Why does the ultrasonic cleaner sometimes make a buzzing sound?
The sound people hear is a sound wave signal with a frequency of 20-20000Hz, and the sound wave above 20000Hz is called an ultrasonic wave. When the signal acts on the liquid, it will produce a certain negative pressure on the liquid, that is, the volume of the liquid increases, the molecular gap in the liquid increases, and many tiny bubbles are formed. The liquid generates a certain positive pressure, that is, the volume of the liquid is compressed and reduced, and the tiny air bubbles formed in the liquid are crushed.
Research has proven that:
When ultrasound acts on a liquid, the rupture of each bubble in the liquid will generate a shock wave with extremely high energy, which is equivalent to instantaneously generating a high temperature of several hundred degrees and a pressure of up to thousands of atmospheres. This phenomenon is called "cavitation". , Ultrasonic cleaning is to use the shock wave generated by the rupture of bubbles in the liquid to achieve the effect of cleaning and scouring the inner and outer surfaces of the workpiece.
The second ultrasonic wave propagates in the liquid, so that the liquid and the cleaning tank vibrate together at the ultrasonic frequency. When the liquid and the cleaning tank vibrate, they have their own natural frequency. This vibration frequency is the frequency of the sound wave, so people hear the buzzing sound. .
