How does an electric water pump work?

The principle of the electric water pump is: the circular motion of the motor makes the diaphragm inside the centrifugal water pump reciprocate through the mechanical device, thereby compressing and stretching the air in the pump chamber (fixed volume). The positive pressure is formed at outlet and a vacuum is formed at inlet under the action of the one-way valve, thereby creating a pressure difference with the outside atmospheric pressure. The pressure difference forced the water into inlet and drain from outlet. The water is continuously in and out under motor energy, forming a relatively stable flow rate.