What are the principles of ultrasonic cleaning machines

The cleaning principle of ultrasonic cleaning machine is that the high-frequency oscillation signal emitted by the ultrasonic generator is converted into high-frequency mechanical oscillation by the transducer and propagated to the medium---cleaning solvent. The ultrasonic wave radiates forward in the cleaning liquid in a sparse and dense manner, causing the liquid to flow and generate tens of thousands of tiny bubbles with a diameter of 50-500μm. The tiny bubbles in the liquid vibrate under the action of the sound field. These bubbles are formed and grown in the negative pressure area of ​​the longitudinal propagation of ultrasonic waves, and in the positive pressure area, when the sound pressure reaches a certain value, the bubbles increase rapidly and then suddenly close. When the bubbles close, shock waves are generated, and thousands of atmospheres of pressure are generated around them, destroying insoluble dirt and dispersing them in the cleaning liquid. When the group particles are wrapped in oil and adhere to the surface of the cleaning parts, the oil is emulsified and the solid particles are separated, thereby achieving the purpose of cleaning the cleaning parts.

In this process called "cavitation" effect, the closure of bubbles can form a high temperature of several hundred degrees and an instantaneous high pressure of more than 1,000 atmospheres. The continuous generation of instantaneous high pressure is like a series of small "explosions" that continuously impact the surface of the object, causing the dirt on the surface and in the gaps of the object to quickly peel off, thereby achieving the purpose of cleaning and purifying the surface of the object.

The second ultrasonic wave propagates in the liquid, causing the liquid and the cleaning tank to vibrate together at the ultrasonic frequency. The liquid and the cleaning tank have their own inherent frequency when vibrating. This vibration frequency is the sound wave frequency, so people hear a buzzing sound.

In addition, in the ultrasonic cleaning process, the bubbles that can be seen by the naked eye are not vacuum core group bubbles, but air bubbles, which inhibit the cavitation effect and reduce the cleaning efficiency. Only when the air bubbles in the liquid are completely dragged away can the vacuum core group bubbles of cavitation achieve the best effect.