DE102016002954A1 - Filter system and filter element for a filter system - Google Patents

Abstract

The invention relates to a filter element (10) comprising a closed filter body (12) elongated along a longitudinal axis (L) and a closed end disk (20) fixedly connected thereto, with which the filter body (12) is tightly connected to its end face (50) wherein the end plate (20) has a fixing position (32) for an axially outwardly projecting support structure (40), wherein the fixing position (32) is arranged in a bulge (30) of the end plate (20) and related to the fixing position (32) is extended to a radial position within an outer side of the filter body (12) and axially of the end face (50) of the filter body (12) to the outside and extends the bulge (30) defined by an inside of the filter body (12) space. The invention further relates to a filter system (100) with a replaceable filter element (10).

Description

Technical area

The invention relates to a filter system, in particular for use as an air filter of an internal combustion engine, and a filter element for installation in such a filter system.

State of the art

From the WO 2009/047196 A1 is a filter system for internal combustion engines with a filter element known. This filter system is used in particular for filtering the intake air of an internal combustion engine and consists of a housing and a lid for receiving the filter element, which is ensured by the design of the seals of the filter element with two ring-shaped arrangements and an intermediate sealing groove, on the one hand a sealing effect and on the other hand an axial support of the filter element is achieved in a housing. Especially with the use of plastic for sealing vibration-loaded elements a design is required, which works reliably even with extreme temperature fluctuations.

Basically, it is provided to replace the filter elements of air filters after a certain period of operation. Depending on the amount of dust, the service life of an air filter can be a few days (construction machinery) up to several months. In this case, usually the secondary filter element, which is arranged on the clean air side, remains in the filter system. However, if the secondary filter element heavily loaded with dirt, so it must also be replaced, otherwise the air flow is reduced too much. The reliable and process-reliable sealing of the filter element and the secondary filter element in a housing is particularly important in order to protect the intake tract of a subsequent internal combustion engine from penetrating dirt.

Depending on the intended use of the filter system, it may be advantageous to provide only a primary filter element or additionally a secondary filter element.

Disclosure of the invention

An object of the invention is to provide a filter element which can be used in a filter system optionally with or without a secondary filter element which allows a reliable seal between the unfiltered and the filtered media region and a stable mounting position in a housing of a filter system allows.

Another object of the invention is to provide a filter system with such a filter element.

The above objects are achieved according to one aspect of the invention in a filter element and according to another aspect in a filter system with a replaceable filter element, wherein the filter body is connected with its end face tightly connected to a particular closed end plate, wherein the end plate has a fixing position for an axial has outwardly projecting support structure, wherein the fixing position is arranged in a recess of the end plate and the fixing position relative to a radial position within an outer side of the filter body and arranged axially upstream of the end face of the filter body to the outside and wherein the bulge through an inside of the filter body extended space.

Favorable embodiments and advantages of the invention will become apparent from the further claims, the description and the drawings.

It is proposed a filter element, comprising an elongated along a longitudinal axis, annular closed filter body and a fixed end plate fixed thereto, with the filter body is sealed to its front side, wherein the end plate has a fixing position for an axially outwardly projecting support structure, said the fixing position is arranged in a bulge of the end disk and the fixing position is arranged upstream relative to a radial position within an outer skin of the filter body and axially upstream of the end face of the filter body and wherein the bulge extends a defined by an inner side of the filter body space.

Characterized in that the space defined by an inner side of the filter body is extended by the bulge, the thus extended space projects beyond the end face of the filter body of the filter element and preferably beyond the outer edge of the end plate. Thus, a possible secondary element may be longer and / or the space necessary for a possible handle arranged on the secondary element can be created.

Advantageously, the end plate can support both a sealing function of the filter body as well as a support function by axial bracing of the filter element in a housing by means of the support structure. The support structure allows a safe introduction of force from a housing cover in the end plate. Due to the spatially separated sealing and support areas a flexible space-oriented filter element construction is possible.

Due to the arrangement of the sealing area and supporting structure, the surfaces of the sealing area and the supporting structure can be located axially at different levels, which is not possible with a continuous foamed polyurethane end plate. The sealing region is formed in particular by an adhesive region in the form of a sealing adhesive bond. By virtue of the fact that the surfaces of the foamed volumes can be arranged at different levels, in particular the inner surface of the support structure can be axially further away from the air outlet than the surface of the bond area or the front side of the filter body.

