EXAIR’s Engineered Air Nozzles and Air Jets provide a superior solution to minimize compressed air usage and reduce noise levels for compressed air blow-off operations.
Air Nozzles and Jets – when compared to commonly used open copper tubes or pipes the compressed air savings can be as high as 80%. With less compressed air, sound levels are greatly reduced. A 10 dBA noise level reduction is typical. All EXAIRAir Nozzles and Jets meet OSHA guidelines for dead end pressure and sound level exposure standards.
EXAIR Nozzles and Jets are designed and manufactured to take advantage of the Coanda (wall attachment of a high velocity fluid) effect which can amplify the airflow up to 25 times. The compressed air exits through the small holes on the nozzle which entrains the surrounding air. The effect from this is a high volume, high velocity blast using less compressed air. EXAIR manufactures many sizes and styles of air nozzles from the smallest, but quite powerful M4 x 0.5 thread Atto Super Air Nozzles to our largest 1-1/4 NPT Super Air Nozzle. We also offer Flat Super Air Nozzles, and the Back Blow style nozzle for cleaning out tubes, pipes, channels or holes from 1/4″ to 16″ in diameter.
The Air Jets are 1/8 NPT threads and blow air out at a right angle from the inlet. They produce a vacuum on the larger diameter side which pulls in surrounding ambient air into the total output flow. Air Jets are available in brass or Type 303 stainless steel. You can choose from a fixed flow style or an adjustable flow style to provide flexibility for your applications. The adjustable flow models have a clear micrometer air gap indicator to assure consistent and accurate results.
All of our Air Nozzles and Jets are engineered to meet or exceed OSHA Standard 1910.24(b) for 30 PSIG dead end pressure, they cannot be dead-ended as there is always a route for the air to escape. In addition, our products are going to meet the OSHA Standard CFR 29 – 1910.95(a) for allowable noise exposure levels.
EXAIR’sSwivel Fittings make it easy to adjust the position of the Air Nozzles and Air Jets. The fittings allow for movement of 25° form the center axis for a total movement of 50°. There are nine different models available and all of them are made from stainless steel
If you would like to discuss blow off, noise levels, dead end pressure or any of EXAIR’s Intelligent Compressed Air® usage solutions, I would enjoy hearing from you…give me a call.
A manufacturing plant was using extruded aluminum structural framing for making benches. After the aluminum parts were cut, they had coolant and chips inside the tube. They tried to run a rag through the center to remove the material, but it wasn’t able to get into all the crevices and before long the rag was saturated. Also, they noticed that the chips would scratch the internal surfaces. For this company, quality was very important to represent their brand. So, they were needing a non-contact way to clean the inside of these parts after sawing. They contacted EXAIR as we share the same business facets of first-class customer service and great quality.
At EXAIR, we design and manufacture nozzles for just this type of operation; the Back Blow Air Nozzles. We offer three different sizes to fit inside a wide variety of diameters from ¼” (6.3mm) to 16” (406mm). They are designed to clean tubing, pipes, hoses, channels, and extruded “odd” shapes. The 360o rear airflow pattern can “wipe” without touching the internal surface to remove coolant and chips. For the application above, I recommended the model 1006SS Back Blow Air Nozzle to fit inside the 1 ½” (38mm) opening. The range for this Back Blow Air Nozzle is from 7/8” (22mm) to 4” (102mm) diameters. This 316SS robust nozzle would last a long time without having to change or replace cloth rags.
After installing the model 1006SS onto an extension pipe, the cleaning operation became very easy and efficient. After each cut, they would run the Back Blow Nozzle through the center with only one pass to clean. The non-contact wiping removed the coolant and chips without marring the internal surface. In addition, they were able to speed up their operation by 20%. Cleaner tubes, less time, cost savings; they were happy that they contacted EXAIR for our expertise.
If you need to clean the inside of tubes, hoses, pipes, etc., EXAIR has the perfect nozzle for you, the Back Blow Air Nozzles. EXAIR can also offer these nozzles on our VariBlast, Soft Grip, and Heavy Duty Air Guns for manual operations. They come with Chip Shields and extensions that can reach as far as 72” (1829mm). Or like the customer above, automate the system to get a great non-contact cleaning. If you require any more details, you can contact an Application Engineer at EXAIR. We will be happy to help you.
A common item that can be found in a majority of machine shops is the blue or gray knuckle-jointed hose used to dispense coolant on lathes and CNC machines. EXAIR also uses this same hose with our Cold Guns and Adjustable Spot Coolers for applications that cannot or do not wish to use liquid coolant as a means of keeping the heat down on their tooling. Since the cold air discharges at atmospheric pressure, this is an acceptable application.
Another application is using this style of hose as a compressed air blowoff. This is NOT a proper use of the hose and is not only a considerable waste of compressed air but can also pose a safety hazard. Using this method for compressed air blowoff is not compliant with OSHA 1910.242(b).
I was recently contacted by a customer in Indonesia that was using an array of (6) of these knuckle-jointed hoses with a ¼” round nozzle attachment for a blowoff operation. The customer had a series of rubber pads used in the construction of a toy castle. The pads were brought along by an overhead conveyor and a design was printed on the head of the pad.
The nozzles were used to dry the ink before the pad made it to the next part of the process. This was a new product line and the processes involved were being evaluated for potential places to save on compressed air rather than adding overall capacity to their system. After using a variety of EXAIR products for other blowoff applications, they came back for another engineered solution.
