ASSEMBLY COMPRISING A FILTER PLATE AND AN ATTACHMENT PART

Abstract

An assembly comprising a filter plate for filter press and at least one attachment part, wherein the filter plate has a filter chamber boundary surface, by means of which a filter chamber to be formed in the filter press can be bounded. At least one channel for a fluidic connection to the filter chamber boundary surface is formed in the filter plate, and the attachment part is detachably fastened to the filter plate at the channel by means of at least one detachable ball-type snap-in connection. The ball-type snap-in connection comprises at least one ball pin and at least one coupling. An assembly comprising such a filter plate for a filter press and at least one attachment part, in which the attachment part is detachably fastened to the filter plate by means of at least one ball-type snap-in connection and has an opening which is arranged in the channel.

Claims

1. An assembly comprising: a filter plate for a filter press and at least one attachment part, wherein the filter plate has a filter chamber boundary surface, by which a filter chamber to be formed in the filter press can be bounded, at least one channel for a fluidic connection to the filter chamber boundary surface is formed in the filter plate, and the attachment part is fastened to the filter plate at the channel, wherein the attachment part is detachably fastened to the filter plate by at least one detachable ball-type snap-in connection, the ball-type snap-in connection comprising at least one ball pin and at least one coupling.

2. The assembly according to claim 1, wherein the attachment part has an opening, which is arranged in the channel.

3. The assembly according to claim 1, wherein the attachment part is a distributor ring and the channel is an infeed channel for supplying the suspension that is to be filtered into the filter chamber, wherein the suspension that is to be filtered can be supplied to the filter chamber by the distributor ring.

4. The assembly according to claim 1, wherein the attachment part is a support ring, and the channel is an infeed channel for supplying the suspension that is to be filtered into the filter chamber, the support ring arranged adjacently to a distributor ring, through which the suspension that is to be filtered can be supplied to the filter chamber.

5. The assembly according to claim 1, wherein the attachment part is formed as a supporting cam.

6. The assembly according to claim 2, wherein the filter plate has a first contact face around an opening forming the channel, and the attachment part has a second contact face around the opening, and in that the ball-type snap-in connection is formed in the region of the first and second contact faces, such that, when the attachment part is connected to the filter plate, the first and second contact faces are held in abutment against one another.

7. The assembly according to claim 6, wherein a ring seal is arranged between the filter plate and the attachment part at the first and second contact faces.

8. The assembly according to claim 1, wherein the attachment part is an abrasion protection means.

9. The assembly according to claim 8, wherein the channel is a discharge channel for discharging the filtrate from the filter chamber and the abrasion protection means is arranged on or at the discharge channel or at an outfeed opening of the discharge channel.

10. The assembly according to claim 1, wherein the coupling is made of an elastomer.

11. The assembly according to claim 1, wherein the ball pin comprises a stem, which is adjoined by a spherical termination element and the coupling comprises a ball socket for receiving the spherical termination element.

12. The assembly according to claim 11, wherein the coupling has an entry opening for the spherical termination element of the ball pin and the maximum transverse extent of the spherical termination element is greater than the maximum transverse extent of the entry opening of the coupling.

13. The assembly according to claim 1, wherein the attachment part is fastened to the filter plate by a plurality of ball pins and corresponding couplings, wherein the ball pins and the corresponding couplings are arranged around an opening of the attachment part and an outlet opening of the channel.

14. An assembly comprising: a filter plate for a filter press and at least one attachment part, wherein the filter plate has a filter chamber boundary surface, by which a filter chamber to be formed in the filter press can be bounded, at least one channel for a fluidic connection to the filter chamber boundary surface is formed in the filter plate, and the attachment part is fastened to the filter plate at the channel, wherein the attachment part is detachably fastened to the filter plate by at least one snap-in connection, and wherein the attachment part has an opening, which is arranged in the channel, and the attachment part is fastened to the filter plate by at least one detachable ball-type snap-in connection.

15. The assembly according to claim 14, wherein the ball-type snap-in connection comprises an annular pin-like protrusion and a ring groove associated with the protrusion.

16. The assembly according to claim 15, wherein the annular pin-like protrusion in a cross-section formed perpendicularly to its peripheral direction has an eyebolt, which is adjoined by a spherical annular termination element.

17. The assembly according to claim 15, wherein the ring groove has an annular first entry opening to an annular first groove hollow body, wherein the maximum transverse extent of the first entry opening in a cross-section formed perpendicularly to the circumferential direction of the ring groove is smaller than the maximum transverse extent of the first groove hollow body with this cross-section.

