CN111151083A

CN111151083A - Filter device

Info

Publication number: CN111151083A
Application number: CN201811322758.1A
Authority: CN
Inventors: 吴国华; 刘艳玲
Original assignee: Taixing Huichen Filter Manufacturing Co ltd
Current assignee: Taixing Huichen Filter Manufacturing Co ltd
Priority date: 2018-11-08
Filing date: 2018-11-08
Publication date: 2020-05-15

Abstract

The invention relates to a filter device, in particular for filtering intake air of an internal combustion engine, comprising a filter housing (2) having a filter insert (3) arranged therein in a replaceable manner, which separates a raw side from a clean side and which is designed essentially in the form of a cylinder, wherein an axial seal (8) is arranged on an end disk (7) of the filter insert, which, in conjunction with a sealing surface (9) of the filter housing, leads to a seal between the raw side and the clean side, and a holder (10) which is fixed to the filter housing and on which the filter insert is supported in such a way that the filter insert rests reliably with its axial seal on the sealing surface of the filter housing, wherein an elastic device (11) is arranged on at least one end disk (6, 7) of the filter insert, which is elastically supported on the holder in the case of the filter housing and which the filter insert seals axially with its axial seal The element is preloaded against the sealing surface of the filter housing.

Description

Filter device

Technical Field

The invention relates to a filter device, in particular for filtering intake air of an internal combustion engine, according to the preamble of claim 1. The invention also relates to a filter insert suitable for use in a filter device of this type.

Background

Filter devices of this type are sufficiently known, in which the filter insert is fastened in the filter device, for example by means of a clamping screw, or is fixed or prestressed in the filter device by means of a cover of the filter housing. Due to the extremely limited space environment in modern engine compartments or in vehicles in general, it is probably necessary that the usually cylindrical filter insert is mounted or dismounted transversely to its cylinder axis, so that the cover in this case appears as part of the side of the filter housing. In the case of a housing arrangement of this type, there is the problem that the axial offset of the filter insert, which is to be satisfied in order to seal between the original side and the clean side, can only be achieved once again in the case of a transverse installation in a relatively cost-effective manner.

A filter device of this type for filtering intake air of an internal combustion engine is known from EP1286750B1, which has a filter housing with a filter insert, which is arranged in the filter housing in a replaceable manner. The filter insert separates the raw side from the clean side and is substantially cylindrical. In this case, an axial seal is arranged on one of the two end discs of the filter insert, which axial seal, in conjunction with the sealing surface of the filter housing, effects a seal between the raw side and the clean side. A support, which is fixed to the filter housing, is provided separately in the filter housing, on which support the filter insert can be supported in such a way that it rests securely with its axial seal against the sealing surface of the filter housing. In order to brace the filter insert with its axial sealing element against the sealing surface of the filter housing, a clamping wedge is provided, which exerts a force on the filter insert, in other words in such a way that the axial sealing element bears reliably against the sealing surface of the filter housing. However, this type of clamping wedge represents an additional element which must be produced separately and therefore at high cost, and which also subsequently incurs further warehousing and logistics costs.

Disclosure of Invention

The present invention is therefore concerned with the problem of proposing an improved or at least alternative embodiment for a filter device of this type, which is distinguished in particular by a relatively simple installation of the filter insert and also by a reliable sealing or separation between the original side and the clean side within the filter device.

This object is achieved according to the invention by the subject matter of the independent claims. Advantageous embodiments are the subject matter of the dependent claims.

