Imperforate bowl: centrifugal separators – Rotatable bowl – Including discharge-related structure in nature of static...
Patent
1996-03-22
1998-01-20
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
057096430
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention concerns a centrifugal separator comprising a rotor, which is rotatable around a rotational axis and inside itself forms an inlet chamber for the liquid to be centrifugally treated, a separation chamber, which is connected to the inlet chamber, and an outer chamber, which via a passage communicates with the separation chamber for the reception of a liquid separated during operation in the separation chamber, and which is so designed that a liquid present therein during operation forms a rotating liquid body with a radially inwardly directed free liquid surface. The outlet chamber is provided with an outlet, which is located radially outside the free liquid surface. In the outlet chamber at least two wall elements extending radially and axially are arranged fixedly connected to the rotor and arranged to form a channel them between to entrain during operation the separated liquid into the rotation of the rotor and at the same time admit a flow of the same radially outwardly in the outlet chamber.
BACKGROUND OF THE INVENTION
In a known centrifugal separator of this kind the outlet chamber is separated from the separation chamber by means of a dividing wall, through which the passage is so arranged that it opens radially inside the free liquid surface. The outlet, which is connected to the outlet chamber, is in the known centrifugal separator formed in a stationary disc shaped outlet device, which has a portion arranged in the outlet chamber, which has internal channels, with which it extends from a central portion of the outlet chamber radially outwards to the portion of the outlet chamber, in which the rotating liquid body is located during operation. In this centrifugal separator also radially wings having an axial and radial extension are arranged in the outlet chamber fixedly connected to the dividing wall to entrain the separated liquid located in the outlet chamber into the rotation of the rotor.
The liquid present in the outlet chamber then will be in contact with the entraining wings and in contact with the portion of the stationary outlet device, which extends radially outside the free liquid surface of the rotating liquid body. Thereby the outlet device slows down the rotation of the liquid body while the wings entrain the liquid body into the rotation of the rotor. Thus, different portions of the liquid body obtain different rotation speeds and are influenced by different centrifugal forces. This results in an internal circulation in the outlet chamber, the separated liquid flowing radially inwardly along the outside of the outlet device and radially outwardly along the wings. The flow speed of the liquid at the free liquid surface can be considerable, which results in a great risk for air or another gas, which is located radially inside and in contact with the free liquid surface in the outlet chamber, to be admixed in the separated liquid and be entrained in its flow along the wings and further out through the internal channels in the outlet device.
As a consequence of the fact that the passage through the dividing wall opens into the outlet chamber radially inside the free liquid surface the risk for air admixture increases as a result of the collision taking place when the separated liquid entering into the outlet chamber is thrown out by the centrifugal force from the passage radially outwardly towards either the free liquid surface or the wings in the outlet chamber.
In order to entrain the separated liquid in the outlet chamber in a gentle manner it has, as shown in WO 89/03250 A1, been suggested in a centrifugal separator of this kind to design the entraining members in the shape of at least one disc fixedly connected to the rotor. Hereby, the radially outwardly directed flow is distributed in large layers, whereby the flow speeds at the free liquid surface become lower and the risk of air admixture becomes lower. However, it shows that the capability of the discs to entrain the separated liquid in the outlet chamber into the rotation of the
REFERENCES:
patent: 2435623 (1948-02-01), Forsberg
patent: 5518494 (1996-05-01), Borgstrom et al.
patent: 5599271 (1997-02-01), Eiken
Borgstrom Leonard
Carlsson Claes-Goran
Franzen Peter
Inge Claes
Lagerstedt Torgny
Alfa Laval Separation AB
Cooley Charles E.
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