EP1038584A1 - Centrifuge with skimmer lock - Google Patents

Abstract

The rotary disc shaft (10) and the rotary disc-outer part (12) and/or at least one further element (24,32) are connected to each other between rotary disc (8) and a diverting chamber (34) on the rotary disc shaft, so that the further element (24,32) are stopped from rotating on the rotary disc shaft (10). Centrifuge has (a) a drum (2) (b) at least one rotary disc (8) for diverting of liquid from the drum (2) (c) rotary disc (8) having a rotary disc shaft (10) and a rotary disc outer part (12), between which or in which at least a diverting channel (18) is formed.

Description

The invention relates to a centrifuge which has the following: a centrifugal drum and at least one peeling disc for draining liquid from the Centrifugal drum, the peeling disc having a peeling disc shaft and a Includes peeling disc outer part, between which or in which at least one Discharge channel is formed.

A generic centrifuge is known from US 2,171,136. At the in this Scripture shown centrifuge are a peeling disc lower part and the peeling disc shaft formed in one piece, the channels on the peeling disc shaft as well the entire combination element from the peeling disc shaft and the peeling disc lower part complex - for example by means of lengthy form milling processes Need to become. The peeling disc top part is used in the in this document State of the art shown on the peeling disc lower part on the peeling disc shaft screwed on and is because of peeling disc lower part and peeling disc shaft are formed in one piece, in this way against rotation on the peeling disc shaft fixed.

For a one-story design of the peeling disc shaft with the peeling disc lower part To avoid, it is possible to separate the lower part of the peeling disc or to form a ring element combined with the peeling disc outer part, which is pushed over the peeling disc shaft. To at high performance to prevent the peeling disc from twisting on the peeling disc shaft, the peeling disc outer parts in this case by means of special locking devices attached to the peeling shaft. Locking devices are conceivable in Form of feather keys on the shaft. With this solution, too, the discharge channels usually formed on the shaft by complex form milling operations. The separately designed locking devices can lead to large overflow diameters lead the peeling disc chamber, whereby the available discharge pressure of the Peeling organ is limited.

In view of the problems described above, the invention aims to to create a centrifuge with a space-saving and inexpensive anti-rotation device of the peeling disc outer part on the peeling disc shaft which also meets the requirements for sanitary cleaning.

separate" Arretierelemente verdrehsicher arretiert wird/werden. Eine separate Arretiervorrichtung entfällt somit. Allein durch die Geometriegebung des Schälseheibenschaftes sowie des Schälscheiben-Außenteiles wird nämlich bereits eine Verdrehsicherung erreicht. Die Geometrieausbildung erfordert an sich keine aufwendige Bearbeitung, denn bereits ein Außen- und Innenvierkant erfüllen die Aufgabe der Verdrehsieherung ohne jedes Problem. The invention achieves this aim by the subject matter of claim 1. The outer contour or the outer circumference of the peeling disc shaft and the inner contour or the inner circumference of the peeling disc outer part and / or the inner contours of other elements pushed onto the peeling disc shaft interlock such that the peeling discs -Exterior part and / or the other elements on the peeling disc shaft without additional

separate "locking elements are / are locked against rotation. A separate locking device is thus dispensed with. The geometry of the peeling shank shaft and the outer part of the peeling disc alone already provide protection against rotation. Geometry training in itself does not require any complex machining, since an outer and inner square already have to be fulfilled the task of twisting without any problem.

The invention also enables sanitary cleaning, since gaps and feather key connections be saved.

The invention has a particularly advantageous effect if the outer contour of the peeling disc shaft is designed essentially as a regular polygon (triangle, square, etc.) and if the inner contour of the outer part of the peeling disc deviates at least in sections from the polygonal outer contour of the peeling disc shaft such that between the outer and the inner contour of at least one of the discharge channels is formed. In this way, there is no need to shape the drainage channels separately. Rather, the discharge channels already arise during the shaping of the peeling shaft and the other elements fastened to the peeling disk shaft automatically "with.

Other elements that are placed on the peeling disc shaft are second peeling discs or lid conceivable. With these elements, too use advantageous square fuse.

The idea of channel training can be particularly simple through appropriate Realize the geometry in that the outer contour of the peeling disc shaft essentially rectangular - in particular square - and the inner contour of the peeling discs and / or the cover is round at least in sections is trained. Between a completely circular inner contour and one rectangular or even square outer contour of the peeling disc shaft coordinated dimensions are then created as four drainage channels Circular segments. In this case the outer part of the peeling disc is locked ensures on the peeling disc shaft that the square engages in recesses of the peeling disc outer part, which otherwise of the circular inner contour are introduced into the peeling disc.

