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There are many typical structures for self-priming pumps. In the external mixing type, the water discharged by the impeller into the air-water mixing chamber flows back to the outer edge of the impeller through the left and right return holes. The water flowing back through the left return port, under the influence of pressure differences and gravity, is directed into the impeller channels where it is shattered by the impeller. After mixing with the air drawn in through the intake pipeline, this mixture is then sent toward the volute. Vacuum pumps, submersible pumps, metering pumps, gear pumps, pumps resistant to corrosion, acid-resistant pumps, and fire pumps all operate in a direction that causes twisting. Then it merges with the water coming from the right return hole, flowing along the volute. Because the liquid keeps hitting the blade rows inside the volute and is constantly broken up by the impeller, it mixes violently with the air, resulting in a turbid mixture of combat energy and water; this continuous mixing prevents the combat energy and water from separating. The turbid matter is separated by the baffle at the volute outlet and enters the dispersion chamber through a short pipe. In the dispersion chamber, the air is dispersed and discharged through the outlet pipe, while water continues to flow toward the outer edge of the impeller via the return holes, mixing with the air in the inlet pipe. Through such repeated cycles, the air in the suction line is gradually expelled, allowing water to enter the pump and completing the self-priming process.