Different compressed air nozzles are required depending on the application and ambient or operating conditions. With its wide range of air nozzles, Lechler offers the optimum nozzle solution for every task. The following criteria are helpful in selecting the right air nozzles.
Air is also discharged at a specific angle. However, this is not comparable with that of liquids.
Air expands when it is discharged from the nozzle orifice, which leads to the expansion of the jet. The spray angle is normally approx. 20°.
Conventional air nozzles:
Lechler multi-channel nozzle:
Exact calculation:
Figure to the left: Operating and standard flow rate at 298 K (+25° C).
Relationship between standard and operating flow rate at different pressures and constant temperatures.
The term „standard volume flow“ refers to a unit quantity of a gas based on a standard reference. These standard conditions are used in nozzle technology, process engineering and other areas to compare gases on the basis of quantity information. If reference is made to standard volume flows in relation to nozzle technology, Lechler always bases its values on DIN EN ISO 1343.
In contrast, the term „operating volume flow“ describes the volume of the corresponding gas under the actual operating/application conditions. Since these normally differ from the standard conditions, pressure and temperature must always be clearly defined. If an operating volume is delivered in a certain time, this results in the operating volume flow.
The output of gases (e.g. air) is fundamentally different to the output of liquids. Gases are compressible fluids, whereas liquids are considered as incompressible fluids. Gases can be supplied with practically all nozzles that can also be used for atomizing liquids. However, due to the compressibility and lower density of gases, gas jets cannot be formed in the same way as with liquids.
Gases tend to generate a significantly increased noise level under certain conditions (pressure and nozzle design). The development of multichannel nozzles with specially shaped nozzle orifices makes it possible to considerably reduce the turbulence in the nozzle that causes noise. In addition, this nozzle design increases blowing force while at the same time reducing air consumption. The speeds of gases can be very high under certain conditions. If a specific pressure difference is applied to a nozzle, speeds of approx. 320 m/s can often occur in the smallest cross section. This speed can even increase shortly after the gas leaves the nozzle.
The regulation (EC) No. 1935/2004: Regulation of the European Parliament for general safety requirements to all food and beverage contact materials.
OSHA (Occupational Safety and Health Administration): The US federal authority of accidents at work.