DE3806208A1 - Filter arrangement - Google Patents

Abstract

Published without abstract.

Description

The invention relates to units for a filter system. In particular, the invention relates to an insert plate for Filter arrangements. The invention further relates to a filter insert. Finally, the subject of the invention also a filter arrangement with a housing and therein arranged filters.

Filter arrangements are known in which a filter in a filter housing closed with a cover unit is arranged. Through a special design of the Lid can be pumped fluid to be filtered into the housing and the cleaned fluid, filtrate, leaves after Flow through the filter through a pipe joint the lid.

The filters are replaced in such filter arrangements by removing the cover from the assembly Filter turned off, e.g. B. unscrewed, new filter be attached and the lid with the fresh filters is reattached to the housing. With the known System it is necessary to touch the filter itself and the housing is exposed to the filtration fluid. Therefore, it is required that the housing and also the cover made of material is manufactured that has both the mechanical properties owns it under the filtration process conditions exposed, as well as has the chemical properties, to withstand the medium to be filtered.  

Another disadvantage of the known systems is that that behaves between the filter elements and the housing there is inevitably large volume in which inevitable Fluid residues remain. This is especially the case with expensive ones filtering materials undesirable.

The problems described above become significant as a result reinforces that common in modern process engineering to filter highly aggressive chemicals, and that this is at high temperatures and high pressures. Finally, toxic substances, e.g. B. in Connection with pharmaceutical and biochemical Procedures, and radioactive materials are filtered. To the So far, handling of such products has been extraordinary elaborate filter systems have been used and changing the filter has always been a very expensive process.

The object of the invention is filter arrangements and Bauelemen te for such filter arrangements to create an extreme enable easy replacement of filters. Another one There is a problem to be solved by the invention in the ability to filter without risk of contamination switch. An additional object of the invention is filters to create arrangements and their components that made it possible Lichen, while maintaining the mechanical and chemical Resilience a contamination-free, fast, safe and enable inexpensive replacement of the filters. The Units and filter elements should preferably be like this be designed so that the inevitable in the filtration Loss of fluid is kept to a minimum.

Another technical problem, the solution of the invention strives to achieve greater flow rates Filter systems also for fluids with higher viscosities enable. It should continue to be a pre-assembled Komplettsy stem for various types of aggressive or out other unwieldy liquids are created,  without the personnel with the fluid when changing the filter Contact device.

An additional technical problem caused by the invention to be solved consists in cleaning the inner Surface of filter housings. Such cleaning is always a technically complex and costly affair Ness. It is therefore extremely desirable to clean the inner surface of filter housings in particular Avoid security reasons.

A special technical problem arises with some filters Housing materials in the form of diffusion. To filter the material diffuses through the filter in some cases housing, especially if this filter housing for a long time Use is.

The above technical problems are solved and the advantages resulting from the description achieved by the insert plates according to the invention, the inventive plates Filter cartridges and the filter arrangements as in the Claims are defined. Preferred embodiments are characterized in the dependent claims.

The insert plate according to the invention for filter arrangements carries all sealing functions of the filter unit. These Insert plate has a first and a second revolve the closed sealing area. This sealant rich is preferably in the peripheral region of the insert plate. In the simplest case, the two sealing areas are open the top or bottom of the insert plate and arranged opposite each other. The insert plate will in use between two bounding the filter system Divide, preferably sandwich-like and over the circumference kept sealed on both sides.  

The openings for attaching are still in the insert plate filter elements such as filter candles intended. Each of these openings is a sealing area assigned in which the filter candle is sealingly attached can. The inside of the filter candle is in fluid flow Connection to the opening in question. Preferably points the insert plate according to the invention two to eight, in particular re three to five, and preferably three openings for Connection of filter elements, especially filter cartridges.

The way of attaching the filter elements or Filter cartridges on the insert plate can have a plug connection, a screw connection and also an adhesive connection. The connection can in particular be a non-releasable connection be executed when, as is currently preferred, the insert plate is used in a filter arrangement, in which the entire filter insert including insert plate can be changed.

