Compressor rotor structure

A rotor structure for a compressor, the rotor structure comprising:

• a tie bolt and two rotor shafts extending along a rotor axis, the two rotor shafts respectively affixed to the tie bolt;
• a plurality of impeller bodies disposed between the two rotor shafts, the plurality of impeller bodies supported by the tie bolt;
• a plurality of hirth couplings arranged to mechanically couple the plurality of impeller bodies to one another along the rotor axis;
• a respective sealing sleeve affixed onto respective radially outward surfaces of any two adjoining impeller bodies of the plurality of impeller bodies, the respective sealing sleeve arranged to span a circumferentially extending junction between the two adjoining impeller bodies to inhibit passage onto the respective hirth coupling of process fluid being processed by the compressor,
• wherein the sealing sleeve is affixed to a respective one of the two adjoining impeller bodies by way of an interference fit,
• wherein the sealing sleeve is affixed to the other one of the two adjoining impeller bodies by way of a slip fit;
• and
• a circumferentially-extending groove in a first of the radially outward surfaces, and a seal member positioned in the groove to form a seal between the first of the radially outward surfaces and the sealing sleeve.