Should You Consider Rotary Screw Air Compressors For Your Process?

Rotary Screw

Rotary screw compressors are efficient, positive-displacement machines specifically engineered for continuous industrial air supply. Utilizing two interlocking helical rotors, these compressors provide a 100% duty cycle, operate quietly, and require less maintenance than traditional piston compressors. They are particularly well-suited for high-demand environments such as manufacturing and construction.

Rotary air compressors are positive displacement devices engineered for continuous, high-capacity industrial applications, employing rotational motion to capture and compress air. The primary types include rotary screw, sliding vane, scroll, root blower, and liquid ring compressors. These machines are categorized based on their cooling methods, which can be either air-cooled or water-cooled, as well as their efficiency control mechanisms.

Rotary screw compressors, characterized by their two interlocking helical rotors, are the most prevalent type used in various industrial settings. These compressors effectively trap and compress air, making them highly efficient for continuous operation. Their robust design ensures exceptional durability, which is essential for meeting the demands of industrial applications.

Sliding vane compressors operate by utilizing a rotor equipped with several sliding vanes that extend radially. This design facilitates the formation of air pockets between the rotor and the housing, which effectively reduces the volume of air and simultaneously increases its pressure.

Scroll compressors utilize two interleaved spiral scrolls—one stationary and the other orbiting—to compress air without any rotational movement. This design is particularly suited for smaller applications where quiet operation and energy efficiency are essential.

Lobe compressors operate by utilizing two precisely matched lobes to move air from the intake to the discharge port. This mechanism ensures a steady and continuous flow of low-pressure air (4.4 to 14.5 psig).

Liquid ring compressors are a specialized rotary compressor that utilizes a liquid, typically water, as the sealing medium to compress gas. This design is particularly advantageous in applications where it is essential to avoid oil contamination in the process.

Advantages: Rotary compressors, especially screw models, are known for their exceptional energy efficiency, achieving savings of up to 60%. They are designed for continuous operation around the clock, which makes them suitable for demanding industrial, HVAC, and refrigeration applications. With fewer moving parts, these compressors require minimal maintenance and operate quietly with low vibration levels. This combination ensures a consistent and reliable airflow while minimizing oil carryover, making them an excellent choice for environments that prioritize efficiency and performance.

Disadvantages: Rotary compressors, especially the rotary screw variety, entail significant upfront costs and require specialized maintenance. Their efficiency tends to decrease during periods of low air demand, which can result in condensation if the units do not operate at sufficiently high temperatures. Although these compressors are engineered for continuous use, they can incur substantial repair expenses in the event of a failure, particularly due to the high costs associated with air end replacements.

If you have questions about the rotary compressors, or anything regarding EXAIR and our products, please do not hesitate to reach out.

Jason Kirby
Application Engineer
Email: jasonkirby@exair.com
Twitter: @EXAIR_jk

Air Compressors: Rotary Type

What is an air compressor? In simple terms, it is a machine that increases fluid pressure.  It works by either changing the volume of air, positive displacement, or by changing the velocity of the air dynamics.  Many industries use air compressors to operate pneumatic equipment.  In this blog, I wish to cover the Rotary Compressor.

The Rotary Screw Compressor is a very common type of air compressor. This compressor uses dual rotors with meshing lobes that trap air while rotating. The rotation continues to push air toward a discharge port while decreasing the space the air takes up, thus increasing pressure. The rotary type of air compressor has five different sub-categories, reference image above.  This style of air compressor has some clear advantages and disadvantages:

Advantages:

  • Quiet Operations
  • Durability and Low Maintenance
  • High Efficiency
  • Continuous duty Cycle

Disadvantages:

  • High initial cost
  • Specialized maintenance

No matter the type of air compressor you use, they are very costly to operate.  To help you use them efficiently and safely, EXAIR offers a range of products that can clean, cool, blow, conserve, and convey.  This would include our Super Air Knives, Super Air Nozzles, Safety Air Guns, Cabinet Coolers, and much more.  If you want to save energy, increase safety, and cut costs no matter what size air compressor you have, 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

