EXAIR manufactures a variety of Air Nozzles and Jets . Back Blow Air Nozzles can help reduce cost, clean hard to get to areas in small diameters, pipes, tubes, channels and holes. These nozzles are designed to remove debris from pipes, blind holes, and other areas where it is difficult be effective. Sometimes it is a bad idea to blow debris all the way through a pipe because there may be personnel on the other end or it is simply too long or it may be sealed on an end.
Model 1004SS: This is a M4 x 0.5 and delivers the smallest, most effective airflow for cleaning out small diameter tubes, pipes, channels or holes for diameters between 1/4″ up to 1″. Extension pipes available from 6″ up to 36″ in length.
Model 1006SS: The 1/4 NPT Back Blow Nozzle recommended for a wide range of diameters from 7/8″ up too 4″. Extension pipes available from 12″ up to 72″ in length.
Model 1008SS: 1 NPT female and the largest Back Blow Nozzle in stock for diameters from 2″ up to 16″ with pip extensions available from 12″ up to 72″ long.
These nozzles can also be assembled to our VariBlast, Soft Grip, Heavy Duty and Super Blast Safety Air Guns. EXAIR safety air gun options include chip shields and pipe extensions up to 72″ long. EXAIR has the products and accessories you need to make any job more efficient saving you time and money. Give us call at 800.903.9247 and ask for any of our qualified Application Engineers to help you. Most items are stock and can be shipped the same day if we receive and enter your order by 3:00PM EDT.
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.
Compressed air is expensive, and you should treat it that way. Frequent readers of the EXAIR Blog are familiar with our Six Steps to Compressed Air Optimization, and you may have seen these recent installments on Steps 1 and 2:
Now, there isn’t a strict order in which you MUST perform these steps, and they’re not all applicable in every air system (looking at you, Step 5: Use Intermediate Storage,) but these are likely the steps that a certified auditor will take, and the order in which they’ll take them. If you’re looking for immediate, quantifiable results, though, Step 3 is a great place to start. Consider:
A 1/4″ copper tube blow off can consume as much as 33 SCFM when supplied with compressed air at 80psig. It’ll give you a good, strong blow off, for sure. You can crimp the end and get that down to, say, 20 SCFM or so. Or, you can install a Model 1100 Super Air Nozzle with a compression fitting, and drop that to just 14 SCFM.
If you’re tracking your compressed air usage, you’ll see that replacing just one of them saves you 45,600 Standard Cubic Feet worth of compressed in one 5 day (8 hour a day) work week. That’s $11.40 in air generation cost savings, for a $42 (2020 List Price) investment.
If you spend time in the space where it’s installed, you’ll notice a dramatic improvement in the noise situation. That sound level from the copper tube is likely over 100 dBA; the Super Air Nozzle’s is only 74 dBA.
Drilled pipes are another common method to create a blow off. They’re easy & cheap, but loud & expensive to operate.
A pipe drilled with 1/8″ holes and supplied @80psig will consume 13 SCFM per hole, and the holes are typically drilled on 1/2″ centers.
An EXAIR Super Air Knife consumes only 2.9 SCFM per inch of length, and because it’s an engineered product, it’s a LOT quieter as well. Drilled pipes are, essentially, open ended blow offs just like the copper tube mentioned above. When you let compressed air out of a hole like that, all the potential energy of the pressure is converted to force…and noise.
Drilled pipes are among the worst offenders; almost always well in excess of 100 dBA. Super Air Knives generate a sound level of only 69 dBA with 80psig compressed air supply. They are, in fact, the quietest compressed air blowing product on the market today.
These aren’t just theoretical “for instances” either – the data, and the photos above, come from actual Case Studies we’ve performed with real live users of our products. You can find them here, and here (registration required.)
Over Labor Day I got the chance to take my dad and his friend climbing in Seneca Rocks West Virginia for the first time in a very long time. Seneca Rocks is a large Quartzite knife edge located in the Monongahela National forest on route 33. The majority of climbing there is what is known as Trad Climbing, which is just short for traditional climbing and is where one must place their own protection to clip the rope into (also pray it holds when you fall). Trad climbing requires a strong mental fortitude and precise physical movements as you jam different parts of your body into various sized cracks.
In the ever-expanding world of new technology and advancements of outdoor adventure gear, all trad climbers stick with the same gear that was used some 30+ years ago. Although the materials and performance have improved the very principle and mechanics behind them has not. In this case the old saying “If it ain’t broke don’t fix it!” rings true. Sometimes when it comes to a solution, whether its hanging 200’ in the air or updating a process line, traditional is a great choice due to its simplicity and effectiveness.
Compressed air has been around since 1799 but the idea has been around since 3rd Century B.C. making it one of the oldest utilities next to running water. When it comes to manufacturing applications it’s about as tried and true as you can get, so why not look into our engineered products to help you solve your issues. Their simplicity and effectiveness remain, while their efficiency, safety and performance have been engineered to modern day needs. These modern needs have insisted that products be safer and more efficient then they were 30+ years ago.
One example of this is EXAIR’s Vortex Tube. Vortex tubes where discovered in 1931 and were exposed to industrial manufacturing in 1945. EXAIR improved upon them when the company began in 1983. Today they are still used for various cooling applications such as replacing mist coolant on CNC machines, cooling down plastic parts during ultrasonic welding, and keeping electrical cabinets cool so they don’t overheat.
Another example is air nozzles, nozzles are used for many different purposes like cleaning or cooling parts. If you are using nozzles from 30 years ago because they are effective, there is a good chance you can improve you r efficiency and increase safety for your personnel with EXAIR’s engineered Super Air Nozzles. They are designed in a variety of styles to fit your needs from tiny micro nozzles to massive cluster nozzles to blow off or cool a multitude of parts and processes.
If you have any questions about compressed air systems or want more information on any of EXAIR’s products, give us a call, we have a team of Application Engineers ready to answer your questions and recommend a solution for your applications.
Cody Biehle Application Engineer EXAIR Corporation Visit us on the Web Follow me on Twitter Like us on Facebook