Since beyond the range of the human ear audible sound waves called ultrasound, then why in the ultrasonic cleaning machine work, still can not hear the sound produced by ultrasound? It is said that the more sound the ultrasonic cleaning machine makes, the better the cleaning effect. Is that true?

Take these questions to analyze the ultrasonic cleaning and its sound origin.

The principle of ultrasonic cleaning

It is clear that the principle of ultrasonic cleaning is: the use of ultrasound cavitation effect, in the solid and liquid interface to create a high-speed micro-jet, and then remove or weaken the boundary of the pollutants, increase the mixing effect, speed up the dissolution of soluble stains, enhance the cleaning effect of chemical cleaning agents, so can reduce the use of chemical cleaning agents, and can not use chemical cleaning agents. Compared with chemical cleaning, ultrasonic cleaning is more convenient and environmentally friendly.

Characteristics of ultrasonic cleaning

1, ultrasonic cleaning can greatly improve the cleaning object surface cleanliness;

2. The speed of ultrasonic cleaning is very fast and the effect is obvious

3. Ultrasonic cleaning is more suitable for tedious parts with style construction;

4, ultrasonic cleaning can be a large number of small parts cleaning.

What is the cavitation effect of ultrasound?

Ultrasonic cavitation is the effect of liquid Sonication causing a large number of non-stationary tiny bubbles (about 50μm to 500μm in diameter) , with the vibration of ultrasonic wave, the bubble turns into a cycle of rapid enlargement, collapse and closure.

Where does the sound of ultrasonic cleaning come from?

1, ultrasonic cleaning sound is the vast majority of the ultrasonic cavitation process generated, so also known as“Cavitation noise.”. Only by using cavitation effect to clean, most of the cavitation noise is inevitable, it must be caused with the occurrence of cavitation effect.

In essence, cavitation noise is produced in the following way: ultrasonic waves cause ultrasonic cavitation in water, and when the cavitation bubble closes it causes fundamental harmonic (consistent with ultrasonic frequency f _ 0) and fractional harmonic (1/2 f _ 0,1/3 f _ O...) , this kind of harmonic adds up to form a cavitation noise, among which the frequency of frequency-divider harmonic is relatively low, it may enter into the range of frequency clearly audible to the human ear, and become the source of sound produced by ultrasonic cleaning. The lower the ultrasonic frequency, the more divisional harmonics can be heard, so the louder the sound.

Another part of the sound is from the cleaning tank vibration. The vast majority of manufacturers of ultrasonic cleaning machines attach Ultrasonic transducer directly to the bottom of the tank body, partly because of the lower cost and partly because it is easier to dissipate heat. Thus, the ultrasonic vibration will not only cause a lot of noise, but also accelerate the fatigue of the tank body, and cause many problems such as weld leakage and crack. Because professional manufacturers prefer to use the input or vibration plate type of ultrasonic installation.

According to the ultrasonic cleaning machine sound intensity to measure the quality of equipment is not practical. The sound intensity of the ultrasonic cleaning machine is not proportional to the cleaning effect, the lighter the sound, the better the cleaning effect (although there is a chance that lower energy efficiency will result in lower sound intensity) .

In short, there is a relatively high-tech ultrasonic cleaning, in the purchase of equipment must consult the professional manufacturers, must not blindly pursue low prices, buy a cheap use of the expensive predicament.