What are the structural and configuration requirements for self priming pumps?

1. The impeller is not blocked. Usually, it is made into an open impeller. However, as long as the flow path in the impeller is wide enough, it is also possible to seal the impeller.
2. The back of the impeller is equipped with rear blades to prevent self suction from immersing in the packing box. Similarly, fresh water is also injected into the sealing device.
3. The size of the self priming pump body should not be blocked by self suction. For cleaning purposes, there are large holes everywhere or structures that allow for easy removal of end caps. The structure in front of the suction port of the self-priming pump should make it easy for self-priming to flow. Therefore, the suction pipe of the self priming pump should be thick and short, and the liquid level in the suction side tank should be as high as possible. The inlet of the main blade is twisted in a mixed flow manner, so the incoming self suction is easily absorbed. In high concentration conditions, a pressure of at least 2 meters must be applied to the water head from the pump shaft to the suction surface, and the pressurized impeller must be installed in front of the main impeller.
4. Due to the high friction loss in the tube at high concentrations, it is necessary to ensure that the extrusion tube has no resistance to blockage and divergence.
5. Stir the slurry thoroughly and ensure that the self priming pump flows as evenly as possible to the suction port.
6. The air contained in self suction should be discharged as much as possible before entering the impeller. This is very important because when the liquid contains air, the performance of the self priming pump will be greatly reduced. In addition, the storage of air will make the operation of the pump unstable. Therefore, a structure should be adopted to prevent air from being trapped in the pump body.