Piezoelectric stack micro-pump based on triangle and lever principle

Abstract

The invention relates to a piezoelectric stack micro-pump based on a triangle and the lever principle. The piezoelectric stack micro-pump comprises pre-fastening bolts, piezoelectric stack positioninggrooves, a bolt I, a triangle amplifying mechanism, piezoelectric stacks, a fixing plate, a lever amplifying mechanism, a piston, a bolt II, a stop valve I, a stop valve II, a pump body, a bolt III and flexible hinges. The triangle amplifying mechanism and the lever amplifying mechanism are integrally arranged. The relative rotating portions of the triangle amplifying mechanism and the lever amplifying mechanism are connected by the flexible hinges. When the symmetrically-arranged piezoelectric stacks are loaded with the same voltage, the self-output displacement is subjected to primary amplification by the triangular amplifying mechanism then is subjected to secondary amplification by the lever amplifying mechanism, finally thedisplacement output after secondary amplification is appliedto the piston, and therefore the pump has a pumping function. Compared with an existing micro-pump, a driving device of thepiezoelectric stack micro-pump is free of mechanical friction and high intheoutput displacement amount, and has the characteristics of high flow output control precision, stable output, high output flow, low manufacturing cost and the like.

Description

technical field [0001] The invention belongs to the technical field of micropumps, and in particular relates to a piezoelectric stacked micropump based on the principle of triangle and lever. Background technique [0002] Micropump is a very common fluid mechanical device, and it is also an important branch of the field of microfluidics. Its function is to convert external input energy into fluid pressure or kinetic energy. Micropumps have been widely used in chemical experiment analysis, biotechnology engineering, microchip cooling, microfluid pumping and other fields. This field has high performance requirements for micropumps, which mainly require the advantages of high flow output control accuracy, fast response speed, small structural size, and large fluid output pressure. Therefore, how to design a micropump with high control accuracy, fast response speed, and low energy consumption Micropumps with low and good one-way cut-off performance have become an important brea...

AI Technical Summary

Problems solved by technology

Magnetically controlled shape memory alloys not only have ferromagnetism but also can realize thermoelastic martensitic phase transformation. At the same time, they combine the advantages of large strain of shape memory alloys and fast response of magnetostrictive materials. Therefore, magnetically controlled shape memory alloys are used as the driving source for micro The pump has the advantages of fast response, high control precision, and output flow, but it needs to provide an excitation mechanism with a large output magnetic field power when the pump is working, which greatly increases the structural size of the micropump.

On the other hand, it is difficult for the magnetic field output by the excitation mechanism of the magnetically controlled shape memory alloy micropump to be a constant value, which will cause the output flow of the micropump to be unstable.

Although the multi-stage cantilever high-efficiency micropump can output fluid with a certain precision, it has disadvantages such as complex structure, low work efficiency, and slow response speed.

[0004] After searching the existing technical documents, it was found that in the patent "A Large Flow Valveless Micropump" written by Wang Tao et al. Improve its working output efficiency, but the valveless micropump has disadvantages such as poor one-way cut-off performance, low control precision, and slow response speed

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