为满足微流量、小流量压电液体混合与输送方面的要求，提出了一种集流体混合与泵送为一体的半球缺群无阀泵，该泵利用半球缺的圆面与球面对流体的阻力不等，配合压电振子的往复振动实现对流体的泵送；同时，利用半球缺群对流体的遮挡、干扰效应产生的湍流和旋涡实现对流体的高效混合。在解析泵的工作原理、振子振动特性、泵理论流量基础上，进行了流量与电压、频率及行数、列数变化的半球缺群的关系试验，获得了泵系统的低频谐振频率为6Hz，并在电压及频率为160V、6Hz时，半球缺群4×3得到了53.2mL/min的泵流量，电压及频率为180V、6Hz时，半球缺群3×3得到了59.4mL/min的泵流量；对半球缺群行数、列数及间距变化对混合效果的影响进行了仿真研究和试验验证，得到了增加行数、列数及间距均能提高不同液体间混合效果的结论，试验及仿真分析的结果验证了半球缺群无阀泵能够较好地实现对流体的混合与泵送。
Abstract
In order to meet the requirements of micro flow or small flow fluid mixing and pumping, a valve-less pump with hemisphere-segment group integrated fluid mixing and conveying is proposed. In the pump the resistances that fluid flow around spherical surface and semi-circular flat surface of hemisphere-segment are unequal, and cooperating with the upward and downward vibration of piezoelectric vibrator, so the fluid is pumped in one-way. Meanwhile because the hemisphere-segments cover fluid and interfere with each other the flow field produces turbulences and vortexes, which can mix fluid with different components highly. Firstly the working principle of the pump, vibration characteristic of piezoelectric vibrator, and theoretical flow rate of pump are analyzed. Then the relationships of flow rate and voltage, vibrator frequency, different row and column number of hemisphere-segment groups are researched by experiments. And the resonance frequency of the pump system is obtained at 6Hz. With driving voltage of 160V, driving frequency of 6Hz and hemisphere-segment array group 4×3, the pump flow rate reaches to 53.2mL/min. And with driving voltage of 180V, driving frequency of 6Hz and hemisphere-segment array group 3×3, the pump flow rate reaches to 59.4mL/min.Finally the influence of difference row, column intervals and numbers of hemisphere-segment groups on fluid mixture effect is simulated and tested. The result shows that increasing row, column intervals and numbers can all improve the mixture of different fluids. The experiment and simulation verify that the valve-less pump with hemisphere-segment group can realize mixing and conveying of fluid.
关键词
压电振子 /
半球缺群 /
无阀泵 /
流体 /
混合 /
输送
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Key words
piezoelectric vibrator /
hemisphere-segment group /
valve-less pump /
fluid /
mixing /
convey
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