Self-priming oil pump structure of many types, of which, outside the mixed self-priming pump works is: before starting the pump filled with water in the pump housing (or the pump itself has water). After the start of high-speed rotation of the impeller so that the impeller channel flow of water to the volute, then the entrance to form a vacuum, the inlet valve against the open, the suction pipe into the air within the pump and reach the outer edge of the impeller channel. On the other hand, the water drained by the impeller into the gas-water separation chamber flows back to the outer edge of the impeller through the left and right return holes. The water flowing back from the left backwater hole is directed to the impeller channel under pressure difference and gravity and is crushed by the impeller. After mixing with the air from the suction pipe, it is thrown to the volute and flows in the direction of rotation. Then merge with the water from the right backwater hole and flow down the volute. As the liquid in the volute continuously impact cascades, constantly being crushed by the impeller, with strong air mixing, generating gas and water mixture, and continue to flow so that gas and water can not be separated. The mixture is peeled off the tongue at the volute outlet and enters the separation chamber along the stub tube. The air in the separation chamber is separated and drained by the outlet pipe, while the water is still flowing back and forth to the outer edge of the impeller through the return holes and mixed with the air in the suction pipe. So repeated cycles, and gradually sucked into the air exhaust pipe, the water into the self-suction pump to complete the process of self-absorption. Self mixing oil pump, working principle and external mixing self-priming pump the same, the difference is that the return water does not flow to the outer edge of the impeller, and flow to the impeller entrance. Internal hybrid self-priming oil pump at start-up, to open the back of the impeller before the return valve, so that the liquid pump back to the impeller inlet. The water is mixed with the air from the suction pipe under the action of high speed rotation of the impeller to form a gas-water mixture to be discharged to the separation chamber. Here the air is drained and the water returns from the return valve to the impeller entrance. So repeated until the air exhausted, sucked in water.
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