Abstract: In an oil-cooled screw compressor comprising, a compressor body including a pair of a male rotor and a female rotor, a motor including a stator and a motor rotor connected to one of the male and female rotors, and an oil separator container for gathering the oil from a mixture of the gaseous manner and oil to restrain the oil from proceeding with the compressed gaseous matter after the mixture of the gaseous manner and oil is discharged from the pair of male and female rotors, a rotational axis of the motor rotor and the rotational axis of the one of the male and female rotors are coaxial with respect to each other.

Abstract: In an apparatus for cleaning of a gas a centrifugal rotor is rotatable in a separation chamber about a vertical rotational axis (R). The centrifugal rotor is rotatable by means of a turbine wheel arranged in a drive chamber situated below the separation chamber. The centrifugal rotor and the turbine wheel are connected with each other by means of a shaft. The separation chamber and the drive chamber are separated from each other by two partitions, through which the shaft extends and which between themselves form a drainage chamber. A nozzle is arranged to spray a liquid against the turbine wheel in the drive chamber for rotation thereof and of the centrifugal rotor. The drainage chamber has an outlet for draining of liquid having entered the drainage chamber from the drive chamber, so that liquid shall not be able to flow from the drive chamber to the separation chamber.

Abstract: The present invention relates to a gas separation apparatus, a front wall and a separation rotor thereof. The invention especially relates to the modification of the separation rotor and/or the front wall of the gas separation apparatus in such a way that liquid or liquid suspension separated from a mixture containing gas and liquid or liquid suspension by means of said separation rotor may be recirculated as simply as possible back to the process flow at the same time as the gas separated from said liquid or liquid suspension is guided out of the process.

Abstract: This invention relates in general to a guard(s)/cap(s) and/or screen(s) apparatus (single and/or multiple formation) for the nacelle/air inlet for numerous jets, turbojet, turboprop and turboshaft engines—(Helicopters and other VTOL/VSTOL aircraft) such as power plants or the like. This apparatus contains the rotational system(s) as well as the engine shaft attached apparatus and/or pole that allows the mechanism to function by auto induced movement, without limiting engine thrust. Additional security measures have been introduced to the guard(s)/cap(s) and/or screen(s) apparatus, which includes a centrifuge chamber/manifold for particle collector without limiting engine thrust.

Abstract: A centrifugal separator device (10) for separating solid and/or liquid particles which are suspended in gas media, which device comprises a rotor (12) which is provided sedimentation members (14), which is rotatably mounted in a surrounding stationary housing (20) and which has a central inlet for the gas medium which is to be cleaned. The housing (20) has, on the one hand, an outlet (32) for cleaned gas which, during its passage through the sedimentation members (14) in the rotor (12), has been freed form solid and/or liquid particles, and, on the other hand, an outlet (28 a-c) for solid and/or liquid particles which have been transferred onto the inner side of the housing.

Abstract: In a centrifugal separator for cleaning gases generated by an internal combustion engine a housing defines an interior separation chamber. A centrifugal rotor is coupled for rotation to the housing and extends into the separation chamber. A drainage chamber is positioned adjacent the separation chamber and is delimited therefrom by a partition wall. A flow path is provided through which oil, separated from gases generated by the internal combustion engine and collecting on the partition wall, can travel from the separation chamber to the drainage chamber. A pump wheel is coupled to a shaft portion defined by the rotor and extends radially outwardly therefrom. During operation the oil, upon exiting the separation chamber, contacts the pump wheel. Centrifugal forces generated due to the rotation of the pump wheel cause the oil to be thrown into the drainage chamber. The pump wheel also minimizes the potential for oil resident in the drainage chamber to re-enter the separation chamber.

Abstract: This invention relates in general to a guard(s)/cap(s) and/or screen(s) apparatus (single and/or multiple formation) for the nacelle/air inlet for numerous jets, turbojet, turboprop and turboshaft engines—(Helicopters and other VTOL/VSTOL aircraft) such as power plants or the like. This apparatus contains the rotational system(s) as well as the engine shaft attached apparatus and/or pole that allows the mechanism to function by auto induced movement, without limiting engine thrust. Additional security measures have been introduced to the guard(s)/cap(s) and/or screen(s) apparatus, which includes a centrifuge chamber/manifold for particle collector without limiting engine thrust.

