Imperforate bowl: centrifugal separators – Rotatable bowl – Including structure located within vertically-oriented bowl...
Patent
1997-10-16
1999-08-24
Cooley, Charles E.
Imperforate bowl: centrifugal separators
Rotatable bowl
Including structure located within vertically-oriented bowl...
B04B 108, B04B 714
Patent
active
059418117
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a centrifugal separator which is particularly designed for freeing a liquid, e.g. water, from both suspended light particles, e.g. oil drops, having a smaller density than the liquid, and suspended heavy particles, e.g. solids, having a larger density than the liquid.
BACKGROUND OF THE INVENTION
A starting point for the invention has been a centrifugal separator, which has a rotor for rotation around a central axis extending through the rotor and in which arranged axially one on each side of a separation chamber surrounding the rotor axis, forms a central inlet for said liquid containing the suspended light and heavy particles, a central first outlet through said first end wall for liquid having been freed from light and heavy particles and a central second outlet for a liquid light phase containing separated light particles, in a way such that the separation discs, which have base portions and apex portions and are arranged spaced from each other, are arranged coaxially with the rotor and have their apex portions facing said first end wall, central axis and which connect the central inlet of the rotor body with the separation chamber, has an inclination relative to the central axis in the same direction as a generatrix of each one of the conical separation disc, parallel distribution channels through said stack, which communicate with the inter-spaces between the separation discs and at their ends situated closest to said first end wall communicate with said inlet channels, and rotor axis and intended for liquid having been freed from light and heavy particles, has a channel opening situated in the separation chamber close to said first end wall and extending from said channel opening towards the rotor axis.
A centrifugal separator of this kind, known for instance from SE-19 666 and SE-21 885 (both granted in 1904), has certain advantages over other centrifugal separators. One advantage lies in the fact that liquid to be treated in the centrifugal separator is introduced into the separation chamber of the rotor at the rotor end wall faced by the apex portion of the separation discs. This makes possible an effective use from a separation point of view of said inlet channels, which extend between the central inlet of the rotor and the so called distribution channels in the stack of separation discs. Thus, thanks to the inclination of these inlet channels in relation to the rotor axis, the pre-separation of the liquid obtained in the inlet channels may be used to a maximum, i.e. the result of this pre-separation is not spoiled by an undesired cross-flow of the part flows of the liquid, which are obtained through the pre-separation, when this liquid is conducted further into said distribution channels. A cross-flow of this kind would be obtained, however, if the liquid would be conducted into the distribution channels at the opposite end of the separation disc stack after having flowed through corresponding inlet channels having the same inclination relative to the central axis in this part of the rotor.
Another advantage of a centrifugal separator of the described kind is that liquid conducted into the separation chamber in the above described manner can preferably be supplied to the rotor through the rotor body end wall at which said inlet channels are situated. Thus, the liquid need not be conducted axially through the whole of the rotor before it enters the separation chamber, which most often happens today in centrifugal rotors having frusto-conical separation discs. This is advantageous particularly in connection with rotors having relatively small dimensions and having their respective two end walls kept together axially by means of force absorbing members arranged centrally in the rotor.
SUMMARY OF THE INVENTION
The object of the present invention has been to improve a centrifugal separator of the kind just described in a way such that it can free the treated liquid from suspended heavy particles even more effectively than has been possibl
REFERENCES:
patent: 1283343 (1918-10-01), Snyder
patent: 2478992 (1949-08-01), Wheelwright, Jr.
patent: 2726808 (1955-12-01), Fitzsimmons
patent: 4930412 (1990-06-01), Stroucken
patent: 5676631 (1997-10-01), Kunz et al.
Ridderstr.ang.le Rolf
Stroucken Klaus
Alfa Laval AB
Cooley Charles E.
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