Screw compressors and expanders

Screw compressors and expanders From Nikola Stosic, ... Ahmed Kovacevic, in Positive Displacement Machines, 2019 Rotor proportions A general feature of screw compressors is that the pressure difference through them causes high rotor loads and this is especially the case for low-temperature refrigeration compressors, where these are large. Therefore, to maintain their rigidity and minimize deflection, rotor profiles usually have a relatively small male rotor addendum in order to increase the female root diameter. This sometimes leads to very shallow and clumsy rotors. An alternative possibility is to increase the female rotor lobe thickness. This greatly increases its moment of inertia, and thereby reduces the rotor deflection more effectively.

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