A cyclonic dust filter device comprises a trunk, at least one first retaining wall, and at least one second retaining wall. The trunk comprises a channel, an air inlet end and an air outlet end disposed at two ends of the channel, and a dust filter hole communicating with the channel. The first and second retaining walls are respectively disposed correspondingly to the dust filter hole. When a dust-containing airflow to-be-filtered enters the channel from the air inlet end, the dust-containing airflow forms a centrifugal airflow that contains the dust and is thrown out of the channel at a position of the dust filter hole. The first and second retaining walls are respectively disposed on a traveling path of the centrifugal airflow, so that the centrifugal airflow sequentially strikes the first and second retaining walls to change the traveling direction and then discharges dust free clean air.

A cyclone separator useable in a surface cleaning apparatus comprises a cyclone chamber and a dirt collection chamber exterior to, and surrounding at least a portion of the cyclone chamber. The dirt collection chamber is in communication with the cyclone chamber via a dirt outlet. An air flow passage extending to the cyclone air inlet travels generally axially through the dirt collection chamber.

Apparatus and methods configured for cyclonic froth separation are disclosed. Exemplary implementations may: provide slurry into a first volute; provide fluid communication between the first volute and an interior of a porous barrier; receive pressurized gaseous fluid through a body wall to an exterior of the porous barrier; provide fluid communication between the exterior of the porous barrier and the interior of the porous barrier; facilitate flows of pressurized gas through the porous barrier; receive outputted froth and output froth to the exterior of the apparatus; provide fluid communication between the interior of the porous barrier and the second volute; retain froth within the interior of the porous barrier; receive slurry exhausted from the interior of the porous barrier; provide fluid communication of exhausted slurry to the exterior of the apparatus.

Apparatus and methods configured for cyclonic froth separation are disclosed. Exemplary implementations may: provide slurry into a first volute; provide fluid communication between the first volute and an interior of a porous barrier; receive pressurized gaseous fluid through a body wall to an exterior of the porous barrier; provide fluid communication between the exterior of the porous barrier and the interior of the porous barrier; facilitate flows of pressurized gas through the porous barrier; receive outputted froth and output froth to the exterior of the apparatus; provide fluid communication between the interior of the porous barrier and the second volute; retain froth within the interior of the porous barrier; receive slurry exhausted from the interior of the porous barrier; provide fluid communication of exhausted slurry to the exterior of the apparatus.

An inventive apparatus induces a vortex in a liquid flow (e.g., storm-water runoff) to remove particulates from the liquid. The apparatus can be inserted into a tubular portion (e.g., a manhole) such that a sump region is located below the apparatus. The apparatus includes a base and a weir extending upwardly from the base. The base has a first region including a funnel shape with a sump inlet aperture. The base also has a second region including a sump outlet aperture and optionally a sump access aperture. The weir separates the first region from the second region.

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 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.