The insert plate separates the clean side from the unclean side. The fact that the insert plate in its peripheral region two Has sealing areas, namely a first Dichtbebe rich between the clean room side of the insert plate and the Environment, and a second sealing area between the Contamination of the plate and the environment is prevented in the event of a leak in these circumferential sealing areas Fluid flow from the unclean room directly into the clean room can. Rather, such leaks result in fluid flow into the Outside space, and such leakage flow can appear and be corrected without an initially undetected fluid could flow from the unclean room into the clean room.

The insert plate according to the invention also has a Port opening on which is a port sealing area assigned. Over this connection sealing area can a connecting line connected to the insert plate be that fluid can be directed into the unclean room.  

With the exception of openings for instrument connections or The insert plate has no further safety valves Openings for functional fluid flow.

It is preferred that the first and / or the second be closed sealing area on the insert plate in one piece with this is connected. In particular, this Dichtungsbe rich in the form of one or more circumferential, closed ner, hard bulging surveys. These circumferential bead-like elevation has the function in a softer counterpart material to be pressed in tightly. It is particularly advantageous here, the bead-like elevation in the form of a wave-like, circumferential, bead-like crest training exercise. It is preferred the bead-like elevation so to train and the soft material with which this in Engagement is assigned so that a mechanically fixed Connection between the insert plate and that with the closed sealing area engaged material is formed.

To facilitate handling, it is useful to Insert plate laterally outside the closed seal areas with at least two in one piece with the insert plate connected handle tabs. With the help of this The entire tab assigned to the insert plate can be tabs Filter unit can be handled.

The insert plate shows in its preferred structural Design a flat outdoor area on the top side of the first closed sealing area and on its Bottom of the second closed sealing area arranged is not. The flat outer area then closes inside an inclined, in particular frustoconical transition area. At this approaching transition area rich, in turn, is followed by a flat interior. At this interior is one piece for each filter element or for each filter candle a short tube-shaped or  flange-like approach provided, in the inside of which Filter candle or the filter element are attached sealingly can. These flange-like approaches preferably have from both the flat interior and the flat Outside the insert plate away. In addition, that is flat interior formed a connection piece, by which the connection opening runs. The connecting piece points the sealing area. Preferably, the Connection piece in the opposite direction to the flange like approaches for the filter candle on the flat interior richly educated. The connection piece is also in one piece molded with the interior of the insert plate.

According to the present invention, furthermore, a filter mission presented. This filter cartridge can be made as a whole a filter arrangement can be removed without a there is a particular risk of contamination. In particular it is possible with the filter insert of the invention, the change gear without ever touching a filter element.

The filter insert according to the invention has an insert plate as well as at least one filter element that matches the insert plate each connected in this way via a passage is that the fluid is from the clean room side of the insert plate can flow to the unclean side of the insert plate. From apart from the fluid supply in the unclean room, the fluid can only via the filter element or the filter elements from the Clean room side to the clean room side of the filter insert reach.

The filter insert according to the invention also has one Outer skin, which is preferably made of resilient material is shaped. This outer skin can be used under operating conditions ver by at least a small but significant range be shaped or stretched. The outer skin forms with the inner side of the insert plate a first room in which the Filter elements that are attached to the insert plate  are arranged. Via an opening in the insert plate Flow fluid from or to the first room.

Preferably, the sealing connection between the Insert plate and the outer skin on the circumference of the insert plate and outer skin such that when the outer skin is separated from the insert plate this does not seal again Intervention can be brought together. The latter can especially due to the wavy, bead-like circumferential sealing areas of the insert plate can be achieved.

The filter insert according to the invention finally has one End plate on that with the outer side of the insert plate creates a second room that goes over the passage or the passages on which the filter elements or Filter candles are attached and the filter elements or the Filter candles in fluid flow communication with the first space stands. An opening is provided in the end plate, through which fluid can flow to or from the second space. The openings are preferably in the insert plate and in the end plate, the only feed or discharge openings through these components.

