Imperforate bowl: centrifugal separators – With means for furnishing auxiliary fluid to material or... – Liquid
Patent
1986-06-02
1987-12-01
Jenkins, Robert W.
Imperforate bowl: centrifugal separators
With means for furnishing auxiliary fluid to material or...
Liquid
494 40, 494 56, B04B 1100
Patent
active
047101598
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a centrifugal separator the rotor of which has an inlet for a mixture of components to be separated, a first central outlet for a separated light liquid component, a second central outlet for a separated heavy liquid component, and one or more periphery outlets arranged during the operation of the rotor to be opened intermittently, said second central outlet comprising an overflow outlet arranged to maintain a free liquid surface of the separated heavy liquid component at a predetermined level within the rotor.
Centrifugal separators of this kind, known for instance by the Swedish patent specification No. 348.121 (corresponding to U.S. Pat. No. 3,752,389), are used among other things for cleaning oil from water and solids. As can be seen from said patent specification the rotor of the known centrifugal separator has a radially inwards open annular chamber situated axially outside the overflow outlet for the separated heavy liquid component, a stationary paring member being arranged successively to pump out from the rotor heavy liquid component entering the annular chamber through the overflow outlet.
Immediately before the periphery outlets are to be opened for discharge of separated solids from the separating chamber of the rotor, it is common in connection with centrifugal separators of the kind here in question to charge the rotor with a so called displacement liquid in order to displace separated light liquid component present in the separating chamber some distance radially inwards (see for instance the German patent specification DAS No. 23 63 741). The reason therefore is to reduce or avoid loss of separated light liquid component through the periphery outlets, when these are opened for the discharge of separated solids.
In order to enable displacement of the separated light liquid component upon supply of displacement liquid a valve in the outlet channel of the above mentioned paring member has to be closed or at least throttled, so that the free liquid surface in the annular chamber outside the overflow outlet may move to a level radially inside the overflow outlet.
It is thus required in a centrifugal separator of the kind now described for the displacement of the separated light liquid component, firstly, a paring member, secondly, a closing or throttling valve and, thirdly, control equipment for actuation of the valve. None of these means is fulfilling any function for the main purpose of the centrifugal separator, for instance to clean oil from water and solids.
The object of the present invention is to provide a centrifugal separator which is more simple than the described known centrifugal separator, i.e. a centrifugal separator enabling displacement of the separated light liquid component without the need of a paring member for the separated heavy liquid component, and without the need of a valve in the outlet channel of such a paring member, and its control equipment.
This object is obtained according to the invention by a centrifugal separator of the initially defined kind, which is characterized in that the rotor has an axially movable slide which is arranged to open and close, respectively, said second central outlet for the separated heavy liquid component, that the rotor has a further overflow outlet which is situated radially inside the above said predetermined level within the rotor and which is arranged to admit outflow of separated heavy liquid component from the rotor, when the slide is situated in its closing position.
The further overflow outlet in a centrifugal separator according to the invention is necessary for avoiding the risk that separated heavy liquid component should leave the rotor through the outlet for separated light liquid component. It is not necessary, however, that so much displacement liquid is supplied to the rotor in connection with opening of the periphery outlets of the rotor that the further overflow outlet is taken use of, i.e. that separated heavy liquid component does leave the rotor through the further overflow outlet
REFERENCES:
patent: 3825176 (1974-07-01), Hemfort
patent: 3825177 (1974-07-01), Hemfort
ALFA-Laval Separation AB
Hapgood Cyrus S.
Jenkins Robert W.
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