In another version, the geometry of the peeling disc outer part Sections can also be changed in such a way that circle segments with little Diameters act as drainage channels, with the centers of these circle segments offset radially outwards from the center of the square are. Additional recesses in the inner circumference of the peeling disc outer part grasp the corners of the peeling disc shaft with this design on.

Further advantageous embodiments of the invention are the remaining subclaims refer to.

Fig. 1a

eine Schnittansicht von Elementen einer erfindungsgemäßen Zentrifuge;

Fig. 1b

einen zur Fig. 1a senkrechten Schnitt A-A durch eine erste Schälscheibe und ein Zulaufrohr;

Fig. 1c

einen zur Fig. 1a senkrechten Schnitt B-B durch den Deckel der Zentrifuge und das Zulaufrohr,

Fig. 2

einen Schnitt durch die erste Schälscheibe und das Zulaufrohr eines weiteren Ausführungsbeispieles der Erfindung.

The invention is described in more detail below using an exemplary embodiment with reference to the drawing. It shows:

Fig. 1a

a sectional view of elements of a centrifuge according to the invention;

Fig. 1b

a section AA perpendicular to FIG. 1a through a first peeling disk and an inlet pipe;

Fig. 1c

a section perpendicular to Fig. 1a BB through the lid of the centrifuge and the inlet pipe,

Fig. 2

a section through the first peeling disc and the inlet pipe of a further embodiment of the invention.

Fig. 1 shows a centrifuge designed as a separator, which is known per se For example, a centrifugal drum (only partially shown here, continued downwards) 2 for separating a centrifugal material into different components having. The centrifuge or the centrifugal liquid is shown in the illustration 1, for example, from above through a central inlet or an inlet pipe 4 in the direction of arrow P in the centrifugal drum 2.

The discharge of liquid emerging from the centrifugal drum 2 takes place in a peeling chamber 6 with the help of a peeling disc 8, which results from the interaction of the inlet pipe 4 - which in sections as part of the peeling disc shaft 10 serves - is formed with the peeling disc outer part 12 .. The peeling disc outer part 12 has a lower annular disk-like section 14, to which an axially extending, tubular extension 16 is formed, wherein the peeling disc shaft 10 completes the peeling slide 8 as a continuous inner part.

Discharge channels 18 are formed in the annular disk-like section 16 from the outer circumference of the peeling disc 8 to the inside and between Peeling disc shaft 10 and peeling disc outer part 12 in an axially upward direction passing section 18 '.

Axially above the peeling disc 8 is in a second peeling chamber 7 Inlet 22 a second peeling disc 24 placed over the inlet pipe 4, for example can serve to derive a second liquid phase. The second peeling disc 24 in turn has an annular disk-like section 26 to which a is integrally formed on axially extending, tubular extension 28.

In the annular disk-like section 26, drainage channels 30 are formed which extend from the lower outer circumference of the peeling disc 24 run inwards and in the tubular Approach 28 are extended upwards. Between the inner wall of the Peeling disk 24 and the outer wall of the inlet pipe 4 is also another axial extension 18 '' of the discharge channel 18 is formed upwards.

On the second peeling disc 24, a cover 32 is placed, which is also on the Inlet pipe 4 is pushed and between its inner wall and the outer wall of the inlet pipe four a further axial extension 18 '' of the discharge channel is trained. The discharge duct 18 or the extension 18 '' ' opens into a discharge ring chamber 34, from which the from the first peeling disc 8 detected first liquid phase is guided into a drain pipe 35. The Unit of the peeling discs 8.24 is clamped to the cover 32 by means of a nut 42.

The inlet pipe 4 is from the area of the first (or FIG. 1 of the lower) peeling disk 8 continuously to the discharge ring chamber 34 with a substantially square Provide outer contour. The corners of this outer contour are slightly chamfered (see square 36 in Fig. 1b, 1c and 2). The peeling disc outer part 12 has at least in sections has an inner diameter D, which is the diagonal X between two opposite corners 36 'and 36' 'of the square 36 is adapted (see. Fig. 1b and 1c). The channels 18 are thus in this area through the circular sectors 38 (see exemplary vertical dashing in FIG. 2 in the lower Sector 38 between square 36 and outer disc part 12) formed. Since there is no twist-proof locking on the peeling disc shaft in this axial area takes place because the inner circumference of the peeling disc outer part 12 and touch the diagonal position of the square 34 of the peeling disc shaft 10, it is necessary to cut the corners in sections using suitable geometry 36 of the square 34 to be locked against rotation. According to Fig. 1b and 1c, this is by projections formed on the inner circumference of the peeling disc or the cover 33 provided, which in turn with recesses 39 for receiving the corners 36 ', 36' 'of the square 36 are provided.

