DE102004001718A1 - Infinity filter for particle filtration - Google Patents

Abstract

The invention relates to a method for producing a filter (1, 48) for cleaning a flowing medium. The filter (1, 48) is made of an endless filter belt material (2), from which filter elements (33, 62) are formed. First, a fold pattern (37, 38, 39, 41, 42) is produced on the endless filter belt material (2). Thereafter, mutually oppositely oriented, adjacent filter elements (33, 62) from the endless filter belt material (2) are folded. Finally, cohesive connections (34, 35, 64, 65) are produced between side walls (39) of the filter elements (33, 62) both on the inflow side (8) and on the outflow side (9) of the filter (1, 48) during the gradual folding.

Description

technical area

particulate Filter, used to filter out particles from flowing media, can both be built according to the wall flow principle (Wall Flow Filter) or according to the mat principle being constructed. Unlike honeycomb filters, which are usually extruded or produced by a comparable method, can Particle filter constructed according to the mat principle matte parts from different Materials included. The base materials of the mats used ranging from ceramic to metallic substances, being the case of ceramics, these in the not yet sintered, mostly predried Condition or in the case of metallic substances in the finished state are processed. Made of metallic substances Mats are sintered in the finished state or as a fabric or as a combination of these.

Out DE 36 37 516 C1 Filter elements for dust filters are known. The filter elements are mounted in a separating tray between the dust gas and the clean gas side and surrounded by a dust gas entry, clean gas discharge and Staubaustrag provided housing. They are flowed through by the gases to be purified from outside to inside. From the adhering to the outer surface of the filter layer dust they are cleaned by means of a pressure gas to be operated cleaning device by back blowing in periodic order. When taking over the good properties of the filter elements in tube form can be accommodated at the same time a multiple of filter surface on the same installation space. For this purpose, the outer surface of the filter element to be filtered of wedge-shaped, around the central axis of the filter element lined up cells designed, which are similar to a hose at its upper end and converge at its lower end star-shaped on a center line. This is arranged in the direction of the individual cell bisectors.

Out EP 0 764 455 A2 is a filter for particulate filtering in exhaust gas and a device for treating exhaust gases with this particulate filter known. For example, the filter can be used on a diesel engine and, in addition to high throughput capacity, has excellent durability, is also very economical, and has excellent maintenance properties. The filter is made by cutting an end portion of a wound material. The spooled material is a high temperature resistant stainless steel having good heat resistance. The fibers obtained by separating from the material in coil form are formed into a band, this band is sintered in a subsequent processing step, and then the sintered band is heat-treated. In the heat treatment, an aluminum film is applied to the sintered fibers.

EP 12 56 369 A2 refers to a filter for exhaust aftertreatment and a filtering process. It is proposed an exhaust aftertreatment filter, which is included in the exhaust system of an internal combustion engine. The filter comprises an axially extending cylindrical filter roll containing a filter medium defining a number of axially extending channels. There is provided a first flow section, with flow channels and a second filtering section with alternately closed channels, which force the exhaust gas to flow through the filter medium. A core section is used for filter regeneration and produces an exothermic reaction. A catalytic converter filter contains a first catalytic section treated with a catalyst and a second filter section with alternately sealed channels.

EP 1 270 886 A1 relates to a method and apparatus for reducing nitrogen oxides in an exhaust system of a diesel engine. According to this method, carbon black and other ingredients are retained on a regenerable filter by electrical means and NO _X adsorbed to an _NOx adsorbent. The adsorbed NO _x is later reduced to N ₂ , using thermal energy, CO and hydrocarbon, which are provided when regenerating the filter.

EP-A-1 256 369 is e.g. to take an exhaust filter in which in a Pleated filter medium formed a plurality of axial channels is. The channels are each closed on one side. A compact design will achieved by winding up the pleated filter medium becomes. The wound filter is housed in a housing so that the outside flush with the filter on the housing wall is applied.

Another type of particulate filter is known from DE-C-36 37 516. In this patent filter elements for dust filter are removed, which are mounted in a separating tray between the dust gas and the clean gas side and are surrounded by a dust gas entry, clean gas and Staubgasaustrag provided housing. The filter elements are flowed from the gases to be purified from outside to inside. The filtering outer surface of the filter element is wedge-shaped designed around the central axis of the filter element juxtaposed cells, which are similar to a hose at its upper end and converge at its lower end in a star shape on a center line, which is arranged in the direction of the individual bisector of the cell. When operating the particulate filter for exhaust gas purification of motor vehicles, the filter elements over time due to the adsorbed soot to. For this reason, the filter elements must be cleaned regularly. This is done by heating, whereby the adsorbed soot particles burn off.