The invention is based on the general idea that the clamping wedges, which have been produced separately and are also used separately for assembly, are now replaced by elastic means already arranged on the end discs of the filter insert, whereby the installation of the filter insert in the filter device is designed to be significantly simpler and, in addition, the production, storage and logistics costs for the clamping wedges are eliminated separately. The filter device according to the invention has a filter housing with a filter insert, which is arranged in a replaceable manner in the filter housing, wherein the filter housing is of cylindrical design and separates the raw air side from the clean air side, for example the raw air side from the clean air side. In this case, an axial seal is arranged on one of the end discs of the filter insert, which axial seal, in conjunction with the sealing surface of the filter housing, effects the aforementioned sealing between the raw side and the clean side. The axial seal is formed from a resilient material, in particular a resilient plastic. Preferably, the axial seal is formed by a thermoplastic elastomer or polyurethane foam. Alternatively, the axial seal can also be formed by Ethylene Propylene Diene Monomer (EPDM), Nitrile Butadiene Rubber (NBR) or by a flexible plastic lip, in particular comprising the same material as the end disc. A support, which is fixed to the filter housing, is arranged separately in the filter housing, on which support the filter insert can be supported in such a way that the filter insert rests reliably with its axial seal against the sealing surface of the filter housing. In this case, according to the invention, elastic means are arranged on at least one end disk of the filter insert, preferably even on both end disks of the filter insert, which elastic means, when the filter insert is inserted into the filter housing, are elastically supported on the above-mentioned support on the filter housing side, and the filter insert is thereby prestressed with its axial seal against the sealing surface of the filter housing. The filter device according to the invention has the fundamental advantage that a separate clamping wedge, which was necessary up to now, can be dispensed with, since it is now arranged in a modified manner in one piece and in particular in one piece on the end disk of the filter insert and can thus be produced together with the end disk in a single processing step. In this case, a separate assembly of the spring arrangement is likewise not necessary, as are separate production and the storage and logistics costs associated therewith, which are associated with the separate production. By means of the direct coupling of the elastic means according to the invention to the end disc, in particular also incorrect mounting by workers can be reliably avoided, whereby the quality in the production of the filter device can be improved.

Expediently, the spring device is formed integrally with the end disk. The one-piece construction of a spring device with an end disc of this type offers the greatest advantage that it can be produced together with the end disc, for example in a plastic injection mold, which means that a one-time adjustment of the injection mold is only a limited additional cost in terms of production. However, the integral design of the spring device with the end disk saves, in particular, the assembly costs that were necessary up to now and the storage and logistics costs for the individual clamping wedges that were likewise necessary up to now. In this case, it is preferred that the spring device is made of the same plastic as the end disk, for example a thermoplastic plastic, wherein the spring effect of the spring device only has to be provided over the life of the filter insert, i.e. only during a predetermined maintenance interval.

In a further advantageous embodiment of the solution according to the invention, the spring device has two spring clips which are arranged opposite one another and extend substantially tangentially to the end disk, and which are connected to the end disk by means of a first and a second web, respectively, the distance between the two respective first webs of the spring clips being smaller than the distance between the two second webs, so that the filter insert can be moved past the first web by the support fixed to the filter housing in the front direction, and the spring clips only then rest against the support on the side of the filter housing, so that, viewed in top view, two lines which extend through the respective first and second webs run in a conical manner toward one another.

Expediently, a stop is arranged on at least one second web. This type of stop limits the push-in movement of the filter cartridge into the filter housing and thus presents the worker with tactile control for the correct installation of the filter cartridge in the filter housing.

The invention is based upon a general idea, inter alia, of providing a filter insert for a filter device of this type with the previously described elastic means on at least one end disc, so that the invention shall also encompass and protect filter inserts of this type. The filter insert according to the invention therefore has a spring device of this type on at least one end disc, which, when the filter insert is inserted into the filter housing, is supported elastically on a support that is fixed to the filter housing or on the side of the filter housing and thus pretensions the filter insert with its axial seal against the sealing surface in the filter housing. The structure of the elastic means, in particular with regard to the respective first and second webs or spring clips, corresponds here to that described in the preceding paragraph.

Further important features and advantages of the invention emerge from the dependent claims, the figures and the associated description with reference to the figures.

It is understood that the features mentioned above and to be described below can be applied not only in the respective given combination, but also in further combinations or on their own, without departing from the scope of the present invention.

Drawings

Preferred embodiments of the invention are illustrated in the figures and are described in detail in the following description, wherein like reference numerals refer to identical or similar or functionally identical components.

Here, each schematically:

fig. 1 shows a filter device according to the invention, in particular for filtering intake air of an internal combustion engine.