In the exemplary embodiment in FIG. 2, the anti-rotation lock is implemented by that the inner contour of the peeling disc outer part 12 in its upper axial Area, i.e. not continuous in the area of the tubular section 14 is circular. Rather, they are based on the circular Form four circular sectors K1, K2 provided, the radius of which is smaller than the radius D / 2 of the peeling disc outer part 12. The center M 'of the circular sectors K1, K2, K3, K4 radially opposite the center M of the square 36 after offset outside. As a result, the outer part of the peeling disc is also in this axial section Circle sectors K1, K2, K3, K4 (the upper of these sectors is K1 recognizable by an oblique dashed line) to divert liquid the peeling disc outer part 12 and the peeling disc shaft 10. The actual locking is done by additional cutouts 40 in the peeling disc outer part 12 reached. These millings are such that they cover the corners of the Border square 34. There is no need for a separate lock. The Square 34 can be cut by relatively uncomplicated milling of the outer circumference of the peeling disc shaft 10. The circle segments K could theoretically be designed as polygonal edges.

The fastening is also carried out analogously to the fastening of the outer peeling disc part 12 the second peeling disc 24 and the attachment of the lid 32 on the Inlet pipe 4. These elements also have an inner contour, which a twist-proof lock on the axially elongated outer square 36 allows. For this purpose, the second peeling disc 24 has in its lower region and the cover 32 in its upper area milled 40 in the corners of the square 36 on The advantageous square fuse extends here from the peeling disc outer part 12 to the discharge chamber 34.

Reference numerals

Centrifugal drum

2nd

Inlet pipe

4th

first peeling chamber

6

second peeling chamber

7

first peeling disc

8th

Peeling disc shaft

10th

Peeling disc outer part

12th

washer-like section

14

tubular approach

16

Discharge channel

18, 18 ', 18' ', 18' '',

Intake

22

second peeling disc

24th

washer-like section

26

tubular approach

28

Drainage channels

30th

cover

32

Ledges

33

Drainage ring chamber

34

Drain pipe

35

Square

36

Corners

36 ', 36' '

Circular sectors

38

Recess

39

Cutouts

40

mother

42

Circular sectors

K1, K2, K3, K6

Focus

11

radius

D

Diagonal

X

Claims (7)

Centrifuge, which has the following: a) a centrifugal drum (2) and b) at least one peeling disc (8) for discharging liquid from the centrifugal drum (2), c) wherein the peeling disc (8) comprises a peeling disc shaft (10) and a peeling disc outer part (12), between which or in which at least one discharge channel (18) is formed,
characterized in that d) the peeling disc shaft (10) and the peeling disc outer part (12) and / or at least one further element (24, 32) pushed onto the peeling disc shaft between the peeling disc (8) and a discharge chamber (34) such that the peeling disc outer part (12) and / or the further element (24, 32) is / are locked against rotation on the peeling disc shaft (10). Centrifuge according to claim 1 or according to the preamble of claim 1, characterized characterized in that the outer contour of the peeling disc shaft (10) in is essentially designed as a regular polygon, with the inner contour of the peeling disc outer part (12) and / or the further element (24, 32) at least in sections from the outer contour of the peeling disc shaft (10) deviates that at least between the outer and the inner contour one of the discharge channels (18) is formed. Centrifuge according to claim 2, characterized in that the outer contour of the Peeling disc shaft (10) essentially rectangular, preferably square, and the inner contour of the peeling disc outer part (12) and / or that of other elements (24, 32) at least in sections essentially circular are trained. Centrifuge according to one of the preceding claims, characterized in that that the further elements at least one further peeling disc (24) and one Cover the lid. Centrifuge according to one of the preceding claims, characterized in that that the corners of the outer contour of the peeling disc shaft (10) are slightly chamfered are. Centrifuge according to one of the preceding claims, characterized in that that the at least one peeling disc (8) and / or the further elements (24, 32) have an inner diameter (D) at least in sections, which is essentially the length of the diagonal (G) between two each other opposite corners (36 ', 36' ') of the rectangular cross section of the peeling disc shaft (10) corresponds. Centrifuge according to one of the preceding claims, characterized in that that the peeling discs (8,24) and / or the cover (32) in sections Have inner diameter which is smaller than the outer diameter of the Peeling disc shaft (10) with additional recesses (40) in the inner circumference of the peeling disc outer part (12) are formed which cover the corners (36 ', 36' ') of the peeling disc shaft (10).

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