Imperforate bowl: centrifugal separators – Rotatable bowl – Including discharge-related structure in nature of static...
Patent
1997-11-12
1998-08-04
Cooley, Charles E.
Imperforate bowl: centrifugal separators
Rotatable bowl
Including discharge-related structure in nature of static...
494 70, B04B 108, B04B 1108
Patent
active
057886229
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an outlet device for a centrifugal rotor that is rotatable around a rotational axis and that delimits a chamber which is formed such that a liquid present therein forms upon rotation of the centrifugal rotor a liquid body having a free liquid surface facing towards and surrounding the rotational axis. The outlet device comprises, firstly, an outlet member which forms an outlet channel and an inlet opening communicating therewith and which is adapted during operation of the centrifugal rotor to be turnable around a turning axis extending substantially in parallel with said rotational axis at some distance therefrom, so that the outlet member is movable in a direction towards or away from the rotational axis of the centrifugal rotor, the outlet member further being formed such that in different turning positions around said turning axis it extends from a liquid free part of said chamber out into the liquid body present therein through said free liquid surface and, secondly, actuation means arranged to actuate the outlet member by a controlled force striving at turning the outlet member around said turning axis in a direction away from the rotational axis of the centrifugal rotor, so that the outlet member, against the action of forces which are exerted thereon by the liquid body rotating with the centrifugal rotor, is held with its inlet opening situated at least partly in the liquid body at varying radial levels of the free liquid surface.
An outlet device of this kind is advantageous because the radially movable outlet member can be brought to accompany radial movements of the free liquid surface in the centrifugal rotor automatically. If desired, this may be used for sensing of the radial position of the liquid surface, or be used only for minimizing the energy consumption caused by the outlet member by its contact with the rotating liquid body. The depth of immersion of the outlet member in the rotating liquid body, thus, may be maintained unchanged independent of the radial position of the liquid surface.
Another advantage with a radially movable outlet member is that upon need the outlet member may be used for a desired adjustment of the radial position of said liquid surface.
BACKGROUND OF THE INVENTION
Previously known outlet devices of the kind here defined, described for instance in DE 656 125 and DE 39 40 053-A1, are not designed in a way making possible a maximum use of said advantages of a radially movable outlet member. Thus, both of the two outlet members shown and described in said two German patent specifications have a form causing a relatively large energy consumption even if the outlet members have a relatively small depth of immersion in the rotating liquid body. Further, the two previously known outlet members are arranged in a way making them instable as level sensing means. Thus, they will not operate satisfactorily if sudden disturbances come up in the rotation of said liquid body, e.g. upon swinging or pendulum movements of the centrifugal rotor. In connection with movements of this kind those forces exerted by the rotating liquid body on the outlet member change very rapidly and, given the design of the previously known outlet members, this may mean that the rotating liquid would press the outlet member much deeper into the liquid body than is desired. This may cause too large oscillations in the radial movements of the outlet member, which do not correspond to the radial movements of the liquid surface itself and which, therefore, do not give a correct signal about the actual radial position of the liquid surface.
SUMMARY OF THE INVENTION
The object of the present invention is to provide an outlet device of the general kind initially defined, which is not connected with the disadvantages of previously known outlet devices just described.
This object may be obtained by the invention if in an outlet device of the initially defined kind the outlet member has a shape such that during operation of the centrifugal rotor it e
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Borgstrom Leonard
Carlsson Claes-Goran
Franzen Peter
Inge Claes
Lagerstedt Torgny
Alfa-Laval AB
Cooley Charles E.
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