Centrifugal separator

Details Centrifugal separator Centrifugal separator

1996-12-04

1998-07-14

Cooley, Charles E.

Imperforate bowl: centrifugal separators

Rotatable bowl

Including discharge-related structure in nature of static...

494 70, B04B 1102

Patent

active

057796190

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The present invention concerns a centrifugal separator comprising a rotor, which is rotatable in a predetermined rotational direction around a rotational axis, and which forms an inlet for the liquid, which is to be centrifugally treated, and an outlet chamber for liquid separated in the rotor. The outlet chamber, which surrounds the rotational axis, is so designed that liquid present in the outlet chamber during operation forms a liquid body rotating around the rotational axis, the liquid body having a radially inwardly directed free liquid surface at a wanted radial level in the rotor. The centrifugal rotor also comprises a stationary discharge device, which is arranged in the outlet chamber and extends from the rotating liquid body radially inwardly to a central outlet. Inside itself the discharge device forms a flow channel with an inlet opening, which radially is located in the area where the free liquid surface is located during operation. During operation the inlet opening is located at least partly in the liquid body and via the flow channel the inlet opening is connected to the central outlet. The discharge device has a front contour projected in a plane perpendicular to the rotational axis and directed towards the rotational direction and a rear contour projected in this plane and directed in the rotational direction.


BACKGROUND OF THE INVENTION

Seen radially outwardly the contour of the discharge device in known separators of this kind is often directed towards the rotational direction, the inlet opening being directed towards the rotational direction. This allows one to obtain a high pressure in the liquid discharged through the outlet. However, surfaces of the discharge device, which during operation is located in the rotating liquid body and is directed towards the rotational direction, cause a considerable splashing of the separating liquid in the outlet chamber, which results in a great energy consumption and a great danger that the air or gas, which during operation is located radially inside the free liquid surface, can be entrained by the liquid, which leaves the outlet chamber through the flow channels in the discharge device.
Some liquid drops splashing around the discharge device are entrained in the rotation of the co-rotating air or gas volume radially inside the free liquid surface and are deposited onto the outside of the stationary discharge device. Along the outside of the discharge device liquid flows radially inwardly towards central parts of the discharge chamber where liquid might flow through central openings into another outlet chamber for another component separated out of the supplied liquid, which other component must not be contaminated by the separated liquid.
In a centrifugal separator known from EP A1 0 058 353 the discharge device is designed as a wing, which with internal flow channels extends radially outwardly into the rotating liquid body in such a way that a flow of liquid may take place along the discharge device with a relatively small flow resistance. By designing the discharge device in this manner the splashing of the separated liquid around the discharge device decreases and, thereby, the danger that air or gas is entrained in the flow of the separated liquid out of the separator decreases. However, the surfaces of the discharge device directed towards the rotational direction result in that quite a lot of splashing takes place during operation around the discharge device in spite of this design of the discharge device and that the danger of having air or gas admixed into the separated liquid also out of this centrifugal separator is relatively great.


SUMMARY OF THE INVENTION

One object of the present invention is to provide a centrifugal separator of the kind initially described, in which the above described splashing around the discharge device is slight and the danger of having air or gas entrained by the flow of the separated liquid out of the centrifugal separator is low, and in which the separated liquid can be dischar

REFERENCES:
patent: 4516987 (1985-05-01), Niggemann
patent: 4566873 (1986-01-01), Toda
patent: 5147280 (1992-09-01), Carlsson et al.
patent: 5160311 (1992-11-01), Inge et al.
patent: 5171205 (1992-12-01), Monkenbusch

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