The invention relates to: an inlet region (80) of a centrifuge screw (30), the centrifuge screw (30) having, at least in the inlet region (80), a screw hub (32) with an open wall structure, in particular with longitudinal bars (58); and an inlet tube opening (47) of an inlet tube (46), the inlet tube opening (47) opening into the inlet region (80). Opposite the inlet tube opening (47) there is an impact element (70), in particular an impact disc, having an acceleration element (75), the acceleration element (75) being designed such that a medium impinging on the acceleration element (75) can be accelerated in the direction of open spaces (85) of the open wall structure, said open spaces being in particular between the longitudinal bars (58).

A feed box for a decanter centrifuge has a housing with a hollow interior, the housing having a top with an inlet therethrough, a bottom, sides, and opposing open ends, wherein the inlet and the open ends are in fluid communication with the hollow interior. A liner shaped complementary to the hollow interior of the housing, has a top, a bottom, sides, opposing ends, an opening through the top of the liner below the inlet, and a channel through the liner between the opposing ends in fluid communication with the inlet.

A decanter centrifuge includes one or more nozzles through which a slurry may be discharged from a feed chamber into a separation zone within a centrifuge bowl. A scroll conveyor may be coaxially aligned in the separation zone within the centrifuge bowl around the circumference of the feed chamber. In the separation zone, the slurry can be separated into at least a light phase and a heavy phase by centrifugal acceleration generated by rotation of the centrifuge bowl, the feed chamber, and/or the scroll conveyor. Each separated phase can discharge from the centrifuge bowl via respective discharge ports. Each nozzle may include a rectangular aperture and differentiated profiles of its leading edge and trailing edge. In some embodiments, the leading edge of the aperture comprises a rounded profile, while the trailing edge comprises an abrupt edge or a less-rounded edge.

A decanter centrifuge includes one or more nozzles through which a slurry may be discharged from a feed chamber into a separation zone within a centrifuge bowl. A scroll conveyor may be coaxially aligned in the separation zone within the centrifuge bowl around the circumference of the feed chamber. In the separation zone, the slurry can be separated into at least a light phase and a heavy phase by centrifugal acceleration generated by rotation of the centrifuge bowl, the feed chamber, and/or the scroll conveyor. Each separated phase can discharge from the centrifuge bowl via respective discharge ports. Each nozzle may include a rectangular aperture and differentiated profiles of its leading edge and trailing edge. In some embodiments, the leading edge of the aperture comprises a rounded profile, while the trailing edge comprises an abrupt edge or a less-rounded edge.

Accelerators and conveyor bodies for a decanter centrifuge are discussed. A decanter centrifuge may have a bowl forming a sedimentation chamber with a cake discharge and a centrate discharge; a screw conveyor within the sedimentation chamber, the screw conveyor having a conveyor body and a flight, the conveyor body defining a feed chamber; and an accelerator within the feed chamber for increasing the angular velocity of a feed mixture prior to entering the sedimentation chamber, the accelerator comprising an impeller with plural vanes, the plural vanes being releasably mounted to the conveyor body and sized to pass through an axial end of the conveyor body.

Decanter centrifuges and associated acceleration pipes and methods are provided. In accordance with an example, an acceleration pipe for use with a decanter centrifuge including a feed pipe and a screw conveyor having an acceleration chamber includes an acceleration pipe body adapted to be coupled to and rotate with the screw conveyor. The acceleration pipe body includes an acceleration pipe inlet and an acceleration pipe outlet. The acceleration pipe body defines an acceleration pipe flow path extending between the acceleration pipe inlet and the acceleration pipe outlet. The acceleration pipe body is adapted to receive a suspension at the acceleration pipe inlet from the feed pipe and to rotate the suspension, based on a corresponding rotation of the screw conveyor, prior to the suspension exiting the acceleration pipe outlet and being received by the acceleration chamber of the screw conveyor.

The invention relates to a centrifugal screw (10) comprising a screw hub (15) and a screw flight (20) connected to the screw hub (15), the screw hub (15) having, in the longitudinal direction (R), at least one cylindrical longitudinal portion (11) and a portion (12) at the solid-discharge end. According to the invention, an open wall structure (40) is formed only in some sections of the cylindrical longitudinal portion (11), said open wall structure (40) in the cylindrical longitudinal portion (11) extending at most over a length (LW) of 50% of the total length (GL) of the cylindrical longitudinal portion (11).

The invention relates to a screw hub (10) for a centrifugal screw (80), said screw hub (10) having, in the longitudinal direction (R), at least one cylindrical longitudinal portion (11) and a portion (12) at the solid-discharge end, the cylindrical longitudinal portion (11) having an open wall structure (40), and the portion (2) at the solid-discharge end having an at least partly closed shape that differs from a simple conical shape.

A feed box for a decanter centrifuge has a housing with a hollow interior, the housing having a top with an inlet therethrough, a bottom, sides, and opposing open ends, wherein the inlet and the open ends are in fluid communication with the hollow interior. A liner shaped complementary to the hollow interior of the housing, has a top, a bottom, sides, opposing ends, an opening through the top of the liner below the inlet, and a channel through the liner between the opposing ends in fluid communication with the inlet.

An inflow apparatus includes an inlet opening for introducing a starting product into the inflow apparatus, at least one first outlet opening and one second outlet opening different from the first outlet opening for feeding the starting product from the inflow apparatus into the filling zone. The inflow apparatus additionally includes a connection device via which the inlet opening is in flow communication with the first outlet opening and with the second outlet opening. To ensure a homogeneous distribution of the starting product in the filling zone in the peripheral direction, the connection device includes a first passage and a second passage different from the first passage, with the first outlet opening being in flow communication with the inlet opening via the first passage and the second outlet opening being in flow communication with the inlet opening via the second passage.