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On the other hand, by separating gas and water into the impeller chamber and the water flow by about hole to return to the outer edge of the impeller. Backwater hole left back at the water pressure difference and gravity, fired channel impeller, the impeller was shattered, and inhalation of air pipes to a mixture, shuaixiang scroll to the rotation direction of flow. And then right to water in the backwater hole converging flow along the spiral flow. Due to the constant impact of the liquid in the case of the blade cascade, and constantly being crushed by the impeller, with the strong mixing of the air, the formation of a mixture of water and gas, and constantly flow so that the gas can not be separated from the water. The mixture was separated at the volute tongue export stripping along the short tube into the separation chamber. Isolated in the separation of indoor air discharged by an outlet pipe, and the water still flow by about backwater hole to the outer edge of the impeller, and mixed with the air suction pipe.