Patent ID: 8172917

Claim:
Apparatus for purifying gas while bleeding a crank housing, said apparatus comprising: a housing, inside which a separator chamber is provided, a rotor arrangement comprising a rotor shaft that is rotatably mounted in the housing and a centrifugal rotor located in the separator chamber, a fluid driving device for driving the rotor shaft by means of a driving fluid, and a labyrinth-type seal is provided in a zone of a breakthrough that is capable of sealing the driving chamber from the separator chamber, and wherein the labyrinth-type seal has a sealing washer with a surrounding axial groove, wherein the fluid driving device being disposed in a driving chamber that is separated from the separator chamber by means of a housing partition, wherein the rotor shaft extends through the breakthrough in the housing partition, and wherein the housing partition has a pipe socket, which projects to the driving chamber and which implements the labyrinth-type seal.