1.空化作用
1. Cavitation effect
空化作用就是超聲波以每秒兩萬次以上的壓縮力和減壓力交互性的高頻變換方式向液體進行透射。在減壓力作用時,液體中產(chǎn)生真空核群泡的現(xiàn)象,在壓縮力作用時,真空核群泡受壓力壓碎時產(chǎn)生強大的沖擊力,由此剝離被清洗物表面的污垢,從而達到精密洗凈目的。
Cavitation is the high-frequency transformation of ultrasonic waves into a liquid through the interaction of compression force and pressure reduction at least 20000 times per second. During pressure reduction, a phenomenon of vacuum core bubbles is generated in the liquid. When compressed, the vacuum core bubbles generate a strong impact force when crushed by pressure, thereby stripping the dirt on the surface of the cleaned object and achieving precision cleaning.
在超聲波清洗過程中,肉眼能看見的泡并不是真空核群泡,而是空氣氣泡,它對空化作用產(chǎn)生抑制作用降低清洗效率。只有液體中的空氣氣泡被完全脫走,空化作用的真空核群泡才能達到效果。
During the ultrasonic cleaning process, the visible bubbles are not vacuum core bubbles, but air bubbles, which inhibit cavitation and reduce cleaning efficiency. Only when the air bubbles in the liquid are completely removed can the vacuum core bubble of cavitation achieve its effect.
2.直進流作用
2. Direct inflow effect
超聲波在液體中沿聲的傳播方向產(chǎn)生流動的現(xiàn)象稱為直進流。聲波強度在0.5W/cm2時,肉眼能看到直進流?垂直于振動面產(chǎn)生流動,流速約為10cm/s。通過此直進流使被清洗物表面的微油污垢被攪拌,污垢表面的清洗液也產(chǎn)生對流,溶解污物的溶解液與新液混合,使溶解速度加快,對污物的搬運起著很大的作用。
The phenomenon of ultrasonic waves flowing in the direction of sound propagation in a liquid is called direct inflow. When the sound wave intensity is 0.5W/cm2, can the naked eye see the direct inflow? Flow is generated perpendicular to the vibrating surface, with a flow rate of approximately 10cm/s. Through this direct inflow, the micro oil and dirt on the surface of the cleaned object are stirred, and the cleaning solution on the dirt surface also generates convection. The dissolved solution of the dirt is mixed with the new solution, which accelerates the dissolution rate and plays a significant role in the transportation of the dirt.
3.加速度作用
3. Acceleration effect
液體粒子推動產(chǎn)生的加速度。對于頻率較高的超聲波清洗機,空化作用就很不顯著了,這時的清洗主要靠液體粒子超聲作用下的加速度撞擊粒子對污物進行超精密清洗。
The acceleration generated by the propulsion of liquid particles. For high-frequency ultrasonic cleaning machines, the cavitation effect is not significant. At this time, the cleaning mainly relies on the acceleration of liquid particles under the ultrasonic action to impact particles for ultra precision cleaning of dirt.
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