Turbo-machine arrangement

A turbo-machine arrangement, comprising:

• at least one single or multi-stage compressor section configured to increase a pressure of a working medium, wherein the at least one single or multi-stage compressor section comprises a compressor shaft;
• an electric machine having a shaft;
• wherein the respective compressor shaft runs coaxially to the shaft of the electric machine;
• wherein the respective compressor shaft is coupled to the shaft of the electric machine;
• a common hermetically sealed single or multi-part housing in which the electric machine and the at least one single or multi-stage compressor section is arranged and mounted in the housing via bearings such that the at least one single or multi-stage compressor section, the electric machine, and the bearings are altogether washed about by the working medium;
• a supply line configured to supply uncompressed working medium to the turbo-machine arrangement;
• a discharge line configured to discharge working medium compressed by the turbo-machine arrangement;
• and
• at least one ejector, supplied via a first line or a first connection with working medium at a first pressure level as propellant to draw in working medium at a lower second pressure level via a second line or a second connection,
• wherein a mixture formed in the at least one ejector of the working medium at the first pressure level and the working medium at the second pressure level is supplied as cooling medium to the electric machine and/or to at least one other assembly to be cooled via a third line or a third connection,
• wherein a return line for the cooling medium conducted via or through the electric machine and/or the at least one other assembly to be cooled is coupled to the supply line of the turbo-machine arrangement such that an opening point of the return line of the cooling medium into the supply line of the turbo-machine arrangement, seen in a through-flow direction of the supply line, lies downstream of a branch-off point of the second line or of the second connection of the supply line of the turbo-machine arrangement.