A vacuum cleaner, including a cleaner body; and a dust collector provided in the cleaner body, wherein the dust collector includes a first cyclone provided within an outer case to filter foreign matter and dust from air introduced into the dust collector; a second cyclone accommodated within the first cyclone to separate fine dust from the air introduced into the first cyclone; and a screw surrounding part of the first cyclone, and configured to be rotatable in at least one direction with respect to the first cyclone, wherein the screw includes a pillar that spans a height of the mesh filter; and a scraper provided on an inner surface of the pillar facing an outer surface of the mesh filter, and configured to sweep off dust and foreign matter accumulated on the mesh filter during the rotation of the screw.

A vacuum cleaner, including a cleaner body; and a dust collector provided in the cleaner body, wherein the dust collector includes a first cyclone provided within an outer case to filter foreign matter and dust from air introduced into the dust collector; a second cyclone accommodated within the first cyclone to separate fine dust from the air introduced into the first cyclone; and a screw surrounding part of the first cyclone, and configured to be rotatable in at least one direction with respect to the first cyclone, wherein the screw includes a pillar that spans a height of the mesh filter; and a scraper provided on an inner surface of the pillar facing an outer surface of the mesh filter, and configured to sweep off dust and foreign matter accumulated on the mesh filter during the rotation of the screw.

A centrifugal liquid separating system broadly comprises an insert cartridge including a housing, an inlet, one or more flow guides, a stator, a compression nozzle, an expansion nozzle, and an outlet. The flow guides guide liquid flowing into the inlet past the stator into the compression nozzle. The stator induces a rotational vortex into the liquid flow. Liquid with heavier particles in the liquid flow is urged to the outside of the rotational vortex. Liquid with lighter particles and cleaner liquid is urged to the inside of the rotational vortex. The compression nozzle and the expansion nozzle are aligned to cooperatively form an annular liquid channel. The liquid with the heavier particles flows through the annular liquid channel and the liquid with the lighter particles and the cleaner liquid flows to the expansion nozzle to the outlet.

A dust collector for a vacuum cleaner disclosed herein includes a first cyclone to separate dust from air introduced from a lower portion thereof with containing foreign materials and discharge the separated dust into a first dust storing unit, a second cyclone configured to separate fine dust from the air, from which the dust has been separated by the first cyclone, and discharge the separated fine dust, a second dust storing unit that is provided in the first cyclone, and located in a second case to collect therein the fine dust discharged from the second cyclone, and a lower cover to define a bottom surface of the first dust storing unit, the second dust storing unit and the first cyclone upon being closed, and discharge therethrough the foreign materials collected in the first dust storing unit, the second dust storing unit and the first cyclone upon being open.

A dust collector for a vacuum cleaner disclosed herein includes a first cyclone to separate dust from air introduced from a lower portion thereof with containing foreign materials and discharge the separated dust into a first dust storing unit, a second cyclone configured to separate fine dust from the air, from which the dust has been separated by the first cyclone, and discharge the separated fine dust, a second dust storing unit that is provided in the first cyclone, and located in a second case to collect therein the fine dust discharged from the second cyclone, and a lower cover to define a bottom surface of the first dust storing unit, the second dust storing unit and the first cyclone upon being closed, and discharge therethrough the foreign materials collected in the first dust storing unit, the second dust storing unit and the first cyclone upon being open.

Aspects of the disclosure are directed to a system associated with an engine of an aircraft, comprising: a deoiler configured to receive a mixture of air and oil at an input of the deoiler and separate the air from the oil, and a baffle coupled to the input of the deoiler and configured to prevent debris that is larger than a threshold from entering the deoiler.

Aspects of the disclosure are directed to a system associated with an engine of an aircraft, comprising: a deoiler configured to receive a mixture of air and oil at an input of the deoiler and separate the air from the oil, and a baffle coupled to the input of the deoiler and configured to prevent debris that is larger than a threshold from entering the deoiler.

An axial flow element for use in a liquid separation system for an internal combustion engine includes a hub, a groove, a locking member, and a flat layer. The hub includes a cylindrical outer surface. The groove is disposed in the outer surface. The groove extends in a substantially longitudinal direction along the hub from a first end of the hub to a second end of the hub. The locking member is disposed in the groove. The flat layer is disposed between the hub and the locking member.

An axial flow element for use in a liquid separation system for an internal combustion engine includes a hub, a groove, a locking member, and a flat layer. The hub includes a cylindrical outer surface. The groove is disposed in the outer surface. The groove extends in a substantially longitudinal direction along the hub from a first end of the hub to a second end of the hub. The locking member is disposed in the groove. The flat layer is disposed between the hub and the locking member.

A marine outboard motor is provided with an internal combustion engine comprising an engine block defining at least one cylinder, an air intake configured to deliver a flow of air to the at least one cylinder, a crankcase in which a crankshaft is mounted for rotation about a crankshaft axis which is substantially vertical when the marine outboard is vertical, and a crankcase ventilation system configured to vent blow-by gases from the crankcase and to supply vented blow-by gases to the air intake. The crankcase ventilation system comprises a lubricant separation chamber for separating lubricant from the blow-by gases. The lubricant separation chamber is defined by the crankcase and extends along the length of the crankcase substantially parallel to the crankshaft axis.