JPS6411325B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to pressure filters.

Pressure filters are known that have a support assembly for supporting a filter device, the support assembly comprising a duct for receiving liquid that has passed through the filter device, and further comprising a region between the support assembly and the filter device. It has an opening that communicates with the duct.

Two examples of pressure filters are plate filter presses and tube pressure filters. Two types of plate filter presses are commonly used: plate frame presses and recessed plate presses. In recessed plate presses, each filter plate unit has a recess defined by a raised periphery on both sides of the filter plate, the raised periphery being elevated above the drainage surface of the filter plate. Therefore, the maximum thickness of the filter cake formed in such a plate filter press is twice the depth of the recess. A recessed plate filter press is disclosed in British Patent No. 1389003.
In a plate-and-frame press, adjacent filter plates are separated by a frame to create a cavity within which a filter cake is formed.

A more recent development is the thin film filter press in which an overchamber is formed on at least one side by a flexible thin film.
During this period, pressure fluid is introduced between the membrane and the adjacent filter plate to exert a squeezing action on the filter cake to force further liquid out.

In plate filter presses, the fabric is located on the upper surface of each plate (ie, within the recess or frame). The oversurface often has grooves, otherwise the liquid can be directed behind the cloth to one or two of the filter plates.
It includes a formation that allows flow to more than one outlet. Such filter presses have various drawbacks. Providing the necessary formations on the filter plate to avoid damage to the fabric is often difficult and expensive. Additionally, some of the liquid must travel a long distance after passing through the fabric before reaching the exit opening. The same applies to compressed air supplied through the outlet opening (or other openings) to assist in evacuation of the filter cake.

Tubular pressure filters are disclosed, for example, in British Patent Specifications Nos. 907485, 1240465 and 1582957, and European Patent Specification No. 36318. The inner assembly of a tubular pressure filter generally includes a central cylindrical portion and two end pieces of larger diameter that close the ends of the outer tubular assembly and It forms a seal with it. The central cylindrical part serves as a support for the filter element. The filter element typically consists of a cylindrical sleeve of cloth placed over a concentric cylindrical sleeve of relatively coarse woven material, such as wire mesh;
The latter cylindrical sleeve supports the former fabric and creates a groove through which fluid can flow between the outer wall of the cylindrical portion of the inner assembly and the fabric sleeve. Conventionally, the cylindrical portion of the inner assembly has a number of holes for directing the liquid that has passed through the permeating medium through the wall of the inner assembly to the outside of the tubular pressure filter to collect the liquid. leads to the device. These holes also serve to direct pressurized air or other pressurized gases from the internal assembly to the underside of the permediate to assist in separating the filter cake adhering to the permediate and thus assist in draining the cake.

It has been found that the above-described devices for directing liquid away from the region between the lower surface of the medium and the outer wall of the internal assembly and for directing compressed air towards this region have various drawbacks. did. Drilling a large number of holes in the cylindrical portion of the inner assembly inevitably weakens the inner assembly to some extent, thus limiting the number of holes that can be provided per unit area of the cylindrical portion. As a result, some of the liquid travels a considerable distance (up to about 100 cm) parallel to the surface of the cylindrical part from the point where it passes through the medium to the nearest hole.
have to move. The same applies to the compressed air introduced behind the filter medium to discharge the filter cake. Also, the diameter of the holes must be relatively large (typically on the order of 5 mm) to provide adequate passage of liquid and compressed air. Therefore, under the high pressures (typically 700 to 2000 pounds per square inch or 5 to 14 megapascals) that are common inside tubular pressure filters, the wire mesh sleeve tends to protrude into the holes, thus damaging the wire mesh. It has been found that there is a risk of damage to the overlying cloth sleeve and even damage to the impermeable elastic sleeve. If corrosion of the internal assembly occurs, the hole diameter will tend to increase due to corrosion.
This problem gets worse.