The support structure may have, in particular, outwardly projecting support studs which, when installed in a housing, permit stable and vibration-resistant clamping in the axial direction in the housing. In this way, the filter element via the closed end plate is axially clamped against the cover and thus against the housing and thereby experiences a fixed bearing on the front side, the cover-side end of the filter element.

Advantageously, the closed end plate may be formed as a molded part made of a solid plastic, for example by means of injection molding. Alternatively, the end plate as a two-component end plate with a hard injection molded part and an elastic member, for. As polyurethane or a thermoplastic elastomer may be formed.

At the opposite side of the closed end disc of the filter body may be provided an open end plate, which is in particular made of polyurethane and which allows a radial sealing of the filter body. Expediently, support studs projecting therefrom in the axial direction can also be provided there.

Advantageously, the open end plate may have a radial seal with respect to a housing. This has the advantage that in addition to a good seal and thus a secure filter effect, a radial guidance of the filter element in the housing can be effected by the radial seal and the axial clamping of the support studs in the lid and thus a very stable mounting of the filter element is formed in the housing.

The filter body may for example consist of a star-folded filter bellows, which is designed to be closed annular. The folding can be produced for example by knife folding, for longer filter body, or rotational folding. The filter bellows may for example consist of paper or cellulose or of a mixed fiber of plastic and cellulose. The filter bellows can also be designed with a smooth surface, rolled and / or designed in various embossing molds shaped surface for stiffening and / or creation of cavities for dust deposition. The filter bellows may have a coating and / or impregnation to repel moisture. It may alternatively be coated with nanofibers. The filter body may further be structurally stiffened with a filament winding. Also conceivable is a wound filter body with one or more layers.

According to a favorable embodiment, the bulge can have passage openings in the axial direction. In particular, the passage openings can be penetrated by the support structure. The support structure can pass through the through openings in a form-fitting manner and thus form a particularly stable connection with the end disk.

According to a favorable embodiment, the support structure may be formed of an elastomer, in particular polyurethane. Polyurethane foam can easily penetrate through holes in the manufacture of the support structure.

According to a favorable embodiment of the filter body can be foamed on the end plate on its front side with an elastomer, in particular polyurethane. Then, the support structure can be made with the sealing adhesive bond on the filter body in a common casting shell. Alternatively, the filter body may be glued to the end plate on its front side with an adhesive. Alternatively, the filter body may be welded to the end plate on its front side. It is a flexible and needs-based production of the filter element possible.

According to a favorable embodiment of the filter body may be conically shaped and at the closed end plate having a larger outer diameter than on its opposite end face. This allows a favorable flow distribution along the filter body.

According to a favorable embodiment, the bulge may be formed as a hollow cylinder. This provides space to mount a secondary filter element within the filter element, particularly within a center tube that can engage the recess.

According to a favorable embodiment, the bulge can be designed to receive a secondary filter element. In particular, a support region for the secondary filter element can be provided in the bulge of the end plate. The filter element and the secondary Filter element can be changed independently.

According to a favorable embodiment, the bulge can be arranged within a clear width of the filter body. It may be provided a central tube which engages in the bulge and in which a secondary filter element may be arranged. The end plate can advantageously also have an insertion bevel in the region in which the center tube engages, which centers the filter element during assembly on the center tube. In one embodiment, the axially inner boundary surface of the support structure may rest against the central tube, so that the support structure between the housing cover and center tube can be clamped, so that no or less axial clamping force is transmitted via the filter bellows in the direction of another end plate.

According to a further aspect of the invention, a filter system is proposed, comprising a housing with a longitudinal axis, a cover which closes the housing at one end face, an inlet nozzle arranged on the housing for supplying a medium to be filtered and an outlet nozzle arranged at the housing for discharging the filtered one Medium, as well as an exchangeable filter element having a longitudinal axis along an elongated, annularly closed filter body and a fixed end plate fixed thereto, with which the filter body is tightly connected to its front side, wherein the end plate has a fixing position for an axially outwardly projecting support structure wherein the fixing position is arranged in a recess of the end plate and arrange the fixing position in relation to a radial position within an outer skin of the filter body and axially upstream of the front side of the filter body to the outside t, and wherein the protrusion extends a space defined by an inside of the filter body.

Characterized in that the space defined by an inner side of the filter body is extended by the bulge, the thus extended space projects beyond the end face of the filter body of the filter element and preferably beyond the outer edge of the end plate. Thus, a possible secondary element may be longer and / or the space necessary for a possible handle arranged on the secondary element can be created.

