Centrifugal separator

Details Centrifugal separator Centrifugal separator

1989-02-02

1990-08-21

Jones, W. Gary

Liquid purification or separation

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Movable medium

494 18, 494 56, 494 84, B04B 500

Patent

active

049504010

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to a centrifugal separator comprising a rotor body, which is rotatable around an axis and has two axially separated ends, an elongated flexible member forming a separation chamber within the rotor at a distance from said axis and being arranged in a cavity in the rotor body, in which it is arranged to rotate together with the rotor body immovable relative thereto, and means for rotating the flexible member around its longitudinal axis relative to the rotor body during the rotation of the latter, the flexible member further forming an inlet channel extending from the axis of the rotor body to an inlet part of the separation chamber, and an outlet channel extending from an outlet part of the separation chamber to the rotor body axis.
In the Swedish patent No. 352 540 there is shown a centrifugal separator of this kind having an axially elongated rotor and a flexible member in the form of an ordinary hose. The hose extends through a cavity of the rotor body from said axis at one end of the rotor body via a peripheral part of the rotor body and back to the axis at the other end of the rotor body.
The centrifugal separator thus known is intended for batchwise centrifugation of a liquid mixture. The mixture may be sucked into the hose from one of its ends, and after completed separation the separated components of the mixture may be removed from the hose one at the time through one of the hose ends.
The object of the present invention is to provide a centrifugal separator of the initially defined kind, which is more suited than the known centrifugal separator for continuous operation, can be given substantially larger capacity and better separation efficiency than this, and enables a very gentle supply and discharge of liquid.
This object is obtained according to the invention in that the separation chamber is elongated and extends with its longitudinal axis in the circumferential direction of the rotor body, that said inlet channel and outlet channel extend from the separation chamber to the same end of the rotor body, and that the flexible member and the inlet and outlet channels defined therein extend out from the last mentioned end of the rotor body and its axis and further around the periphery of the rotor body to a place opposite to the other end of the rotor body at the same axis.
The described extension of the flexible member outside the rotor makes it possible to conduct liquid therethrough to and from the rotor body while it is rotating, without use of a rotational coupling between the rotor and a stationary conduit for liquid. This technique is known per se by for instance by the U.S. patent specifications 3,358,072 and 3,586,413.
In one embodiment of the invention the flexible member is constituted by a hose extending without interruption with a first part from said place outside the rotor body, through said end of the rotor body, to the separation chamber, with a second part within the cavity of the rotor body, said second part forming the separation chamber, and with a third part from the separation chamber through the said end of the rotor body and further back to said place outside the rotor body. In this embodiment both of the hose portions outside the rotor body have to be rotated in opposite directions around their respective longitudinal axes, when the hose portion within the rotor is to be rotated relative to the rotor body.
In a preferred embodiment of the invention, which makes it easier to rotate the flexible member while the rotor body is rotating, the flexible member comprises two channels extending side by side all the way from said place outside the rotor, via said end of the rotor body, to said cavity of the rotor body, in which the two end portions of the channels extend in the circumferential direction of the rotor body and form respective parts of the separation chamber, the channels communicating with each other at their ends within the rotor body.
Preferably the flexible member itself forms the two channels, i.e. the flexible member has the form for

REFERENCES:
patent: 3817449 (1974-06-01), Westberg et al.
patent: 4356958 (1982-11-01), Kolobow et al.
patent: 4372484 (1983-02-01), Larsson et al.
patent: 4459169 (1984-07-01), Backhowski et al.
patent: 4778444 (1988-10-01), Westberg et al.

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