Abstract: A heater and/or demister device D for installing in a heater and/or demister circuit of a vehicle. The device D is provided with a fan 7 for producing a flow of warm air from a flow of ambient air and a flow of compressed hot air taken from an engine of the vehicle. The device comprises a cylindrical outer body 9 surrounding the fan 7 and an impeller 3, the impeller 3 being fed with the flow of compressed hot air and driving the fan 7.

Abstract: A motor-driven blower, particularly suited for carpet cleaners and other wet vacuuming appliances, includes a rotating separator cup to impede water droplets and foam from being drawn into the blower. The separator cup is removably connected to a spider bracket that is mounted more permanently to one end of the motor shaft. Since the separator cup is not directly connected to the motor shaft, the cup can be removed without disturbing the rest of the blower. Thus, the blower can be run either with or without the separator cup. Moreover, by not attaching the separator cup directly to the motor shaft, the shaft can be made shorter to minimize vibration and noise at high rpm's.

Abstract: A centrifuge (10) suitable for separating soot from an exhaust gas stream of an internal combustion engine; the centrifuge being disposed between, and arranged coaxially in relation to, a raw gas inlet pipe (11) and a clean gas outlet pipe (12); the centrifuge including a rotating body (20) which is open on both axial end faces, drive vanes (26) arranged adjacent the inlet for driving the centrifuge, and at least one device (29) provided inside said rotating body for reversing or deflecting the exhaust gas flow direction.

Abstract: A liquid vortex separator including a vortex tube (16) with an impeller (13) in the feed end to impart a rotational motion to liquid within the tube, a feed cylinder (12) connected to the vortex tube by a reducing cone (14). The separator has a separating cone (17) at the outlet end, an annular collecting ring (18) for heavy solids and a liquid discharge pipe extending axially from the separating cone. A feed tank (31) and circulating stream arrangement ensures operation of the system at varying feed rates. The liquid vortex separator may also be fitted with microwave generators (40), electrodes (51)powered from a DC source or magnets (60) to produce desired effects or chemical reactions in the material being processed through the liquid vortex separator.

Abstract: This invention relates in general to a guard(s)/cap(s) and/or screen(s) apparatus (single and/or multiple formation) for the nacelle/air inlet for numerous jets, turbojet, turboprop and turboshaft engines—(Helicopters and other VTOL/VSTOL aircraft) such as power plants or the like. This apparatus contains the rotational system(s) as well as the engine shaft attached apparatus and/or pole that allows the mechanism to function by auto induced movement, without limiting engine thrust. Additional security measures have been introduced to the guard(s)/cap(s) and/or screen(s) apparatus, which includes a centrifuge chamber/manifold for particle collector without limiting engine thrust.

Abstract: An apparatus for simultaneous cleaning of a liquid and a gas includes a centrifugal rotor delimiting in a casing a separation chamber that is arranged for through flow and cleaning of the liquid. On the outside of the casing separation discs are mounted for rotation with the centrifugal rotor. Between the separation discs there are formed axially extending separation passages formed for through flow and cleaning of the gas.

Abstract: An apparatus for simultaneous cleaning of a liquid and a gas includes a centrifugal rotor delimiting in a casing a separation chamber that is arranged for through flow and cleaning of the liquid. On the outside of the casing separation discs are mounted for rotation with the centrifugal rotor. Between the separation discs there are formed axially extending separation passages formed for through flow and cleaning of the gas.

Abstract: In an apparatus for simultaneous cleaning of a liquid and a gas a centrifugal rotor for cleaning of the liquid is connected with a device for cleaning of the gas. The centrifugal rotor is contained in a stationary housing, and this housing delimits a supply passage for gas to be cleaned and on its way to the cleaning device. The gas cleaning device comprises a stack of conical separation discs surrounding a gas inlet chamber and surrounded by a receiving chamber that is delimited by a surrounding stationary casing.

Abstract: A centrifugal separator for cleaning of a gas from solid and/or liquid particles suspended therein, includes a stationary housing and a rotor arranged therein. The rotor at its one axial end has a central inlet for gas to be cleaned and delimits a central space communicating with the inlet. Around the central space a stack of conical separation discs is arranged in the rotor. These discs form between themselves several through flow passages which at their one ends communicate with the central space in the rotor and at their other ends communicate directly with a receiving chamber surrounding the rotor in the stationary housing. The rotor supports several turbine blades, which are arranged in a ring around the central inlet of the rotor, and at least one nozzle is adapted to direct a gaseous driving fluid towards the turbine blades for the rotor rotation.

