If the improper selection of the three screw pump, not only can not get satisfactory operation results, but also lead to the pump noise and vibration, and even serious damage to the pump's internal parts, so that the pump system can not work properly, therefore, the selection should be carefully considered , A reasonable selection. Three screw pump selection, to be as detailed as possible to understand the conditions of the pump, in addition to the operating parameters, such as flow, pressure needs to be clear, the characteristics of the transmission medium such as media corrosivity, gas content, solid solution containing the ratio And the size of the solid particles, as well as medium temperature, viscosity, specific gravity, corrosive materials such as pumping equipment and suction conditions, to understand the installation conditions. According to experience, the selection of three screw pump should pay attention to the following points: First, the choice of three screw speed 1. To determine the transmission medium viscosity and pump speed range: High viscosity medium, the pump should be selected low speed, if Low viscosity with a correspondingly high speed: Medium viscosity> 20 ° E, for large size pumps (main bar OD 60 mm and over), speed at 970 rpm or 720 rpm, higher viscosity (viscosity> 80 ° E ) For viscosities, reduce the speed to use, recommended 200-500rpm; for small size pumps, media speeds> 14 ° or 970rpm for media viscosity> 20 ° E, higher viscosities (> 80 ° E) Can reduce the speed of use, recommended 300-600rpm; 2. As the pump speed is higher, the same performance parameters, the smaller the pump size, but because of high speed, high friction power, pump wear large, short life expectancy If the lubrication medium is poor or contains traces of impurities, you should choose a lower speed, so that the pump to maintain a longer life, recommended below 1450rpm. Second, the choice of three screw pump structure can be based on the installation and use of the pump reference three screw pump series and type to carry out, in principle: 1. Transport lubricated oil, the temperature below 80 ° C choose the built-in bearing structure of the pump ; 2. When the temperature exceeds 80 ° C or the transmission medium lubrication is poor, choose the external bearing structure of the pump; 3. Transport poor mobility, high viscosity medium or the need for the medium to be heated or heat insulation double-heating pump Structure of the pump; 4. High temperature transport, should choose the pump made of high temperature materials, please contact our factory. Three and three screw pump matching motor selection Three screw pump selection is determined, according to the sample data can be found in the pump shaft power N, the shaft power coupled with a certain power reserve, as a basis for matching the motor, General motor power Nm should not be less than the pump shaft power N multiplied by the power reserve coefficient K value obtained, K value can refer to the table below: N (KW) N50 K 1.25 1.2 1.15 1.1 election three screw pump is often also provided by the sample Of the pump performance parameters are given in tabular form or specific viscosity, speed performance curve is given in the form of the required performance of the pump sometimes can not be read directly, then follow the following principles for a rough estimate: Three screw pump flow, pressure In the same speed, viscosity is approximately linear relationship, the higher the pressure, the smaller the flow. The same viscosity, pressure, pump flow and speed is approximately proportional to. 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. As long as the three screw pump properly selected, maintenance is reasonable, you can get satisfactory operating results.
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