Factors affecting self priming performance of self-priming pump

1. The volume of liquid storage room can shorten the time of self absorption to different degrees for the volume of liquid storage room and the capacity of liquid storage.

2, the impeller outlet width and the section area of the cochlear chamber are favorable for the external mixing self suction sewage pump / wider impeller outlet width and the section of the cochlear chamber, which is conducive to the full mixing of gas and liquid and the reduction of self suction time.

3, the clearance between the impeller and the tongue tongue to the gas-liquid mixture scraping the outer edge of the impeller, prevent the gas-liquid mixture in volute chamber in situ cycle, the tongue is smaller and more impeller clearance, gas-liquid mixture discharge volute chamber, self-priming time is shorter, but the gap is too small to pump / large flow noise.

4. The reflux hole position is different from the reflow hole of the self - priming pump, and the self - suction effect is different, usually arranged near the lowest position of the pump volute.

5. The reflux hole area test shows that the area of the reflux hole has an optimum value. The area of reflux hole is less than that of the best value, and the time of self-priming is prolonged; the area of reflux hole is greater than that of the best value, and both the self suction height and the pump efficiency will decrease.

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