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Three screw pump selection should pay attention to the following aspects: First, the choice of three screw speed 1, the transmission medium viscosity and pump size to determine the speed range: When conveying high viscosity medium, the pump should be selected low speed, if the viscosity Low, the corresponding choice of high-speed; medium viscosity> 20 ° E, for large-size three-screw pump (the main rod diameter of 60mm and above), the speed of 970rpm or 720rpm appropriate, if the viscosity is higher (viscosity> 80 ° E ) For viscous fluids, the speed is reduced to 200-500 rpm. For small three-screw pumps, the medium speed is 1450 rpm or 970 rpm for medium viscosity> 20 ° E. If the viscosity is higher (viscosity> 80 ° E ), Can reduce the speed of use, recommended 300-600rpm; 2, due to the higher pump speed, the same performance parameters, the smaller the pump size, but because of high speed, high friction power, pump wear, life Short, if the transmission medium lubrication is relatively poor or contains trace impurities, should choose a lower speed, so that the pump to maintain a longer life, recommended below 1450rpm. Second, the choice of structure can be based on the installation and use of the pump reference three screw pump series and type to be carried out, in principle: 1, conveying lubricated oil, the temperature below 80 ° C select the built-in bearing structure of the pump; 2 , The temperature exceeds 80 ° C or the transmission medium lubrication is poor, select the external bearing structure of the pump; 3, the transmission of poor mobility, high viscosity medium or the need for the medium to be heated or heat insulation double- Pump; 4, high temperature transport, should choose the pump made of high temperature materials, please contact with our factory. Third, matching motor matching pump selection is determined, according to the sample data can be found three screw pump shaft power N, the shaft power coupled with a certain power reserve, as a basis for matching the motor, the general motor The power Nm should be not less than the value obtained by multiplying the pump shaft power N by the power reserve coefficient K, and the value of K can be taken as the following table: N (KW) KK 1.25 1.2 1.15 1.1 Flow rate and pressure of the three screw pump at the same speed and viscosity Approximately a linear relationship, the higher the pressure, the smaller the flow. The same viscosity, pressure, three screw pump flow and speed is approximately proportional. The same speed, viscosity, shaft power and pressure is approximately proportional. The same viscosity, pressure, shaft power and speed is approximately proportional. As the viscosity increases, both flow and shaft power increase, but because of the complex relationship between them, consult a specialist if necessary. In short, as long as the proper selection, maintenance and reasonable, three screw pump can ensure satisfactory operation.
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