Various rotating coalescer elements are described. The rotating coalescer elements include various arrangements of stacked separator discs or cones. In some arrangements, the described rotating coalescer elements include a combination of stacked separator discs or cones and filter media. In some arrangements, the stacked separator discs are designed to provide the largest possible amount of radial-projected separation surface area in a given rotating cylindrical volume, where flow to be cleaned is passing radially (outwardly or inwardly) through the rotating coalescer element. In some arrangements, this is achieved by stacking non-conical separating plates containing various area-maximizing features (e.g., spiral ribs, axial cylinders, spiral grooves, or spiral V shapes).

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.

A housing for a centrifugal separator is disclosed, wherein the centrifugal separator is configured to separate a liquid phase from crankcase gases of an internal combustion engine using a rotor. The housing includes a housing body forming a separation chamber, an opening in the housing body, a bearing retainer arranged at the opening, and a bearing inserted into the bearing retainer. The bearing is configured to receive a rotor shaft extending into the separation chamber. The bearing retainer includes a bearing seat portion provided with a number of plastically deformed zones retaining the bearing in the bearing retainer. A centrifugal separator and a method of retaining a bearing of a rotor shaft in a housing for a centrifugal separator are also disclosed.

A centrifugal separator for cleaning gas containing contaminants includes a stationary casing module including a surrounding side wall enclosing a separation space through which a gas flow is permitted, a gas outlet for cleaned gas, and at least one drainage opening for draining separated liquid contaminants from a lower portion of the stationary casing module; a rotating module including a plurality of separation members arranged in said separation space and being arranged to rotate around an axis of rotation; a drive member arranged for rotating the rotating module around the axis of rotation; and an inlet module arranged axially above the stationary casing module, including an inlet pipe for supply of the gas to be cleaned to the inlet module. The inlet module is in fluid contact with the separation space and a liquid outlet module arranged axially below the stationary casing module and configured to permit discharge of liquid contaminants drained from the stationary casing module. The liquid outlet module includes a lower base portion and at least one upwardly extending portion from the lower base portion. The at least one upwardly extending portion extends axially along the surrounding side wall of the stationary casing module such that the liquid outlet module forms an open container into which the stationary casing module is arranged. The liquid outlet module is attached to the stationary casing module via the at least one upwardly extending portion.

A centrifugal separator for separation of liquid particles from a gas stream, includes a stationary frame, a gas inlet and a gas outlet. The frame comprises a tubular element defining a rotor space inside itself and a liquid transportation space outside the tubular element. A centrifugal rotor is arranged in the rotor space and rotatably supported in the frame around a rotational axis. At least one opening is provided in the tubular element, between the rotor space and the liquid transportation space, for conducting liquid separated from the gas stream from the rotor space to the liquid transportation space.

An oil separator for separating oil mist and/or oil droplets out of gases to be cleaned is described. A ventilation system that has the oil separator that may be used with an internal combustion engine is also described.

A centrifugal separator for separating blow-by gases into cleaned air and liquid for recirculation through an engine.

An oil separator includes a cylindrical housing that accommodates a rotor and is provided with a gas discharge portion (first exhaust portion), the oil separator being configured to introduce target gas from a rotation center side of the rotor to condense oil mist and emit condensed oil from an outer peripheral edge of the rotor and further being configured to discharge from the housing through the gas discharge portion the blow-by gas (target gas) after having the oil mist separated. The oil separator includes a dome portion (sectioning member) that covers from an outside of the housing the gas discharge portion and sections a closed space around the gas discharge portion and an outlet pipe (second exhaust portion) that is provided to the dome portion and that discharges the blow-by gas from the closed space that is sectioned by the dome portion.

An outlet nozzle for centrifuge drums is disclosed. The outlet nozzle includes a nozzle body which has an inlet channel extending axially therein and an outlet channel extending at an obtuse angle to the inlet channel. The outlet channel has an inlet opening and an outlet opening, where the diameter of the outlet channel increases at least in certain portions. The point on the outlet channel which is narrowest in terms of the cross-section is formed by the inlet opening itself and the cross-section of the outlet channel is not reduced at any point over the axial length of the outlet channel in the outlet direction.

A centrifugal separator for cleaning gas containing contaminants includes a stationary casing enclosing a separation space through which a gas flow is permitted, a gas inlet extending through the stationary casing and permitting supply of the gas to be cleaned, a rotating member including a plurality of separation members arranged in said separation space and being arranged to rotate around an axis of rotation, a gas outlet configured to permit discharge of cleaned gas and including an outlet opening through a wall of the stationary casing, a drainage outlet configured to permit discharge of liquid impurities separated from the gas to be cleaned and an electrical motor for rotating the rotating member. The centrifugal separator further includes a control unit configured to control the operation of the electrical motor and to drive the electrical motor in at least two different operational modes and to further switch between operational modes depending at least on information of at least one measured internal parameter of the electrical motor.