Sliding Vane Compressors: How they Work

When it comes to air compressors there are many different types to choose from. Each compressor performs differently and have their own benefits and downfalls. In this case we will be taking a look a Sliding Vane Compressor which is a positive-displacement compressor. Positive-displacement type compressors have a given amount of air or gas that gets trapped in a compression chamber. From there the volume of that air is mechanically reduced causing an increase in the pressure. Sliding vane compressors use a circular stator that is housed in a cylindrical rotor; the rotor contains radially positioned slots where the vanes reside. These vanes are what create the compression in the “cells”.

Diagram of a sliding vane compressor

The inlet port on the system is positioned in a way that allows the air flow into each cell, optimizing the amount of air that each cell can hold. Once the air enters the system the cell size is reduced down farther and farther as rotation continues and each vane is pushed back into its original slot in the rotor. Compression will continue until each cell reaches the discharge port. One of the more common forms of a sliding vane compressor is the lubricant injected variety. These compressors inject a lubricant into the chamber to lubricate the walls and the vanes; this removes the heat of compression, as well as provide a seal on the cell. These air compressors are generally sold in a 10 – 200 HP range with capacities running between 40 – 800 acfm.

Advantages of a lubricant injected sliding-vane compressor include:

  • Compact size
  • Relatively low purchase cost
  • Vibration-free operation does not require special foundations
  • Routine maintenance includes lubricant and filter changes

Some of the disadvantages that come with this type of compressor:

  • Less efficient than the rotary screw type
  • Lubricant carryover into the delivered air will require proper maintenance of an oil-removal filtration system
  • Will require periodic lubricant changes

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
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Photo Credit to Compressed Air Challenge Handbook

Labor Day 2020

Our local annual Labor Day celebration in Cincinnati, OH has been canceled this year. I am certain it is in good company with other events across the nation which have been canceled or greatly modified. But…

EXAIR still wants to celebrate and recognize all you (we) have been through over the course of the past year and certainly the past 6 months.

Here’s to all of the hard working folks who are doing their best to stay productive and positive – thank you. Let’s also not forget anyone who may have lost a job during the pandemic –  EXAIR is with you all and hopes to be part of some improving conditions as we navigate through this together.

As EXAIR does its best to stay positive and strong (easier said then done on some days), we hope you either enjoy the day off or begin to see some improvements that will help your circumstances. Just for the record, if you are in Cincinnati, OH and looking for a job, we currently have a couple to choose from.

EXAIR will be closed on Monday September 7, 2020.

In all cases – we hope you enjoy the weekend,
The EXAIR Team

 

 

CC0 image courtesy of Lamonica Carper via pixy.org

Undersized Regulators Create Performance Problems with Compressed Air

“I have a Cabinet Cooler installed on my panel but it isn’t getting the temperature down cold enough. Can you quote me for a duplicate system to install on this panel?” This was a recent inquiry from a customer regarding an electrical enclosure that they had installed in their plant. The Cabinet Cooler was producing cold air, but not enough to keep the cabinet at their desired temperature. It would seem logical that they need additional capacity, right? While that could be the case, in this instance it most definitely was not.

When we get questions like this, we first want to take a closer look at the current installation. The cooling capacity for each system is published in our catalog. BUT, in order to rate a cooling capacity for any type of cooling system, some assumptions must be made. All Cabinet Coolers are specified with 70°F compressed air fed to the Cabinet Cooler at a pressure of 100 PSIG. In addition, each cooler has a specified volume of air that it must utilize in order to produce that rated cooling capacity. If any one of those parameters change, so does the overall cooling power.

In this particular case, the customer had installed a non-EXAIR pressure regulator just upstream of the cooler. Upon looking at the specifications for this regulator, it was found that the overall volume of air it can deliver was just 10% of the overall volume needed to produce the rated 1700 Btu/hr. They didn’t need another Cabinet Cooler System, they just needed to remove that restriction! Upon learning that it needed 100 PSIG, they removed the regulator and supplied full line pressure. No more heat alarms for that shift!

CC undersized valve

Rather than purchasing and installing an unnecessary system, they were able to get back up and running just by removing the problem upstream. At EXAIR, we want to make sure that you’re getting the most out of our products. Just because you call and inquire about a new purchase doesn’t necessarily mean that you need it. We’re here to help you determine if something is afoul with the current setup and make sure you have all of the knowledge necessary to rectify it.

We’re right in the middle of summer, and boy is it hot out there. If you have panels that are overheating and creating problems for you in your processes, give us a call. With Cabinet Cooler Systems ready to ship same day from stock (with properly sized regulators) you can have it fixed by tomorrow.

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

Know How Much Money You Can Save with EXAIR’s Efficiency Lab

 
Free testing. Verifiable data. EXAIR Efficiency Lab.

When it comes to buying new gear for any kind of outdoor hobby the research almost becomes a full-time job to decided what to get. When I’m hanging 200 ft. in the air off of a single rope, I want to make sure that my harness, rope, and all my other gear is top notch and not going to fail me as my literal life is hanging on the line. Sometimes it would be nice to have a professional climber standing there telling you all of the pros and cons, what they like and dislike about it, and weather it’s worth the buy. Outdoor gear is expensive and climbing equipment is no exception, in an ever-changing world of innovation new things are coming out every week and is just to hard for one person to keep up with.

Similarly, EXAIR has multiple product lines, many new products, and countless applications for our products. That is where our Application Engineers come in; as experts on our products and their applications we can provide in-depth knowledge on the various uses and expected outcomes. 

EXAIR’s Products in action

EXAIR has been making compressed air products since 1983, and have since created a culture of making high quality, safe, and efficient compressed air products. With this in mind we started the Efficiency Lab program for people to take advantage to test your current pneumatic blow-off device and compare it to an EXAIR Intelligent Compressed Air product. We will generate a detailed report on our findings and send it to you for your review. This free service provided to U.S. and Canadian companies allows people to test and look into possible upgrades and cost savings.

During my time as a project and process engineer at Valeo and Tyson I wish I had known about this service.  The Efficiency Lab allows you to look at what your current process is, whether it is an open-ended pipe or some other nozzle and have EXAIR compare it to an EXAIR product for free. Its like getting a free inspection of all your gear and having an expert help you find the best replacement if needed.

You may be wondering why we offer this service; it’s simple, compressed air can be expensive and we want to save you money. Not only are open ended pipes unsafe and can violate OSHA Standards on both dead-end pressure and noise level, but they also use a lot of compressed air. To operate an 1/8” open pipe you are looking at over $2000 a year for just one pipe; there isn’t a single plant that is just going to use one pipe. That is a lot of money that can add up over time, which could easily be saved by changing out what you are using.

The Efficiency Lab is quite simple to use. The simplest way is to contact us (my info below) and we can exchange the information needed to get your product into EXAIR. Once received, we will proceed. We will then calibrate the equipment and standardized procedures to test for noise level, air consumption, and force generated. Based off of this information we will recommend a similar product. Don’t be afraid, let us take care of the hard part of choosing which product is best for your application. If you cannot send any product in, use our  Product Efficiency Survey to provide as many details as possible. 

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
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