![]() ![]() This change in volume is the compression. It is larger at the intake end, and decreases along the length of the rotors until the exhaust port. The working area is the inter-lobe volume between the male and female rotors. The meshing rotors force the gas through the compressor, and the gas exits at the end of the screws. ![]() Gas enters at the suction side and moves through the threads as the screws rotate. In an oil-flooded rotary-screw compressor, lubricating oil bridges the space between the rotors, both providing a hydraulic seal and transferring mechanical energy between the rotors, allowing one rotor to be entirely driven by the other. ![]() In a dry-running rotary-screw compressor, timing gears ensure that the male and female rotors maintain precise alignment without contact which would produce rapid wear. Rotary-screw compressors use two very closely meshing spiral rotors to compress the gas. For five rotations of the female rotor, the male rotor makes six rotations. Working Cross-section through the rotors of a typical screw compressor with a male rotor having 5 lobes and a female rotor having 6. This also allows screw compressors to be significantly quieter and produce much less vibration than piston compressors, even at large sizes, and produces some benefits in efficiency. The gas compression process of a rotary screw is a continuous sweeping motion, so there is very little pulsation or surging of flow, as occurs with piston compressors. Thus the screw of a screw compressor is asymmetrical along its length, while a screw pump is symmetrical all the way. The screw compressor is identical to the screw pump except that the pockets of trapped material get progressively smaller along the screw, thus compressing the material held within the pockets. For smaller rotor sizes the inherent leakage in the rotors becomes much more significant, leading to this type of mechanism being less suitable for smaller compressors than piston compressors. for large refrigeration cycles such as chillers, or for compressed air systems to operate air-driven tools such as jackhammers and impact wrenches. These compressors are common in industrial applications and replace more traditional piston compressors where larger volumes of compressed gas are needed, e.g. Rotary-screw air compressor internal viewĪ rotary-screw compressor is a type of gas compressor, such as an air compressor, that uses a rotary-type positive-displacement mechanism. A compressor (as opposed to a pump) would be shaped the same way, except that the shape of the lobes would change along the length of the screw, so that the volume of the trapped pockets would get squeezed smaller as they get closer to the exhaust port. Principal view of the pumping action of a twin-screw pump with a six-lobe female screw and a five-lobe male screw. ( September 2022) ( Learn how and when to remove this template message) Several templates and tools are available to assist in formatting, such as Reflinks ( documentation), reFill ( documentation) and Citation bot ( documentation). Please consider converting them to full citations to ensure the article remains verifiable and maintains a consistent citation style. This article uses bare URLs, which are uninformative and vulnerable to link rot.
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