Centrifugal pump is a sub-class of turbomachinery technology

Centrifugal pump is a sub-class of turbomachinery technology. The main work of this type of pump is to bring up fluids through the transformation of the rotational energy into another energy called hydrodynamic energy. Typically, the rotational energy source is either the turbine, electric motor or engine.

Working principle of centrifugal pump

After the centrifugal pump started, the pump shaft drive impeller together to do high speed rotation, forced beforehand filling between the blades liquid rotation, under the function of inertia centrifugal, liquid does a radial motion from the impeller center to peripheral. Liquid won energy in the process of flow to impeller movement, static pressure energy increases, velocity increased. After liquid depart from impeller to enter into pump casing, because the crust port gradually expands and deceleration, part of kinetic energy changes to static pressure energy, along the tangential inflow discharge piping. So the pump volute shell is not only gathers by impeller outflow liquid components, and also is a convert energy device. When the liquid jilt to peripheral from impeller center, at the same time, the impeller center forms low pressure area, under the action of tank liquid level and impeller center total potential, lead to liquid absorbed into the impeller center. Relying on the impeller's continuous operation, liquid continuous inhaling and exhaling. Liquid in centrifugal pump acquired during the mechanical energy final expression as static pressure increase.Need stressed is, if before centrifugal pump start-up, do not fill conveyed liquid in pump shell, as the low air density, the centrifugal is small formed after impeller rotation, impeller central area is not enough to form inhaled tank liquid low pressure, so although start centrifugal pump also can not convey liquids. This suggests that centrifugal pump has no self-priming, this phenomenon is called ability gas tied. Suction piping installing one-way bottom valve is to prevent before start, initiating into the pump housing liquid from casing to outflow. Air from suction piping into pump casing will also cause gas tied.

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