Filter configurations containing convolutions are out EP 0 765 455 known. There are described multiple waves of a filter material band, also shows EP 1 270 886 the multiple waves of a filter material, wherein this is brought into a circular shape. Honeycomb structures can according to EP 1 256 369 be formed as corrugated structures with closure of the waves around an imaginary axis. A disadvantage of filter elements with honeycomb structures are especially the long channels. Naturally, filters formed in honeycomb structures have clogged every second channel, so that the inlet cross-section is reduced to more than 50%, resulting in a pressure loss. Furthermore, there is a risk that the inlet openings of the channels of a honeycomb structure become clogged with soot and long channels are in danger of being filled with ash from the rear, which leads to a loss of filter area. In honeycomb structures, a radially different soot loading can occur, which has different Rußabbrandzeiten result, which burns inside quickly and externally delayed, resulting in thermoelectric strains.

presentation the invention

By the solution according to the invention is the Advantage of open area Structures used as filter elements and above all an economic Endless folding of the filter tape material representing the filter elements provided. The proposed endless folding solution avoids the disadvantage of many individual filter elements that individually with each other together Need to become. In the invention proposed solution only a line contact occurs the individual filter elements on the front and on the side, the is dense. A longitudinal connection and a seal on each individual filter element can by Use of the invention proposed solution now omitted.

Further occur through the invention proposed solution no radial thermal expansion problem when the proposed example used in roll filter form Filter is used for soot filtration and high temperatures arise at the filter elements during combustion of soot particles. The filter elements can Although on the downstream side be clamped by a flange, but are capable of radial Direction unrestricted to expand inwards. The same applies to the inflow side of Filters, where the filter element by means of a cap on her fixed radially inward side, but due to the Free space to the outer housing one radially outward directed thermal expansion possibility consists.

by virtue of the endless folding of the individual, for example, wedge-shaped form Filter elements are connected to each other with their Talsohlenstück each, whereby vibrations and a single deflection of the individual filter elements repressed become. Advantageously, at corresponding folding patterns of the produced in a continuous process Filter elements, the filter material bands without additional Punching and blanks folded directly and then processed further.

By a flowing one Adaptation, i. a change the Kantelänge from the shortest Length to to the greatest length quasi-steady ways, can in addition to circular or flat filter shapes also elliptical, oval or asymmetrical shapes.

drawing

Based the drawing, the invention is explained in more detail below.

It shows:

1 a wavy deformed filter belt material with inflow and outflow cover structures,

2 a filter housing part,

3 an embodiment of a filter in a rolled design with rotationally symmetrical cover plates,

4 . 5 and 6 wedge-folded filter elements in a flat arrangement,

7 a developed representation of the filter belt material,

8th a developed view of the filter belt material for an inclined filter element,

9a . 9b the rolled filter design in view and top view,

10 a detailed representation of a rolled filter design of filter belt material,

11 a filter module inserted into a housing,

12 the folded template for a rolled filter design made of endless filter belt material,

13 a folding scheme for filter elements with a shortened edge surface,

14 a filter element with rising sole in the flow direction,

15a . 15b . 16a . 16b . 17 . 18 a filter element with inflow and outflow reinforcing strips,

19 the perspective reproduction finished folded filter belt material,

20 . 21 . 22 Views of filter elements that are welded

22 inflow filter elements joined together,

23 - 25 in the filter elements embedded spacers and

26 . 27 split filters.

variants

1 is a corrugated filter belt material with ingress and Abströmseitigen cover structures can be seen.

From the illustration according to 1 shows that in a filter belt material 2 a corrugated structure is formed. Rounded tips 3 of the filter belt material 2 limit channels of the filter belt material 2 on an inflow side 8th through a first cover structure 6 be closed. The at the first cover structure 6 trained first closing surfaces 21 are corresponding to those in the filter belt material 2 formed channels formed and close these on the outflow side 8th , On a discharge side 9 is a second cover structure 7 provided, the second closing surfaces 22 are shaped so that by the corrugation of the filter belt material 2 formed and by the rounded tip 3 limited channels of the filter belt material 2 on the outflow side 9 are released. As a result, the medium to be cleaned is passed through a filter belt material 20 forced, what with a particle retention in the filter belt material 2 connected is. Instead of in 1 illustrated rounded tip 3 can the filter belt material 2 also be deformed so that peaks instead of rounded tips 3 to adjust.

