Other forms of gas-liquid hybrid self-priming pump

The usual gas-liquid hybrid self-priming pump (including the internal mix and external mix), gas-liquid mixing are completed within the centrifugal pump, and the need to have a gas-liquid separation device and the liquid backflow structure. Here is a self-priming pump with gas-liquid mixing done outside of the pump, with no gas-liquid separation and liquid return. The self-priming pump is essentially a combination of a liquid storage tank and a Jin-pass centrifugal pump. Figure 2-25 shows a liquid storage tank. The inlet of the liquid storage tank is connected to the pipeline, and the outlet 2 is connected to the inlet of the centrifugal pump. The first time the pump is turned on, the liquid is filled to the maximum level in the liquid storage tank. After the pump is started, the liquid in the liquid storage tank is discharged. The volume of the liquid storage tank increases with the increase of the volume of gas phase space in the El pipe. Tank, the inlet pipe flow upward impact on the tank after the head bounce back like a waterfall into the liquid tank down, through the liquid flow and the liquid level to form a mixture of gas and liquid, gas and liquid mixture inhaled by the centrifugal pump After the pressure row to the downstream pipeline. Where the gas-liquid mixing process is carried out in the liquid storage tank, the liquid is not recycled during the self-suction process, and the continuous liquid flow from the inlet pipe replaces the reflux liquid flow in the internal and external mixed self-priming pumps, Mixture through the pump outlet, no separate gas-liquid separation device. The self-priming pump self-priming performance depends on the design of the reservoir volume. The reservoir volume should be determined according to the self-priming height and the volume of gas in the inlet pipe. The design should be such that the gas is fully expanded to produce enough vacuum to absorb the liquid And the inlet pipe flow has a certain velocity head. The reservoir is too small, the gas is not fully expanded, the resulting vacuum is not enough to suck the liquid or liquid, but the liquid flow velocity is too small will lead to self-priming pump cut off, unable to complete the intake and exhaust process into normal operation status.

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