Filter element and filter system, in particular for the intake air of a combustion engine

Technical field

p0001The invention relates to a filter element, in particular for the intake air of an internal combustion engine or a compressor. Furthermore, the invention relates to a filter system.

State of the art

p0002The document <patcit id="pcit0001" dnum="WO2004020075A"><text>WO 2004/020075</text></patcit> discloses a filter system for the intake air of an Brennkraftrnaschine, a Filteralement is clamped between two housing parts, the filter element consists of a wound filter, which is formed by a coiled filter medium, and a circumferentially disposed gasket. The profile seal is formed by an elastic band which is circumferentially bonded to the filter wrapping For this purpose, the seal via a parallel to the outer circumference of the extending Filfterwickels Umfengsfläche which is adhered to the Filfterwickel. In order to ensure a good connection of the seal with the filter wrap, the seal top has a sealing foot which is wider than the sealing bead. The sealing foot extends axially along the circumferential surface of the filter coil on both sides over the seal, whereby a supernatant of the sealing foot up and down is present. Since the gasket made of an elastic material, the filter element within the housing parts oscillate axially, whereby the filter element is damaged.

p0003<patcit id="pcit0002" dnum="EP1350550A"><text>EP 1350550</text></patcit> describes a filter element having a circumferential seal with hard and Welch component. From the<patcit id="pcit0003" dnum="DE19604577"><text>DE 196 04 577</text></patcit> discloses a filter element with a front frame.

p0004Object of the invention is to provide a filter system and a filter element, a seal can be fixed easily and inexpensively on a filter body and damage is prevented by vibrations. This object is achieved through the filter element of claim 1 and the filter system of claim 8.

Disclosure of the Invention

p0005The filter element according to the invention is used for purification of a fluid stream, in particular of the intake air for an internal combustion engine or a compressor. Of course, can be used, the filter element also in other filtration applications. For this purpose, the filter element has a filter body which is formed from a filter medium. The filter medium which is suitable for the separation of contaminants from the fluid stream can be for example a folded and closed annular filter paper. However, also other configurations of the filter body, a conceivable example with a filter winding with alternately closed ducts wound filter paper, or a filter formed of a filter block foam. Around the filter body, a circumferential seal is arranged, which has a hard component and a Welch component. The hard component is composed of a dimensionally stable material, such as plastic or metal, wherein the hard component is annular, the Welch component consists of an elastic material such as an elastomer, a thermoplastic elastomer (TPE) or a PUR foam, which has a reliable seal with an adjacent housing part forms. The Welch component is connected to the hard component in such a way that a dimensionally stable, to the filter body extending seal is formed. This compound may for example be carried out together by bonding, welding or clipping in of the components. By the hard component, the seal is so stable that vibrations which may damage the filter element in the installed state can be prevented.

p0006The seal is bonded with an adhesive to the filter body. Here, the adhesive can form a large surface connection of the soft component of the filter body. According to the invention, the adhesive forms an adhesive wedge between the soft component of the sealing and the filter body. Here, the seal is pushed over the filter body, whereby forming a space between the filter body and the seal. In this gap, a liquid adhesive is metered, which, after curing, the filter body sealed with the seal connects Since the seal forms the receptacle for the glue together with the filter body, no expensive Gleßschalen are to be brought required to the adhesive in a corresponding shape. The pre-seal is a cost-effective component simply. The adhesive wedge the seal is reliably and firmly attached to the filter body, thereby slipping or loosening of the seal of the filter body is reliably prevented.

p0007According to an advantageous embodiment, the seal in the 2-component injection molding is produced. Here, the soft component is molded directly onto the hard component. By Welch the sprinkling of the component to the hard component is a non-detachable connection between the hard component and the soft component is at least in partial areas formed, whereby the gasket as a one-piece component with the Filterkörperverbindbarist. Furthermore, the seal can be produced easily and inexpensively in 2-component injection molding process.

p0008In an advantageous embodiment of the invention, the soft component of the seal has a sealing lip which, via a linear circumferential contact zone with the filter body The sealing lip is located in such sealing contact with the filter body such that the adhesive remains in the production in the intermediate space formed between the gasket and the filter body and does not flow out. By linear contact zone, the sealing lip is circumferentially sealingly against the filter body. Bumps along the filter body can be compensated since the sealing lip conforms to the filter body and also follows these deformities.

