Ejector

An ejector comprising,

• (a) a body defining both a cylindrical bore therethrough and a cylindrical throat therethrough normal to the bore;
• (b) an outlet member having a cylindrical portion thereof sealingly located inside one of the ends of the bores and extending to the throat, and having a co-axially extending aperture therethrough to provide an outlet from the throat;
• (c) a first nozzle member having a cylindrical portion thereof sealingly located inside the other end of the bore and extending to the throat, the first nozzle member defining a co-axially extending cylindrical chamber therein with at one end thereof a frusto-conical end portion converging to a relatively narrow cylindrical orifice which connects the chamber to the throat, the other end of the chamber defining an internal screw thread, and an inlet being defined through the side of the first nozzle member for connecting the chamber to a supply of liquid at a relatively low pressure;
• (d) a second nozzle member partially disposed inside the chamber, the second nozzle member comprising a cylindrical body portion sealingly located in the chamber, the body portion having several lobes radially extending to the inside surface of the chamber so as to locate the body portion co-axially with the chamber and define a hollow cylindrical space therebetween, the body portion defining an external screw thread engaged with the internal screw thread of the first nozzle member, and the second nozzle member defining a co-axially extending cylindrical duct therein having at one end thereof a frusto-conical end portion which converges to a cylindrical hole that connects the duct to the chamber adjacent to the orifice of the first nozzle member, the hole being smaller in diameter than said orifice, and the second nozzle member having an externally threaded spigot portion extending from the body portion for connecting the second nozzle member to a supply of a liquid at a relatively high pressure;
• (e) a shut-off valve at one end of the throat, and
• (f) a reservoir connected to the body at the other end of the throat for directing, in operating, a downward feed of a slurry in the reservoir into the throat,
• whereby, in use of the ejector intermittent operation of the second nozzle member in issuing the relatively high pressure liquid therefrom, dislodges any material from the slurry lodging in or adjacent to the outlet.