Another disadvantage of internal assemblies of the type described above is that
This assembly is generally in the form of a hollow tube with a relatively large internal volume, which is filled with compressed air when it is necessary to supply air pressure to the underside of the filter medium for discharging the filter cake. This has the disadvantage of increasing the cost of the compressor and other accessories necessary to supply the compressed air. This problem increases as the diameter of the internal assembly and hence its internal volume increases. British Patent Specification No. 1582957 is
One device is disclosed to alleviate this problem. The inner assembly includes two common axis cylinders, the interior of the inner cylinder being isolated from the space between the two cylinders. This reduces the effective volume available inside the internal assembly. Although effective, this device requires additional welding during assembly of the internal assembly, thus increasing manufacturing costs.

According to the present invention, a support assembly includes a support member having a facing having an outer surface for supporting a filter device, the facing defining a duct and an opening, the duct forming an opening in the facing. It is disposed inside the outer surface so as to carry the liquid approximately parallel to the outer surface.

The pressure filter has an inner assembly forming a support assembly, a generally tubular outer assembly surrounding the inner assembly, and an inner compartment defined by an impervious membrane disposed inside the outer assembly. An annular chamber is formed between the inner and outer assemblies, the annular chamber being divided into a and an outer compartment, further comprising a filter device disposed within the inner compartment adjacent the outer surface of the inner assembly. a filter element comprising: a device for supplying a mixture of liquid and solid particles to the inner compartment; and a pressurized fluid to the outer compartment for depositing the solid particles on the filter element and forcing the liquid in the inner compartment out of the filter element. and a device for supplying liquid, and the liquid flowing into the duct through the opening is guided in the longitudinal direction of the internal assembly.

One embodiment of a tubular pressure filter according to the present invention has an internal assembly that provides good support for the supermedia and directs the fluid between the outer wall of the internal assembly and the supermedia. It is possible to provide suitable passageways leading to and from the region and to reduce the volume that must be filled with compressed air for the purpose of evacuating filter cake adhering to the overmedia.

The volume occupied by the ducts and openings is preferably in the range of 1/10 to 1/100, more preferably in the range of 1/30 to 1/60 of the total volume of the internal assembly.

In a preferred construction, the duct extends longitudinally of the internal assembly. At one end of the inner assembly is a collection chamber for liquid from which liquid can be directed outside the tubular pressure filter. Similarly, there is a distribution chamber at one end of the internal assembly to which compressed air can be supplied en route to the duct. These chambers may be at opposite ends of the internal assembly and the duct may extend between them.
Preferably, the duct is one of several ducts distributed around the internal assembly, and if collection and distribution chambers are provided, all ducts open into these chambers.

Advantageously, the internal assembly comprises a tubular member, for example a length of steel tube, with an end piece of larger diameter. However, as a variant, the tubular member may be a solid member, made of metal,
It can be manufactured from cementitious materials such as wood, plastic, ceramic or concrete.

The end pieces are preferably of the type described in GB 1573607, at least one of the end pieces comprising a substantially annular passage;
The annular passage is angled outwardly from the central axis of the inner assembly and toward a transverse midplane of the inner assembly. This annular passage serves to introduce the mixture to be pressurized into the inner compartment and communicates with the antechamber into which the mixture is introduced through the supply conduit. The feed conduit is equipped with a check valve or power supply to close the feed conduit hole when the inner compartment contains the high pressure mixture to prevent backflow through the feed conduit and also to prevent flow of the feed mixture during cake discharge. It has or cooperates with an actuated valve.

Preferably, each end piece includes a fairing that gradually changes the diameter of the end piece from larger diameter sections at opposite ends of the inner assembly to a smaller diameter central cylindrical section. providing an annular groove in the outward facing surface of each shaping part to enable the ends of the fabric sleeve to be secured to the outward facing surface of the shaping part in the manner described in GB 1598425; It's good. Preferably, the inner or smaller diameter end of each end piece is provided with an annular groove adjacent the central cylindrical surface.

