WO2020094282A1 - Cassette-type filter plate for horizontal filter - Google Patents

Abstract

The invention relates to a cassette-type filter plate for a plate filter, in particular for filtering slurry, having multiple filter chambers arranged next to one another in the longitudinal direction L, wherein the cassette-type filter plate has at least one raw fluid space and comprises in the bottom region webs extending transversely with respect to the longitudinal direction, between which webs there is at least one bottom opening that can be closed by means of a bottom element, wherein a downward-oriented sealing region is provided in the bottom region and encloses the at least one bottom opening, wherein part of the sealing region extends along the underside of the webs and the webs further have a lateral sealing region for sealing with respect to the filter plates that are adjacent when viewed in the longitudinal direction L.

Description

 Cassette-like filter plate for horizontal filters

The invention relates to a cassette-like filter plate for a plate filter, in particular for filtering mash in beer production, and a plate filter with a plurality of cassette-like filter plates according to claims 1 and 12.

Plate filters are used as mash filters in beer production to separate solid and liquid components from the mash for wort clarification and to wash out or leach out the spent grains.

The usual process steps for the operation of these plants are the filling of the previously saccharified mash into the filter chambers of the mash filter, the filtration of the mash so that a clarified, sugar-containing wort is separated from solids (spent grains) and the subsequent washing out and leaching out of the mash ingredients contained in the grains such as sugar parts by introducing water.

After the above-mentioned process steps, the spent spent grains must be removed from the filter chambers in order to enable a subsequent filtration cycle as quickly as possible.

Such mash filters are already well known and have standing filter chambers arranged side by side, which are laterally delimited by respective plates, between which, for example, a frame with at least one filter cloth is arranged. As is generally known, the individual chambers are pressed tightly against a fixed head plate by means of a stamp. The filter chambers are emptied by opening the horizontally clamped plate packs. Conventionally, the individual plates move apart one after the other so that the filter cake, i.e. the spent grains fall down into a spent bunker located below the filter and can be removed from there, for example, by a screw. Depending on the design of the filter, the chambers are sprayed out or the filter layer (especially the filter cloths) is spray-cleaned before the plates are pushed together again and is pressed firmly using a circumferential seal arranged between the plates or frame be sealed).

The known mash filters have the disadvantage that they require more space due to the type of emptying, ie by moving the individual plates apart. Moving the panels apart and pushing them together takes a relatively long time long, so that there is poor plant efficiency. In addition, the conventional emptying of the plate filters is accompanied by a not inconsiderable noise and steam emission.

In the conventional construction of the frames or plates, however, there are major problems with emptying the filter chambers downward through a bottom opening, since a simultaneous sealing of the filter plates in the horizontal or longitudinal direction to one another and the sealing towards the bottom bottom opening also entail sealing problems brings itself. As discussed below, there is either a portion where seals overlap, or there are unsatisfactorily sealed locations.

FIG. 20 shows a U-shaped filter plate which is open at the bottom and has a bottom opening 5. A corresponding plate is pressed with further frames or plates. The plate has a circumferential, lateral seal 7, as well as a sealing area 6 between the plate and the base element, whereby, as shown in the figure, there are critical weak points S of the seal, where there is neither a downward nor through to the adjacent plate Adequate sealing takes place and thus leaks result.

FIG. 21 shows a further embodiment with filter chamber plates with a lower opening 5 for filter cake discharge, which is surrounded by a sealing area 6 which faces the closing bottom element. This figure already shows a plurality of plates pressed via lateral sealing area 7, the sealing area 6 of the lower opening and closing mechanism running away via a plurality of horizontally pressed chambers. Here, too, there are considerable leakage problems or weak points due to the overlapping seals.

Appropriate leakage is not acceptable for hygienic, in particular food hygiene reasons, as well as safety aspects.

Proceeding from this, the present invention is based on the object of providing a filter plate and a plate filter which entail simple emptying and, at the same time, adequate tightness.

According to the invention, this object of the features of claims 1 and 12 is achieved.

According to the present invention, a cassette-like filter plate for plate filters, in particular for filtering mash, is therefore provided with a plurality of filter chambers arranged next to one another in the longitudinal direction L. A cassette is understood here to mean a housing which is open to at least one side and opened downwards to accommodate unfiltrate, wherein the at least one side opening is closed in the assembled state of the plate filter and the bottom opening can also be closed by at least one bottom element and can be opened for emptying.

A filter chamber comprises at least one non-filtrate space, one filtrate space and a filter element, for example in the form of a filter cloth. The cassette-like filter plate comprises at least one unfiltrate space. Advantageously, the filter plate can be emptied from below via a bottom opening in such a way that the filter plates no longer have to be moved apart in the longitudinal direction L for emptying. The bottom opening is located between webs that extend transversely to the longitudinal direction L and are provided in the bottom area of the filter plate. The webs according to the invention give the cassette-like filter plate stability and enable a closed area to be provided around the opening in the bottom area, where a closed sealing area directed downward towards the bottom element can be provided, with a part of the sealing area along the underside the webs extend. This allows the bottom opening to be sealed successfully, since the sealing area extends around the opening and does not have to run across several filter plates.

