Centrifugal separator for separating solids from a liquid mixture centrally fed through a gear device

A centrifugal separator for separating solids from a liquid mixture, in which the solids in the form of particles are suspended in a liquid having a density smaller than that of the particles, which centrifugal separator includes

• a rotor (1) having a center axis (R), around which it is rotatable at a first speed,
• a screw conveyor (2), which is arranged in the rotor (1) and is rotatable around said center axis (R) at a second speed differing from said first speed, and
• a driving device, which is adapted for rotation of the rotor (1) at said first speed and the screw conveyor (2) at said second speed,
• the rotor (1) being rotatably supported only at its one end through a rotor shaft (5), which is arranged so that the rotor center axis extends substantially vertically,
• the rotor (1) having an inlet for said mixture in the form of at least one inlet channel (22-24), which extends into the rotor at its said one end, a liquid outlet for separated liquid in the form of at least one outlet channel (12;
• 66-68), which extends out of the rotor at its said one end, and a sludge outlet (13) for separated solids situated at the opposite other end of the rotor,
• the rotor including a conical portion (6), at the apex of which said sludge outlet (13) is situated,
• the screw conveyor (2) being formed for transportation of separated solids through said conical portion (6) of the rotor towards the sludge outlet (13), and
• the screw conveyor (2) being engaged for rotation with a conveyor shaft (8), which extends axially through the rotor shaft (5) and is coupled together with said driving device,
• and wherein the screw conveyor (2) supports a partition, which divides the interior of the rotor into one separation chamber (73) and one sludge outlet (74) and which at the surrounding wall of the rotor leaves a slot (72, 78), through which the two said chambers (73, 74) communicate with each other, and wherein a set of separation discs (51) is arranged coaxially with the screw conveyor (2) in said separation chamber (73).