Detailed Knowledge Of Ultrasonic Atomization

Update time:26-12-2020

Ultrasonic atomizers, compared to traditional atomizing […]

Ultrasonic atomizers, compared to traditional atomizing nozzles, are still quite good, and they are more environmentally friendly and convenient to use. What is the difference between ultrasonic atomization technology? Next, I will give you a specific introduction.

Ultrasonic atomization process
Ultrasonic atomizer uses high-frequency sound waves (beyond the range of human sound perception) to produce atomization. The disc-shaped piezoelectric ceramic transducer receives the high-frequency electric energy from the broadband ultrasonic generator and converts it into vibrating mechanical motion of the same frequency. The two titanium cylinders coupled with the transducer will mechanically vibrate Enhanced. The shock formed by the transducer produces a continuous sound wave along the length of the nozzle. The amplitude of the sound wave is the largest when it reaches the atomization surface, which is the small diameter part at the foremost tip of the nozzle. Generally speaking, high-frequency nozzles are smaller in size and produce smaller droplets, while lower-frequency nozzles have a lower flow rate. The liquid is introduced to the atomization surface through a large, non-blocking channel over the entire length of the nozzle. The liquid appearing on the atomizing surface absorbs the vibration energy and is therefore atomized.

Composition of ultrasonic atomizing nozzle
The typical nozzle body is made of titanium material, because of its outstanding acoustic properties, high tensile strength and excellent corrosion resistance. The protective shell is made of 316 stainless steel (titanium can also be selected).

Features of Ultrasonic Atomizer
The input energy level is used to distinguish the ultrasonic nozzle from other ultrasonic equipment, such as ultrasonic welding machine, ultrasonic emulsifier and ultrasonic cleaning machine. The working power of those ultrasonic equipment is usually several hundred or several kilowatts, but for ultrasonic atomization, the input power level is generally from 1 to 15 watts.

Ultrasonic atomization spraying is the use of piezoelectric effect to convert electrical energy into high-frequency mechanical energy, thereby atomizing liquid. Ultrasonic high-frequency oscillation is used to atomize liquid into uniform micron-sized particles. Compared with traditional pressure nozzles, ultrasonic spraying can obtain a more uniform, thinner and more controllable film coating, and it is not easy to block the nozzles. Because the ultrasonic spray nozzle only needs a tiny air volume of kilopascals, there is almost no splash during the spraying process, so the paint utilization rate is as high as 90%.

Additional features
Liquid delivery pump: Ultrasonic nozzles can be used with various liquid delivery systems, such as syringe pumps, gear pumps, peristaltic pumps, pressure tanks, etc. No matter which system is used, any of these systems will work as long as the liquid is delivered at a stable flow rate within the working range of the nozzle. However, pulsation should be avoided, even a momentary pulse may cause the liquid to Ultrasound equipment fall outside the operating range. This is especially noticeable for low flow applications such as stent coating.

Ultrasonic atomizing syringe pump
Diversion device: Because the droplets usually drift downward under the action of gravity, when installing the atomization head, the tip of the atomization head should be downward to minimize the interference of air. If directional focusing is required to achieve the desired coating effect, an air baffle can be used to guide the airflow. (Under certain conditions, the ultrasonic nozzle can be said to be an airless system. The air supply system is usually used to shape the atomized plume to provide direction and strength. In this case, air is used as an auxiliary.)

The advantages of ultrasonic atomization
Ultrasonic atomization spraying is a successful technique, such as applying high-performance and high-quality thin coatings to substrates. Through precise control of each process parameter of ultrasonic atomization, overspray is avoided and precise droplet distribution is achieved. The advantage of ultrasonic atomization is that it can completely control the droplet size, spray intensity and droplet velocity. Industrial ultrasonic atomizer can be easily changed. Ultrasonic spray drying is a very effective non-heat treatment technology. Due to its mildness, it is very effective for heat-sensitive materials.