The principle of ultrasonic cleaning

Ultrasonic cleaning first appeared in the 1930s, after that, its extensive research and application have never been interrupted. Ultrasonic cleaning has only a few decades of history, but its superior performance and economy and environmental protection have been fully demonstrated. Ultrasonic cleaning has quickly become an indispensable part of a variety of industries and a variety of product manufacturing processes.

The principle of ultrasonic cleaning can be introduced into the following aspects.

1. The high-frequency oscillation signal emitted by the ultrasonic generator is converted into a high-frequency mechanical vibration wave by the transducer and propagated to the cleaning medium.

2. Ultrasonic waves radiate forward in the cleaning liquid in dense and dense phases, causing the liquid to flow and generate countless tiny bubbles. When the liquid is impacted by ultrasonic waves above 20 kHz and the sound pressure reaches a certain value, the tiny bubbles (cavitation nuclei) in the liquid are The positive and negative pressure alternately causes the bubble to increase rapidly and then suddenly close. Ultrasonic energy causes a "cavitation effect" in the cleaning medium.

3. The "cavitation effect" in the liquid makes the tiny bubbles produce high-frequency vibration scrubbing on the surface of the workpiece; the local high temperature and high pressure generated at the moment the bubble closes weakens the insoluble dirt (or oil) intermolecular force and makes them dispersed In the liquid, so as to peel off the adhesion between the dirt and the surface of the workpiece.

4. The ultrasonic energy in the cleaning liquid continuously produces cavitation effect and washes the surface of the workpiece, so that the surface of the workpiece is non-destructive and clean.

The effect of ultrasonic cleaning mainly depends on the matching of the generator and the transducer (the frequency is the same, the power is appropriate) and the cleaning time, in addition to the installation of the ultrasonic vibrator and the type of cleaning medium, concentration, temperature, flow, etc. relation.