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Self-priming pump structure of many types, of which, on the other hand, the impeller is discharged into the gas-water separation chamber and the water back through the left and right holes back to the outer edge of the impeller. Left back to the water back to the water hole in the pressure difference and the role of gravity, fired into the impeller channel, and was crushed by the impeller, and inhaled air to the pipe after mixing thrown volute, vacuum pump liquid metering Pump gear pump corrosion pump acid pump fire pump to rotate the direction of flow. 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, so that water into the pump to complete the process of self-absorption. Sewage pump self-priming pump oil pump diaphragm pump screw pump gear pump mixed self-priming pump, working principle and external mixed self-priming pump the same, the difference is that the return water does not flow to the outer edge of the impeller, and flow impeller entrance. Internal hybrid self-priming 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. In addition to the pump itself and the structural characteristics of the water inlet pipe installation conditions on the self-priming performance of the major impact, under certain circumstances, the outlet pipe will have an impact on self-priming performance. Self-priming pump outlet section of self-priming water Self-priming suction pump pressure has not yet fully established circulating pump body water circulation, but the flow of water and the outlet pipe. Self-priming pump on the pump out of the water runner and outlet through, the outlet channel has a window and gas-water separation chamber connected from the impeller out of the water flow into the outlet pipe, if the outlet pipe is longer (1M above) As the pressure is not enough water will not flow out of the water from the window into the gas-water separation chamber, the separation of gas from the window into the outlet pipe up and discharge. If the outlet pipe is short, water pressure can drain water from the outlet pipe and pump memory water will decrease. When reduced to a certain extent, the pump no longer reduce the circulating water, but then little water storage. For the pump body outlet channel and the pump outlet separately, ask a large gas-water separation chamber self-priming pump body. Impeller out of the water is not directly aligned with the outlet, when the water pressure is not easy to come out, observe this structure of the self-priming pump, you can see self-priming water in the pump above the formation of a large vortex, not easy to overflow , This structure of the outlet pipe has little effect on self-suction water. Self-priming pump self-priming air-water mixture layer formed by the impeller, if too little water, air-water mixed platform is very thin, less pumping capacity, very little water, can not effectively isolate the import and export of cavities, or even the same import The degree of vacuum is destroyed. Figure 4 is a different amount of water pump inlet vacuum test results. From the test we can see that the pump is less than 1.62, the pump can not be continuously evacuated, the water table 21 began to maintain a steady vacuum evacuation, water storage and then increase the degree of vacuum also increased. After saving to a certain value, the vacuum will not increase any more. This rule for a variety of self-priming centrifugal pumps are the same, but its value varies. 4TC-80 pump self-priming vacuum test results. 4TC-80 Flow rate: 7.8 liters / sec Pump body water volume of l3 liters, the factory test, to achieve adequate water requirements. However, the 13L is still when the self-priming pump body to save the water found in use, when the 4TC-80 out of the paragraph is only 0.3m high, self-priming water will rush out, shut down to check the water surface down l40mm, 72,62 to reduce the dynamic self-suction capacity of water storage is very low, the actual water can not be self-priming.