An Active-Passive Combined Piezoelectric Gas Micromixer

Abstract

The invention belongs to the technical field of microfluid mixing, and in particular relates to an active-passive combined piezoelectric gas micromixer. The upper plate, the upper middle plate, the lower middle plate and the lower plate are connected sequentially from top to bottom; an upper baffle is installed between the upper plate and the upper middle plate; an inlet cavity is arranged between the upper plate and the upper baffle; the upper baffle A cylindrical wall is concentrically arranged on the lower end surface of the lower end; a piezoelectric vibrator is arranged between the upper middle plate and the lower middle plate; a mixing inner cavity and a mixing outer cavity are set between the piezoelectric vibrator, the cylindrical wall and the upper baffle; the mixing inner cavity is placed There are many small balls; a lower baffle is installed between the lower middle plate and the lower plate; an intermediate cavity is arranged between the lower middle plate and the lower baffle; an outlet cavity is formed between the lower plate and the lower baffle; the end faces of the upper plate are respectively A first air inlet and a second air inlet are provided; six through holes are evenly distributed on the upper baffle, the cylindrical wall, the metal base plate and the lower baffle; an air outlet is arranged at the center of the lower board. Features and advantages: high mixing efficiency and mixing intensity, simple structure and easy integration.

Description

technical field [0001] The invention belongs to the technical field of microfluid mixing, and in particular relates to an active-passive combined piezoelectric gas micromixer. Background technique [0002] In the field of microfluidics, micromixers are widely used in the fields of chemistry, biology and new energy. At present, micro-mixers can be divided into passive micro-mixers and active micro-mixers according to the presence or absence of driving components. Passive micro-mixers usually adopt a complex channel structure to increase the fluid contact area as much as possible to improve mixing efficiency. The disadvantages are complex structure, poor mixing effect and controllability. Active micro-mixers need external driving components to drive and mix, mainly including: micro-stirring, pressure disturbance, acoustic disturbance, magnetic drive, electrofluid drive, etc. Its advantages lie in good mixing effect and controllable mixing process, but there will also be proce...

AI Technical Summary

Problems solved by technology

However, the existing piezoelectric micro-mixer mainly uses the piezoelectric vibrator to directly disturb the liquid. Due to the small amplitude of the piezoelectric vibrator itself, the existing piezoelectric micro-mixer still has the problem of poor mixing intensity.

Images