18. The assembly according to claim 15, wherein in that the ring groove is dovetail-shaped.

19. The assembly according to claim 15, wherein the ball-type snap-in connection comprises an annular adapter ring, which is formed correspondingly to the ring groove.

20. The assembly according to claim 19, wherein the adapter ring is made of an elastomer.

21. The assembly according to claim 19, wherein the adapter ring, in a cross-section formed perpendicularly to its circumferential direction, has an outer face which corresponds to the inner face of the ring groove, such that the adapter ring can be inserted into the ring groove, and a further ring groove, which has an annular second entry opening to an annular second groove hollow body, is formed in the adapter ring, wherein the maximum transverse extent (A) of the second entry opening in a cross-section formed perpendicularly to the circumferential direction of the adapter ring is smaller than the maximum transverse extent (F) of the second groove hollow body with this cross-section.

22. The assembly according to claim 21, wherein the maximum transverse extent of the spherical annular termination element is greater than the maximum transverse extent (A) of the second entry opening of the adapter ring.

23. The assembly according to claim 21, wherein the adapter ring has an inner face forming the second groove hollow body, which inner face corresponds to the surface of the annular pin-like protrusion, such that the annular pin-like protrusion can be inserted into the second groove hollow body.

24. The assembly according to claim 15, wherein the annular pin-like protrusion is arranged on the attachment part and the ring groove is arranged on the filter plate.

25. The assembly according to claim 14, wherein the attachment part is a distributor ring and the channel is an infeed channel for supplying the suspension that is to be filtered into the filter chamber, wherein the suspension that is to be filtered can be supplied to the filter chamber by means of the distributor ring.

26. The assembly according to claim 14, wherein the attachment part is a support ring and the channel is an infeed channel for supplying the suspension that is to be filtered into the filter chamber, wherein the support ring is arranged adjacently to a distributor ring, through which the suspension that is to be filtered can be supplied to the filter chamber.

27. The assembly according to claim 14, wherein the attachment part is formed as a supporting cam.

28. The assembly according to claim 14, wherein the filter plate has a first contact face around an opening forming the channel, and the attachment part has a second contact face around the opening, and in that the ball-type snap-in connection is formed in the region of the first and second contact faces, such that, when the attachment part is connected to the filter plate, the first and second contact faces are held in abutment against one another.

29. The assembly according to claim 28, wherein a ring seal is arranged between the filter plate and the attachment part at the first and second contact faces.

30. The assembly according to claim 14, wherein the attachment part is an abrasion protection means.

31. The assembly according to claim 30, wherein the channel is a discharge channel for discharging the filtrate from the filter chamber and the abrasion protection means is arranged in or at the discharge channel or at an outfeed opening of the discharge channel.

Description

[0052] The invention will now be explained on the basis of exemplary embodiments with reference to the drawings.

[0053] FIG. 1 schematically shows the general structure of an edge region of a filter plate pair for a filter press, wherein the infeed channel for the slurry is arranged outside the sealing edge,

[0054] FIG. 2 shows a first exemplary embodiment of the assembly according to the invention, in which the infeed channel for the slurry is arranged in the middle of the filter plate,

[0055] FIG. 3 shows the detail D from the depiction of FIG. 2,

[0056] FIG. 4 shows a plan view of the assembly from FIG. 2, wherein the distributor ring is fastened to the filter plate,

[0057] FIG. 5 shows the section B-B from the depiction of FIG. 4,

[0058] FIG. 6 shows the detail C of the sectional view of FIG. 5,

[0059] FIG. 7 shows a second exemplary embodiment of the assembly according to the invention,

[0060] FIG. 8 shows the distributor ring of the second exemplary embodiment of the assembly shown in FIG. 7,

[0061] FIG. 9 shows an adapter ring of the second exemplary embodiment of the assembly according to the invention shown in FIG. 7,

[0062] FIG. 10 schematically shows the cross-section of the adapter ring of the assembly according to the invention shown in FIG. 9,

[0063] FIG. 11 shows a sectional view of the second exemplary embodiment of the assembly according to the invention, in which two distributor rings are connected to the filter plate on both sides thereof,

[0064] FIG. 12 shows a detail of the sectional view of FIG. 11,

[0065] FIG. 13 shows a third exemplary embodiment of the assembly according to the invention,

[0066] FIG. 14 shows the detail E of the third exemplary embodiment of FIG. 13, and

[0067] FIG. 15 shows an abrasion protection means of the third exemplary embodiment of the assembly according to the invention shown in FIG. 13.

