Filter insert for a filter unit

Abstract

The invention relates to a filter insert (10) for a filter unit which comprises an electric contacting element (100, 100b), wherein the filter insert (10) can be inserted into an insert receiving region of the filter unit, comprising an electrically insulating filter material (14), at least one electrically conductive element (16a, 16b), and at least one contacting point (20a, 20b) for producing an electric contact between the filter insert (10) and the electric contacting element (100a, 100b), and the contacting point (20a, 20b) and / or a region adjoining the contacting point (20a, 20b) is designed as a hook-and-loop connection surface.

Description

[0001] Filter insert for a filter unit

[0002] The invention relates to a filter insert for a filter unit comprising an electrical contacting element, wherein the filter insert can be inserted into an insert receiving area of ​​the filter unit, with an electrically insulating filter material, at least one electrically conductive element and at least one contact point for electrically contacting the filter insert with the electrical contacting element.

[0003] Furthermore, the invention relates to a filter unit with a filter insert, an insert receiving area into which the filter insert can be inserted, and at least one contacting element arranged on the insert receiving area for electrically contacting the filter insert.

[0004] The electrical contacting of an electrified filter insert can be achieved, for example, via dimensionally stable contact elements, such as contact pins. Such contact elements are typically made of metal, which can lead to mechanical abrasion at the contact points of the filter insert during insertion and operation of the filter unit.

[0005] To reduce the mechanical stress on the contact points, it is known from practice to mount the contact elements on springs, so that the contact force between the contact elements and the contact points of the filter insert is limited to the spring force. Despite this reduction in contact force, significant abrasion occurs during operation of the filter unit due to relative movements between the contact elements and the contact points of the filter insert, which can damage the contact points of the filter insert in particular. Damage to the contact points can impair the electrical contact and thus the filter function of the filter insert.

[0006] The object underlying the invention is therefore to improve the electrical contacting of an electrified filter insert.

[0007] The object is achieved by a filter insert of the type mentioned at the outset, wherein the contact point and / or an area of ​​the filter insert adjacent to the contact point is designed as a hook and loop connection surface.

[0008] The hook-and-loop connection surface creates a hook-and-loop connection in the contact area when inserting the filter insert into the insert receiving area. The hook-and-loop connection eliminates or at least reduces micro-movements between the contact point of the filter insert and the contact element in the insert receiving area, significantly reducing abrasion effects.

[0009] The hook-and-loop connection surface can partially surround the contact point. The hook-and-loop connection surface can be arranged on two opposite sides of the contact point. The contact point is preferably connected to the at least one electrically conductive element. The electrical contact element can be connected to an electrical supply module or be part of an electrical supply module. Alternatively, the electrical contact element can be connected to a grounding connection. Thus, the contact can be used for grounding to dissipate an unintentional electrostatic charge.

[0010] The filter insert according to the invention is further advantageously further developed by an electrical conduction path, wherein the electrical conduction path and / or a region adjacent to the electrical conduction path is preferably designed as a hook-and-loop connection surface. The electrical conduction path is preferably electrically conductively connected to the contact point. Preferably, the electrical conduction path forms the contact point, and the adjacent region forms the hook-and-loop connection surface.

[0011] In a further preferred embodiment of the filter insert according to the invention, the electrical conduction path or the hook-and-loop connection surface comprises a voltage divider. The voltage divider preferably comprises a resistance path along which a suitable voltage level for operating the electrically conductive element can be tapped. The voltage divider allows a high supply voltage to be applied to the filter insert, which is then reduced to a suitable voltage level before being applied to the electrically conductive element.

[0012] Furthermore, a filter insert according to the invention is advantageous in which the hook-and-loop connection surface comprises a plurality of barbs and / or a plurality of loops. The hook-and-loop connection surface can preferably be formed by loops of a textile fabric, such as a fleece or felt. The hook-and-loop connection surface is preferably made of an electrically non-conductive material. If the hook-and-loop connection surface has a plurality of barbs, it can be formed by a hook tape. If the hook-and-loop connection surface has a plurality of loops, it can be formed by a fleece tape. Alternatively, the hook-and-loop connection surface can be formed by a mushroom-head tape or a velour tape.

[0013] In another preferred embodiment of the filter insert according to the invention, the hook-and-loop connection surface is electrically conductive at least in sections. For example, the barbs and / or loops are made of an electrically conductive material. In this case, the hook-and-loop connection surface ensures both the fixation of the filter insert in the insert receiving area of ​​the filter unit and the electrical contacting of the filter insert with one or more contact elements.

[0014] In a further preferred embodiment of the filter insert according to the invention, the hook-and-loop connection surface is located on a lateral material strip of the filter insert. The lateral material strip can be made of a textile material, in particular a nonwoven fabric. The lateral material strip can, for example, be a side lamination of the filter insert.