In a preferred construction, the tubular inner assembly comprises a tubular support member or core having a facing on its outer surface, which facing is conveniently assembled from a plurality of facing elements or laths. It is.

Various materials can be used to form the lath. These materials include, for example, metals such as aluminum or stainless steel, suitable hardwoods,
or most preferably a suitable plastic material. Particularly suitable materials are of the type made by impregnating a layer of textile material with a thermoset resin.

Conveniently, the lath is fixed to the outer surface of the inner assembly by adhesive. Adhesives of the epoxy resin type have been found to be particularly suitable. The first lath is precisely aligned parallel to the longitudinal axis of the inner assembly and secured with screws for added stability. next,
Install the remaining laths one by one using the laths already in place as guides.

In a preferred embodiment, the shape of the laths is shaped such that each duct and opening is formed between each adjacent pair of laths. Each opening may consist of a slot that may extend substantially the entire length of the respective duct.

Each of the laths constituting the facing of the central cylindrical portion is provided with an insert portion which cooperates with the annular groove of the end piece to position the end piece with respect to the lath. preferable. In order to provide an annular chamber for the collection or distribution of liquid or compressed air or other gas, the annular groove can be made deeper than the length of the spigot.

Advantageously, the interior of each end piece is machined after being placed on the central cylindrical portion so that the inner end of each shaping portion is flush with the outer surface of the facing of the lath. This ensures that there are no sharp steps where the lath meets the shaping, thus preventing the possibility of damaging the fabric sleeve or impermeable elastic during use of the tubular pressure filter.

Preferably, the outer surface of the lath is shaped to form a surfacing with a grooved or corrugated appearance according to the method described in GB 1386246. The inner surface of each lath preferably includes a cutout that creates a free space into which excess adhesive can flow and that also allows the lath to fit into the cylindrical surface of the core of the inner assembly. It can be fitted snugly.

In other embodiments, the facing includes a single cylindrical sleeve or a body consisting of two or more partially cylindrical segments.

Other advantages of internal assemblies constructed in accordance with the present invention include that the core material of the central cylindrical portion is substantially protected from corrosion and that the corrugated or grooved appearance is created by milling. The inner assembly can be provided with a corrugated or grooved outer surface without weakening the cylindrical central portion as would be the case.

As a variant, the pressure filter may be a plate-type filter press consisting of a plurality of filter plate units, each of the filter plate units comprising a filter plate, the filter plates forming a support assembly, and It has filter elements on both sides that constitute the filter medium.

The facing can be assembled from a plurality of facing elements, for example made of lath. In such constructions, ducts and/or openings are constructed between adjacent facing elements. The opening may be a slot.

When the facing material is composed of laths, the laths are preferably elongated and extend vertically. Thus, there are multiple ducts and openings constructed between adjacent laths. During use, liquid that reaches the duct falls under its own weight to the bottom of the duct. If the filter plate is square, the laths are formed so as to connect the lower ends of the ducts to each other and create a bottom groove communicating with the outlet opening for draining the liquid to the outside of the filter plate unit. . If the filter plate is circular, the lath is formed so as to create a continuous circumferential groove that extends around the outer circumference of the facing and also communicates with an outlet opening for draining the liquid to the outside. The liquid outlet opening is normally located at the lower end of the filter plate, but may be provided at the top of the filter plate to receive compressed air or other gas for discharging the liquid or for discharging the filter cake after the filter is employed in a press. It is also possible to provide an opening. If the filter plate is square, the upper ends of the laths can be formed so as to provide a top groove interconnecting the upper ends of the ducts and communicating with the upper opening.

Instead of constituting the facing material from vertical elongated laths, the facing material can be constructed as a circular plate, for example from sector-shaped elements or from strips of material placed on the surface of the filter plate in the form of a spiral. In order to increase the density of the ducts towards the outside of the facing, this spiral can be a spiral with multiple origins.

For a better understanding of the invention and to illustrate how it may be practiced, reference will now be made to the accompanying drawings by way of example.

