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: A centrifugal separator includes a rotor which is rotatable around an axis of rotation. The rotor includes a separation chamber with an inlet for a liquid mixture containing solid particles, at least one liquid outlet for a separated liquid from the liquid mixture, and a solids outlet for the separated solid particles. A screw conveyor is arranged to rotate inside the rotor around the axis of rotation, at a different speed than the rotor. The screw conveyor has at least one conveyor flight for transporting the separated solid particles in the separation chamber towards and out of the solids outlet. The conveyor flight is provided with wear resistant elements arranged along its edge and the wear resistant elements are spaced apart with an interspace between mutually adjacent wear resistant elements.

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.

Abstract: In a centrifugal separator for cleaning a gas containing liquid impurities, a stationary casing encloses a separation space having an inner wall surface. An inlet is provided. A rotating member is provided in the separation space downstream the inlet rotates in a direction of rotation around an axis of rotation. The rotating member brings the gas to rotation in the direction of rotation for separation of liquid impurities from the gas. A gas outlet is provided downstream the rotating member for discharge of the cleaned gas. A first liquid outlet is provided upstream the gas outlet and downstream the rotating member for discharge of separated liquid impurities and comprises an outlet hole. A surrounding ring groove extends outwardly from the inner wall surface in the stationary casing and has a surrounding bottom surface, wherein the outlet hole extends outwardly from the bottom surface.

Abstract: The invention refers to a centrifugal separator for cleaning of a gas containing liquid impurities. The centrifugal separator comprises a stationary casing, which encloses a separation space and has an inner wall surface. A rotating member is provided in the separation space and arranged to rotate in a direction of rotation around an axis (x) of rotation. The rotating member brings the gas to rotation for separation of the liquid impurities from the gas. A gas outlet is provided for discharge of the cleaned gas. A first liquid outlet is provided downstream the rotating member for discharge of separated liquid impurities. The separation space comprises an annular surface which extends between the rotating member and the inner wall surface. The annular surface is configured to transport liquid impurities radially outwardly to the first liquid outlet.

Abstract: In a centrifugal separator for cleaning a gas comprising liquid impurities, a stationary casing encloses a separation space having an inner wall surface. The separator comprises an inlet for the gas. A rotating member rotates around and brings the gas to rotation for separation of at least a main part of the liquid impurities from the gas. A gas outlet is provided downstream the rotating member for discharge of the cleaned gas. A first liquid outlet discharges the liquid impurities and comprises an outlet hole. An annular surface extends inwardly from the wall surface and is located downstream the outlet hole. The first liquid outlet comprises an annular shield element extending from the annular surface at a distance and radially inside the outlet hole. The shield element and the annular surface form an annular groove radially inside the outlet hole.

Abstract: In a decanter centrifuge having a rotor and a screw conveyor the rotor is suspended only at its one end, the rotational axis of the rotor extending vertically. The inlet of the rotor for a sludge containing liquid to be separated as well as the rotor outlet for liquid having been freed from sludge are situated at the upper end of the rotor, whereas a sludge outlet for separated sludge is situated at the lower end of the rotor. The rotor as well as the screw conveyor are adapted to be driven through shafts situated at the upper end of the rotor. By the invention it becomes possible by simple implementation to adapt the decanter centrifuge for different separation duties, since the location of the sludge outlet can be chosen freely without other parts of the decanter centrifuge preventing this.

Abstract: In a centrifugal separator for separating solids from a liquid mixture in which the solids in the form particles are suspended in a liquid having a density less than that of the particles the centrifugal separator includes a rotor rotatable at a first speed. A screw conveyor is arranged in and coaxial with the rotor and rotates at a second speed differing from the first speed. A drive device is adapted for rotation of the rotor at the first speed and the screw conveyor at the second speed. The rotor is totally supported at one end only through a rotor shaft that is arranged so that the rotor central axis extends substantially vertically. The rotor includes an inlet for the mixture, in the form of at least one inlet channel which extends into the rotor at one end and a liquid outlet for separated liquid, in the form of at least one outlet channel which extends out of the rotor at one end, and a sludge outlet for separated solids situated at an opposite end of the rotor.