EXAIR Air Jets: Overview

Air Jet Family

EXAIR manufactures a variety of Air Nozzles and Jets to safely, efficiently and effectively blow compressed air. There are many different styles that can best fit specific applications. In this blog, I am going to discuss the EXAIR Air Jets. They are designed to entrain a high volume of ambient air to give a moderate blowing force. Similar to the Air Amplifiers, these miniature devices use very little compressed air to achieve an effective blowing for removing debris, drying parts, or cooling hot products. EXAIR manufactures two different styles, the High Velocity Air Jet and the Adjustable Air Jet.

The Air Jets use a Coanda profile for blowing. The Coanda effect was named after a Romanian aerodynamic pioneer, Henri Coanda who discovered a fluid flow phenomenon. He stated that “a jet of fluid emerging from an orifice to follow an adjacent flat or curved surface and to entrain fluid from the surroundings so that a region of lower pressure develops” (1). Since air is a fluid, it will react in the same manner. The EXAIR Air Jets create a high velocity air stream along an engineered profile. So, as the air “hugs” the profile, a low pressure is created which will draw in ambient air. The unique design of the Air Jet utilizes a ring jet of compressed air to produce that low pressure at the entrance, entraining the surrounding ambient air. This makes the Air Jet very efficient as it utilizes more ambient air than compressed air.

Depending on the environment or application, the Air Jets come in two types of material; brass and stainless steel. The High Velocity Air Jets use a shim to set a gap. The gap can be changed by installing a different thickness of shim to increase or decrease the blowing intensity. These shims in conjunction with a regulator gives versatility for a wide range of applications. If the desired blowing force needs to be changed for different types of products or flexibility is required “on the fly”, the Adjustable Air Jet would be recommended. It has a micrometer gap indicator to set the desired result. By twisting the plug of the Adjustable Air Jet, you can get output flows from a gentle breeze to a blast. What makes both Air Jets unique is the design. They meet the OSHA standard for noise level and dead-end pressure. If you block the output of the Air Jets, the pressure will not exceed the OSHA safety requirement for dead-end pressure. Also, the inlet and/or outlet can both be ducted for remote positioning.

Model 6013 High Velocity Air Jets help dry an engine casting

Our accessories can make the Air Jets easier to use.   We have Stay Set Hoses for easy connections and maneuverability. The Stay Set Hoses come in a variety of lengths from 6” (152mm) to 36” (915mm) and once you set the position, the Stay Set Hose will keep the Air Jet stationary even during blowing. You can add a Magnetic Base with the Stay Set Hose and Air Jet to mount the blowing unit right to a metal fixture. It has a 100 lb. (45.5Kg) pulling force to keep the Air Jet from moving until you need to move it. The bases come with a ¼ turn shut-off valve and in a single or dual output configuration. In addition to the above accessories, we also offer a model 9040 Foot Pedal valve for operator control of the duration of blowing with their foot, allowing the use both of their hands.

With the cost to make the compressed air utility being so high, it is important to use it as efficiently as possible. The High Velocity Air Jet and Adjustable Air Jet have the ability to give you effective blowing for removing debris, drying parts, or cooling objects without using a large amount of compressed air. With the accessory items included, you can set up an improved blowing station that will be effective, quiet, and efficient for your operators. The Air Jets are flexible and adaptable to be used in numerous types of blowing applications. If you have any questions about the Air Jets or if you would like to discuss any applications, you can contact an Application Engineer at EXAIR.

John Ball, Application Engineer
Email: johnball@exair.com
Twitter: @EXAIR_jb

 

(1) Note: Coanda effect by Wikipedia.org

EXAIR’s Super Air Knife Performs Well at Low Cost for Blowoff

There are many ways to blowoff, cool, and/or dry materials.  A few of these methods are the drilled pipe, an array of flat nozzles, using a blower driven air knife and the EXAIR Super Air Knife.  We’ll examine each in further detail, for blowoff of water after a bottling cleaning operation.  Testing was done at 60 PSIG of supply pressure.  The blower utilized a 10 hp motor and was a centrifugal type spinning at 18,000 RPM.  Sound levels were taken with product not present to test the sound of each of the blowoff types.

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pipe-black (2)Drilled pipe is a common blowoff because it is very inexpensive and easy to make.  But drilled pipe performs poorly.  The low cost to make the drilled pipe is quickly outpaced by the inefficiency and high compressed air costs.  The holes are easily blocked and the noise level is excessive, both of which violate OSHA requirements.  Also, the air pattern across the length can be very inconsistent, with areas of low flow and areas of turbulent flow.

flatnozzle (2)Flat air nozzles installed along a length of pipe is another inexpensive option, but it can be a poor performer.  The flat nozzles are available in many materials, from many manufacturers.  The flat nozzles do offer some efficiencies, but similar to drilled pipe, the operating costs and noise levels are high. Air pattern across the length can be inconsistent with areas of high and low flows, leading to incomplete drying or cooling. Also, many of these nozzles are made from plastic material which breaks or cracks when it it hit which causes additional expense and maintenance to replace broken nozzles.

