What is the working principle of the self-priming pump ? Ordinary centrifugal pump , if the suction liquid level is under the impeller, it should be pre-filled when starting, which is very inconvenient. In order to store water in the pump, the inlet of the suction pipe requires a bottom valve. When the pump is working, the bottom valve causes a large hydraulic loss. The so-called self - priming pump does not need to be filled before starting (the water is still needed after the installation is started *). After a short period of operation, the pump itself can be sucked up and put into normal operation. Self-priming pumps are divided into the following categories according to the principle of action: 1. Gas-liquid mixing (including internal mixing and external mixing); 2. Water ring wheel type; 3. Jet type (including liquid jet and gas jet). Working process of gas-liquid hybrid self - priming pump : Due to the special structure of the self-priming pump body, after the pump stops, there is a certain amount of water in the pump body. After the pump is started again, the air and water in the pipeline are sucked in due to the rotation of the impeller. Fully mixed, and discharged to the gas-water separation chamber, the gas in the upper part of the gas-water separation chamber overflows, the lower water returns to the impeller, and re-mixes with the remaining air in the suction line until all the gas in the pump and the suction pipe is discharged. Suck and pump normally. The water ring wheel type self-priming pump combines the water ring wheel and the water pump impeller in one casing, and discharges the gas by means of the water ring wheel to realize self-priming. When the pump is working normally, the passage of the water ring wheel and the pump impeller can be intercepted by the valve, and the liquid in the water ring wheel can be drained. The jet self - priming pump is a combination of a centrifugal pump and a jet pump (or ejector), which relies on a spraying device to cause a vacuum at the nozzle to achieve suction.
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