Method and device for cleaning of a fluid in a centrifugal separator

A method for purifying oil from contaminants, contaminant particles or other particles, comprising subjecting the oil which is to be purified to centrifugal force in a device which comprises surface-enlarging inserts, wherein one or more separation aid is added to the oil before being subjected to the centrifugal force and wherein fluids are separated into their various phases, and a sludge phase is conveyed along the inside of a rotor body by at least one conveying thread towards and out through a first outlet, 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;

• 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.

A device configured to purify oil from contaminating particles, comprising:

• a rotor body rotating about an axis of rotation, which rotor body has a separation chamber with an inlet for oil which is to be purified and a separation aid configured to be added to the oil before being subjected to the rotating, a first outlet for separated particles, and a second outlet for oil which has been cleared of said particles, the rotor body having at least one conveying thread along the inside of the rotor body for conveying the separation aid and particles bound to the separation aid towards and out through the first outlet, 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 the separation chamber, the oil which is to be cleaned is discharged from the 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 the second 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.