A centrifugal separator is configured for cleaning of crankcase gases from an internal combustion engine. The centrifugal separator includes a rotor rotatably arranged inside a stationary housing. The stationary housing includes an inlet for crankcase gases, a gas outlet, and a liquid outlet. The rotor includes a stack of separation discs, each separation disc of the stack of separation discs having a center axis, an inner surface, and an outer surface. A circumferential inner end surface extends between the inner surface and the outer surface. The circumferential inner end surface of at least one separation disc of the stack of separation discs includes a substantially flat first surface portion extending at an angle of at least 20 degrees to the center axis.

A centrifugal separator is configured for cleaning of crankcase gases from an internal combustion engine. The centrifugal separator includes a rotor rotatably arranged inside a stationary housing. The stationary housing includes an inlet for crankcase gases, a gas outlet, and a liquid outlet. The rotor includes a stack of separation discs, each separation disc of the stack of separation discs having a center axis, an inner surface, and an outer surface. A circumferential inner end surface extends between the inner surface and the outer surface. The circumferential inner end surface of at least one separation disc of the stack of separation discs includes a substantially flat first surface portion extending at an angle of at least 20 degrees to the center axis.

A centrifugal separator for cleaning gas containing liquid impurities includes a stationary casing, enclosing a separation space through which a gas flow is permitted. The stationary casing includes a surrounding side wall, a first end wall and a second end wall. An inlet extends through the stationary casing and permits supply of the gas to be cleaned. A rotating member includes a stack of separation disks rotatable around an axis of rotation. A drive member rotates the rotating member. A gas outlet permits discharge of cleaned gas, and includes an outlet opening through the side wall. A drainage outlet permits discharge of liquid impurities separated from the gas. The outlet opening is positioned opposite to the stack of separation disks.

A centrifugal separator for cleaning gas containing liquid impurities includes a stationary casing, enclosing a separation space through which a gas flow is permitted. The stationary casing includes a surrounding side wall, a first end wall and a second end wall. An inlet extends through the stationary casing and permits supply of the gas to be cleaned. A rotating member includes a stack of separation disks rotatable around an axis of rotation. A drive member rotates the rotating member. A gas outlet permits discharge of cleaned gas, and includes an outlet opening through the side wall. A drainage outlet permits discharge of liquid impurities separated from the gas. The outlet opening is positioned opposite to the stack of separation disks.

An oil separator configured to separate from gas mist oil contained in target gas of the present invention is aimed to enhance separation efficiency of oil mist contained in target gas while reducing the weight of the separation disks. The oil separator of the present invention includes a rotor. This rotor has a plurality of separation disks 34 (61, 62) layered along the axis line of the spindle. Each of the separation disks 34 are configured with truncated cone shape plate members and have formed concavo-convex ribs 64, 65 extending from the rotational center in the radiation direction on the outer peripheral side parts 61b, 62b corresponding to the inclined surfaces of the truncated cone. The concavo-convex ribs 64, 65 include first convex portions 66 and second convex portions 67 where the first convex portions 66 include on the outer peripheral side parts 61b, 62b a convex on the front surface side and a concave on the back surface side, and the second convex portions 67 include on the outer peripheral side parts 61b, 62b a convex on the back surface side and a concave on the front surface side.

A centrifugal separator for separating milk into a cream phase and a skim milk phase is described. The separator includes a centrifuge bowl, a disc stack of conical discs arranged inside the centrifuge bowl. The disc stack includes a first set of discs and a second set of discs, the discs in the disk stack includes distribution openings such that the milk passes the first set of discs before passing the second set of discs. The discs in the first set of discs are separated from each other by a first distance, and the discs in the second set of discs are separated from each other by a second distance which is smaller than the first distance.

A centrifugal separator for separating milk into a cream phase and a skim milk phase is described. The separator includes a centrifuge bowl, a disc stack of conical discs arranged inside the centrifuge bowl. The disc stack includes a first set of discs and a second set of discs, the discs in the disk stack includes distribution openings such that the milk passes the first set of discs before passing the second set of discs. The discs in the first set of discs are separated from each other by a first distance, and the discs in the second set of discs are separated from each other by a second distance which is smaller than the first distance.

A stack of separation disks, which includes a spindle and a rotor, and separates mist oil from processing-target gas by rotating the rotor and introducing oil for separation and the processing-target gas; the stack constituting the rotor, and the stack including: a first separation disk that is constituted by a plate member having a circular truncated cone shape, and has a rib formed on an inclined surface of the circular truncated cone shape, the rib extending in a first direction inclined toward one direction in a rotation direction with respect to a radial direction from a center of rotation; and a second separation disk that is constituted by a plate member having the circular truncated cone shape, and has a rib formed on an inclined surface of the circular truncated cone shape, the rib extending in a second direction inclined toward another direction opposite the one direction.

A stack of separation disks, which includes a spindle and a rotor, and separates mist oil from processing-target gas by rotating the rotor and introducing oil for separation and the processing-target gas; the stack constituting the rotor, and the stack including: a first separation disk that is constituted by a plate member having a circular truncated cone shape, and has a rib formed on an inclined surface of the circular truncated cone shape, the rib extending in a first direction inclined toward one direction in a rotation direction with respect to a radial direction from a center of rotation; and a second separation disk that is constituted by a plate member having the circular truncated cone shape, and has a rib formed on an inclined surface of the circular truncated cone shape, the rib extending in a second direction inclined toward another direction opposite the one direction.

A rotor of a centrifugal separator, wherein the rotor comprises a central shaft on which an axially movable plate stack, formed by multiple plates, is arranged. A stack base is arranged on the shaft under the plate stack. A stack cap is arranged in an axially moveable manner on the shaft above the plate stack. The rotor includes a compression spring surrounding the shaft, with a first end supported on the shaft and a second end supported on the stack cap, pressing the plate stack together. The rotor includes a sleeve-like extension arranged on the stack cap, projecting into the plate stack and surrounding the shaft with a separation. The compression spring is located inside the extension, at least over a majority of the axial length thereof. A support surface for the second end of the compression spring, is arranged on a base of the extension.