The tubular pressure filter shown in FIG. 1 includes an inner assembly 2 and a generally tubular outer assembly 4. The tubular pressure filter shown in FIG. The inner assembly 2 comprises a core or support member 6 in the form of a tubular member, to which two end pieces 8 and 10 are riveted. In the position shown in FIG. 1, end pieces 8 and 10 are in sealing engagement with outer assembly 4 to define an annular chamber 12 between inner assembly 2 and outer assembly 4. In the position shown in FIG. The annular chamber 12 is divided into two compartments 14 and 16 by a flexible impermeable membrane 18 secured within the outer assembly 4. Internal assembly 2
On the outer surface of the filter element or filter device 2
0 is set.

A fluid operated ram 22 is mounted on a spider 24 secured to the outer assembly 4. The piston rod of the ram 22 is connected to the tubular member or core 6 by a crossbar 26.

During operation of the tubular pressure filter of FIG. 1, a mixture of liquid and solid particles is pumped into the inner compartment 16 through the supply conduit 28. Inner compartment 1
6 is filled, a shut-off valve shuts off the supply of the mixture and a fluid, such as water, is supplied under high pressure to the outer compartment 14 through the inlet manifold 30. The pressure of the water acting on the impermeable membrane 18 forces the liquid component in the mixture past the filter element 20, which eventually flows to the liquid outlet conduit 32, as described below. During this operation, the solid components of the mixture are deposited on the filter element 20 in the form of a filter cake.

At the end of the pressurization operation, water is drawn by vacuum action from the outer compartment 14 through the manifold 30 and the ram 2
2 is actuated to lower the inner assembly 2 relative to the outer assembly 4 so that the inner compartment 16 communicates with the outside. Compressed air is then supplied through inlet conduit 34. This compressed air passes into the area directly below the filter element 20 and releases the filter cake so that it falls out of the tubular pressure filter. Internal assembly 2 is then returned by ram 22 to the position shown in FIG. 1 and the next cycle begins.

Referring to FIGS. 2 and 3, the internal assembly of a tubular pressure filter is shown.
The internal assembly comprises a tubular member 6 consisting of a length of steel tubing, an upper end piece 8 and a lower end piece 10. The upper end piece 8 comprises an annular front chamber 36 into which the mixture to be pressurized is introduced, and a narrow tubular passage 38 which slopes outwardly and downwardly towards the transverse mid-plane of the inner assembly. The mixture flows under pressure through the tubular passage 38 into the inner compartment 16 of the tubular pressure filter.

A surfacing consisting of a plurality of surfacing elements or laths 40 is assembled around the tubular member 6;
This lath 40 extends parallel to the longitudinal axis of the assembly over substantially the entire length of the tubular member 6 between the upper end piece 8 and the lower end piece 10. Each lath 40 has side edges shaped such that a pair of adjacent laths defines a longitudinal duct 42 and an outwardly opening narrow slot (FIGS. 4 and 5) therebetween. The average width of slot 44 is approximately 0.5 mm at its outer end. The shape of the outer surface of the lath is such that the assembled facing has a grooved surface as described in GB 1386246. The inner surface of the lath is provided with cut grooves 46 which allow the lath to adhere tightly to the cylindrical surface of the tubular member 6 and which also provide free space to accommodate excess adhesive. There is.

Other shapes for lath 40 are shown in FIGS. 6 and 7. It will be appreciated that the lath shown in FIGS. 6 and 7 is twice as wide as the lath 40 of FIG.
The laths shown in FIG. 6 meet each other at the troughs of the grooved outer surface of the facing, whereas the laths shown in FIG. 7 meet each other at the tips of the grooved outer surface. Each of the laths shown in FIGS. 6 and 7 has a curved surface 70 that coincides with the outer surface of the tubular member 6 and two sloped portions 7.
and an outer surface made of 2. The edge of the lath consists of two straight sections 74 and 75, one on each side of the curved recess 76. When the straight portions 74 of adjacent laths abut each other in position, the recesses 76 form the longitudinal ducts 42. However, the straight portions 75 do not abut each other and thus form an opening or slot 44.