In the filter belt material 2 they may be base materials of ceramic or metallic materials, which in the case of ceramics in the unsintered state and in the case of metallic materials used in the finished state sintered as a tissue or in combination thereof may be present. In the unsintered state ceramic films may optionally be designed using a support film, wherein the subsequent sintering takes place a solidification of the particular shape chosen.

In the 1 explosively represented corrugated structure of the filter belt material 2 as well as the first cover structure 6 and the second cover structure 7 can in an in 2 be housed housing part shown. The in 2 illustrated upper housing part 23 However, the disadvantage attaches to the fact that on the inflow side 8th an approximately 50% coverage of the inflow opening 12 is present. The same applies to the reference numerals 9 designated outflow side 9 on the housing part 23 , The wavy structure of the filter belt material 2 , in the representation according to 1 Wavy, is denoted by reference numerals 10 indicated.

3 shows an embodiment of a filter in a rolled version with rotationally symmetrical cover discs.

From the illustration according to 3 shows that the filter belt material 2 in the 1 has wave structure shown and is cylindrically shaped. On the inflow side 8th becomes the filter belt material 2 through the first rotationally symmetrical cover structure 6 locked. For this purpose have star-shaped fingers of the first covering structure 6 Free rooms 15 on which of the inflow side 8th passing through to be cleaned medium and into the spaces between the waves of the filter belt material 2 entry. The envelope 4 the first rotationally symmetrical cover structure 6 , the corrugated filter belt material 2 and the second cover structure 7 is with reference numerals 4 characterized. When passing through the envelope 4 enclosed deformed configuration of the filter belt material 2 is an axial channel 14 formed by the rotationally symmetrical first cover structure 6 is closed.

The on the outflow side 9 provided second cover structure 7 has closing surfaces 16 on which between the individual waves of the filter ribbon material 2 immerse, which causes that over the free spaces 15 in the filter 1 inflowing medium, the wall of the filter belt material 2-indicated by reference numeral 20 must pass through and over the between the closing surfaces 16 the second cover structure 7 trained openings flows out.

The 4 . 5 and 6 are wedge-folded filter elements from a filter belt material in a flat arrangement to remove.

Out 4 it turns out that from an endless filter belt material 2 adjoining filter elements 33 be formed. Each of the pie-shaped filter elements 33 includes two side surfaces 39 as well as a floor or roof area 38 , In terms of the inflow side 8th has the filter elements shown in the middle 33 an inlet cross-section 31 on which by front edges 32 adjacent filter elements 33 is limited. In terms of over the inlet cross section 31 incoming flow of the medium to be cleaned are the side walls 39 the filter elements 33 obliquely to the flow direction of the medium to be cleaned. The inlet cross section 31 is almost completely available for the entry of the flowing medium and is only by the at the front edge 32 illustrated first sealing seams 34 to oppositely arranged filter elements 33 limited. Each of the filter elements 33 from an endless, ceramic substances or metallic substances containing filter belt material 2 includes a floor or roof area 38 as well as two side walls 39 , In the area of the first sealing seam 34 are the side walls 39 two adjoining filter elements 33 sealingly joined together, which can be done for example via a welding process, such as laser welding or other cohesive joining process. The same applies to second sealing seams 35 on the outflow side 9 the pie-shaped configured filter elements 33 are formed.

4 shows several juxtaposed filter elements 33 , which are enclosed by a rectangular shaped here housing. The inlet cross section 31 is through two first sealing seams 34 limited. The first sealing seams 34 are designed so that a film expansion of the sidewalls 39 the filter elements 33 can be done within the rectangular shaped housing and the height expansion is not hindered. This is especially true in the thermal recovery of the individual filter elements 33 of importance, due to the temperatures it burns down in the side walls 39 the filter elements 33 retained soot particles comes to strains.