The term sealing area here means either a sealing element, for example a sealing rubber, a sealing cord, a flat gasket or the like, or the counter surface for the sealing element, which is then arranged accordingly on the base element. Furthermore, the two webs on the floor enable the cassette-like filter plate to perform the necessary functions of a filter chamber without additional plates, since functional elements (either filter elements or inflatable membranes or profiled surfaces) can be attached in the area of the webs or other functional plates can be securely attached can be attached to it.

In addition, the webs enable adequate sealing in the horizontal direction, i.e. the webs also have a lateral sealing region for sealing adjacent filter plates when viewed in the longitudinal direction L.

The webs thus serve on the one hand for sealing in the horizontal direction and also for sealing downward to a floor element which is intended to close the floor opening.

The cassette-like filter plate has at least one side opening, that is to say an opening which is directed towards adjacent filter plates, preferably two opposite side openings, the lateral sealing region then, which also runs along the web, encloses the respective side opening. For example, channels that are arranged in the filter plates in order to conduct medium from filter plate to filter plate lie within this sealing area. The cassette-like filter plate thus has at least one side frame which surrounds the side opening and which can be used to fasten functional elements in an advantageous manner.

According to a preferred embodiment, at least one functional element is mounted on the cassette-like filter plate, in particular at least one functional element from the following group:

Filter element, profiled surface for the filter element, which serves to discharge the filtrate and can also be designed as an inflatable profiled membrane (the filtrate, which flows from the non-filtrate space through the filter element to the filtrate space, can flow between the profile elevations to a filtrate outlet),

Membrane, especially inflatable or elastic membrane to press on the filter cake or to deform when moving in and thereby favor the falling off of a filter cake, uneven structure, in particular uneven surface, rods, grids, structured surface, which is arranged behind the inflatable membrane and which in is arranged in a membrane inflation space, so that when the membrane is in a non-inflated, preferably attracted position, the uneven surface or structure is pushed through the membrane, such that the membrane has an uneven surface with several elevations, so that the filter cake breaks, falls off and can be discharged in an optimized manner.

The cassette-like filter plate thus serves as a basic element and can be provided with suitable functional elements as required and for the application.

The functional elements can advantageously be securely and easily attached to the webs, which in turn saves additional plates and can lead to increased stability.

It is also possible that the cassette-like filter plate can be laterally connected to a functional plate which has a functional element (as previously defined) on at least one side. having. The cassette-like filter plate can thus be expanded in its functions as desired, whereby the manufacturer can produce a basic element in the form of the cassette-like filter plate and the functional plates can be adapted according to customer requirements and application, which leads to considerable savings in manufacturing costs and a simple one Adaptation to various processes enabled.

According to a preferred embodiment, the cassette-like filter plate has a central web or a vertical central wall, each of which likewise extends transversely to the longitudinal direction L and divides the bottom opening between the outside webs into two bottom openings.

The cassette-like filter chamber can thus be converted into a double element in a simple manner. The two bottom openings can then, for example, each be surrounded by their own circumferential sealing area or both openings can be enclosed by a common sealing area. Each opening can be closed by its own floor element or by a common one.

The unfiltrate space can also be subdivided accordingly, for example by means of the central web, whereby functional elements (which have been defined previously) can extend vertically upwards from the central web. For example, two membranes spaced apart in the longitudinal direction L can extend upwards in the vertical direction from the central web, which are preferably inflatable. Thus, an inflation space can be provided between the membranes, to which inflation medium is applied, so that the membranes can move to both sides. The unfiltrate space can also be divided by one or two Filterele elements, which extend from the central web upwards or by a membrane and a filter element, which extend vertically upward adjacent. A corresponding central web thus serves to further expand the functions of the cassette-like filter plate.

However, it is also possible for a vertical middle wall between the webs to subdivide the unfiltrate space into two unfiltrate spaces and for a functional element to be arranged on at least one side of the wall, for example a filter element being arranged on both sides in particular on a profiled surface . Here, therefore, one of the webs not only extends vertically upwards over a certain section (whereby a side opening delimited by a frame results), but the web extends vertically upwards to an upper region of the filter plate. It is also possible for a filter element to be arranged on one side of the vertical central wall, in particular on a profiled surface and for a membrane, in particular an inflatable membrane, to be provided on the opposite side of the central wall.

The cassette-like filter plate is advantageously designed in such a way that only one type of filter plate of the same type is required for the plate filter, in which case corresponding cassette-type filter plates can then be strung together in the longitudinal direction L and only have to be closed by a top and bottom plate if necessary. Corresponding results in considerable manufacturing savings, for example only one manufacturing mold is necessary in the case of a casting or injection mold. Consumable parts such as seals are also standardized, which simplifies storage and stocking, as well as the installation / removal that may be necessary. There is at least one unfill space inside the cassette-like filter plate, which is laterally delimited by a filter element and / or an in particular inflatable / retractable, at least partially elastic membrane. This means that only one cassette-like filter plate is sufficient per filter chamber, which comprises a non-filtrate chamber, at least one filter element and at least one filter chamber, and, as in the prior art, several different types of plates are not necessary.

