East Dfms New Double Inlet Level Medium Open Multi-Stage/Multistage Centrifugal Water Pump

01.The first - stage and intermediate - stage impellers are arranged in a back - to - back structure of single - suction impellers. This can effectively balance the axial force generated by the pressure difference on the front and rear sides of the rear cover plate at the suction port of a single - suction impeller. The last - stage impeller is a double - suction impeller, which generates no axial force.

02.The volute casing adopts a double - volute structure to balance radial forces. The transition flow passage adopts a structure with two symmetrically - arranged components spaced 180 degrees apart. This overcomes hydraulic imbalance caused by wear. By applying the design concept of space guide vanes, it minimizes impact wear within the flow passage, preventing vortex - induced wear. It conforms to the flow of water, with no sharp bends, resulting in very low bend - related wear.

03.The new - type seal ring is equipped with two O - ring seals and radial protrusions in the radial direction. The two O - ring seals enhance the sealing performance between the seal ring and the pump body. The outer protrusions on the seal ring can cover part of the gap between the pump body and the seal ring, preventing the conveyed medium (sandy water) from eroding the pump body by impact, thus extending the service life of both the pump body and the seal ring. The design of this seal ring has been granted a "Utility Model Patent Certificate" by the National Intellectual Property Administration.
04.Large - sized pumps adopt a structural form that combines sliding bearings and rolling bearings. Sliding bearings operate stably, reliably, and with low noise. Under liquid lubrication conditions, the sliding surfaces are separated by lubricating oil and do not come into direct contact, reducing friction losses and surface wear, and also lowering the temperature rise of the bearings. To address the axial residual axial force, a combined bearing structure with a rolling bearing installed at the end of the sliding bearing is adopted at the non - drive end. The sliding bearing and the sliding bearing seat are in spherical surface fit, which is beneficial for aligning the bearings at both ends during the assembly of the entire pump unit and simplifies the assembly process of the entire pump unit.
05.Intellectual Property Rights