Novel piezoelectric valveless micromixer

Abstract

The invention discloses a novel piezoelectric valveless micromixer, which comprises a pump body and an upper matrix fixed above the pump body. A piezoelectric vibrator is fixed right above a matrix pump cavity; the pump body is provided with a pump inlet mixing unit, a pump body cavity, an outlet mixing unit and an outlet buffer cavity; a pump inlet one and a pump inlet two are communicated with the inlet mixing unit; the inlet mixing unit is communicated with the pump body cavity; the pump body cavity is communicated with the outlet mixing unit; the outlet mixing unit is communicated with an outlet buffer cavity; the outlet buffer cavity is communicated with a pump outlet; the pump body cavity is communicated with the matrix cavity; the inlet mixing unit and the outlet mixing unit are both composed of (i) n ( / i) basic mixing units, which are connected smoothly end to end; and the contour of a horizontal axis section of a single basic mixing unit comprises four logarithmic spiral lines and straight lines, wherein the four logarithmic spiral lines have a same pole shank. The mixing unit comprising logarithmic spiral lines is merged into the piezoelectric pump as a system for conveying the mixed fluid, and has low power consumption and simple structure.

Description

technical field [0001] The invention relates to the micromechanical field of microfluid pumping and mixing, in particular to a novel piezoelectric valveless micromixer. Background technique [0002] The microfluidic system can realize the separation, sample addition, mixing, reaction, detection and other functions of the traditional biochemical detection process on the chip, which not only saves reagents, but also reduces risks (such as toxic or violently reactive reagents) . As an emerging technology, microchemical engineering can be used for analysis and comprehensive applications. The microreaction systems involved in microchemical engineering mainly include micromixers, microheat exchangers, and microchannels. Among them, the micro-mixer has many defects: due to the reduction of the scale, the ratio of the fluid surface area to the volume in the micro-channel is quite large, the flow rate and Reynolds number of the liquid are low, and it is often in a state of laminar ...

AI Technical Summary

Problems solved by technology

Among them, the micro-mixer has many defects: due to the reduction of the scale, the ratio of the fluid surface area to the volume in the micro-channel is quite large, the flow rate and Reynolds number of the liquid are low, and it is often in a state of laminar flow, and the mixing is often molecular. Diffusion motion in the horizontal, making mixing of minute liquids difficult

[0003] The Chinese patent publication number is: CN 102145265 A, the application number is: 201110091097.8, and the name is: a piezoelectric microfluidic mixer, its structure is relatively complicated, and the mixing effect of the main structure telsa valve is not good, and its diffusion tube will produce Negative pressure, large flow resistance, more energy consumed during pumping

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