A cassette-like filter plate is then advantageously constructed, for example, as follows: The cassette-like filter plate has, for example, a central web with two vertically extending filter elements or a vertical central wall with lateral filter elements, in particular on a respective profiled surface, and two side openings in the area thereof a membrane, in particular inflatable / retractable, at least partially elastic membrane is arranged. Such a cassette-like filter plate is particularly easy to manufacture and also has the advantage that a corresponding filter plate has two unfiltrate spaces and two filtrate spaces, as well as two floor openings that can be closed by one or two floor elements. Two such cassette-like filter plates can be connected to one another in such a way that an inflation space then results between the mutually facing membranes

Another possible embodiment is constructed, for example, in such a way that the cassette-like filter plate has a side opening on one side and a vertical side wall extends from the web on the other side. The vertical side wall is then part of the web. The vertical side wall preferably has a membrane, in particular an inflatable membrane, on its inward side and on its outer side. side a filter element, especially on a profiled surface. However, it is also possible for the side wall to have a membrane, in particular an inflatable membrane, on its outside and a filter element on its inward side, in particular on a profiled surface. Furthermore, an in particular inflatable membrane and in the area of the side opening a filter element, in particular on a profiled surface, can be arranged on the inward side or a filter element, in particular on a profiled surface, can be provided and a membrane, in particular an inflatable membrane, in the area of the side opening.

A cassette-like filter plate constructed in this way also enables identical filter plates of the same type to suffice for the plate filter.

Advantageously, the webs have on their inward-facing side, at least in the upper area, to the center and downwards, bevelled or rounded areas such that the filter cake can slide down well when the unfiltrate space is emptied.

The cassette-like filter plate is advantageously made of plastic. A corresponding cassette can simply be manufactured in a corresponding form by means of casting, in particular injection molding.

In order to ensure sufficient stability for the webs, the webs can have reinforcement, in particular metal reinforcement, which is applied to and / or into the webs, or the webs can be made of metal. It is also possible for the cassette-like filter plate to be made of metal, in particular stainless steel, which is advantageous in particular in the area of food production due to improved cleaning options and / or thermal expansion / tension. It is also possible for the cassette-like filter plate to be made of plastic in a mold, a more stable material being used in the area of the webs than in the rest of the area. In addition, different materials can be expediently connected to one another (e.g. braced, clamped, screwed, welded, cast, poured, glued, etc.).

The invention relates to a plate filter, in particular for filtering and / or saccharifying mash with a plurality of cassette-like fil terplatten arranged side by side in the longitudinal direction L according to at least one of the preceding claims. Corresponding Plattenfil ter can be easily manufactured and, in particular, can also be easily emptied and, moreover, have sufficient overall tightness and hygienic design. As already mentioned, it is particularly advantageous if a corresponding plate filter only has a cassette-like filter plate that is lined up in an identical manner. The filter plates of the same type are arranged next to each other in the longitudinal direction L, pressed and fastened accordingly. Thus, only a cassette-like filter plate enables all the necessary filter functions without the need for additional filter plates.

The present invention is explained in more detail below with reference to the following figures:

Figure 1 shows in perspective a cassette-like filter plate according to the present

 invention

FIG. 2 shows a longitudinal section through a cassette-like filter plate according to the present invention

FIG. 3a shows a longitudinal section through a cassette-like filter plate with two function plates

Figure 3b shows a plate filter with the lined-up filter plates shown in Figure 3a.

FIG. 4a shows a longitudinal section through a further embodiment of a cassette-like filter plate with a functional plate according to a further exemplary embodiment of the present invention

FIG. 4b shows the plates shown in FIG. 4a in the connected state

FIG. 5a shows a longitudinal section through a further embodiment of a cassette-like filter plate with a functional plate according to a further exemplary embodiment of the present invention

FIG. 5b shows the plates shown in FIG. 5a in the connected state

FIG. 6a shows a further longitudinal section through a cassette-like filter plate according to a further exemplary embodiment of the present invention

FIG. 6b shows the cassette-like filter plates shown in FIG. 6a in a lined-up state. FIG. 7a shows a further longitudinal section through a cassette-like filter plate according to a further exemplary embodiment of the present invention

FIG. 7b shows the cassette-like filter plates shown in FIG. 7a in a lined-up state

FIG. 8a shows a further longitudinal section through a cassette-like filter plate according to a further exemplary embodiment of the present invention

FIG. 8b shows the cassette-like filter plates shown in FIG. 8a in a lined-up state

9a and 9b show a cassette-like filter plate in perspective with two bottom openings

