DE973424C - Centrifuge drum - Google Patents

Description

ISSUED MARCH 17, 1960

K 197 53 III j 82b

Centrifuge drum

The invention relates to a centrifuge drum for the continuous ejection of solid material Components made from liquid centrifugal material with one formed from longitudinal lamellae or rods and passage widths between these drum mantles.

This well-known centrifuge drum is conical formed, the drum shell consisting of rods or wires produced in this way is that the initially arranged in the direction of the surface lines and in the desired cone shape Rods or wires are welded together at one end and then by means of a special Manufacturing device are twisted so that they run spirally with a steady slope.

This creates a conical centrifuge drum that is rigid in the finished state or in the operating state. With such a centrifuge drum although the wear of the screen jacket as a result of the direction of the rods or wires of the screen jacket occurring discharge of the centrifuged material is reduced. However, it guarantees the same Like the other conical centrifuge drums, only for a very specific material to be thrown Consistency, optimal degree of drainage and short spin times. Each of these special Centrifugal material deviating from suitable properties is either insufficiently drained or calls an undesirable increase in the spin time.

909 731/6

Thin liquids leave the centrif ugentrommal too fast to be sufficiently drained, while viscous centrifugal material is unnecessary linger in it for a long time. In particular, in such conical centrifuge drums, the Viscosity and thereby also the friction of the material to be centrifuged on the drum shell during its flow through the drum constantly increases as a result of the gradual withdrawal of liquid, ίο which makes it difficult for the material to flow through the drum. To remedy this Deficiency has already been proposed, the angle of inclination of the drum shell to the drum axis corresponding to the increase in viscosity or friction from the entry to the discharge end of the centrifuge drum gradually enlarge and give the centrifuge bowl a bell shape for this purpose admit. This shape ensures a jam-free and thus more favorable flow of the Achieved centrifugal material because the centrifugal material on its way through the bell-shaped centrifugal drum in the area of the discharge end slides over a more inclined shell part and therefore despite increasing viscosity is discharged without congestion. The drum shell of this known centrifuge drum however, it is provided with circular openings. This will make the most effective Screen area reduced by the steadily increasing inclination of the drum shell, because for the passage the liquid through the perforation only its smaller with increasing inclination, Projection surfaces perpendicular to the radial direction of passage are available. aside from that the bell-shaped centrifuge drum is only ever suitable for a particular type of material to be centrifuged Property, because this shape makes it in the same way as the conical ones Centrifuge drums a favorable flow of the centrifugal material is only achieved when the The inclination of the drum shell corresponds to the nature of the material to be thrown. In contrast, the object of the invention is to create a centrifuge drum, the optimal degree of dewatering regardless of the consistency of the material to be centrifuged when the material flow is free of congestion and short spin times guaranteed.

This object is achieved according to the invention that the drum casing is bell-shaped in known manner and lying in paralle ¹ en planes, the ends of the slats or bars receiving end faces of the drum are rotated in opposite directions to adapt to the particular nature of the material to be centrifuged .

These measures result in a significant progressive effect, as by the preferably over the entire length of the drum extending through openings also in the strong inclined part of the drum that is suitable for the radial passage of the liquid Cross-section of the passage openings not reduced so that this results in a constant drainage over the entire drainage path of the material to be centrifuged. By twisting the slats or rods Front sides of the drum is not only a large adjustment of the inclination of the Drum shell to the particular nature of the material to be centrifuged achieved, but it will be about it In addition, the lamellae or rods in the helical shape, which reduces wear and tear Brought through flow direction of the centrifugal material. This not only results in a high throughput rate the centrifuge and high efficiency, but also ensures a long service life of the centrifuge drum.

In the drawing there are exemplary embodiments Drum according to the invention shown schematically. It shows

Fig. Ι a centrifuge drum ', whose, the The lamellae or rods forming the drum shell intersect the drum axis in their planes,

Fig. 2 a further design of the centrifuge drum with the drum axis in its planes intersecting slats or bars,

Fig. 3 a lamella, the inner surface of which: the centrifuge drum 'forming surface lined up flat surfaces.