[0068] The general structure of a filter plate pack 1 with an arrangement in a filter press will be described first with reference to FIG. 1:

[0069] The filter plate pack 1 comprises a membrane filter plate 2 and a chamber filter plate 3. The filter plate pack 1, however, may also be formed by other combinations of filter plates, for example from a plurality of chamber filter plates 3. The filter plates 2 and 3 comprise a main body 4. In the chamber filter plate 3 the main body 4 may also be the filter plate itself. In the example shown in FIG. 1 an infeed channel 5 for the suspension that is to be filtered, which is also referred to as a slurry, is formed in the edge region of the main body 4. This infeed channel 5 may also be formed centrally in the middle of the filter plates 2 and 3, as will be explained later. A filter chamber 6 is formed between the membrane filter plate 2 and the chamber filter plate 3 and is delimited on one side by a filter chamber boundary surface 32. In the filter chamber 6, a filter cloth 7 is fastened in a groove of the membrane filter plate 2 by means of a fastening element provided at the edge. A filter cloth (not shown) is also arranged in the chamber filter plate 3, adjacently to the filter chamber boundary surface 32.

[0070] A distributor ring 9 is inserted into the chamber filter plate 3. The distributor ring 9 has a plurality of distribution channels 21, which provide a fluidic connection from the infeed channel 5 into the filter chamber 6, as is shown in FIG. 2. A support ring 10 is arranged adjacently to the distributor ring 9, such that the distributor ring 9 and the support ring 10 are clamped sealingly between the membrane filter plate 2 and the chamber filter plate 3. In this way, the filter chamber 6 is closed off by the distributor ring 9 and the support ring 10, such that on the inflow side to the infeed channel 5 a fluidic connection exists only via the distribution channels 21 of the distributor ring 9.

[0071] The filtration path 8 is also shown in FIG. 1. The suspension is supplied to the infeed channel 5. From there, the suspension passes via the distribution channels 21 of the distributor ring 9 into the filter chamber 6. The liquid component of the suspension passes through the filter cloth 7 and is discharged via collection channels of a membrane (not shown). The collection channels are connected to filtrate bores 11 (see FIG. 2) via discharge channels 34 for the filtrate, and the filtrate is discharged via said filtrate bores.

[0072] The infeed channel 5 may be formed not only in the region of the sealing edge in the filter plates 2 and 3. It is also possible that the infeed channel is formed centrally in the middle of the filter plates 2 and 3. The general structure of such a filter plate pack is known per se and is described for example in WO 2009/012884 A1.

[0073] The conventional filter plates, as described for example in WO 2009/012884 A1 or WO 2006/111378 A1, are attachment parts such as the distributor ring 9 or the support ring 10 are fastened by means of inserted connection elements or screws. In the case of the filter plate according to the invention an attachment part, such as the distributor ring 9, is connected differently, as will be explained hereinafter on the basis of a first exemplary embodiment with reference to FIGS. 2 to 6:

[0074] In the example shown in FIG. 2 the chamber filter plate 3 comprises a central infeed channel 5. The infeed channel 5, however, could also be arranged equally at the edge, as described with reference to FIG. 1. The filtrate bores 11 are arranged in the corners in FIG. 2.

[0075] The distributor ring 9 is fastened as attachment part to the main body 4 of the chamber filter plate 3 or to the chamber filter plate 3 itself. To this end, a first contact face 14 is formed on the main body 4 around the infeed channel 5. Ball pins 12 are arranged on this first contact face 14, concentrically around the infeed channel 5, and protrude from the first contact face 14.

[0076] A second contact face 15, corresponding to the first contact face 14, is formed at the distributor ring 9 and has couplings 13 arranged on it, which correspond to the ball pins 12 of the main body 4. The couplings 13 are integrated in the distributor ring 9. Although the couplings 13 and the distributor ring 9 are made of different materials, they are formed integrally. In order to fasten the distributor ring 9 to the main body 4, the distributor ring 9 is fitted with the couplings 13 onto the ball pins 12 such that the distributor ring 9 is fastened to the main body by means of detachable ball-type snap-in connections. The ball-type snap-in connections between the ball pins 12 and the couplings 13 are formed such that the first and second contact faces 14, 15 are pressed against one another.

[0077] A ring seal 18 is arranged at the first contact face 14 around the infeed channel 5, such that a sealing connection to the distributor ring 9 is produced as the distributor ring 9 is fastened to the main body 4. The ring seal 18 may be formed here by a groove and a round cord in the first contact face 14.

[0078] The distributor ring 9 has an opening 20, which adjoins the infeed channel 5 when the distributor ring 9 is fastened to the main plate 4. Suspension can pass from this opening 20 into the distribution channels 21 of the distributor ring 9 and can be suppled from there to the filter chamber 6.