FIG. 10a shows a longitudinal section through a further embodiment of a cassette-like filter plate with a functional plate according to a further exemplary embodiment of the present invention

FIG. 10b shows the plates shown in FIG. 10a in the connected state

FIG. 11 a shows a longitudinal section through a further embodiment of a cassette-like filter plate with a functional plate according to a further exemplary embodiment of the present invention

Figure 1 1 b shows the plates shown in Figure 11 a in the connected state

FIG. 12 shows a longitudinal section through a further embodiment of a cassette-like filter plate with a functional plate

FIG. 13 shows a longitudinal section through a further embodiment of a cassette-like filter plate with a functional plate

FIG. 14 shows a longitudinal section through a further embodiment of a cassette-like filter plate with a functional plate

FIG. 15a shows a further longitudinal section through a cassette-like filter plate according to a further exemplary embodiment of the present invention FIG. 15b shows the cassette-like filter plates shown in FIG. 15a in a lined-up state

Figure 16a shows a preferred embodiment of a cassette-like filter plate according to a preferred embodiment with two bottom openings

FIG. 16b shows a perspective elevation of the cassette-like filter plate shown in FIGS. 16a and 16b

FIG. 17a shows a further embodiment of a cassette-like filter plate with bevelled webs

FIG. 17b shows an enlargement of area A in FIG. 17a

FIG. 18 shows a perspective illustration of a cassette-like filter plate with external liquid channels

FIG. 19 shows an embodiment according to the present invention in a perspective view with a functional element that can be inserted

Figure 20/21 show filter plates with bottom openings, but without a web.

Figure 1 shows a perspective view of a cassette-like filter plate 1 for a plate filter according to the present invention. A cassette is understood here to mean a housing which is open to at least one side and opened downwards to accommodate unfiltrate, the at least one side opening being closed in the assembled state of the plate filter and the bottom opening being closable by at least one base element and for emptying can be opened. The cassette-like filter plate 1 is frame-like and encloses an unfiltrate space 2 for receiving unfiltrate and filter cake. The cassette-like filter plate 1 further has lateral elements 19, 20 and an upper element 21. In this exemplary embodiment, the lateral elements 19, 20 are connected to one another by two webs 3a, 3b. Between the webs 3a, 3b there is a bottom opening 5 in the bottom area through which filter cakes can be brought out at the end of the filtration. This bottom opening 5 can be closed with a bottom element 4 (see for example FIG. 2) by means of a closing mechanism. In order to seal the opening 5 against the bottom element 4, a circumferential sealing area 6 is provided around the bottom opening, which seals the bottom area of the cassette-like filter plate 1 against the bottom. seals the element 4. In this case, the sealing element, for example a sealing rubber / sealing cord, can be provided on the bottom of the cassette-like filter plate 1 or else on the bottom element 4. Thus, only a cassette-like filter plate 1 is necessary for the unfiltrate space, so that there is a sealing area 6 for the bottom element 4 does not have to extend over several plates. The sealing area 6 can enclose the entire floor opening 5 by means of the webs 3a, 3b in the floor area. This ensures a secure seal to the floor element 4. A circumferential sealing area 7 is also provided on the sides of the filter plate elements 19, 20, for sealing adjacent filter plates, viewed in the longitudinal direction L, which are connected or pressed together to form the plate filter. This sealing area 7 also completely surrounds the front side opening 9a of the filter plate 1. On the rear side there is a corresponding sealing area 7 which, for example, surrounds the opposite side opening 9b. In this case, as shown in FIG. 2, the sealing area can be formed by a sealing element, such as sealing rubber, for example, or it can be formed only in the form of a sealing surface which interacts with a seal of an adjacent plate which surrounds the side opening 9b . Channels 22 can be located in the cassette-like filter plate, for example in the corner areas, through which media, for example unfiltrate, filtrate, water, washing-out media or pressing media, etc., are passed from filter plate to filter plate. 25 shows, for example, an unfiltrate inlet into the filter chamber 2. As shown in FIG. 18, corresponding lines 22 can also be arranged outside on the filter plate and corresponding media can also be fed into or out of the filter plate via corresponding inlet openings, for example 25.

The cassette-like filter plate 1 can be made from various materials and raw materials. Plastics, such as polypropylene (PP) and composites with a large proportion of PP or polyoxymethylene (POM), are particularly suitable, the composition of which can be adapted to the relevant requirements. The webs 3a, 3b can also be reinforced, in particular metal-reinforced.

Since the web depth (in the direction L) should be as small as possible, reinforcing elements such as metal struts or metal frames are particularly advantageous, since they increase the bending stiffness and reduce the risk of undesired deformation / damage. Such elements can, for example, be cast in plastic or connected in some other way (for example, braced, screwed, clamped, welded or glued). In the case of cassettes made of plastic, a screw connection made of steel at the inside of the webs has proven to be the best. It is therefore possible for the entire cassette, or only certain sections, to be made of steel or other metals, alloys, plastics and / or other materials.

