Research On Technology Of Ultrasonic Array Driver Power For Industrial Liquefaction

With the development of ultrasonic power technology and power ultrasonic transducers,ultrasonic systems based on power ultrasonic technology have been widely used in fields such as graphene dispersion,food emulsification,drug extraction,and sewage treatment,and have gradually developed from laboratory level to industrial level.However,under complex working environments and variable liquid loads,the current ultrasonic systems have problems with transducer resonance frequency and power fluctuation,which affect the ultrasonic liquidation effect.To improve liquidation efficiency,multiple ultrasonic vibrators are often used in industrial applications,but because the ultrasonic power supply for each vibrator is independent,it is difficult to achieve synchronous control of vibrators,which affects efficiency.Therefore,this paper conducts the following research:First,based on the equivalent circuit model of ultrasonic vibrators,the paper studies the influence mechanism of different loads on the dynamic resistance of ultrasonic vibrators for liquidation.The dynamic resistance and temperature change characteristics of ultrasonic vibrators under different immersion depths,liquid temperatures,liquid concentrations,and liquid viscosities were analyzed and designed for experimental verification,and the load change and temperature response curve of ultrasonic vibrators were obtained.Subsequently,by calculating the phase characteristic curve of ultrasonic vibrators under different dynamic resistances,it was found that when the dynamic resistance caused by large loads increases,the positive phase frequency point of the phase curve of ultrasonic vibrators gradually decreases,thereby affecting the tracking stability of resonance frequency.Secondly,a model of the ultrasonic vibrator was constructed using COMSOL6.0,and finite element simulation analysis was conducted by placing both a single vibrator and four vibrators in water.Under a single vibrator,the simulation obtained the vibration mode distribution of the ultrasonic vibrator,with the maximum amplitude at the bottom of the tool head,and verified the influence trend of the immersion depth of the ultrasonic vibrator tool head on the impedance characteristics.Additionally,this paper analyzed the sound pressure and sound pressure level of multiple ultrasonic vibrators and a single ultrasonic vibrator.The results showed that the maximum sound intensity in the water under multiple vibrators is much higher than that of a single vibrator,which helps to exceed the cavitation threshold of the liquid,making it easier to generate cavitation effects.Finally,based on the scenario of multiple ultrasonic vibrators in industrial applications,an array-type ultrasonic power supply system was designed.By dividing the array-type ultrasonic system into a mainframe and multiple slave machines and using 485 bus communication technology to connect them into a whole,the mainframe achieves synchronous control of all the slave machines.To drive the industrial ultrasonic vibrator,a full-bridge drive and inverter circuit with a 2-kilowatt power output were designed on the slave machine,which allows for adjusting the output power through phase shifting.To meet the stable frequency tracking of the ultrasonic vibrator in various environments,this paper implemented a frequency tracking circuit based on the locking frequency chip HZ6686 developed by the project team,which achieves extremely high tracking stability with only 1Hz fluctuation in the liquefaction scenario.The designed LC matching network achieves good filtering and impedance matching effects.After testing,the overall machine efficiency can be maintained above 90% when the depth of the ultrasonic vibrator immersed in water increases from 1 section to 8 sections.By adding sensor detection circuits,network communication interfaces,and data storage circuits on the mainframe,the mainframe obtains the operating status and sensor data from the slave machines,which can be saved on U disks and SD cards and also supports data upload through the network interface.This provides a terminal foundation for the Io Tization of array ultrasonic liquefaction systems.