CZ366399A3 - Filter element for air filter and process for producing thereof - Google Patents

Abstract

The invention relates to a filter element for an air filter, consisting of a zigzag folded filter pad (2, 8,10) made of filter paper or filter fleece and sealed (6) \ t running on the outer edges of the flat face filter pad (2, 8, 10) through which the filter pad the element (1,7,9) abuts the filter housing part. Folded the filter insert (2, 8, 10) has at least one side on the one hand; in certain areas of the contour deviating from the plane a smiles continuous zigzag folding.

Description

Technical field

The invention relates to a filter element for an air filter having a pleated filter element, in particular for the intake air filtration of an internal combustion engine, according to the preamble of the first claim and the method claim.

BACKGROUND OF THE INVENTION

DE 42 18 396 A1 discloses the production of a filter element with a relatively large filter surface, particularly for use in internal combustion engines of trucks and construction machines. These filter elements are provided on at least one side with at least an edge running under sealing for sealing the raw air side against the clean air side.

The known filter element can be designed in such a way that, by varying the height of the folds, it can be adapted to a particular geometry of the filter housing or to the housing. downstream aggregates. The individual filter elements are manufactured separately and connected to each other by means of additional connecting bridges acting as hinges.

SUMMARY OF THE INVENTION

The invention is based on the object of providing a filter element of the above type in such a way that optimized folded contours can be achieved in a simple manner.

filter cartridges.

In the filter element according to the invention, the pleated filter element has, on one side at least in certain regions of the contour, a surface deviating from the plane, while having a continuous zigzag folding. According to the invention, the filter element can be simply adapted to a complex design in the region of the intake of an internal combustion engine, by optimizing the use of space in this region of the filter element. By providing a good fit of the filter element on the geometry in the suction tract, the invention also serves to improve the flow ratios at the air inlet side of the filter element.

For example, oblique, corner or arched contours may also be provided on the respective side of the filter element, with a continuous zigzag folding ensuring a uniform filter effect over the entire filter surface. On the other side of the filter element, there is an evenly planar surface without connecting bridges, the regions of different height of the folds being connected to one another continuously.

In a simple method of manufacturing the filter element according to the invention, the folded regions of the filter element with different height of folds are preformed, and when assembling the filter element they are glued, pressed or otherwise firmly connected to each other in adjacent folds.

It is known per se from DE 42 23 723 C2 that a strip of filter paper is unwound from a supply roll for the production of a zigzag-shaped filter element and pressed for preparation.

warehouses. The preformed filter paper webs are then folded according to the embossments in the respective apparatus. In order to produce the filter element according to the invention, the spacing of the individual indentations is varied so as to achieve different fold heights, thus obtaining correspondingly varying contours on one side of the folded web.

Further advantageous embodiments are set forth in the dependent claims.

BRIEF DESCRIPTION OF THE DRAWINGS

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT OF THE PREFERRED EMBODIMENT OF THE FILTRATION ELEMENT OF THE INVENTION A BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a first exemplary embodiment with graduated contours on the filter cartridge side; FIG. 2 shows another embodiment of FIG. 1, FIG. Fig. 4 shows a fourth embodiment of the filter element with areas with different folding directions, Fig. 6 shows an example of the embodiment according to Fig. 4, Fig. 5 shows a second embodiment with oblique contours on one side of the filter element; 2

7 shows the embodiment of FIG. 3 with the housing parts.

Examples

FIG. 1 shows a cross-section of a filter element 1 with a zigzag formed filter element 2 having on its underside an area 3 of relatively low storage height and a storage area 4 of relatively large storage height. 2 shows a different view of the filter element 1, in which there is also a storage area 5 with a small storage height on the right side. These areas can be arranged in different locations, not shown, depending on the application.

The filter element 1 has on its upper side a circumferential seal 6 with which the filter element 1 can be tightly inserted into an air filter housing (not shown) in the air intake of the internal combustion engine. The intake air passes through the filter element 1 according to arrow 11 from the contoured side to the other side, in this case lying on the top, whereby optimum flow ratios occur through the contoured geometry of the suction side of the filter element.