The cassette-like filter plate 1 can also be made entirely of metal. The individual components of a plate can be welded to one another, for example, or a corresponding filter plate can be milled from a material or manufactured using 3D printing.

It is essential that a connection technique is selected such that the cassette-like filter plate 1 is sealed towards the outside, that is, downwards towards the bottom element 4 and towards the sides L.

FIG. 2 shows a longitudinal section according to an exemplary embodiment of a cassette-like filter plate 1. The sealing area 7 can be seen here, a round cord seal being provided here, for example. Likewise, the sealing area 6 is provided in the lower area, a round cord seal also being provided here, which seals the unfiltrate space 2 to the base element 4.

This basic element can now either be provided with certain installations or functional elements, or can be connected to further functional plates which have corresponding functional elements. Such functional elements can be, for example, as shown in FIGS. 3-17:

- Filter element 14 (filter cloth or filter fabric etc.)

- Profiled surface 30, on which the filter element 14 rests, in such a way that filtrate can flow off between the filter element and the depressions of the profiled surface, wherein the profiled surface 30 can also be manufactured as a profiled inflatable membrane in order to feed the filter cake Press or repel by the filter element 14.

- Membranes 13, in particular inflatable membrane, for pressing the filter cake and / or

an uneven surface or uneven structure (in particular in the form of rods, grids, a structured surface) on which the membrane 13 rests in a non-inflated, preferably sucked-in position, such that the uneven surface or structure is penetrated pushes the membrane in such a way that the membrane 13 has an uneven surface with several elevations.

However, the membrane itself can also have a surface that is not flat, but has elevations such that the filter cake as a whole can fall off the membrane better.

The functional elements can be directly connected to the cassette-like filter plate or clamped there, or the installation can be carried out, for example, on a separate frame, e.g. Surrounds the membrane or filter element and is then connected via the frame to the cassette-like filter plate, for example can also be inserted. Attachment to the webs 3a, 3b is particularly advantageous in order to give them sufficient stability.

FIGS. 3a to 5b show exemplary embodiments in which the cassette-like filter plate 1 is connected to functional plates 16.

Figure 3a shows, for example, a cassette-like filter plate 1 as described in Figures 1 and 2.

The cassette-like filter plate 1 has, for example, the necessary inlet openings for the corresponding media, an unfiltrate inlet 25 in the unfiltered space 2 being recognizable in FIG.

This cassette-like filter plate 1 has, for example, no functional element in FIG. 3a. The cassette-like filter plate 1 is combined here with two functional plates 16a and 16b, the functional plate 16a having a frame 26 which is covered with a respective membrane 13 at the front and rear, an inflation space 27 resulting between the membranes 13 into which an inflation medium can be let in and out via at least one opening 28 such that the membranes 13 can move outward in the direction of the unfiltrate space 2 and / or can excite into the inflation space 27 when the inflation medium is discharged. The second functional element 16b has a filter element 14 on both sides, which is arranged here on a profiled surface 30, the space between the filter element 14 and the underside of the depressions of the profiled surface 30 representing the filtrate space, for example via the opening 31 Filtrate can run off in a drain line. Such a filter plate can have, for example, two filtrate outlets 31, one at the top and one at the bottom. As shown in FIG. 3b, the functional plates 16 are designed such that they can be sealingly connected to the cassette-like filter plate 1 in the longitudinal direction L via the sealing region 7 and fastened together, for example screwed. The plate filter according to the invention then has plates 16a, 1, 16b, 1, 16a etc. which are lined up with one another, only the essential components of the plate filter being shown here and, for example, no head and end plates being drawn for the sake of simplicity.

Figure 4a shows a further exemplary embodiment which essentially corresponds to the previous exemplary embodiments, wherein there are not three different plate types here, but only two, i.e. that in addition to the cassette-like filter plate 1, only one further functional plate 16 is provided, which has a filter element 14 on one side and a membrane 13 on the other side, and which can be sealingly connected to the cassette-like filter plate 1 via the sealing region 7, so that the cassette-like filter plate 1 and the function plate 16 can be arranged alternately, as was also described above and is shown in FIG. 4b. Since only two different types are necessary here, the manufacturing costs can be reduced.

FIGS. 5a and 5b show a further possible embodiment of a plate filter in which the cassette-like filter plate 1 is also arranged alternately with only one functional plate 16. This embodiment corresponds essentially to the previous embodiment, with the functional plate 16 e.g. has a frame-like structure and is provided on both sides with a profiled surface 30, on which in turn a filter element 14 is arranged. In this case, the profiled surface 30 may be formed to be an extensible profiled, e.g. nubbed membrane is formed, which can also extend outward and / or inward when an inflation medium is introduced or discharged into an inflation space 27 via, for example, the connection 28.

