A Piezoelectric Micromixer Based on Synthetic Jet

Abstract

The invention discloses a piezoelectric micromixer, comprising a lower pump body fixedly connected on the right lower of the of an upper pump body, and a piezoelectric vibrator fixed on the right lower of the lower pump body, wherein the a pump outlet is arranged on the right center of the top surface of the upper pump body, the right center of the upper of the upper pump body is an upper cavity, and the right center of the lower of the upper pump body is a confluence area 1; and the right center of the upper of the lower pump body is a confluence area 2 communicated with the confluence area 1, the right center of the lower of the lower pump body is a lower cavity, the cross section of the confluence area 2 is a square, four ribs are arranged on four angles of the square, contours of the cross section of the four ribs are all composed of two parallel log spirals and a section of arc connecting both, two inlets are arranged on each side wall of the confluence 2, and two kinds of fluids respectively and alternantly enter from eight inlets, are primarily mixed by four pre-mixing passages, form a pair of vortexes in the upper cavity, and can implement continuous flux with high amount while mixed.

Description

technical field [0001] The invention relates to the micromechanical field of microfluid mixing and delivery, in particular to a piezoelectric synthetic jet 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. This not only saves reagents, but also reduces dangers (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, there are many defects in the micro-mixer: 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...

AI Technical Summary

Problems solved by technology

Among them, there are many defects in the micro-mixer: 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 at the molecular level. Diffusion motion on the surface makes it difficult to mix trace liquids

[0004] The Chinese patent publication number is CN 102145265 A, the application number is 201110091097.8, and the name is "a piezoelectric microfluidic mixer". Although the disclosed mixer has fast response and high mixing efficiency, its flow rate is low and cannot flow continuously. Large resistance and high energy consumption are not suitable for occasions that require continuous outflow and no backflow

[0005] Existing active micro-mixers are less, and many active micro-mixers are not a complete set of integrated chip structures, but only use extra energy to promote fluid mixing, and still need other power sources, such as syringe pumps to deliver fluids, which It is not conducive to the integration and mass production of chips

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