Centrifugal separator and rotor having an external hub to shaft connection

摘要

The invention relates to a centrifugal separator for separation of at least two components of a fluid mixture which have different densities. The centrifugal separator comprises a rotor arranged for rotation about a vertical axis of rotation (R) and having a rotor wall which surrounds a separating chamber within the rotor, with an inlet adapted to feeding the fluid mixture into the rotor's separating chamber, and at least one outlet adapted to discharging outwardly from the rotor a component separated from the fluid mixture. A rotor shaft supports the rotor and is drivably connected to a motor (M) for rotation of the rotor about the axis of rotation (R). A hub is provided outside the rotor, and the hub and the rotor shaft are arranged to be connected together from the outside of the rotor by means of a lockable and releasable fastening which is configured to lock the rotor shaft relative to the hub in both a torque-transmitting and an axial force-transmitting way.

主权项

1. A centrifugal separator for separation of at least two components of a fluid mixture which are of different densities, which centrifugal separator comprises:
a rotor rotatable about an axis of rotation and comprising a rotor wall which surrounds an inner space with a separating chamber within the rotor, the rotor wall comprising a lower portion having a planar wall portion positioned on a bottom portion of the rotor, an inlet for feeding the fluid mixture into the rotor's separating chamber, at least one outlet for discharging out from the rotor a component separated from the fluid mixture, a rotor shaft arranged to be connected to a hub on the rotor wall, the rotor being supported via the rotor shaft which is drivably connected to a motor for rotation of the rotor about the axis of rotation; and the hub is situated outside the inner space of the rotor and has for the rotor shaft a connection directed axially outwards from the rotor, with a fastening so arranged at the side of the rotor wall which faces away from the inner space; said fastening is a clamping device arranged to connect the hub to the rotor shaft in a releasable frictional fastening; the hub is configured to radially surround a portion of the rotor shaft and an annular space is arranged radially between the hub and the rotor shaft, in which space said clamping device is slid axially into for frictional engagement with the hub and with the rotor shaft in the releasable frictional fastening between the clamping device, the hub and the rotor shaft; the clamping device comprises a flange having an outer sleeve and an inner sleeve extending axially therefrom, the outer sleeve is expandable radially outwards and configured for frictional engagement with the hub, the inner sleeve is expandable radially inwards and configured for frictional engagement with the rotor shaft to lock the hub to the rotor shaft and the fastening is undone so that the clamping device, the rotor shaft and the rotor are released from one another; and the hub extends axially downward from the planar wall portion a distance sufficient to receive the inner sleeve and the outer sleeve thereby terminating at an unobstructed axial end that engages a portion of the flange of the clamping device and the hub having unobstructed radially outward surfaces configured to provide access to the clamping device whereby the clamping device is operable from the outside of the rotor in order to releasably connect the hub to the rotor shaft.