Patent ID: 7465341

Claim:
An apparatus for cleaning of a gas, comprising: a housing, delimiting a separation chamber having a gas inlet for gas to be cleaned and a gas outlet for cleaned gas, a centrifugal rotor arranged to rotate about a substantially vertical rotational axis (R) in the separation chamber and to entrain in its rotation gas to be cleaned, a drive shaft for rotation of the centrifugal rotor, which drive shaft extends downwardly from the centrifugal rotor through a bottom in the separation chamber and into a drive chamber situated below the bottom, and a driving device for rotation of the drive shaft and thereby the centrifugal rotor, which driving device is arranged to generate one or more jets of a liquid in the drive chamber for accomplishing said rotation of the drive shaft, said bottom delimiting a drainage chamber in an area, in which the drive shaft extends through the bottom, the drainage chamber being situated so that it will receive liquid that unintentionally flows upwardly from the drive chamber along the drive shaft, and the drainage chamber having a liquid outlet for draining of liquid.