In the exemplary embodiments of the present invention, which have at least one functional plate 16, the functional plates 16 protrude laterally into the interior of the cassette-like filter plate 1. Advantageously, the width b (viewed in the longitudinal direction L, see for example FIG. 3a) in an upper region of the functional plate 16a, which is connected to the filter plate 1 via the sealing region 7, is smaller than the width p in the upper region of the filter plate 1. In the central region of the functional plate 16, the width I is greater than the width b in the upper region. FIGS. 6a to 8b show a further embodiment according to the present invention, but here the previously described functional plate is firmly integrated in the cassette-like filter plate.

The cassette-like filter plate 1 has the side opening 9a on one side and a vertical side wall 17 on the opposite side, which is firmly connected to the web 3b and the upper element 21 or is formed in one piece. The vertical side wall 17 is then part of the web 3b. Here, a membrane 13 is clamped or in particular screwed in adjacent to the unfiltrate space 2 and can be inflated / drawn in, for example, via the opening 28 via an inflation medium. A filter element 14 is clamped on the other side of the side wall 17, which is designed as a profiled surface 30. The cassette-like filter plate 1 is manufactured in such a way that the rear side R can be fitted into the front side V and the identical filter plates can thus be connected to one another in a sealing manner via the sealing area 7.

A corresponding construction is particularly advantageous since only one type of filter plate has to be manufactured here, which considerably simplifies the manufacturing effort and lowers production costs. It is shown here only as an example (in FIGS. 6a, 6b, 7a, 7b) that the web 3a is reinforced via a steel part 40, for example a strip, which serves as reinforcement and is screwed on.

The exemplary embodiment shown in FIGS. 7a and 7b essentially corresponds to the exemplary embodiment shown in FIGS. 6a, 6b, but here the filter element 14 is directed inwards and the membrane 13 outwards.

FIGS. 8a and 8b also show an embodiment in which only one type of cassette-like filter plate 1 is necessary for the plate filter. A vertical side wall 17 is also provided here as part of the web 3b. A filter element 14 is provided on a profiled surface 30 on the side of the vertical side wall 17 facing the unfiltrate space 2.

An inflatable membrane 13 is clamped in the area of the opening 9a, for example screwed in here. Inflation medium can also be introduced / deflated here via an opening 28 such that the membrane 13 is inflatable / retractable, the individual cassette-like filter plates 1 also being joined together here and sealingly connected to one another via the sealing region 7. The inflatable space 27 is then between the adjacent filter plates 1, here for example between the vertical side wall 17 and the membrane 13.

In a particularly advantageous manner, it is provided that a cassette-like filter plate 1 is designed in such a way that it has two bottom openings, in such a way that the unfiltrate space 2 can be separated into two areas. FIGS. 9a and 9b show a possible embodiment in a perspective representation. Here, the cassette-like filter plate 1 has a central web 11, which can be provided, for example, between the webs 3a, 3b and which likewise connects the elements 19 and 20 to one another. The sealing area 6 can either run closed around one of the two openings 5a, 5b or enclose both openings. For this purpose, the connections are adapted accordingly and, as shown in FIG. 9a, two separate unfiltrate inlet openings 25a, 25b are therefore provided.

A closure element 4 or two or more closure elements 4 can be provided to close the openings 5a, 5b. To divide the unfiltrate space into two unfiltrate spaces, for example, as shown in FIGS. 10a and 10b, a functional element can be arranged on the central web 11, here two spaced membranes in FIG. 10a

13, between which there is an inflation space 27. The cassette-like filter plate 1 can be connected to a functional plate 16 and sealed via the sealing area 7, with the functional element 16, for example, having a filter element on both sides

14, for example on a profiled surface 30. The plates are shown in the assembled state in FIG. 10b.

FIGS. 1 a and 1 b essentially correspond to the exemplary embodiment shown in FIGS. 10 a and 10 b, with a vertical central wall 12 adjoining the central web 1 1, which divides the unfiltrate space into two unfiltrate spaces 2 a, 2 b. Here, the vertical middle wall has a profiled surface on each side, on which a filter element 14 is arranged.

The functional plate 16 here in turn has two opposing membranes which are inflatable and / or retractable. Figure 1 1 b shows the plates 16 and 1 in the assembled state.

FIGS. 12, 13 and 14 show further possible variations of the different functional elements in the cassette-like filter plate 1 and the functional plate 16. In the exemplary embodiment shown in FIG. 12, the vertical central wall 12 has a filter element 14 on one side and on the other side a membrane 13 and the functional plate 16 also a membrane 13 and a filter plate 14, although not shown, the plates 16 and 1 can be installed alternately in a filter.

In FIG. 13, the vertical middle wall 12 has a filter element 14 on both sides, but the functional plate 16 also has a filter element 14 on both sides, both filter elements being arranged on a profiled surface and the profiled surface in the functional plate 16 as an inflatable membrane trained, these elements can also be installed alternately.

In the exemplary embodiment shown in FIG. 14, the vertical central wall 12 is not located on the central web 11, but rather two profiled surfaces 30 spaced apart from one another in the form of membranes on the central web 11, which are correspondingly clamped with filter elements 14 located above them Functional plate 16 has, for example, filter elements on profiled surfaces 30 on both sides. These plates 1 and 16 can also be installed alternately in the plate filter.