blower (2)A blower air knife can prove to be an expensive and noisy option.  Typically, the initial purchase price is high.  Operating costs are lower than the drilled pipe and flat nozzles and in line with the Super Air Knives.  The blowers can be very large and space for two 3″ diameter hoses requires extra mounting space compared to low profile other options. Noise levels are high, at 90 dBA.  Annual costs for bearing and filter maintenance can be significant.

gh_SAK_750x696EXAIR Super Air Knives performed exceptionally well in removing the water in one pass due to the strong, laminar flow of air.  Sound level was low at just 69 dBA, well within OSHA requirements for an hour 8 hour exposure time. Safe operation is assured, as the Super Air Knife design cannot be dead-ended.  Maintenance costs are low, as the Super Air Knife has no moving parts to breakdown or wear out.

Air-Knife-Blowoff-Comparison
** A pair of 12″ Super Air Knives was used for this comparison

Ultimately, the Super Air Knife is a low cost way to blowoff, dry, clean and cool.

If you have questions about Super Air Knives, or would like to talk about any EXAIR Intelligent Compressed Air® Product, feel free to contact EXAIR and myself or one of our Application Engineers can help you determine the best solution.

Brian Bergmann
Application Engineer

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EXAIR Back Blow Nozzle: An Overview

In certain applications such as blowing chips or debris out of a pipe or blind hole, it may not be possible to blow forward. The pipe may be too long, making it impossible to push the debris all the way down the pipe or the other end of the pipe may not be open. In either of these scenarios, the Back Blow Nozzle is the right tool for the job. An array of holes around the diameter of the Back Blow Nozzles provides a powerful 360° airflow pattern that will clear out any leftover coolant or chips from the machining process.

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Small 1004SS easily clears debris

EXAIR has three different size Back Blow Nozzles; the 1004SS (M4 x .5), the 1006SS (1/4 NPT), and the 1008SS (1” NPT). The 1004SS is recommended for use on pipes as small as ¼” and up to 1”. The 1006SS can be used for a wide range of pipe sizes, from 7/8” up to 4”. The 1008SS nozzle offers the greatest overall force for stubborn or sticky materials stuck to the inside diameter of the pipe. This nozzle is suitable for use in pipes ranging from 2”-16”. As the Back Blow Nozzle will be blowing chips and debris back out of the pipe towards the operator, it is always recommended that a Chip Shield is used. The strong polycarbonate Chip Shield will keep them safe from flying debris and keep you in compliance with OSHA directive 1910.242(b). For visual representation of the performance of the Back Blow Nozzle, take a look at this short video clip that demonstrates its use.

All of EXAIR’s Back Blow Nozzles are available with extensions. For the 1004SS we have extensions from 6”-36”, and from 12”-72” for the 1006SS and 1008SS. The Back Blow Nozzle can also be installed on our VariBlast, Soft Grip, Heavy Duty, and Super Blast Safety Air Guns. With such a wide range of available sizes and configurations, we can tackle just about any internal pipe cleaning application. If you have a process in your facility that may benefit from the use of one of these nozzles, give us a call and get one on order today!

Tyler Daniel
Application Engineer
E-mail: TylerDaniel@exair.com
Twitter: @EXAIR_TD

 

EXAIR Cold Guns Provide Fast Cool Down on a Soldering Process

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Two High Power Cold Guns Mounted Outside the Soldering Machine

One of our clients who produces automated test and assembly equipment for the automotive parts industry contacted me recently with a problem. Their recent project was an automated soldering station. The machine was designed to solder wire leads onto contacts for a motor assembly. The machine worked well at reasonably slow paces. However, when they made efforts to speed up the cycle time, they found they needed to put more heat into the part in a shorter duration of time in order to achieve the desired result for the solder joint. The problem that resulted was the soldering process was imparting too much heat into the connector assembly.

After reviewing the application with our customer, we determined there were two points within the machine that needed to be cooled during each cycle in order to keep the heat from building up in the parts. Given the high heat condition and the short available time for cooling, we opted to go for two of the High Power Cold Guns to blast the part immediately after the heating process for soldering took place. Before the High Power Cold Gun solution was applied, the assembly was climbing to 150C which did not bode well for longevity of the connected components. After the installation of the High Power Cold Guns, the customer was able to have a respectable 30C finishing temperature on the parts before they exited the machine.

The quality issue was more than handled by the cooling capability of the High Power Cold Guns which allowed the customer to continue with their plan to increase productivity with the machine without having any adverse effect due to heat penetrating into the parts. The High Power Cold Guns were controlled by way of solenoid valves to produce the cooling power instantly only at the end of the cycle.

Do you have an automatic or semi-automatic process that could benefit from localized cooling similar to this example? If so, EXAIR has a whole range of Vortex Tube and Spot Cooling Products that can be adjusted to fit your need within the application.

Neal Raker, International Sales Manager
Email: nealraker@exair.com
Twitter: @EXAIR_NR