Imperforate bowl: centrifugal separators – Rotatable bowl – Driven by energy of material supplied
Reexamination Certificate
2000-08-30
2001-11-06
Cooley, Charles E. (Department: 1723)
Imperforate bowl: centrifugal separators
Rotatable bowl
Driven by energy of material supplied
Reexamination Certificate
active
06312372
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a centrifugal separator including a stationary housing, which forms a chamber, and a rotor arranged in the chamber, the rotor being rotatable in a predetermined rotational direction around a rotational axis and adapted for its rotation to receive pressurized liquid and to discharge at least part of this liquid through at least one rotor outlet, situated at a distance from the rotational axis, in a direction such that the rotor is subjected to a reaction force in its circumferential direction as a consequence of outflowing liquid, said chamber being surrounded by a surrounding wall, which constitutes part of the housing and is provided with at least one outlet for liquid.
BACKGROUND OF THE INVENTION
In a centrifugal separator of this kind, known for instance through WO 96/12549, it is desired that the stationary housing is only insignificantly larger than the rotor. Thereby, the air resistance to the rotor rotation within the housing can be made as small as possible. Furthermore, within a given space for the whole centrifugal separator the rotor can, thereby, be made as large as possible and, thus, get a capacity as large as possible.
A circumstance making it difficult to have the stationary housing only insignificantly larger than the rotor is that liquid having left the rotor requires a certain space within the housing around the rotor Particularly if the rotor, as in a preferred embodiment of the present invention, is arranged with its rotational axis extending substantially horizontally, the housing can not be made too small. The reason for this is that part of said surrounding wall in this case forms a bottom of the chamber and that liquid, thereby, may collect and form a pool on this bottom, before it runs out through the outlet in the surrounding wall.
The present invention has for its object to avoid the above described difficulty and to make possible that the housing is made only insignificantly larger than the rotor.
This object can be obtained in that the outlet in the surrounding wall is formed in a way such that liquid is allowed to leave the chamber in a direction substantially opposite to the rotational direction of the rotor. An outlet formed in this way creates possibilities for the liquid to rapidly leave the chamber without forming a space-requiring pool therein, which may disturbed the rotation of the rotor. The invention builds on the circumstance that liquid leaving the rotor gets a component of movement in a direction opposite to the rotational direction of the rotor, not only seen in relation to the rotor but also seen in relation to the housing surrounding the rotor.
Thanks to the invention it becomes possible to arrange the centrifugal separator with the rotational axis of its rotor forming an angle with a vertical axis—even extending horizontally—without the housing around the rotor having to be made substantially larger than the rotor. It is particularly suitable to have the rotor outlet situated at one axial end of the rotor and the outlet in the surrounding wall situated at substantially the same axial level in the chamber as the rotor outlet.
For further acceleration of the liquid outflow from the chamber said surrounding wall preferably extends substantially circularly around the rotor and has, at least along part of its extension axially along the rotor, an increasing diameter in a direction towards the outlet in the surrounding wall.
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patent: 1097370 (1961-01-01), None
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patent: 272727 (1970-06-01), None
patent: 535961 (1976-11-01), None
patent: 1158242 (1985-05-01), None
patent: 9612549 (1996-05-01), None
Hallgren Ingvar
Larsson Leif
Alfa Laval AB
Cooley Charles E.
McCormick Paulding & Huber LLP
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