Ultrasonic cleaning machine has been widely used in CSSD, but the understanding and monitoring of ultrasonic cleaning machine seems far less than automatic cleaning machine. If we all know that the main mechanism of ultrasonic cleaning is "cavitation effect", let's ask ourselves a question: what is cavitation effect
Ultrasonic wave is a kind of mechanical wave, which can be divided into two types. One of them is called shear wave, just like water wave and wheat wind wave. Every point above the wave is undulating up and down, perpendicular to its propagation direction, will produce a crest and trough. The other is called longitudinal wave, which is similar to spring vibration. The motion direction of each point on the wave is consistent with its propagation direction, resulting in sparse part and dense part. Ultrasonic wave is a method to produce cavitation effect
The liquid is added into the tank, and the electric energy is converted into the mechanical energy of ultrasonic after being electrified. Because ultrasonic wave is a kind of density change, the pressure of liquid also changes. At a certain point, when the liquid is in the sparse part, the pressure is equivalent to the negative pressure, the water is "torn", and a vacuum bubble appears in the middle; Then the point becomes dense part, the compression force increases, the small vacuum bubble is squeezed inward and ruptured under the action of sound field, the bubble is constantly generated in the liquid, grows rapidly, and then suddenly closes. At the moment of closing, a strong shock wave is generated. Under the action of the shock wave, the dirt layer is peeled off. This is the process of "cavitation"
It should be noted that the "bubble" and "explosion" here are different from the "balloon blowing" and "balloon explosion" we see every day. The water is more fluid because there is no space in it. It is just a small space torn by the relative negative pressure formed by the longitudinal wave. Its explosion is not outward explosion, but inward contraction, to restore the continuous state of liquid
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