As shown, for example, in FIG. 19, a vertical middle wall 12 can also be pushed into the box-like filter plate 1 via the bottom opening 5 and thus subdivide the unfiltrate space 2 and the bottom opening. The vertical middle wall then has the corresponding functional elements, for example in a frame.

FIGS. 15a and 15b show a particularly preferred exemplary embodiment in accordance with the present invention.

All in all, only one cassette-like filter plate 1 is necessary here, which is advantageously divided into 2 filtrate spaces 2a, 2b. The cassette-like filter plate 1 here again has a vertical middle wall 12, with a profiled surface 30 on both sides, and a filter element 14. A membrane 13 is arranged on both sides in the area of the openings 9a, 9b, which membrane Closes openings 9a, 9b. As can be seen in FIG. 15 b, these cassette-like filter plates 1 can be connected to one another horizontally in the longitudinal direction L via the sealing areas 7. An inflation space 27 then results between the adjacent membranes 13 between the filter plates 1 and can be acted upon with inflation medium, for example, via at least one opening 28 in order to compress filter material. Figure 16a shows this embodiment in perspective. FIG. 16 b schematically shows an elevation according to the exemplary embodiment shown in FIGS. 15 and 16, the filter elements 14 on the vertical central walls 12 being shown only in simplified form here. In addition, this figure also shows the floor elements 4 in the alternative open position. As can be seen from FIGS. 17a and 17b, the webs 3a, 3b, so that the filter cake can be better discharged through the bottom opening 5, can be rounded at least in the upper region or be chamfered.

In order to improve the discharge of the filter cake, it is advantageous to avoid “swamps” if the filter element extends as far down as possible, in particular up to the webs 3a, 3b. However, the base element 4 can also be designed such that it projects into the filter plate 1.

The cassette-like filter plate 1 is in particular manufactured such that, for example, a filter element 14 or an inflatable membrane 13 extends to the inner edge K (see FIG. 17a) of the webs 3a, 3b or is only a distance of less than 10 centimeters from this edge, wherein the upper inner edge K is the edge from which a side wall extends downwards.

According to the present invention, the individual cassette-like filter plates 1 can now optionally be joined and connected horizontally in the direction L together with functional plates 16, in particular screwed together, and connected to closing end plates at the front and rear. The individual filter chambers can then be emptied without the plates having to be moved apart by the closure elements 4 being opened individually or collectively via at least one opening mechanism. In the filtration, unfiltrate can in each case be fed into a non-filtrate space 2 via a feed line, filtered through the filter element 14 and then passes through a filtrate space, in the exemplary embodiments for example between the filter element 14 and the profiled surface 30 to a filtrate outlet 31 and can from there are discharged via a drain line. A pressure medium can be introduced and / or discharged into an inflation space 27 via the openings 28 in such a way that an adjacent membrane 13 bulges into the unfiltrate space and, for example, compresses the filter cake or is drawn into the inflation space, optionally via a structure is, so that a filter cake break and or the centrifuging of filter cake residues is promoted. Corresponding feed lines can also be used to guide wash water for washing out the filter cake into the unfiltrate space and to discharge it again.

A removal element, not shown, can support the discharge of the filter cake. Wash water for cleaning the filter chambers can be supplied via wash water pipes. For maintenance purposes, the filter plates 1, or 1 and 16 can preferably be moved apart in the longitudinal direction L, for example pushed apart on a guide.

In the figures, the profiled surface 30 on which a filter element 14 rests is shown by rising transverse strips lying one above the other. The profiled surface can advantageously also be formed from adjacent elevations which run from bottom to top, which favors the process. E.g. this structure can also be found in the vertical middle wall, e.g. 15a, b or 11 to 14 is shown.

