EP1786565B2 - Self-dumping separator with a disc stack - Google Patents

Abstract

The invention relates to a vertical axis self-dumping separator provided with a drum (1) in which a disk stack (3) consisting of several discs (4) is arranged, wherein a product to be centrifuged is introducible through a supply pipe (6) and a distributor (7) in a centrifugal chamber (2) which is surrounded by the drum (1), at least two or several ribs (17) are provided in a solid matter chamber (15) disposed outside of the disc stack and a gap between the ribs (17) and the internal wall of the drum (1) is equal to or greater three millimetres.

Description

The invention relates to a self-draining separator with disc package according to the preamble of claim 1.

Self-emptying separators with disc packs, for example, have a piston valve or the like for emptying, are known per se in various embodiments. They are used in different types of centrifuges, e.g. Used in clarifying, separating or sterilizing centrifuges for a variety of purposes. The preferred area of application is the processing of dairy products and in particular the sterilization and skimming of milk.

It is also known to provide self-emptying centrifuge drums with ribs outside the plate pack. Such an arrangement shows, for example, the US 2,126,864 , which shows a separator with a drum with Feststoffaustragsöffnungen, which are closed by a piston valve.

In today's usual self-cleaning separators u.U. Cleaning problems. It turns out that the cleaning effect on the drum cover and on the bottom of the centrifugal space in the drum is particularly problematic and that there is often still contamination to be found after an automatic cleaning.

Against this background, the invention has the object to improve the structural design of the separator in the generic way such that an improved cleaning effect can be achieved.

The invention solves this problem by the subject matter of claim 1.

According to the invention, the drum has Feststoffaustragsöffnungen and the distance between each of the ribs - or the advantageous realized rib insert - and the inner wall of the drum is at least three millimeters at each point.

Thus, such a large distance between the ribs and the inner shell of the drum is realized that exist in the solids space at any point sufficiently large distances between the ribs and the drum inner shell, in particular the drum lid and the bottom of the centrifugal space and preferably to other critical in terms of cleaning bodies whereby a sufficiently large relative movement of the liquid relative to the drum in the circumferential direction is always allowed on the outer peripheral surface and in other edge regions of the centrifugal space.

From the US 3,529,767 is a construction with ribs in a Separatortrommel known, but always one of the ribs (eg, the ribs 51 ") bear directly on the drum shell.

The state of the art still the DE 567 665 , the DE 444,573 , the US 2,662,687 and the US 2,313,541 called. These documents each show Kammerseparatoren with rib inserts outside of the disk pacts, but no Feststoffaustragsöffnungen, so that the advantages of the invention can not arise. The US 2,477,982 shows a self-draining separator with outlet openings without spool, with ribs outside the plate package in turn extend to the drum lid. The US 5,735,789 shows a separator with a disc package with rib-shaped spacers.

Advantageous developments and refinements of the invention can be found in the dependent claims.

Preferably, an annular gap of at least 0.5 mm, but a maximum of 5 mm is formed between the ribs and the plate package in order to sufficiently clean this area as well.

According to a further embodiment of the invention, it is advantageous if the ribs cover at least 5 percent but not more than 95 percent of the cross-sectional area of the solids space in order to always ensure a sufficiently large cleaning effect.

In a design as Trennseparator it is also advantageous according to the finding of the invention that the outer diameter of the ribs at least 2 mm, but at most 25 mm larger than the diameter of the separator plate.

In this case, the center of gravity of the rib surface should preferably be above the emptying plane. Alternatively, it is also conceivable to arrange this center of gravity below the emptying level, but this leads to less advantageous results.

According to a further advantageous embodiment of the invention, the rib surfaces are provided with compensation openings. These relieve the ribs in drum discharges advantageously of peaks of the Coriolis pressure.

It is also advantageous to position the ribs so that their surfaces are each aligned at an angle of up to 45 ° leading or trailing to the radius of the drum.

After development of the invention, it is also conceivable to use three-dimensionally curved blades instead of flat ribs. Finally, it has been shown that at least two, but preferably 8 to 24 ribs, in particular should be distributed uniformly on the outer circumference of the plate package.

