Theoretical Analysis on Flow Characteristics of Melt Gear Pump

Due to these problems such as poor flow quality,large radial force,which makes applications of requiring high quality flow characteristics unsuitable such as melt extrusion. A new type of melt gear pump,four idler wheel melt gear pump,was designed. To analysis the flow characteristics. The strict mathematic analysis and the simulation by MTALBA software were conducted. The law of the meshing moment and the stack movement were deeply studied,and the corresponding uniformity of the flow in melt gear pump of four different gear numbers through mathematic deduction was analyzed. The corresponding regulations of four gear numbers about coefficient of flow rate pulsation were simulated with MATLAB software. The result shows: if the number of the gear is 4k( Z1= 4k),its coefficient and frequency of flow rate pulsation are similar with general external gear pump; when the number of the gear is 4k + 1 or 4k + 3,their flow characteristics are very closed,and their coefficient of flow rate pulsation achieve obviously improved,and their frequency is 8 times than the general external gear pump's; when the number of the gear is 4k + 2,its coefficient of flow rate pulsation achieve obviously improved,and their frequency is 4 times than the general external gear pump's.