The facing is assembled by first arranging a lath exactly parallel to the longitudinal axis of the inner assembly and so that the ends of the lath are equidistant from the ends of the tubular member 6.

This first lath is conveniently secured in place using screws and adhesive. Next, place the second lath on the side of the first lath and fix it with adhesive.
This process is repeated with successive laths until a complete facing is constructed. Las is the trademark name “TUFNOL”
It is made of fiber-reinforced thermosetting resin known as

The upper end piece 8 is provided with a deep annular groove 46 at its inner end. The inner part 48 of this annular groove 46 serves as a tubular distribution chamber into which compressed air is introduced through the conduit 34 for the purpose of discharging the filter cake. The outer portion of the annular groove 46 receives and positions a bayonet portion 50 at each end of each lath.

The lower end piece 10 is provided with a similar deep groove 52;
The inner portion of 2 serves as an annular chamber 56 for collecting liquid drained from the inner assembly through conduit 32. The outer part of the groove 52 is the insertion part 5 of the lath.
0 is accepted. Once the lath surface material is completed,
The upper and lower end pieces are slipped into the central cylindrical section and the smaller diameter ends of the end pieces are machined at 58 so that the shaping is flush with the outer surface of the facing.

Holes 60 are provided in the outer end of each end piece and in the tubular member to allow the upper and lower end pieces to be secured in place by a nut and bolt combination, rivets, or the like.

The central portion of the inner assembly is covered by a filter element 20 comprising a woven cloth sleeve tightly fitted into a coaxial felt-backed cloth sleeve, the felt-backed cloth sleeve being a lath. Fits snugly into the surface material. If further improvement in liquid drainage is required, a cylindrical sleeve of wire or plastic mesh material may be inserted between the felt-backed fabric sleeve and the lath facing. The filter element is fixed at both ends by lacing according to the method described in British Patent Specification No. 1598425; for this purpose:
An annular groove 62 is provided in the shaping portion or each end piece.

Although this embodiment of the invention has been described with respect to one particular form of tubular pressure filter, features of the invention are applicable to other types of tubular pressure filters such as those described in European Patent Specification No. 36318. It will be appreciated that it can also be applied to filters. Features of the invention are also applicable to tubular pressure filters in which the filter element is arranged on the inner surface of the outer assembly, in which case a mixture of liquid and solid particles is supplied to the outer compartment, while Pressure fluid is supplied to the inner compartment.

In the embodiments of FIGS. 8-14, the filter element, which is usually cloth, and the backing element supporting the filter element have been omitted for clarity.

8 to 10 show square filter plate units. This filter plate unit includes a filter plate 102 with a recess, and the filter plate 10
2 has a raised outer circumference 106 and an inner hub 108 on each side.
It has an annular recess 104 configured between. A groove 110 is provided on each side of the hub 108.

The base of the annular recess includes a facing 112 comprised of a plurality of elongated strips or laths 114. The laths 114 are vertically disposed and extend for the most part from the top to the bottom of the recess 104. However, the lath adjacent the hub 108 is in two parts to accommodate the hub 108, and the hub 108 is not an integral part of the filter plate 102, but is fitted after positioning the lath.

As shown in FIGS. 9 and 12, each pair of adjacent laths 114 define a duct 116 and a slotted hole 118 therebetween. In FIG. 9, the outer surface of the lath is depicted as forming a flat surface, whereas in FIG. 12, the lath is shaped to provide a fluted surface.

As shown in FIGS. 10 and 11, the upper and lower ends of each lath are provided with a notch 120. These cutouts 120 form a top groove 122 and a bottom groove 124 (the eighth
), and these grooves 122 and 124 are formed respectively.
are in communication with openings 126 and 128, respectively, in the filter plate.

