TaiBang 3GR three screw pump selection should note the following
TaiBang 3GR three screw pump selection should note the following
When screw pump selection, pump as much as possible to make a detailed understanding of the conditions of use , in addition to operating parameters such as flow, pressure needs than clear, the transmission medium characteristics such as corrosive media , including steam , with the ratio of solid solution and size of the solid particles and the medium temperature , viscosity , specific gravity, suction conditions of corrosive materials , etc. , and the pump device , installation conditions have to understand , based on our experience, three screw pump selection should note the following :
Speed Selection
1 to specification transport medium viscosity and pump speed range is determined :
Transmission of high viscosity media , the pump should be selected low speed , if the viscosity is low , the corresponding optional high speed:
1 ) when the medium viscosity > 20 ° E, the large size of the three screw ( 60mm outer diameter than the main bar ) , speed to 970rpm or 720rpm appropriate, if a higher viscosity ( viscosity > 80 ° E) as viscose , use can reduce the speed recommended 200-500rpm;
2 ) For the small size of the three screw pump, the medium viscosity > 20 ° E, speed 970rpm to 1450rpm or appropriate, if a higher viscosity ( viscosity > 80 ° E), can reduce the speed using the recommended 300-600rpm;
2, the higher the speed of the pump , in the same performance parameters, the smaller the volume of the pump , but because of high speed, high power friction , wear of the pump is large, the life is short, if the transmission medium or poor lubrication containing trace impurities should choose a lower speed in order to extend the life of the pump , it is recommended 1450rpm or less.
Select structure
1 , conveyor lubrication oils at temperatures below 80 ° C to select the built- bearing structure of the pump ;
2, the temperature exceeds 80 ° C or transport medium lubrication is poor, select the external pump bearing structure ;
Select double- pump 3 heating pump structure , transportation , poor mobility, high viscosity media or require the transmission medium heat or thermal insulation ;
4, the high-temperature transport , you should choose a pump made of high-temperature materials , please contact our factory .
Optional matching motor
After the pump selection is determined , based on the sample data can be found in three screw shaft power N, the shaft power plus a power reserve after the motor as an option based on the general power Nm motor shaft power should not be less than N multiplied by the value of the power reserve coefficient K, the value of K values can refer to the following table:
Three screw pump flow, pressure at the same speed, the viscosity of approximately linear relationship , the higher the pressure, the flow is smaller.
N (KW) ≤ 5 5 × N ≤ 10 10 N> 50
Nm (kw) ≥ 1.25 × N ≥ 1.2 × N ≥ 1.15 × N ≥ 1.1 × N
Under the same viscosity , pressure, flow and speed of three screw approximately proportional .
Same speed, viscosity , and pressure is approximately proportional to shaft power .
The same viscosity, under pressure , shaft power and speed is approximately proportional .
When the viscosity increases , flow and shaft power are increased, but the relationship is more complex because of which , if necessary, to the professional advice.
In short, as long as the proper selection , maintenance and reasonable, three screw can ensure satisfactory operation.
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