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Working Process of Ultrasound Cleaning
发布时间：2019-09-24 14:36:11
Ultrasound cleaning is the direct and indirect effect of the cavitation, acceleration and direct inflow of ultrasound on liquid and dirt, so that the dirt layer is dispersed, emulsified and peeled to achieve the purpose of cleaning. In the industrial ultrasonic cleaning machine, the cavitation and direct inflow are more widely used.
Cavitation
Cavitation is the transmission of ultrasonic waves to liquids by means of high frequency conversion of compression force and pressure reduction interaction more than 20,000 times per second. In the process of pressure reduction, vacuum nucleus bubbles are produced in liquid. In the process of compression, vacuum nucleus bubbles produce strong impact force when crushed under pressure, which strips the dirt on the surface of the cleaned products, so as to achieve the purpose of precise cleaning.
In the process of ultrasonic cleaning, the bubbles visible to the naked eye are not vacuum nucleus bubbles, but air bubbles, which can inhibit the cavitation and reduce the cleaning efficiency. Only when the air bubbles in the liquid are completely removed, the vacuum nucleus group bubbles with cavitation can achieve the best effect.
Direct flow
The phenomenon that ultrasound flows along the direction of sound propagation in liquid is called direct flow. When the intensity of sound wave is 0.5W/cm2, the direct inflow can be seen with naked eyes, and the flow is generated perpendicular to the vibration surface. The velocity of flow is about 10cm/s. Through this direct inflow, the micro-oil dirt on the surface of the cleaned object is stirred, and the cleaning liquid on the surface of the dirt also generates convection. The solution of the dissolved dirt is mixed with the new solution, which speeds up the dissolution and plays a great role in the removal of the dirt.
Acceleration
Acceleration produced by liquid particles. For the high frequency ultrasonic cleaning machine, the cavitation effect is not significant. At this time, the ultrasonic cleaning mainly relies on the acceleration impact particles under the action of liquid particle ultrasound to carry out ultra-precision cleaning.