The production of the filter element 2 according to FIGS. 1 and 2 can be carried out in such a way that the individual regions and 4 are produced separately and then the adjacent stores of the regions 3, 4, 5 are joined together.

9 9 9 9 9 9 9 9 9 9 9 9 9 999 999 9 9 9 9 9 9 9 9 9 9 · «

According to the embodiment according to FIG. 3, the filter element 2 is provided with a filter element 8 which runs obliquely on the contour side. The height of the folds, varying along the area of this side of the filter element 8, can be obtained by varying the folding distances of the webs or sheets, based on the description of the folding procedure known from DE 42 23 723 C2).

In order to obtain optimum contour matching in the case of the domed geometry of the suction tract, according to the exemplary embodiment of the filter element 9 shown in FIG. 4, one side of the filter element 10 is also appropriately arched. This varying camber can also be produced, for example, by a correspondingly controlled variation of the warehouse spacings or, for example, by a corresponding control of the spacing. embossing, in the process of folding.

According to the embodiment according to FIG.

is a filter that everyone has

Giant. 6 shows a filter element according to FIG. 2, with a housing 20, in which the raw air enters from the side in the direction of the arrow 21. A uniform volumetric flow can thus be achieved since, due to the relatively large filter area in the rear region 4 from the point of entry, establish a relatively large volumetric flow. This effect is also clearly apparent from FIG. 7, since here, with a continuously decreasing filter surface corresponding to FIG. 3, in the front region at the point of entry, the volume flow can also be uniform.

• 4 • 000 4

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List of reference numbers Filter element Filter element Warehouse area Warehouse area Warehouse area Seal Filter element Filter element Filter element Filter element Arrow (flow direction) Filter element Warehouse area Warehouse area Housing arrow (flow direction of incoming raw air)

Claims (10)

• 9 9 99 P ATENTOVÉ NÁ YEARS 1. Filtration element for air filter, Consisting of zig Zag stacked filtrační liners (2; 8; 10) from filtering or and filtration fleece, seal (6) in progress at the outer edges around flat sides filtrační liners (2; 8; 10), through the filter element (1; 7; 9; 10) abuts on components filter housings, whereas stacked filtrační insert (2 ; 8; 10) has on one side at least in certain areas of the contour across the surface deviating from the plane while has continuous zig Zag folding. Filter element according to claim 1, characterized in that the pleated filter element (2; 8; 10) has corresponding contours also flatly deviating from the plane on this bearing surface on the side abutting the component with non-planar contours. Filter element according to claim 1, characterized in that the pleated filter element (2; 8; 10) has on the raw air side a height of folds varying along the surface of the filter element so that the volumetric flow is uniform. A filter element according to claim 3, characterized in that the pleated filter element (2; 8; 10) has in place a filter element (2; 8; 10). The raw air inlet relatively smallest filtration area due to the relatively small height of the warehouses, and the height of the warehouses increases continuously or infinitely away from the point of entry. Filter element according to one of the preceding claims, characterized in that the contours on one side of the filter element (2) are formed by storage areas (3, 4, 5) with different storage heights, which are always adjacent to the border storage of the adjacent area (3). , 4, 5) warehouses glued, pressed, stamped or otherwise connected to each other. Filter element according to one of Claims 1 to 3, characterized in that the contours on one side of the filter element (2; 8; 10) are formed in one stage, by varying the height of the individual folds or groups of folds. Filter element according to one of the preceding claims, characterized in that the contours on one side of the filter element (2; 8; 10) are formed by varying the height of the folds along each coordinate. Filter element according to one of Claims 1 to 6, characterized in that the contours on one side of the filter element (2; 8; 10) are formed by varying the height of the folds along both coordinates. Filter element according to one of the preceding claims, characterized in that the contours on one side of the filter element (2; 8; 10) are defined by the geometry of the aggregate bordering after the filter element (1; 7; 9; 10) has been incorporated into the intake tract of the combustion. engine with this side. • · Method for producing a filter element according to any one of claims 5 to 8, wherein the filter material bands are pressed for the filter element (8; 10) to prepare the folding at predetermined, partially different intervals and then folded according to the embossments, and then the bands The filter material is separated from the supply belt, fixed in position and provided with a peripheral seal.