A general-purpose fast micro-mixer based on surface-curing 3D printing

Abstract

The invention relates to a universal fast micro-mixer based on surface solidification 3D printing, which includes a housing in which a liquid inlet module, a straight microchannel module, a double helix microchannel module and a mixed liquid outlet module are integrated; the liquid inlet module includes at least Two inlets are used to input liquids of different concentrations; the inlet and outlet of the straight microchannel module are respectively connected to the outlet of the liquid inlet module and the inlet of the double helix microchannel module, and the outlet of the double helix microchannel module is connected to the outlet of the mixed liquid outlet module. The inlet connection; the straight microchannel module has a straight microchannel cavity, and a number of first obstacles are distributed in it; the double helix microchannel module includes an inflow helical section and an outflow helical section, and each helical section has a number of second obstacles distributed inside The expansion and contraction channels are composed of multiple cross-sectional areas of the expansion and contraction channels that change periodically. The invention increases the contact area and mixing length of liquids with different concentrations, and has good mixing effects for fluids with different Reynolds numbers.

Description

technical field [0001] The invention relates to the technical field of microfluidics, in particular to a general fast micromixer based on surface curing 3D printing. Background technique [0002] Microfluidics plays an increasingly important role in biochips and labs on a chip. When two or more fluids undergo chemical reactions, the effective mixing of fluids needs to be solved. Therefore, micromixers are important in microfluidic systems. component. Due to the small size of the flow channel structure of the micro-mixer, usually in the micron level, plus the Reynolds number of the fluid (Reynolds number, which is the ratio between the inertial force and the viscous force when the fluid flows, which is usually used to determine the fluid flow state) Standard, when the Reynolds number is larger, the dominant effect of the inertial force in the fluid is greater, and when the Reynolds number is smaller, the dominant effect of the viscous force in the fluid is greater) is very s...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, most of the micro-mixers can achieve the mixing purpose within a single Reynolds number range. For example, the straight channel has a better mixing effect at a low Reynolds number state, and the spiral flow has a better mixing effect at a high Reynolds number state. This makes Micromixers have limited versatility

Moreover, for a single microfluidic channel structure, such as a straight channel, the mixing process is relatively slow, and external power supply is required to overcome the huge loss of system pressure, resulting in the weakening or even disappearing of the advantages of fast microfluidic analysis.

[0004] With the rapid development of 3D printing technology, the printing accuracy is getting higher and higher, especially based on surface curing 3D printing, the processing format is large, and the accuracy can reach 5 microns. The processing of flow channel structure with multi-layer complex cross-section is helpful to realize the fine design of micro-channel size structure. At present, there is still a lack of related products to meet the rapid mixing performance of fluids at the micro-scale

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