EXAIR Mini Cooler™: Overview 

EXAIR Mini Coolers

EXAIR offers a line of spot cooling devices to blow cold air to remove heat.  Heat can cause premature failures and shortened tool life.  We use the Vortex Tube phenomenon to make very cold air without any moving parts or Freon.  They only need compressed air as the “engine” to spin the air streams into two parts; hot air and cold air.  They are maintenance free and can supply cold air down to a temperature of -50oF (-46oC).  EXAIR “dresses up” a Vortex Tube to make a more functional device for spot cooling.  In this blog, I will cover the smallest of our spot coolers; the Mini Cooler™.   

The EXAIR Mini Cooler was designed for tight areas to cool small objects.  It has a cooling capacity of 550 BTU/hr (139Kcal/hr).  It only uses 8 SCFM (227 SLPM) at 100 PSIG (6.9 bar).  The system will come with a manual drain Filter Separator with mounting bracket, a Swivel Magnetic Base with 100 lb. (45.5Kg) pull magnet, and a flexible hose kit.  We offer two options for the flexible hose kit; a Single Point Hose Kit, model 3808, and a Dual Point Hose Kit, model 3308.  The Single Point Hose Kit will give you one flexible outlet to easily position the cold air stream near the target point.  It will also include a round point tip and a flat-fan tip.  The Dual Point Hose Kit adds a split to have two separate cold outlets; still including the round and flat-fan tips.  With these features, the Mini Cooler is easy to mount, use, and move for optimal cooling and blowing. 

Model 3308

When using the Mini Cooler, the flexible cold outlets can easily bend around fixtures, spindles, and welding horns.  The swivel magnetic base gives extra adjustment at the base of the cooler to aid in “hard to reach” places.   To further the benefits of the cooler, the operating pressure can be changed to lower or raise the cooling capacity to meet your demands.  At 100 PSIG (6.9 bar), the cold air flow can reach a temperature as low as 20oF (-7oC).

Some applications for the Mini Cooler would include small diameter milling and drilling where the cold air can keep the tool cool and remove the chips.  It can also be used for soldering, industrial sewing, ultrasonic welding, or even small punching applications to list a few.  With the dual point hose kit, it is ideal for targeting two sides of a cutter, aiming at multiple blades where material is being slit, or cooling multiple ultrasonic points for faster cycle times.

If you believe that you have an application where spot cooling could increase production rates and/or extend tool life, you can contact an Application Engineer at EXAIR.  We can offer the Mini Cooler for smaller targets; or, larger versions like the Adjustable Spot Cooler and Cold Gun Aircoolant System™.  We are looking forward to hearing from you.

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

Informal Video: Converting to a Wireless Digital Flowmeter

If you have a standard Digital Flowmeter from EXAIR, you can convert it to a Wireless Digital Flowmeter. Making this conversion allows you to transmit you r compressed air data over a ZigBee mesh network. This data can be passed from meter to meter, which extends the distance the data can be transmitted. Each meter has a wireless range of 100′ (30meters). Once converted, a wireless to ethernet gateway transmits the data to EXAIR’s free graphing software. By Here is an informal video demonstrating this.

As mentioned in the video, you can set up your Wireless Digital Flowmeter and Gateway here: Video Blog: EXAIR’s New Wireless Digital Flowmeter Installation. If you have any questions, you can contact an EXAIR Application Engineer. We will be happy to help.

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

Mufflers to Protect Manufacturing Workers Hearing

Mufflers

Many manufacturing plants have a strong focus on safety for their workers.  One major safety concern that is overlooked is noise.   OSHA, Occupational Safety and Health Administration, has a directive that defines the noise exposure over time; 29CFR 1910.95(a).   For an eight-hour day, the maximum noise level is 90 dBA.  Hearing loss is irreversible, but it can be preventable.  The CDC, Center for Disease Control, and NIOSH, National Institute for Occupational Safety and Health, report that “approximately 18% of all manufacturing workers have hearing difficulty”1

EXAIR manufactures engineered products to reduce noise levels in the work environment.  We offer Super Air Nozzles and Safety Air Guns for blow-off applications and pneumatic mufflers for discharge exhaust.  In this blog, I will cover the different types of EXAIR Mufflers that we offer.   