p0009In an advantageous embodiment of the invention the Klebsfoffkeil has a higher rigidity than the flexible component. Here, the soft component of a soft material is manufactured having optimum sealing characteristics in the housing. The adhesive wedge which z. B. from a hot glue, Gleßharz, PU hard silicone or epoxy resin, is the effect that the seal has a high stability. Because the filter body can to that fixed in the housing seal execute no relative axial movements, the mechanical stresses for the filter element in the filter housing are considerably reduced.

p0010In a particular embodiment of the invention, the seal has a circumferential sealing bead. The sealing bead may have z. B. a rectangular round or oval cross section, it being understood that any arbitrary geometries can be realized. The sealing bead is designed such that it can be clamped between two housing halves, creating a reliable seal a crude side to the clean side. The adhesive flows into a gap between the sealing bead and the filter body. This has the, then to be joined by the adhesive wedge Klebar formed upper corresponding radii or arcs around the sealing bead with the filter body. The sealing bead can be either exclusively formed by the soft component or the soft component and the hard component. This has the. Welch component top a sealing portion which is deformable by a housing part. In this sealing area forming the sealing takes place, so that no uncleaned flow to the clean side of the filter element can pass.

p0011In a further embodiment of the invention, the Welch component has an attenuation range, which corresponds on the one hand with the hard component and the other with the housing geometry. This attenuation range, the material of the soft component is compressed and causes so that vibrations of the housing are transmitted only attenuated to the filter element. Thus, reducing the transmitted to the filter element vibration, whereby the filter element is relieved.

p0012It is advantageous that the soft component top has a cavity. The cavity on the one hand reduces the required geometry to form the mass of material and on the other hand cavity changes the pressure characteristics of the seal. The reduced mass Materiel both cycle times shortened, and component weight can be saved. The altered pressure characteristics of the seal can be formed with the same material, a sealant and baffle region, the material in the region of the sealing portion is more easily deformable than the attenuation range. The cavity may be preferably produced by gas or water injection method. These methods are easy to control, which seals can be produced with constant sealing properties in Serientertigung.

p0013In a particular embodiment of the invention, the hard component has at her, the soft component side facing away from a structure with elevations and depressions. This structure corresponds to a negative structure in the housing. Thus, the filter element can only be mounted in a predetermined position in the housing. An error insertion of the filter element in the housing is prevented. Furthermore, the filter element in the mounted state can not execute radial movements whereby damage is prevented by scuffing on the housing.

p0014The filter system according to the invention of claim 8 is provided in particular for purifying the intake air of an internal combustion engine, of course, other gas flows of contamination can be cleaned with this filter system. the filter system has at least top, a filter housing and a filter element. The filter housing has a top inlet through which the zureinigende air can flow into the filter housing, and a Auslase through which the cleaned air can flow out of the filter housing. The filter housing comprises at least two housing parts between which the filter element is arranged. The filter element is sealingly connected to at least one of the housing parts, said sealing connection is formed by means disposed on the filter element seal. The seal has a hard component and a Welch component, wherein the hard component corresponds to one of the housing parts and the Welch component contacted by the other housing part. This, with the hard component corresponding housing part enclosing the filter element in the axial direction at least partially. By the contact of the hard component with the housing part, there can be no relative movement between the filter element and said housing part. Thus, a scouring of the filter element in this housing part and thus the filter element damage prevented.

p0015In a further development of the filter system according to the invention which has the Welch component corresponding casing top a circumferential projection, which corresponds with the sealing component Welch. This nose is pressed during assembly of the filter element in the soft component, whereby the surface of the component Welch hugs the nose and creates a seal. The nose can have any cross section, for example triangular, sinusoidal or trapezoidal, are equipped. Preferably, the nose has a, with increasing distance from the body portion, the tapered cross-section. Thus, the nose contacts the soft component as the first with a very small area. With increasing penetration of the nose in the soft component increases the cross-sectional area of ​​the nose. In the nose there is a greater deformation of the soft component, as in the adjacent areas of the nose. Thus, around the nose, a reliable seal is generated, required to produce the sealing force is low.

p0016In one advantageous embodiment, the features of the hard component corresponding housing part on a geometry with elevations and / or depressions. The hard component also has elevations and / or depressions, said elevations of the housing part in the wells of the hard component and the ridges of the hard component in recesses in the housing part engage. The geometries correspond to one another such that the insertion of the wrong filter element or the wrong inserting a filter element is prevented. Here, then, the filter housing can not be closed and the fault can be recognized. This prevents that the filter system is operated with a defective or incorrectly installed filter element and damage to the internal combustion engine are generated. Only when an appropriate filter element is inserted in the predetermined orientation, the housing can be closed, and damage to the internal combustion engine can be prevented by deficient purified air.

