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超聲頻率與功率密度需要注意什么？

作者：admin來源：http://www.zhuohengsh.com/時間：2021-09-10

超聲頻率：

Ultrasonic frequency:

當工作頻率很低（在人的聽覺范圍內）就會產生噪音。當頻率低於20kHz時，工作噪音不僅變得很大，而且可能超出相關條例所規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用中，通常選擇從20kHz到30kHz范圍內的較低清洗頻率該頻率范圍內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 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.

超聲波清洗機設備廠家告訴您：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，空化泡的數量呈線形增加，從而產生更多更密集的沖擊波使其能進入到更小的縫隙中。

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.

如果功率保持不變，空化泡變小，其釋放的能量相應減少，這樣有效地減小了對工件表面的損傷。高頻的另一個優勢在于減小了粘滯邊界層（泊努里效應），使得超聲波能夠'發現'細小的微粒。市場上常用頻率的產品有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=發射功率（W）/發射面積（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生"空化"腐蝕。

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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