Journal of Shanghai Jiao Tong University

Journal of Shanghai Jiaotong University >

2021 , Vol. 55 >Issue 7: 826 - 833

DOI: https://doi.org/10.16183/j.cnki.jsjtu.2020.279

Microfluidic Inertial Switch Capable of Bidirectional Anti-High Overload

Expand
  • School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China

Received date: 2020-09-08

  Online published: 2021-07-30

Fold

Abstract

In order to realize the stable application of microfluidic inertial switch in the intelligent ammunition fuze system, a bidirectional anti-high overload microfluidic inertial switch is proposed to solve the problem of switch contact instability caused by the mercury droplet separation under high impact. The structures of snake-shaped buffer channel and three-stage capillary valve are designed based on the principle of capillary force applied to the mercury droplet in microchannel. The force state of the mercury droplets in the contraction type and the expansion type of capillary valves is analyzed. The static threshold model of the mercury droplet in the rectangular channel is established. The user defined function (UDF) is used to apply acceleration load to the finite element simulation of the switch. The simulation analysis suggests that under the action of typical forward service drop load and typical reverse service drop load, the mercury droplets can be restored to its initial state without droplet separation, indicating that the switch has a reliable anti-high overload ability. Two centrifugal experiments are conducted to complete the preparation and injection of tiny mercury droplets. The microfluidic switch prototype is used in the impact test of the Machete drop hammer. The results show that the mercury droplet separation does not occur in the switch under the action of typical forward impact load and typical reverse impact load, which are consistent with the simulation results.

Key words： microfluidic inertial switch; micro-acceleration switch; capillary force; anti-high overload

Cite this article

ZHANG Runduo, NIE Weirong, QIU Weixiang . Microfluidic Inertial Switch Capable of Bidirectional Anti-High Overload[J]. Journal of Shanghai Jiaotong University, 2021 , 55(7) : 826 -833 . DOI: 10.16183/j.cnki.jsjtu.2020.279

References

[1] 范晨阳, 刘剑霏, 田中旺. 基于动电极翻转的MEMS万向惯性开关[J]. 探测与控制学报, 2019, 41(3): 76-80.
[1] FAN Chenyang, LIU Jianfei, TIAN Zhongwang. MEMS omnidirectional inertial switch based on moving electrodeove overturning[J]. Journal of Detection & Control, 2019, 41(3): 76-80.
[2] 孔南, 席占稳, 聂伟荣, 等. 可识别载荷方位区间的MEMS万向惯性开关[J]. 探测与控制学报, 2017, 39(2): 13-18.
[2] KONG Nan, XI Zhanwen, NIE Weirong, et al. MEMS omni-directional inertial switch with load azimuth interval identify[J]. Journal of Detection & Control, 2017, 39(2): 13-18.
[3] LI J, WANG Y, LI Y, et al. A contact-enhanced MEMS inertial switch with electrostatic force assistance and multi-step pulling action for prolonging contact time[J]. Microsystem Technologies, 2018, 24(7): 3179-3191.
[4] 黄刘, 聂伟荣, 王晓锋, 等. 抗高过载微流体惯性开关[J]. 光学精密工程, 2016, 24(3): 526-532.
[4] HUANG Liu, NIE Weirong, WANG Xiaofeng, et al. A microfluidic inertial switch with response characteristics to high acceleration[J]. Optics and Precision Engineering, 2016, 24(3): 526-532.
[5] LI J J, NIE W R, LIU G W. Microfluidic inertial switch based on J-shape communicating vessels[J]. Microsystem Technologies, 2019, 25(3): 917-923.
[6] SHEN T, LI J J, HUANG L, et al. Dynamic flow characteristics in U-type anti-high overload microfluidic inertial switch[J]. Microfluidics and Nanofluidics, 2019, 23(3): 1-14.
[7] SHEN T, ZHANG D X, HUANG L, et al. An automatic-recovery inertial switch based on a gallium-indium metal droplet[J]. Journal of Micromechanics and Microengineering, 2016, 26(11): 115016.
[8] XU H Y, ZHAO Y L, ZHANG K, et al. A capacitive MEMS inclinometer sensor with wide dynamic range and improved sensitivity[J]. Sensors, 2020, 20(13): 3711.
[9] NIE W R, LIU G W, ZHANG R D. Microfluidic inertial switch with delay response characteristics[J]. Journal of Physics: Conference Series, 2020, 1507:102001.
[10] 李嘉杰, 聂伟荣, 刘国伟. 高阈值长脉宽响应的微流体惯性开关[J]. 光学精密工程, 2019, 27(1): 101-109.
[10] LI Jiajie, NIE Weirong, LIU Guowei. Microfluidic inertial switch with high threshold and long pulse-width response[J]. Optics and Precision Engineering, 2019, 27(1): 101-109.
[11] HUANG L, NIE W R, WANG X F, et al. Feature coefficient prediction of micro-channel based on artificial neural network[J]. Microsystem Technologies, 2017, 23(6): 2297-2305.
[12] SHEN T, HUANG L, WANG J. Analysis and experiment of transient filling flow into a rectangular microchannel on a rotating disk[J]. Microfluidics and Nanofluidics, 2016, 20(4): 1-12.
[13] 张伟锋. 石英MEMS传感器湿法刻蚀工艺及设备制造技术研究[J]. 电子工业专用设备, 2020, 49(2): 29-33.
[13] ZHANG Weifeng. Research on wet etching process and equipment manufacturing technology of quartz MEMS sensor[J]. Equipment for Electronic Products Manufacturing, 2020, 49(2): 29-33.
[14] EHIASARIAN A P. High-power impulse magnetron sputtering and its applications[J]. Pure and Applied Chemistry, 2010, 82(6): 1247-1258.
Options
Outlines

/

〈 〉