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Compressors

The Roots Blower

Displacement Compressors Compressor Types Compressors Compressed Air Wiki

You might already know there are two basic principles of air compression. One of those is the principle of displacement compression. There are a lot of compressor types that classify as a displacement compressor. The roots blower is one that outputs a low pressure air flow.

What are roots blowers?

the roots blower is a type of compressor
A Roots blower is a valve-less displacement compressor without internal compression. When the compression chamber comes into contact with the outlet port, compressed air flows back into the housing from the pressure side. Subsequently, further compression takes place when the volume of the compression chamber further decreases with continued rotation. Accordingly, compression takes place against full counter-pressure, which results in low efficiency and a high noise level.

Two identical, usually symmetrical, counter rotating rotors work in a housing, synchronized by means of a set of gear wheels. Blowers are usually air-cooled and oil-free. Their low efficiency limits these blowers to very low pressure applications and compression in a single stage, even if two- and three-stage versions are available. Roots blowers are frequently used as vacuum pumps and for pneumatic conveyance.

Related articles

an illustration about the types of compressors for the atlas copco wiki.

The Screw Compressor

Learn more about air compression and the different types of displacement compressors we know today. Here we’re talking about oil-injected and oil-free twin screw compressors.

an illustration about compressed air in the atlas copco air wiki.

What is Compressed Air?

Compressed air is all around us, but what is it exactly? Let us introduce you to the world of compressed air and the basic workings of a compressor.