Centrifugal drum with increased flow resistance

Details Centrifugal drum with increased flow resistance Centrifugal drum with increased flow resistance

1998-09-11

2000-03-07

Cooley, Charles E.

Imperforate bowl: centrifugal separators

Rotatable bowl

Including structure located within vertically-oriented bowl...

B04B 108

Patent

active

060333561

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to a centrifugal drum with a disk insert and a stationary inlet pipe which extends into an inlet space which rotates with the drum. The inlet space includes an antechamber with ribs and a rib-free inlet chamber. The antechamber and the inlet chamber are connected with each other through an annular gap which is formed between the outside diameter of a disk and a wall of the inlet space. The inlet space is connected by ducts to an outlet chamber for the fluid to be discharged. The inlet chamber can be filled completely due to the throttle effect of the ducts.
A centrifugal drum of this type is known from DE 36 27 826 C2. The throttle effect is produced by a feature where the diameter at which the ducts in the inlet chamber begin, is larger than the diameter of the fluid level in the outlet chamber. This solution requires a relatively high circumferential velocity at the inlet of the ducts which can harm sensitive centrifuged materials, although the fluid is accelerated while the inlet space is completely filled.


SUMMARY OF THE INVENTION

It is an object of the invention to improve the known centrifugal drum and to reduce the mechanical stress on the centrifuged material in the inlet space.
The object is solved by forming ducts which extend radially inwardly close to the inlet pipe, wherein the ribs are shielded from the inlet chamber by a separation wall and wherein the throttle effect is produced by at least one rib-free annular space through which the fluid to be discharged flows in a radial direction.
The rib-free annular space is arranged outside the inlet space. The inlet of the ducts can then be arranged on a relatively small diameter, thereby significantly reducing the mechanical stress on the centrifuged material.
In an advantageous embodiment, the rib-free annular space is arranged on the radially outermost boundary of the ducts which originate from the inlet space. This design is easy to implement.
In another advantageous embodiment, the rib-free annular space is arranged on the periphery of the outlet chamber. At this point, sensitive particles have already been separated out and can therefore no longer adversely affect the process.
The rib-free annular space can also be disposed in the gaps of the disk insert. This feature can be implemented by simply detaching at an appropriate location the spacer bars typically found on the disks.
In another advantageous embodiment, the bottom side of the disk is provided with guide ducts. This feature counteracts a rotation of the fluid in the inlet chamber and provides a large pressure drop between the antechamber and the inlet chamber, thereby generating a relatively high static inlet pressure in the inlet space.
The guide ducts are aligned radially in their center section to prevent the creation of a harmful rotation of the fluid.
The guide ducts may be advantageously aligned in their center section tangentially, opposing the direction of rotation of the centrifugal drum. The resulting fluid rotation counteracts entrainment by elements of the rotating drum.
In still another advantageous embodiment, the guide ducts are closed off by a cover plate. The inside diameter of the cover plate in conjunction with the outside diameter of the inlet pipe forms an annular gap which is connected to the inlet chamber. With this feature, large quantities of fluid can be circulated while at the same time rotation of the liquid in the inlet chamber is almost entirely suppressed.


BRIEF DESCRIPTION OF THE DRAWING

An embodiment of the invention is illustrated in the drawing and is described in greater detail in the following. It is shown in
FIG. 1 a cross section through the centrifugal drum,
FIG. 2 the section II--II of FIG. 1.


DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

Reference numeral 1 in FIG. 1 refers to the centrifugal drum which includes a separation unit 2 which is located near the inlet and remains stationary during operation. The centrifugal drum 1 has a solid matter space 3 and a separation space which is

REFERENCES:
patent: 2294468 (1942-09-01), Lindgren
patent: 3468475 (1969-09-01), Thylefors
patent: 3741467 (1973-06-01), Kjellgren
patent: 4695270 (1987-09-01), Zettier
patent: 4729759 (1988-03-01), Krook et al.
patent: 5147280 (1992-09-01), Carlsson et al.
patent: 5160311 (1992-11-01), Inge et al.
patent: 5779619 (1998-07-01), Borgstrom et al.

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