After testing both a 1009-9280 (Adjustable Air Nozzle w/ 30” Stay Set Hose) and an HP1126-9280 (1” High Power Flat Nozzle w/ 30” Stay Set Hose), the customer determined that the airflow pattern from the 1” Flat Nozzle was more conducive to drying the rubber pad and purchased the remaining units to replace their original method. The compressed air savings was noticed immediately!!
For the old operation, they had to regulate the pressure down on the hose to 25 psig so that the hose wouldn’t break apart. (1) This hose , with a ¼” round nozzle, will consume 52 scfm at 25 psig of supply pressure. With (6) of these they were consuming a whopping 312 scfm!! Since the HP1126 is compliant with OSHA directive 1910.242(b) and will not break apart at higher pressures, they were able to operate at 80 psig while only consuming 17.5 scfm. They saved more than enough air for their new process and are evaluating whether or not they can turn off one of their smaller 25 HP compressors.
The new setup with the EXAIR engineered solution was able to save them 207 scfm of compressed air. Assuming a cost of $.25/1000 scfm and a 40 hr work week, this translates to an overall savings of $6,458.40 per year off of their utility bill.
207 scfm x 60 minutes x 8 hrs/day x 5 shifts/week x 52 weeks/year =25,833,600 scf
25,833,600 scf x ($.25/1000 scf) = $6,458.40
If you’re using an inefficient compressed air blowoff in your facility, give us a call. An Application Engineer will be happy to evaluate your process and determine the safest and most efficient solution. With same day shipment for stock items on orders placed by 2:00 pm ET, we can get a solution out to you fast. And you can be saving money upon installation!
I had a customer wanting to reject a container off a conveyor belt. The container held yogurt, and when an optic detected a reject, they wanted to operate a solenoid to have a nozzle blow the container into a reject bin. They had a range that went from 4 oz. (113 grams) for the small containers to 27 oz (766 grams) for the large. He wanted me to suggest one nozzle for all sizes, as they would automatically regulate the pressure for the full range of products. In looking at the largest size, this container will need the most force to blow off the conveyor. The two factors that affects the force in this type of application is weight and friction. When it comes to friction, it is generally an unknown for customers. So, I was able to help with a couple of things to determine the friction force.
Friction is a dimensionless number that represents the resistance created between two surfaces. We have two types; static friction, ms, and kinetic friction, mk. Static friction is the maximum amount of resistance before the object begins to move or slide. Kinetic friction is the amount of resistance that is created when the object is moving or sliding. So, Static friction is always greater than kinetic friction, ms > mk. For this application, we will use an air nozzle to “shoot” horizontally to hit the rejected product.
Let’s take look at our customer’s application. We have a system to reject a non-conforming part with air. The conveyor has a urethane belt. The container is plastic. For the largest container, they have a weight of 27 oz. (766 grams). Being that the conveyor belt is only 12” (30.5 cm) wide, we can determine that if we get the part moving, it will continue off the belt and into the reject bin. The equation for the maximum amount of force required to move a container is below as Equation 1.
Fs = ms * W
Fs – Static Force in ounces (grams)
ms – Static Friction
W – Weight in ounces (grams)
One way to determine the amount of force is to use a scale similar to a fish scale. The scale should have a maximum indicator to help capture the maximum amount of force. You will have to place the object on the same belt material because different types of materials will create different static forces. Keep the scale perpendicular to the object, and slowly pull on the scale. Once the part begins to move, record the scale reading. For the exercise above, it showed 9.6 oz. (271 grams) of force to move the 27 oz. (766 gram) object.
Another way would be to calculate the static friction, ms. Static friction can be found by the angle at which an object starts to move. By placing the container on a section of supported urethane conveyor belt, you can lift one end until the object starts to slide. The height of the lift can be measured as an angle. As an example, we take 3 feet (0.9 meter) of supported urethane conveyor belt, and we lifted one end to a height of 1 foot (0.3 meters) before the 27 oz (766 gram) container moved. To determine static friction, it is the tangent of that angle that you lifted. With some right triangle trigonometry equations, we get an angle of 19.5o. Thus, ms = tanq or ms = tan(19.5o) = 0.354. If we plug this into Equation 1, we get the following:
Imperial UnitsSI Units
Fs = ms * W Fs = ms * W
= 0.354 * 27 oz. = 0.354 * 766 grams
= 9.6 oz. of force = 271 grams of force
Now that we have the static force, we want to be slightly higher than that. In looking at the force requirements that are published in the EXAIR catalog, it shows that the model 1126 1” Super Flat Air Nozzle has a 9.8 oz. (278 grams) of force at 80 PSIG (5.5 Bar). This force is measured at a 12” (30.5 cm) distance with a patented .015” (0.38mm) shim. So, this nozzle will be able to slide the largest container into the reject bin.
To expand on the benefits in using the EXAIR Flat Super Air Nozzles, the force can be changed easily with a regulator or with a Shim Set. This is a unique feature as most competitive flat nozzles do not allow you to do this. The patented shims control the force rating in a wide range with lower air consumption and lower noise levels; making them safe and efficient. So, if this manufacturer decided to produce other sizes in the future, then they could change the shim to target even larger containers. The flexibility of using the EXAIR Flat Super Air Nozzles allow you to increase or decrease the force by just removing two screws and changing the thickness of the shim inside. EXAIR does offer a pack of shims with different thicknesses which are called a Shim Set.
With air pressure or shim manipulation, the customer could use the same nozzle for the yogurt containers. If you have any applications that need products to be rejected quickly, an Application Engineers at EXAIR will be happy to help you with a solution.