Patent ID: 6183407
Filing Date: 2001-02-06
Classification: B04B

Abstract:
A rotor for a centrifugal separator for freeing a liquid from particles suspended therein and having a density larger than that of the liquid, the rotor being rotatable around its center axis (10) and comprisinga casing including two axially separated end walls (1, 8) and a surrounding wall (9) situated therebetween and surrounding the center axis (10),a separation means mounted in the casing and comprising a plurality of separation discs (11), said discs being arranged in the casing between the center axis (10) and the surrounding wall (9) of the casing and being distributed around the center axis (10), to form a plurality of axially extending separation channels, each said separation disc (11) extending both axially and in a direction from the center axis (10) towards the surrounding wall (9) of the casing from a radially innermost part to a radially outermost part of the separation disc, forming an angle with imaginary radii extending from the center axis (10) to the surrounding wall (9),an inlet member (3) delimiting an inlet channel (4) centrally in the casing, said inlet channel (4) communicating with the separation channels through a distribution chamber (24) situated between a first (8) of the end walls of the casing and said separation means, the separation channels extending from the distribution chamber (24) to an area in the vicinity of the other end wall (1) of the casing, andat least one outlet member delimiting an outlet channel (27), which is directed in a way such that liquid flowing out therethrough accomplishes a reaction force on the rotor in its circumferential direction and causes the rotor to rotate in a predetermined rotational direction,wherein the separation discs (11) leave a sludge space for accumulation of separated particles between the radially outer edges of the separation discs and the surrounding wall (9) of the casing,wherein a partition (20-22) is arranged between the separation discs (11) and said other end wall (1) of the casing such that on one side the partition delimits a collecting chamber (25), in which the separation channels open, and on the other side the partition delimits an outlet chamber (26), said partition carrying entrainment members (13) on said one side that delimits the collecting chamber (25), said entrainment members (13) supporting the separation discs (11) and being elongated and forming an angle with the separation discs (11) seen in a plane perpendicular to the rotor center axis,wherein the collecting chamber (25) communicates with the outlet chamber (26) at a radial level in the rotor substantially corresponding to the radial level of the radially innermost parts of the separation discs, andwherein the outlet channel (27) communicates with the outlet chamber (26) and extends to the outside of the rotor, where the outlet channel opens in a liquid free space at a radial level outside said level, at which the collecting chamber (25) and the outlet chamber (26) communicate with each other.