Advantageously, the ribs are combined by connecting elements to form an annular insert, which facilitates the assembly and disassembly of the ribs as a unit. This rib insert is also preferably fixed in position by support elements which are integrated in the plate package.

In addition, the rib insert for fixing is preferably firmly connected to the separator plate - if present.

Figur 1 bis 6

schematisierte Schnittansichten eines Teilbereichs einer erfindungsgemäßen Separatortrommel;

Figur 7

eine schematisierte Darstellung der Ausgestaltung von Rippen nach einem besonderen Ausführungsbeispiel der Erfindung;

Figur 8

eine schematisierte Darstellung eines Rippeneinsatzes in einer Draufsicht.

The invention will be described in more detail below with reference to the figures with reference to preferred embodiments. It shows:

Figure 1 to 6

schematic sectional views of a portion of a separator drum according to the invention;

FIG. 7

a schematic representation of the configuration of ribs according to a particular embodiment of the invention;

FIG. 8

a schematic representation of a ribbed insert in a plan view.

FIG. 1 shows a highly schematically illustrated drum 1 for an otherwise not with regard to its other components such as the drive and the like. shown separator with a vertical axis of rotation D, wherein the drum defines a centrifugal space 2, in which a plate package 3 is inserted from a plurality of conical plate 4, in which one or more riser channels 5 are formed.

It should be noted that the terms such as "top", "bottom", "front" or "rear" and the like. refer only to the illustrated schematic embodiments and are not intended to be limiting. Thus, the inlet pipe in alternatives, not shown embodiment, also be carried out from below the drum, although in FIG. 1 a variant is shown, in which the inlet pipe is guided from above into the drum.

The centric inlet pipe 6 opens from here initially from above into a distributor 7, which has channels 8, which conduct the centrifuged material outwards as far as the outlet openings 9 into the centrifugal space 2.

The outlet openings 9 can be arranged at different radii, preferably on such radii, which lie just before or within or after or outside the outer periphery of the plate 4.

The drum has Feststoffaustragsöffnungen 10, which are preferably at the largest diameter of the drum and which preferably a piston valve (not shown) is connected upstream. To realize the self-draining function or to open and close the solids discharge openings 10, e.g. serve a piston valve, not shown here.

At least one discharge channel 11, which may be followed by a paring disc, allows the discharge of a liquid phase from the centrifugal space 2.

According to the embodiment of FIG. 2 , which is shown simplified, so that the inlet pipe and the channels and outlet openings of the distributor are not shown, it is still possible to derive a second liquid phase via a separator plate 23 (outer diameter Ds) from the drum.

The drum 1 has a drum base 12 and a drum shell 13, or the like via a locking ring 14. are firmly connected.

Outside of the plate package is in the radially outwardly tapering ring or solid space 15, a ribbed insert 16 (see FIG. 8 ) arranged with a plurality of ribs 17, wherein the ribs 17 are combined by connecting elements 18, 19 to the insert 16.

The insert can be fixed in position by support elements which are integrated in the plate package (not shown here). Also, the insert is spaced at any position at least 3 mm from the drum inner wall

Alternatively, it is also conceivable, the rib insert 16 for fixing fixed to the cutting plate 23 of the FIG. 2 connect to.

It is important that the rib insert 16 is firmly fixed in the solid space 15 in its position.

The ribs can - as in FIG. 8 recognizable - be directed radially outward or with respect to the direction of rotation (R) - see FIG. 7 - In particular up to 45 ° inclined to the radial r (angle α) be aligned leading or lagging.

It is important that at the outer edges of the ribs 17 and the drum base 12 and the drum top 13 each have a gap S1, S2 remains, which is at least 3 mm wide or more at each rib around. Furthermore, there is preferably a further annular gap S3 of at least 0.5 mm and a maximum width of 5 mm between the ribs and the plate package.

Such a particularly advantageous cleaning effect is achieved because it is ensured that always a sufficiently large cleaning effect in the solid space 15 is achieved because at all points between the ribs 17 and the drum 1 is always a sufficiently large flow at critical points and in particular at outer peripheral surfaces in all edge regions of the centrifugal space a sufficiently large relative movement of the liquid is allowed relative to the drum in the circumferential direction.

FIG. 1 shows a variant in which the ribs 17 cover a large part of the cross section of the solid space, in particular up to 95 percent of the cross section of the solid space 15.

