(19)
(11) EP 0 447 742 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
18.12.1991 Bulletin 1991/51

(43) Date of publication A2:
25.09.1991 Bulletin 1991/39

(21) Application number: 91100071.9

(22) Date of filing: 02.01.1991
(51) International Patent Classification (IPC)5B04B 1/20
(84) Designated Contracting States:
AT BE CH DE DK ES FR GB GR IT LI LU NL SE

(30) Priority: 19.03.1990 JP 69019/90

(71) Applicant: BAKER HUGHES INC. by and through its BIRD MACHINE COMPANY DIVISION
South Walpole, Massachusetts (US)

(72) Inventors:
  • Nishida, Katsunori
    Hoya-shi, Tokyo (JP)
  • Sano, Hiroshi
    Kawasaki-shi, Kanagawa-ken (JP)
  • Ichinose, Eiji
    Yokohama-shi, Kanagawa-ken (JP)
  • Dr.Shapiro, Ascher H.
    Jamaica Plain, MA 02130 (US)

(74) Representative: Neidl-Stippler, Cornelia, Dr. 
Rauchstrasse 2
D-81679 München
D-81679 München (DE)


(56) References cited: : 
   
       


    (54) Decanter centrifuge


    (57) A decanter centrifuge used for solid-liquid separation of a feed solution containing suspended solids. According to a preferred embodiment, plural number of clarified liquid discharge ports (4) are formed on a bowl-head (3) of a rotating bowl (1). On the other hand, a ring-shaped weir (5) is mounted on the bowl-head (3), coaxially has a ring-shaped overflow cavity communicating with each liquid discharge port (4) and is provided with a peripheral opening directing the rotative axis of the bowl-head. Additionally, plural number of reducing blades (6) are provided in the ring-shaped overflow cavity in a radial form from the rotative axis of the bowl-head. Then, the cavity is divided into plural number of portions while each reducing blade (6) is fixed to the inner face of the ring-shaped weir (5). Due to the reducing blades, appropriate quantity of the clarified liquid is overflown.







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