6 is to take a plan view of inclined filter elements. In terms of the inflow side 8th are the side walls 39 of the endless filter belt material 2 tilted so that the medium to be cleaned passing through the side walls 39 and the top and bottom walls 38 the filter elements 33 is imposed. The particles contained in the flowing medium are stored in the side walls 39 and the top and bottom walls 38 of the filter belt material 2 off, so that on the outflow side 9 exiting from particles purified flowing medium. The inclination of the side walls 39 the filter elements 33 is by reference numerals 36 indicated.

7 shows a developed view of the endless filter belt material.

In the 7 illustrated folding template illustrates that from a present in continuous form filter belt material 2 one side wall each 39 , an adjoining floor or roof area 38 , another side wall 39 etc. be formed. The side walls 39 stand at right angles on the floor surface 38 and are perpendicular to the corresponding corresponding roof surface 38 shaped. When erecting the side walls 39 in relation to the floor area 38 or when kinking the side walls 39 from the roof areas 38 of the filter belt material 2 form on the inflow side 8th first sealing seams 34 or on the outflow side 9 second sealing seams 35 that run in a vertical direction.

In the developed representation according to 7 are the halves of the bottom surface 38 or the roof area indicated by dash-dotted lines.

The gussets emerging from the short sides of the rectangles 39 and the edge of the filter-shaped strip material 2 are formed are cut or punched out.

The representation according to 8th is the unwound form of the filter tape material to be assembled, which without the in 7 shown gusset areas is formed, refer to.

From the illustration according to 8th shows that there is an inclination of the leading and trailing edges of the folding pattern.

The 9a . 9b show a rolled filter version in semicircular reproduced view and in plan view.

Instead of in 4 shown flat arrangement of the individual filter elements 33 of the filter 1 that according to a Keilfaltung 30 can be formed, the individual filter elements 33 also in a rolled version, indicated by reference numerals 40 according to 9a , be configured. These are the finished folded filter elements 33 within the envelope 4 arranged in a circle or semi-circular. With reference number 42 is the back, ie the wide side of the wedge filter elements 33 designated. With reference number 34 the first sealing seam is marked. With b _i is the width of a valley bottom 41 a filter element 33 , with b _a is the width of the back part 42 of the filter element 33 designated. The bottoms 41 the semicircular filter elements 33 limit a passageway. As the individual filter elements 33 along the first sealing seams 34 and the in 9b illustrated second sealing seams 35 connected to each other, they can easily perform radial expansions, as there is sufficient space for expansion. The height of the individual filter elements 33 is denoted by h. The used filter belt material 2 preferably has a wall thickness between 0.3 to 0.4 mm and a mean pore size of 10 microns, such as wall flow filter, which are used for soot filtration.

From the illustration according to 10 is a detailed representation of a rolled filter design of filter tape material in more detail. From this representation it appears that in the area of the valley bottom 41 the individual filter elements 33 one with slots 44 provided front cover 43 intervenes. The first sealing seams running in the vertical direction 34 where the individual filter elements 33 in the area of the inflow side 8th cohesively and tightly connected to each other are from the front cover disc 43 held. The front cover disc 43 is placed centrally and fixes the trained in rolled Keilfaltung individual filter elements 33 of the endless filter belt material 2 on the inflow side 8th , The entry cross sections 31 thus stand up to the envelope 4 open, leaving that in the filter elements 33 through the inlet cross section 31 Entering, to be cleaned medium unhindered in the roll module 48 as shown in 10 can flow in. In the area of the outflow side 9 is a flange 45 formed, the inner contouring 47 the back 42 the individual superimposed filter elements 33 overlaps. The flange 45 Just go over your back 42 the filter elements 33 pushed and fixed and seals them outward on the outflow side 9 from. On the outflow side 9 are the individual filter elements 33 each with second sealing seams 35 material firmly connected to each other, for example, welded together. Because of the outflow side 9 formed second sealing seams 35 that's on the inflow side 8th over the entry cross sections 31 into the individual filter elements 33 inflowing medium forced through the side walls 39 to flow, in which the particle loading of the medium to be cleaned is retained. With reference number 46 is the back end of the back 42 of the filter element 33 designated. From the in 10 reproduced representation of the roll module 48 shows that a tight pack of filter elements 33 is possible, with these on the inflow side 8th sealing over the first sealing seams 34 as well as the disc 43 and on the outflow side 9 sealing over the second sealing seams 35 with each other and over the flange 45 are connected.

The representation according to 11 is a filter module inserted into a housing as shown in FIG 10 refer to.