Abstract: In a vehicle adapted to be propelled by means of an internal combustion engine crankcase gases coming from the combustion engine are cleaned by means of a centrifugal separator. The rotor of the centrifugal separator is driven by means of pressurized air delivered by a compressor, e.g. a so called turbo compressor, which is driven by means of the combustion engine. During periods when the compressor delivers pressurized air in an insufficient amount and/or at insufficient pressure the rotor of the centrifugal separator is instead driven by means of pressurized air coming from a container containing so called auxiliary pressurized air. The auxiliary pressurized air may have a substantially larger pressure than the pressurized air normally delivered by the compressor. The combustion engine is used also for accomplishing the overpressure of the auxiliary pressurized air in the container.

Abstract: A centrifugal separator for cleaning of a gas from solid and/or liquid particles suspended therein, includes a stationary housing and a rotor arranged therein. The rotor at its one axial end has a central inlet for gas to be cleaned and delimits a central space communicating with the inlet. Around the central space a stack of conical separation discs is arranged in the rotor. These discs form between themselves several through flow passages which at their one ends communicate with the central space in the rotor and at their other ends communicate directly with a receiving chamber surrounding the rotor in the stationary housing. The rotor supports several turbine blades, which are arranged in a ring around the central inlet of the rotor, and at least one nozzle is adapted to direct a gaseous driving fluid towards the turbine blades for the rotor rotation.

Abstract: A centrifugal separator for separating oil from a gas stream, particularly for venting the crankcase of an internal combustion engine, having a housing (2) in which the flow guiding means are arranged. The flow guiding means are connected to a drive shaft (3). A gas inlet (5) opens into the housing (2), and a gas outlet (6) and an oil outlet (7) lead out of the housing (2). An easily produced and functionally reliable arrangement is obtained if the housing (2) is non-rotatably mounted and an impeller (14) with blades (11) that produce a centrifugal flow is disposed in the housing (2) such that it is rotatable about the longitudinal axis (4) of the drive shaft (3).

Abstract: In a vehicle air is compressed for being used in the brake system of the vehicle, for instance. In the compressor, used for the compression, the air is contaminated with oil and solid particles. In order to be relieved from these particles, before the air is conveyed through a drying filter, the compressed is brought to rotation by means of a rotating member in a centrifugal separator. The rotating member may advantageously include a pile of conical separation discs forming flow passages between each other for the compressed air to be cleaned. By means of an efficient cleaning of the compressed air from particles the life time of the drying filter may be increased.

Abstract: In a centrifugal separator, the rotor of which is adapted to be driven by means of a gaseous driving fluid, the rotor itself supports a ring of turbine blades extending around the rotational axis of the rotor. A stationary nozzle is adapted to direct a flow of the driving fluid towards the ring of turbine members. After the driving fluid has passed between the turbine blades and has influenced them for driving of the centrifugal rotor, it enters a reversing chamber formed by a stationary reversing member. In the reversing chamber the driving fluid is caused to change its direction and is then conducted again towards the ring of turbine members in order to be utilized a second time for driving of the centrifugal rotor.

Abstract: A separator for a wet vacuum cleaner has a bottom and a sidewall connected to the bottom. The sidewall has lamellas delimiting slots, wherein through the slots an air/gas flow enters an interior of the separator, delimited by the bottom and the sidewall, wherein the air/gas flow contains dirt/dust particles and/or water droplets. The lamellas each have at least one radial outer widened section, extending in a rotational direction of the separator, and at least one remaining lamella section, wherein the at least one radial outer widened section and the at least one remaining lamella section delimit together a turbulence chamber, respectively.

Abstract: An oil injected screw compressor has an oil separating mechanism integrated with a compressor and hence is made compact in size. A male rotor and a female rotor are received in a rotor casing. The shafts of these rotors are arranged substantially in a horizontal direction. An inner cylindrical wall is arranged under the rotor casing with its center axis arranged substantially in a vertical direction and an outer wall is arranged substantially in a concentric position with the inner wall. A lower casing is hermetically joined to the outer wall. Oil in the working gas which is injected in the compression process of the oil injected screw compressor is primarily separated from the working gas between the inner wall and the outer wall. The primarily separated working gas flows up inside the inner wall and is guided through a manifold into an oil separating element case where the oil is secondarily separated from the working gas.

