Difference between self suction centrifugal pump and general centrifugal pump

Self priming pump is also a centrifugal pump, it is divided into self-priming and general suction, often customers do not understand the difference between self-priming centrifugal pump and general centrifugal pump. 

The main reason is that the inlet pipe of the self-priming pump does not need to be installed with a bottom valve. After the water is filled for the first time, the water can be sucked up. There is no need to add water in the future. The pump body is larger than the centrifugal pump, Many of them have the function of water storage and life-long self-priming. Centrifugal pumps play a role of pressurization. The liquid level must be higher than the pump and can flow into the pump body before starting. If the liquid level is lower than that of the centrifugal pump, the bottom valve can only be installed at the suction inlet of the inlet pipe to fill the pump and pipeline with liquid, or install a draft tube at the inlet, such as For a centrifugal pump that has not worked for a long time, the water in the inlet pipe and pump body is basically gone when the pump is started for the second time. It is troublesome to operate again because the sealing of the inlet bottom valve of the centrifugal pump that has not been used for a long time can not achieve the effect of complete sealing, and the liquid will slowly leak back to the pool. Therefore, in the working conditions requiring self-priming function, the self-priming pump has better effect than the centrifugal pump Better. 

The self-priming centrifugal pump adopts the pump body structure of axial return liquid. The centrifugal pump body is composed of suction chamber, liquid storage chamber, scroll chamber, return hole, gas-liquid separation chamber, etc. after the centrifugal pump starts normally, the impeller will absorb the liquid stored in the suction chamber and the air in the suction pipe together, and can be completely mixed in the impeller. Under the action of centrifugal force, the liquid entrained with the 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 a 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 pump body outlet. The degassed liquid returns to the liquid storage chamber, and enters the impeller again through the return hole, and mixes with the gas inhaled 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.

As this process goes 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 transport liquid containing gas without installing bottom valve. It has good sweeping function when used on cruise ship.

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