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Self-priming centrifugal pump structure and classification: Self-priming centrifugal pump mainly by the stator, rotor, bearing and shaft seal composed of four parts, by tightening the bolts to each section of the clamp. 1, self-priming centrifugal pump stator mainly by the inhalation section, the middle, spit out the vane and other components constitute the 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. Bearings with grease or thin oil lubrication. 2, self-priming centrifugal pump rotor mainly by the shaft, impeller, balance disc and sleeve and other components. The axial force is balanced by the balance disc. 3, self-priming centrifugal pump bearings mainly by the bearing body, bearing and bearing gland and other components. Mainly by the seal on the water section and the tail cover, packing, retaining ring and other components. D-type pump water seal from the pump pressure water. DG pump seal comes from external water supply. 4, Self-priming centrifugal pump shaft seal with soft packing seal self-priming centrifugal pump with the residue pump, gear pump difference: Pump as a general machinery, its wide range of uses. With the development of self-priming centrifugal pump development, there have been a variety of pumps, its name varied, a variety of self-priming centrifugal pump books on these pumps called and classified are different. So in the product application and promotion caused a lot of trouble. In general, according to the principle of the drainage pump can be divided into: First, the vane pumps such as: self-priming centrifugal pump, mixed flow pump, axial flow pump, cyclone pump; Second, the volume pumps such as: piston pump, gear pump, Three screw pump; Third, other types such as: jet pump, water hammer pump. Self-priming centrifugal pumps have a certain structure and classification, in use in accordance with the structural characteristics of the use of, to ensure that can not be used in the failure, in accordance with certain methods and principles of maintenance.