DE3505447A1 - Filling apparatus for unfiltered medium in multi-stage pressure filters - Google Patents

Abstract

The invention relates to an apparatus for filling filter chambers of multi-stage pressure filter presses, preferably having a movable filter cloth, which enables the filter frame corresponding to the prior art to be dispensed with. A filling pipe, which is surrounded by an elastic shaped piece, serves to achieve this object of the invention which filling pipe, on closing the filter press, is clamped in a pressure-tight manner in recesses provided for this purpose in the peripheral walls of the filter chambers. In a different structural variant of the invention, the same function is carried out by a flexible filling hose having elastic walls.

Description

Description:

Eta pressure filters are known, each of which has between two Filter chambers 1 a filter frame 2 is arranged. Once the filter cake has built up 3 the filter press is opened and there are gaps between the filter chambers 1 and filter frame 2, so that by moving the filter cloth 4b to the side Seal the filter cake is transported and finally ejected from the machine will.

On automated versions of filter presses, the filter cloths are 4a and 4b sections of an endless cloth that zigzag between the superimposed Filter chambers and filter frame lies. Figure 1 shows the pilter chamber filter frame - Arrangement in longitudinal section with the filter press closed, Figure 2 represents the Discharge of the filter cake when the filter press is open.

Figure 3 shows the filter chamber-filter frame arrangement with the closed Filter press in cross section, i.e. perpendicular to the direction of discharge of the filter. 5 a is the filling opening for the unfiltrate, its dry matter content remains on the filter cloths 4a and 4b and there the structure of the filter ciichens causes the liquid component to flow through the filter cloths, from which it acts as a fluting executed drainage structure of the filter chambers is added and collected to then leave this through the drainage holes 5 b.

The drainage structure of the filter chambers is shown in the pictures shown simplified by a zigzag line.

A major disadvantage of the filter chamber-filter frame arrangement described consists in the presence of the filter rim itself, which according to the state of the Technology is essential to bring the unfiltrate between the filter trays to be able to, but the filter press is more expensive because devices are required which connect the filter frame with the filter elements, here prescribed Maintain distances and at the same time also have to be able to Absorb shear forces.

In order to improve this prior art, according to the invention proposed a filling device for the unfiltrate, which efllbri: gt the filter frame.

Fig.4a shows this device in the cross section of the filter chambers, that is perpendicular to the cake transport device, Fig.ab shows this device in the Side view of the filter chambers. In contrast to the previous filter chambers The filter chambers and filter frame arrangements have the filter chambers 8 and 9 in the shape of a bowl Wells, so that enclosing walls are formed which surround the filter cake. The filter cloth sections 4a and 4b surrounding the filtration space are between the frontal and parallel to the drainage surfaces (by zigzag line shown) extending surfaces of these enclosing walls clamped pressure-tight.

The filling device on which the invention is based consists in the variant shown in Fig. 4a and 4b consisting of a filling pipe for the unfiltrate 6, which consists of a molded part 7 in the area of the surrounding walls of the filter chambers is surrounded by elastic material. If, when closing the filter press, the filter elements 8 and 9 are moved towards one another, the molded part 7 is approximately semicircular between or oval recesses 10 (Fig.4b) of the surrounding walls of the filter chambers 8 and 9 pinched.

The pretensioning of the elastic molded part 7 effected in this way takes place a sealing effect takes place which allows the unfiltrate to pass through the filler pipe 6 to be fed to the filter cavity under pressure after the filter cake has formed and after opening the filter press, the molded part 7 is relaxed. To the between molding 7 and the recesses 10 in the surrounding walls of the filter chambers Filter cloths 4a and 4b full mobility again, e.g. for ejecting the filter cake is to be procured in the case of the one shown Variant a device required that the filler pipe 6 together with the molded part 7 from the recesses 10 of the Enclosing walls moved out. This device consists of a parallel guide with stop, both structural elements are symbolically 15 and 16 in Fig.4a dar ## e5tellt, and spring elements that generate the movement, and which are also symbolic with 17 in Fig.4a d2: e are set. 14 is a Sinlbild for the holder of this device on the filter chamber 8. Without any fundamental change, this aging can also occur the lower filter chamber 9 be attached.

In a further improvement of this invention, the molding 7 with sealing lips connected one behind the other over its entire circumference 18 in Fig. 5, which improves the sealing effect through improved contact the sealing surface is increased.

Another constructive variant of the invention provides a flexible one - and radially elastic hose 19, which is connected to a bracket 20 in Fig the filter chamber 8 or 9 is connected. Compartment closing the filter press is this hose is clamped pressure-tight in the recesses of the surrounding walls, so that the filling process can take place under pressure through the hose.

To prevent deformation of the clear hose cross-section, a shape-retaining pipe section 24 made of rigid material can be inserted into the hose be inserted. To improve the sealing effect, the hose can be placed on its Surface in the area of the surrounding walls of the filter chambers 8 and 9 with one behind the other switched sealing lips. Because of his sideways movement and his After opening the filter press, the hose assumes a position, spring return, which hinder neither the upper filter cloth 4a nor the lower filter cloth 4b.

Claims (7)

Claims 1. Filling device for unfiltrate in floor pressure filters, characterized in that a filler pipe with a circular or oval cross-section in the area of the surrounding walls of the filter chambers with a molded piece made of elastic Material is surrounded, which is shaped so that it is after closing the filter press between semi-circular or semi-oval recesses of the surrounding walls Filter chambers is clamped pressure-tight and similar to a plug the filter cavity with the filter cloths surrounding it from the inside. 2. Sinfüllvorrichtung according to claim 1, characterized in that the filler pipe is equipped with a parallel guide with a stop and with a Filter chamber is connected, the movement being through one or more spring elements is triggered, so that the filler pipe when opening the filter press from what Area of the recesses in the surrounding walls of the filter chambers removed that the filter cloths can move freely. 3. Filling device according to claims 1 and 2, characterized. that the elastic molded part surrounding the filler pipe in the region of the recesses one or more of the surrounding walls of the filter chambers over its entire circumference has rear sealing lips interconnected in their effect. 4. Filling device for Unfiltra't in floor pressure filters, thereby characterized in that a flexible hose with an elastically deformable wall over a rigid bracket is attached to a filter chamber so that it is closed when it is closed the filter press between openings in the outer walls of the filter chambers Is clamped pressure-tight and when opening the filter press due to its elastic Restoring forces releases the filter cloths. 5. Filling device according to claim 4, characterized in that the hose through in the area of the surrounding walls of the filter chambers from the inside inserted non-compliant fitting supported in the form of a pipe section will. 6. filling device according to claim 4 and 5, characterized in that that the hose in the area of the Ltmfasswand on its outer circumference with a or several sealing lips is provided. 7. Filling device for unfiltrate in floor pressure filters according to claims 1 to 6, characterized in that the recesses in the Umfassamnden Filter chambers widen conically inwards and those with these recesses in contact. th surfaces of the clamped here when closing the filter press Components, molded part or hose also move inwards, i.e. in the direction Filter cavity, expand conically.