Lechler hollow cone nozzles produce an especially fine, atomized liquid flow, with spray patterns characterized by a ring-shaped impact area. These nozzles are ideal for spray applications such as gas cooling, aerating, dust control, and spray drying. All other factors being equal, hollow cone nozzles produce the smallest average droplet sizes of any purely hydraulic nozzle. In so doing, these nozzles create sprays with a greater exposed total surface or contact area than other hydraulic model. It is this increased contact area of the sprayed fluid upon its target that makes a hollow cone nozzle ideal for certain applications as listed above. The smaller droplets so created tend to be quite similar in size and relatively evenly distributed throughout the area of the spray.
Lechler offers two styles of hollow cone nozzles
Axial hollow cone nozzles
Lechler axial hollow cone nozzles have a straight-through flow line from input to output. They employ spiral grooves or inclined channels along that axis to produce swirl and atomization. The result is a spray comprising extremely small droplets that are similar in shape and size. The spiral grooves in the swirl inserts ensure an efficient whirling of the liquid. Consequently, the total contact surface area of the atomized liquid is significantly increased, the better to achieve the purpose of the spray application, such as faster evaporation or greater liquid contact with the target.
Tangential hollow cone nozzles
Lechler tangential hollow cone nozzles utilize a right angle supply of liquid to the target. Flow movement and atomization are achieved via a swirl chamber, without the use of a swirl insert, for maximum resistance to clogging
Tangential hollow cone nozzles also create a very uniform hollow cone spray. This is due to the right-angle flow the fluid takes inside the nozzle body. An off-center inlet combines with the 90° turn the fluid makes to generate a whirling rotation of the liquid within the nozzle chamber, ultimately resulting in smaller droplets and a consistent distribution upon discharge. With tangential hollow cones, spray angles up to 130° can be achieved. Due to their insert-free interiors, tangential hollow cone nozzles are basically self-cleaning and resistant to clogging, even with rather poor water conditions. Typical applications for tangential hollow cone nozzles include: air humidification in air conditioning systems, spray pond cooling, cooling of plastic pipes after extrusion, and gas cleaning in chemical and environmental engineering installations.