CN210674440U

CN210674440U - Disc filter

Info

Publication number: CN210674440U
Application number: CN201920344532.5U
Authority: CN
Inventors: R.哈特曼
Original assignee: Voith Patent GmbH
Current assignee: Voith Patent GmbH
Priority date: 2018-03-19
Filing date: 2019-03-18
Publication date: 2020-06-05
Anticipated expiration: 2029-03-18
Also published as: FI12399U1; AT16600U1; DE202018101506U1

Abstract

The invention relates to a disc filter for separating liquids from suspensions, in particular fibrous suspensions, having a container for receiving the suspension, a rotatably mounted hollow shaft extending horizontally in the container, a plurality of filter disks which are fastened vertically to the hollow shaft and are spaced apart from one another in the axial direction, and a material outlet arranged between the filter disks, the interior of which is connected to the hollow shaft, wherein one or more guide elements are fastened to the outer circumference of the filter disks, and one or more guide counter-elements are arranged on the container relative to the guide elements, so that when the filter disks rotate, at least one guide element is guided by the guide counter-element in such a way that the axial deflection of the filter disks is limited in the region.

Description

Disc filter

Technical Field

The invention relates to a disc filter for separating liquids from suspensions, in particular fiber suspensions, having a container for receiving the suspension, a hollow shaft which extends horizontally in the container and is rotatably mounted, a plurality of filter discs which are fastened vertically to the hollow shaft and are spaced apart from one another in the axial direction, and a material outlet which is arranged between the filter discs, the interior of the filter discs being connected to the hollow shaft.

Background

Such disc filters are used for concentrating suspensions and in particular for fiber recovery in the paper industry.

For this purpose, the hollow shaft is usually connected to a source of underpressure. Due to the pressure difference between the fibre suspension and the inner space of the filter disc, a non-woven layer is formed on the filter disc. When the filter discs are immersed in the fibre suspension, as much as possible only water enters the interior space of the filter discs and subsequently the hollow shaft. The nonwoven layer is removed by a scraper when it is exposed and is guided to the corresponding material outlet or sprayed with water.

In this case, it is disadvantageous that a region with a higher material density is formed in the region of the narrow point between the material outlet and the filter disk, which leads to a higher mechanical loading of the filter disk, in particular in the axial direction, which can lead to damage and increased wear.

The increase in the loadability of the filter discs is greatly limited only by the permeability of the filter discs.

SUMMERY OF THE UTILITY MODEL

The object of the invention is therefore to reduce the mechanical load on the filter disks with the least possible effort.

The object is achieved according to the invention by a disc filter, wherein one or more guide elements are fixed to the outer circumference of the filter disc, and one or more guide counter elements are arranged on the container opposite the guide elements, such that when the filter disc rotates, at least one guide element is guided by the guide counter element in such a way that an axial deflection of the filter disc is limited in the region.

In this way, an axial overload of the filter discs occurs very efficiently and effectively.

The guide element can advantageously be formed by a continuous strip running in the circumferential direction or by a plurality of strips running in the circumferential direction, arranged one behind the other and spaced apart from one another.

If a plurality of slats are present, the exchange of the suspension in the narrow region with the rest of the container in the region of the material outlet can be intensified by the slats. An excessively strong increase in the material density in the region of the narrow region can thus at least be prevented.

In a particularly simple embodiment, the guide counter element is formed by at least one track extending in the direction of rotation in the container, the guide element at least partially covering the track in the radial direction.

If only one guide rail is present, the axial delimitation in both axial directions of the possible deflection can be achieved in that the strip-shaped guide element has a groove running in the circumferential direction, into which the guide counter element projects.

If the guide element is formed by a plurality of circumferentially spaced slats, it may be important that the slats make contact with the track, which normally extends only over the peripheral section of the filter disc, upon rotation. Therefore, the width of the groove should increase at least toward the end in the rotational direction.

It is furthermore advantageous if the strips have a dimension in the circumferential direction of the filter disk of between 50 and 250mm, preferably between 50 and 150mm, and/or if the strips have a height of less than 120mm, preferably less than 70 mm.

Drawings

The invention is explained in more detail below with the aid of exemplary embodiments. In the drawings:

fig. 1 shows a schematic side view of a disc filter;

FIG. 2 shows a top view of a disc filter;

fig. 3 shows a cross-sectional view through the guide element 3 and the guide counter element 2; and

fig. 4 shows a top view of the guide element 3.

