Imperforate bowl: centrifugal separators – With means for furnishing auxiliary fluid to material or... – Gas other than air
Patent
1997-06-30
1999-03-23
Cooley, Charles E.
Imperforate bowl: centrifugal separators
With means for furnishing auxiliary fluid to material or...
Gas other than air
494 56, B04B 1106, B04B 1108
Patent
active
058852026
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention concerns a solid-bowl centrifuge with a drum for separating a mixture of solids and liquid. There is a weir disk between the interior of the drum and a space for conveying the separated liquid off. The weir disk rotates along with the drum, and the inner diameter of the level of the liquid in the interior of the drum depends on the diameter of the weir disk.
A centrifuge of this type is known from German 3 728 901 C1 for example. Since the device that extracts the separated solids is conventionally designed to prevent liquid from flowing off over it, the separated liquid can leave only by way of the inside diameter of the weir disk, which diameter accordingly dictates the level of the liquid in the interior of the drum. The weir in the known centrifuge comprises two disks of different diameter with a gap between them. The weir disks can be actuated as desired by a hydraulically powered slide, creating two different levels of liquid in the drum. The level of liquid cannot be varied continuously, and the design is relatively complicated.
SUMMARY OF THE INVENTION
The object of the present invention is a simpler centrifuge drum that will allow the level of liquid in the interior of the drum to be varied continuously.
This object is attained in accordance with the present invention in that barrier disks are associated with both flat surfaces of the weir disk and joined together gas-tight by a cylinder that extends through the inside diameter of the weir disk, whereby the first barrier disk is immersed in the liquid in the interior of the drum and the second in the liquid in the space for conveying liquid off, whereby chamber is left between the barrier disks that can be charged to different pressures with gas from a gas-supply channel. The level of liquid in the interior of the drum can accordingly be varied continuously.
As long as atmospheric pressure prevails in the pressure-charged chamber, the level of the liquid in the interior of the drum will correspond to the inside diameter of the weir disk. When the chamber is charged, the pressure will be transmitted to the liquid between the two weir disks. To compensate for the increase, the level of the liquid in the interior of the drum will shaft radially inward until there is an equilibrium in pressure between the corresponding liquids. The level of the liquid in the interior of the drum can accordingly be displaced radially inward to a level d that corresponds to the compensation pressure, whereby no more liquid can escape by way of the solids-extraction device.
The barrier disks in one advantageous embodiment of the present invention are stationary. The pressure-charged chamber can accordingly be connected to the also stationary gas-supply channel with no need for a rotating gasket.
The second barrier disk in another advantageous embodiment acts as a peeler. This feature simplifies the design of centrifuges that employ peelers.
Both of the flat surfaces of the weir disk in another advantageous embodiment have ribs. This feature minimizes the braking action of the barrier disks, an action that diminishes the centrifugal force.
Another advantageous embodiment of the present invention is characterized in that the barrier disks rotate with the drum, by a liquid-filled sealing chamber on the radially inward side of the cylinder, whereby a gas-conveying channel opens into the sealing chamber radially inward of the liquid level, and by a stationary gas-supply facility with two radially outward-facing sealing disks that immerse themselves in the liquid in the sealing chamber on each side of the gas-conveying channel. The friction losses in this embodiment are very low due to the immersion of the sealing disks in the liquid because the diameter of the sealing disks is essentially shorter than that of the barrier disks. Since the barrier disks also rotate, accordingly, they will entail no friction losses.
All the flat surfaces of the sealing chamber that face the sealing disks in another advantageous embodiment hav
REFERENCES:
patent: 3179334 (1965-04-01), Sharples
patent: 4417885 (1983-11-01), Kohlstette et al.
patent: 4615690 (1986-10-01), Ecker
patent: 5167609 (1992-12-01), Graw et al.
patent: 5244451 (1993-09-01), Retter
Cooley Charles E.
Westfalia Separator Aktiengesellschaft
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