Centrifugal separator

Details Centrifugal separator Centrifugal separator

1990-05-14

1991-09-03

Jenkins, Robert W.

Imperforate bowl: centrifugal separators

Rotatable bowl

Including structure located within vertically-oriented bowl...

B04B 108

Patent

active

050450492

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to a centrifugal separator comprising a rotor having a central inlet chamber for a liquid mixture of components to be separated and a separating chamber surrounding the inlet chamber and containing a stack of at least partly conical separation discs arranged axially spaced from each other and coaxially with the rotor and having radially inner and outer edges, the spaces between the separation discs having inlets for mixture at the radially inner edges of the separation discs, which inlets communicate with said inlet chamber, and outlets for separated components radially outside the inlets, so that mixture as well as components separated therefrom are allowed to flow radially outwards between the separation discs during the operation of the rotor.
A centrifugal separator of this kind is shown for instance in U.S. Pat. No. 2,488,747. In this known centrifugal separator the centrifuge rotor forms a lower separation chamber of the kind described above and an upper separation chamber which communicates with the former one radially outside the separation discs. The upper separation chamber is arranged for further treatment of liquid having already flowed through the lower separation chamber.
The centrifugal separator according to U.S. Pat. No. 2,488,747 could be improved by the use of members for entrainment of mixture supplied to the central inlet chamber of the rotor, which members are more gentle to the mixture than usually used entrainment members consisting of wings extending axially and radially within the inlet chamber. Thus, a technique described in U.S. Pat. No. 2,302,381 and U.S. Pat. No. 4,721,505 could be used, according to which mixture entering the inlet chamber is gently accelerated to the rotational speed of the rotor by means of smooth discs. In practice this could be accomplished in a way such that the radially inner portions of the separation discs in a centrifugal separator of the initially defined kind would be used for acceleration of entering mixture to the rotational speed of the rotor.
An advantage of an acceleration technique of this kind, as it is described in U.S. Pat. No. 4,721,505, is that the acceleration effect of the acceleration discs as used is automatically adapted to the magnitude of the flow with which mixture is introduced into the inlet chamber, a larger or smaller number of the acceleration discs being used. This feature, meaning in connection with relatively small flows of mixture entering the inlet chamber the spaces between part of the acceleration discs are only partly filled and are not being flowed through by the mixture, can not be accepted, however, in connection with a centrifugal separator of the initially defined kind. This would mean, namely, that in connection with a relatively small inflow of mixture entering the inlet chamber part of the spaces between the separations discs would not be used for separation.
The object of the present invention is to accomplish in a centrifugal separator of the initially described kind the use of the above described acceleration technique, the separation discs being used as acceleration discs in a way such that the whole separation chamber is used effectively even at relatively small inflow of mixture entering the inlet chamber.
This object is achieved by the features that the spaces between the separation discs are open towards and communicate directly with the inlet chamber around all of the rotor axis, and that at least some of the separation discs have axially extending through holes situated radially inside said outlets of the spaces between the separation discs and at a distance from the radially inner edges of the separation discs, that is smaller than the distance between the holes and the radially outer edges of the separation discs.
Thereby, mixture entrained in rotation may be distributed substantially evenly in the spaces between the separation discs even if part of these spaces are not filled with liquid up to the radially inner edges of the separation discs, i.e. cannot receive mixt

REFERENCES:
patent: 1168452 (1916-01-01), Anderson
patent: 2469956 (1949-05-01), Fawcett
patent: 2500100 (1950-03-01), Strezynski
patent: 3335946 (1967-08-01), Putterlik

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