EXAIR‘s line of Adjustable and Super Air Amplifiers are the ideal solution for cooling hot parts. Using a small amount of compressed air, they’re designed to entrain massive amounts of free ambient air from the environment. This free air mixes with the primary air stream, achieving entrainment ratios of up to 25:1!
To demonstrate the dramatic difference between the Super Air Amplifier and a standard fan, I created a side-by-side video of the two. Using the 2″ Model 120022 Super Air Amplifier at just 40 PSIG (9 SCFM air consumption) check out just how effective we were at cooling down a stainless steel block:
When fast cooling of a hot part is necessary, look no further than EXAIR’s Adjustable and Super Air Amplifiers. They’re all in stock and can ship same day to the US & Canada with an order placed by 3:00 ET!
Many times EXAIR products are used to help sort materials based on their weight or their density by providing a consistent force against a series of targets that should be of the same density or weight, but when they are not, the airflow can be “tuned” to remove the non-conforming parts.
In this case, our customer (a packaging automation specialist) was working with a form fill and seal machine that was dedicated to making pouches 2” x 8” and filling them with a food product. In some cases, the pouches would not become filled with product and needed to be removed from the line. So, our customer devised a way to mount model 6042 2” Adjustable Air Amplifier along-side the travel of the pouches and set the input pressure and air gap setting to get optimum vacuum capture velocity to suck away empty ones and leave the full ones in-tact. Above you can see a photo that the customer took while mocking up the application at their facility. You can see the hose connected to the output to direct the empty pouches to a wire basket below.
A couple of things in this application made use of the Adjustable Air Amplifier the best choice. The first was the funnel-shaped suction area on the back side of the Adjustable Air Amplifier. This optimizes the Air Amplifier’s ability to draw in ambient air to propel it to the outlet. In doing this the un-filled, light-weight, plastic pouch becomes caught in the high velocity stream and thus gets carried away as desired. The second thing is that since compressed air is the source of power, the customer has infinite adjustability over the amount of suction force that they can apply to the pouch in the application. They can adjust the air gap opening on the Adjustable Air Amplifier to have a coarse adjustment of air consumption as well as vacuum level. Then, they have a finer adjustment that a pressure regulator can provide to really dial in the suction force as they need it to be for removal of the empties.
The idea here is that while Air Amplifiers are generally used for their output flow to cool targets and provide a significant Blowoff force, they can also be used to draw in not only smoke and fumes but also other lightweight items like the empty pouches above.
If you have a need to set up any kind of sorting process, maybe just to separate two different recycling streams or perhaps it is a need to perform a quality control function as shown above, think about EXAIR and our many solutions in this area.
Air entrainment is a term that we bring up quite often here at EXAIR. It’s this concept that allows many of our products to dramatically reduce compressed air consumption. The energy costs associated with producing compressed air make it an expensive utility for manufacturers. Utilizing engineered compressed air products that will entrain ambient air from the environment allow you to reduce the compressed air consumption without sacrificing force or flow.
Products such as the Super Air Knife, Super Air Nozzle, Air Amplifier, and Super Air Wipe all take advantage of “free” air that is entrained into the primary supplied airstream. This air entrainment occurs due to what is known as the Coanda effect. Named after renowned Romanian physicist, Henri Coanda, the Coanda effect is used in the design of airplane wings to produce lift. As air comes across the convex surface on the top, it slows down creating a higher pressure on the underside of the wing. This creates lift and is what allows an airplane to fly.
This is also the same principle which is allowing us to entrain ambient air. As the compressed air is ejected through a small orifice, a low-pressure area is created that draws in additional air. Our products are engineered to maximize this entrained air, creating greater force and flow without additional compressed air. Super Air Amplifiers and Super Air Nozzles are capable of up to a 25:1 air entrainment ratio, with just 1 part being the supplied air and up to 25 times entrained air for free!! The greatest air entrainment is achieved with the Super Air Knife at an incredible ratio of 40:1!
This air entrainment principle allows you to utilize any of these products efficiently for a wide variety of cooling, drying, cleaning, or general blowoff applications. In addition to reducing your compressed air consumption, replacing inefficient devices with engineered products will also dramatically lower your sound level in the plant. Sound level in some applications can even be reduced down to a point that would eliminate the need for hearing protection with the OSHA maximum allowable exposure limits set at 90 dBA for an 8-hour shift.
If you have inefficient blowoff devices in your facility, give us a call. An Application Engineer will be happy to help you select a product that will “quietly” reduce your compressed air consumption!
