Volume ratio for a R718* compressor

A R718* compressor as a two-shaft rotational displacement machine for conveying and compressing gaseous conveyed media, comprising:

• a spindle rotor pair in a compressor housing at a pressure p1 at a compressor inlet and during operation with a higher pressure p2 at a compressor outlet, wherein axes of rotation AR of spindle rotors of the spindle rotor pair are aligned at an angle γ>0 with respect to one another, wherein a neutral axis AN is an angle bisector of the axes of rotation AR;
• wherein for adjustment of an internal volume ratio (as “iV value”) of the R718* compressor, the compressor housing thereof starting from the outlet side with a rotor profile length LR over a length LiV comprises planar, flat iV disks (3j) with the index j for 1≤j≤n where n is the number of these iV disks (3j) where n≥1 with a width bj per iV disk (3j) having planar surfaces PF, wherein the iV disks (3j) for the respective operating conditions are specifically individually displaced parallel to the neutral axis AN via movement control devices (5j) per iV disk (3j) in each case by a distance si where 0<si≤sj with sj as the maximum displacement distance per iV disk (3j) and thus gas emissions Go1 between the iV disks (3j), Go2 via spindle rotor heads as well as GoS via a gas feed thread of the spindle rotor pair into an outlet chamber are made possible to largely avoid over or under-compression which is harmful to the efficiency in the R718* compressor.