Imperforate bowl: centrifugal separators – Process
Patent
1998-07-24
1999-08-31
Reifsnyder, David A.
Imperforate bowl: centrifugal separators
Process
494 27, 494 29, 494 30, 494 40, 494 41, 494 48, 210139, 210371, 210787, B04B 110, B04B 1104
Patent
active
059446498
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention concerns a method of supplying a control liquid to a rotor of a centrifugal separator by means of a supplying device, which has a cylinder, in which an axially displaceable wall element is arranged, which axially delimits a storing chamber arranged in the cylinder, in which a predetermined volume of control liquid is stored, and out of which at least a portion of this volume of control liquid is pressed during operation out of the storing chamber into the rotor upon axial displacement of the wall element.
The invention also concerns a device for supplying of control liquid to a rotor of a centrifugal separator. A device of this kind comprises a cylinder, in which an axially displaceable wall element is arranged, which axially delimits a storing chamber arranged in the cylinder, the storing chamber being arranged to store a predetermined volume of control liquid. To the storing chamber there is connected an inlet for the supply of control liquid to the storing chamber upon displaceable of the wall element in a first direction and an outlet passage arranged in the supplying device, through which at least a portion of the volume of control liquid stored in the storing chamber is pressed out of the storing chamber into the rotor via a conduit connected to the outlet passage when control liquid is supplied to the rotor upon axial movement of the wall element in a second direction. Supplying devices of this kind also comprise means to press the wall elements in the second direction with a predetermined force, which is higher than the resulting force of a liquid pressure prevailing in the storing chamber when control liquid is supplied to the rotor.
Furthermore, the present invention concerns a centrifugal separator, which is provided with a device to supply control liquid to its rotor.
BACKGROUND OF THE INVENTION
U.S. Pat. No. 4,510,052 shows a centrifugal separator, which is provided with a device of this kind to supply control liquid to its rotor in a manner described above to intermittently open and re-close a peripheral passage when needed or at equal time periods to empty the separator chamber of the rotor of all its contents of product or a wanted portion thereof. The passage is kept closed by pressing the valve slide in a direction closing the passage by a pressure force of a control liquid, which is present in a so called closing chamber, which is provided with an outlet valve at its outermost portion. This outlet valve is opened for discharge of more or less of the content of control liquid in the closing chamber by supplying a certain volume of control liquid by means of an injector driven by pressurized air at a high flow into a so called opening chamber, which is provided with a throttled outlet at its outermost portion. The control liquid present in the opening chamber influences the outlet valve with a pressure force in a direction opening the outlet valve against the action of a resulting force from a number of springs.
Gradually, the opening chamber is filled up with control liquid, which is entrained into the rotation of the rotor. The free liquid surface of the control liquid is then displaced radially inwardly and reaches rapidly a certain radial level, at which the pressure force from the control liquid accumulated in the opening chamber upon lasting conditions when the control liquid is fully entrained into the rotation of the rotor would exceed the resulting spring force and open the outlet valve whereby the control liquid would flow out of the closing chamber. However, the supply of control liquid is taking place at such a high flow that the opening chamber is filled up radially inwardly to a level far inside the first mentioned radial level with control liquid, which only partly has been entrained into the rotation of the rotor, before the outlet valve opens and lets control liquid out of the closing chamber.
When the outlet valve has opened this rapidly results in that so much control liquid has flowed out of the closing chamber that the p
REFERENCES:
patent: 4510052 (1985-04-01), Eklof
Alfa Laval AB
Reifsnyder David A.
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