TaiBang 3GR three screw up consideration from the selection of the main performance parameters
The infusion of three screw body for a variety of solid particles, lubricating oils and similar non-corrosive liquid oil , the viscosity of infusion 1.2-100E (3.0-760cst), high-viscosity liquids can also drop by warming after conveying sticky .
Flow range 0.2-590m / h, maximum working pressure of 100bar, the maximum temperature of 150 ℃
Although 3GR three screw has many advantages, but if improper selection, then not only not satisfactory operating results , and can cause noise and vibration of the pump, or even serious damage to the internal parts of the pump so that the pump system is not working properly , so , the multi- selection should be carefully considered , rational selection, if necessary, should the technical personnel.
When three 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 to clearly outside the transport properties of the medium , such as corrosive media , including steam , with the ratio of solid solution and the size of the solid particles and the medium temperature , viscosity, specific gravity, and other corrosive materials, and the pump suction means conditions have to understand the installation conditions .
Similar to the single screw and twin-screw pump , three screw up consideration of choices from the main performance parameters .
Pump speed selection is mainly based on the transmission medium viscosity and specifications to determine its scope.
Transmission of high viscosity media , the pump should be selected low speed , if the viscosity is low , the corresponding optional high speed: Medium viscosity > when 20 ° E, the large size of the pump ( the main bar outside diameter 60mm and above) , speed to 970rpm or 720rpm appropriate, if a higher viscosity ( viscosity > 80 ° E) as viscose , can reduce the speed using the recommended 200-500rpm; when the pump , medium viscosity small size > 20 ° E, speed 970rpm to 1450rpm or appropriate If a higher viscosity (viscosity > 80 ° E), can reduce the speed using the recommended 300-600rpm;
Because of the higher rotational 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 is relatively poor lubrication or traces impurities should choose a lower speed in order to extend the life of the pump , it is recommended 1450rpm or less.
Select the structure can be installed and used in accordance with the conditions of three screw pumps reference to the series and type , of which there are four principles can refer to : conveying lubricating oils, temperature below 80 ℃ choose built- bearing structure of the pump ; temperature exceeds 80 ℃ transport medium or poor lubrication , the pump select the external bearing structure ; select double pumping heat pump configuration of poor fluidity , high viscosity media or the transmission medium need to be heated or thermal insulation ; high when transporting , should be selected pump made of high-temperature materials .
In addition , depending on the circumstances, considering the material combinations to the pump suction capacity , factors supporting the motor optional . As long as the proper selection , maintenance and reasonable, three screw can ensure satisfactory operation
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