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Working Principle of Ultrasound Cleaner
Ultrasound is a kind of sound wave whose frequency is higher than 20,000 Hz. It has good direction, strong penetration ability, easy to obtain concentrated sound energy, and can spread far in water. It can be used for ranging, velocity measurement, cleaning, welding, gravel, sterilization and disinfection, etc. There are many applications in medicine, military, industry and agriculture. Ultrasound is named because its lower frequency limit is approximately equal to the upper hearing limit. The principle of the ultrasonic cleaning machine is mainly through transducer, which converts the sound energy of the power ultrasonic frequency source into mechanical vibration, and radiates the ultrasonic wave to the cleaning liquid in the tank by cleaning the tank wall. Due to the radiation of ultrasonic wave, the micro-bubbles in the liquid in the tank can keep vibration under the action of acoustic wave.
When the pressure of sound or sound intensity reaches a certain level, the bubbles expand rapidly and then close suddenly. In this process, shock waves are generated at the instant of bubble closure, resulting in 1012-1013 PA pressure and local temperature regulation around the bubble. This huge pressure generated by ultrasonic cavitation can destroy insoluble dirt and make them differentiate into solution. Steam-type cavitation directly repeats the impact on dirt.
On the one hand, it destroys the adsorption of dirt and the surface of cleaning parts, on the other hand, it can cause the fatigue damage of the dirt layer and be rejected. The vibration of gas bubbles scrubs the solid surface. Once the dirty layer is seamless and drillable, the bubbles immediately "drill" into the vibration and make the dirty layer fall off. Because of cavitation, the two liquids disperse rapidly at the interface. Emulsification, when solid particles are coated with oil and adhere to the surface of cleaning parts, oil is emulsified and solid particles fall off by themselves. When ultrasound propagates in cleaning liquid, it will produce positive and negative alternating sound pressure, forming jet and impacting cleaning parts. At the same time, because of the non-linear effect, sound flow and micro-sound flow will be generated, while ultrasonic cavitation will occur in solid and liquid. High-speed micro-jet will be generated at the body interface, all of which can destroy the dirt, remove or weaken the boundary layer, increase the stirring and diffusion, accelerate the dissolution of soluble dirt, and strengthen the cleaning effect of chemical cleaning agent. It can be seen that all the places where the liquid can be immersed and the sound field exists have cleaning effect. Its characteristics are suitable for cleaning parts with very complex surface shape. Especially after using this technology, the amount of chemical solvents can be reduced, thus greatly reducing environmental pollution.
When the pressure of sound or sound intensity reaches a certain level, the bubbles expand rapidly and then close suddenly. In this process, shock waves are generated at the instant of bubble closure, resulting in 1012-1013 PA pressure and local temperature regulation around the bubble. This huge pressure generated by ultrasonic cavitation can destroy insoluble dirt and make them differentiate into solution. Steam-type cavitation directly repeats the impact on dirt.
On the one hand, it destroys the adsorption of dirt and the surface of cleaning parts, on the other hand, it can cause the fatigue damage of the dirt layer and be rejected. The vibration of gas bubbles scrubs the solid surface. Once the dirty layer is seamless and drillable, the bubbles immediately "drill" into the vibration and make the dirty layer fall off. Because of cavitation, the two liquids disperse rapidly at the interface. Emulsification, when solid particles are coated with oil and adhere to the surface of cleaning parts, oil is emulsified and solid particles fall off by themselves. When ultrasound propagates in cleaning liquid, it will produce positive and negative alternating sound pressure, forming jet and impacting cleaning parts. At the same time, because of the non-linear effect, sound flow and micro-sound flow will be generated, while ultrasonic cavitation will occur in solid and liquid. High-speed micro-jet will be generated at the body interface, all of which can destroy the dirt, remove or weaken the boundary layer, increase the stirring and diffusion, accelerate the dissolution of soluble dirt, and strengthen the cleaning effect of chemical cleaning agent. It can be seen that all the places where the liquid can be immersed and the sound field exists have cleaning effect. Its characteristics are suitable for cleaning parts with very complex surface shape. Especially after using this technology, the amount of chemical solvents can be reduced, thus greatly reducing environmental pollution.
The second ultrasonic wave propagates in the liquid, making the liquid and the cleaning tank vibrate together under the ultrasonic frequency. When the liquid and the cleaning tank vibrate, they have their own natural frequency. This vibration frequency is the acoustic frequency, so people hear buzz.
In addition, in the process of ultrasonic cleaning, the bubbles visible to the naked eye are not vacuum nucleus bubbles, but air bubbles, which can inhibit the cavitation and reduce the cleaning efficiency. Only when the air bubbles in the liquid are completely dragged away, the vacuum nucleus group bubbles with cavitation can achieve the best effect.