Brief Description of Drawings

p0017The invention will now be described with reference to schematic embodiments. In the drawing:

p0018<figref idrefs="f0001">figure 1</figref> a filter system in a partially cut-away view,

p0019<figref idrefs="f0002">figure 2</figref> a detail of a filter system in the section,

p0020<figref idrefs="f0003">figure 3</figref> an enlarged detail according to <figref idrefs="f0002">figure 2</figref>.

p0021<figref idrefs="f0004">figure 4</figref> a section with an alternative embodiment,

p0022<figref idrefs="f0004">figure 5</figref> a section with a further alternative,

p0023<figref idrefs="f0005">figure 6</figref> a section with a further alternative,

p0024<figref idrefs="f0005">figure 7</figref> a section with a further alternative,

p0025<figref idrefs="f0006">figure 8</figref> a top view of the hard component and

p0026<figref idrefs="f0006">figure 9</figref> a detail of a seal with key-lock connection.

Embodiment (s) of the invention

p0027In <figref idrefs="f0001">figure 1</figref> is shown with a partial section in the bottom half of a filter system in the main view. The filter system has a housing 10 with a lid 11 and an oval filter element 12th The cover 11 is designed such that it closes the housing 10, the housing 10 forms a filter housing together with the lid eleventh The filter cartridge 12 has a filter coil 13 with alternately closed ducts 14 and a seal 15. The seal 15 is between the lid 11 and the housing 10 is arranged. The configuration and arrangement of the seal 15 will be described with reference to the following figures.

p0028The lid 11 has an inlet 16 through which the air to be purified can flow into the filter housing. The outlet 17 for the cleaned air is arranged in the housing 10th The filter insert 12 is arranged in the filter housing, that the inlet 16 is sealingly separated from the outlet 17, wherein the filter insert 12 extends in the axial direction in the housing 10th On the housing 10, which is formed in two parts in this embodiment, mounting tabs 18 are provided, with which the housing 10 is fixed in its installation space. The two-part construction of the housing 10 that is produced easily and inexpensively in a plastic injection molding process. The two housing parts are sealingly connected with one another in a connection region 19, which compound is produced by welding or gluing in the area. Inside the housing 10, the filter cartridge 12 is supported on a shoulder 20 which is arranged in the vicinity of the connecting portion 19 decreases. By the subsequently described configuration of the seal 15 prevents the filter cartridge 12 performs relative movement to the housing 10th This chafing be prevented on the filter insert 12th

p0029The air to be purified flows through the inlet 16 into the, through the lid 11 and the housing 10 is formed, the filter housing. The dirty air enters the arrow 21 a the open channels 14 of the filter insert 12th When crossing (arrow 22) of the air in the adjacent channels 14 which are open toward the outlet 17, the impurities are retained. From these, in the direction of the outlet 17 open channels 14, the purified air flows out in the direction of arrow 23 and passes through the outlet 17 from the filter housing.

p0030In <figref idrefs="f0002">figure 2</figref> is cut-out of the filter system according to <figref idrefs="f0001">figure 1</figref> shown in section. Of the<figref idrefs="f0001">figure 1</figref> corresponding components are provided with the same reference numerals. Of the two-part housing 10, only the part is shown, which surrounds the filter insert 12th The other part of the housing 10, to which the outlet 17 is disposed, is not shown. The filter coil 13, which is formed by a filter medium with alternately closed ducts 14 is spirally wound around a sword 24th The sword 24 is sealed and permanently connected to the plugwrap. 13 At the, the inlet 16 to the side facing the sword 24 a removal handle 25 is located. With the removal handle 25 of the filter cartridge 12 can be pulled 11 after removal of the lid from the housing 10th

p0031The seal 15 of the filter insert 12 has a ring-shaped hard component 26 and a component 26 connected to the hard-soft component 27. The component 27 has a soft sealing lip 29 which wrap the filter 13 contacted linearly. The sealing lip 29 surrounds the periphery of the filter cover 13 partly, being between the sealing lip 29 and the filter wrap 13, a gap 30 is formed, into which a glue 31 is metered. The adhesive 31 connects the soft component 27 with the filter wrap 13. The composite of the soft component 27 with the hard component 26 and the adhesive 31 is a solid bond with the filter coil 13 generates, the filter coil 13 no axial Relativberegungen to that of hard and soft component 26, 27 formed seal 15 can execute.

