A vortex finder, for a cyclonic separator, includes a plurality of stationary vanes having a round convex front end around which incoming air is guided into the vortex finder, wherein, where air separates from the plurality of stationary vanes inside of the vortex finder, a cross-section of the plurality of stationary vanes has only one sharp edge. Preferably, a mean line of the cross-section of the plurality of stationary vanes does not cross a chord line in an upstream half of the cross-section. Preferably, a side of the plurality of stationary vanes facing the incoming air is provided with a protrusion at a stagnation point. The protrusion may be shaped so as to guide the incoming air into the vortex finder, and may have a concave side following a shape of a neighboring vane, and a rounded top.

The invention relates to a vortex degassing device (1) for a fluid transfer circuit (F1, F2), in particular of a motor vehicle, this device (1) comprising: a first internal chamber (10) connected to a first inlet (11) for a fluid (F1) as well as to a first outlet (12) for a liquid fraction and to a second outlet (13) for a gaseous fraction, a second internal chamber (20) connected to a second inlet (21) for a fluid (F2) as well as to a third outlet (22) for a liquid fraction and to a fourth outlet (23) for a gaseous fraction,
the second chamber (20) being located above the first chamber (10) and the second outlet (13) extending through the second chamber (20) to the level of the fourth outlet (23).

The invention also relates to a fluid transfer circuit comprising at least one such device (1) as well as a method for using such a device (1).

Hydrocyclones and related apparatus, systems and methods are disclosed for classifying aggregate material. Some embodiments include an inlet head with a spiral inlet having a height and width that vary along the direction of travel of material in the inlet head. Plants incorporating hydrocyclones are disclosed for classifying aggregate material. Some plant embodiments include an overflow container having a weir.

There is provided a method of forming a hydrocyclone body including assembling sintered alumina blocks (27) against a form (37), holding the blocks (27) in place with tape (40), locating a hydrocyclone housing over the blocks (27), filling a space between them with settable epoxy/ceramic composite to secure the blocks (27) to the casing, and removing the form (37), resulting in a substantially continuous, wear resistant surface.

A centrifugal gas-liquid separator wherein a tubular casing houses a central tubular duct, which is provided with a first free end and with a second end that communicates with a gas-outlet duct and carries a transversal annulus-shaped plate having a perimetral edge that faces the inner wall of the tubular body to define an annular gap. The plate divides the space inside the tubular casing into a first chamber and into a second chamber that communicate with each other through the annular gap. A liquid-outlet duct communicates with the second chamber and a liquid-phase/gas-phase inlet duct extends tangentially from the tubular casing and discharges into the first chamber through an inlet nozzle. A regulation device is provided, which is designed to modify the section of the inlet nozzle in order to modify the rate of entry of the liquid phase and gas phase into the first chamber and to adapt the operation of the centrifugal gas-liquid separator following variations of flow rate.

Liquid separator provided with a housing which includes an at least partially cylindrical wall defining a separation chamber, closed at one end by a base and at the other end by a lid in which there is a gas outlet for the discharge of the treated gas. A shield is provided in the separation chamber surrounding the gas outlet in the separation chamber from the aforementioned lid. The liquid separator has an inlet for a liquid-gas mixture to be treated. The inlet is located in the lid so that the liquid-gas mixture tangentially enters the separation chamber in the space between the wall and the shield.

A wastewater purification system that uses mechanical and chemical processes to separate contaminants from municipal and other sanitary wastewater, concentrates the resulting sludge for disposal, and purifies the resulting product water for reuse as irrigation water, potable water or for disposal. The wastewater purification system can be scaled from a mobile system mounted on a skid or a tracker trailer to a large municipal wastewater treatment system. The wastewater purification system can include a hydrocyclone feeding a flotation tank. Flocculant is added upstream from the hydrocyclone after air injection by a Venturi air injector or similar device. Coagulant is added before the air injection. A dose of flocculant is added after the hydrocyclone within the vortex of the hydrocyclone and before the wastewater exits near the top of the flotation tank.

According to examples, a 3D printing system may include a feed line to receive build material particles from a material bin, an air pressure generator to generate airflow inside the feedline to move the build material particles through the feedline, and a cyclone separator to receive the airflow and the build material particles from the feed line and to separate the build material particles from the airflow. The cyclone separator may include a chamber wall, a build material particle discharge opening, and a tapered wall connecting the chamber wall and the build material particle discharge opening. In addition, a ratio between a diameter of the chamber and a diameter of the discharge opening may be between about 1.5 and about 4.0.

According to examples, a 3D printing system may include a feed line to receive build material particles from a material bin, an air pressure generator to generate airflow inside the feedline to move the build material particles through the feedline, and a cyclone separator to receive the airflow and the build material particles from the feed line and to separate the build material particles from the airflow. The cyclone separator may include a chamber wall, a build material particle discharge opening, and a tapered wall connecting the chamber wall and the build material particle discharge opening. In addition, a ratio between a diameter of the chamber and a diameter of the discharge opening may be between about 1.5 and about 4.0.

Disclosed is a liquid-liquid-solid three-phase separator for waste oil, including an oil-bath heating tank, a plurality of cyclone units and solid removal units. The cyclone units are provided and fixed in the oil-bath heating tank. Each of the solid removal units is connected to an underflow pipe of each of the cyclone units and is configured to separate solid particles. A solid removal outer pipe is arranged at a tail end of the underflow pipe via the first connector; the second connector is arranged at a tail end of the solid removal outer pipe; the solid removal inner pipe is arranged at an underflow outlet of the underflow pipe via the second connector to form a solid removal gap. The invention provides the demulsification and dehydration treatment of waste oil emulsion and the separation of solid particles.