How to choose the frequency of ultrasonic cleaning machine

超声空化阀值和超声波的频率有密切关系，频率越高，空化阀越高。超声波清洗机换句话说，频率低，空化越容易产生，而且在低频情况下液体受到的压缩和稀疏作用有更长的时间间隔，使气泡在崩溃前能生长到较大的尺寸，增高空化强度，有利于清洗作用。
The ultrasonic cavitation threshold is closely related to the ultrasonic frequency. The higher the frequency, the higher the cavitation valve. In other words, the lower the frequency, the easier cavitation is to occur, and the longer the time interval between the compression and thinning of the liquid under the low frequency condition, so that the bubble can grow to a larger size before collapse, and increase the cavitation intensity, which is conducive to cleaning.

所以低频超声清洗适用于大部件表面或者污物和清洗件表面结合度高的场合。但易腐蚀清洗件表面，不适宜清洗表面光洁度高的部件，而且空化噪音大。40KHZ左右的频率，在相同声强下，产生的空化泡数量比频率为20KHZ时多，穿透力较强，宜清洗表面形状复杂或有盲孔的工件，空化噪音较小，但空化强度较低，适合清洗污物与被清洗件表面结合力较弱的场合。高频超声清洗适用于计算机，微电子元件的精细清洗；兆赫超声清洗适用于集成电路芯片、硅片及波薄膜的清洗，能去除微米、亚微米级的污物而对清洗件没有任何损伤。因此从清洗效果及经济性考虑，频率一般选择在20130KHZ范围，当然正确选择频率至关重要，而具体合适的工作频率的选取需要做一定的实验取得。

Therefore, low-frequency ultrasonic cleaning is applicable to the occasions where the surface of large parts or the surface of dirt and cleaning parts have high adhesion. However, the surface of easily corroded parts is not suitable for cleaning parts with high surface finish, and the cavitation noise is large. At the frequency of about 40KHZ, under the same sound intensity, the number of cavitation bubbles produced is more than that at the frequency of 20KHZ, and the penetration is strong. It is suitable to clean the workpiece with complex surface shape or blind hole. The cavitation noise is small, but the cavitation intensity is low, and it is suitable for cleaning the situation where the adhesion between the dirt and the surface of the cleaned part is weak. High frequency ultrasonic cleaning is suitable for fine cleaning of computer and microelectronic components; Megahertz ultrasonic cleaning is applicable to the cleaning of integrated circuit chips, silicon wafers and wave thin films. It can remove micron and submicron dirt without any damage to the cleaning parts. Therefore, from the perspective of cleaning effect and economy, the frequency is generally selected in the range of 20130KHZ. Of course, the correct selection of frequency is crucial, and the specific and appropriate selection of working frequency needs to be obtained through certain experiments.