[0079] The fastening of the distributor ring 9 is shown in detail in FIG. 4 and the sectional views of FIGS. 5 and 6. A distributor ring 9, 9 is fastened on each side of the main body 4 of the chamber filter plate 3. As can be seen in particular from FIG. 6, the ball pin 12 comprises a stem 17 and a spherical termination element 16. The ball pin 12 formed by the stem 17 and the spherical termination element 16 is made of a rigid material, such as a metal or a plastics material. In the fastened state of the distributor ring 9, the spherical termination element 16 is situated in the coupling 13, which forms a ball socket 19. The coupling 13 is elastic so that the spherical termination element 16 can be introduced into the coupling 13. The coupling is made of an elastomer, for example.

[0080] The maximum transverse extent, i.e. in the present case the diameter of the spherical termination element 16, is greater than the maximum transverse extent of the entry opening of the coupling 13. As the spherical termination element 16 is introduced into the coupling 13, the entry opening of the coupling 13 is thus enlarged. If the spherical termination element 16 bears against the ball socket 19 of the coupling 19, the entry opening of the coupling 13 reduces again on account of the elastic properties of the coupling 13, such that a protrusion of the coupling 13 engages in the transition region between the stem 17 and the spherical termination element 16 and holds the spherical termination element 16 in the coupling 13. In this way a detachable ball-type snap-in connection is produced between the distributor ring 9 and the main body 4.

[0081] At the chamber filter plate 3 the distributor ring 9 is fastened as attachment part to the main body 4 of the chamber filter plate 3 by means of a plurality of detachable ball-type snap-in connections, for which the ball pin 12 and the coupling 13 are provided.

[0082] A second example embodiment of the assembly according to the invention will be described with reference to FIGS. 7 to 12.

[0083] Parts of this second exemplary embodiment that are identical to corresponding parts of the first exemplary embodiment will be denoted to by like reference numerals. With regard to the detailed description of these parts, reference is made to the description of the first exemplary embodiment.

[0084] Similarly to the first exemplary embodiment, the chamber filter plate 3 of the second exemplary embodiment shown in FIG. 7 comprises a central infeed channel 5. A distributor ring 9 is fastened as attachment part to the chamber filter plate 3. The connection is made in the first exemplary embodiment via a detachable ball-type snap-in connection, however this is formed differently as compared to the first exemplary embodiment, as will be described hereinafter:

[0085] A ring groove 23 is formed in the main body 4 and runs concentrically around the in-feed channel 5. Since the infeed channel 5 is circular in cross-section perpendicularly to the normal of the chamber filter plate 3, a ring groove 23 in this cross-sectional plane is also circle ring-shaped. In other exemplary embodiments the ring groove 23, however, may also have a different form.

[0086] As can be seen in particular from FIG. 12, the ring groove 23 has an annular first entry opening, which leads to an annular first groove hollow body. In a cross-section in the circumferential direction of the ring groove 23, as is shown in FIG. 12, the ring groove 23 is dovetail-shaped. The maximum transverse extent of the first entry opening in a cross-section formed perpendicularly to the circumferential direction of the ring groove 23 is smaller than the maximum transverse extent of the first groove hollow body with this cross-section.

[0087] As shown in FIG. 8, the distributor ring 9 has an annular pin-like protrusion 24 on the side facing the chamber filter plate 3. Furthermore, the ball-type snap-in connection of the second exemplary embodiment comprises an adapter ring 22, which is made of an elastomer, in particular rubber. This adapter ring 22 is shown in FIGS. 9 and 10.

[0088] FIG. 10 shows a cross-section of the adapter ring 22 which is formed perpendicularly to its circumferential direction. The outer face 30 of the adapter ring 22 is trapezoidal or dovetail-shaped. This outer face 30 corresponds to the inner face of the ring groove 23. The adapter ring 22 may in this way be inserted into the ring groove 23 such that it sits form-fittingly in the ring groove 23. A further ring groove 27 is also formed in the adapter ring 22. This further ring groove 27, however, has a different form as compared to the ring groove 23 in the main body 4 of the chamber filter plate 3. It has an annular second entry opening 28. The second entry opening 28 is adjoined by an annular second groove hollow body 29. The maximum transverse extent A of the second entry opening 28 in the cross-section shown in FIG. 10 is smaller than the maximum transverse extent F of the second groove hollow body 29 with this cross-section.

