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超声频率与功率密度的简介

作者:超声波清洗机生产厂家 来源:http://www.jnthcsb.com 时间:2021-03-09 13:53:59

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安全噪音的限度。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 produced. When the frequency is lower than 20kHz, the working noise not only becomes very loud, but also may exceed the safety noise limit stipulated by relevant regulations. In the application that needs high power to remove dirt without considering the surface damage of workpiece, the lower cleaning frequency from 20kHz to 30kHz is usually selected. The cleaning frequency in this frequency range is often used to clean large, heavy parts or 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,或清除微小颗粒。高频还被用于被工件表面不允许损伤的应用。

Ultrasonic cleaning equipment manufacturers tell you: high frequency is usually used to clean smaller parts, or remove small particles. High frequency is also used in applications where the surface of the workpiece is not allowed to be damaged.

超声频率与功率密度的简介(图1)

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。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。

The use of high frequency can improve the cleaning performance from several aspects. With the increase of frequency, the number of cavitation bubbles increases linearly, resulting in more and more dense shock waves, which can enter into smaller gaps. If the power remains unchanged, the cavitation bubble becomes smaller, and the energy released is reduced accordingly, which effectively reduces the damage to the workpiece surface.

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.

Another advantage of high frequency is that it reduces the viscous boundary layer (ponuri effect), which makes it possible for ultrasound to 'discover' 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。

The higher the ultrasonic power density is, the stronger the cavitation effect is, the faster the cleaning speed is, and the better the cleaning effect is. 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 ℃.