Centrifugal pump is a kind of pump that USES the centrifugal action generated when the PR wheel rotates at high speed to change the mechanical energy into the kinetic energy and the pressure energy of water to raise water. It is divided by the number of impeller into a single stage pump (only one impeller) and multistage pump (more than two impeller) : according to the impeller inlet way and divided into single suction pump and double suction pump: single suction pump is a single eagle impeller inlet. Its head height, simple structure, reliable work, but the meteor is small, suitable for mobile drainage and irrigation; The double-suction centrifugal pump takes water from the two sides of the impeller with a flow twice as much as the single-suction pump, but its structure is complex, so it is suitable for the fixed farm drainage station with large flow and high head. Ordinary centrifugal pump needs to discharge the air in the pump shell and inlet pipe before working. For small pump, it is necessary to fill the chestnut shell and inlet pipe with water. For large mercury pump, it is necessary to have special auxiliary equipment to pump air and divert water. Another form of centrifugal pump is self-priming centrifugal pump. At present, there are three kinds of pumps used in agriculture irrigation: single-stage single-suction centrifugal pump, single-stage double-suction centrifugal pump and small-sized self-suction centrifugal pump.
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