Abstract: A centrifugal separator for separating solid particles from a liquid mixture includes a rotor body. The rotor body has a separation chamber with an inlet for the liquid mixture, one or more liquid outlets for a liquid separated from the liquid mixture, a sludge outlet for the separated solid particles, a screw conveyor adapted to rotate in the rotor body, at a speed differing from the rotational speed of the rotor body, for transporting the separated solid particles in the separation chamber towards and out of the sludge outlet, a drive arrangement adapted to rotate the rotor body and the screw conveyor at their respective speeds, and a control unit which is adapted to control the drive arrangement to rotate the rotor body at a first speed during a separation phase and at a second speed, which is lower than the first speed, during a particle discharge phase.

Abstract: An inlet device for a centrifugal separator for directing the liquid mixture that is to be separated from an inlet pipe to a separation chamber is rotatable around a central rotational axis. The inlet device includes a central conical receiving structure arranged around the axis and including a central receiving zone for receiving the liquid mixture from the inlet pipe and wherein the zone surrounds the apex of the conical receiving structure. The inlet device further includes at least one inlet channel for directing the liquid from the receiving zone to the separation chamber, wherein the channel extends from the periphery of the receiving zone and spirals down the outer surface of the conical receiving structure. Further, the at least one inlet channel extends from the receiving zone in a direction that forms an angle ? with the tangent of the periphery of the receiving zone and ? is less than 90°.

Abstract: An inlet device for a centrifugal separator for directing the liquid mixture that is to be separated from an inlet pipe to a separation chamber is rotatable around a central rotational axis. The inlet device includes a central conical receiving structure arranged around the axis and including a central receiving zone for receiving the liquid mixture from the inlet pipe and wherein the zone surrounds the apex of the conical receiving structure. The inlet device further includes at least one inlet channel for directing the liquid from the receiving zone to the separation chamber, wherein the channel extends from the periphery of the receiving zone and spirals down the outer surface of the conical receiving structure. Further, the at least one inlet channel extends from the receiving zone in a direction that forms an angle a with the tangent of the periphery of the receiving zone and a is less than 90°.

Abstract: The present invention relates to a centrifugal separator for separating solid particles from a liquid mixture, said centrifugal separator comprising a rotor body which is rotatable around an axis of rotation, the rotor body having a separation chamber with an inlet for the liquid mixture, at least one liquid outlet for a separated liquid from the liquid mixture, a sludge outlet for the separated solid particles, a screw conveyor adapted to rotate in the rotor body around the axis of rotation, at a speed differing from the rotational speed of the rotor body, for transporting the separated solid particles in the separation chamber towards and out of the sludge outlet, a drive arrangement adapted to rotate the rotor body and the screw conveyor at their respective speeds, and a control unit which is adapted to control the drive arrangement to rotate the rotor body at a first speed during a separation phase and at a second speed, which is lower than the first speed, during a particle discharge phase.