[0015] In a further preferred embodiment of the filter insert according to the invention, the electrically conductive element is a polarizing element to which an electrical voltage can be applied to polarize the filter material. The polarizing element is preferably designed as an electrically conductive polarizing layer. The polarizing layer preferably runs parallel to the electrically insulating filter material and / or is in planar contact with the electrically insulating filter material.

[0016] Furthermore, a filter insert according to the invention is preferred in which two electrically conductive elements, each designed as a polarization layer, are separated from each other by the electrically insulating filter material. An electrical voltage can be applied to the polarization layers to polarize the filter material. The electrically insulating filter material and the two electrically conductive polarization layers preferably form a pleated layer composite.

[0017] The object underlying the invention is further achieved by a filter unit of the type mentioned above, wherein the filter insert of the filter unit according to the invention is designed according to one of the embodiments described above. With regard to the advantages and modifications of the filter unit according to the invention, reference is therefore first made to the advantages and modifications of the filter insert according to the invention.

[0018] In a preferred embodiment, the filter unit according to the invention has an electrical supply device, wherein the contacting element is connected to the electrical supply device or is a component of the electrical supply device. The electrical supply device preferably serves to supply current to the electrically conductive element. If the electrically conductive element is designed as a polarization element, in particular as a polarization layer, and / or if the filter insert has two electrically conductive elements designed as polarization elements or polarization layers, the electrical supply device serves to provide electrical power for the polarization process. The filter unit can furthermore have an ionizer. In this case, the electrical supply device can also serve to supply current to the ionizer.

[0019] Furthermore, a filter unit according to the invention is advantageous in which the contacting element and / or a region adjacent to the contacting element is designed as a hook-and-loop connection surface on or in the insert receiving area. The hook-and-loop connection surface is preferably configured to form a hook-and-loop connection with the hook-and-loop connection surface of the filter insert. Thus, by inserting the filter insert into the insert receiving area, a fixation of the filter insert in the insert receiving area based on a hook-and-loop connection can be implemented. Furthermore, the filter insert can be pulled out of the insert receiving area by applying a tensile force that is greater than the holding force of the hook-and-loop connection.

[0020] Furthermore, a filter unit according to the invention is preferred in which the hook-and-loop connection surface on or in the insert receiving area comprises a plurality of, in particular electrically conductive, barbs and / or a plurality of, in particular electrically conductive, loops. If the hook-and-loop connection surface on or in the insert receiving area has a plurality of barbs, it can be formed by a hook tape. If the hook-and-loop connection surface on or in the insert receiving area has a plurality of loops, it can be formed by a fleece tape. Alternatively, the hook-and-loop connection surface on or in the insert receiving area can be formed by a mushroom-head tape or a velour tape.

[0021] A preferred embodiment of the invention is explained and described in more detail below with reference to the accompanying drawings.

[0022] Fig. 1 shows a perspective view of a filter insert according to the invention. Fig. 1 shows a filter insert 10 for a filter unit that can be used in a motor vehicle. The filter unit serves, for example, as an interior air filter of the motor vehicle.

[0023] The filter insert 10 comprises a pleated multi-layer composite 12. The composite 12 comprises an electrically insulating filter material 14 and two electrically conductive elements 16a, 16b. The electrically conductive elements 16a, 16b are designed as polarization layers. An upper polarization layer 16a is located above the filter material 14. A lower polarization layer 16b is located below the filter material 14.

[0024] Material strips 18a, 18b run along the outer edges of the pleated layer composite 12. The material strips 18a, 18b form the side laminations of the filter insert 10 and are integrally bonded, for example, by adhesive bonding, to the pleated layer composite 12.

[0025] The filter insert 10 can be inserted into an insert receiving area of ​​the filter unit. Electrical contact elements 100a, 100b are located in the insert receiving area. The contact elements 100a, 100b serve to electrically contact the filter insert 10. The contact elements 100a, 100b are electrically connected to an electrical supply device (not shown) of the filter unit. The contact elements 100a, 100b or the areas adjacent to the contact elements 100a, 100b are designed as a hook-and-loop connection surface.

[0026] The filter insert 10 comprises two contact points 20a, 20b for electrically contacting the filter insert 10 with the electrical contact elements 100a, 100b.

