What is a Convergent Ultrasonic Nozzle?

Oct 04, 2024

Brief Introduction:

The converging ultrasonic atomizing nozzle is combined with low-pressure air/gas to produce a soft, highly focused beam of small droplets. Usually, compressed air/gas of 1 psi is introduced into the diffusion chamber of the air guide hood surrounding the nozzle, thereby generating a uniformly distributed air/gas flow around the nozzle rod. The spray generated by the ultrasonic wave at the tip of the valve stem is immediately entrained in the low-pressure air/airflow. The adjustable focusing mechanism on the wind deflector can fully control the spray width. The spray hood is very narrow and shaped like an hourglass. The width of the shape is controlled by adjusting the distance between the nozzle and the substrate, ranging from 0.07-1.0 inches (1.78-25 mm). Very suitable for small devices such as brackets, balloon conduits, wires, soldering flux for selective soldering applications, etc.

The gathering type ultrasonic nozzle is an ultrasonic atomizing nozzle with small spray width. The ultrasonic atomization nozzle technology is adopted, and the special contraction flow channel design will uniformly and centrally distribute the carrier gas, so that the ultrasonic atomized liquid mist is in the form of concentrated spray, thus reducing the spray area of the ultrasonic nozzle. Due to the small spraying width of the centralized ultrasonic nozzle, it is mainly suitable for various small and medium-sized spraying applications. It complements the Funsonic wide width spraying ultrasonic nozzle and can be applied to almost all different flat spraying requirements.

Application:

Typical applications include fuel cell spraying, namely membrane electrode spraying in proton exchange membrane fuel cells, where catalyst (such as platinum carbon catalyst) dispersion is ultrasonically atomized and sprayed onto the proton exchange membrane to form a uniform and dense membrane electrode. Due to the advantages of coalescence and concentrated spraying, the coalescence ultrasonic nozzle can be used for precision spraying on small areas. Therefore, the coalescence ultrasonic atomization nozzle can also be used for spraying on the surface of medical devices such as drugs. Balloon spraying and drug-eluting stent spraying. Dissolve drugs such as rapamycin and paclitaxel in organic solvents to form a drug solution, use a concentrated ultrasonic nozzle for ultrasonic atomization, and then evenly spray it onto a balloon or stent to form a uniform and dense drug coating on the surface of the balloon catheter and stent. In addition, the coalescence ultrasonic nozzle can also be applied to thin film solar cell coatings, perovskite solar cell coatings, PCB flux coatings, and other applications.

100kHZ Ultrasonic Gathering Spray Nozzle 6

Principle:

Ultrasonic nozzles convert high-frequency sound waves into mechanical energy through piezoelectric transducers, and then convert the mechanical energy into liquid. This longitudinal upward and downward vibration generates standing waves in the liquid film at the tip of the ultrasonic nozzle, where the amplitude of these waves can be controlled by a power generator. These stationary liquid waves can extend upwards from the top of the ultrasonic nozzle, and when the droplets leave the atomizing surface of the nozzle, they are decomposed into a uniform fine mist of micrometer sized droplets.

Unlike pressure nozzles, ultrasonic nozzles do not use high pressure to force liquid through a small hole to produce spray. The liquid enters through a relatively large nozzle center without pressure and is atomized by ultrasonic vibration inside the nozzle.

Each ultrasonic nozzle operates at a specific resonant frequency, which determines the median size of the droplet. The difference in droplet size is very small, and its distribution can be accurately predicted within a certain range through mathematical calculations. For example, a 120 kHz nozzle produces a median droplet size of 18 microns when spraying water. The higher the frequency, the smaller the decrease in median value.