NS-50 self-priming water pump

The self-priming pump is a self-priming centrifugal pump with the advantages of compact structure, convenient operation, stable operation, easy maintenance, high efficiency, long life, and strong self-priming ability. Before working, you only need to ensure that there is a certain amount of liquid in the pump body. One machine can handle many occasions.

The working principle of the self-priming pump is to fill the pump casing with water before starting the water pump (or there is water in the pump casing itself). After starting, the impeller rotates at high speed to make the water in the impeller groove flow to the volute. At this time, a vacuum is formed at the inlet, so that the water inlet check valve opens, and the air in the suction pipe enters the pump and reaches the outer edge through the impeller groove. On the other hand, the water discharged by the impeller into the air-water separation chamber flows back to the outer edge of the impeller through the left and right return holes. The water flowing back from the left return hole is ejected into the impeller groove under the action of pressure difference and gravity, and after mixing with the air from the suction pipe, it is thrown to the volute and flows in the direction of rotation. Then it merges with the water flowing from the right return hole and flows along the volute. As the liquid continuously impacts the blades in the volute and is continuously crushed by the impeller, it is strongly mixed with the air to form a gas-water mixture, which continuously flows so that the gas and water cannot be separated. The mixture is peeled off by the tongue at the outlet of the volute and enters the separation chamber along the short pipe. The air in the separation chamber is separated and discharged from the outlet pipe, while the water still flows to the outer edge of the impeller through the left and right return holes and mixes with the air in the suction pipe. This cycle is repeated, gradually exhausting the air in the suction pipe, allowing water to enter the pump, and completing the self-priming process.

Self-priming pumps are suitable for clean water, seawater, chemical medium liquids with acidity and alkalinity, and slurries with general paste (medium viscosity ≤100 centipoise, solid content can reach less than 30%). It can be used with filter presses of any model and specification to send the slurry to the filter press for filtration. For example, the ZW self-priming non-clogging sewage pump can pump dirt, sediment, waste mine impurities, feces treatment and all engineering sewage and colloidal liquids containing large solid particles with a diameter of 60% of the outlet diameter and a fiber length of 1.5 times the impeller diameter.