基于层叠式流道结构多喷嘴电喷头的供液性能研究

Research on liquid supply performance of multinozzle electrospray head based on stacked flow channel structure

在奇数多喷嘴电流体动力喷印系统中,针对流量泵供液时喷嘴阵列获得的流量不均匀影响打印质量的问题,提出在喷头内设置一种层叠式微流道辅助分流的解决办法。基于以上层叠式微流道,系统研究了导流单元几何形状、结构参数和流道并联排布形式对其分流效果的影响规律。结果表明:导流单元为正六边形的流道分配性能较好;增大“多孔”分形通道槽宽可提高供液均匀性;当主通道槽宽不大于0.6 mm时,流道供液均匀性随主通道槽宽增大而提高;并联总出口数为17的双层级流道供液均匀性较好。将层叠式微流道分流结构和实际喷头进行集成,验证了在喷印系统实际施加电场的工况条件下,流道依然能保持很好的供液均匀性,且出口最大不均匀度在6%以内。

In an odd-numbered multi-nozzle electrohydrodynamic jet printing system,aiming at the problem that the non-uniform flow obtained by the nozzle array when the flow pump is supplying liquid affects the printing quality,a solution is proposed to set up a stacked micro-channel in the nozzle to assist in the shunting.Based on the above-mentioned stacked microchannels,the influence rule of the geometry,structural parameters and parallel arrangement of the flow channels on the diversion effect of the diversion unit is systematically studied.The results show that the distribution performance of the flow channel with the regular hexagonal diversion unit is better;increasing the groove width of the"porous"fractal channel can improve the uniformity of liquid supply;when the groove width of the main channel is not more than 0.6 mm,uniformity of liquid supply in the flow channel increases with the increase of the width of the main channel;the uniformity of liquid supply in the double-stage flow channel with the total number of 17 parallel outlets is better.Further,the stacked micro-channel shunt structure is integrated with the actual nozzle,and it is verified that under the conditions of the actual applied electric field of the printing system,the channel can still maintain a good uniformity of liquid supply and the maximum non-uniformity of the outlet is within 6%.