The principle and advantages of ultrasound
The ultrasonic waves propagate in the liquid, so that the liquid and the cleaning tank vibrate together at the ultrasonic frequency. When the liquid and the cleaning tank vibrate, they have their own natural frequency. This vibration frequency is the sound wave frequency, so people hear humming. With the continuous development of the cleaning industry, more and more industries and enterprises have applied ultrasonic cleaning machines.
The principle of ultrasonic cleaning machine is that the high-frequency oscillation signal sent by the ultrasonic generator is converted into high-frequency mechanical oscillation by the transducer and propagated to the medium-cleaning solvent, and the ultrasonic waves radiate forward in the cleaning liquid, making The liquid flows to produce tens of thousands of tiny bubbles with a diameter of 50-500um, and the tiny bubbles existing in the liquid vibrate under the action of the sound field. These bubbles form and grow in the negative pressure zone where the ultrasonic wave travels longitudinally, while in the positive pressure zone, when the sound pressure reaches a certain value, the bubbles increase rapidly and then close suddenly. And when the bubble is closed, a shock wave is generated, and thousands of atmospheric pressures are generated around it, destroying the insoluble dirt and making them disperse in the cleaning liquid. When the group particles are wrapped in oil and adhere to the surface of the cleaning piece, the oil is emulsified and solid Particles are separated, so as to achieve the purpose of cleaning parts purification. In this process known as the "cavitation" effect, the closure of the bubbles can form a high temperature of several hundred degrees and an instantaneous high pressure of more than 1,000 barometric pressure.
The advantages of the ultrasonic cleaning machine are: the ultrasonic cleaning effect is good, and the operation is simple. The sound that people hear is a sound wave signal with a frequency of 20-20000 Hz. The sound wave above 20000 Hz is called ultrasonic wave. One reason is that the negative pressure is formed due to the local tensile stress in the liquid, and the decrease in pressure makes the gas dissolved in the liquid supersaturated, and escapes from the liquid to become small bubbles; the other reason is that the strong tensile stress tears the liquid into a void, called cavitation.