Development Of Piezoelectric Pump With Crescent-shaped Structure And Research On Audio Analysis And Detection Methods

Because of its simple structure,high pumping accuracy,and no electromagnetic interference,piezoelectric pumps have a wide range of applications in mechanical lubrication,biomedical transportation,microfluid mixing,precision instruments,agricultural drip irrigation,microelectronic cooling systems,and fuel cell systems.application.In particular,valveless piezoelectric pumps have become the better than some piezoelectric pumps because of their simple manufacturing and low cost.However,the backflow phenomenon of the valveless piezoelectric pump is more prominent,so designing a structure and reducing the backflow phenomenon is the focus of research on the valveless piezoelectric pump.This paper designs a new piezoelectric pump with crescent-shaped structure to reduce the backflow and widen it.The output domain of the piezoelectric pump was evaluated by audio analysis.By analyzing the existing piezoelectric pump design background and application status,it is found that increasing the forward and reverse flow-resistance difference of the valveless piezoelectric pump to reduce the return flow is an effective way to improve the output performance of the piezoelectric pump.Based on the theory of fluid mechanics,the vibration modes and fixation modes of piezoelectric oscillators are studied according to the inverse piezoelectric effect.Combining the basic working principle of the piezoelectric pump and the phenomenon of bluff body flow,the piezoelectric pump with crescent-shaped structure is proposed.Based on the law of conservation of energy and the empirical formula of the piezoelectric pump,the theoretical flow formula of the piezoelectric pump with crescent-shaped structure and the formula of the sound intensity when the piezoelectric pump is working are derived.The proposed piezoelectric pump with crescent-shaped structure is designed,and the working mechanism of the meniscus structure piezoelectric pump is analyzed.The finite element simulation method is adopted to analyze the feasibility and rationality of the piezoelectric pump with crescent-shaped structure design.The distance between the crescent-shaped structure of the piezoelectric pump and the exit,the radius of the crescent-shaped structure,and the number of crescent-shaped structures are three key points.The 3D model of each point is parameterized and optimized.The best simulation result is 0.6 mm.When the diameter is 5 mm and the number is 4th order,the output performance of the piezoelectric pump is the best.Then,a prototype pump prototype of the piezoelectric pump was produced in combination with 3D printing technology.Set up an experimental test platform for the output performance of piezoelectric pumps,conduct experimental research on piezoelectric pumps with different crescent-shaped structure distance,crescent diameter,and number of crescent-shaped structure,and explore the relationship between the output performance and input voltage and frequency of different structures of piezoelectric pumps to improve the working range of the piezoelectric pump.When the crescent-shaped structure is 0.6 mm in diameter,the crescent diameter is 5 mm,the number of crescent-shaped structure is 4th order,the input voltage is 220 V and the input frequency is 82 Hz,the best output performance of the electric pump is 286.0 mL/min.In addition,the output performance of the piezoelectric pump is analyzed and compared.The piezoelectric ceramic area is 706.5 mm~2,and the unit area flow rate is 404.812?L/min.There are obvious advantages in output performance.By analyzing the sound intensity and frequency spectrum of multiple sets of piezoelectric pumps with crescent-shaped structure,the output performance of the piezoelectric pumps is evaluated.Set up a sound test experiment platform,collect the sound intensity of the piezoelectric pump,and use Matlab software to analyze the frequency spectrum of the sound signal.Comparing the sound intensity and frequency domain spectrum analysis,it is concluded that the better the output performance of the piezoelectric pump,the lower the sound intensity of the piezoelectric pump,and the smoother the frequency spectrum of the sound signal,the fewer the extreme points of the frequency spectrum.This proves that it is feasible to evaluate the output performance of a piezoelectric pump with sound.