超声频率：

Ultrasonic frequency:

当工作频率很低（在人的听觉范围内）就会产生噪音。当频率低於20kHz时，工作噪音不仅变得很大，而且可能超出相关条例所规定的噪音的限度。在需要高功率去除污垢而不用考虑工件表面损伤的应用中，通常选择从20kHz到30kHz范围内的较低清洗频率该频率范围内的清洗频率常常被用于清洗大型、重型零件或高密度材料的工件。

When the working frequency is very low (within the range of human hearing), noise will be generated. When the frequency is lower than 20kHz, the working noise not only becomes very large, but also may exceed the limit of safety noise specified in relevant regulations. In applications requiring high power to remove dirt without considering workpiece surface damage, a lower cleaning frequency in the range of 20kHz to 30kHz is usually selected. The cleaning frequency in the frequency range is often used to clean large, heavy parts or workpieces of high-density materials.

超声波清洗机设备厂家告诉您：高频通常被用于清洗较小的零件，或微小颗粒。高频还被用于被工件表面不允许损伤的应用。

The manufacturer of ultrasonic cleaning machine tells you that high frequency is usually used to clean small parts or remove small particles. High frequency is also used in applications where the workpiece surface is not allowed to be damaged.

使用高频可从几个方面改善清洗性能。随着频率的增加，空化泡的数量呈线形增加，从而产生更多更密集的冲击波使其能进入到更小的缝隙中。

The use of high frequency can improve the cleaning performance in several ways. With the increase of frequency, the number of cavitation bubbles increases linearly, resulting in more and denser shock waves, which can enter into smaller gaps.

如果功率保持不变，空化泡变小，其释放的能量相应减少，这样有效地减小了对工件表面的损伤。高频的另一个优势在于减小了粘滞边界层（泊努里效应），使得超声波能够'发现'细小的微粒。市场上常用频率的产品有28KHz、32KHz、40kHz.

If the power remains unchanged, the cavitation bubble becomes smaller and the energy released by it decreases accordingly, which effectively reduces the damage to the workpiece surface. Another advantage of high frequency is that it reduces the viscous boundary layer (Bernoulli effect), so that ultrasound can 'find' fine particles. The frequency products commonly used in the market are 28kHz, 32kHz and 40KHz

功率密度：

Power density:

功率密度=发射功率（W）/发射面积（cm2），通常≥0.5W/cm2.超声波的功率密度越高，空化效果越强，清洗速度越快，清洗效果越好。但长时间，高密度的清洗，容易造成清洗物件表面产生"空化"腐蚀。

Power density = emission power (W) / emission area (cm2), usually ≥ 0.5w/cm2. The higher the power density of ultrasonic, the stronger the cavitation effect, the faster the cleaning speed, and the better the cleaning effect. However, long-time and high-density cleaning is easy to cause "cavitation" corrosion on the surface of the cleaned object.

清洗温度：

Cleaning temperature:

一般来说，超声波在50℃-85℃时，效果好。

Generally speaking, the effect of ultrasonic is good at 50 ℃ - 85 ℃.