负压驱动蠕动微型泵的研究进展  

Research Progress of a Peristaltic Micropump Driven by Pneumatic Pressure

作　　者：崔建国[1] 

机构地区：[1]重庆理工大学,重庆400054

出　　处：《流体机械》2013年第9期33-36,86,共5页Fluid Machinery

基　　金：重庆市自然科学基金项目(cstc2011jjA10018)

摘　　要：基于负压驱动原理研制了一种结构简单的蠕动微型泵。微型泵由3层聚二甲基硅氧烷(PDMS)材料,构成气路层、驱动薄膜层和流路层,其全部结构均采用激光器加工制作而成,并通过表面等离子体氧化处理技术实现了各PDMS层之间的键合封装。该微型泵具有流速高、回流低、气泡耐受能力强,以及不伤害传送介质的特点。尤为重要的是,连接负压源的气路层通过PDMS薄膜能有效去除流路中的气泡,这是处理复杂流体样品时所期望的。通过对比前期微型泵的气路通道的流阻、常闭微阀的个数、负压压力和驱动频率等各项参数,获得了其性能参数。在50kPa负压和30Hz驱动频率的条件下,获得的最佳流速为600μL/min,这一流速参数可与正压气动型蠕动泵的流动性能相媲美。Based on vacuum-driven principle, a simple peristaltic micmpump is developed. The micropump fabricated by laser micmmachining and plasma bonding of three polydimethylsiloxane （PDMS） layers, includes a pneumatic channel layer, actuation membrane layer, and microfluidic channel layer. The vacuum-driven peristaltic micropump offers high pumping rates, low back- flow, appreciable tolerance to air bubbles, and minimal destruction to fluid contents. In addition, the pneumatic network with negative pressure provides a means to effectively remove air bubbles present in the microflow through the gas-permeable PDMS membrane, which can be highly desired in handling complex fluidic samples. Experimental characterization of the previous mi- cropump performance has been conducted by controlling the resistance of the pneumatic network, the number of normally closed valves, the vacuum pressure, and the frequency of pressure pulses. A maximal flow rate of 600μL/min has been optimized at the pulsed vacuum frequency of 30 Hz with a vacuum pressure of 50 kPa, which is comparable to that of compressed air-actuated peristaltic micropump.

关 键 词：微型泵 微流体 负压驱动 蠕动 

分 类 号：TH137.51[机械工程—机械制造及自动化] TP271[自动化与计算机技术—检测技术与自动化装置]