Claims

Expectations 1 . Cassette-like filter plate (1) for a plate filter (10), in particular for filtering mash in beer production, with a plurality of filter chambers arranged next to one another in the longitudinal direction L, the cassette-like filter plate (1) having at least one unfiltrate space (2) and in the bottom area comprises webs (3a, 3b) extending transversely to the longitudinal direction L, between which there is at least one bottom opening (5) which can be closed by at least one bottom element (4), a downwardly directed sealing area (6) being provided on the bottom area, which encloses the at least one bottom opening (5), part of the sealing area (6) extending along the underside of the webs (3a, 3b) and the webs (3a, 3b) further comprising a lateral sealing area (7) Sealing adjacent filter plates (1), (16) viewed in the longitudinal direction L. 2. Cassette-like filter plate (1) according to claim 1, characterized in that the cassette-like filter plate (1) has at least one side opening (9a, 9b), preferably two opposite side openings (9a, 9b), the lateral sealing region ( 7) encloses the respective side opening (9a, 9b). 3. Cassette-like filter plate (1) according to claim 1 or 2, characterized in that at least one functional element (14, 13, 31) is mounted on the cassette-like filter plate (1), in particular at least one functional element from the following group: - filter element (14), - profiled surface (30), in particular inflatable profiled membrane (30a), for the filter element (14) for filtrate drainage, - membrane (13), in particular inflatable membrane (13), - Uneven structure, in particular uneven surface, rods, grids, structured surface, which is arranged behind the inflatable membrane (13). 4. Cassette-like filter plate (1) according to at least one of the preceding claims, characterized in that the cassette-like filter plate (1) can be connected laterally to a functional plate (16) which has a functional element (14, 13, 30) on at least one side. has, in particular at least one functional element from the following group: - filter element (14), - profiled surface (30), in particular inflatable profiled membrane (31 a), for the filter element (14) for filtrate drainage, - membrane (13), in particular inflatable membrane (13), - Uneven structure, in particular uneven surface, rods, grids, structured surface, which is arranged behind the inflatable membrane (13). 5. Cassette-like filter plate (1) according to at least one of the preceding claims, characterized in that the cassette-like filter plate (1) has a central web (11) or a vertical central wall (12) which each extend transversely to the longitudinal direction L and the bottom opening ( 5) Divide two floor openings (5a, 5b) between the webs (3a, 3b). 6. Cassette-like filter plate (1) according to claim 5, characterized in that at least one functional element (13, 14, 31) extends either from the central web (11) upwards to subdivide the unfiltrate space (2), in particular either - One or two, in the longitudinal direction L spaced, in the vertical direction extending membrane (s) (13), which are preferably inflatable or - One or two filter elements (14), preferably on a profiled surface (30), which can be designed as an inflatable membrane or - A membrane (13) and a spaced filter element (14). 7. Cassette-like filter plate according to at least one of claims 1 to 6, characterized in that the vertical central wall (12) divides the unfiltrate space (2) into two unfiltrate spaces (2a, 2b) and on the vertical central wall (12) on at least one side of the wall a functional element is arranged, preferably either a filter element (14a, 14b) on both sides, in particular on a profiled surface (30) or on one side a filter element (14), in particular on a profiled surface (30), and on a membrane (13), in particular an inflatable membrane, is arranged on the other opposite side. 8. Cassette-like filter plate (1) according to at least one of the preceding claims, characterized in that the filter plate (1) has a central web (1 1) with two vertically extending filter elements (14a, 14b) or a vertical central wall (12) with lateral filter elements (14a, 14b), in particular on a respective profiled surface, and has two side openings (9a, 9b), in each area of which an in particular inflatable membrane (13) is arranged, wherein in particular two cassette-like filter plates (1) can be connected to one another in the longitudinal direction L. are that there is an inflation space (27) between the mutually facing membranes (13). 9. Cassette-like filter plate (1) according to at least one of the preceding claims, characterized in that the filter plate (1) has a side opening (9a) on one side and a vertical side wall (17) on the other side from the web (3b). extends, which preferably has a membrane (13), in particular an inflatable membrane, on its inward side and a filter element (14) on its outside, in particular on a profiled surface or a membrane (13), in particular an inflatable, on its outward side Has a membrane and on its inward side a filter element (14), in particular on a profiled surface (30) or on the inward side a particularly inflatable membrane (13) and in the area of the side opening a filter element (14), in particular on a profiled surface (30) or on the inward side a filter element (14), in in particular on a profiled surface (30) and in the area of the side opening (9a) has a membrane, in particular an inflatable membrane. 10. Cassette-like filter plate according to at least one of claims 1 to 9, characterized in that the webs (3a, 3b) are chamfered or rounded downwards at least in the upper region toward the center on their inward-facing side. 1 1. Cassette-like filter plate according to at least one of claims 1 to 10, characterized in that the cassette-like filter plate (1) is made of plastic and the webs have a reinforcement, in particular metal reinforcement or are made of metal or that the cassette-like filter plate (1) is made of metal, especially stainless steel. 12. Plate filter, in particular for filtering mash in beer production, with a plurality of cassette-like filter plates (1) arranged in the longitudinal direction L, in particular according to at least one of claims 1 to 11. 13. Plate filter according to claim 12, characterized in that cassette-like filter plates (1) of the same type are arranged side by side in the longitudinal direction L, in particular the same mold can be used to produce all filter plates. 14. Plate filter according to claim 12, characterized in that cassette-like filter plates (1) and functional plates (16) are arranged alternately and are sealingly connected to one another via a lateral sealing area, the functional plates (16) having a filter element on at least one side (14), in particular with a profile surface behind it and / or an in particular inflatable membrane (13). 15. Plate filter according to at least one of claims 12 -14, characterized in that the at least one non-filtrate space (2) is located within the cassette-like filter plate (1) and is laterally delimited by a filter element (14) and / or a membrane (13) . 16. Cassette-like filter plate, in particular according to at least one of claims 1 to 1 1, characterized in that the at least one unfiltrate space (2) is located within the cassette-like filter plate (1) and by a filter element (14) and / or a membrane - ran (13) is limited laterally.