The Structure Design And Simulation Of Ultrasonic Transducer With High Output Performance And Its Experimental Study

With rapid development of information technology, the traditional high-power devices has beendifficult to meet the growing demand in the engineering field; while ultrasonic transducer andsono-reactor with small size, large power and high energy efficiency are the methods to solve theseproblems. Ultrasonic transducer is an energy conversion device in the range of ultrasonic frequency;Sono-reactor is a container or system where chemical reaction is running by ultrasonic wave.In this work, a box type reactor’s energy efficiency was analysed and researched: the sound fielddistribution was simulated by COMSOL software in different of box structure, sound field boundarycondition, dielectric absorption coefficient and the working frequency; And the corresponding PamandNUIwas calculated for the first time; Based on the simulation results, the structure and size of theultrasonic reactor was decided.Using calorimetric method and sodium hyposulphite solution titration method, the wholesystem’s cavitation intensity, energy efficiency, cavitation efficiency and electroacoustic efficiencyhave been measured. Experimental results show that: the total energy efficiency decreases with theincrease of input electric power for the sono-reactor; The total energy efficiency of the sono-reactor ishigher when the radiation surface is smaller; In the non-resonant frequency of21kHz, cavitation effectin the sonicated water is the strongest when the driving circuit is in resonance; when the workingfrequency is resonant, the total energy efficiency of12.13kHz is greater than that of57.05kHz.Therefore, in order to meeting high energy efficiency and high output performance requirements, ithas to consider the energy conversion efficiency and cavitation effect at the same time.Besides, it is found that ultrasonic transducer can fever when operating in the high energyefficiency. The heat accumulation can reduce the system’s energy efficiency. Based on the ultrasonictransducer’s heat dissipation problems, a cooling type ultrasonic transducer are designed in this paper,which can improve the stability of the transducer and shorten the heat transient process. It is foundthat the cooling type transducer’s temperature rise slower, balance temperature is lower and thevariation of resonance frequency is smaller than traditional transducer when the input power is same.Besides, the cooling type transducer has more out power and better stability in the same rising processof the equilibrium temperature.