钹型开槽式阀压电泵的理论与试验研究
[Abstract]:With the development of science and technology and the progress of MEMS manufacturing technology, the fields of aerospace, biomedicine and fine chemistry have higher requirements for microfluid transport, which has greatly promoted the development of micropumps. Piezoelectric actuated micropump with piezoelectric material as the driving component has the characteristics of rapid response, high energy density, high integration and no electromagnetic interference, etc., which has attracted the attention of many researchers at home and abroad. Therefore, microchemical mixing, fuel cells, biological detection, insulin injection and other fields have a wide range of applications. As the core component of piezoelectric pump with valve, the reliability of one-way starting and stopping valve plays an important role in the life and performance of piezoelectric pump. When the piezoelectric pump is in operation, the frequent reciprocating movement of the one-way starting and stopping valve will easily cause fatigue damage to the valve body, and the traditional cantilever valve body will also easily lead to stress concentration, which will aggravate the fatigue damage and eventually lead to the failure of the valve body. With the valve pump also can not work properly. In this paper, a cymbal slotted valve body is proposed, which is composed of cymbal diaphragm and cymbal diaphragm in order to reduce the stress on the valve body, improve the service life of the valve body and increase the reliability of the piezoelectric pump with valve. And according to cymbals type slotted valve body design cymbal type slotted valve pressure pump. The research work of cymbals slotted valve piezoelectric pump and its related parts are as follows: 1. Based on the theory of material mechanics, the cymbal slotted diaphragm of cymbal slotted valve piezoelectric pump is derived theoretically, and the mathematical expression of cymbals slotted diaphragm opening degree and diaphragm height is established. The influence of diaphragm parameters on diaphragm opening and closing degree is clarified, the flow expression of cymbal slotted valve piezoelectric pump is established, and the relationship between oscillator parameter, diaphragm parameter, transmission medium parameter and pump flow rate is revealed. Based on static analysis, the stress comparison between cymbal slotted diaphragm and plate slotted diaphragm is carried out, the rationality of cymbal slotted valve body design scheme is demonstrated, and the effect of water body in pump on the additional mass of piezoelectric pump is considered synthetically. The harmonic response of wet mode of cymbal slotted valve piezoelectric pump is analyzed. The frequency of piezoelectric pump and the vibration form of piezoelectric vibrator are determined, which provides a reference for the construction of pump flow test platform. Based on the coupling between valve body and flow field, the fluid-solid coupling model of cymbal slotted valve piezoelectric pump is constructed, and the displacement and stress of cymbal slotted diaphragm under fluid-solid coupling are analyzed. The variation law of internal pressure and flow field of piezoelectric pump is proved, and the performance of cymbal slotted valve piezoelectric pump is further analyzed, and the feasibility of the design scheme is verified. The prototype of cymbal slotted valve piezoelectric pump was fabricated by SLA laser rapid prototyping technology, and the output characteristic test platform of cymbal slotted valve piezoelectric pump was built, and the vibration and output characteristics of piezoelectric vibrator and piezoelectric pump were tested respectively. The displacement curves of the vibrator and the flow rate of the pump are obtained at different driving frequencies, and the relationship among the vibrator amplitude, diaphragm stress and pump flow rate is expounded in combination with the fluid-solid coupling calculation results. The analysis results can provide a reference for the optimization of the diaphragm.
【学位授予单位】:江苏大学
【学位级别】:硕士
【学位授予年份】:2017
【分类号】:TH38
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