Although not shown, in addition to the top groove 122 and the bottom groove 124, it may be desirable to provide one or more intermediate grooves as shown in Figure 14 of British Patent Specification No. 1413757. I don't know.

A plate-type filter press consists of a plurality of filter plate units as described above with reference to FIGS. 8-11. For example, a filter press consists of 100 plates. The plates are placed in face-to-face engagement, contacting each other at the periphery 106 and hub 108, and are held together under pressure. The cloth is lath 1
On the surface formed by 14, a backing fabric is positioned between the fabric and the lath as much as possible.
The slurry to be pressurized is fed through the central passage made by the connecting openings 130 of the hub 108, and this slurry passes through the grooves 110 into the cavities formed between adjacent filter plate units. Inflow. From this cavity, the liquid component of the slurry flows through the fabric, leaving the solid component deposited on the fabric in the form of a filter cake. As the liquid passes through the fabric, it moves along the surface of facing 112 until it reaches one of the slots 118. The liquid then flows through the slots 118 into the respective ducts 116 and falls through the ducts 116 under its own weight to the bottom groove 124. The liquid flows along bottom groove 124 and exits through opening 128 . The flow rate of the liquid can be large enough to cause a portion of it to flow upwardly along the duct 116 to the top groove 122, in which case this portion of the liquid is drained through the opening 126.

When the pressure build-up has progressed for a sufficient period of time to optimally form a filter cake within the cavity, the slurry supply is interrupted and the plates are separated from each other.
Compressed air may be supplied through the opening 126 to facilitate removal of the filter cake from the fabric. This compressed air flows into duct 116 and creates a jet of air through slot 118,
Blow the filter cake off the cloth.

The alternative configuration shown in FIGS. 13 and 14 corresponds in many respects to the configuration of FIGS. 8-11, so that corresponding parts have been designated with like reference numerals. 13 and 14 show a filter plate unit with a circular recess, which filter plate unit has the following features:
Filter plate 1 with outer ring 132 bolted
02 and two hub elements 134 providing a central hole 130 in the hub 108. Figures 8 to 11
As in the embodiment shown, the annular recess 104
are provided on both sides of the filter plate unit. At the bottom of each recess 104, a lath 11 is vertically disposed.
There is a surface material 112 made of 4. These last 1
The cross-sectional shape of 14 can be equal to that of FIG. 11 or 12, and includes a duct 116 and a slot 118.

In the lath 114 of FIGS. 13 and 14, a continuous groove 136 is formed extending around the outer periphery of the surface material 112 and communicating with the top opening 138 and the bottom opening 140.

In use, the filter plate unit of FIGS. 13 and 14 functions in much the same manner as that of FIGS. flows into the continuous groove 136 and exits from the bottom opening 140,
It probably also flows out from the top opening. As aforementioned,
Compressed air is supplied through the top opening 138 to facilitate evacuation of the filter cake.

Although this embodiment of the invention has been described with particular reference to a recessed plate filter press, it will be appreciated that it may also be applied to plate and frame presses. It will also be appreciated that features of the invention may be applied to thin film filter presses. In particular, the surfacing material according to the invention can be applied to flexible thin films, provided that it is made from a sufficiently flexible material. For example, the facing can be made from plastic material. If the flexibility of the facing is less important, the facing can be made of metal, such as aluminum or stainless steel, or other suitable materials, such as hardwood. However, even if flexibility is not required, a suitable plastic material is preferred. Particularly suitable materials are of the type made by impregnating a layer of textile material with a thermoset resin.