According to a favorable embodiment, a housing-fixed central tube can be provided. This can be locked on the housing.

At the opposite end of the closed end of the filter body, an open end plate may be provided, which may be formed in particular of polyurethane and which allows a radial sealing of the filter body. Appropriately, there may be provided in the axial direction projecting support knobs.

The closed end disk can have supporting knobs for axial and / or radial force transmission between the cover and the second end disk. In this way, the force exerted on the closing of the lid force can be passed through the end plate through this and introduced into the central tube, resulting in a fixed mounting of the filter element. In particular, in this case the end disk can also have an insertion bevel in the region in which the center pipe engages, which centers the filter element on the center pipe during assembly. Optionally, the axially inner boundary surface of the support structure abut the central tube, so that the support structure between the housing cover and center tube can be clamped, so that no or less axial clamping force is transmitted via the filter bellows in the direction of the opposite open end plate.

Advantageously, the closed end disk can also have supporting knobs for the axial and / or radial force transmission between the cover and a secondary filter element arranged inside the filter element. In this way, the force exerted on the closing of the cover force can be passed through the end plate and introduced into the secondary filter element, which in turn can be pressed firmly into its housing seat. For a solid storage of the secondary filter element and at the same time good sealing between the unfiltered and filtered area of the filter system is possible.

The sealing region of the open end disk of one or both filter elements toward the housing is designed in a preferred embodiment as in FIG WO 2012/172019 A1 or US 2014/0102058 A1 described. The contents of both applications are hereby expressly referred to and their disclosure fully included in this application.

It is advantageous to use a filter system as an air filter, in particular as an air filter in compressors, agricultural machinery or other devices with internal combustion engines.

Brief description of the drawings

Further advantages emerge from the following description of the drawing. In the drawings, embodiments of the invention are shown. The drawings, the description and the claims contain numerous features in combination. The skilled person will become the characteristics expediently consider individually and summarize meaningful further combinations.

They show by way of example:

1 a perspective view of a filter system according to an embodiment of the invention with radially arranged inlet nozzle and centric outlet nozzle according to an embodiment of the invention;

2 as a quarter section, a perspective view of a filter element according to an embodiment of the invention;

3 a detail of the filter element 2 without supporting structure at the end disk and sealing area in the form of a sealing adhesive area on the filter element;

4 a longitudinal section through a filter system with primary filter element and secondary filter element according to an embodiment of the invention; and

5 as a sectional view of a detail of the filter system 4 ,

Embodiments of the invention

In the figures, the same or similar components are numbered with the same reference numerals. The figures are merely examples and are not intended to be limiting.

1 shows a perspective view of a filter system 100 according to an embodiment of the invention with radially arranged inlet nozzle 102 and centric outlet 104 , Shown is a round filter design, consisting of a housing 108 consists of a front with a lid 110 is closed. In the case of an air filter system, dust-laden air flows into the inlet port 102 , the z. B. is arranged radially to the inside built-air filter element. The purified air can be removed via the centric outlet 104 out of the case 108 be dissipated.

The inlet nozzle 104 can with his covenant 106 in any angular position to the previously perforated housing 108 be welded.

The 2 and 3 show as quarter section a perspective view of a filter element 10 according to an embodiment of the invention, wherein 3 a detail of the filter element 10 out 2 omitting the supporting structure 40 and sealing area in the form of a sealing adhesive bond 52 shows.

2 shows the filter element 10 comprising a closed filter body elongated along a longitudinal axis L. 12 as well as a permanently connected closed end disk 20 includes. The filter body 12 is with his front page 50 at the closed end disc 20 tightly connected. The front side engages 50 of the filter body 12 in a radially outer groove between a downwardly bent edge 38 the end plate 20 and a radially inner collar 26 the end plate 20 one. On the filter body 12 is the sealing glue joint 52 arranged by z. B. Polyurethane as a sealant and adhesive fills the groove, the front page 50 partially interspersed and these tight and firm with the end disc 20 combines. Alternatively, the connection can be made by means of an adhesive or by welding the filter body 12 with the end disc 20 be prepared. In the groove is a small bead 36 arranged, the front side 50 spaced from the groove bottom, so that a sufficient amount of sealant between the front side 50 and groove bottom can get.