That around an axial channel 14 symmetrical from individual filter elements 33 built-up roll module 48 is in a cylindrically shaped housing 49 inserted. As the individual filter elements 33 only over the first sealing seams 34 on the inflow side 8th and the disc 43 and about the - in 11 not shown - second sealing seams 35 on the outflow side 9 with each other and the flange 45 are connected, the filter elements are able 33 a radial strain 53 executing, within the housing 49 to move. The radial strain 53 is due to the distance between the envelope 4 and the housing wall of the cylindrical housing 49 possible. The radial strain 53 Can both on the outside of the filter elements 33 as well as on the axial channel 14 facing side done. A mechanical stress on the filter belt material 2 is due to the lack of expansion in the radial direction as shown in FIG 11 locked out.

From the illustration according to 11 also shows that on the case 49 a housing flange 50 is formed, which has a seal 51 on the flange 52 of the roll module 48 is applied.

The representation according to 12 is a folding template for a rolled filter design of endless filter belt material to take. In contrast to the presentation of the folding template according to 7 , points the in 12 illustrated folding template, ie the developed course of the endless filter belt material 2 , a zigzag edge course 55 both on the inflow as on the outflow side. For the rolled filter version, cf. Roll module 48 , is due to the geometry in the valley bottom 41 a smaller space available than in the area of the back 42 the filter elements 33 , This circumstance is taken into account by the fact that the back 42 in a width b _{a is} ausgebil det, while in the region of the bottom 41 lying region of the filter belt material 2 is formed in a width b _i . This circumstance results in the zigzag edge course 55 on both edges of the endless filter belt material 2 as shown in 12 , Between the individual bottoms 41 or back 42 sidewalls extend 39 in relation to the back 42 or bottoms 41 at right angles fen.

The representation according to 13 is a folding scheme for filter elements with a shortened edge surface to remove.

The representation according to 15 is the endless filter belt material 2 in unwound form. About the side walls are the bottom or roof surfaces of the individual filter elements 33 connected to each other, with the middle in 13 shown side wall is formed as a shortened side.

Because the back 42 is on the outer diameter of the pleated filter, its back width b _a at the filter outlet is greater than the valley width b _i on the inlet side of the pleated filter. The bottom of the valley lies on the inside diameter of the folding filter according to the channel diameter 14 on. As a result, the band-shaped filter material runs 2 from which the folding filter is to be made, arcuate. For cost reasons and to circumvent the cutting or punching of gusset cutouts, the band-shaped filter material 3 as a "parallel band" without the zig-zag course 45 trained as in 8th shown. The gusset cutouts can be avoided if the mid-halves of the bottoms 41 and the back 42 run parallel. Consequently, the "entry edges" of the filter element 33 or the element cheek (side surfaces 39 Also, the right angle of the side surfaces is no longer present When folding, the longitudinal section of the filter is an element view as shown in 14 , The bottom of the valley 44 runs inclined against the flow and the entrance edges with their connections 34 as well as the outflow edges 35 stand diagonally, which avoids a restriction.

When erecting the side walls 39 in relation to the floor or roof surface 38 of the endless filter belt material 2 results in a straight filter belt, which as a folding template a zigzag course 55 both on the inflow side 8th as well as on the outflow side 9 having. Due to the in 13 illustrated configuration of the folding template of the endless filter belt material 2 arises in the presentation according to 14 lies the shortened page 56 the side wall 39 a filter element 33 in the area of the outflow side 9 while in the area of the inflow side 8th the first sealing seam 34 in the in 9a illustrated height h is formed. Due to the in 13 illustrated folding template with zigzag gradients 55 in the edge region of the endless filter belt material 2 on the inflow side 8th as well as on the outflow side 9 , is a rising bottom 57 in the lower part of the roll module 48 achieved.

The figure sequence 15a . 15b . 16a . 16b . 17 and 18 is a filter element with in and outflow associated spacers and reinforcing strips refer.

From the illustration according to 15a and 15b it turns out that a marginal strip 60 of the filter belt material 2 with a first metal strip 61.1 at a joint 62.1 can be connected cohesively. In the 15a and 15b illustrated, joined together edge strips 60 and a first metal strip 61.1 are in the illustration according to 17 on a filter element 62 shown.