The filter insert preferred according to the invention thus consists of a firmly connected unit consisting of an end plate, Intermediate plate and outer skin is composed, and in the in the space between the insert plate or intermediate plate and the outer skin in the space between the insert plate or Intermediate plate and the outer skin several filter elements, preferably three to five, in particular three such filters elements, which are preferably designed as filter candles, are arranged. As such, the filter insert can consist of a Filter arrangement can be removed. In particular, the Filter insert can be replaced as a whole unit. This eliminates the requirement that when handling and changing the filter  Personnel ever with the filter elements as such in Contact tion is coming.

The preferred design of the seal for the first and the second space is so with the filter insert of the invention designed that the insert plate in a sandwich-like Structure between a flange-like approach to the outer skin and a peripheral region of the end plate is arranged. The insert plate is preferably designed as above described. The bead-like projections are in the edge reach the end plate and in the flange-like approach the outer skin with the formation of a firm connection pressed. The fixed connection is preferably a mechanical sche, d. H. essentially friction based connection. The three components can also in the sealing area glued or welded together. An advantage this inventive construction of the filter insert is that there is a leak in these sealing areas always causes the fluid to either come out of the dirty room into the outside space or from the clean room into the outside space flows, however, out of a flow of fluid to be filtered the unclean room in the clean room is practically excluded.

Another embodiment of the filter according to the invention set has a dip tube, which with the opening in the Insert plate communicates and that into the first room protrudes. The length of this dip tube can be based on the special Requirements for the filter insert are met. The Dip tube can have multiple openings to a specific one Provide flow behavior along the filter. Especially it is preferred if the immersion tube is essentially one Cross section that is between the parallel to the dive tube arranged filter candles corresponds to the space left. It is also possible to close the dip tube with profile ribs provided for volume and flow optimization.  

The filter insert is preferably so con structures that in the end plate another passage is provided with the opening in the insert plate is engaged in such a way that the fluid only through this Passage and the opening in the insert plate in the first Space can flow. The second room is in this execution ring shape and surrounds this connection between the first room and the exterior of the overall arrangement.

According to the invention, a filter housing or an overall filter arrangement is provided which contains a container, a lid and one between the container and the lid Nete filter unit has. The filter is preferably located unit with a flange attached to the outer skin cut open on a holding area of the container during the Cover rests on the end plate. A special one simple construction results when the container has a Closure flange has a larger diameter than has a flange area of the filter insert, on which outer area of the flange of the container and on the corresponding outer area of the cover connection directions, such as superimposed holes are arranged. The closing pressure of the lid on the The container then presses the end plate and flange at the same time part of the outer skin together on the intermediate plate or Insert plate. All that is required then is to introduce one Feed pipe and a discharge pipe through two openings in the Cover in the respective openings of the end plate or the insert plate or intermediate plate. Preferably, the Space between the outer skin of the filter insert and the Container jacket filled by a molded body. It can the molded body and the container casing are made of one piece hen. The molded body can also be placed separately in the container be used. The outer skin is then in operation Filters pressed against this molded body. The dead volume for the liquid to be filtered is therefore absolutely  Minimum limits, namely the volume that is required to Inflow of the filter elements is absolutely necessary.

The skin or outer skin is preferably all over The circumference is essentially the same thickness (irregularities can come from the shaping process of the skin). The skin or Outer skin is separate from or unconnected with the packing by.

According to the invention, the pressure-bearing function of the Container shell and the sealing function of the outer skin in separate components realized.

A feed pipe elbow is preferably in the sealing Connection engages with the insert plate opening so that Fluid to be filtered through the first space through this Pipe elbow can flow. Another Pipe elbow is in sealing engagement with the opening in the end plate so that filtrate from the second room through can drain this further elbow.

The devices according to the invention can differ from the made of the best materials. The following list lung describes the preferred materials.

