Knowledge | 2022-03-28
How important to choose the frequency of sonic cleaner?
Ultrasonic cleaning machine has a lot of frequencies, such as 28kHz, 40kHz / 42kHz, 65kHz, 80kHz, 120kHz, or even higher. So how do you choose? Which frequency is suitable for your own needs? The principle of ultrasonic cleaning is to use the frequency of vibration. Therefore, the frequency is mainly affecting the speed of vibration. The higher the frequency, the faster the speed. The smaller the magnitude of the vibration, the smaller the damage to the object.
If you clean metal parts such as hardware, 28-40kHz can meet the requirements. If you clean the circuit board, high precision electronic components, the frequency should be more than 40kHz. The standard model of the blue whale is 40 kHz. It adapts to most of the cleaning needs. If there is a special requirement, a custom service can be provided.
Importance of frequency of ultrasonic cleaning machine
When the ultrasonic cleaning machine has a low operating frequency (within the human hearing range), noise is generated. When the frequency is less than 20 kHz, the working noise becomes large. This may exceed the limitations of safe noise specified in occupational safety and health care or other regulations. In applications requiring high power removal soil without considering workpiece injury, a lower cleaning frequency from 20 kHz to 30 kHz is usually selected. This frequency range is often used to clean the workpiece of large, heavy parts or high-density materials.
20kHz magnetic transducer and 28kHz piezoelectric transducer
High frequency is typically used to clean smaller, more precise parts, or remove tiny particles. The high frequency is also used in applications that are not allowed by the surface of the workpiece. Use high frequencies to improve cleaning performance from several aspects. As the frequency increases, the number of void bubbles increases. Thereby producing more intensive shock waves to enable it into smaller seams. If the power remains unchanged, the cavitation bubble is small, and the energy released is reduced accordingly. This effectively reduces damage to the workpiece. Another advantage of high frequency is to reduce the viscous boundary layer (Moori effect). The ultrasonic waves can "find" extremely small particles. This situation is similar to the small stones at the bottom of the river when the water level in the creek is lowered.