Advantageously, the facing material is fixed to the surface of the filter plate with an adhesive. Adhesives of the epoxy resin type have been found to be particularly suitable. If the surface material is made of multiple laths 114 as described above, it is recommended that the first lath be precisely aligned on the filter plate so that it will be vertical during use and fixed with screws for added stability. . The remaining laths are then installed one by one using the already positioned laths as guides.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a tubular pressure filter. 2 is an enlarged cross-sectional view of the upper end of the internal assembly of the tubular pressure filter of FIG. 1; FIG. FIG. 3 corresponds to FIG. 2 but shows the lower end of the internal assembly. FIG. 4 is a cross-sectional view taken along the - line in FIG. 2 in the direction of the arrow. FIG. 5 is an enlarged view of a portion of FIG. 4. FIG. 6 is an enlarged sectional view of another alternative profile to the exterior element shown in FIG. 5; FIG. 7 corresponds to FIG. 5, but shows another contour. FIG. 8 is a view of one side of the filter plate unit. Figure 9 shows - of Figure 8.
FIG. 3 is a cross-sectional view taken along the line in the direction of the arrow. 1st
FIG. 0 is a sectional view taken along the - line in FIG. 8 in the direction of the arrow. FIG. 11 is a partially enlarged view of FIG. 10. FIG. 12 is a partially enlarged view of FIG. 9. FIG. 13 is a view showing one side of another form of the filter plate unit. FIG. 14 is a sectional view taken along the line XI-XI in FIG. 13 in the direction of the arrow. 20...filter device, filter element, permeable medium, 42,116...duct, 44,118...
Opening, slot, 6, 102... Supporting member, core material, 40, 114... Surface material, lath, 2... Internal assembly, 4... External assembly, 12... Annular chamber, 4
8... Impermeable thin film, 16... Inner compartment, 14
...outer compartment, 28...supply device, supply conduit,
30... Pressure fluid supply device, inlet manifold, 50...
...Insertion part, 8, 10... End piece, 46, 52
...Annular groove, 48, 56...Chamber, annular chamber, 102
...Filter plate, 126, 128, 138, 14
0...Opening, 122, 124, 136...Groove.

Claims (1)

