The principle of multistage pump, who can best tell me the principle of multistage pump?

Multistage pump, also known as multistage centrifugal pump, is a kind of equipment commonly used in water pump and valve machinery. Before using it, it is necessary for us to understand its performance and working principle. The following introduces the working principle of multi-stage pump.

Multistage pump is actually a kind of centrifugal pump, which is composed of two or more centrifugal pumps with the same function. In the flow channel structure, the water outlet of the first stage and the water inlet of the second stage are connected in series to form a multi-stage centrifugal pump.

The output water pressure of multistage pump may be very high. It is a centrifugal pump, and it also depends on the rotation of the impeller to obtain centrifugal force, so as to carry out transportation. When the gas density reaches the working range of mechanical vacuum pump, it is pumped out, thus gradually obtaining high vacuum. Multi-stage pump relies on the change of pump cavity volume to realize suction, compression and discharge, so it is also a centrifugal pump with variable volume.

When the impeller on the motor drive shaft of multistage centrifugal pump rotates at high speed, the liquid filled in the impeller will be thrown around the impeller from the middle of the impeller along the flow path between blades, and the pressure and speed will increase at the same time, and will be guided to the lower impeller through the flow path of the guide shell. In this way, all impellers and guide shells flow in succession, further increasing the pressure energy of the liquid. After stacking each impeller step by step, a certain lift is obtained.