A centrifugal separator includes a frame and a drive member configured to rotate a rotating part in relation to the frame around an axis of rotation. The rotating part includes a spindle and a centrifuge rotor enclosing a separation space. The rotating part is supported by the frame by at least one bearing device. The centrifugal separator further includes a system for detecting rotation of the rotating part. The system includes at least one first type of sector each occupying a first length of the perimeter of a member arranged for rotation with the rotating part, and at least one second type of sector each occupying a second length of the perimeter of the member arranged for rotation. The at least one second type of sector is spaced apart from the at least one first type of sector. The second length is different compared to the first length. The at least one first and second types of sectors are irregularly spaced around the perimeter of the member arranged for rotation. The system further includes an inductive sensor arranged to detect the at least one first and second types of sectors and give rise to a binary pulse sequence upon rotation of the member arranged for rotation. The temporal widths of the binary pulses correspond to the lengths of the at least one first and the at least one second types of sectors, respectively.

An oil separator separating mist oil from processing-target gas includes: a case, a first partition wall and a lower, second partition wall, both partitioning vertically an internal space of the case; a partition dividing a space between the first and second partition walls into an introduction path and a first chamber; a supply hole vertically penetrating the second partition wall from the introduction path to a separation chamber; a communication hole vertically penetrating the second partition wall from the first chamber to the separation chamber; a rotor in the separation chamber; a center-side space in a center part of the rotor, the center-side space communicating with the supply hole through an open, upper part of the center-side space. The rotor separates the mist oil from the processing-target gas flowing from the center-side space to an outer periphery of the rotor, where the separated oil is emitted. The processing-target gas flows into the first chamber through the communication hole.

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 oil separator that separates mist oil from processing-target gas containing mist liquid includes a plurality of separation disks. The plurality of separation disks rotate around an axis, and are stacked and spaced in an axial direction. The separation disk includes an inner peripheral part and an outer peripheral part. The inner peripheral part forms a surface of a frustum of a hypothetical cone or pyramid coaxial with the separation disk, and is inclined with respect to a radial direction toward one side in an axial direction. The outer peripheral part forms a surface of a frustum of a hypothetical cone or pyramid coaxial with the separation disk, and continuously extends outward from an outer peripheral edge of the inner peripheral part. The outer peripheral part is inclined with respect to the radial direction toward another side in the axial direction.

A device for decreasing a concentration of hydrogen exhausted from a fuel cell through an exhaust line includes: a first housing connected to the exhaust line and having an exhaust gas moving path and an air inlet formed therein; a pumping part installed in the first housing and sucking air through the air inlet; a second housing coupled to the first housing and having an air diluting part and a diluted gas moving path formed therein, the air diluting part being connected to the exhaust gas moving path and the diluted gas moving path being connected to the air diluting part; and a nozzle member spraying the air introduced into the air inlet to the air diluting part while being rotated.

A centrifugal separator for cleaning gas containing contaminants includes a stationary casing, a gas inlet, a rotating member, a gas outlet including an outlet opening through a wall of the stationary casing, a drainage outlet arranged in the lower portion of the stationary casing, a drive member for rotating the rotating member, and a stationary axial surface extending into the separation space. The rotating member includes a rotatable axial surface arranged radially outside the stationary axial surface. The rotatable axial surface is arranged at the gas inlet such that liquid contaminants present in the gas to be cleaned is pressed against the rotatable axial surface during operation. The rotating member includes a brim portion extending radially inwards from the rotatable axial surface and forms a ring-shaped sealing gap between the rotating member and the stationary axial surface.

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.

A centrifuge rotor for a centrifugal separator for separation of a relatively heavy phase of a fluid from a relatively light phase of the fluid is disclosed. The centrifuge rotor includes a stack of conical disks, and has a central axis of rotation. Each conical disk has an outward surface and an inward surface. The stack of conical disks includes a plurality of interspaces between adjacent conical disks. The interspaces include first interspaces for separation of the relatively heavy phase from the relatively light phase, and second interspaces. A check valve device is provided in each second interspace for closing the second interspace in an inward direction towards the central axis, and permitting opening of the second interspace in an outward direction. Also a centrifugal separator, a method for separation and a conical disk are disclosed.

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.