Three main effects in the cleaning process of ultrasonic cleaning machine
The cleaning process of ultrasonic cleaning machine is to use the direct and indirect effects of ultrasonic cavitation, acceleration and direct inflow on liquid and dirt, so that the dirt layer can be dispersed, emulsified and stripped to achieve the cleaning purpose. At present, cavitation and direct inflow are more widely used in ultrasonic cleaners.
(1) Cavitation: Cavitation refers to the transmission of ultrasonic wave to liquid in the high-frequency transformation mode of the interaction of compression force and pressure reduction more than 20000 times per second. In the process of pressure reduction, the phenomenon of vacuum core bubble cluster is generated in the liquid. In the process of compression, the vacuum core bubble cluster is crushed under pressure, which generates a strong impact force, thus stripping the dirt on the surface of the object to be cleaned, so as to achieve the purpose of precise cleaning.
(2) Direct inflow: The phenomenon that ultrasonic waves flow in the liquid along the direction of sound transmission is called direct inflow. When the sound intensity is 0.5W/cm2, the naked eye can see the straight flow, which is perpendicular to the vibration surface to generate flow, and the velocity is about 10cm/s. Through this direct inflow, the tiny oil dirt on the surface of the object to be cleaned is stirred, and the cleaning solution on the surface of the dirt also has convection. The solution to dissolve the dirt is mixed with the new solution, which speeds up the dissolution rate and plays a great role in the transportation of the dirt.
(3) Acceleration: The acceleration generated by the push of liquid particles. For ultrasonic cleaners with high frequency, the cavitation effect is not significant. At this time, the cleaning mainly depends on the acceleration of liquid particles under the ultrasonic action to impact particles for ultra precision cleaning.