Gas liquid fraction of stainless steel self-priming pump

Recognition of the volume of gas-liquid separation chamber and outlet height of stainless steel self-priming pump: gas-liquid separation refers to the part outside the pressure chamber of the pump body, and the increasing effect is not obvious. The height from the outlet of the pump body to the center line of the impeller can be determined according to the liquid storage volume. For internal mixing centrifugal self-priming pump, the area of the return hole has a great influence on the self-priming function, so that the liquid returned to the inlet of the impeller through the return hole Many, self-priming, high vacuum height.
Recognition of the clearance between the tongue and impeller in the upper press out chamber: for centrifugal self-priming pump, the clearance between the tongue and impeller has a great influence on the self-priming function. The smaller the clearance between the tongue and impeller in the upper press out chamber, the shorter the self-priming time.
Turning the impeller back cover plate: for the external mixing centrifugal self-priming pump, when the impeller outer circle speed is less than, the self-priming effect is poor. The method of turning the impeller back cover plate is selected to improve the self-priming ability, so as to avoid the circulation of liquid with bubbles at the cut back cover plate and affect the self-priming effect.
Stainless steel self-priming pump can take the initiative to suck up water before the first start-up, and then after the start-up of self-priming pump. It is also very convenient to use. It is widely used in farmland sprinkler irrigation water conservancy projects in China. Before the initiation, there is always a part of water in the pump shell of the self-priming pump. When the impeller of the self-priming pump rolls, the stored water is thrown to the outer edge of the impeller under the effect of centrifugal force, and when the air-water mixture flows to the air-water separation chamber.
As the cross-section increases, the velocity of the air-water mixture decreases, and the air overflows from the exit of the separation chamber. Under the effect of self weight, the water flows back along the lower part of the volute flow passage, and enters the flow passage of the pump shell to mix with the air in the pump again. Then the water flow speed in the inlet pipe is accelerated, and the self-priming effect of the self-priming pump is achieved. The main parts of the self-priming pump are basically the same as the single-stage single suction centrifugal pump.
The method of air supply can not avoid cavitation, but proper air supply can reduce the damage of the channel wall caused by the cavity rupture. The air supply is like a layer of sponge to protect the channel wall. Because the amount of air supply is difficult to grasp, the use of it is very small, so as to achieve good results, the flow, head and power of the pump will decrease a lot, causing adverse consequences.

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