃, free of solid particles and corrosive. The allowable inlet pressure of the pump is 0.6MPa. D. The performance range of the design points for four types of pumps, DM, DG, DF, etc., is as follows: Q=6.3~450m3/h H=50~650m
D. DG, DM, DF series horizontal single suction multi-stage centrifugal pump model meaning

D. DG, DM, DF series horizontal single suction multi-stage centrifugal pump structure
D. DG, DM, DF series horizontal single suction multi-stage segmented centrifugal pumps are mainly composed of four parts: stator, rotor, bearing, and shaft seal. The stator part is mainly composed of a suction section, a middle section, a discharge section, guide vanes, etc., which are clamped by tightening bolts to form a working chamber. The suction inlet of the D-type pump is horizontal, and the outlet is vertically upward. The inlet and outlet of DG type pumps are both vertically upward.
The rotor part is mainly composed of a shaft, impeller, balance disk, shaft sleeve, etc. The shaft transmits power to the impeller to make it work; Balance disk is used to balance axial forces; The shaft is equipped with replaceable bearings to protect the shaft.
The bearing part is mainly composed of bearing body, bearing, bearing cover, etc. The rotor is supported by two single row roller bearings installed in the bearing body at both ends, and the bearings are lubricated with grease. The shaft seal adopts packing seal, mainly composed of suction section, packing box body, packing, water blocking ring, etc. A certain pressure of water is introduced into the sealed chamber to serve as a water seal, water cooling, and water lubrication. The water seal of D-type pump comes from the pressure water inside the pump; The water seal of DG, DM, and DF pumps comes from external water supply. DG and DF pumps can also be equipped with mechanical seals or floating ring seals. Transmission, the pump is directly driven by an electric motor through an elastic coupling. From the motor end, the pump rotates clockwise. precautions
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