p0032The hard component 26 contacts the oval shaped portion of the housing 10 in the region of a seal support 28. Since both the hard component 26, and the seal bearing 28 of the housing 10 is substantially inflexible, the filter element 12 can not perform a movement relative to the housing 10th

p0033<figref idrefs="f0003">figure 3</figref> shows an enlarged section A of <figref idrefs="f0002">figure 2</figref>, Of the<figref idrefs="f0002">figure 2</figref> corresponding components are provided with the same reference numerals. The hard component 26 has a support portion 32 which the seal lip 29 of the flexible component 27 is supported in such a way that they do not stand out in the metering of the adhesive 31 of the filter wrap. 13 In addition, the seal 15 is such stiffened that vibrations between the outer periphery of the seal 15 and the filter wrap 13 can be prevented. Further, the hard component 26 has an annular peripheral support bead 33 which rests on the seal seat 28 of the housing 10th At the seal land 28 a also annular peripheral bead is also 34, on which the hard component supports 26th Thus, the hard component 26 has two support points on the housing 10, which are formed linearly and have a ring-area.

p0034The soft component 27, which is vulcanized to the hard component 26, still has in addition to the sealing lip 29 on a U-shaped sealing area 35. The U-shape is open toward the outer periphery. An edge of the U-shape is fixed to the hard component 26th The opposite edge 36 contacts the lid 11, the lid 11 has a circumferential projection 37, which is pressed into the edge 36 of the soft component 27 and as a seal between the filter element 12 and the cover 11 of the filter housing causes.

p0035In <figref idrefs="f0004">figure 4</figref> is an alternative embodiment to that shown in <figref idrefs="f0003">figure 3</figref> shown seal 15 shown. Of the<figref idrefs="f0003">figure 3</figref> corresponding components are provided with the same reference numerals. The difference from the in<figref idrefs="f0003">figure 3</figref> shown seal 15 consists in the geometry of the soft component 27. In this embodiment, the soft component has 27 also has a U-shaped geometry, wherein the U-shape is open in the direction of the hard component 26th The radially inner edge 36a of the U-shape passes into the sealing lip 29, the connection between the support portion 32 and the sealing lip 29 is formed. The radially outer edge 36b is designed thickened. By placing the lid 11 to the housing 10, a pressing of the outer edge occurs 36b. In this compressed area a damping region 38 is formed between the seal 15 and the cover 11th Thus, less vibration of the cover 11 on the filter element 12 and the housing 10 are transmitted.

p0036The, the flanks 36a, 36b connecting side of the U-shape forms in this embodiment the sealing portion 35 'between the soft component 27 and the cover 11th

p0037In <figref idrefs="f0004">figure 5</figref> is a further alternative embodiment to the in <figref idrefs="f0003">figure 3</figref> and <figref idrefs="f0004">4</figref> illustrated gaskets 15 shown. The<figref idrefs="f0003">figures 3</figref> or <figref idrefs="f0004">4</figref> corresponding components are provided with the same reference numerals. The difference from the in<figref idrefs="f0003">figure 3</figref> shown sealing 15 is the geometry of the soft component 27 and the cover 11. The soft component 27 has in addition to the sealing lip 29 which abuts the filter coil 13, via another circumferential lip-shaped sealing geometry 39. The associated with the hard component 26 sealing lip 29 goes directly into the sealing geometry 39 on. The sealing geometry 39 seals against when mounted on the nose 37th Furthermore, the soft component has 27 via a Dämpfungsfuß 40, which is connected by a rectangular annular cross-section fixed to the hard component 26th Between the Dämpfungsfuß 40 and an integrally formed on the lid 11, paragraph 41, a damping portion 38 is in accordance with<figref idrefs="f0004">figure 4</figref> formed as the Dämpfungsfuß 40 is compressed during the mounting of the lid eleventh

