as a liquid is supplied to the supply channel 6 from a connection piece 8 shown in fig2 which is preferably also integrally formed on the housing 1 and which may be connected to the exhaust of a combustion motor on the other hand air is supplied to the compressor rotor space 3 through an axially extending connection piece 17 see arrow a u2032 which is situated on a housing cover 18 to be fastened to the end of the housing 1 by means of bolts 19 compressed air is then discharged through a discharge channel 7 and a connection piece 9 it should be noted that the housing 1 according to the invention can also be closed at its opposite axial end by a housing cover 20 to which end it may comprise threaded bores 21 only one is represented which bores receive screws or bolts 22 in a similar way as described with reference to bolts 19 in this case this cover would define and limit the rotor space 2 just as the cover 18 delimits rotor space 3 in similar manner cover 20 possesses an axial connection piece 23 through which fluid is discharged in correspondence with arrow a said fluid having been supplied to rotor 2 u2032 through the supply channel 6 as best seen in fig1 the housing 1 is relatively thick but is formed to have a shape that is easily produced however it is within the scope of the present invention to restrict the housing 1 more or less between the turbine rotor space 2 and the compressor rotor space.