ULTRA SONIC NOZZLE | electrically actuated spray nozzles

Ultrasonic nozzles operate by converting high frequency sound waves into mechanical energy that is transferred into a liquid, creating standing waves. As the liquid exits the atomizing surface of the nozzle, it is broken into a fine mist of uniform micron sized droplets. These nozzles are also known as Electrically actuated / controlled Spray Nozzles.

The electric hydro pulse nozzle has an integrated solenoid valve to rapidly regulate the on-off cycle of the nozzle. The solenoid valve is positioned inside the nozzle so that it is very close to the orifice. This means the reaction time of the shut off system is incredibly fast. The nozzle can be cycled off and on up to 150 times per second. Its used for precision spraying applications like tablet coating.

DETAILS 

Every ultrasonic nozzle operates at a specific resonant frequency, which dictates the median droplet size. Droplet sizes have little variance, and can be mathematically calculated to fall within a tight predicted drop distribution. For example, a 120 kHz nozzle produces a median drop size of 18 microns (when spraying water). The higher the frequency, the smaller the median drop size.

Nozzles are fabricated from a very high-strength titanium alloy and other proprietary metals, making them exceptionally resistant to chemical attack and providing superior acoustical properties. The electrically active elements are contained within a sealed housing that protects the nozzle components from external contamination.

Variable flows (pulse width modulation)
With such fast and reactive on/off cycle times the Electric Hydropulse can achieve vary the flow from the nozzle without varying the fluid pressure. This is achieved by pulsing the nozzle very rapidly, (pulse width modulation – PWM). So, for example, a half flow could be achieved by having a 0.05 second on to 0.05 second off cycle time. This would halve the overall flow rate at any given pressure. Because the on-off cycle is so fast the resulting spray remains very evenly distributed even when targeting fast-moving conveyors.

With a normal hydraulic nozzle flow rates could only be controlled by varying the fluid pressure. This, however, will alter other important spray characteristics such as droplet size. When variable flow rates are required due to, say, different product lines, it might not be possible to achieve the required variance with a hydraulic nozzle. This would mean a nozzle change between production runs. The HydroPulse Electric will mean the same nozzles can be used despite variable dosing requirements.

Additionally, rapid pulse modulation allows for lower flow rates to be achieved when compared to traditional hydraulic nozzles. This can be important in some very low flow rate applications.

Benefits
Control a wide range of flow rates
Guarantee an even and uniform application rate that connects with conveyor line for automated speed adjustments
Reduce consumption of expensive coatings
Reduce overspray waste and improve product quality
Exact target coatings secure a clean and safe environment
Promote increased production
Reduce maintenance and downtime
Reliable spray dosing.

Applications
Application of antimicrobial agents for food safety
Application of preservatives and mold inhibitors to help extend shelf life
Application of egg wash
Coat bottles to minimize scuff damage
Apply water to balance moisture loss from the freezing process
Apply coatings and release agents to pans, cookie sheets, and conveyors to prevent sticking
Apply flavorings, oil, and butter to enhance the appearance and improve the taste of products
Apply viscous coatings like syrups, glazes, and chocolate

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