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本文对热驱动微型泵在空载和有负载 (即泵送液体 )情况下的性能进行了实验研究。空载情况下 ,在所测频率范围内 ,膜片的振幅随频率减小 ,但泵腔的体积变化率随频率基本不变 ;随着加热功率的增加 ,膜片平衡位置逐渐远离其静止位置 ,当功率足够大时,膜片平衡位置的变化将减缓 ,振幅变化也将减缓。实验测定了有负载情况下泵的频率特性,对应于最大流量的频率为3Hz ;实测了流量随加热功率的变化 ,当功率较小时 ,流量缓慢变化 ,当功率较大时 ,流量迅速增大。
In this paper, the performance of a heat-driven micro-pump under no-load and load (that is, pumping liquid) has been experimentally studied. In the no-load condition, the amplitude of the diaphragm decreases with the frequency within the measured frequency range, but the volume change rate of the pump chamber is basically unchanged with the frequency. With the increase of the heating power, the diaphragm equilibrium position is gradually away from its rest position When the power is large enough, the change of the equilibrium position of the diaphragm will slow down and the amplitude change will also slow down. The frequency characteristics of the pump under load are experimentally determined. The frequency corresponding to the maximum flow rate is 3 Hz. The measured flow rate changes with the heating power. When the power is small, the flow rate changes slowly. When the power is larger, the flow rate increases rapidly.