Centrifugal separator

Details Centrifugal separator Centrifugal separator

1990-05-14

1991-10-01

Jenkins, Robert W.

Imperforate bowl: centrifugal separators

Rotatable bowl

Including structure located within vertically-oriented bowl...

494 76, B04B 108

Patent

active

050529960

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to a centrifugal separator for the separation of different components of a liquid mixture thereof, comprising a rotor having a separation chamber, a stack of frusto-conical separation discs arranged in spaced relation to each other in the separation chamber coaxially with the rotor, means defining centrally in the stack of the separation discs radially inside thereof an inlet chamber for said mixture, which inlet chamber is closed from connection with the separation chamber along the axial extension of said stack but communicates with the separation chamber at least at one end of the stack, inlet means for introducing liquid mixture into the inlet chamber and annular acceleration discs placed coaxially with the rotor in the inlet chamber and arranged for gradual entrainment of incoming mixture in the rotation of the rotor. A centrifugal separator of this kind is shown for instance in U.S. Pat. No. 4,701,1578.
The use of acceleration discs of the above defined kind in the inlet chamber of a centrifuge rotor means an increase of the cost for the centrifuge rotor. This depends on costs for the acceleration discs themselves, for necessary means for fastening of the discs in the centrifuge rotor and for work with mounting of the discs in the centrifuge rotor.
The object of the present invention is to provide a new rotor design which is less complicated than the one to be seen from said U.S. Pat. No. 4,701,158 and which makes it possible to produce centrifuge rotors having acceleration discs to a lower cost than would be allowed by the rotor design according to U.S. Pat. No. 4,701,158.
This object may be achieved by designing a centrifugal separator of the initially defined kind such that each of at least some acceleration discs is made in one piece with a separation disc, so that a combination disc is formed, that said means defining the central inlet chamber closes the interspaces between adjacent combination discs and that the acceleration discs have through holes for axial transport within the inlet chamber of mixture having been brought in rotation by the acceleration discs.
By the invention there is no need for any separate means for fastening of the acceleration discs in the centrifuge rotor. Thereby, costs therefor have been eliminated and mounting of the acceleration discs has been made easier.
Within the scope of the invention said closing means may comprise separate gaskets arranged between the combination discs, but alternatively the combination discs themselves may be formed such that they will seal against each other around the central inlet chamber just by being axially kept together in their stack. The combination discs also may be permanently connected with each other by means of said closing means.
In a preferred embodiment of the invention the acceleration discs are substantially plane and the closing means is arranged between the radially outer portions thereof.
The invention is described below with reference to the accompanying drawing, in which
FIG. 1 shows an axial section through a centrifuge rotor designed according to the invention,
FIG. 2 shows a partly conical combination disc, seen from above, of the kind used in the centrifuge rotor in FIG. 1, a section line I--I in FIG. 2 illustrating which axial section is shown in FIG. 1.,
FIG. 3 shows another embodiment of a partly conical combination disc,
FIG. 4 shows an example of gasket means arranged in the way shown in FIG. 2 between adjacent combination discs.
FIG. 5 shows another example of how adjacent combination discs may seal against each other, sealing means being formed in the discs and extending in the way shown in FIG. 2, and FIG. 6 shows a special embodiment of a stack of combination discs which in their entirety are frusto-conical.
FIG. 1 shows schematically a centrifuge rotor, the rotor body of which comprises an upper part 1 and a lower part 2, which parts are axially kept together by means of a locking ring 3. The rotor body is supported by a vertical drive shaft 4.
Within the rotor there is for

REFERENCES:
patent: 882119 (1908-03-01), Ohlsson
patent: 993791 (1911-05-01), Ohlsson
patent: 2302381 (1942-11-01), Scott
patent: 3335946 (1967-08-01), Putterlik
patent: 3438571 (1969-04-01), Murkes
patent: 4701158 (1987-10-01), Inge et al.

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