Cover of the filter arrangement and pressure-bearing container:
Tensile metals, especially steel.
Insert plate or intermediate plate: hard plastic, especially polyamide.
End plate: plastic, especially polypropylene, polyethylene, ABS copolymer.
Outer skin: plastic, in particular polyethylene, polypropylene, polybutadiene, butadiene-styrene copolymer, polyamide.
Packing or profile body: plastic, in particular polyamide and sintered polyfluorocarbon, in particular sintered polytetrafluoroethylene, foamed polystyrene.

Further preferred details emerge from the following the description of an embodiment of the fiction moderate objects. Show in the drawing

Fig. 1 is an exploded Längsschittdarstellung the entire filter assembly,

Fig. 2 is a cross-sectional drawing through the Filteranord voltage along the line 2.2 in FIG. 1,

FIGS. 3 and 4 are detail views.

In Fig. 1, a filter arrangement 1 according to the invention. In a pressure-bearing container 2 made of metal, e.g. B. steel, a filter insert 3 is arranged. The filter arrangement is closed by a cover 4 . Lid 4 and container 2 are, for. B. hold together by screw connections. In Fig. 1 lid 4 and container 2 are shown pulled apart. Only the holes 41 and 21 for the connections are shown. Of course, it is also possible to make the connections between the container 2 and the lid 4 using z. B. to effect union nuts.

In the exemplary embodiment in FIGS. 1 and 2, the filter insert 3 contains three filter elements, namely filter candles 31 . These are arranged symmetrically in the container 2 with a circular cross-section, the axes of the filter candles lying on the corners of an equilateral triangle.

An immersion tube 32 is arranged centrally between the three filter elements 31 . This dip tube has openings 321 through which the fluid to be filtered can gelan conditions on the filter 31 . Around the filter 31 there is an outer skin 33 made of somewhat resilient plastic material, e.g. B. Polypropy len or polyethylene. The outer skin 33 can be easily deformed by the operating pressure of the fluid to be filtered. The outer skin is pressed against the profile body 5 , which largely fills the space between the filter elements 31 and the pressure-bearing container 2 . Only the space 6 required for the intended flow of the fluid to be filtered around the filter elements is free.

The filter elements 31 are connected to an intermediate plate 8 via a sealing ring 7 . This intermediate plate 8 is in one piece from a hard plastic, preferably injection molded. The sealing connection between the intermediate plate 8 and the filter element 31 takes place in a passage 81 of a tubular extension 82 of the intermediate plate 8 . There are three such pipe lugs 82 . These pipe lugs 82 are in communication with an inner portion 83 of the intermediate plate 8th The pipe sections 81 protrude downward from this inner section 83 . On the outside, the pipe sections 82 carry and guide the immersion pipe 32 , which is inserted into the intermediate plate 8 .

At the inner substantially flat region 83 of the inter mediate plate 8 is followed by a truncated cone-shaped section 84 , which in turn merges into a substantially flat outer area 85 . Projecting upwards from the intermediate plate and arranged centrally, an extension piece 86 is connected to the inner region 83 of the intermediate plate 8 . This extension 86 serves for the liquid-tight connection with an extension 96 which projects downward from an end plate 9 . The two lugs 86 and 96 together form the feed channel 98 into the unclean space of the filter insert 3 .

In the outer portion 85 of the insert plate 8 or intermediate plate 8 , two sealing areas 87 and 88 are provided.

The upper sealing region 87 is formed by two wavy along the circumference of the intermediate plate 8 sealing beads 871 and 872 (see. Fig. 4). These wave-shaped sealing beads 871 and 872 are formed from the hard plastic of the intermediate plate 8 and pressed into the softer plastic of the end plate. The end plate 9 does not need to provide mechanically high pressures because it is carried by the pressure-bearing container terdeckel 4 and is prevented from yielding. A piece of two tabs 810 are preferably attached to the outside of the insert plate 8 to lift out the filter insert. Such a tab 810 is shown in supervision in FIG. 4.

The sealing area 88 is also provided with two wavy sealing beads. These are arranged on the lower periphery of the intermediate plate and are pressed into the flange section 331 of the outer skin, which is also made of softer, resilient plastic. The connection between the end plate, the intermediate plate and the outer skin is designed so that these three parts hold together and can be moved as a unit without further guiding measures.

