Comparative differences between Oblan Precleaners and competitors. Oblan Dynamic Air Precleaners are devices which separate solid impurities from the air stream before they reach the main filters. They are usually installed in place of the rain cap, dust bowl, or aspirated precleaner (exhaust system). In some applications, they can be mounted directly to the air cleaner. Air enters the system through a pre-screen that removes large debris. It then flows through static vanes causing the air to spin. As the air spins, centrifugal force separates dust, dirt, insects, rain and snow from the air stream. The swirling air drives a high velocity rotor that acts as a blower evacuating contaminants through special discharge ports at the bottom or in the side of the unit. Only purified air flows to the air filter elements.
Comparative differences with Other Dynamic Air Precleaners Oblan Dynamic Engine Air Precleaners Other Dynamic Engine Air Precleaners One piece rust-proof rotor, made of polipropylene with addition of rubber, which gives an excellent strength to impact even at low temperatures. As it is a one piece unit, it won't dismantle or become unbalanced during operation. Compound rotor: plastic core, iron wire rays and ladle type metal blades welded to the rays. If there is any welding failure or corrosion problem in the blades, the rotor could lose a blade and may become unbalanced, resulting in rotor destruction. The rotor is mounted on dual ball bearings over double welded plate steel (not hanging from the precleaner body). This design gives high stability to the rotor even at maximum rpm. The rotor is hanging from the precleaner body. If the body suffers knocks, vibrations or mechanical distortions it is possible to have interference between the rotor blades and the static vanes, causing the rotor to stop. The rotor blade area is differential, it decreases to the centre. This design guarantees that the air entering into the precleaner will produce the enough rotor speed to eliminate the impurities even at low engine rpm. The rotor blade area is ladle type at the ends but it doesn't have section against the air flow in the middle portion of the blade. For this reason the rotor doesn't generate enough speed to centrifugate the impurities when the engine is running at low rpm. Oblan Dynamic Engine Air Precleaners Other Dynamic Engine Air Precleaners Double-welded plate steel that gives maximum strength to material fatigue caused by vibrations, avoiding breaks in the junction between the precleaner plate and the outlet pipe to filter housing. Simple-welded plate steel that doesn't give an optimum structural strength to the precleaner. Specially designed discharge ports with a bigger and uniform area. This avoids obstructions and guarantees a maximum precleaner efficiency during its working life. Wedge shape discharge ports. Large particles can obstruct the discharge ports decreasing precleaner efficiency or even cause it to stop functioning The perforated metal pre-screen at the inlet has the same diameter than the precleaner external body. In this way it has a larger inlet surface and less restriction to the airflow. The screen holes are circular shape with special arrangement and small diameter, giving a big inlet total surface and avoiding larger contaminants to enter. The perforated metal pre-screen at the inlet has the diameter of the static vanes body. So the inlet surface is quite small and could be obstructed by large contaminants, especially in harvester machines. The screen holes are rhomb shape or circular shape with big diameter, so larger contaminants could enter the precleaner and then plug exhaust port areas. Oblan has 3 different lines of dynamic air precleaners with more than 28 standard models, giving the better choice for each application. Limited quantity of models and options. Oblan Dynamic Engine Air Precleaners Other Dynamic Engine Air Precleaners The precleaner outlet tube is provided in different diameters. This outlet tube can be also adapted with the supplied reducing sleeves for a variety of outlet choices. Due to the exclusive discharge ports design the eliminated particles can't be recirculated by the precleaner. Limited variety of coupling diameters. In stationary engines and slow-moving machinery some models present a high recirculation percentage of particles already eliminated by the air precleaner. Available application airflows from 18 to 1411 CFM (0.5 to 40 m3 /min.). For larger airflows precleaners can be installed in parallel. They are steel made by stamping and welding with an excellent mechanical strength. Precleaners are powder coated for a durable, corrosion resistant finish. More limited application airflows: 50 to 1100 CFM (1.5 to 30 m3 /min) in general. Some of them are plastic made with low mechanical strength and not resistant to climate effects (U.V. rays and rain). Comparative differences with Dust Bowl Air Precleaners Oblan Dynamic Engine Air Precleaners Dustbowl Engine Air Precleaners Requires no maintenance Requires 30 to 45 minutes of maintenace a week They are steel made by stamping and welding with an excelent mechanical strength. Precleaners are powder coated for a durable, corrosion resistant finish. They are resistant to climate effects (U.V. rays and rain). They are usually plastic made, and suffer the effects of climate (material degradation). These static precleaners are frequently damaged by knocks, by over-fastening the bolt after maintenance or by temperature differences. They can be mounted in the up-right or in horizontal position depending the preclener model and application. They must be mounted only in the up-right position in order to acumulate the dust and other contaminants. Oblan dynamic precleaners work efficiently with all kinds of solid particles, whether heavy or light. Dust Bowl precleaners work efficiently only with heavy solid particles collecting dust, dirt, insects, rain and snow. However they are ineffective with light or fine particles. These particles include dust, dirt, insects, rain, snow, etc. Precleaner efficiency remains constant every time. Precleaner efficiency is variable (it decreases as the bowl starts to fill up and it is low for low engine rpm). It is a system that combines a static vanes body and a dynamic body (rotor). It removes up to 90% of impurities from intake air before the air enters the filter elements. It is a centrifugal system with a static vanes body only. Due to this the precleaner efficiency is much lower than a dynamic system such as Oblan.
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