Imperforate bowl: centrifugal separators – With means for furnishing auxiliary fluid to material or... – Liquid
Patent
1984-12-12
1987-01-06
Jenkins, Robert W.
Imperforate bowl: centrifugal separators
With means for furnishing auxiliary fluid to material or...
Liquid
494 38, 494 56, B04B 1100
Patent
active
046344160
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a centrifugal separator, the rotor of which has an inlet for a fluid mixture of components to be separated within the separating chamber of the rotor, and means for removing one separated component from another during the operation of the rotor.
At previously known centrifugal separators of this kind one of the separated components generally is removed from another by being conducted to a central chamber within the rotor, from where it is removed either through an overflow outlet or through a so called paring member.
This method of removing one separated component from another during the operation of the rotor is not suitable in connection with so called ultra speed centrifugation, i.e. in connection with extremely rapidly rotating rotors. It is also not suitable in connections where the amount of a separated component, that is removed from a rotor, has to be changed during the operation of the rotor, and perhaps sometimes has to be reduced to zero.
One object of the present invention is to provide an outlet arrangement for a centrifugal separator, which during the operation of the centrifuge rotor makes it possible to control easily the amount of separated component that is removed from the separating chamber of the rotor.
Another object of the invention is to provide an outlet arrangement which is suitable for extremely rapidly rotating centrifuge rotors.
A further object of the invention is to provide an outlet arrangement having a relatively small energy consumption, when it is utilized, and substantially no energy consumption at all when it is not utilized.
Finally, one object of the invention is to provide an outlet arrangement by means of which a separated component may be removed from the separating chamber of the rotor in a gentle way without being mixed up with air or other gases surrounding the rotor.
These objects may be fulfilled according to the invention at a centrifugal separator of the initially defined kind by having an outlet member arranged in the rotor such that it is entrained in rotation around the rotor axis during the operation of the rotor by fluid having been supplied to the rotor, by having at least one outlet channel extending radially inwards through the outlet member from a point in the rotor, where one of the separated components is situated, to a place in the rotor where the channel terminates, and by having means arranged to counteract the entrainment of the outlet member to such an extent that the latter will rotate at a smaller velocity than said fluid within the rotor and, thereby, a flow of said separated component is obtained through the outlet channel to a separate member at least partly contained in the rotor and having a cavity forming a reception place for said component.
At a centrifugal separator designed in this way said flow through the outlet channel will come up as a consequence of the overpressure to which the separated component is subjected in the rotor by the prevailing centrifugal force due to the rotation of the rotor. The liquid pressure prevailing within the outlet channel will thus be lower than the liquid pressure in the rotor outside the outlet channel, when the outlet member is caused to rotate at a lower speed than the liquid in the rotor.
Within the scope of the invention said reception place for the separated component may be situated either within or outside the rotor. Thus, the outlet member may extend out of the rotor or only to the centre of the rotor. In the latter case said outlet channel may open into a chamber, which within the rotor is formed by a nonrotating member extending into the rotor.
In one embodiment of the invention, the outlet member extends from the separating chamber to the center of the rotor where the separate member is releasably connected to the outlet member to provide a closed flow path between the two. Thus, when a separated component has been collected in the cavity, the separate member can be easily detached from the outlet member and removed from the rotor.
The invention will be
REFERENCES:
patent: 2344888 (1944-03-01), Lindgren
patent: 3410481 (1968-11-01), Dahlberg
patent: 3426967 (1969-02-01), Roberts
patent: 3468475 (1969-09-01), Thylefors
patent: 4014497 (1977-03-01), Spiewok
Alfa-Laval AB
Hapgood Cyrus S.
Jenkins Robert W.
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