A separator disc for a centrifuge, such as for a separator, is provided. The separator disc is designed to be arranged in a separator disc stack in the interior of a drum of the centrifuge in order to separate a material mixture. The separator disc has a truncated cone shell-like main part produced from a blank in a forming method and has an inner surface, an outer surface, and at least one functional element applied thereon. The at least one functional element is produced using an additive manufacturing method.

A method for determining if air is trapped within a centrifugal separator, the separator including a stationary frame, a rotatable assembly, a drive unit for rotating the rotatable assembly relative the frame around an axis of rotation, a feed inlet for supply of a liquid mixture to be separated, a first liquid outlet for discharge of a separated liquid phase and a second liquid outlet for discharge of a heavy phase having a density that is higher than said liquid phase. The rotatable assembly includes a rotor casing enclosing a separation space in which a stack of separation discs is arranged to rotate around a vertical axis of rotation. The method includes closing one of the first and second liquid outlets and restricting the flow from the other outlet; supplying feed to the feed inlet and measuring the flow to the feed inlet and the flow from the restricted outlet; comparing the flow as a function of time between feed inlet and the restricted outlet; and determining that air is trapped within the centrifugal separator if the measured flow as a function of time flow deviates between feed inlet and the restricted outlet.

A method for determining if air is trapped within a centrifugal separator, the separator including a stationary frame, a rotatable assembly, a drive unit for rotating the rotatable assembly relative the frame around an axis of rotation, a feed inlet for supply of a liquid mixture to be separated, a first liquid outlet for discharge of a separated liquid phase and a second liquid outlet for discharge of a heavy phase having a density that is higher than said liquid phase. The rotatable assembly includes a rotor casing enclosing a separation space in which a stack of separation discs is arranged to rotate around a vertical axis of rotation. The method includes closing one of the first and second liquid outlets and restricting the flow from the other outlet; supplying feed to the feed inlet and measuring the flow to the feed inlet and the flow from the restricted outlet; comparing the flow as a function of time between feed inlet and the restricted outlet; and determining that air is trapped within the centrifugal separator if the measured flow as a function of time flow deviates between feed inlet and the restricted outlet.

A solid-bowl screw centrifuge has a rotatable drum with cylindrical and conical portions. At least one solid discharge is arranged in the conical portion of the drum. A screw is arranged in the drum and can rotate at a differential speed in relation to the rotatable drum. At least two drum bearings are used for mounting the drum in a housing and at least one screw bearing is used for mounting the screw in the drum. The drum and the screw mounting are designed in the region of the conical portion or the dry zone in such a way that solid matter is transported with the aid of the screw up to a solid-discharge drum cover, which forms the termination of the conical portion in the axial direction of the drum, in order to leave the drum through multiple openings in the solid-discharge drum cover.

A solid-bowl screw centrifuge has a rotatable drum with cylindrical and conical portions. At least one solid discharge is arranged in the conical portion of the drum. A screw is arranged in the drum and can rotate at a differential speed in relation to the rotatable drum. At least two drum bearings are used for mounting the drum in a housing and at least one screw bearing is used for mounting the screw in the drum. The drum and the screw mounting are designed in the region of the conical portion or the dry zone in such a way that solid matter is transported with the aid of the screw up to a solid-discharge drum cover, which forms the termination of the conical portion in the axial direction of the drum, in order to leave the drum through multiple openings in the solid-discharge drum cover.

A centrifuge (1) for separating intermixed particulate material of different specific gravity. The centrifuge (1) comprising a centrifuge bowl (10) having a plurality of annular recesses (19), a housing (30), an inlet (17), and means for rotating the centrifuge bowl (10) about the central axis (15). An annular cavity (31) is defined between the housing (30) and the centrifuge bowl (10). The annular cavity (31) is fluidly connected to the plurality of annular recesses (19) on the inner surface of the centrifuge bowl by a number of perforations in the centrifuge bowl wall (12). The annular cavity (19) has a fluid inlet to provide fluid into the annular cavity. The annular cavity (19) has an accumulated cross-sectional flow area (Allow) at two different heights in the annular cavity that differs by at least a factor 10.

A centrifuge (1) for separating intermixed particulate material of different specific gravity. The centrifuge (1) comprising a centrifuge bowl (10) having a plurality of annular recesses (19), a housing (30), an inlet (17), and means for rotating the centrifuge bowl (10) about the central axis (15). An annular cavity (31) is defined between the housing (30) and the centrifuge bowl (10). The annular cavity (31) is fluidly connected to the plurality of annular recesses (19) on the inner surface of the centrifuge bowl by a number of perforations in the centrifuge bowl wall (12). The annular cavity (19) has a fluid inlet to provide fluid into the annular cavity. The annular cavity (19) has an accumulated cross-sectional flow area (Allow) at two different heights in the annular cavity that differs by at least a factor 10.

A centrifugal separator for clarification of a liquid mixture into a heavy phase and a light phase, having a centrifugal separator bowl rotatable around an axis and encasing a separation space, and a sludge space radially outward of said separation space. The centrifugal separator bowl includes a hermetic inlet for feeding a liquid mixture to said separation space; a first hermetic outlet for a separated clarified light phase; and a second hermetic outlet for a separated heavy phase; a plurality of outlet conduits extending from an outer position in said sludge space to said second hermetic outlet. Each of the outlet conduits has a flow restriction in the form of a nozzle or vortex diode. A method to control such a centrifugal separator, in order to provide a stable flow through said outlet conduits, is also disclosed.

A centrifugal separator for clarification of a liquid mixture into a heavy phase and a light phase, having a centrifugal separator bowl rotatable around an axis and encasing a separation space, and a sludge space radially outward of said separation space. The centrifugal separator bowl includes a hermetic inlet for feeding a liquid mixture to said separation space; a first hermetic outlet for a separated clarified light phase; and a second hermetic outlet for a separated heavy phase; a plurality of outlet conduits extending from an outer position in said sludge space to said second hermetic outlet. Each of the outlet conduits has a flow restriction in the form of a nozzle or vortex diode. A method to control such a centrifugal separator, in order to provide a stable flow through said outlet conduits, is also disclosed.

A separation system for separating a liquid mixture includes a centrifugal separator. The centrifugal separator includes a stationary frame, a rotatable assembly and a drive unit for rotating the rotatable assembly relative the frame around an axis of rotation. The separator further includes a feed inlet for receiving a liquid mixture to be separated, a first liquid outlet for discharge of a separated liquid light phase and a second liquid outlet for discharge of a liquid heavy phase having a density that is higher than said liquid light phase. The rotatable assembly.sup., includes a rotor casing enclosing a separation space in which a stack of separation discs is arranged to rotate around a vertical axis of rotation. The separation space is arranged for receiving liquid mixture from said feed inlet. The separation system further includes a container arranged downstream of said first and/or second liquid outlet for receiving discharged liquid phase, and a scale for measuring the weight of discharged liquid phase contained in said container.