Abstract: This document describes a device for cleaning of crankcase gases from a combustion engine, and a combustion engine having such a device. An inlet conduit is connected to a crankcase of the combustion engine. A centrifugal separator receives a flow of crankcase gases from the crankcase via the inlet conduit and comprises a routable centrifuge rotor for centrifuging the crankcase gases. A drive device drives the centrifuge rotor. An outlet conduit discharges cleaned crankcase gases from the centrifugal separator. The rotary speed of the drive device, and thus the rotary speed of the centrifuge rotor, is controllable depending on the gas pressure in the crankcase. An export conduit may be connected to the inlet conduit and adapted to enable discharge of a flow of crankcase gases from the crankcase by-passing the centrifugal separator depending on the gas pressure in the crankcase.

Abstract: In a centrifugal separator for cleaning a gas containing liquid impurities, a stationary casing encloses a separation space having an inner wall surface. An inlet is provided. A rotating member is provided in the separation space downstream the inlet rotates in a direction of rotation around an axis of rotation. The rotating member brings the gas to rotation in the direction of rotation for separation of liquid impurities from the gas. A gas outlet is provided downstream the rotating member for discharge of the cleaned gas. A first liquid outlet is provided upstream the gas outlet and downstream the rotating member for discharge of separated liquid impurities and comprises an outlet hole. A surrounding ring groove extends outwardly from the inner wall surface in the stationary casing and has a surrounding bottom surface, wherein the outlet hole extends outwardly from the bottom surface.

Abstract: The invention refers to a centrifugal separator for cleaning of a gas containing liquid impurities. The centrifugal separator comprises a stationary casing, which encloses a separation space and has an inner wall surface. A rotating member is provided in the separation space and arranged to rotate in a direction of rotation around an axis (x) of rotation. The rotating member brings the gas to rotation for separation of the liquid impurities from the gas. A gas outlet is provided for discharge of the cleaned gas. A first liquid outlet is provided downstream the rotating member for discharge of separated liquid impurities. The separation space comprises an annular surface which extends between the rotating member and the inner wall surface. The annular surface is configured to transport liquid impurities radially outwardly to the first liquid outlet.

Abstract: In a centrifugal separator for cleaning a gas comprising liquid impurities, a stationary casing encloses a separation space having an inner wall surface. The separator comprises an inlet for the gas. A rotating member rotates around and brings the gas to rotation for separation of at least a main part of the liquid impurities from the gas. A gas outlet is provided downstream the rotating member for discharge of the cleaned gas. A first liquid outlet discharges the liquid impurities and comprises an outlet hole. An annular surface extends inwardly from the wall surface and is located downstream the outlet hole. The first liquid outlet comprises an annular shield element extending from the annular surface at a distance and radially inside the outlet hole. The shield element and the annular surface form an annular groove radially inside the outlet hole.

Abstract: Upon cleaning of crankcase gas generated during operation of an internal combustion engine in its crankcase, a centrifugal separator is used, which includes a rotor arranged for rotation by means of a driving motor and arranged by its rotation suck crankcase gas from the crankcase through a conduit to the centrifugal separator. During operation of the combustion engine a parameter, e.g. a measurement of the load on the combustion engine is sensed, the magnitude of said parameter being related to the amount of crankcase gas generated per unit of time in the crankcase. Depending upon a sensed change of the sensed parameter the rotational speed of the rotor of the centrifugal separator is changed in a way such that the gas pressure in the crankcase is maintained at a predetermined value, or within a predetermined pressure interval, during the operation of the combustion engine.

Abstract: Upon cleaning of crankcase gas generated during operation of an internal combustion engine in its crankcase, a centrifugal separator is used, which includes a rotor arranged for rotation by means of a driving motor and arranged by its rotation suck crankcase gas from the crankcase through a conduit to the centrifugal separator. During operation of the combustion engine a parameter, e.g. a measurement of the load on the combustion engine is sensed, the magnitude of said parameter being related to the amount of crankcase gas generated per unit of time in the crankcase. Depending upon a sensed change of the sensed parameter the rotational speed of the rotor of the centrifugal separator is changed in a way such that the gas pressure in the crankcase is maintained at a predetermined value, or within a predetermined pressure interval, during the operation of the combustion engine.

Abstract: An apparatus for cleaning of crankcase gas coming from an internal combustion engine can be carried by and be releasably coupled to the combustion engine. For this purpose the apparatus comprises an adapter element, which can be connected with the combustion engine, and a housing, which can be releasably coupled to the adapter element and which delimits a separation chamber. The housing supports in the separation chamber a centrifugal rotor that is rotatable about a vertical rotational axis and is arranged for cleaning of the crankcase gas. The centrifugal rotor has a drive shaft extending downwards through a bottom in the separation chamber and into a drive chamber, in which the drive shaft carries a turbine wheel. A nozzle is arranged to spray pressurized lubricating oil against the turbine wheel for rotation thereof and of the centrifugal rotor.