What to look for in an Oil-Free Air Compressors in Oxygen Concentrators

oil compressor

In oxygen concentrators, oil-free compressors are employed as a source of clean compressed air. The high quality of air delivered by our compressors is ensured by self-lubricating Teflon piston rings, medically sound components, internal surface coating of the air receivers, automatic dryers, and filtration units.

Rebreathe compressors are used to power missing-critical components in patients who require assistance breathing, including as medical ventilators, oxygen contractors, and other respiratory therapy devices. Our respiratory therapy equipment manufacturers’ products deliver a clean, dependable air stream with minimal power consumption, low sound levels, and compact, lightweight designs.

In this blog, we’ll try to learn how these devices function, and if you’re an OEM-seeker, this is all that you need to know before you settle on one of these devices.

How do Oil-Free Compressors Work?

Oil-free air compressors are the best choice for compressed air applications that require the highest levels of air purity. They’re designed for applications where air quality is crucial to the end product and industrial processes. A 100 percent dry oil-free air supply can be achieved using a number of oil-free compressor technologies. As a result, the lubricating oil does not contaminate the air.

These devices deliver unmatched energy economy and dependability at all speeds thanks to a matching variable speed inverter and magnetic hybrid permanent motor. For the most demanding applications, they produce oil-free air. There are no worn-out motor bearings, pulleys, belts, couplings, or motor shaft seals to replace. In a nutshell, it’s a technological marvel.

Now that we’ve understood their working, let’s see how these devices dovetail with oxygen concentrator devices.

Oil-Free Compressors and Oxygen Concentrators

Respiratory therapy devices, such as oxygen concentrators, filter oxygen (21 percent concentration) from atmospheric air to concentrations of up to 95 percent using an air compressor and sieve technology. Patients receive supplementary air via oxygen concentrators, which can be stationary, portable, or mobile depending on the patient’s health and location. Another type of respiratory therapy that uses an oxygen concentrator is ventilation.

These pumps are frequently used in respiratory therapy equipment because they suit the application’s high flow and high pressure requirements while providing unsurpassed reliability. The most appropriate series for the oxygen tank size and flow it must give to the patient obviously varies according to their oxygen requirements.

Functions and Requirements of Oil-Free Compressors

The rule of thumb when specifying pump flow for oxygen concentrators and ventilators is that pump flow should be five times the device’s requirement.

In addition to performance criteria, depending on the type of equipment, there are a number of other aspects to consider.

Compressors in respiratory devices must provide the following features:

  • High dependability and long service life
  • Maintaining performance requires consistent airflow.
  • Small size
  • Low noise – keep in mind that the gadget is frequently near the patient’s bedside or in the same room, whether in the hospital or at home, work, or elsewhere.
  • Because portable and transportable equipment must be moved about with the patient and rely on battery power, low weight and power consumption are particularly important considerations.

How to select the right Compressor for Oxygen Concentrators?

Oil-free air compressors are perhaps the perfect choice for compressed air applications that require extracting the greatest levels of air purity. Before purchasing one, keep the following two factors in mind:

1- Effective Lubrication

Oil is used to lubricate bearings and gears that are isolated from the compression chamber in oil-free screw compressors. As a result, the lubricating oil does not contaminate compressed air. Lubrication is not required in the compression chamber of a rotary lobe compressor because there is no mechanical contact. Bearings, timing gears, and speed-increasing gears are all lubricated outside the compression chamber, and shaft seals prevent oil from entering the chamber. This guarantees that compression and air supply are oil-free.

2- Cooling

In oil-free compressors, the cooling system typically consists of an air cooler after each stage and oil cooler. These radiators can be either water-cooled or air-cooled. Oil-less rotary lobe compressors, like most industrial air compressors working in the 80-125 psig range, require two stages of compression to handle the heat of compression. Before entering the second stage compression chamber, air exiting the first stage passes via an air intercooler, where its temperature is decreased as close to atmospheric temperature as feasible and the resulting condensate is drained out, before being compressed to the necessary system pressure. A typical air end consists of a cast iron stator housing with air or water cooling passages.

What Is the Life Expectancy of Oil-Free Compressors?

Oil-free compressors, in general, do not last as long as oil-lubricated compressors because their pre-lubrication wears away and degrades over time. A universal motor is used in oil-free compressors, which does not last as long as an induction motor. 

The Teflon coating that is commonly used to lubricate the internal cylinder simply wears away over time, and this wear can be accelerated when an oil-free compressor is used in extreme temperatures or for extended periods of time. If you’re careful, an oil-free air compressor can run for years, but it takes more time and money to maintain than an oil-lubricated air compressor.


Oil-free air compressors are a really considerate option that must be carefully considered for your business. Because of the foundations of how oil-free air compressors work, you could be looking at lower expenses, a smaller environmental footprint, and cleaner air.

If you work in an industry that requires 100 percent clean air, a compressor that doesn’t use internal oil is a good choice. You’ll be able to reduce your carbon footprint by not using oil, and these smaller units tend to use less energy because they have more speed regulation options.

For more information: Shop.servotech.in

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