This type of pump adopts an external mixed type axial return hydraulic pump body structure. The pump body is composed of a suction chamber, a liquid storage chamber, a return orifice and a gas-liquid separation chamber. After the pump is started, the impeller sucks in the liquid stored in the suction chamber and the air in the suction pipe, and is completely mixed in the impeller. Under the action of the centrifugal force, the mixed liquid passes through the pressure chamber and enters the gas-liquid separation chamber, due to the light weight of the gas. The gas is separated from the liquid and discharged from the outlet pipe, and the liquid sinks in the gas-liquid separation chamber, returning to the outer edge of the impeller with the return hole, and undergoing another gas-liquid mixing-separation process, which in turn circulates. Until the gas in the suction pipe is drained and full of liquid, the self-priming process is completed; when the water flows out of the impeller, a vacuum occurs in the central part of the impeller, and the water in the suction pool enters the impeller through the water pipe under the action of atmospheric pressure, and the water also rotates as the impeller rotates continuously. Continuously discharge and inhale to form a continuous pumping action.
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