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超聲頻率與功率密度的簡介

作者：admin來源：http://www.400qy.cn/時間：2021-03-09

當工作頻率很低（在人的聽覺范圍內(nèi)）就會產(chǎn)生噪音。當頻率低於20kHz時，工作噪音不僅變得很大，而且可能超出相關(guān)條例所規(guī)定的安全噪音的限度。在需要高功率去除污垢而不用考慮工件表面損傷的應(yīng)用中，通常選擇從20kHz到30kHz范圍內(nèi)的較低清洗頻率該頻率范圍內(nèi)的清洗頻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.

超聲波清洗機設(shè)備廠家告訴您：高頻通常被用于清洗較小的零件，或清除微小顆粒。高頻還被用于被工件表面不允許損傷的應(yīng)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.

使用高頻可從幾個方面改善清洗性能。隨著頻率的增加，空化泡的數(shù)量呈線形增加，從而產(chǎn)生更多更密集的沖擊波使其能進入到更小的縫隙中。如果功率保持不變，空化泡變小，其釋放的能量相應(yīng)減少，這樣有效地減小了對工件表面的損傷。

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.

高頻的另一個優(yōu)勢在于減小了粘滯邊界層（泊努里效應(yīng)），使得超聲波能夠'發(fā)現(xiàn)'細小的微粒。市場上常用頻率的產(chǎn)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=發(fā)射功率（W）/發(fā)射面積（cm2），通常≥0.5W/cm2.超聲波的功率密度越高，空化效果越強，清洗速度越快，清洗效果越好。但長時間，高密度的清洗，容易造成清洗物件表面產(chǎn)生"空化"腐蝕。

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.

清洗溫度：

Cleaning temperature:

一般來說，超聲波在50℃-85℃時，效果好。

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

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