Acid and alkali resistant self-priming pump can achieve the effect of exhaust and irrigation of inlet pipeline with the help of its own device characteristics without irrigation before starting. Self priming pump is divided into the following categories according to the action principle: 1. Gas liquid mixing type (including internal mixing type and external mixing type); 2. Water ring wheel type; 3. Jet type (including liquid jet and gas jet) Working process of air-water mixed self-priming pump: due to the special structure of the self-priming pump body, after the pump stops running, there is a certain amount of water in the pump body. After the pump is restarted, due to the rotation of the impeller, the air and water in the suction pipe are fully mixed and discharged into the air-water separation chamber. The air and water overflow from the upper part of the chamber, and the water in the lower part returns to the impeller, and is mixed with the remaining air in the suction pipe again, until all the gas in the pump and suction pipe is discharged to complete self-priming Self priming non clogging sewage pump is applicable to chemical, petroleum, pharmaceutical, mining, papermaking, fiber, pulp, textile, food, power plant and municipal sewage projects, sewage discharge of public facilities, pond aquaculture and other industries The acid and alkali resistant self-priming pump flows in the direction of rotation. Then it combines with the water from the right return hole and flows along the volute As the liquid constantly impacts the cascade in the volute and is constantly broken by the impeller, it is strongly stirred and mixed with the air to generate a gas water mixture, which flows continuously, so that the gas and water cannot be separated. The mixture is stripped by the tongue at the volute outlet and enters the separation chamber along the short pipe In the separation room, the air 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 holes, and is mixed with the air in the suction pipe. Such repeated circulation gradually exhausts the air in the suction pipe, so that the water enters the pump to complete the self-priming process Working principle of acid and alkali resistant self-priming pump: Fill the pump casing with water before starting the pump (or there is water in the pump casing itself) After starting, the impeller rotates at a high speed to make the water in the impeller channel flow to the volute. At this time, a vacuum is formed at the inlet, so that the water inlet check valve 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 service life, and strong self-priming capacity. There is no need to install the bottom valve in the pipeline, and it is only necessary to ensure that a certain amount of liquid is stored in the pump before work. Self priming pumps of different materials can be used for different liquids

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