![<?echo $_SERVER['SERVER_NAME'];?>](/template/twentyseventeen/skin/images/header.jpg)
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 the medium temperature, viscosity, specific gravity, corrosive materials such as pumping equipment and suction conditions, installation conditions should be understood, according to our experience, three screw pump selection should pay attention to the following point:
1, the choice of three screw speed 1.1, the viscosity of the media and pump to determine the size of the speed range:
When the viscosity of medium is higher than 20 ° E, for the large-size three-screw pump (the outer diameter of the main rod is more than 60mm), the rotating speed should be 970rpm Or 720rpm is appropriate, if the viscosity is higher (viscosity> 80 ° E), such as viscose, can reduce the speed of use, recommended 200-500rpm;
For small-size three-screw pumps, the speed of rotation is 1450 rpm or 970 rpm for medium viscosities> 20 ° E and 300-600 rpm for higher viscosities (> 80 ° E)
1.2, due to the pump speed is higher, the same performance parameters, the smaller the pump size, but because of high speed, high friction power, the pump wear large, short life expectancy, if the lubrication of the transmission medium is poor or Containing trace impurities, should choose a lower speed, so that the pump to maintain a longer life, recommended below 1450rpm.
2, the choice of structure according to the installation and use of the pump reference three screw pump series and type to, in principle:
2.1, conveying lubricated oil, the temperature below 80 ° C select the built-in bearing structure of the pump;
2.2, the temperature exceeds 80 ° C or the transmission medium lubrication is poor, select the external bearing structure of the pump;
2.3, conveying poor mobility, high viscosity medium or the need to transport the medium for heating or insulation, select double-layer structure of the pump heat pump;
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 of three screw pump flow, pressure in the same speed, viscosity is approximately linear relationship, the higher the pressure, the smaller the flow.
1, the choice of three screw speed 1.1, the viscosity of the media and pump to determine the size of the speed range:
When the viscosity of medium is higher than 20 ° E, for the large-size three-screw pump (the outer diameter of the main rod is more than 60mm), the rotating speed should be 970rpm Or 720rpm is appropriate, if the viscosity is higher (viscosity> 80 ° E), such as viscose, can reduce the speed of use, recommended 200-500rpm;
For small-size three-screw pumps, the speed of rotation is 1450 rpm or 970 rpm for medium viscosities> 20 ° E and 300-600 rpm for higher viscosities (> 80 ° E)
1.2, due to the pump speed is higher, the same performance parameters, the smaller the pump size, but because of high speed, high friction power, the pump wear large, short life expectancy, if the lubrication of the transmission medium is poor or Containing trace impurities, should choose a lower speed, so that the pump to maintain a longer life, recommended below 1450rpm.
2, the choice of structure according to the installation and use of the pump reference three screw pump series and type to, in principle:
2.1, conveying lubricated oil, the temperature below 80 ° C select the built-in bearing structure of the pump;
2.2, the temperature exceeds 80 ° C or the transmission medium lubrication is poor, select the external bearing structure of the pump;
2.3, conveying poor mobility, high viscosity medium or the need to transport the medium for heating or insulation, select double-layer structure of the pump heat pump;
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 of three screw pump flow, pressure in the same speed, viscosity is approximately linear relationship, the higher the pressure, the smaller the flow.