Images Courtesy of the Compressed Air Challenge

Round and Round They Go…. Rotary Compressors: How They Work

Positive-displacement and dynamic displacement compressors are the two high level principles for the generation of compressed air or gas. Positive displacement types are the most common found in industrial facilities. These units draw ambient air into a chamber which it seals off and then works to compress and squeeze it down into a smaller volume. The air is then discharged into the outlet system of the compressor. Out of the many types of positive displacement compressors, today we are going to discuss the rotary style positive displacement air compressors.

1 – Simplified Rotary Vane Compressor



These are available in both lubricant-free as well as lubricant-injected versions. The main function of the compressor is the same, both have two inter-meshing rotors what pull air into the inlet port and then after the rotational processing of the compressor the air is discharged through a discharge port. The in between of the ports is where the important information lies. The air after being sucked into the inlet gets pulled in between two lobes and the stator. As the air is being trapped the space between the lobes becomes increasingly smaller, thus increasing the pressure of the air transferring it to the discharge port.

The lubricated versions will often help to dissipate the heat that is created as the air is being compressed. This lubricant is then possible to transfer into the compressed air stream and must be removed before a point of use product if lubricant-free air is needed for the process. These compressors rank amongst the lower efficiencies in the positive displacement air compressors.

If you are visual learner, feel free to take a few minutes for the video below.

2 – Rotary Compressor Operation


If you would like to discuss the way to get the most out of your compressor, no matter the type, contact an Application Engineer and let us help you determine the most efficient way to use the air effectively.

Brian Farno, MBA – CCASS
National Business Development Manager

BrianFarno@EXAIR.com
@EXAIR_BF

1 – Rotary vane.png – R. Castelnuovo, 10/20/2005 – retrieve from https://commons.wikimedia.org/wiki/File:Rotary_vane.png

2 – Rotary compressor operation – HVACRinfo.com – 8/1/2016 – retrieved from https://www.youtube.com/watch?v=fxDEK3Ymx30

About Dual Acting Reciprocating Compressors

When it comes to generating compressed air there are many types of compressors to utilize within a facility.  One of those types is a dual acting reciprocating compressor.  This is a type of positive displacement compressor that takes advantage of a piston style action and actually compresses air on both directions of the stroke.  Below you can see a video from a company that showcases how a dual acting compressor works and gives a good representation of how it is compressing the air on both directions of travel.

Dual_Recip
Click on this image for video

The reciprocating type of air compressor uses a motor that turns a crank which pushes a piston inside a cylinder; like the engine in your car.  In a basic cycle, an intake valve opens to allow the ambient air into the cylinder, the gas gets trapped, and once it is compressed by the piston, the exhaust valve opens to discharge the compressed volume into a tank.  This method of compression happens for both the single and double acting reciprocating compressors.

With a single acting compressor, the air is compressed only on the up-stroke of the piston inside the cylinder.  The double acting compressor compresses the air on both the up-stroke and the down-stroke of the piston, doubling the capacity of a given cylinder size.  This “double” compression cycle is what makes this type of air compressor very efficient.  A single acting compressor will have an operating efficiency between 100 cfm / 23 kW of air while the double acting compressor has an operating efficiency between 100 cfm 15.5 kW .  Therefore, electricity cost is less with a double-acting reciprocating air compressor to make the same amount of compressed air.

These compressors are ruggedly designed to be driven 100% of the time and to essentially be a Clydesdale of compressors.  They are commonly used with applications or systems requiring higher pressures and come in lubricated or non-lubricated models.

If you would like to discuss air compressors or how to efficiently utilize the air that your system is producing so that you aren’t giving your compressor an artificial load that isn’t needed, contact us.

Brian Farno
Application Engineer
BrianFarno@EXAIR.com
@EXAIR_BF