Centrifugal separator

Details Centrifugal separator Centrifugal separator

1994-03-04

1994-11-08

Scherbel, David A.

Imperforate bowl: centrifugal separators

Rotatable bowl

Including structure located within vertically-oriented bowl...

494 79, 494 80, B04B 108

Patent

active

053622928

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The present invention concerns a centrifugal separator comprising a rotor, which is supported by a driving shaft and forms a separation chamber and a centrally located inlet chamber, the latter communicating with the separation chamber through channels distributed around the rotational axis and being delimited by a dividing wall at one of its axial ends. The centrifugal separator also comprises an inlet tube having an inlet channel extending axially through the dividing wall and opening in the inlet chamber at said one of its axial ends, a stack of annular acceleration discs coaxial with the rotor, the discs being rotatable with the rotor and arranged at an axial distance from each other in the inlet chamber between the opening of the inlet channel and the second axial end of the inlet chamber to bring a supplied liquid during operation to rotate with the rotor and form a rotating liquid body in the inlet chamber. In the centrifugal separator there is arranged an evacuating channel, which connects a central part of the inlet chamber to a space outside the same.


BACKGROUND OF THE INVENTION

A problem in connection with centrifugal separators of this kind is to bring the liquid supplied through the inlet tube to rotate with the rotor without a dispersed phase of the liquid being splitted by the shearing forces acting on the same, which makes the following separation of this phase out of the liquid more difficult. An efficient and gentle acceleration of the liquid is thus desired for obtainment of a maximum separation result in the centrifugal separator. A kind of acceleration and entrainment member often used is wings, which extend axially and radially and are supported by the rotor in the inlet chamber. However, these wings give rise to heavy strains on the supplied liquid in the form of shocks and shearing forces. If the inlet chamber is not filled during the operation all the way to the centre, these wings cause, in addition, splashing of the incoming liquid, which means that air is mixed with the liquid.
A proposed solution of the described problem is shown in the U.S. Pat. No. 2,302,381. The centrifugal separator shown therein has a rotor, which inside itself forms a separation chamber and an inlet chamber, the latter communicating with the separation chamber. The liquid mixture of components, which are to be separated, is supplied to the inlet chamber centrally through an inlet channel in the vertical driving shaft of the rotor. Inside the inlet chamber there is arranged a stack of annular discs, which are rotatable with the rotor. The centre of the discs coincides with the rotational axis of the rotor. Centrally every disc has a circular opening, which openings together form a reception chamber for the supplied liquid mixture. Between themselves the discs form passages through which the liquid mixture is intended to flow radially outwards towards the separation chamber.
In the centrifugal separator known from U.S. Pat. No. 2,302,381 the inlet channel ends below the said reception chamber. The inlet channel has an opening directed axially towards the reception chamber, the flow through the opening being strongly restricted. Upon supply of liquid mixture through the inlet channel, hereby, a jet is created, which passes through the reception chamber and hits a deflection member. This deflection member rotates with the rotor and deflects the liquid mixture in the jet radially outwards towards the annular discs, between which the liquid mixture flows further on towards the separation chamber.
In the passages between the discs the supplied liquid is brought to rotate with the rotor without being exposed to as heavy strains as entraining members in the form of wings give rise to in the same circumstances. On the contrary, both the strong restriction of the flow at the opening of the inlet channel and the collision between the created jet and the conical deflection member result in a strong turbulence and splitting of the components of the liquid mixture, which in many cases makes it

REFERENCES:
patent: 2302381 (1942-11-01), Scott
patent: 2808200 (1957-10-01), Wishaw
patent: 2946777 (1960-07-01), Mertes
patent: 3245542 (1966-04-01), Stevens
patent: 3356223 (1967-12-01), Mercier
patent: 3482771 (1969-12-01), Thylefors
patent: 4295600 (1981-10-01), Saget
patent: 4701158 (1987-10-01), Inge et al.
patent: 4721505 (1988-01-01), Inge et al.

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