The dip tube 32 is inserted with its lower end 322 into an internally projecting extension 332 of the outer skin 32 and guided therein, for. B. with the help of warts that jump into a ring of the dip tube.

Preferably, the end plate, intermediate plate, outer skin, dip tube are all molded from plastic. The entire Filterein set 3 can be easily removed from the container 2 and removed as a whole. It is just as easy to reinsert a new filter insert 3 . Any contamination is avoided. The dead space for the fluid to be filtered is reduced to its absolute minimum. A cleaning of the inside of the container shell is unnecessary.

In particular, no metal part of the filter arrangement, that is to say in particular neither the lid 4 nor the container 2, is exposed to the liquid to be filtered or the filtrate. The outer skin 33 together with the intermediate plate 8 forms the unclean space 833 . The intermediate plate 8 and the end plate 9 together form the clean room 890 of the filter insert 3 . The liquid to be filtered is passed through a pipe bend 10 into the unclean space 833 of the filter insert. The pipe elbow 10 is connected via a sealing ring 101 to a through channel 89 of the intermediate plate. If the seal 101 is sufficiently good, there is also no risk of leakage between the clean room 890 and the unclean room 833 in the transition region between the connecting extension 96 of the end plate 9 and the connecting extension 86 of the intermediate plate 8 . Nevertheless, it is preferred to design this toothed transition area or Verbindungsbe area between the end plate and the intermediate plate liquid-tight, in particular to prevent the escape of purified filtrate into the channel 98 .

Between the intermediate plate 8 and the end plate 9 there are preferably several, in particular four to six, supports 17 arranged symmetrically over the circumference. These supports 17 each consist of an extension 917 on the intermediate plate 8 , as shown in FIG. 3. For attaching ventilation, measuring instruments, safety valves and. Like. The pressure support 17 may have a bore 170 which extends through both lugs 817 , 819 and the plates 8 and 9 .

It is possible and preferred to provide a vent hole in the radial direction in the projection 82 , specifically in the region between the upper end of the dip tube 32 and the lower end of the pipe bend 10 .

A pipe bend 20 for removing the filtrate with a sealing ring 21 is sealingly mounted in the inner bore of a shoulder 95 of the end plate 9 . The connection to the annular clean room 890 of the filter insert 3 is established via this pipe elbow 20 .

Both the elbow 10 for the supply of fluid to be filtered and the elbow 20 for the discharge of filtrate are guided through openings (not shown) in the container lid 4 .

The filter arrangement according to the invention and the inventive his components have the following significant features and Advantages:

• - The multistack plastic housing of the filter insert can be disposable made entirely of plastic;
• - Filtration of air for magnetic tape or magnetic disks Systems with high flow rates,
• - Filtration of deionized water at high temperatures doors and high pressures,
• - Filtration of highly aggressive chemicals at high Temperatures and pressures,
• - Filtration of dangerous, e.g. B. toxic or radioactive substances,
• - no leakage between clean room and unclean room,
• - minimized dead volume,
• - Greater flow rates also for higher viscosities ten,
• - Free design of the internal flow channels around the filter housing,  
• - Assembly of the unit in the clean room possible.

Construction features:

• - outer skin around the filter elements,
• - Packing against which the stretchable or elastic Outer skin supports for pressure transfer to the metal housing wall,
• - Immersion tube for structuring the fluid flow, in particular for the in-line technique,
• - ring-shaped collecting room with only decentralized exit kicks
• - Venting through the filter insert elements is possible and the vent through the inlet port is not more necessary;
• - Outer skin, intermediate plate and dip tube are through Snap connections captively attached to each other,
• - The outer skin and dip tube are on their surfaces Profilable to generate defined flow conditions de;
• - by simply changing the outer skin and profile dimensions can change the channel sizes for the inflow without changing the expensive metal case.

