Self-priming Pump To Be Painted
Before starting the pump, fill the pump casing with water (or there is water in the pump casing). After starting, the impeller rotates at a high speed so that the water in the impeller channel flows to the volute. At this time, a vacuum is formed at the inlet, so that the water inlet check door is opened, and the air in the suction pipe enters the pump and reaches the outer edge through the impeller channel. 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 are many types of self-priming pumps. Among them, the working principle of the externally-mixed self-priming pump is that the pump casing is filled with water (or there is water in the pump casing) before the pump is started. After starting, the impeller rotates at a high speed so that the water in the impeller channel flows to the volute. At this time, a vacuum is formed at the inlet, so that the water inlet check door is opened, and the air in the suction pipe enters the pump and reaches the outer edge through the impeller channel. On the other hand, the water discharged into the gas-water separation chamber by the impeller flows back to the outer edge of the impeller through the left and right return water holes. Under the action of pressure difference and gravity, the water flowing back from the left water return hole is shot into the impeller channel, and is crushed by the impeller. After mixing with the air from the suction pipe, it is thrown to the volute and flows in the direction of rotation. Then it joins with the water from the right return water hole and flows along the volute. Because the liquid continuously impacts the blade cascade in the volute and is continuously broken by the impeller, it is strongly stirred and mixed with the air to generate a gas-water mixture, and it flows continuously so that the gas-water cannot be separated. The mixture is peeled off by the separator tongue at the outlet of the volute and enters the separation chamber along the short tube. The air in the separation chamber is separated and discharged by the outlet pipe, while the water still flows to the outer edge of the impeller through the left and right return water holes, and is mixed with the air in the suction pipe. This repeated cycle gradually exhausts the air in the suction pipeline, so that the water enters the pump to complete the self-priming process.
