# US 4,396,355 A · Ejector

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- Number: US 4,396,355 A
- Document ID: US4396355A
- Status: Granted
- Kind: A
- Application number: 06/226,131
- Filed: 1981-01-19
- Granted: 1983-08-02
- Earliest claimed: 1980-01-28
- Assignees: United Kingdom Atomic Energy Authority
- Inventors: Charles K. S. Wilmot; Claude L. Stockwell; Victor R. Phillips
- Web page: https://patentgrep.com/patent/US4396355A

## CPC

- F04F 5/44: Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
- B65G 53/30: Conveying materials in bulk through pipes or tubes by liquid pressure
- F04F 5/467: {with a plurality of nozzles arranged in series}
- Y10S 417/90: Slurry pumps, e.g. concrete
- F04F: PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED {(evacuating by sorption F04B)}; SIPHONS {(conveying materials in bulk by flows of gas, liquid of foam B65G53/00)}
- B65G: TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS (packaging B65B; handling thin or filamentary materials, e.g. paper sheets or thread, B65H; cranes B66C; portable mobile or lifting or hauling appliances, e.g. hoists, B66D; devices for lifting or lowering goods for loading or unloading purposes, e.g. fork-lift trucks, B66F9/00; emptying bottles, jars, casks, barrels or similar containers, not otherwise provided for, B67C9/00; delivering or transferring liquids B67D; filling or discharging vessels for liquefied, solidified or compressed gases F17C; pipe-line systems for fluids F17D)
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

An ejector 110 having an additional nozzle 173 for issuing a fluid at a relatively high pressure through a throat 113 of the ejector 110 into an outlet 114 from the throat 113, so as to clear any material lodging in the outlet 114 and/or the throat 113. The additional nozzle 113 may be co-axial with the main nozzle 140 of the ejector 110, or angularly disposed from it.

## Claims

### Claim 1

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.

### Claim 2 (depends on 1)

An ejector as claimed in claim 1, wherein the second nozzle member has a said hole for the issuance of the relatively high pressure liquid therefrom of about 0.4 mm diameter.

### Claim 3 (depends on 1)

An ejector as claimed in claim 1, wherein there is provided a third nozzle member which is angularly disposed from the first nozzle member, for issuing the relatively high pressure liquid through said throat portion at said outlet.