Other forms of gas-liquid mixing self-priming pump

The usual gas-liquid hybrid self - priming pump (including internal mixing and external mixing), gas-liquid mixing is completed inside the centrifugal pump , and a gas-liquid separation device and a liquid reflux structure are required. Here is a self-priming pump with gas-liquid mixing completed outside the pump, without gas-liquid separation and liquid reflux structure. The self-priming pump is essentially a combination of a liquid storage tank and a Jintong centrifugal pump.

Figure 2-25 shows a liquid storage tank with the inlet of the reservoir connected to the pipe and the outlet 2 connected to the inlet of the centrifugal pump. * Adding liquid to the large liquid level of the Zui before the water pump is started, the liquid in the liquid storage tank is discharged after the pump is started, and the liquid volume in the liquid storage tank together with the volume of the gas phase in the El pipe is reduced, and the liquid in the inlet pipe is sucked into the liquid storage. The tank and the inlet pipe flow impinge upwards to the liquid storage tank, and the head is rebounded and falls into the liquid in the tank like a waterfall. The gas-liquid mixture is formed by the collision of the liquid flow and the liquid surface, and the gas-liquid mixture is sucked by the centrifugal pump. After pressurization, drain to the downstream pipeline. Here, the gas-liquid mixing process is carried out in a liquid storage tank, and the liquid is not recycled during the self-priming process, and the continuous liquid flow from the inlet pipe replaces the reflux liquid flow in the internal mixing and external mixing self-priming pumps, gas-liquid The mixture is discharged through the pump outlet without a separate gas-liquid separation device. The self-priming performance of the self-priming pump depends on the design of the volume of the liquid storage tank. The volume of the liquid storage tank should be determined according to the self-priming height and the gas volume in the inlet pipe. The gas should be designed to expand sufficiently to generate sufficient vacuum to suck the liquid. The inlet pipe flow has a certain velocity head. The liquid storage tank is too small, the gas expansion is not enough, and the vacuum generated is not enough to suck the liquid or suck the liquid, but the liquid flow speed head is too small, which will cause the self-priming pump to stop flowing, and the suction and exhaust process cannot be completed and transferred to normal operation. status.

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