Structural Design And Performance Research Of Streamlined Flow Tube Valveless Piezoelectric Pump

Because there was valveless piezoelectric pump has simple structure,miniaturization,integration,diversification,and can realize macroscopic guide fluid on a one-way flow by changing the design of the structure of these advantages,to cause the attention of many scholars,and spend a lot of manpower and material resources on a variety of applications for its research since it was put forward.At present,the valveless piezoelectric pump can be used in the field of aviation and astronautics,fuel supply or liquid conveying device,liquid cooling device in miniature system,liquid conveying in medical biology,micro liquid conveying in chemical industry.The transportation of medical biological liquid involves strict requirements on the transportation environment,such as blood,cells and other substances.The transportation device needs to have both low vortex and large flow performance,otherwise the physical and biological properties of the transported substances will be destroyed.In the current research,the valveless piezoelectric pump with low vortex performance has a small flow,while the valveless piezoelectric pump with large flow performance has a large vortex,which cannot meet the requirements.Therefore,if the research on the valveless piezoelectric pump can be strengthened to give consideration to the performance of low vortex and large flow,the application field of the valveless piezoelectric pump will be expanded and the practicability of the valveless piezoelectric pump will be improved.This research is to design a kind of both low vortex and large flow rate the performance of two valveless piezoelectric pump is result oriented,based on the streamline can decrease the curl,reduce the flow resistance characteristics,puts forward a streamlined flow pipe valve piezoelectric pump,and the structure design and theoretical analysis,simulation,performance test and structure optimization of five direction the case for research.The main research contents and achievements of this paper are as follows:1.According to the features of streamlining to reduce curl and flow resistance and the characteristics of large head and thin body,front circle and back point,a streamlining curve composed of hyperbola and arc is constructed.On this basis,a streamlining flow tube and its corresponding valveless piezoelectric pump are designed.Based on the theory of fluid continuity and energy conservation,the valveless piezoelectric pump(VPPST)with streamline tube is analyzed theoretically,and the working principle of the pump is described.2.A streamline flow tube and its corresponding valveless piezoelectric pump were designed under specific geometric parameters.By simulating the state of flow field inside the streamline pipe and pump,the pressure diagrams and velocity diagrams are obtained.The results shows that the flow tube has the characteristics of positive and negative flow resistance difference and has the function of valve.The curl of the flow field inside the VPPST is small,and it has low vortex performance.3.Three groups of pump prototypes were made by 3D integrated printing technology,among which two groups were conical flow tube valveless piezoelectric pumps(CFTVP)as the control group.The flow resistance difference characteristics of each flow tube and the output performance of the pump prototype were experimented,and the experimental results were analyzed,which revealed the principle that the streamline flow tube can reduce the flow resistance and increase the flow rate,and confirmed that the streamline pump has the large-flow performance.4.In combination with the design method of thes flow tube,designing and manufacturing three groups category flow pump,discusses its design parameters,different streamline curves and streamline the internal connection of pump performance.In order to studies the influence law of flow tube structure on the pump performance to facilitate optimize the structure of the flow tube and solve the matching problem between the performance demand of VPPST and flow tube structure in different applications.