[0027] The contact points 20a, 20b are located on the material strip 18a, with the contact points 20a, 20b and / or the areas adjacent to the contact points 20a, 20b being designed as hook-and-loop connection surfaces. The hook-and-loop connection surfaces 20a, 20b of the filter insert 10 and the hook-and-loop connection surfaces formed by the contact elements 100a, 100b or around the contact elements 100a, 100b form hook-and-loop connections. The hook-and-loop connections eliminate or at least reduce micromovements between the contact points 20a, 20b of the filter insert 10 and the contact elements 100a, 100b in the insert receiving area, thereby significantly reducing abrasion effects. The hook and loop connection surfaces formed by the contact points 20a, 20b and / or the areas adjacent to the contact points 20a, 20b may comprise a plurality of barbs and / or a plurality of loops.Preferably, the material strip 18a is a nonwoven material strip or a felt material strip, so that the hook-and-loop connection surface is formed by loops of the nonwoven material strip or the felt material strip. If the hook-and-loop connection surfaces formed by the contact points 20a, 20b and / or by the areas adjacent to the contact points 20a, 20b comprise a plurality of loops, the hook-and-loop connection surfaces formed by the contacting members 100a, 100b and / or by the areas adjacent to the contacting members 100a, 100b comprise a plurality of barbs that can engage the loops.

[0028] The filter insert 10 further comprises an electrical conduction path 22, wherein the electrical conduction path 22 is electrically conductively connected to the contact points 20a, 20b. The conduction path 22 is an electrically conductive strip that extends over the entire length of the material strip 18a. Through the contact sections 24a, 24b, which are connected to the electrically conductive elements 16a, 16b designed as polarization layers, the conduction path 22 forms a voltage divider 26. The voltage divider 26 has a resistance path 28, along which a voltage level suitable for polarizing the filter material 14 is tapped via the contact sections 24a, 24b. The contact sections 24a, 24b are electrically conductive contact strips. The contacting section 24a is connected to the upper electrically conductive element 16a formed as a polarization layer.The contacting section 24b is connected to the lower electrically conductive element 16b, which is designed as a polarization layer. Reference numeral.

[0029] 10 filter inserts

[0030] 12 layer composite 14 filter material

[0031] 16a, 16b Elements

[0032] 18a, 18b material strips

[0033] 20a, 20b contact points

[0034] 22 Conductive path 24a, 24b Contact sections

[0035] 26 voltage dividers

[0036] 28 resistance section

[0037] 100a, 100b contact elements

Claims

Claims 1. Filter insert (10) for a filter unit comprising an electrical contact element (100a, 100b), wherein the filter insert (10) can be inserted into an insert receiving area of ​​the filter unit, with an electrically insulating filter material (14); at least one electrically conductive element (16a, 16b), and at least one contact point (20a, 20b) for electrically contacting the filter insert (10) with the electrical contact element (100a, 100b); characterized in that the contact point (20a, 20b) and / or an area adjacent to the contact point (20a, 20b) is designed as a hook and loop fastener surface.

2. Filter insert (10) according to claim 1, characterized by an electrical conduction path (22), wherein the electrical conduction path (22) and / or an area adjacent to the electrical conduction path (22) is preferably designed as a hook and loop fastening surface.

3. Filter insert (10) according to claim 2, characterized in that the electrical conduction path (22) or the Velcro fastening surface comprises a voltage divider (26).

4. Filter insert (10) according to one of the preceding claims, characterized in that the hook and loop fastening surface comprises a plurality of barbs and / or a plurality of loops.

5. Filter insert (10) according to one of the preceding claims, characterized in that the hook and loop fastening surface is at least partially electrically conductive.

6. Filter insert (10) according to one of the preceding claims, characterized in that the hook and loop fastening surface is located on a lateral strip of material of the filter insert (10).

7. Filter insert (10) according to one of the preceding claims, characterized in that the electrically conductive element (16a, 16b) is a polarizing element to which an electrical voltage can be applied to polarize the filter material (14), wherein the polarizing element is preferably designed as an electrically conductive polarizing layer.

8. Filter insert (10) according to one of the preceding claims, characterized in that two electrically conductive elements (16a, 16b) each designed as polarization layers are separated from each other by the electrically insulating filter material (14).

9. Filter unit, comprising a filter insert (10); an insert receiving area into which the filter insert (10) can be inserted; and at least one contacting element (100a, 100b) arranged on the insert receiving area for electrically contacting the filter insert (10); characterized in that the filter insert (10) is designed according to one of the preceding claims.

10. Filter unit according to claim 9, characterized by an electrical supply device, wherein the contacting element (100a, 100b) is connected to the electrical supply device or is a component of the electrical supply device.

11. Filter unit according to claim 9 or 10, characterized in that the contacting element (100a, 100b) and / or an area adjacent to the contacting element (100a, 100b) is configured as A hook-and-loop fastening surface is formed on or in the insert receiving area, which is configured to form a hook-and-loop connection with the hook-and-loop fastening surface of the filter insert (10).

12. Filter unit according to claim 11, characterized in that the hook-and-loop fastening surface on or in the insert receiving area comprises a plurality of, in particular electrically conductive, barbs and / or a plurality of, in particular electrically conductive, loops.

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