Imperforate bowl: centrifugal separators – With means for furnishing auxiliary fluid to material or... – Liquid
Patent
1998-07-17
2000-01-18
Cooley, Charles E.
Imperforate bowl: centrifugal separators
With means for furnishing auxiliary fluid to material or...
Liquid
494 38, 494 56, B04B 1100
Patent
active
06015375&
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a centrifuge with vertical pivot axis, including a centrifugal drum formed with a peeling chamber which is connected via at least one drain channel to the partition space of the centrifugal drum and having a peeling device disposed in the peeling chamber for effecting a continuous drain of a liquid phase clarified or separated in the centrifugal drum, as well as a locking disk located above the peeling chamber and securely fixed to the peeling device, with the locking disk projecting in a locking chamber circulating conjointly with the centrifugal drum, wherein the peeling device is provided with a channel for supply of a sealing liquid into the locking chamber, and the locking chamber is bounded upwardly and outwardly by a lid having a free edge facing the pivot axis and forming an overflow weir.
Water or another foreign liquid may be used as sealing liquid that is introduced from outside into the locking chamber.
The peeling chamber situated above the peeling chamber and called also hydrohermetic chamber prevents penetration of atmospheric air into the peeling chamber and thus into the liquid phase peeled off from this chamber.
There is known a centrifuge of the above-stated type (DE 40 14 552 C1), in which deposits of solids may form at the periphery of the locking chamber during operation and cannot be flushed out even during CIP method. These deposits, in so far as being of organic nature, may start to decay, so that the product passing through the centrifuge can be contaminated.
SUMMARY OF THE INVENTION
The invention is based on the object to so design a centrifuge of the afore-stated type that deposits of solids at the periphery (at the outer bottom) of the locking chamber are discharged with the overflow stream of the sealing liquid or/and with the drain flow of the cleaning medium during a CIP method in the space between centrifugal drum and centrifuge housing.
This object is attained in accordance with the invention by arranging between the locking disk and the first lid a second locking chamber lid which is inwardly offset with respect to the outer bottom of the locking chamber and forms with the first lid a flow channel for carrying away solids deposited on the outer bottom of the locking chamber via the overflow weir.
The flow channel, which is bounded by both lids of the locking chamber, encounters during operation of the centrifuge upon addition of sealing water a directed flow which carries away solids deposited on the outer bottom, on the periphery of the locking chamber via the overflow weir.
The CIP method (cleaning in place) includes a liquid cleaning medium which is guided through the centrifuge at full rotating speed. Through throttling of the drain pressure of the peeling device, the liquid level in the peeling chamber can be shifted thereby radially inwards to such an extent that liquid flows from the peeling chamber via the inner boundary of the overflow into the locking chamber, thereby resulting in an intense thorough flushing of the locking chamber by a stream through the flow channel defined by both lids. All solids deposited on the periphery of the locking chamber are thereby flushed out, leading to a hygienically clean hydrohermetic chamber.
Further features of the invention are subject matter of the sub-claims.
BRIEF DESCRIPTION OF THE DRAWING
An exemplified embodiment of the centrifuge according to the invention is illustrated in the drawing and described hereinafter. The drawing shows a partial vertical section of the centrifuge.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
The centrifuge 1 has a centrifugal drum 2 supported for rotation about a vertical axis 3 and includes an inlet pipe 4 through which the product to be separated by the centrifuge into several phases is fed into the centrifugal drum 2.
A liquid phase of the product is directed into a peeling chamber 5 and guided from there under pressure via a peeling device 6 for discharge from the centrifuge.
Located above the peeling chamber 5 is a locking
REFERENCES:
patent: 3317126 (1967-05-01), Little et al.
patent: 4695270 (1987-09-01), Zettier
patent: 4718886 (1988-01-01), Mackel
patent: 5167609 (1992-12-01), Graw et al.
Cooley Charles E.
Feiereisen Henry M.
Westfalia Separator AG
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