Detailed Description

The fibre suspension 7 is introduced into the vessel 8 of the disc filter according to fig. 1 through an inlet 10. In the vessel 8, a horizontally extending and rotatably mounted hollow shaft 5 is present, which has a plurality of axially spaced filter disks 1.

The filter disc 1 is formed by two disc-shaped perforated filter elements which delimit the interior of the filter disc 1. The filter disc 1 itself is composed of a plurality of segments, which together produce the shape of a circular ring.

In order to be able to remove water from the suspension 7, the hollow shaft 5 connected to the negative pressure source is connected to the interior of the filter disc 1.

The nonwoven layer formed on the filter element is transported to the material outlet 4 after emerging from the suspension 7.

For this purpose, the material outlets 4 are each located between two adjacent filter disks 1, as can be seen in fig. 2.

The material outlet 4 is formed by the filter disc 1 in each case with a narrow region, which results in a region of higher consistency. The filter elements of the filter disc 1 are thus subjected to higher mechanical loads when passing through these regions.

In order to minimize the load acting substantially axially on the filter element, the exchange of the suspension 7 in the narrow region with the suspension 7 in the remaining part of the vessel 8 is reinforced by a plurality of guide elements 3 which are fixed to the filter disc 1. This therefore ultimately leads to a more uniform distribution of the material density of the suspension 7 in the container 8.

According to fig. 3 and 4, a plurality of short, circumferentially extending strips are used as guide elements 3, which are fixed in a uniformly distributed manner on the outer circumference of the filter disc 1. The connecting elements between the segments of the filter disk 1 are also suitable for fastening.

In order to prevent too strong axial deflections of the filter disc 1 during rotation, a guide counter element 2 in the form of a rail extending in the direction of rotation 6 is respectively fixed on the receptacle 8 relative to the guide element 3, the guide element 3 partially covering the rail in the radial direction.

The track extends only in the region of the suspension 7, since only axial deflections are to be expected there. Even in most cases, it is achieved that the track extends only over a part of the peripheral area of the filter disc 1 which is located in the suspension 7.

For axially guiding the filter disks 1 in both axial directions, the strip-shaped guide elements 3 have circumferentially extending grooves 9, into which the rail-shaped corresponding guide elements 2 project.

In order to securely guide the counterpart element 2 into the groove 9, the width of the groove 9 is increased here towards both ends. If the end pointing in the direction of rotation 6 wears, the strip remains usable also after a 180 ° turn.

The best effect of the strip-shaped guide element 3 is obtained when the strip-shaped guide element extends in the circumferential direction between 50 and 150mm and has a height in the radial direction of less than 70 mm.

Claims

1. A disc filter for separating liquids from suspensions (7) having a container (8) for receiving the suspension (7), a rotatably mounted hollow shaft (5) extending horizontally in the container (8), a plurality of filter discs (1) which are fastened vertically to the hollow shaft (5) and are axially spaced apart from one another and material outlets (4) which are arranged between the filter discs (1) and the interior space of which is connected to the hollow shaft (5), characterized in that one or more guide elements (3) are fixed on the outer circumference of the filter disc (1), and one or more guide counter-elements (2) are arranged on the container (8) opposite the guide elements, so that when the filter disc (1) rotates, the at least one guide element (3) is guided by the guide counter element (2) in such a way that the axial deflection of the filter disc (1) is limited in the region.

2. A disc filter according to claim 1, characterised in that the guide element (3) consists of a continuous strip extending in the circumferential direction.

3. A disc filter according to claim 1, characterised in that the guide element (3) consists of a number of circumferentially extending slats arranged one behind the other and spaced apart from each other.

4. A disc filter according to any one of claims 1 to 3, characterised in that the guide counter-element (2) consists of at least one track extending in the direction of rotation (6), the guide element (3) at least partially covering the track in the radial direction.

5. A disc filter according to claim 2, characterised in that the strip-shaped guide elements (3) have circumferentially extending grooves (9) into which the guide counter elements (2) project.

6. A disc filter according to claim 5, characterised in that the width of the groove (9) increases at least towards the end in the direction of rotation (6).

7. A disc filter according to claim 3, characterised in that the slats have a dimension in the circumferential direction of the filter disc (1) of between 50 and 250 mm.

8. A disc filter according to claim 3, characterised in that the height of the slats is less than 120 mm.

9. A disc filter according to claim 1, characterised in that the suspension (7) is a fibre suspension.

10. A disc filter according to claim 3, characterised in that the slats have a dimension in the circumferential direction of the filter disc (1) of between 50 and 150 mm.

11. A disc filter according to claim 3, characterised in that the height of the slats is less than 70 mm.