Filter element for filtering media

Abstract

Filter element for filtering media, in particular gases, especially intake air, fuel, urea solution or engine oil, in particular of an internal combustion engine, especially of a motor vehicle, or ambient air for introduction into ventilation systems of buildings or vehicles, with a zigzag-folded filter medium, comprising the following features: - each fold (6) is formed from two fold sheets which meet to form a fold point (7) on the exposed raw side (3); - two adjacent folds (6) form a fold base (8) together; - the raw side (3) and / or the clean side (4) of the filter medium has a plurality of elongated adhesive sections along at least two adhesive tracks (14), each with at least one adhesive section and at least one adhesive interruption (15), characterized by the following features: - the mutual distance between the two fold leaves in the area of ​​the fold tip (7) is between zero and two mm, or the two fold leaves in the area of ​​the fold tip (7) lie against each other; - the fold spacing (9) between the two fold sheets of a fold pocket (11) is at least twice the fold spacing in the area of ​​the fold base (8) in the area of ​​the fold apex (7), wherein the fold pockets (11) are angular and are produced by providing embossing lines and the fold base (8) is formed from a polygon - the ratio of the fold height (10) to the fold spacing (9) in the area of ​​the fold base (8) is greater than 25 : 1, 50 : 1, 150 : 1 or lies between these values.

Description

Technical field

[0001] The invention relates to a filter element for a filter for filtering media, in particular gases, especially intake air, fuel or engine oil, particularly from an internal combustion engine, particularly from a motor vehicle, or ambient air for introduction into ventilation systems of buildings or vehicles, comprising a zigzag-folded filter medium with a raw side and a clean side, wherein a plurality of elongated adhesive sections are arranged on the raw side and / or on the clean side of the filter medium along at least two adhesive tracks, which run at least partially obliquely or perpendicularly to the fold edges, wherein at least one adhesive section and at least one adhesive interruption are arranged on each adhesive track. The adhesive tracks serve in particular to stabilize the filter element and / or to stabilize the folds. State of the art

[0002] Various filters with pleated filter media are known from the prior art. WO 2007 / 056567 A1 describes a device and a method for manufacturing pleated filter elements with different pleat heights. WO 2011 / 026999 A1 describes a variety of filter elements with differently designed adhesive applications. Other relevant intellectual property rights are AT 368402 B, EP 0948986 A1, FR 2490970 A1, and US 2011 / 0186504 A1. Task

[0003] The invention is based on the objective of creating a filter element that is stable, even with large pleat heights, and that exhibits the highest possible filter efficiency. The filter element should maintain high stability during operation. The flow pattern of the medium to be filtered should be optimized as much as possible.

[0004] This problem is solved by designing a filter element according to claim 1.

[0005] The inventor has combined the well-known method of applying traces of adhesive with the design of the folds.

[0006] A filter element for filtering a medium, particularly for an internal combustion engine, is proposed, featuring a folding pattern designed to create the largest possible storage space, capable of holding a relatively large volume of particles to be filtered. This storage space is formed between two adjacent folded sheets. Viewed in a longitudinal section through the filter element, the storage space can be U-shaped, V-shaped, sack-shaped, or pear-shaped. On the raw side, where the medium to be filtered flows towards the filter element, each fold tapers to a very narrow point, acting as a flow divider. The storage space into which the medium to be filtered enters is thus intended to be large compared to the two adjacent spaces.

[0007] Such an asymmetry leads to an increase in the storage volume on the raw side, and thus to a longer service life. More dust can be captured than with a symmetrical arrangement of the pleats of a pleated bag.

[0008] The larger storage volume is particularly advantageous at lower filtration speeds, for example in commercial vehicle or industrial applications. In these applications, dust cake formation on the media surface is a significant factor. In practice, this refers to filtration speeds of the medium of, for example, < 6 cm / s.

[0009] The invention is particularly well suited for use with flat filter elements, especially those with large pleat heights, but also with round filter elements.

[0010] An important aspect is the internal support of each individual pleated pocket. Plastic spacers or support beads of adhesive can be used for this purpose. This is necessary because the negative pressures created in the intake manifold during the operation of an internal combustion engine can cause the pleats to collapse in the flow areas of the medium. This results in opposite sections of the filter media coming into direct contact with each other. Furthermore, material irregularities can cause stresses and deformations that lead to collapse on the raw side.

