Imperforate bowl: centrifugal separators – Rotatable bowl – Driven by energy of material supplied
Reexamination Certificate
1999-06-30
2001-03-13
Cooley, Charles E. (Department: 1723)
Imperforate bowl: centrifugal separators
Rotatable bowl
Driven by energy of material supplied
C494S075000
Reexamination Certificate
active
06200252
ABSTRACT:
The present invention relates to centrifugal rotors for cleaning of a liquid from solid or liquid particles suspended therein. More particularly the invention concerns a centrifugal rotor for this purpose, which comprises a casing surrounding both a separation chamber and an outlet chamber and including two axially spaced end walls and a surrounding wall situated axially therebetween; an annular partition arranged within the casing coaxially with the rotor in a way such that its one side faces axially towards said separation chamber, which is situated between the partition and one of said end walls, and its other side faces towards said outlet chamber, which is situated between the partition and the other one of said end walls, the separation chamber communicating with the outlet chamber through a space at a radially inner part of the partition; an inlet device adapted to receive pressurized liquid to be cleaned and to conduct this into the separation chamber; and an outlet device for discharging cleaned liquid from the rotor through outlets which are situated at a distance from its rotational axis and are directed in a way such that the rotor upon outflow of liquid through the outlets is subjected to a reaction force in its circumferential direction, the casing on parts of its inside delimiting the outlet chamber having two or more niches, which are situated at a distance from each other seen in the circumferential direction of the rotor and from which said outlet starts. The niches are usually formed in said other one of the casing end walls but can alternatively be formed in the surrounding wall of the casing.
BACKGROUND OF THE INVENTION
Centrifugal rotors of this kind are known for instance through EP 0728042 B1, U.S. Pat. No. 5,683,342, U.S. Pat. No. 5,707,519 and WO 97/23296.
SUMMARY OF THE INVENTION
The object of the present invention is to make possible by simple means an improvement of the separation efficiency of a centrifugal rotor of the defined kind.
For obtaining of this object the invention suggests that a centrifugal rotor of the initially defined kind is provided with at least one liquid entrainment member arranged between the partition and said other one of the end walls of the centrifugal rotor for entrainment in the centrifugal rotor rotation of liquid present the outlet chamber.
By such entrainment of liquid, which is on its way radially outwardly in the outlet chamber to the level of said outlets, large slipping or sliding losses may be avoided. Hereby, it is achieved that a larger part than otherwise of the overpressure which the liquid has in the centrifugal rotor may be used for the driving of the centrifugal rotor, i.e. a somewhat higher rotational speed of the centrifugal rotor can be achieved.
Liquid entrainment members may be formed in different ways for achievement of the desired result. Preferably, liquid entrainment members may be used having mutually different forms.
Preferably, a liquid entrainment member is formed such that in the area thereof in the outlet chamber it substantially completely prevents liquid flow relative to the rotor in the circumferential direction thereof. The liquid entrainment member may have the form of a wing or the like.
In a preferred embodiment of the invention a liquid entrainment member of the kind just mentioned is arranged in the area of each one of said niches, covering substantially the whole flow area in the outlet chamber, seen in the circumferential direction of the centrifugal rotor. Preferably, the liquid entrainment member extends also out into the relevant niche. Alternatively, the liquid entrainment member may be arranged adjacent to the niche, either in front of or behind it, seen in the rotational direction of the centrifugal rotor.
In the areas between the niches, seen in the circumferential direction of the centrifugal rotor, spaces have to be present for liquid flow to and into the niches from various parts of the outlet chamber. If desired, liquid entrainment members may be present also in these areas, but in this case they should only impede and not prevent liquid flow in the circumferential direction of the centrifugal rotor.
If no liquid entrainment members are arranged to substantially completely prevents liquid flow in the circumferential direction of the centrifugal rotor, e.g. in the areas of said niches, several liquid entrainment members distributed around the rotational axis of the centrifugal rotor may be adapted to accomplish together a desired sliding or slipping preventing effect in the outlet chamber.
Liquid entrainment members, which do not bridge the whole distance between the partition and said other one of the end walls of the casing, preferably extend in a radial direction from the inner edge of the partition only out to the radial level at which the outlets of the centrifugal rotor are situated in said niches.
All of the liquid entrainment members are preferably formed in one piece with said partition. Alternatively, they may of course be formed in one piece with some part of the casing or be carried by a separate annular member arranged in the outlet chamber between the partition and the casing end wall.
REFERENCES:
patent: 4787975 (1988-11-01), Purvey
patent: 5637217 (1997-06-01), Herman et al.
patent: 5683342 (1997-11-01), McNair
patent: 5707519 (1998-01-01), Miller et al.
patent: 5785849 (1998-07-01), Mules
patent: 0 728 042 B1 (1998-06-01), None
patent: 633609 (1978-11-01), None
patent: WO 97/23296 (1997-07-01), None
Hallgren Ingvar
Larsson Leif
Moberg Hans
Alfa Laval AB
Cooley Charles E.
Fish & Richardson P.C.
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