(19)
(11) EP 0 889 244 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
25.08.1999 Bulletin 1999/34

(43) Date of publication A2:
07.01.1999 Bulletin 1999/01

(21) Application number: 98305146.7

(22) Date of filing: 29.06.1998
(51) International Patent Classification (IPC)6: F04F 5/10, F04F 5/46
(84) Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 30.06.1997 GB 9713822

(71) Applicant: USF Limited
Hertford SG13 7NW (GB)

(72) Inventor:
  • Stolberg, Errol Michael
    Greenford, Middlesex UB6 9NY (GB)

(74) Representative: Rackham, Stephen Neil 
GILL JENNINGS & EVERY, Broadgate House, 7 Eldon Street
London EC2M 7LH
London EC2M 7LH (GB)

   


(54) Ejector


(57) An ejector for mixing and ejecting two or more fluids comprises a nozzle (2) having a generally conical outer surface (4); a first fluid inlet (5) through which a first fluid is supplied to the nozzle (2) under pressure; a throttle (8) for controlling the cross-sectional area of the outlet of the nozzle (2); an ejector throat (9) having a generally conical inner surface which surrounds and is downstream of the generally conical outer surface (4) of the nozzle (2); and, a second fluid inlet (10) through which a second fluid is supplied in communication with the ejector throat (9). The first fluid is jetted through the nozzle (2) into the ejector throat (9) and draws the second fluid into the ejector throat (9) from where the first and second fluids are ejected. With this arrangement, the flow rate of the jetted fluid through the nozzle can be controlled by varying the cross-sectional area of the opening of the nozzle (2) using the throttle (8) without reducing the velocity of the jet of the first fluid.






Search report