Abstract: A turbocompressor (1) has an outwardly gas-tight housing (6) within which an electric motor (2) and a multistage radial turbocompressor (3) are arranged on a common shaft (13). For journalling the shaft (13), electromagnetic radial bearings (5) are arranged spaced apart in the direction of the shaft. A gas seal (19) surrounding the shaft (13) is arranged between the electric motor (2) and the radial turbocompressor (3) in order to seal off the electric motor (2) with respect to the radial turbocompressor (3). The electric motor (2) has an inner space (9b, 9c) which is connected in a fluid-conducting manner to an outlet opening (6h; 21) which passes through the housing.

Abstract: A rotordynamic machine for the forwarding of a fluid, such as a turbomachine (2) or a centrifugal pump, has at least one drive and bearing apparatus (1) which is designed as an electrical machine with a stator and with a magnetically journalled rotor (4a). Electrical windings (15, 16) produce the required torque and the magnetic bearing force and are arranged together in the stator. The rotor (4a) forms a section of the shaft (4) of the turbomachine (2) and a control apparatus (7) and excites the two windings (15, 16). A magnetic suspension force acting on the rotor (4a) is produced with the first winding (16) in order to hold the shaft (4) in the radial direction without contact. The torque acting on the rotor (4a) is produced with the second winding (15).

Abstract: The invention relates to a compression apparatus (10) comprising a turbocompressor (1) with a plurality of compression stages (1a, 1b, 1c, 1d) as well as infeed flows (5b, 5c, 5d), where the compression apparatus (10) serves for operating a refrigerant circuit, especially with a hydrocarbon gas such as propane, ethylene, methane, or a mixture thereof, wherein a mixer device (8a, 8b, 8c) is arranged outside the turbocompressor (1) and wherein a preceding and a succeeding compression stage (1a, 1b, 1c, 1d) are connected to one another via the mixer device (8a, 8b, 8c) in such a manner that the infeed flow (5b, 5c, 5d) provided for the succeeding compression stage (1b, 1c, 1d) opens into the mixer device (8a, 8b, 8c) in order to mix the infeed flow (5b, 5c, 5d) with a main flow (6a, 6b, 6c) of the preceding compression stage (1a, 1b, 1c).

Abstract: An arrangement for a dry-gas sliding ring seal in a turbomachine which establishes ambient conditions in the region of the dry-gas sliding ring seals under which no fluid precipitates regardless of whether the machine is operating or not. By supplying heat to the leakage flow during standstill of the turbomachine in a manner similar to that during its operation, an undercooling in the region of the dry-gas sliding ring seal with all its negative effects can be suppressed; and the start-up of the turbomachine takes place starting from a substantially safer operating state.