The self-priming pump is a self-priming centrifugal pump, which has the advantages of compact structure, convenient operation, stable operation, easy maintenance, high efficiency, long service life and strong self-priming capability. The pipeline does not need to be installed with a bottom valve. It is only necessary to ensure that the pump body has a quantitative liquid before the work. Different materials can be self-priming pumps of different materials.
The working principle of the self-priming pump is to fill the pump casing with water before the pump starts (or the pump itself contains water). After the start, the impeller rotates at a high speed to make the water in the impeller channel flow toward the volute. At this time, the inlet forms a vacuum, so that the inlet water stops the door, and the air in the suction pipe enters the pump and reaches the outer edge through the impeller channel.
Self-priming pumps have many types of structures, including molten salts.
Pumps, vacuum pumps, submerged pumps, metering pumps, gear pumps, corrosion-resistant pumps, acid-resistant pumps, and fire pumps flow in the direction of rotation. It then merges with the water flowing from the right return hole and flows along the volute. As the liquid continuously hits the cascade in the volute and is continuously crushed by the impeller, it is stirred and mixed with the air to form a gas-water mixture, and continuously flows so that the gas and water cannot be separated. The mixture is peeled off at the outlet of the volute by a tongue and enters the separation chamber along the short tube. In the separation chamber, the air is separated and discharged by the outlet pipe, and the water still flows to the outer edge of the impeller through the left and right return holes, and is mixed with the air of the suction pipe. This cycle is repeated, gradually draining the air in the suction line, allowing water to enter the pump and completing the self-priming process. The sewage pump self-priming pump oil pump diaphragm pump screw pump gear oil pump is the same, the difference is that the return water does not flow to the outer edge of the impeller, but flows to the impeller inlet. When the internal mixing self-priming pump is started, the return valve in front of the impeller must be opened to allow the liquid in the pump to flow back to the impeller inlet. The water is mixed with the air from the suction pipe by the high-speed rotation of the impeller, and the gas-water mixture is discharged to the separation chamber. Here the air is discharged and the water is returned from the return valve to the impeller inlet. This is repeated until the air is exhausted, and the water is sucked into the internal self-priming pump, and the working principle is self-priming.