p0038In <figref idrefs="f0005">figure 6</figref> is an alternative embodiment to the in <figref idrefs="f0003 f0004">Figure 3 to 5</figref> illustrated gaskets 15 shown. Of the<figref idrefs="f0003">figure 3</figref> corresponding components are provided with the same reference numerals. The difference from the in<figref idrefs="f0003">figure 3</figref> shown seal 15 consists in the geometry of the soft and hard components 27, 26. The hard component 26 is formed in this embodiment as a flat ring with a molded support portion 32nd The soft component 27 has a cavity 42 which is produced in the internal gas pressure process. Through the cavity 42, the wall thickness of the soft component 27 is formed such that the center of the cavity 42 is formed with a sealing region of the nose 35th In the radially outer portion of the soft component 27, a damping portion 38 is formed, which is achieved by a pressing of the soft-component material between the cover 11 and the hard component 26th

p0039In <figref idrefs="f0005">figure 7</figref> is an alternative embodiment to the <figref idrefs="f0003 f0004 f0005">Figures 3 to 6</figref> illustrated gaskets 15 shown. The<figref idrefs="f0003 f0004 f0005">Figures 3 to 6</figref> corresponding components are provided with the same reference numerals. The difference in de<figref idrefs="f0003">figure 3</figref> shown seal 15 consists in the geometry of the soft component 27 and the hard component 26. Further features of the lid 11 via a shoulder 41 in accordance with <figref idrefs="f0004">figure 5</figref>, The hard component 26 has next to, integrally formed on the annular portion supporting portion 32 still has a boss 43 which projects towards the soft component 27th The soft component 27 has, apart from the protruding into it approach 43 on a rectangular cross-section with molded sealing lip 29. As the material of the soft component 27 is very flexible is easily the material through the nose 37 compress, whereby the sealing region 35 is formed. The material of the soft component 27, which is arranged between the shoulder 41 of the lid 11 and the extension 43 of the hard component 26 is so compressed that a damping region 38 is formed. Thus, the sealing region 35 is functionally and geometrically separated from the damping portion 38 also in this embodiment.

p0040In <figref idrefs="f0006">figure 8</figref> is a plan view displayed on the hard component 26, this being the, is connected to the housing 10 corresponding page. The circular shape illustrated is divided into four different sectors with various embodiments. Instead of a circular shape, the hard component 26 also have an oval or elliptical shape.

p0041In the upper left of the hard component 26 is designed such that the plane annular portion comprises bores 44th In these bores 44 pins (not shown), which are arranged on the corresponding housing 10, engage. By the engagement of the pins in the holes 44 of the filter cartridge 12 is in the housing 10 according to the<figref idrefs="f0001">figures 1</figref> and <figref idrefs="f0002">2</figref> secured against radial movements. The size and number of holes 44 is arbitrary. In addition, the distribution of the holes on the circumference is arbitrary. In a single hole 44 and a single pin of the filter element 12 can be mounted only in a single position. If a plurality of bores 44 are provided in the hard component 26, however, only one pin is provided in the housing 10, corresponding to the number of mounting positions of the filter cartridge 12 to the number of the holes 44. If there are several bores 44 and a plurality of pins may be those arranged at regular intervals whereby several mounting positions are provided. There, the distances between the holes and the pins are also chosen so that only specific installation are possible.

p0042Instead of the bores 44, as illustrated in the upper portion and rectangular rake increases 45 and recesses 46 be provided based on a circular ring surface 50, which are alternately arranged. The elevations 45 protrude beyond the annular surface 50 axially upward and the recesses 46 form a step down. The number and arrangement of the elevations 45 and depressions 46 may be any according to the designs to the holes 44th

p0043In the lower right area, the increases are arranged 45 triangular shaped and uniformly distributed over the circumference.

p0044At the bottom left, the elevations 45 in the outer circumferential area and the depressions 46 are arranged in the inner circumferential region, the distances between the ridges 45 to one another or between the recesses 46 are equal to each.

p0045In <figref idrefs="f0006">figure 9</figref> 15 with a key-lock connecting a section of the seal. The configuration of the soft component 27 corresponds to the in<figref idrefs="f0005">figure 6</figref> embodiment shown, the lid 11 is not shown. The seal seat 28 of the housing 10 has the corresponding negative geometry of the elevations 45 and depressions 46 of the hard component 26. Thus, projecting parts of the sealing liner 28 in the recesses 46 of the hard component 26 inside. Increases 45 the hard component 26 project into recesses of the seal pad 28th Thus, a key-lock connection between the housing 10 and the filter element 12 is formed, which prevents erroneous insertion of the filter insert 12th