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面向航天器内运动部件润滑失效问题,研究设计了一种大粘度压电微喷系统。提出了环形收缩管式微喷头的加工方法,并构建了整个装置试验样机。以50%和95%高粘度的甘油水溶液为实验研究对象,对形成稳定喷射时所需的信号频率、电压、保持时间及液面高度进行了研究。研究结果表明,随着液面高度的增加最佳驱动频率减小,随着喷射溶液粘度的增大喷射所需电压增大;在保证最优保持时间的条件下,液面高度越小所需喷射电压越小,随着喷射溶液粘度的增大,能形成稳定喷射的频率带逐渐变窄。
In order to solve the problem of lubrication failure of moving parts in spacecraft, a large-viscosity piezoelectric micro-jetting system was studied. The processing method of annular shrink tube micro-nozzle is proposed, and the whole device test prototype is constructed. With 50% and 95% glycerol aqueous solution as experimental subjects, the signal frequency, voltage, holding time and liquid level required to form a stable jet were studied. The results show that the optimum driving frequency decreases with the increase of the liquid level, and the voltage required for injection increases with the increase of the viscosity of the injection solution. Under the condition of ensuring the optimal retention time, the liquid level is smaller The smaller the ejection voltage, the narrower the frequency band that can form a stable ejection as the viscosity of the ejection solution increases.