Molten salt pumps, vacuum pumps, submerged pumps, metering pumps, gear pumps, corrosion-resistant pumps, acid resistant pumps, and fire pumps flow in the direction of rotation. Then it converges with the water flowing from the right return hole and flows along the snail shell. Due to the continuous impact of liquid on the blade cascade inside the volute, it is constantly crushed by the impeller, and then strongly stirred and mixed with air to generate a gas-water mixture, which continuously flows and prevents the separation of gas and water. The mixture is tongue separated at the outlet of the snail shell and enters the separation chamber along a short tube. The air inside the separation chamber is separated and discharged through the outlet pipe, while the water still flows towards the outer edge of the impeller through the left and right return holes and mixes with the air in the suction pipe. This repeated cycle gradually exhausts the air in the suction pipeline, allowing water to enter the pump and complete the self suction process. The sewage pump, self suction pump, diaphragm pump, screw pump, gear pump, and pump are the same, with the only difference being that the return water does not flow to the outer edge of the impeller, but to the inlet of the impeller. When starting an internal mixing self-priming pump, the reflux valve below the front of the impeller must be opened to allow the liquid inside the pump to flow back to the inlet of the impeller. Under the high-speed rotation of the impeller, water mixes with the air from the suction pipe, forming a gas-water mixture that is discharged into the separation chamber. Here, air is discharged while water returns from the reflux valve to the inlet of the impeller. Repeat this process with the self priming pump until all the air is discharged and water is drawn in. The working principle of the internal mixing self priming pump is the same as that of the external mixing self priming pump.