Abstract: An air/oil separator (40) comprises a rotor (60) and a casing (62) surrounding the rotor (60). The casing (60) has an inlet (64) at a first axial position (A) for the supply of an air and oil mixture into the air/oil separator (40). The rotor (60) has an outlet (66) for discharging cleaned air from the air/oil separator (40). The rotor (60) carries a plurality of porous members (68, 70, 72). The porous members (68, 70, 72) have an inlet (74) at a second axial position (B) and an outlet (76) at a third axial position (C). The third axial position (C) is arranged axially between the first axial position (A) and the second axial position (B). A first passage (88) supplies the air and oil mixture from the inlet (64) in the casing (62) to the inlet (74) to the porous members (68, 70, 72). A second passage (94) supplies cleaned air from the porous members (68, 70, 72) to the outlet (66) in the rotor (60).

Abstract: A dynamic sand drift barrier stops and accumulates sand, snow or other heavier-than-air particles suspended in moving air currents, to perform as a fence and adjust its position to maintain the operative portions above the top of the accumulated particles using energy derived from the particle and wind movement. The dynamic drift barrier is made of a horizontal Savonius windmill presenting the fence frontal area perpendicular to the prevailing wind direction. Blown particles will rotate the Savonius windmill transferring the longitudinal motion into rotational motion. Two sets of pulleys and related mechanically operative power transmission serves to translate the rotational energy into axial force-displacement energy using four slider crank arm mechanisms. Transported sand will be deposited by the Savonius windmill, and the blown sand energy will drive the four legs of the barrier vertically so that each foot will readjust its height to retain the position of the drift barrier atop the sand dune.

Abstract: A method and an air precleaner for separating heavier-than-air particulate debris from debris laden air to provide a clean airflow are disclosed. A flow path extends through the precleaner from an inlet to an outlet. Debris laden air is drawn into the inlet by a vacuum in communication with the outlet of the precleaner. A vortex flow of the debris laden air is formed in the flow path and flows through a first stage, ejective based precleaner and a second stage, scavenger based precleaner. Each stage centrifugally separates and removes particles of debris from the vortex flow. Efficient operation under extreme conditions with significant improvement in air filter life, is made possible by the air precleaner and method.

Abstract: This invention relates in general to a guard(s)/cap(s) and/or screen(s) apparatus (single and/or multiple formation) for the nacelle/air inlet for numerous jets, turbojet, turboprop and turboshaft engines—(Helicopters and other VTOL/VSTOL aircraft) such as power plants or the like. This apparatus contains the rotational system(s) as well as the engine shaft attached apparatus and/or pole that allows the mechanism to function by auto induced movement,without limiting engine thrust. Additional security measures have been introduced to the guard(s)/cap(s) and/or screen(s) apparatus, which includes a centrifuge chamber/manifold for particle collector without limiting engine thrust.

Abstract: A fuel cell system having a gas-liquid separator that comprises (a) a housing defining an inlet, an outlet, and a longitudinal flow through passage extending between the inlet and the outlet; (b) a plurality of baffles arranged in longitudinally spaced serial relation in and along the passage and each blocking a portion of the cross section of the passage; and (c) means mounting the baffles for relative movement to selectively vary the composite cross-sectional blockage defined by the baffles relative to a sensed parameter of the fuel cell system.

Abstract: An air filter suitable for use on an engine is provided. The air filter includes a hollow filter body into which is positioned a filter installation unit capable of turning within the filter body and constructed to receive a filtering filter. A main air flow opening is formed in one side of the filter body, and a sub air flow opening is formed in another side of the filter body. A dust pick-up part is formed in the filter body having a dust outlet. A ventilator is provided to direct filtered air against an interior surface of a turning filtering filter, and foreign matter accumulated on an exterior surface of the filtering filter is dislodged into the dust pick-up part before being forcibly expelled through the dust outlet.

Abstract: A liquid vortex separator including a vortex tube (16) with an impeller (13) in the feed end to impart a rotational motion to liquid within the tube, a feed cylinder (12) connected to the vortex tube by a reducing cone (14). The separator has a separating cone (17) at the outlet end, an annular collecting ring (18) for heavy solids and a liquid discharge pipe extending axially from the separating cone. A feed tank (31) and circulating stream arrangement ensures operation of the system at varying feed rates. The liquid vortex separator may also be fitted with microwave generators (40), electrodes (51)powered from a DC source or magnets (60) to produce desired effects or chemical reactions in the material being processed through the liquid vortex separator.

