A rotor of a centrifugal separator, including a central shaft, a plurality of identical discs arranged in a stack on the central shaft, the central shaft having on an outer circumference an engagement contour for a rotationally fixed, axially slidable engagement with a corresponding contour on an inner circumference of the discs, the engagement and corresponding contours engageable with one another in multiple rotational positions at a circumferential distance from one another, and each disc having spacing elements situated at a disc circumferential distance from one another, which spacing elements hold each two adjacent discs at an axial distance from one another, forming an intermediate flow gap having a gap dimension. The spacing elements are formed and configured such that, via different rotational positions relative to one another of adjacent discs, at least two different axial dimensions of the flow gap between adjacent discs may be set.

An intermediate cover of a filter housing of a filter for purifying liquids can be mounted in the filter housing for separating a filter receiving space for a filter insert from a centrifuge receiving space for a centrifuge separator by a rotary and/or insertion movement relative to an imaginary axis. The intermediate cover is provided with a portion of at least one clean fluid channel forming a fluidic connection between a clean fluid side of the filter insert and a fluid outlet of the filter housing for a purified clean fluid. The filter insert has a connecting device arranged at an axial end face and connectable to the intermediate cover. An outlet opening for purified clean fluid is arranged at the axial end face and corresponds with an inlet opening of the clean fluid channel of the intermediate cover. The outlet opening at least partially forms the connecting device.

Various example embodiments relate to rotating coalescers. One embodiment includes a housing comprising a first housing section having a blowby gas inlet structured to receive crankcase blowby gases from a crankcase. The housing further comprises an oil outlet. The rotating coalescer includes an endcap and filter media. The filter media is arranged in a cylindrical shape and is coupled to and positioned between the crankcase blowby gases passing through the filter media by coalescing and separating oils and aerosols contained in the crankcase blowby gases. The rotating coalescer includes a hollow shaft extending through the housing and positioned radially inside of the filter media. The hollow shaft forms a blowby gas outlet structured to route filtered crankcase blowby gases out of the housing. The rotating coalescer further includes a drive mechanism operatively coupled to the hollow shaft.

A centrifugal separator for cleaning gas containing contaminants includes a stationary casing, a gas inlet, a rotating member including a plurality of separation members, a gas outlet, a drainage outlet arranged in the lower portion of the stationary casing and a drive member for rotating the rotating member. The axial inner side surface of the stationary casing incudes at least one straight recess extending in the axial direction for accumulating oil that has been separated in the plurality of separation members. The at least one recess includes a first radial recess surface extending from the axial inner side surface of the stationary casing. The at least one recess extends axially on the inner side surface at least along the axial length of the radially outermost portion of the separation members.

An arrangement for cleaning gas includes a centrifugal separator and pre-separation unit. The centrifugal separator 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 from the pre-separation unit, a rotating stack of separation disks, a gas outlet and a drainage outlet for discharging separated liquid impurities. The pre-separation unit is arranged upstream of said inlet of said centrifugal separator, and it comprises a pre-separation inlet having a cross-sectional area A2 and permitting supply of the gas to be cleaned. A2 is larger than the cross-sectional area A1 of the inlet to the separation space of the centrifugal separator. A pre-separation outlet permits supply of gas from the pre-separation unit to the gas inlet of the centrifugal separator. A first chamber and a second chamber arranged downstream thereof are separated by at least one intermediate wall including at least one through-hole.

An oil separator with a housing, in which is rotatably mounted a rotor containing a drive element, an oil separating element and a shaft for driving the oil separating element of the rotor via the shaft of the rotor around the shaft axis. At least one element of the rotor is seated in such a way that it is displaceable via an actuator element axially from a first inoperative positive to a second operating position.

There is provided a filter sub-assembly that comprises a rotary vessel having a rotor body and a closure member to close an opening of the rotor body. The sub-assembly further comprises a liner that is receivable within the rotor body to line an inner surface thereof. The liner is also fluidly sealable to the closure member by a centrifugal force directed radially outwardly from an axis of rotation, about which the rotary vessel is rotatable. The sub-assembly has particular application in a centrifugal filter of a motor vehicle, for example for cleaning engine oil in an engine lubrication system.

An oil separator includes: a spindle; a rotor rotable together with the spindle and having an inner peripheral space, the rotor configured to be rotated by introducing, into the inner peripheral space, separating oil and processing-target gas containing mist oil so that the mist oil is separated from the processing-target gas; a case having an internal space and an inlet hole communicating with the internal space, the internal space housing a separation chamber having the spindle and the rotor; and a lower partition wall member disposed in a lower end of the internal space and provided with a through hole penetrating a center of the lower partition wall member in an up-down direction, the spindle being inserted into the through hole.

Various example embodiments relate to rotating coalescers. One embodiment includes a housing comprising a first housing section having a blowby gas inlet structured to receive crankcase blowby gases from a crankcase. The housing further comprises an oil outlet. The rotating coalescer includes an endcap and filter media. The filter media is arranged in a cylindrical shape and is coupled to and positioned between the crankcase blowby gases passing through the filter media by coalescing and separating oils and aerosols contained in the crankcase blowby gases. The rotating coalescer includes a hollow shaft extending through the housing and positioned radially inside of the filter media. The hollow shaft forms a blowby gas outlet structured to route filtered crankcase blowby gases out of the housing. The rotating coalescer further includes a drive mechanism operatively coupled to the hollow shaft.

A turbine having a turbine wheel, as used for example as a drive for active oil separators, and to a liquid separator using the turbine is described.