Working principle of self priming pump

The pump adopts an axial return liquid pump body structure. The pump body is composed of a suction chamber, a liquid storage chamber, a scroll chamber, a liquid return hole, a gas-liquid separation chamber, etc. After the pump starts normally, the impeller sucks the liquid in the suction chamber and the air in the suction pipeline together, and is fully mixed in the impeller. Under the effect of centrifugal force, the liquid carries gas to the outer edge of the scroll chamber, forming a white foam belt with a certain thickness and a high-speed rotating liquid ring on the outer edge of the impeller. The gas-liquid mixture enters the gas-liquid separation chamber through a diffusion tube. At this point, due to a sudden decrease in flow rate, lighter gas is separated from the mixed gas and liquid, and the gas continues to rise and discharge through the pump outlet. After degassing, the liquid returns to the storage chamber and enters the impeller again through the reflux hole. It mixes with the gas sucked in from the suction pipeline inside the impeller and flows back to the outer edge of the impeller under the action of the high-speed rotating impeller. As this process continues in a cyclic manner, the air in the suction pipeline continuously decreases until the gas is completely absorbed, completing the self suction process, and the pump is put into normal operation.
Some pumps also have cooling chambers at the bottom of their bearing bodies. When the bearing heats up and causes the temperature of the bearing to rise by more than 70 degrees, any coolant pipe joint can be used to inject coolant for circulating cooling in the cooling chamber. The sealing mechanism inside the pump to prevent liquid leakage from the high-pressure area to the low-pressure area is the front and rear sealing rings. The front sealing ring is installed on the pump body, and the rear sealing ring is installed on the bearing body. When the sealing ring of the pump is worn to a certain extent after long-term operation and affects the efficiency and self suction performance of the pump, it should be replaced.