Structure and working principle of multistage pumps

Multistage pumps consist of multiple levels of impellers and casings, each of which can further increase the pressure of the liquid. This type of pump is usually used to handle fluids that require high pressure, such as water supply systems, chemical processes, and energy industries. Multistage pumps can be designed into different types according to specific needs, such as centrifugal multistage pumps and axial flow multistage pumps. Centrifugal multistage pumps use the rotating impeller to push the liquid to the next level through centrifugal force to increase the pressure. The axial flow multistage pump uses the principle that the direction of liquid flow is parallel to the axis to continuously force the liquid on the impeller to achieve the effect of increasing pressure.

These different types of multistage pumps are suitable for different working conditions and liquid characteristics. The operation of multistage pumps requires attention to reasonable lubrication and cooling to ensure the stable operation and long life of the pump. When selecting a multistage pump, factors such as the flow rate, pressure requirements, and working environment of the liquid need to be considered to ensure the performance and safety of the pump. In short, multistage pumps are a very important industrial equipment that is widely used in various fields and provides a reliable solution for industrial production and domestic water supply.

Working principle of multi-stage pump
The liquid to be transported enters the suction port of the pump at a given pressure. Due to the action of the impeller, the kinetic energy and potential energy of the liquid are increased. After the liquid enters the guide vane, part of the kinetic energy is converted into potential energy (each stage of the impeller is equipped with a guide vane). The reverse blade of the guide vane transports the liquid to the inlet of the next stage of the impeller under favorable hydraulic characteristics.

Due to the repetition of this process from one stage to another, the same pressure is increased at each stage. After passing through the last stage guide vane, the fluid enters the annular chamber of the cylindrical body and finally enters the discharge pipe through the discharge port.