[0089] As shown in particular in FIGS. 11 and 12 the annular pin-like protrusion 24 of the distributor ring 9, in a cross-section formed perpendicularly to the circumferential direction thereof, has an eyebolt 25 which is adjoined by a spherical annular termination element 26. The geometry of the annular pin-like protrusion 24 thus corresponds to the further ring groove 27 of the adapter ring 22. As shown in FIGS. 11 and 12, the adapter ring 22 may thus be inserted into the ring groove 23. The annular pin-like protrusion 24 of the distributor ring 9 may also be inserted into the further ring groove 27 of the adapter ring 22, such that a detachable ball-type snap-in connection is formed between the distributor ring 9 and the main body 4 of the chamber filter plate 3.

[0090] FIG. 11, similarly to FIG. 5, shows the connection of two distributor rings 9 and 9 to the main body 4 of a chamber filter plate 3 via the ball-type snap-in connection of the second exemplary embodiment, wherein FIG. 12 shows a detailed view of this ball-type snap-in connection.

[0091] A third exemplary embodiment of the assembly according to the invention will be described with reference to FIGS. 13 to 15.

[0092] In a filter plate 35, an abrasion protection means 33 is arranged in the outfeed for the filtrate. This abrasion protection means 33 is used to protect the outfeed opening or the walls of the discharge channel if, for further drying of a filter cake, compressed air is blown against the exit direction of the filtrate through the discharge channel.

[0093] The abrasion protection means 33 is formed as an insert in the filter face. As shown in FIG. 14 it therefore has nubs on the upper side for supporting a filter cloth. The underside of the abrasion protection means 33, facing away from the upper side, faces towards a discharge channel for the filtrate. As shown in FIG. 13, the filter plate 33 has filtrate bores 11 in the corners. From these filtrate bores 11, which are arranged in alignment in the case of adjacent filter plates 35, branch bores pass to the discharge channel As shown by way of example in FIG. 13 in the lower right-hand corner, the abrasion protection means 33 is arranged at the outlet opening of such a branch bore.

[0094] In order to fasten the abrasion protection means 33, two ball pins 12 are formed at the filter plate 34, as shown in FIG. 14, and, as shown in FIG. 15, two couplings 13 are formed at the abrasion protection means 33. The ball pins 12 and the couplings 13 provide a snap-in connection, via which the abrasion protection means 33 is connected to the filter plate 34 and can be held thereagainst by means of elastic forces. Alternatively, the abrasion protection means 33 could also be connected to the filter plate 34 by means of a ring groove 23 and an annular pin-like protrusion 24 in the exemplary embodiment shown in FIG. 7.

[0095] In other exemplary embodiments other attachment parts are fastened to the filter plate via at least one above-described detachable snap-in connection at a channel to the filter chamber 6. For example, the support ring 10 can be fastened to the main body 4 in this way. Furthermore, a protective cover for a filter cloth 7 can be fastened to one of the filter plates 2 and 3 via a detachable snap-in connection.

[0096] The attachment part may also be formed as a supporting cam, Similarly to the distributor ring 9, the supporting cam may protrude in the transverse direction. It is used to support a base of the filter plate 2 on a corresponding supporting cam of an opposite base of an adjacent filter plate 3 in a filter press. The supporting cam can be connected to the filter plate 2, 3 via at least one above-described detachable ball-type snap-in connection. An opening may also be formed in the supporting cam, such that said opening surrounds the opening of the infeed channel 5.

[0097] Furthermore, a membrane can be connected to the filter plate 2, for example in the region of the four corners, via the above-described detachable ball-type snap-in connections. The membrane is pre-fixed via these ball-type snap-in connections. The membrane is then ultimately held securely in place as the filter press in closed.

LIST OF REFERENCE NUMERALS

[0098] 1 filter plate pack [0099] 2 membrane filter plate [0100] 3 chamber filter plate [0101] 4 main body [0102] 5 infeed channel [0103] 6 filter chamber [0104] 7 filter cloth [0105] 8 filtration path [0106] 9, 9 distributor ring [0107] 10 support ring [0108] 11 filtrate bore [0109] 12 ball pin [0110] 13 coupling [0111] 14 first contact face [0112] 15 second contact face [0113] 16 spherical termination element [0114] 17 stem [0115] 18 ring seal [0116] 19 ball socket [0117] 20 opening [0118] 21 distribution channels [0119] 22 adapter ring [0120] 23 ring groove [0121] 24 annular pin-like protrusion [0122] 25 eyebolt [0123] 26 spherical annular termination element [0124] 27 further ring groove [0125] 28 second entry opening [0126] 29 second groove hollow body [0127] 30 outer face of the adapter ring [0128] 31 inner face of the adapter ring [0129] 32 filter chamber boundary surface [0130] 33 abrasion protection [0131] 34 discharge channel [0132] 35 filter plate