Claims: 1. A support assembly for supporting a filter device 20, said support assembly being provided with a duct 42, 116 for receiving liquid passed through the filter device 20, and comprising a support assembly and a filter device 20; and a pressure filter having an opening 44 , 118 communicating the region between the duct 42 , 116 , the support assembly comprising a support member 6 having a facing having an outer surface supporting the filter device 20 . ,10
2, the surface material constitutes the duct 42, 116 and the opening 44, 118, the duct 42,
116 is disposed inside the outer surface of the facing so as to convey liquid substantially parallel to said outer surface. 2. The pressure filter according to claim 1, wherein the openings 44, 118 are narrower than the ducts 42, 116. 3 The duct 42,116 is a plurality of ducts 42,1
3. Pressure filter according to claim 1 or 2, characterized in that it is one of 16, each duct 42, 116 having said opening 44, 118. 4 Each opening 44, 118 is connected to a respective duct 4.
2,116 slots extending along substantially the entire length of the device.
The pressure filter according to any one of clauses 3 to 4. 5 The surface material is a plurality of surface material elements 40, 114
A pressure filter according to any one of claims 1 to 4, characterized in that the pressure filter is comprised of: 6. The pressure filter according to claim 5, wherein the surface material elements 40, 114 are made of lath. 7. Facing elements 40, 114 are mounted on support members 6, 102 in abutment with each other, each duct 42,
7. A pressure filter according to claim 5 or claim 6, characterized in that an opening 44,118 is formed between each adjacent facing element 40,114. 8. Claim 5, characterized in that the facing elements 40, 114 are constructed from a material made by impregnating a layer of textile material with a thermosetting resin.
The pressure filter according to any one of Items 7 to 7. 9. Pressure filter according to any one of claims 5 to 8, characterized in that the facing element 40, 114 is fixed to the support member 6, 102 by means of an adhesive. 10. Any one of claims 5 to 9, characterized in that the facing elements 40, 114 are shaped so that the outer surface of the facing has a grooved or wavy appearance. Pressure filter as described in . 11 the pressure filter is a tubular pressure filter, the tubular pressure filter comprising: an inner assembly forming a support assembly; and a generally tubular outer assembly 4 surrounding the inner assembly.
and; an annular chamber 12 created between the inner assembly and the outer assembly 4 is divided into an inner compartment 16 and an outer compartment 14 by an impervious membrane 18 disposed inside the outer assembly 4; an inner compartment 16 adjacent the outer surface of the inner assembly;
a filter element 20 constituting a filter arrangement arranged within the interior of the filter; a device 28 for supplying a mixture of liquid and solid particles to the inner compartment 16; leaving the solid particles deposited on the filter element 20; The liquid in the inner compartment 16 is filtered through the filter element 20.
a device 30 for supplying pressurized fluid to the outer compartment 14 in such a way that the liquid enters the duct 42 through the opening 44 and is directed in the longitudinal direction of the inner assembly. The pressure filter according to any one of claims 1 to 10, characterized in that the pressure filter has a diameter of 100 mm. 12. A tubular pressure filter according to claim 11, wherein each duct 42 extends in the longitudinal direction of the internal assembly. 13 Each facing element 40 extends in the longitudinal direction of the inner assembly and includes a pair of opposedly disposed insert portions 50, said insert portions 50 engaging the end pieces 8, 10 of the inner assembly. Together, the end pieces 8, 10
The tube shape according to claim 11 or 12 when dependent on any one of claims 5 to 7, characterized in that the tube shape is positioned with respect to the facing element 40. pressure filter. 14 An annular groove 4 in which each end piece 8, 10 receives a respective one of the insert portions 50 of each facing element 40;
14. The tubular pressure filter according to claim 13, comprising: 6,52. 15 The depth of the annular groove 46, 52 in at least one of each end piece 8, 10 is greater than the length of the spigot portion 50 received in said annular groove 46, 52, so that the chamber 48 , 56 is the annular groove 46, 5
15. The tubular pressure filter according to claim 14, wherein the tubular pressure filter is provided at the base of the pipe. 16 the pressure filter is a tubular pressure filter, the tubular pressure filter comprising: an inner assembly; a generally tubular outer assembly forming a support assembly surrounding the inner assembly; an inner assembly and an outer assembly; an annular chamber formed between the three-dimensional body is divided into an inner compartment and an outer compartment by an impermeable thin film disposed inside the outer assembly; and on the inner surface of the outer assembly. a filter element constituting a filter arrangement arranged in an adjacent outer compartment; a device for supplying a mixture of liquid and solid particles to the outer compartment; leaving the solid particles deposited on the filter element; ,
a device for supplying pressurized fluid to the inner compartment so as to force the liquid in the outer compartment out of the filter element, the liquid flowing through the opening into the duct and displacing the liquid in the outer compartment; 11. A pressure filter according to claim 1, wherein the pressure filter is adapted to be guided in a direction. 17. The pressure filter is a plate-type filter press, the plate-type filter press is composed of a plurality of filter plate units, each of the filter plate units is provided with a filter plate 102, and the filter plate 102
A pressure filter according to any one of claims 1 to 10, comprising filter elements constituting the support assembly and constituting the permeable medium on both sides. . 18 interconnecting at least some of the ducts 116 and connecting these ducts with openings 126, 128, 138, 14 on the filter plate 102;
Claim 1, characterized in that grooves 122, 124, 136 are provided to communicate with each other.
Pressure filter according to item 7. 19 The filter plate 102 is attached to two of its sides.
19. A pressure filter as claimed in claim 18, characterized in that it has a rectangular shape with two horizontally arranged sides and a groove (124) is provided at the bottom of the surface material. 20 Another groove 122 is provided at the top of the facing material, and this groove 122 is connected to another groove 122 of the filter plate 102.
20. A pressure filter according to claim 19, characterized in that it communicates with two openings (126). 21. A pressure filter according to claim 18, characterized in that the filter plate is circular and the grooves 136 extend continuously around the outer circumference of the facing material. 22. Claims 18 to 22, characterized in that the groove is formed by a recess formed in the surface material.
22. Pressure filter according to any one of clauses 21 to 22.