In the 15b shown at the joint 62.1 interconnected components 60 and 61.1 be in the area of the inflow side 8th of the filter element 62 arranged. In the illustration according to 16a is the edge strip 60 with a second metal strip 61.2 also at a joint 62.1 cohesively connected. The joint 62.1 between the components 60 respectively. 61.2 may be designed as a welding, soldering or another cohesive connection point. How out 17 shows, is the first metal strip 61.1 (Hem band) between the side surfaces 39 the filter element on the inflow side 8th pinched. The first metal strip 61.1 (Saumband) can be folded from a solid material, such as metallic material in the case of use on a sintered metal filter substantially gap-free, which offers advantages for a subsequent weld. The side surfaces of the filter element are kept at a minimum distance from each other, so that at this entrance side, the side surfaces 39 can not be compressed to 0-distance, which would prevent the outflow of the filtered gas. In the 16a illustrated connection between the edge strip 60 and the second metal strip 61.2 is according to 18 on the outflow side 9 of the filter element 62 arranged. It follows in accordance 18 a nearly gap-free arrangement of filter elements 62 lying side by side, with the back part of each filter element 62 from the second metal strip 61.2 enclosed and thus stiffened. The first metal strip 61.1 lies as shown in 17 below the marginal strip 60 such as sintered metal belts, whereby when folding the filter element 62 on the inflow side 8th the first metal strips 61.1 close to each other. As a result, a connection can be produced in a particularly advantageous manner directly or by means such as pliers or the like, which is achieved by the gap-free positioning of the first metal strips 61.1 each other is facilitated. In terms of in 18 shown outflow side 9 the filter elements 62 It should be noted that the margins 60 covering second metal strip 61.2 are arranged above lying, so that the filter element 62 the second metal strip 61.2 as a spacer ment between the individual filter elements 62 functions and in the same way as in 17 on the inflow side 8th , on the outflow side 9 a nearly gap-free positioning of the filter elements 62 relative to each other.

The representation according to 19 is a perspective view of a finished folded filter belt material can be seen. From the in 19 illustrated finished folding 63 of the endless filter belt material 2 shows that the individual filter elements 33 are arranged continuously adjacent to each other and are configured in a pie slice shape substantially. Due to the fact that the filter belt material 2 is endless, as in 19 can represent three filter elements 33.1 . 33.2 . 33.3 be accommodated in a confined space next to each other. The side wall 39 between the filter element 33.1 and the oppositely formed thereto filter element 33.2 represents the area through which the over the inlet cross section 31 of the filter element 33.2 entering gas flow must pass to the outflow side 9 to get. From the finished folding 63 as shown in 19 also shows that the individual filter elements 33.1 . 33.2 such as 33.3 on the inflow side 8th over first sealing seams 34 cohesively connected to each other while on the filter elements 62 on the outflow side 9 second sealing seams 35 are present, which extend substantially in the vertical direction. Due to the corrugated configuration of the filter elements 33 results in a high filter element-thin packing density in a small space, since the individual filter elements 33.1 . 33.2 . 33.3 each of floor areas 38 and roof areas 38 of the endless filter belt material 2 are limited.

The representations according to the 20 and 21 views of filter elements can be removed, which are welded together on the outflow side.

In the 20 respectively. 21 illustrated filter elements 62 show in the area of her back 42 in the 18 and 20 closer described second metal strip 61.2 on. The second metal strips 61.2 can be formed so that they are the substantially triangular-shaped filter elements 62 enclose. A connection between the back area 42 the filter elements 62 enclosing second metal strip 61.2 and the endless filter belt material 2 can by a laterally extending weld 64 respectively. In the area of the valley bottom 41 the filter elements 62 they stay open. By reference 39 the sidewalls are indicated. The filter elements 62 which are circular in relation to each other about an in 21 Axial channel, not shown, can be arranged by the second metal strip 61.2 in the area of the back 42 separated from each other. From the illustration according to 21 shows that instead of in 20 illustrated laterally extending welds 64 also a frontal weld 65 the adjoining side walls 39 the individual filter elements 62 is possible. In the in 21 variant is missing in 20 illustrated second metal strip 61.2 on the back 42 of the filter element 62 , Also in the in 21 illustrated embodiment remains the area of the bottom 41 of each filter element 62 free.

