The impact force of a liquid jet on a surface plays an important role in cleaning technology. The ratio of the impact force (F) to the impact surface (A) is referred to as the Impact (I). It can be controlled via the following parameters:
Impact Surface and Spray Shape
The impact surface is the area where the droplet hits. The smaller the impact surface, the greater the impact values. Nozzles with high impact are, for example, solid stream nozzles and flat fan nozzles with a narrow spray angle.
The impact increases linearly with the connected pressure. If the pressure is doubled while maintaining the same flow rate, the impact is also doubled.
Increasing the flow rate by using a larger nozzle increases the impact, assuming that the other parameters (spray angle, pressure and medium) remain the same.
5. Spray Angle, Spraying Distance, Spray Behavior
Depending on the application, we supply single-fluid nozzles with spray angles from 0° (solid stream nozzles) to 360° (tank-cleaning nozzles). Gravity and air flows influence the spray pattern.
Depending on the version, Lechler single-fluid nozzles can spray the fluid as a hollow cone, solid stream or flat fan. The solid stream nozzle does not spray, but rather produces a closed spray pattern that hits at a concentrated point. The droplets only begin to break up after some distance. Twin-fluid nozzles have a narrow spray angle of approximately 20° due to the high speed at which the compressible medium exits. However, as the distance from the nozzle increases, the spray pattern becomes increasingly less sharply delineated. Twinfluid nozzles normally produce full cone or flat fan spray patterns.
6. Hygienic Design and Surface Quality
Equipment and components must be designed accordingly so they are easy to clean. Hygienic design prevents recesses and gaps that can harbor dirt, unfavorable flow areas (dead spaces) and sinks that hinder the run-off of fluids. At the same time, attention is paid to maintaining the least surface roughness possible, max. Ra 0.8 µm. Lechler supplies various nozzles and rotating cleaning nozzles that have been designed with these requirements in mind.
For many Lechler rotating cleaning nozzles we only use materials that comply with the regulations of the FDA (Food and Drug Administration). The series 573/583 rotating cleaning nozzles and the series 527/591 spray balls also meet the strict hygiene requirements in accordance with 3-A.