Three screw pump (insulation three screw pump) selection, to be as detailed as possible to understand the pump conditions of use, in addition to operating parameters, such as flow, pressure needs to be clear, the transmission medium characteristics such as media corrosivity, gas content, The solid solution-containing ratio and the size of solid particles, as well as medium temperature, viscosity, specific gravity, corrosive materials such as pumping equipment and suction conditions, installation conditions are to understand, in our experience, three screw pump Type should pay attention to the following points: 1, the choice of three screw speed 1.1, the transmission medium viscosity and pump size to determine the speed range: When transporting high viscosity medium, the pump should be selected low speed, if the viscosity is low, the corresponding choice High speed: medium viscosity> 20 ° E, for large-size three-screw pump (main rod diameter 60mm and above), the speed of 970rpm or 720rpm is appropriate, if the viscosity is higher (viscosity> 80 ° E) , To reduce the speed of use, recommended 200-500rpm; for small three screw pump medium viscosity> 20 ° E, the speed of 1450rpm or 970rpm is appropriate, if the viscosity is higher (viscosity> 80 ° E), can be reduced The use of low speed, recommended 300-600rpm; 1.2, 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 large, short life, If the lubrication of the transmission medium is relatively poor or contains trace impurities, should choose a lower speed, so that the pump to maintain a longer life, recommended below 1450rpm. 2, the choice of structure can be based on the installation and use of the pump reference to the three screw pump series and type, in principle: 2.1, conveying lubricated oil, the temperature below 80 ° C select the built-in bearing structure of the pump; 2.2, The pump with external bearing structure is selected when the temperature is over 80 ° C or the lubrication of the conveying medium is poor; 2.3, the pump with poor fluidity and high viscosity or the pump with double-layer heating structure is selected when the medium to be conveyed needs heating or heat preservation ; 2.4, high temperature transport, should choose the pump made of high temperature materials, please contact our factory. 3, 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 power Nm should not be less than the pump shaft power N multiplied by the power reserve coefficient K after the value of K value can refer to the table below: N (KW) NK K1.25 1.2 1.151.1 three screw pump flow, pressure at the same speed, Viscosity approximate 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.