[0011] The invention is explained in more detail with reference to the drawing. The drawing illustrates the following: Fig. Figure 1 shows a filter element in perspective view. Fig. Figure 2 shows a schematic representation of a filter bellows made of filter medium of a first embodiment with several pleated pockets. Fig. Figure 3 shows a filter bellows made of filter medium of a non-inventive embodiment with several pleated pockets. Fig. Figure 4 shows a perspective view of a section of a filter element with three pleated pockets. Fig. Figure 5 shows a fragment of spacers in perspective.

[0012] The in Fig. The filter element 1 shown contains a filter bellows 2. Opposite is the clean-side outflow side 4. The filter bellows 2 is located in a plastic housing 5.

[0013] The in Fig. The filter bellows 2, shown in a section and a side view, has pleated leaves 12 and 13. The medium to be filtered is fed in from the raw side 3 (inflow side) and discharged from the clean side 4 (outflow side). The pleat apex 7, facing the flow, tapers to a point. The pleat base 8, however, is very wide. See the pleat spacing 9 in the region of the pleat base. In this way, pleat pockets 11 of considerable volume are formed. Each pleat pocket is formed by two pleated leaves 12 and 13. The pleat height 10 is relatively large. In practice, a ratio of the pleat height 10 to the pleat spacing 9 in the order of 25:1 to 130:1 is desired.

[0014] The pleated pockets 11 are essentially U-shaped. They are angular; see the edges 6. They are created by providing embossing lines.

[0015] The filter bellows 2 according to Fig. 3 includes pleated pockets 11 of a different shape. The flow-facing - raw-side - pleat tips 7 are again quite pointed, as in the embodiment according to Fig. 2, however, the folding pocket 11 essentially has the shape of a roof tile. The base of the fold 8 is formed here from a circular arc. According to the invention, however, it is formed from a polygon.

[0016] Fig. Figure 4 shows, in perspective, a section of a filter bellows 2 with three pleated pockets. Adhesive strips 14 are applied as spacers to both sides of the pleated surfaces. The adhesive strips 14 run in the direction of the web feed – that is, in the direction in which the filter element is produced by conveying and folding a strip of material lengthwise. The adhesive strips 14 are interrupted. See the dashed lines indicating the interruptions 15.

[0017] Fig.Figure 5 shows a fragmentary, spatial representation of a section of a group of spacers 14 in the form of objects made of paper, cardboard, or plastic. It can be seen that the spacers are intended for use in a V-shaped fold.

Claims

[1] Filter element for filtering media, in particular gases, especially intake air, fuel, urea solution or motor oil, in particular of an internal combustion engine, in particular of a motor vehicle, or ambient air for introduction into ventilation systems of buildings or vehicles, with a zigzag-folded filter medium, comprising the following features: - each fold (6) is formed from two fold sheets which meet to form a fold point (7) on the exposed raw side (3); - two adjacent folds (6) form a fold base (8) together; - the raw side (3) and / or the clean side (4) of the filter medium has a plurality of elongated adhesive sections along at least two adhesive tracks (14), each with at least one adhesive section and at least one adhesive interruption (15), characterized by the following characteristics: - the mutual distance between the two fold leaves in the area of ​​the fold tip (7) is between zero and two mm, or the two fold leaves in the area of ​​the fold tip (7) lie against each other; - the fold spacing (9) between the two fold sheets of a fold pocket (11) is at least twice the fold spacing in the area of ​​the fold base (8) in the area of ​​the fold apex (7), wherein the fold pockets (11) are angular and are produced by providing embossing lines and the fold base (8) is formed from a polygon - the ratio of the fold height (10) to the fold spacing (9) in the area of ​​the fold base (8) is greater than 25 : 1, 50 : 1, 150 : 1 or lies between these values. [2] Filter element according to claim 1, characterized by that the fold sheets (12, 13) of at least one fold pocket (11) are parallel to each other or inclined to each other. [3] Filter element according to claim 1 or 2, characterized by, that the adhesive traces (14) are arranged equidistantly. [4] Filter element according to any one of claims 1 to 3, characterized by , that the distances between adjacent adhesive traces (14) increase or decrease when viewed in the direction of the fold tip from one end face of the filter element (2) to the other end face. [5] Filter element according to any one of claims 1 to 4, characterized by , that the distances between adjacent adhesive traces (14) with respect to a mirror plane running perpendicular to the fold edges, preferably central with respect to the extension of the filter medium in the direction of the fold edges, increase particularly towards the outside. [6] Filter element according to any one of claims 1 to 5, characterized by , that the filter element (2) is a flat filter element. [7] Filter element according to any one of claims 1 to 6, characterized by its use when the filtration rate of the medium is < 6 cm / s.

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