The closed end disc 20 has a fixing position 32 for an axially outwardly projecting support structure 40 on, with the fixing position 32 in a bulge 30 the end plate 20 the front side 50 of the filter body 12 is arranged upstream of axially outside. Relative to a radial position is the bulge 30 within an outer skin of the filter body 12 and in particular within the inner diameter of the filter body 12 positioned. As in 3 can be seen, points to the bulge 30 at the fixing position 32 Through openings 34 on. This allows the support structure 40 positive fit with the end plate 20 be connected by the support material through the through holes 34 reaches through, for. As polyurethane (also referred to as PUR) in the preparation of the support structure 40 the passageways 34 foamed. This results in a solid, positive connection between PUR and the molding (end plate 20 ), and both PUR areas can be made from the same side, ie the liquid polyurethane can be metered from the same side.

The passage openings 34 form a groove bottom of an axially inner groove between the inner collar 26 and a radially inner collar 28 , The Bund 26 points in the region of the groove with the through holes 34 a small paragraph 27 on, so that the support material, eg. As polyurethane, in addition, can anchor in the groove stable. On the other hand, the passage openings form 34 the groove bottom of an axially outer groove between a collar 22 and a covenant 24 , The support structure 40 has axially outwardly projecting support nubs 44 on.

By this arrangement of sealing area - in the form of a sealing adhesive bond 52 (please refer 2 , in 3 not shown for clarity) and supporting structure 40 may be the axially upper surface of the sealing adhesive bond 52 and the axially lower surface 42 the support structure 40 axially on different levels, which is not possible with a continuous foamed polyurethane end plate. Characterized in that the surfaces of the foamed volume of sealing area and supporting structure 40 can be arranged on different levels, in particular the axially lower surface of the support structure can be axially further away from the air outlet than the axially upper surface of the bond area or the end face of the filter body.

The support nubs 44 the closed end disc 20 , which are arranged radially outwardly extending circularly about the longitudinal axis L, can in an installation of the filter element 10 in the case 108 ( 1 ) on an inner lid contour of the lid 110 fitting to the housing 108 support axially.

At the opposite end 60 of the filter body 12 is an open annular end plate 70 arranged, which causes a radial seal in the installed state and with Stütznoppen 72 is provided, which is axially from the filter body 12 protrude. The open end disc 70 is advantageously made of polyurethane, which is attached to the front 60 is foamed.

The filter body 12 For example, it may consist of a zigzag-folded (pleated) filter bellows and be of annular design. The folding can, for example, by knife folding, for longer filter body 12 , or rotational folding are produced. The filter bellows may for example consist of paper, cellulose or a mixed fiber of plastic and cellulose and smooth surface, rolled and / or be designed in various embossing molds shaped surface for stiffening and / or creation of cavities for dust deposition. The filter bellows may have a coating and / or impregnation to repel moisture. It may alternatively be coated with nanofibers. The filter body 12 may continue to be structurally stiffened, for. B. with a continuous strip of hot melt adhesive, a wound adhesive strip, a so-called thread winding in the form of a hot-melt impregnated thread, tape, or the like.

Through the bulge 30 the closed end disc 20 is inside the filter element 10 created a free space, which makes it possible within the filter element 10 If necessary, to provide a central tube, which axially over the filter body 12 protrudes. Optionally, additionally or alternatively, if required, a secondary filter element can be provided, which axially over the filter element 10 also available. Middle tube and secondary filter element can thereby independent of the sealing structure of the filter element 10 to be ordered.

4 shows a sectional view through a filter system 100 with primary filter element 10 and secondary filter element 80 as well as with a center tube 90 according to an embodiment of the invention. 5 shows a sectional view of a detail of the filter system 100 out 4 ,

The filter system 100 has a radially arranged inlet nozzle 102 and a central outlet 104 in a housing 108 on. The housing 108 is on a front side with a lid 110 locked. In the case of an air filter system, dust-laden air flows into the inlet port 102 , the z. B. radially to the internally installed filter element 10 is arranged. The purified air can be removed via the centric outlet 104 out of the case 108 be dissipated. The inlet nozzle 104 can with his covenant 106 in any angular position to the previously perforated housing 108 be welded. The filter system 100 can be used as an air filter z. B. used in construction machinery, agricultural machinery, compressors and other devices with internal combustion engine.

In the case 108 is a filter element 10 arranged concentrically a central tube 90 and a secondary filter element 80 surrounds. The optional center tube 90 is fixed to the housing and at the outlet end of the housing with the housing 108 snapped. The filter body 12 may be conical in shape and have a larger outer diameter at the closed end plate than on its opposite end face 60 , The end disc 20 points inside in the area where the center tube 90 engages, an insertion bevel, which is the filter element 10 when mounting on the center tube 90 centered.