  1. Reclassifying Mufflers are designed to have two functions. They can cut noise levels by 35 dB and remove oil mist from the exhaust air.  Cylinders and valves that exhaust pressurized air may have oil in the line to keep the seals from sticking.  When exhausted, it can create a fine mist which is dangerous for operators.  The Reclassifying Mufflers can reduce the loud noise as well as collect any contamination from the exhaust air.
  2. Sintered Bronze Mufflers are simple in design, cost effective, and easy to install. They have a minimal back pressure to not restrict operations of the pneumatic device.  They come in sizes from #10-32 thread to 1-1/2” NPT.  For a quick and simple way to reduce noise, the Sintered Bronze Mufflers are in stock for fast delivery.
  3. Straight-Through Mufflers offer a way to reduce noise levels without worrying about clogging. They have an aluminum shell lined with sound absorbing foam, and they can reduce the noise level by 20 dB.  EXAIR offers them with ports of ¼” NPT, 3/8” NPT, and ¾” NPT.  One side has a female thread while the opposite side will have a male thread.  This can allow you to connect other items like hose kits to reduce noise.
  4. Heavy Duty Mufflers are used within aggressive environments.  They have an outer aluminum shell with an internal stainless-steel screen.  They protect components like valves and cylinders from contamination entering into the part.  And, the Heavy Duty Muffler can keep contaminant like rust from being ejected at high speed into the work area. They have a typical noise reduction of 14 dB.

Here is a test for you.  If you go and stand in your plant, you can probably hear loud noises coming from your compressed air system.  EXAIR has an engineered product to solve most of them.  On the Hierarchy of Controls for NIOSH, Personal Protection Equipment, PPE, is the least effective.  A better control would be to isolate your operators from the hazard with an engineered product.  EXAIR can offer that solution for many of your blow-offs and pneumatic discharges to reduce noise levels.  This would include; and not limited to; Super Air Nozzles, Safety Air Guns, Super Air Knives, and Mufflers.  If you wish to discuss further the safety improvements that EXAIR can provide, you can contact an Application Engineer.  We will be happy to help. 

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

Note 1: https://www.cdc.gov/niosh/topics/ohl/manufacturing.html

EXAIR Standard Air Knives™: Overview

From left to right: Super, Standard, and Full Flow Air Knives.

EXAIR manufactures three different styles of Air Knives; Super, Standard, and the Full FlowStandard Air Knives are the first model of air knives EXAIR began to manufacture.

Standard Air Knife

The Standard Air Knife uses a Coanda profile for blowing.  The Coanda effect was named after a Romanian aerodynamic pioneer, Henri Coanda, where he found a phenomenon with fluid flow.  He stated that a jet of fluid emerging from an orifice will follow an adjacent flat or curved surface to entrain fluid from the surrounding.  Being that air is a fluid, it will react in the same way.

Compressed air flows through the inlet (1) to the Standard Air Knife, into the internal plenum. It then discharges through a thin gap (2), adhering to the Coanda profile (3) which directs it down the face of the Air Knife. The precision engineered & finished surfaces optimize entrainment of air (4) from the surrounding environment.

The EXAIR Standard Air Knife creates 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.  What does this mean for you?  If we bring in “free” ambient air into the compressed air stream, we add mass to the blowing force.  So, we can use less compressed air which will save you money.  We call this the amplification ratio.  For our Standard Air Knife, it has an amplification ratio of 30:1.  (As in, for every 1 part of compressed air, 30 parts of ambient air is drawn into the stream).  This design makes this product very efficient.

We stock the Standard Air Knives in various lengths from 3” to 48” (76mm to 1219mm) in two types of material; aluminum and 303 stainless steel.  This unique design is very compact; so, it can fit into tight places for blowing and cooling.  The aluminum version uses a plastic shim to set the gap.  They come standard with a 0.002” (0.05mm) shim installed.  We have additional shims to make the Standard Air Knife more versatile.  The Shim Set will include a 0.001”, 0.003”, and a 0.004” thickness shim (.03mm, .08mm, and 0.1mm respectively) for controlling the air flow from a small breeze to a blast.  The shims are color coded for easy verification.  The stainless steel Standard Air Knife comes with a stainless steel shim for higher temperatures and chemical resistance.

Standard Air Knife Kit

We do offer the Standard Air Knives in kits for a more complete package.  The kit will include the Air Knife, a Filter Separator, a Pressure Regulator and the above-mentioned Shim Set.  The Filter Separator will remove the debris and liquid water from the compressed air line to optimize the air knife as well as keeping your products clean.  The Pressure Regulator is used to make “fine” adjustments to the blowing force while the shims are used for a “coarse” adjustment to the blowing force.  Together, you can “dial” in the right amount of air required to do the job without wasting compressed air.

For easy mounting, we do offer a Universal Air Knife Mounting System.  This system is used to position your air knife securely and precisely.  It comes with a bracket to mount to the Air Knife and can be articulated in any position with a reach up to 30” (762mm).  You can direct the Standard Air Knife to maximize the effectiveness.  It is easy to use as seen in this video: CLICK HERE.

With today’s cost to make compressed air, it is important to do it as efficiently as possible.  The Standard Air Knife has the ability to give you the effective blowing to remove debris, dry parts, or cool objects without using a large amount of compressed air.  As another feature, the Standard Air Knife is quiet.  It only has a sound level of 83 dBA at 80 psig (5.5 bar).  So, by using this EXAIR product, you are not creating a noise nuisance in the work environment.  If you have any questions about the Standard Air Knife or if you would like to discuss an application, you can contact an Application Engineer at EXAIR.  We will be happy to help. 

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