Patent ID: 8790233

Claim:
A method for purifying oil from contaminating particles in a centrifugal separator by means of a separation aid which is of higher density than the oil and which binds said particles, comprising a centrifugal separator having a rotor body caused to rotate about an axis of rotation, said rotor body comprising a cylindrical upper portion and a conical lower portion, and a stack of truncated conical separation discs arranged centrally in the cylindrical upper portion, the separation discs having base ends facing away from a first outlet for separated particles, said upper portion and said lower portion delimiting a separation chamber, the oil which is to be cleaned is discharged from an inlet, and is after discharge led via channels to the upper portion into the separation chamber delimited by the rotor body and upwards through openings in the separation discs which form an axial channel for axial flow of the oil to be cleaned, the separated particles are discharged via the first outlet and the oil cleared of said particles is discharged via a second outlet, said oil being mixed with an amount of separation aid, being supplied to the separation chamber and being purified therein by the pollutant particles being bound to said separation aid, which separation aid is forced out by the rotation of the rotor body to the periphery of the rotor body, a small flow of separation aid and particles bound thereto being discharged from the separation chamber via the first outlet, and a flow of purified oil being discharged from the separation chamber via the second outlet, and conveying said separation aid and particles bound thereto along the inside of the rotor body by at least one conveying thread towards and out through the first outlet; and wherein the first outlet is centrally and axially directed and arranged at a lower end of the rotor body, and the rotor body is suspended and journalled at its upper end.