1. Single stage centrifugal pump

Working principle: When a centrifugal pump is working, the liquid fills the pump casing, the impeller rotates at high speed, and the liquid produces high speed under the action of centrifugal force. The high-speed liquid passes through the gradually expanding pump casing channel, and the dynamic pressure head is transformed into a static pressure head.

It is often used in situations where the head is less than 50 meters, such as circulating water pumps.

2. Multistage centrifugal pump

Working principle: two-stage or multi-stage impeller, with the outlet of the previous impeller being the inlet of the next impeller. The head can be increased or decreased according to the number of stages of the water pump impeller as needed.

There are two types of multi-stage centrifugal pumps: vertical and horizontal. For example, boiler feed pumps.

3. Axial flow pipeline pump

Working principle: The impeller of the axial flow pipeline pump is designed as an axial flow type with high rotational speed. If the motor power, impeller diameter, and pipeline diameter are large enough, the flow rate can be large.

Water supply pressurization, such as supplying water to high-rise buildings.

4. Gear pump

Working principle: The two gears of a gear pump are generally of the same size. The teeth of the gears separate from each other, forming a low pressure. Liquid is brought in between the crowns of the two gears and sent along the shell wall to the other side. The two gears on the other side close together, forming high pressure to discharge the liquid. There are two gears and three gear pumps.

Like a gear oil pump, the pressure can be as high as 3.0MPa.

5. Screw pump

Working principle: Twin screw pumps are very similar to gear pumps, where one screw rotates and drives the other screw. The liquid is intercepted in the meshing chamber, pushed forward along the rod axis, and then squeezed towards the center for discharge.