The Difference Between Rotary Vane & Rotary Screw Compressors

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The Difference Between Rotary Vane & Rotary Screw Compressors

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Posted 29 May 2023 - 07:20 AM

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The Difference Between Rotary Vane & Rotary Screw Compressors

When deciding on a new air compressor, you may consider both rotary vane compressors and rotary screw compressors for their similar benefits. Compared to other types of compressors, these are both relatively easy to install and maintain. They are also quieter than piston compressors and compact enough to fit in a smaller space. Additionally, both are energy-efficient options that are more affordable than larger compressor units.Get more news about Oil-free Rotary Vane Compressor,you can vist our website!

But what sets them apart from each other? While the two have similar applications compared to other compressors, they are unique enough that you should consider the benefits and drawbacks of each before deciding on one. This article will outline the difference between how rotary vane and rotary screw compressors work to help you make the right choice for your operation.
What Is a Rotary Vane Compressor?
A rotary vane compressor is a compressor unit that consists of a cylindrical housing, adjustable rotary vanes on an off-centered drive shaft, an air inlet and an air outlet. Because the drive shaft is off-centered, the blades create airtight chambers of varying sizes as they push against the cylinder wall. When air enters the largest chamber at the inlet, and as the vanes rotate and retract, the chambers become smaller until the walls reduce the air volume. The compressed air then exits at the outlet and powers other processes down the line.

Compared to the rotary screw compressor, the rotary vane compressor has had a long history. The first patent detailing how a rotary compressor works appeared in 1874, eventually evolving into the rotary vane compressor. Specifically, vane compressors have been on the market for around 100 years and remain a reliable and efficient compressor solution.

What Is a Rotary Screw Compressor?
A rotary screw air compressor is a compressor unit that includes a pair of screw rotors on parallel drive shafts — an inlet and an outlet. How the rotary screw air compressor works is dependent on the contrary motion of the rotors. The rotors intertwine when turned in unison, trapping air in between the lobes and flutes of the rotors. The trapped air reduces in volume as the rotors force it into a smaller space until it exits the outlet as compressed air.

In oil-lubricated screw models, the rotors sit in a pool of oil to cool and lubricate the compressor, which dampens noise and helps to form a seal. Oil filters and dryers downstream from the compressor remove oil contamination from the end product. Oil-free screw compressors use other methods of regulating temperature without adding oil to the air. Some use high-quality water to cool the rotors instead, while dry rotors rely on air cooling and specialized temperature-resistant materials for the rotors.