What is a shielded pump? Shielded pump, also known as unsealed centrifugal pump or low-noise pump. It connects the impeller and the rotor of the electric motor together and immerses them in the conveyed liquid, unlike most centrifugal pumps that are connected to the electric motor through a coupling. They are enclosed within the same shell, without the need for packing or mechanical seals, fundamentally eliminating liquid leakage. In order to prevent contact between the conveyed liquid and the electrical components, the stator and rotor of the motor are isolated from the liquid using non-magnetic metal thin-walled cylinders (shielding sleeves). This is the difference between shielded pumps and centrifugal pumps. The electric motor used in this pump is actually a semi dry submersible motor.
There are many types of shielded pumps, classified according to their working impeller forms, including centrifugal and vortex pumps; According to the number of working impellers, there are single-stage and multi-stage ones; According to the arrangement of its electric motor and pump shaft, there are horizontal and vertical types.
Shielded pumps are suitable for transporting corrosive, flammable, explosive, highly toxic, radioactive, and extremely valuable liquids. It is also suitable for transporting liquids with high pressure, high temperature, low temperature, and high melting point. Due to its ability to prevent liquid leakage, shielded pumps are widely used in defense, chemical, petroleum and other sectors.
Shielded pumps appeared in the 1930s, accounting for more than 20% of the total production of chemical pumps (corrosion-resistant pumps), and many countries have a series of products.
