Patent ID: 7229399

Claim:
A screw conveyor intended and formed for use in a decanter centrifuge for separation of solid particles from a fluid compound, in which such particles are suspended in a liquid having a smaller density than the particles, the decanter centrifuge comprising: a rotor having an inlet for said compound, an outlet for separated solid particles and an outlet for liquid having been freed from solid particles, the rotor being rotatable about a rotational axis at a first velocity, and a screw conveyor arranged in the rotor rotatable about the rotational axis at a second velocity different from the first velocity, the screw conveyor comprising: a central body extending along the rotational axis, at least one conveyor thread extending along and about the central body supported by the same such that a screw shaped flow path is formed around the body, at least one baffle which bridges said flow path between different parts of the conveyor thread to prevent free movement of liquid and solid particles along the flow path towards said outlet for solid particles, and at least two originally separate parts, each of which comprises a portion of said conveyor thread and which are kept together axially, said baffle constituting a separate member arranged to be kept in place between said parts of the screw conveyor, when these are kept together axially, and wherein said separate member 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.