HU207464B - Filtering member particularly for sludge-layer filters - Google Patents

Abstract

The filter element comprises a hollow body with perforated enclosure and a discharge connection supported by at least two collars. These are parallel to each other and are provided with stiffener rods. The rods are termination at two base plates located at the ends of the bo

Description

The present invention relates to a filter element, particularly for sludge filters.

One of the most modern and effective means of purifying industrial waters is sludge filtration. The essence of this is that the liquid to be filtered is passed through a filter sludge bed. In mud-bed filters, the mud-perforated supports, e.g. screen inserts or spark plugs coated with sieve cloth applied to its filter mantle (sludge). The sludge layer is supported by the pressure of the liquid to be filtered and by the friction of sludge particles between each other and the support member (see, e.g., ILLÉS, KELEMEN, VISA: Industrial Water Management, VIZDOK, Bp., 1983, pp. 149-161).

The filter mantle of sludge-bed filters is generally vertical, since in a horizontal arrangement, very large dimensions would be produced, with little performance compared to the dimensions. An example of the use of vertical filter coats is Dr. CHOVANETZ: Industrial Water Treatment. (MK, Bp., 1979, pp. 81-84) and Hungarian Patent Application No. 194064.

Sludge filters using a vertical filter mantle are relatively small in size and powerful in size. However, they have the disadvantage that due to the vertical arrangement, the thickness of the sludge layer that can be applied or can remain without tearing is limited, so that the cleaning capacity (stored sludge mass) is small. Another disadvantage is that the generally flexible filter envelope makes the filter apparatus sensitive to load fluctuations. A change in load means a change in pressure to which the flexible filter mantle reacts with vibrations. As a result, even a relatively thin filter slurry layer may crack or peel off, resulting in deterioration of filtrate quality.

It is an object of the present invention to overcome these drawbacks.

It is therefore an object of the present invention to provide a filter element which, in vertical filter coats, enables the thickness of the filter sludge layer to be increased and the risk of peeling to be reduced.

SUMMARY OF THE INVENTION The object of the present invention is to provide a filter element, in particular for mud filters, which has a hollow body having a perforated filter body and a connector connecting the body cavity with drainage and having a support plate which is angled with the filter body.

In some cases, it is advantageous for the support plate to be formed as an endless collar surrounding the body.

In other cases, it is preferable to use at least two parallel support plates.

It is also advantageous to have spacers, preferably stiffeners, between the support plates. In a preferred embodiment, the support plate is a spiral band surrounding the body.

Finally, it is advantageous to have at the end of the body a base plate which is preferably parallel to the support plate.

The invention will now be described by way of example only with reference to the accompanying drawings. The

Figure 1 is a side view of the filter element of the first example, and a

Figure 2 is a side view of the second example filter element.

The filter element according to Fig. 1 has a cylindrical body (1) with a perforated wall, one end of which is provided with a closed end and the other end (5) which is connected by a drain (not shown).

Body (1) is e.g. it may be made of axially ribbed, perforated tube between the ribs. The material is preferably stainless steel. The ribs (not shown) have a thin wire in one layer with a low pitch, tightly wound. The liquid enters through the gaps between the threads and the perforations into the body cavity (1), where it is discharged through the connector (5). The filter element shown here occupies one or more vertically parallel containers in a closed container (not shown). The fluid to be filtered or the filter material suspension and the rinse liquid are introduced into the container in the usual manner.

The two ends of the body (1) are provided with a circular base plate (4) having a plane perpendicular to the longitudinal axis of the body (1) and arranged concentric to this axis. Between the two baseplates (4) there are arranged parallel plates (2), which are parallel to each other and to the body (1) as infinite collars. The inner flange of the support plates (2) is aligned with the outer surface of the body (1) forming the filter mantle (similarly, the base plates (4) are fitted to the body (1)), The outer plates (2) and the base plates (4)

Between the adjacent support plates (2) and between the two outermost support plates (2) and the adjacent base plate (4) are provided stiffening rods (3), which are preferably continuous with each other, e.g. They are 120 ° apart.

The base plates (4), the support plates (2) and the reinforcing bars (3) may be made of plastic (eg plexiglass).

During sludge deposition, the filter sludge layer is housed in annular chambers formed by base plates (4) and support plates (2). In this way, it is not only friction and fluid pressure that holds it on the filter mantle and can be many times its thickness. At the same time, the sensitivity to load changes is reduced because any vibrations in the filter envelope cannot shake the filter slurry from the annular chambers. Since the filter element is insensitive to these changes, the parameters of the applied filter sludge layer can vary within wide limits, which means that the same equipment can use a wide variety of mixed and even multi-layered filter sludges, which greatly extends the field of application of sludge filters.

The filter element of Fig. 2 differs from that of Fig. 1 in that the support plate (2) is a spiral band wrapped around the body (1) with a thread pitch. In this case, stiffeners (3) or other spacers are not required, as the spiral tape can be self-supporting by suitable dimensions.

HU 207 464 Β

The support plates (2) do not need to be combined with the body (1), so they can be retrofitted to existing filter elements. Of course, the support honey (2) can also be applied to filter plates and other filter surfaces.

The present invention breaks down large sludge layers into subassemblies along the entire height of the filter surface and supports the subassemblies separately against the weight, thereby increasing the vertical size of the vertical filter coats to almost any desired increase in filtration performance with the same floor space requirement. (in addition to the performance enhancement resulting from the increase in layer thickness).

The invention has been described above in connection with vertical filter coats, but of course it is preferable in all cases where the filter surface is not horizontal. The support plates may be angled at an angle other than 90 ° to the filter housing. Additional dividing plates which are perpendicular or at an angle other than 90 ° may be used between the support plates in the form of a collar.

Claims (6)

PATENT CLAIMS A filter element, in particular for sludge filters, having a body having a perforated filter body and a connection connecting the body cavity with drainage, characterized in that the body (1) is angled with a support plate (2). Filter element according to claim 1, characterized in that the support plate (2) is an endless collar surrounding the body (1). The filter element according to claim 2, characterized in that it has at least two parallel support plates (2). Filter element according to claim 3, characterized in that spacer elements, preferably stiffeners (3), are inserted between the support plates (2). Filter element according to Claim 1, characterized in that the support plate (2) is a spiral band surrounding the body (1). 6. Filter element according to one of Claims 1 to 3, characterized in that a single base plate (4), preferably parallel to the support plate (2), is provided at both ends of the body (1).