The cross section of the ribs 17 in FIG. 2 is somewhat smaller, whereas in FIG. 2 also the additional disc plate 23 is provided. The outer diameter D _{A of} the ribs is at least 2 mm and a maximum of 25 mm larger than the diameter D _{S of} the disc plate 23rd

FIG. 3 illustrates that the center of gravity P1 of the rib faces lies above its plane of action, which is determined by the solids discharge opening 10.

FIG. 4 1 illustrates a corresponding variant in which this center of gravity P2 of the ribs is arranged below the plane of the solids discharge opening 10.

FIG. 5 illustrates further connecting elements (eg rings) 20, 21 for connecting the ribs 17 with each other.

FIG. 6 shows that the ribs may be provided with openings 22 to relieve the rib surfaces of the ribs 17 at the solids discharge of tips of the Coriolis pressure.

reference numeral

drum

1

centrifugal chamber

2

Disc stack

3

Plate

4

supply pipe

6

distributor

7

channel

8th

outlet opening

9

Solids outlet opening

10

Waterway

11

Drum base

12

Drum shell

13

locking ring

14

Solid space

15

ring insert

16

ribs

17

connecting element

18

connecting element

19

connecting element

20

connecting element

21

opening

22

separating disk

23

annular gaps

S1, S2, S3

Outer diameter ribs

D _A

axis of rotation

D

Outer diameter of divider plate

D _S

direction of rotation

R

radial

r

focus

P1, P2

angle

α

Claims (14)

1. Self-dumping separator having a vertical rotation axis and comprising a drum (1) with solids-discharge openings (10) into which a disc stack (3) made up of a plurality of conical discs (4) is inserted, wherein a material to be centrifuged can be introduced via a feed pipe (6) and a distributor (7) into a centrifugal chamber (2) surrounded by the drum (1), and wherein, in an annular solids chamber (15), disposed radially outside of the disc stack (3), at least two or more ribs (17) are disposed, wherein a separating disc (23) is disposed in the drum above the disc stack (3), characterized in that the diameter (D_A) of the ribs (17) is at least 2 mm, but maximally 25 mm larger than the diameter (Ds) of the separating disc (23) above the disc stack (3) and that the distance between each of the ribs (17) and the inner wall of the drum (1) measures at least three millimetres.
2. Separator according to Claim 1, characterized in that between the ribs (17) and the disc stack (3) there exists an annular gap (S3), which is at least 0.5 mm, and maximally 5 mm wide at all points.
3. Separator according to one of the preceding claims, characterized in that the ribs (17) cover at least 5 percent and maximally 95 percent of the cross-sectional area of the solids chamber (15).
4. Separator according to one of the preceding claims, characterized in that the centre of gravity (P1) of the rib faces of the ribs (17) is situated above the dumping plane, which is predefined by solids-discharge openings (10).
5. Separator according to one of the preceding claims, characterized in that the centre of gravity (P2) of the rib faces of the ribs (17) is situated beneath the dumping plane, which is predefined by the solids-discharge opening (10) of the drum.
6. Separator according to one of the preceding claims, characterized in that the ribs (17) have at least one or more openings (22) in their rib face.
7. Separator according to one of the preceding claims, characterized in that the ribs (17) are radially aligned.
8. Separator according to one of the preceding claims, characterized in that the ribs (17) are aligned such that they are leading or lagging by up to 45° relative to the radius of the drum.
9. Separator according to one of the preceding claims, characterized in that the ribs (17) are of flat configuration.
10. Separator according to one of the preceding claims, characterized in that the ribs (17) are configured as multidimensionally curved blades.
11. Separator according to one of the preceding claims, characterized in that 8 to 24 of the ribs (17) are inserted in the drum (1).
12. Separator according to one of the preceding claims, characterized in that the ribs (17) are amalgamated by connecting elements (18, 19, 20, 21) into an annular, pre-assembled insert (16).
13. Separator according to one of the preceding claims, characterized in that the insert (16) is fixed in its position by supporting elements integrated in the disc stack (3).
14. Separator according to one of the preceding claims, characterized in that the insert (16), for fixing purposes, is fixedly connected to the separating disc (23).

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