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The difference between the self-priming pump and the centrifugal pump is that the inlet pipe of the self-priming pump does not need to be installed with a bottom valve. After the first filling of the water, the water can be sucked up, and after that, no more water is needed. The pump body is much larger than the centrifugal pump, with its own water storage function, and has a lifelong self-priming function. The centrifugal pump has the function of boosting pressure, and the liquid level must be higher than the pump to be able to flow into the pump body to start. If the liquid level is lower than the centrifugal pump, the bottom valve can only be installed at the suction port of the inlet pipe to fill the pump and the pipe with liquid to achieve the self-priming function, or the water suction cylinder can be installed at the inlet, such as the centrifugal pump that does not work for a long time, and the inlet pipe and the pump body can be started at the second start-up. The water in the pump is basically gone, and it needs to be filled again for water diversion. The operation is troublesome. Because the bottom valve at the inlet of the centrifugal pump which has not been used for a long time cannot be sealed completely, the liquid will slowly leak back to the water tank, so the self-priming pump is better than the centrifugal pump when the self-priming function is needed.
The self-priming and centrifugal pumps adopt the pump body structure of axial liquid return. The centrifugal pump body is composed of suction chamber, storage chamber, scroll chamber, return hole, gas-liquid separation chamber, etc. after the normal startup of the centrifugal pump, the impeller sucks the liquid in the suction chamber and the air in the suction pipe together, and it can be completely mixed in the impeller. Under the effect of centrifugal force, the liquid entrained with this gas flows to the outer edge of the scroll chamber, forming a certain thickness of white on the outer edge of the impeller. Color foam tape and high speed rotating liquid ring. The gas-liquid mixture enters the gas separation chamber through the diffusion tube.
At this time, due to the sudden decrease of the flow rate, the lighter gas is separated from the mixed liquid, and the gas continues to rise and discharge through the discharge outlet of the pump body. After degassing, the liquid returns to the liquid storage chamber, enters the impeller again through the return hole, mixes with the gas sucked in from the suction pipe inside the impeller again, and flows to the outer edge of the impeller under the action of the high-speed rotating impeller.... With this process going on again and again, the air in the suction pipe is continuously reduced until the air is exhausted, the self-priming pump completes the self-priming process, and the centrifugal pump is put into normal operation. Because the centrifugal pump has this unique exhaust capacity, the self-priming pump can deliver liquid containing gas, without the need to install a bottom valve, and has a good sweeping function when used on a cruise ship.
