The dust collector, that may be used in vacuum cleaner, includes: a primary cyclone unit separating dust from air introduced from outside the dust collector; and a secondary cyclone unit defining axial cyclone bodies separating fine dust from air introduced in an axial direction. The secondary cyclone unit includes casings having outer walls around hollow portions; and a fine dust separating member disposed on the casings to form the axial cyclones. The fine dust separating member includes vortex finders disposed in the casings; band portions enclosing an outer circumferential surface of the vortex finders at a position spaced from the vortex finders, and having a shape corresponding to the casings so as to form the axial cyclones together with the casings; and guide vanes disposed between the vortex finders and the band portions and extending in a spiral direction to induce a rotational flow of air.

The dust collector, that may be used in vacuum cleaner, includes: a primary cyclone unit separating dust from air introduced from outside the dust collector; and a secondary cyclone unit defining axial cyclone bodies separating fine dust from air introduced in an axial direction. The secondary cyclone unit includes casings having outer walls around hollow portions; and a fine dust separating member disposed on the casings to form the axial cyclones. The fine dust separating member includes vortex finders disposed in the casings; band portions enclosing an outer circumferential surface of the vortex finders at a position spaced from the vortex finders, and having a shape corresponding to the casings so as to form the axial cyclones together with the casings; and guide vanes disposed between the vortex finders and the band portions and extending in a spiral direction to induce a rotational flow of air.

A hydraulic fluid de-aeration device for a hydraulically actuated variable valve actuation system is provided. The device includes a bridge and a de-aeration chamber having an upper chamber, a lower chamber, and a central axis. A vent pipe is arranged along the central axis of the de-aeration chamber and can include at least one vent hole. The bridge is arranged such that hydraulic fluid flowing from the bridge is directed towards an outer wall of a top portion of the lower chamber. The device includes a cover that integrates the upper chamber with a vent hole for air that is expelled from the hydraulic fluid. An optional gasket or plate configured with at least one vent hole can be arranged between the upper and lower chamber. The vent pipe can be arranged within the cover and extend through the upper chamber to the lower chamber.

The present concept is a cutting surface and debris container in combination with a vacuum cleaner. The cutting surface and debris container includes a hollow container with a debris storage compartment, and a cutting surface for supporting a workpiece to be cut. The cutting surface has an opening to allow fresh air to be drawn into the container. The top section of the container has an outlet that can connect to a hose which couples the container to a vacuum cleaner. Debris generated from cutting the workpiece is drawn into the container. Large debris particles drop in the debris storage compartment while small particles are extracted by the vacuum cleaner.

The present concept is a cutting surface and debris container in combination with a vacuum cleaner. The cutting surface and debris container includes a hollow container with a debris storage compartment, and a cutting surface for supporting a workpiece to be cut. The cutting surface has an opening to allow fresh air to be drawn into the container. The top section of the container has an outlet that can connect to a hose which couples the container to a vacuum cleaner. Debris generated from cutting the workpiece is drawn into the container. Large debris particles drop in the debris storage compartment while small particles are extracted by the vacuum cleaner.

The disclosure discloses a cyclonic separating apparatus and a cleaning appliance. The cyclonic separating apparatus includes a downstream cyclonic separating assembly which includes at least one cyclonic separator ring including a plurality of cyclonic separators. Each of the cyclonic separators includes a cyclonic separating drum having an upper side edge communicating with a tangential air duct and a curved duct arranged in an upper portion of the cyclonic separating drum and communicating with the tangential air duct. A spiral rise angle of the curved duct is greater than a half cone angle of an inverted cone drum of the cyclonic separating drum.

The disclosure discloses a cyclonic separating apparatus and a cleaning appliance. The cyclonic separating apparatus includes a downstream cyclonic separating assembly which includes at least one cyclonic separator ring including a plurality of cyclonic separators. Each of the cyclonic separators includes a cyclonic separating drum having an upper side edge communicating with a tangential air duct and a curved duct arranged in an upper portion of the cyclonic separating drum and communicating with the tangential air duct. A spiral rise angle of the curved duct is greater than a half cone angle of an inverted cone drum of the cyclonic separating drum.

A centrifugal separator separates mixture of fluid and particulate matter in a cylindrical tank. The mixture enters the tank tangentially though one passage. The mixture is swirled with in the tank the though the use of angled blades to guide flow rotation increasing centrifugal force on the mixture. Separated fluid flows into a discharge pipe and out of the tank. The flow of fluid into the discharge pipe may be provided by an opening along the length of the pipe, the fluid may enter and exit the tank at opposing ends, and the angled blades may be circumferentially offset from adjacent blades.

A method and apparatus are disclosed for separating a multiphase fluid stream that includes a heavier fluid component and a lighter fluid component. The fluid flows along a first helical flowpath with a first pitch. The first helical flowpath is sufficiently long to establish a stabilised rotating fluid flow pattern for the stream. The uniform rotating fluid also flows along a second helical flowpath, the second helical flowpath having a second pitch greater than the first pitch. The lighter fluid is removed from a radially inner region of the second helical flowpath. The method and apparatus are particularly suitable for the separation of oil droplets from water, especially from water for reinjection into a subterranean formation as part of an oil and gas production operation. The method and apparatus are conveniently applied on a modular basis.

A cyclone separation device includes a cyclone chamber for separating dirt from incoming air, a dirt collecting chamber arranged adjacent to the cyclone chamber for collecting dirt particles separated from air, and a dirt duct between the cyclone chamber and the dirt collecting chamber for allowing dirt particles to exit the cyclone chamber into the dirt collecting chamber. To reduce the generation of noise-generating air vortices, the dirt duct has an edge protruding into a direction at an angle to the dirt duct at an exit ridge of the cyclone chamber that is first encountered by the air rotating in the cyclone chamber. Preferably, the edge is formed by a tangential extension of a wall of the cyclone chamber. A vacuum cleaner advantageously includes such a cyclone separation device.