Abstract: In connection with cleaning of gas from particles suspended therein and being heavier than the gas the gas is caused to rotate in a chamber delimited in a stationary housing, so that the particles by centrifugal force are separated from the gas and are thrown towards a stationary housing. The rotation of the gas is accomplished by means of a rotor, which includes a stack of conical separation discs arranged coaxially with each other and concentrically with the rotational axis of the rotor. The gas to be cleaned is caused to flow through interspaces between the separation discs, while they are rotating, the particles by the centrifugal force being brought into contact with the insides of the separation discs. In contact with the insides of the separation discs the particles first move along the generatrices of the separation discs and then move along inclined guiding members, which are arranged in contact with said insides.

Abstract: An apparatus and method for moving a flow of air and particulates through a vacuum cleaner having a central hub with a hub axis and a plurality of vanes depending from the hub and extending in an approximately radial direction away from the hub axis, the vanes comprising an inner edge located near the central hub, an outer edge spaced radially outward from the inner edge, a first top edge, a second top edge located between the inner edge and the first top edge, and wherein the second top edge is orientated in a direction less than parallel to the hub axis.

Abstract: The present invention is a separation apparatus that combines the effects of a cylindrical vortex and a series of partial toroidal vortices. The toroidal vortex and cylindrical vortex fluid flows combined provide better separation than either fluid flow alone. Moreover, the present invention may be constructed such that an arbitrary number of partial toroidal vortices, in series, having relatively small radii are formed thereby allowing any level of separation to be achieved.

Abstract: A centrifugal separator (1) for separating impurities entrained in a gas stream (2), in which the centrifugal separator (1) includes at least one rotatable separating member and a turbine wheel (4) for driving the separating member (3).

Abstract: For cleaning of crankcase gas produced by an internal combustion engine, that is arranged for propelling a vehicle, use is made of a centrifugal separator having a centrifugal rotor that is mounted on the vehicle. The cleaning efficiency of the centrifugal separator is changed by changing the rotational speed of an electrical motor, that is connected to a source of current on the vehicle and arranged for driving said centrifugal rotor.

Abstract: A centrifugal separator for cleaning of a gas from solid and/or liquid particles suspended therein, includes a stationary housing and a rotor arranged therein. The rotor at its one axial end has a central inlet for gas to be cleaned and delimits a central space communicating with the inlet. Around the central space a stack of conical separation discs is arranged in the rotor. These discs form between themselves several through flow passages which at their one ends communicate with the central space in the rotor and at their other ends communicate directly with a receiving chamber surrounding the rotor in the stationary housing. The rotor supports several turbine blades, which are arranged in a ring around the central inlet of the rotor, and at least one nozzle is adapted to direct a gaseous driving fluid towards the turbine blades for the rotor rotation.

Abstract: A centrifugal separator for separating oil from a gas stream, particularly for venting the crankcase of an internal combustion engine, having a housing (2) in which the flow guiding means are arranged. The flow guiding means are connected to a drive shaft (3). A gas inlet (5) opens into the housing (2), and a gas outlet (6) and an oil outlet (7) lead out of the housing (2). An easily produced and functionally reliable arrangement is obtained if the housing (2) is non-rotatably mounted and an impeller (14) with blades (11) that produce a centrifugal flow is disposed in the housing (2) such that it is rotatable about the longitudinal axis (4) of the drive shaft (3).

Abstract: The present invention is a design for a highly efficient passive separator. The invention utilizes passive air rotation techniques in combination with centrifugal separation and a particulate reservoir to achieve highly efficient, highly effective separation of, e.g., particulate matter from a fluid.

Abstract: The present invention is a highly efficient separator. The invention utilizes centrifugal separation and a particulate reservoir having a fluid and particulate flow therein to achieve highly efficient, highly effective separation of, e.g., particulate matter from a fluid.

Abstract: For cleaning of crankcase gas produced by an internal combustion engine use is made of a centrifugal rotor, that is journalled in a frame through two axially separated bearings. The centrifugal rotor is caused to rotate by use of part of it also as a rotor of an electrical motor. The electrical motor has a stator, which is kept non-rotating and is charged with electric current for rotation of the centrifugal rotor, the centrifugal rotor being kept journalled during its rotation only in the two bearings.

Abstract: The present invention is a separation apparatus that combines the effects of a cylindrical vortex and a series of partial toroidal vortices. The toroidal vortex and cylindrical vortex fluid flows combined provide better separation than either fluid flow alone. Moreover, the present invention may be constructed such that an arbitrary number of partial toroidal vortices, in series, having relatively small radii are formed thereby allowing any level of separation to be achieved.

