Research On Stirring Characteristics And Key Structural Parameters Of High Viscosity Planetary Agitator

A high-viscosity planetary agitator is a device that mixes and mixes high-viscosity fluids.The paddle type of the planetary agitator plays an important role in high-viscosity agitation,and has an important influence on the agitation characteristics such as flow pattern,circulation flow rate,stirring power,mixing time,and mixing efficiency.Through the optimization and improvement of the planetary agitator paddle type,the effect of high-viscosity planetary agitation can be improved and the stirring efficiency can be improved.Therefore,in order to improve the performance of the planetary agitator,it is necessary to simulate and analyze the planetary agitators of different paddle types.This paper introduces the agitator paddle type commonly used for high-viscosity agitation,and the calculation method of agitation characteristics such as circulation flow and agitation power of different paddle types.In order to study the effect of paddle type variation on high-viscosity planetary agitation,based on the original paddle type,two other paddle types were designed as a comparison scheme for simulation analysis.Since the planetary agitator in this study is a new type of composite paddle type,there is no corresponding calculation method for agitation characteristics.Therefore,in order to obtain the stirring characteristics of the three schemes,the Fluent is used to simulate the single-blade agitation of the three-propeller type,and the data such as velocity distribution and torque are extracted from the simulation results,and the agitating characteristics of the paddle type are calculated and compared.The results show that the diameter and height of the stirring blade are constant,the larger the pitch is,the closer the paddle shape is to the frame type,the larger the radial flow effect is,the smaller the circulating flow rate is,the smaller the stirring power is;the smaller the pitch is,the closer to the ribbon type paddle type,the greater the axial flow effect,and the larger the agitation circulating flow rate,the larger the stirring power constant.The planetary agitation simulation of the three-propeller type was carried out using Fluent.From the data of the simulation results,the planetary agitation characteristics of different paddle schemes were calculated,and the mixing time of planetary agitation of different paddle schemes was determined by the tracer method,and the scheme comparison was carried out.The results show that the effect of paddle change on planetary agitation is basically consistent with that of single propeller.At the same time,the smaller the pitch,the closer the paddle type is to the spiral paddle type,and the shorter the mixing time,the higher the mixing efficiency.A mathematical model of the planetary agitation trajectory and the planetary speed ratio is established,and the relationship between the planetary speed ratio and the planetary agitation trajectory is clarified.The trajectory simulation of planetary agitation is performed using Adams.Combined with the trajectory simulation results and the planetary agitation speed ratio design principle,the original planetary speed ratio is optimized,and the Adams trajectory simulation analysis is carried out on the optimized speed ratio.By optimizing the comparison before and after,the optimized speed ratio is more uniform,the coverage area is more uniform,and the mixing effect is improved.