As Application Engineers, we help many customers with finding solutions with effective, safe, and efficient EXAIR products. But, in some instances, we get a request for an air amplifier to increase line pressures. EXAIR does not manufacture this type of Air Amplifier. In doing some research on the internet, I was able to find two different types of air amplifiers. In this blog, I will describe the difference between the pressure-type and volume-type.
The EXAIR Super Air Amplifiers are defined as a volume-type of an amplifier. They use compressed air to generate a large volume of air flow. The amplification ratio is the comparison between the inlet air flow and the outlet air flow. With the EXAIR Super Air Amplifiers, we can reach an amplification ratio of 25 to 1. They use a Coanda profile with a patented shim to create a low pressure to draw in a large volume of the surrounding air. EXAIR manufactures a variety of different sizes, materials, and types. But they all do the same thing, amplify the volume of air. To give an example, model 120024 Super Air Amplifier has a 25:1 amplification ratio. It uses 29.2 SCFM (826 SLPM) of compressed air at 80 PSIG (5.5 bar). So, the outlet air flow is amplified from 29.2 SCFM to 730 SCFM (20,659 SLPM) of air. This large volume of air works great for cooling, exhausting, and transferring. But, with any type of amplification, you have to lose something. With the volume type Air Amplifiers, the outlet pressure is reduced dramatically.
The pressure-type air amplifiers are different from the Super Air Amplifiers as this device will amplify the outlet air pressure, not the volume. It is an air pump that has a direct dual piston that uses two different diameters. The larger diameter uses the drive inlet pressure while the smaller diameter is used for the boost pressure. The amplification ratio is determined by the difference in volume from the drive piston to the boost piston. They also come in a variety of ranges and sizes. As an example, an amplification ratio of 15:1 will increase an inlet pressure from 100 PSI (7 bar) to an outlet pressure of 1,500 PSI (103 bar). Since the pressure-type air amplifier is an air pump, the system has to cycle. To do this, they use pilot valves to either add the inlet compressed air to the drive piston or to relieve the air pressure from the drive piston. This cycling portion of the operation does reduce the efficiency of the air amplifier. The pressure-type air amplifiers are used to generate high pressure for a specific application or area and eliminate the purchase of a high-pressure air compressor. The applications include air clamps and presses, pressure testing, air brakes, and also blow molding. Like stated above about losing something with amplifications, the volume of air is reduced dramatically. Generally, a reservoir tank and over-sizing will be needed for a good system.
The Application Engineers at EXAIR enjoy talking to customers about compressed air applications. If you need more information about Air Amplifiers, you can contact us directly. We can explain the volume-type that we manufacture or refer you to a company that makes the pressure-type. Either way, we will be happy to hear from you.
The EXAIR Super Air Amplifiers and Adjustable Air Amplifiers are used in 100’s if not 1000’s of applications and locations across the world. For cooling, drying, and cleaning of parts as well as venting and exhausting of smokes and fumes, or dust collection – the Air Amplifiers are sure to get the job done.
The Super Air Amplifiers are made of aluminum and are sized from 3/4″ to 8″ to cover a wide range of applications. Compact and lightweight, no electricity, no moving parts, and instant on/off are just a few of the features.
The Adjustable Air Amplifiers are made of aluminum or type 303 stainless steel and are sized from 3/4″ to 4″, and with adjustable output, provide a wide spectrum of performance. They have the same great features of the Super Air Amplifier with the added benefit of varying force and flow.
2″ Super Air Amplifier and 2″ Stainless Steel Adjustable Air Amplifier
Even with the wide variety of types, sizes, and materials of construction, a customer may have a special need and there are numerous ways that EXAIR can customize the Air Amplifiers. I’ll touch on several from the basics to the most complex.
The Super Air Amplifiers come with a stock shim that sets the performance seen in the catalog. There are other shim thicknesses available if more or less flow is preferred, and they can be installed at the factory if desired.
The Adjustable Air Amplifiers are designed for varying output by turning the plug further in to or out of the body. If there is a performance setting that is preferred, we can test, adjust and set it to meet that performance, allowing to be installed and ready for optimum results.
If the use of a special material will increase the benefit of the Air Amplifier, we can explore several options with you. One customer needed an Adjustable Air Amplifier with a PTFE plug to help draw a sticky material through a process and prevent the material from adhering to the surface of the Air Amplifier.
For those applications where the Air Amplifier is to be installed into a piping system, custom design with flanged ends can be done. Recent designs include stainless steel Adjustable Air Amplifiers with class 150 raised face flanges, and another with sanitary Tri-Clamp style.