Of the 22 can be seen that during the gradual folding the entry and exit edges 34 . 35 in an advantageous manner perpendicular to the surface of the side surface 39 connected and can be welded together, for example. Thus, the laser welding process is advantageously used. In 22 is the right side of the arrangement as folded and at the entrance and exit edges 34 and 35 adopted together. The extremely wide side surface 39 is bent straight down and made the valley sole fold, so that the unfolded, in band form filter band material 2 horizontally to the left. Now is an accessibility for a lateral connection technique such as by way of laser welding in the direction 64 at the inflow edge 34 given. The same applies to the trailing edge 35 , which according to the above can also be made available for a lateral connection technique such as laser welding.

The representations according to the figure sequence 23 - 25 are each in the individual filter elements embedded spacers 66 refer to.

The spacers 66 Become one with a profiling 68 provided provided with metallic material. The spacers 66 have individual punched out 69 on, with the flat areas of the spacers 66 through the bridges 67 stay connected. The profiling 68 the material from which the spacers 66 can be made, for example, can be triangular. By means of spacers 66 will prevent the filter elements 33 respectively. 62 Collapse due to the differential pressure. The spacers 66 according to the 23 - 25 For example, on the outflow side 9 into the filter elements 33 respectively. 62 be used. Also the spacers 66 can be made of a continuous material and be formed so wavy that they in the substantially triangular profile of the filter elements 33 respectively. 62 fit. Between the individual spacers 66 Be the punching 69 made the insertion of the spacers 66 allow in the pocket-shaped discharge elements. The bridges 67 make the connections over back 42 or at the bottom of the valley 41 so that a preformed spacer (see illustration according to FIG 23 ) easily into the filter element 33 respectively. 62 can be pushed into it. Rework is no longer necessary, since it is in the example fir-shaped profiled spacer 66 is a complete part, which is easy and fast on the outflow side 9 in the filter element 33 respectively. 62 can be mounted.

According to the representations 26 respectively. 27 are divided trained Roll filter modules to remove.

From the illustration according to 26 go filter elements 62 showing, where the last trainees filter elements 62 are shown. With a narrow filter element arrangement, the last filter elements 62 only be folded and positioned when the first and second sealing seams 34 respectively. 35 after the finished folding 63 getting produced. In this case, the respective front and rear edges of the filter elements 33 respectively. 62 not together, ie they must be brought into the final position and welded there.

It can be two filter module halves 71 respectively. 72 to a roll module 48 join together, with a dividing plane 70 preferably through the middle of the back 42 the last to be mounted filter elements 62 runs.

From the illustration according to 27 shows that the two filter module halves 71 respectively. 72 , which are each formed half folded ready, over outwardly projecting surface sections 73 respectively. 74 be joined together, for example, by means of the welding process. After joining the two semi-cylindrical filter module halves 71 respectively. 72 be the edges with the in the parting plane 70 lying filter elements 62 cohesively connected to each other.

With the manufacturing method outlined above for fabricating a wall flow principle filter and the filter designs derived therefrom, radial thermal expansion problems can be eliminated when the filter 1 used for soot filtration and high temperatures at the individual filter elements 33 respectively. 62 incurred during Rußabbrand. The filter elements 33 are on the outflow side 9 through a flange 45 clamped, but can freely expand radially inward, as shown in the illustration 11 evident. The same applies to the inflow side 8th at which the cap 43 and the filter elements 33 on its radially inner side in the region of the axial channel 14 are fixed, but through the space to the outer housing 49 a radially outward thermal expansion 53 allows. Due to the endless folding are the individual filter elements 33 respectively. 62 with her bottom 41 interconnected, whereby the vibration and individual deflection of the individual filter elements 33 respectively. 62 is suppressed. The endless filter belt material 2 Can be folded and processed directly without additional punching and cutting. By the final adjustment of the edge length, the most diverse shapes can be designed.

1

filter

2

Filter strip material

3

rounded top

4

envelope

5

axis

6

first covering

7

second covering

8th

inflow

9

outflow

10

wave

11

star shape

12

inflow

13

outflow

14

axial

15

free space

16

closing surface

20

medium outlet

21

first closing surface

22

second closing surface

23

housing part

24

leading edge

30

wedge-fold

31

Inlet cross-section

32

front edge

33

filter element

34

first seal weld

35

second seal weld

36

inclination

37

completion

38

Ground, top, roof

39

Side wall

40

rolled popliteal crease

41

Valley floor (bi)

42

Back (ba)