Claims (15)

1. insert plate, in particular one-piece plastic insert plate, for filter arrangements, characterized by

• a) a first circumferential closed sealing area,
• b) a second circumferential closed sealing area,
• c) a clean room side of the insert plate within the first circumferential closed sealing area,
• d) an impurity side of the insert plate within the second circumferential closed sealing area,
• e) at least one opening running through the insert plate from the clean room side to the unclean side of the insert plate for attaching a filter candle, each of these openings being assigned a filter sealing area to which a filter candle can be sealingly attached so that its interior also coexists the opening is in fluid flow connection,
• f) at least one connection opening, which is assigned a connection-sealing device area and which is designed and arranged such that a connection plate with a connection passage section is sealingly engageable with this connection-sealing area.

2. insert plate according to claim 1, characterized in that the first and / or the second closed you area of the insert plate in one piece with this as at least one encircling, closed, hard bulge term survey is formed. 3. insert plate according to claim 2, characterized in that the bead-like elevation as a wavy circumferential, bead-like elevation is formed. 4. insert plate according to one of claims 1 to 3, characterized characterized in that the insert plate laterally outside of the closed sealing areas with one piece the insert plate has connected tabs. 5. Insert plate according to one of claims 1 to 4, characterized by

• a flat outer area, on the upper side of which the first circumferential sealing area is formed and on the underside of which the second circumferential sealing area is formed,
• a transition region tapering inwards towards the outer region, in particular tapering in the shape of a truncated cone,
• - A flat inner area adjoining the transition area on the inside
• - A flange attachment is attached in one piece for each filter cartridge, the inside of the flange attachment in question forming the opening for the filter cartridge and having the sealing area for the filter cartridge connection,
• - A connection piece is formed in one piece, through which the connection opening runs.

6. Filter insert, characterized by

• a) an insert plate
• b) at least one filter element, which is sealingly connected to the insert plate via a respective passage such that fluid can flow from one side of the insert plate through the filter elements to the other side of the insert plate,
• c) an outer skin which is sealingly connected to the insert plate so that it creates a first space with the inner side of the insert plate, in which the filter elements are arranged,
• d) an opening in the insert plate through which fluid can flow from or to the first space,
• e) an end plate which, with the outer side of the insert plate, creates a second space which is in fluid flow communication with the first space via the passage (s) and the filter elements,
• f) an opening in the end plate through which fluid can flow to or from the second space.

7. Filter insert according to claim 6, characterized in that the insert plate in its edge area an inner  and has an outer circumferential sealing area, the one forming an annular sandwich-you tion structure with a corresponding annular Area of the end plate, as well as an annular Flange area of the outer skin is connected such that the peripheral edge area of the insert plate between the annular region of the end plate and the arranged annular flange area of the outer skin is. 8. Filter insert according to one of claims 6 or 7, characterized characterized in that with the opening in the insert plate a pipe extension projecting into the first space, preferably an immersion tube inserted into this opening is. 9. Filter insert according to claim 8, characterized in that the pipe neck at the free end with one inside the outer skin arranged guide is connected, the preferably at least one resiliently arranged Has guide element which with a recess in the pipe socket is in leading engagement. 10. Filter device according to one of claims 6 to 9, characterized in that the end plate a has another passage in fluid communication with the opening in the insert plate is such that Fluid through the passage opening only through this Opening can flow to or from the first room. 11. Filter device according to one of claims 6 to 9, characterized in that the insert plate so out is as defined in one of claims 1 to 5 rt. 12. Filter insert according to one of claims 1 to 11, characterized characterized in that the filter device as a  closed, usable and removable as a unit Unit is formed. 13. Filter housing, characterized in that it is a container,
a lid and
a filter device as defined in one of claims 6 to 13 between the container and the lid. 14. Filter housing according to claim 13, characterized in that

• a) the cover has a first and a second tube passage,
• b) a first tube is inserted through the first tube passage into the opening of the insert plate,
• c) a second tube is inserted into the opening of the end plate through the second tube passage.

15. Filter housing according to claim 13 or 14, characterized records that a shaped body is arranged in the container is largely the space between the inside of the Fills the container and the filter elements, whereby enough space for the outer skin and a fluid flow the filters remain.