1. Open the water inlet, fill it with water, and then close it; Turn on the power and wait for 3-5 minutes to release the air; 3. If the water still does not come out, check the sealing for air leakage.

Centrifugal pump: using impeller rotation to generate centrifugal force to transport liquids; Positive displacement pumps, such as plunger pumps and gear pumps, transport liquids through cavity changes; Submersible pump: The motor and pump body are integrated and fully immersed in the liquid for operation; Self suction pump: It can automatically empty air and absorb water when used for the first time.

Cavitation refers to the phenomenon where the local pressure of a water pump is too low, causing the liquid to vaporize and form bubbles. When the bubbles burst, they impact the impeller and pump casing, causing vibration, noise, and even damage. Preventive methods include reducing installation height, increasing inlet pipe diameter, or using anti cavitation materials.

A water pump is a fluid mechanical device that uses mechanical energy to transport liquid from low to high or increase liquid pressure. The core principle is to do work on the liquid through impeller rotation (centrifugal pump) or volume change (volumetric pump), converting mechanical energy into kinetic and potential energy of the liquid. According to the Bernoulli equation, after obtaining energy in the pump, the liquid can overcome pipeline resistance and height differences to achieve transportation.