The impeller is installed inside the pump casing and fastened to the pump shaft, which is directly driven by the motor. There is a liquid suction and suction pipe connected in the center of the pump casing. The liquid enters the pump through the bottom valve and suction pipe. The liquid discharge port on the pump casing is connected to the discharge pipe.

Before starting the pump, fill the pump casing with the liquid being transported; After starting, the impeller is driven by the shaft to rotate at high speed, and the liquid between the blades must also rotate along with it. Under the action of centrifugal force, the liquid is thrown from the center of the impeller to the outer edge and gains energy, leaving the outer edge of the impeller at high speed and entering the volute pump casing. In the snail shell, the liquid slows down due to the gradual expansion of the flow channel, and converts some of its kinetic energy into static pressure energy. Finally, it flows into the discharge pipeline at a higher pressure and is delivered to the required location. When the liquid flows from the center of the impeller to the outer edge, a certain vacuum is formed at the center of the impeller. Due to the pressure above the liquid level in the storage tank being greater than the pressure at the pump inlet, the liquid is continuously pressed into the impeller. It can be seen that as long as the impeller continues to rotate, the liquid will be continuously sucked in and discharged.