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HOW TO CHOOSE SCREW PUMP?

date:2020-04-01 reading volume:361
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Screw pump overview, screw pump is a positive displacement rotor pump, it is by the screw and bushing formed by the volume of changes in the volume of the sealed chamber to draw in and out of the liquid.

HOW TO CHOOSE SCREW PUMP? Screw pump overview, screw pump is a positive displacement rotor pump, it is by the screw and bushing formed by the volume of changes in the volume of the sealed chamber to draw in and out of the liquid. Screw pump according to the number of screw is divided into single screw pump, double, three and five screw pump. The screw pump is characterized by steady flow, small pressure fluctuation, self-priming ability, low noise, high efficiency, long service life and reliable operation, transportable high viscosity medium. 1, to transport medium viscosity and pump specifications to determine the speed range: heat exchanger manufacturers, transport high viscosity medium, the pump should choose low speed, if the viscosity is low, the corresponding choice of high speed: medium viscosity 20E, for large-size pumps (main rod diameter above 60mm) , the speed is 970rpm or 720RPM, if the viscosity is higher (viscosity 80E) such as mucilage, can reduce the speed of use, recommended 200-500rpm; for small-size pumps, medium viscosity 20E, the speed of rotation is 1450rpm or 970RPM, appropriate, if the viscosity is higher (viscosity 80E) , can be used to reduce the speed, recommended 300-600rpm. 2, because the pump speed is higher, under the same performance parameter, the pump's volume is smaller, but because the speed is high, the friction power is high, the pump's wear is big, the service life is short, if the transportation medium's lubricity is poor or contains the trace impurity, lower RPM should be selected to maintain a longer pump life, recommended at 1450rpm. 3, the structure of the selection can be based on the installation and use of pump conditions reference three screw pump series and type to carry out, in principle: transport lubricating oil, temperature in 80 °c below the selection of built-in bearing structure of the pump. 4, the temperature of more than 80 °C or poor lubrication transmission medium, the choice of external bearing structure of the pump. 5, Transport Mobility, high viscosity of the medium or need to transport the medium for heating or insulation to choose double-layer heating pump body structure. 6, high-temperature transport, should choose high-temperature materials made of the pump.



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