Adjustable Air Amplifier with PTFE Plug, Class 150 Raised Face and Sanitary Tri-Clamp Flanges
A special High Temperature version was developed for moving hot air to surfaces requiring uniform heating while in a furnace or oven. This special design is rated for environments up to 700°F and its surface is protected from heat stress by a mil-spec coating process. This special High Temperature Air Air Amplifier was so popular, it became a standard offering and is in stock!
1-1/4″ High Temperature Air Amplifier
For over 35 years, EXAIR has been designing and manufacturing the best performing and highest quality products in the marketplace. If you have a special requirement and in need of a custom solution, we’ve got the experience and history to solve most problems.
If you have questions about Air Amplifiers, custom Air Amplifiers, or any of the 15 different EXAIR Intelligent Compressed Air® Product lines, feel free to contact EXAIR and myself or any of our Application Engineers can help you determine the best solution.
In general, the air amplifiers employ the Coanda effect – a basic principle of fluid flow – to create air motion in their surrounding. Through intelligent design, this surrounding fluid flow can be manipulated and exploited, creating an amplification of a small amount of compressed air.
How do they work? In the figure below – a small amount of compressed air flows into the unit (1) to an annular chamber (2). The air is then throttled through a small ring nozzle (3) at high velocity. This primary air stream adheres to the Coanda profile (4), which directs it towards the outlet. A low pressure area is created at the center (5), inducing a high volume flow of the surrounding air into the primary stream. At the exit, you have the combination of flows, resulting in a high volume, high velocity flow.
The amplification ratio – the outlet airflow compared to the compressed air flow is dependent upon the cross sectional area of the inlet, and the 3/4″ Super Air Amplifiers have 12:1 amplification ratios all the way up to the 4″ and 8″ Super Air Amplifiers with 25:1 amplification ratios! That is a lot of ‘free air’ to use for cooling, drying and cleaning. And a lot of air or smoke that can be drawn at the inlet and vented away from the area. For more on the amplification ratios, see this -blog-
Each Super Air Amplifier has a patented shim (patent#5402938) that precisely sets the compressed air flow, and shim sets are available to install to increase the force and flow as needed.
The balanced outflow of air minimizes wind shear to produce a very quiet, powerful flow at sound levels up to three (3) times quieter than other air movers. A 4″ Super Air Amplifier operated at 80 PSIG will have a Sound Level of just 73 dBA.
The video below shows the power of the Super Air Amplifier in inducing a high volume flow of surrounding air (for venting) into the primary air stream (for cooling/drying/cleaning)
Typical applications include venting weld smoke, cooling hot parts, drying wet parts, cleaning machined parts, distributing heat in mold & ovens, dust collection, and exhausting vent fumes.
If you have questions about the Super Air Amplifier or any of the 16 different EXAIR Intelligent Compressed Air® Product lines, feel free to contact EXAIR and myself or any of our Application Engineers can help you determine the best solution.
Henri Coanda was a Romanian aeronautical engineer best known for his work on the fluid dynamic principle with his namesake, the Coanda effect. Before this, Henri patented what he labeled as a jet engine.
Henri’s patent (French patent No. 416,54, dated October 22, 1910) gives more information into how he envisioned the motor working. When air entered the front, it passed through different cavities that caused the air stream to first contract and then expand. In Henri’s opinion this contraction and expansion converted the air’s kinetic energy into potential energy. The air ultimately was channeled to a diffuser where it was discharged.
Henri stated that the efficiency of this engine could be improved by heating the air in the cavities, Henri’s logic was that this would increase the pressure of the air passing through.
What is obviously lacking in the patent (including identical ones taken out in England and the United States) is any mention of injecting fuel, which in a true jet engine would combust with the incoming air. Judging only by Henri’s patent, it was little more than a large ducted fan and it could not have flown. Throughout Henri’s career he changed his story many times on whether this plane actually flew or not.
Not to cast too much shade on Henri’s accomplishments he did discover the Coanda effect. The Coanda effect states that a fluid will adhere to the surface of a curved shape that it is flowing over. One might think that a stream of fluid would continue in a straight line as it flows over a surface, however the opposite is true. A moving stream of fluid will follow the curvature of the surface it is flowing over and not continue in a straight line. This effect is what causes an airplane wing to produce lift, and enhance lift when the ailerons are extended while at lower air speeds such as occurs during takeoff and landing.
EXAIR uses the Coanda effect to offer you highly engineered, intelligent and very efficient compressed air products. Our designs take a small amount of compressed air and actually entrain the surrounding ambient air with the high velocity exiting compressed air stream to amplify the volume of air hitting a surface.
When you are looking for expert advice on safe, quiet and efficient point of use compressed air products give us a call. We would enjoy hearing from you.