The embodiment of the filter element 10 with end disc 20 as well as supporting structure 40 is in the 2 and 3 described, which is referred to. The center tube 90 and the secondary filter element 80 protrude into the bulge 30 the closed end disc 20 into and protrude axially over the filter element 10 out.

The secondary filter element 80 consists essentially of a support tube 82 as a supporting structure and a relatively permeable filter medium arranged thereon 84 , for example a fleece. The secondary filter element 80 can when replacing the filter element 10 in the case 108 to protect the further air flow, For example, an internal combustion engine, remain against penetrating dust particles and other objects. The secondary filter element 80 is with its open end in a housing seat on the outlet side of the housing 108 plugged. The closed end 86 of the secondary filter element 80 lies in the bulge 30 the closed end disc 20 of the filter element 10 which, when closing the housing cover 110 a force on the Stütznoppen 44 the end plate 20 in the closed end of the secondary filter element 80 can be routed and the secondary filter element 80 firmly in its housing seat on the outlet 104 is pressed. To the closed end 86 closes a handle 88 on, the removal of the secondary filter element 80 facilitated.

This is the filter element 10 in addition to the center tube 90 over the closed end disc 20 axially against the lid 110 and thus against the case 108 clamped and thus experiences a fixed bearing on the front side 50 , the lid-side end of the filter element 10 ,

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• WO 2009/047196 A1 [0002]
• WO 2012/172019 A1 [0031]
• US 2014/0102058 A1 [0031]

Claims (15)

Filter element ( 10 ) comprising a closed filter body elongated along a longitudinal axis (L) ( 12 ) as well as a permanently connected closed end disk ( 20 ), with which the filter body ( 12 ) with its front side ( 50 ) is tightly connected, wherein the end plate ( 20 ) a fixing position ( 32 ) for an axially outwardly projecting support structure ( 40 ), wherein the fixing position ( 32 ) in a bulge ( 30 ) of the end plate ( 20 ) is arranged and the fixing position ( 32 ) relative to a radial position within an outer skin of the filter body ( 12 ) and axially the end face ( 50 ) of the filter body ( 12 ) is outwardly upstream and the bulge ( 30 ) one through an inside of the filter body ( 12 ) extended space. Filter element according to claim 1, wherein the bulge ( 30 ) in the axial direction passage openings ( 34 ) having. Filter element according to claim 2, wherein the passage openings ( 34 ) of the support structure ( 40 ) are interspersed. Filter element according to one of the preceding claims, wherein the support structure ( 40 ) is formed from an elastomer, in particular polyurethane. Filter element according to one of claims 1 to 4, wherein the filter body ( 12 ) at the end plate ( 20 ) on its front side ( 50 ) is foamed with an elastomer, in particular polyurethane. Filter element according to one of claims 1 to 4, wherein the filter body ( 12 ) with the end plate ( 20 ) on its front side ( 50 ) is glued with an adhesive. Filter element according to one of claims 1 to 4, wherein the filter body ( 12 ) with the end plate ( 20 ) on its front side ( 50 ) is welded. Filter element according to one of the preceding claims, wherein the filter body ( 12 ) is formed star-folded. Filter element according to one of the preceding claims, wherein the filter body ( 12 ) is conically shaped and at the closed end plate ( 20 ) has a larger outer diameter than on its opposite end face ( 60 ). Filter element according to one of the preceding claims, wherein the bulge ( 30 ) is formed as a hollow cylinder. Filter element according to one of the preceding claims, wherein the bulge ( 30 ) for receiving a secondary filter element ( 80 ) is trained. Filter element according to one of the preceding claims, wherein the bulge ( 30 ) within a clearance of the filter body ( 12 ) is arranged. Filter system ( 100 ), comprising - a housing ( 108 ) with a longitudinal axis (L), - a lid ( 110 ), the housing ( 108 ) closes at one end face, - one at the housing ( 108 ) arranged inlet port ( 102 ) for supplying a medium to be filtered and one on the housing ( 108 ) arranged outlet ( 104 ) for discharging the filtered medium, and - a replaceable filter element ( 10 ) according to any one of the preceding claims. Filter system ( 100 ) according to claim 13, wherein a housing-fixed central tube ( 90 ) is provided. Use of a filter system ( 100 ) according to one of claims 13 to 14 as an air filter, in particular as an air filter of an internal combustion engine.

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