Compressor with integrated speed multiplier

A compressor (100) for a working fluid having an integrated speed multiplier (110), the speed multiplier (110) comprising:

• a first shaft (111), connected to a motor, carrying a gear (112), supported by first bearings (112′),
• at least one second shaft (113) carrying a pinion (114), arranged circumferentially around the gear (112) and connected to one or more impellers of the compressor (100), the second shaft being supported by second bearings (114′), wherein the pinion (114) and the gearwheel (112) mesh directly or indirectly with each other,
• a mechanical seal (115), placed on one end of the first shaft (111), and
• a casing (116) which contains the shafts (111, 113), the gear (112), the pinions (114), the bearings (112′, 114′) and the working fluid, the compressor being characterized in that the casing (116) in turn comprises:
• a frame (118) which supports the first shaft (111), the gear (112), the related bearings (112′), the at least one second shaft (113) with related pinion (114) and bearings (114′) and is connected via an interface element (117), to the compressor casing (116),
• a shell (119) for containing the pressure of the working fluid and inside which the frame (118) is located, and
• a flexible element (120) interposed between the interface element (117) and the pressure containment shell (119),
• at least one labyrinth seal (121) accommodated on each second shaft (113) and mounted between the interface element (117) and the pinion (114).