Abstract: A system for removing substantially all particular material from an air flow through a passage provides the air flow passage with an area of enlarged circumference containing a coaxial mounted cyclone fan and stationary vanes. The cyclone fan includes a motor driving a cage provided with a plurality of vanes. The stationary vanes are shaped similar to like vanes on the cyclone fan, but are turned in the reverse direction.

Abstract: A centrifugal separator for cleaning of a gas from solid and/or liquid particles suspended therein, includes a stationary housing and a rotor arranged therein. The rotor at its one axial end has a central inlet for gas to be cleaned and delimits a central space communicating with the inlet. Around the central space a stack of conical separation discs is arranged in the rotor. These discs form between themselves several through flow passages which at their one ends communicate with the central space in the rotor and at their other ends communicate directly with a receiving chamber surrounding the rotor in the stationary housing. The rotor supports several turbine blades, which are arranged in a ring around the central inlet of the rotor, and at least one nozzle is adapted to direct a gaseous driving fluid towards the turbine blades for the rotor rotation.

Abstract: A system for removing substantially all particular material from an air flow through a passage provides the air flow passage with an area of enlarged circumference containing a coaxially mounted cyclone fan and stationary vanes. The cyclone fan includes a motor driving a cage provided with a plurality of vanes. The stationary vanes are shaped similar to like vanes on the cyclone fan, but are turned in the reverse direction.

Abstract: A gas centrifuge operating to separate gases of differing chemical composition and molecular weight by a centrifugal force field. Such a centrifuge is operable to separate methane and carbon dioxide, and to produce torque, and a cascade of such centrifuges is operable to concentrate produced streams of carbon dioxide and methane, and to produce torque. A compact centrifugal gas processing system incorporating the gas centrifuge with other centrifugal components, is also provided.

Abstract: A particulate capture system having a plurality of high speed rotating paddles for separating particulate from an air stream. The system includes an air circulating chamber within a centrifuge that separates a first portion of particulate trapped within an air stream. The particulate capture system also has a blender section that separates a second portion of particulate trapped within the air stream. The first portion of particulate is separated via circulating air flow. The second portion of particulate is separated via encapsulating the particulate in water. The water encapsulated particles may be recirculated to a cooler or other device where the particulate may be blended with a bulk product being processed.

Abstract: Device for separating oil mist from blow-by gases from an internal combustion engine, comprising a rotating cylindrical container (17) with a central inlet (23) for gases with oil mist at one end and a central outlet (24) for gases and peripheral outlets (25) for separated oil at the other end. Between the inlet and the outlet, narrow channels (34) extend in several layers, spaced from the axis of rotation, through which the gas with oil drops flows. Under the influence of the centrifugal force the drops of oil are moved at the same time radially, the rotational speed and the length and radial dimension of the channels being adapted to each other so that the oil drops strike the channel walls before flowing out of the channels.

Abstract: A deflector is provided for deflecting foreign matter from the inlet screen of a rotary lawn motor. The rotary lawn motor has an engine that draws air through the inlet screen. The deflector includes an inner element positionable over a center portion of the inlet screen. A first outer element is positioned over a radially outer portion of the inlet screen. A deflection arm extends between the inner element and the first outer element to deflect the foreign matter away from the inlet screen during operation of the lawnmower.

Abstract: A rotary machine is disclosed having a rotor 11, a stator 16, and blade rows 12, 14 on the rotor and stator that impart a high swirl component to gases flowing through the machine so that the denser impurities are deflected radially outwards by centripetal action onto the inner wall of the stator of the machine. A ramped guide surface is provided on the inner wall 17 of the stator along which any impurities separated by the centripetal action from the main gas stream are entrained by the main gas stream and guided to flow from the gas intake side to the gas outlet side of the machine. The guide surface is radially stepped to resist only reverse flow of the separated impurities back towards the gas intake side of the machine and serves at the downstream end of the machine to discharge the separated impurities back into the main gas stream for the impurities to exit from the machine with the main gas stream.

Abstract: For cleaning of crankcase gas produced by an internal combustion engine (31), that is arranged for propelling a vehicle (30), use is made of a centrifugal separator (34) having a centrifugal rotor that is mounted on the vehicle. The cleaning efficiency of the centrifugal separator is changed by changing the rotational speed of an electrical motor (9), that is connected to a source of current on the vehicle and arranged for driving said centrifugal rotor.