The self-priming pump is a self-priming centrifugal pump, which has the advantages of compact structure, convenient operation, stable operation, easy maintenance, high efficiency, long life, and strong self-priming ability. There is no need to install a bottom valve in the pipeline, just make sure that the pump body has a fixed amount of priming before working. Different liquids can use self-priming pumps of different materials.
The working principle of the self-priming pump is that the pump casing is filled with water before the pump is started (or the pump casing itself contains water). After starting, the impeller rotates at high speed to make the water in the impeller channel flow to the volute. At this time, the inlet forms a vacuum, which opens the water inlet check door, and the air in the suction pipe enters the pump and reaches the outer edge through the impeller channel.
The pump adopts the pump body structure of axial liquid return. The pump body is composed of a suction chamber, a liquid storage chamber, a scroll chamber, a liquid return hole, and a gas-liquid separation chamber. After the pump starts normally, the impeller sucks the liquid stored in the suction chamber and the air in the suction pipe together, and the impeller The inside is completely mixed. Under the effect of centrifugal force, the liquid is entrained to flow to the outer edge of the scroll, and a white foam belt with a certain thickness and a high-speed rotating liquid ring are formed on the outer edge of the impeller. The gas-liquid mixture enters the gas-liquid separation chamber through the diffusion tube. At this time, due to the sudden decrease in the flow rate, the lighter gas is separated from the mixed gas liquid, and the gas continues to rise and discharge through the discharge port of the pump body. The degassed liquid returns to the liquid storage chamber, and enters the impeller again through the return hole, mixes again with the gas sucked from the suction line inside the impeller, and flows to the outer edge of the impeller under the action of the high-speed rotating impeller… … As the process continues over and over, the air in the suction line continues to decrease until the gas is exhausted and the self-priming process is completed, and the pump is put into normal operation.
A cooling chamber is also provided at the bottom of the bearing body of some pumps. When the bearing body temperature rise exceeds 70 degrees due to bearing heat, it can be injected into the cooling chamber through any cooling pipe joint and injected with cooling fluid for cooling. The sealing mechanism inside the pump to prevent the leakage of liquid from the high-pressure area to the low-pressure area is the front and rear seal rings. The front seal ring is installed on the pump body, and the rear seal ring is installed on the bearing body. The seal ring wears to a certain extent after long-term operation, and When it affects the efficiency and self-priming performance of the pump, it should be replaced.
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