Abstract: A method for purifying a fluid from contaminating particles in a centrifugal separator with use of a separation aid which is of higher density than the fluid and which binds said particles, the centrifugal separator having a rotor body that rotates about an axis of rotation. The fluid to be purified is led via an inlet into a separation chamber delimited by the rotor body. Separated particles are discharged via a first outlet and clarified fluid cleared is discharged via a second outlet. The fluid being mixed with an amount of separation aid, supplied to the separation chamber. The pollutant particles are bound to the separation aid, which is forced out by the rotation of the rotor body to the periphery thereof. A small flow of separation aid and particles bound thereto are discharged from the separation chamber via the first outlet, and a flow of purified fluid is discharged from the separation chamber via the second outlet.

Abstract: A method for purifying a fluid from contaminating particles in a centrifugal separator by means of a separation aid which is of higher density than the fluid and which binds said particles, the centrifugal separator having a rotor body that rotates about an axis of rotation. The fluid to be purified is led via an inlet into a separation chamber delimited by the rotor body. Separated particles are discharged via a first outlet and clarified fluid cleared is discharged via a second outlet. The fluid being mixed with an amount of separation aid, supplied to the separation chamber. The pollutant particles are bound to the separation aid, which is forced out by the rotation of the rotor body to the periphery thereof. A small flow of separation aid and particles bound thereto are discharged from the separation chamber via the first outlet, and a flow of purified fluid is discharged from the separation chamber via the second outlet.

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: A screw conveyor intended and formed for use in a decanter centrifuge for separation of solid particles from a fluid compound, comprising a central body, at least one conveyor thread and at least one baffle bridging a flow path formed between different parts of the conveyor thread. The screw conveyor has at least two originally separate parts, each of which comprises a portion of said conveyor thread and which are kept together axially. The baffle constitutes a separate member arranged to be kept in place between said parts of the screw conveyor, when these parts are kept together axially, and has a portion which forms a part of the conveyor thread in an area where the conveyor thread intersects with and extends past the baffle.

Abstract: A screw conveyor intended and formed for use in a decanter centrifuge for separation of solid particles from a fluid compound, comprising a central body, at least one conveyor thread and at least one baffle bridging a flow path formed between different parts of the conveyor thread. The screw conveyor has at least two originally separate parts, each of which comprises a portion of said conveyor thread and which are kept together axially. The baffle constitutes a separate member arranged to be kept in place between said parts of the screw conveyor, when these parts are kept together axially, and has a portion which forms a part of the conveyor thread in an area where the conveyor thread intersects with and extends past the baffle.

Abstract: Upon cleaning of crankcase gas generated during operation of an internal combustion engine in its crankcase, a centrifugal separator is used, which includes a rotor arranged for rotation by means of a driving motor and arranged by its rotation suck crankcase gas from the crankcase through a conduit to the centrifugal separator. During operation of the combustion engine a parameter, e.g. a measurement of the load on the combustion engine is sensed, the magnitude of said parameter being related to the amount of crankcase gas generated per unit of time in the crankcase. Depending upon a sensed change of the sensed parameter the rotational speed of the rotor of the centrifugal separator is changed in a way such that the gas pressure in the crankcase is maintained at a predetermined value, or within a predetermined pressure interval, during the operation of the combustion engine.

Abstract: Upon cleaning of crankcase gas generated during operation of an internal combustion engine in its crankcase, a centrifugal separator is used, which includes a rotor arranged for rotation by means of a driving motor and arranged by its rotation suck crankcase gas from the crankcase through a conduit to the centrifugal separator. During operation of the combustion engine a parameter, e.g. a measurement of the load on the combustion engine is sensed, the magnitude of said parameter being related to the amount of crankcase gas generated per unit of time in the crankcase. Depending upon a sensed change of the sensed parameter the rotational speed of the rotor of the centrifugal separator is changed in a way such that the gas pressure in the crankcase is maintained at a predetermined value, or within a predetermined pressure interval, during the operation of the combustion engine.

Abstract: In a separation device for separating particles from a liquid, which is present in a container, a centrifugal rotor is rotatable around a vertical rotational axis. The centrifugal rotor has a tubular inlet member, which extends down into liquid to be treated and which upon rotation of the centrifugal rotor forms a pumping member adapted to pump liquid upwardly and into the centrifugal rotor. The rotatable inlet member is surrounded by a non-rotatable wall, a sealing device being adapted to seal between the rotatable inlet member and the non-rotatable wall. Thereby is avoided that liquid is pumped upwardly on the outside of the inlet member. Furthermore, a smallest possible part of the outside of the inlet member can be in contact with liquid, independent of the level of the liquid surface in the container.

Abstract: In a decanter centrifuge having a rotor (1) and a screw conveyor (2) the rotor is suspended only at its one end, the rotational axis (R) of the rotor extending vertically. The inlet (22) of the rotor (1) for a sludge containing liquid to be separated as well as the rotor outlet (12; 67) for liquid having been freed from sludge are situated at the upper end of the rotor, whereas a sludge outlet (13) for separated sludge is situated at the lower end of the rotor. The rotor (1) as well as the screw conveyor (2) are adapted to be driven through shafts (5, 8) situated at the upper end of the rotor. By the invention it becomes possible by simple means to adapt the decanter centrifuge for different separation duties, since the location of the sludge outlet (13) can be chosen freely without other parts of the decanter centrifuge preventing this.

Abstract: In a decanter centrifuge having a rotor (1) and a screw conveyor (2) the rotor is suspended only at its one end, the rotational axis (R) of the rotor extending vertically. The inlet (22) of the rotor (1) for a sludge containing liquid to be separated as well as the rotor outlet (12; 67) for liquid having been freed from sludge are situated at the upper end of the rotor, whereas a sludge outlet (13) for separated sludge is situated at the lower end of the rotor. The rotor (1) as well as the screw conveyor (2) are adapted to be driven through shafts (5, 8) situated at the upper end of the rotor. By the invention it becomes possible by simple means to adapt the decanter centrifuge for different separation duties, since the location of the sludge outlet (13) can be chosen freely without other parts of the decanter centrifuge preventing this.

Abstract: The rotor of a centrifugal separator includes two axially separated end walls and one surrounding wall situated between the end walls. The end walls and a stack of separation discs within the rotor are maintained axially together by a central fastener. The surrounding wall, which is separate from the two end walls, is movable axially during rotor operation relative to at least one of the end walls. The surrounding wall has an inner diameter at the areas where it seals with the ends walls that is smaller than the portions between those sealing areas.