centrifugal pump1. The working principle of centrifugal pumpBefore the pump starts, the pump and the inlet pipe are filled with water, after the pump is running, under the action of centrifugal force generated by the high-speed rotation of the impeller, the water in the impeller flow channel is thrown around, pressed into the volute, the impeller inlet forms a vacuum, and the water of the pool is sucked in along the suction pipe under the external atmospheric pressure to supplement this space. The water sucked in is then thrown out of the impeller through the volute and enters the outlet pipe. It can be seen that if the centrifugal pump impeller rotates continuously, it can continuously absorb and press water, and the water can continue to rise from low to high or far away. In summary, the centrifugal pump is called a centrifugal pump because the water is lifted to a high place under the action of the centrifugal force generated by the high-speed rotation of the impeller.2. General characteristics of centrifugal pumps(1) The flow direction of water along the centrifugal pump is sucked in along the axial direction of the impeller, and it flows out perpendicular to the axial direction, that is, the inlet and outlet water flow directions are 90° to each other.(2) Since the centrifugal pump forms vacuum water suction by the impeller inlet, it must be filled with water in the pump and the suction pipe before starting, or pumped with a vacuum pump to discharge air to form a vacuum, and the pump casing and suction pipeline must be strictly sealed and must not leak, otherwise it cannot be formed into a vacuum, and it will not be able to suck water.(3) Since the impeller inlet cannot form an absolute vacuum, the suction height of the centrifugal pump cannot exceed 10 meters, plus the loss along the way caused by the water flowing through the suction pipeline, the actual allowable installation height (the height of the pump axis from the suction water surface) is much less than 10 meters. If the installation is too high, it does not absorb water; In addition, because the atmospheric pressure in mountainous areas is lower than in plains, the installation height of the same pump in mountainous areas, especially in high mountainous areas, should be reduced, otherwise it cannot be sucked up.