43

Frontabdeckscheibe

44

slots

45

flange

46

back end

47

inner contour

48

Roll module

49

casing

50

housing flange

51

poetry

52

flange of the module

53

radial expansion filter elements

54

Faltvorlage

55

Zigzag edge profile

56

shortened page

57

rising Valley floor

60

edge strips

61.1

first metal strips

61.2

second metal strips

62

filter element

62.1

joint

63

finished folding

64

lateral Weld

65

frontal weld

66

spacer

67

web

68

profiling

69

outs

70

parting plane

71

first Filter module half

72

second Filter module half

Claims (14)

Method for producing a filter ( 1 . 48 ) for a medium to be cleaned from an endless filter belt material ( 2 ), whereby from this filter elements ( 33 . 62 ), with the following method steps: a) generating a folding pattern ( 37 ; 38 . 39 ; 41 . 42 ) on the endless filter belt material ( 2 ), b) folding ( 63 ) adjacent to each other, mutually oppositely oriented filter elements ( 63 . 62 ) from the endless filter belt material ( 2 ) and c) producing cohesive connections ( 34 . 35 ; 64 . 65 ) between side walls ( 39 ) of the filter elements ( 33 . 62 ) on the inflow side ( 8th ) and the outflow side ( 9 ) of the filter ( 1 ). A method according to claim 1, characterized in that in the folding pattern side walls ( 39 ), a floor surface and a roof surface ( 38 ) of filter elements ( 33 . 62 ) be generated. Method according to claim 1, characterized in that after folding ( 63 ) of the filter elements ( 63 . 62 ) whose adjacent side walls ( 39 ) are sintered together, glued together or welded together. Method according to claim 1, characterized in that the adjacent filter elements ( 33 . 62 ) of a roll module ( 48 ) in the area of a valley ( 41 ) of the endless filter belt material ( 2 ) by means of a clip-on holding element ( 43 ) on the inflow side ( 8th ) and in the area of a back ( 42 ) on the outflow side ( 9 ) by means of one of the filter elements ( 33 . 62 ) overlapping flange ( 45 ) are fixed. Method according to claim 2, characterized in that on the fold pattern of the endless filter belt material ( 2 ) the side walls ( 39 ) either at right angles to the ground or roof surfaces ( 38 ) or are oriented at an angle α> 90 °. A method according to claim 1, characterized in that in the edge regions of the endless filter belt material 2 the filter elements ( 33 . 62 ) on the inflow and outflow side reinforcing strips ( 61.1 . 61.2 ). Method according to claim 6, characterized in that the reinforcing strips ( 61.1 ) on the inflow side ( 8th ) below the endless filter belt material ( 2 ) and on the outflow side ( 9 ) above the endless filter belt material ( 2 ). Method according to claims 1 and 6, characterized in that the formation of cohesive connection points ( 34 . 35 ; 64 . 65 ) takes place as all-round welds or frontal welds. Method according to claim 1, characterized in that the filter elements ( 33 . 62 ) on the outflow side by a profiling ( 68 ) provided spacers ( 66 ), which on the outflow side ( 9 ) in the filter elements ( 33 . 62 ) is inserted. Filter ( 1 ) for a to be cleaned, flowing medium prepared according to one or more of the preceding claims, characterized in that the filter as a roll module ( 48 ) is formed, the filter elements ( 33 . 62 ) via cohesive connection points ( 34 . 35 ; 64 . 65 ) on the inflow side ( 8th ) and the outflow side ( 9 ) are interconnected. Filter ( 1 ) according to claim 10, characterized in that the roll module ( 48 ) with circularly arranged filter elements ( 33 . 62 ) in a radial expansion ( 53 ) of the filter elements ( 33 . 62 ) enabling housing ( 49 ) is recorded. Filter ( 1 ) according to claim 1, characterized in that the inflow side ( 8th ) and the outflow side ( 9 ) of the roll module ( 48 ) through the endless strip material ( 2 ), the cohesive connection points ( 34 . 35 ; 64 . 65 ), the flange ( 45 ) of the roll module ( 48 ) and the flange ( 50 ) of the housing ( 49 ) are separated from each other. Filter ( 1 ) according to claim 1, characterized in that the folding and joining at the points ( 34 . 35 ) is executed step by step. Filter ( 1 ) according to claim 1, characterized in that by continuously or stepwise changing inflow edges or a change between back and bottom (bottom) non-circular folding filter in oval or elliptical Geometry are generated.