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Ultrasonic wave propagation in a liquid, the liquid together with the cleaning tank ultrasonic frequency vibration, liquid and wash tank has its own natural frequency of a vibrating, the vibration frequency is the frequency, so people hear buzzing. With the development of cleaning industry, a growing number of industries and enterprises applied to ultrasonic cleaning machines.

Ultrasonic cleaner principle issued by the ultrasonic generator of high frequency oscillation signal through the transducer converts high-frequency mechanical vibration transmitted to medium-solvent cleaning, ultrasonic cleaning fluid of density in radiation, the liquid flow to produce tens of thousands of tiny bubbles 50-500 µ m in diameter, found in tiny bubbles in a liquid under the sound vibrations. These bubbles in ultrasonic longitudinal spread of negative pressure zone formation, growth, and positive pressure areas, when the pressure reaches a certain value, the bubbles grow quickly, then suddenly closed. And produce shock waves in air bubbles closed, thousands in surrounding atmosphere, undermine the insoluble dirt and distracting them from cleaning solution, when a group of particles wrapped in oil-sticking on when cleaning surfaces, oils are emulsified, solid particles and disengage, so as to achieve the purpose of cleaning and purification. This is called "CAVITATION" effect in the process of bubble close to form hundreds of degrees and more than 1000 bar of instantaneous high pressure.