In a plumb line or horizontally in a centrifuge arranged, bell-shaped to the discharge ι widening centrifuge drum 2 is the material to be thrown through an inlet pipe (not shown in the drawing) above the disc 3 trained drum base registered. The material to be spun slides under during the rotation of the drum the effect of centrifugal force over the drum shell 4 inclined to the drum axis to the discharge end ι the centrifuge drum 2, from which the material dewatered on its glide path is thrown off and is collected separately from the ejected liquid. Due to the bell shape of the Centrifuge drum 2 a saftauffree flow of the centrifuged material is achieved through the drum, because the braking effect of the viscosity increase on the drainage path, gradually increasing friction of the material to be centrifuged on the drum jacket by the towards the discharge end of the centrifugal drum 2, the increasing inclination of the drum shell 4 is compensated will. The drum shell 4 consists of lamellas! or rods 5, which in the longitudinal direction of the Drum 2 arranged next to one another at a distance adapted to the grain size of the material to be centrifuged are. Through the passage openings 6 extending over the entire length of the drum compared to a circular design, for example, the same avoided that the dlurch to Discharge 1 of the centrifuge drum 2 increasing inclination of the drum shell 4 for iao the passage of the material to be thrown into question, perpendicular to the direction of passage Projection of the opening areas is reduced. The ends of the slats or bars x 5 are on Rings or on a ring provided at the discharge end of the centrifuge drum 2 and on the opposite

overlying drum edge attached to the disc 3 serving as the drum base. Through an in . The device not shown in the drawing can be arranged on the drum shell ends Rings or the ring 7 and the disk 3 twist against each other and thereby the inclination of the Change the inner surface of the centrifuge drum 2. This results in an adaptation of the surface inclination given to the particular nature of the inlet material with regard to its viscosity. Since this the rotation of the rings or the ring 7 and the disc 3 takes place so that the Lamellae or rods 5 in the helical flow direction of the material to be centrifuged through Reach centrifugal drum 2, a reduction in abrasion or the is in an advantageous manner Wear of the lamellas or bar edges achieved by the centrifuged material. Dia slats or bars 5 preferably have a rectangular cross-section, being so arranged in the centrifuge drum 2 are that the longitudinal axis of this cross-section is radial to the center of the drum cross-section is directed. The cross-section of the lamellae or bars S does not, however, need over the whole Drum length to be the same, it can also be the inner drum shell 4 forming surface, such as Fig. Ι and 2 show curved or, as Fig. 3 shows, polygonal or all over Length to be flat. Furthermore, the lamellas or rods 5 can in their non-rotatable position in the axial direction the centrifugal drum 2 (Fig. 1) or at an angle to it (Fig. 2) be. The fastening of the lamellae or rods 5 to the rings or to the ring 7 and the disk 3

does not need to be rigid, as shown, for example, in Figs. 1 and 2 , whereby they bend elastically in the desired direction when their holding elements (rings or ring 7 and disk 3) are rotated, but it can also move in any direction

other kind, e.g. B. articulated. In addition to the retaining organs, the drum shell can be used to stiffen the drum shell also one or more more distributed over the length of the drum, the slats or Rings 5 connecting rods and arranged parallel to the end faces are provided.

Claims (4)

PATENT CLAIMS: 1. Centrifuge drum for the continuous ejection of solid components from liquid Centrifugal material with one formed from the slats or rods running longitudinally and through step gap between these having drum shell, characterized in that the Drum shell (4) is bell-shaped in a known manner and in parallel Laying planes, the ends of the lamellae or rods (5) receiving end faces the drum (2) to adapt to the respective nature of the material to be centrifuged against each other are rotatable. 2. centrifuge drum according to claim 1, characterized in that in the largest Cross-sectional area of the drum (2) lying face of an annular disk (7) and the in the smallest cross-sectional area of the face of a full or ring-shaped disc (3) are formed, on whose facing end faces the lamellae or rods (5) are fixed or articulated. 3. centrifuge drum according to claims 1 and 2, characterized in that the lamellae or rods (5) preferably have a rectangular cross section, the longitudinal axis of which is arranged radially to the drum axis. 4. centrifuge drum according to claims: 1 to 3, characterized in that the generatrix of the lamellae or rod surfaces formed Troinmelmantels is a steadily curved or a polygonal curve. 1 sheet of drawings