Detailed Description

The filter device 1 according to the invention, which is designed in particular for filtering intake air in an internal combustion engine that is not described in detail, has a filter housing 2 in which a filter insert 3, in particular a ring filter insert, is arranged in a replaceable manner. The filter insert 3 separates the raw side 5 from the clean side 4 in a known manner and is substantially cylindrical, i.e. it flows radially from the outside to the inside. On the end side, the filter insert 3 is delimited by two end discs 6 and 7, wherein in this case an axial seal 8 is arranged on the end disc 7, which in combination with a sealing surface 9 of the filter housing 2 leads to a seal between the raw side 5 and the clean side 4. Likewise, a support 10 is provided which is fixed to the filter housing and is arranged on the filter housing side, on which support the filter insert 3 is supported in such a way that it rests securely with its axial seal against the sealing surface 9 of the filter housing 2. According to the invention, an elastic device 11 is arranged on at least one end disk 6, 7 of the filter insert 3, in this case on the end disk 6, which elastic device is elastically supported on a carrier 10 fixed to the filter housing 2 when the filter insert 3 is inserted into the filter housing 2, and the filter insert 3 is thereby prestressed with its axial seal 8 against the sealing surface 9 of the filter housing 2. The filter insert 3 is mounted in the filter housing 2 in such a way that it is perpendicular to the filter insert axis 12. The spring means 11 here replaces the clamping wedges necessary hitherto for this purpose, which are not only produced separately but also have to be additionally assembled, which leads to an unestimable cost disadvantage. In this case, it is preferred that the spring means 11 is formed in one piece with the end disk 6 and can therefore be produced together with this end disk in a simple material injection molding process, in fig. 1 the spring means 11 being arranged on the upper end disk 6, in contrast to the axial seal 8 being arranged on the lower end disk 7. However, it is also obvious that a spring device 11 of this type can alternatively also be arranged on the lower end disk 7 or on both end disks 6, 7, wherein in this case the holder 10 fixed to the housing must be adjusted accordingly.

According to the filter insert 3 of the invention, the end discs 6, 7 of the filter insert are constructed, for example, from a thermoplastic plastic around an axial seal made of polyurethane foam. It can also be seen that the spring device 11 has two spring clips 13 which are arranged opposite one another and extend substantially tangentially to the end disk 6. The spring clips 13 are connected to the end disk 6 by first and

second webs

14 and 15, respectively. Furthermore, a stop 16 is arranged on the second web 15, which limits the insertion movement of the filter insert 3 into the filter housing 2, for example by bearing against the support 10 fixed to the filter housing, and thus indicates the predetermined installation position by tactile means. The insertion direction of the filter insert 3 into the filter housing 2 is thereby indicated by the arrow 17. The spring clip 13 is also arched in the direction of the end disk 6, so that the spring effect of the spring clip is produced when the filter housing 2 is pushed in. When the filter housing 2 is pushed in, i.e. by bearing against the support 10 on the filter housing side, the spring clip 13 is correspondingly deformed downward and is thereby bent in a linear direction. Nevertheless, after the filter insert 3 has been completely pushed into the filter housing 2, the spring clip 13 remains at least at a certain degree of curvature, as a result of which the spring effect of the spring clip 13 and thus the elastic pretensioning of the axial seal 8 against the sealing surface 9 is obtained.

It can be seen that the two first webs 14 in the push-in direction 17 have a smaller distance a from one another than the second webs 15, the distance B of which in the radial direction is greater. Due to this fact, the filter insert 3 can be moved past the support 10 fixed to the filter housing with the first web 14 and only then does the spring clip 13 come into contact with the support 10 on the filter housing side. This makes it possible to mount the filter insert 3 in the filter housing 2 transversely to the filter insert axis 12.

The filter insert 3 can be designed as a conventional ring filter insert with zigzag-folded filter material and additionally has an inner frame or an outer frame, not shown, for increased rigidity.

The assembly of the filter insert 3 in the filter housing 2 of the filter device 1 with the filter insert 3 according to the invention and the filter device 1 according to the invention is significantly simplified and therefore made more cost-effective, since the necessary spring device 11 for the pretensioning is now formed in one piece or integral with the filter insert 3, i.e. in particular with the end discs 6, 7 of the filter insert 3, and no longer has to be produced separately, as was hitherto the case with separate clamping wedges, but rather has to be assembled separately at high cost. It is conceivable here that the production of the spring device 11 is simple, in particular by a corresponding modification of the plastic injection mold, so that only limited additional costs are incurred for the spring device 11 according to the invention. Furthermore, incorrect assembly can be reliably avoided by setting the distance a between two first webs 14 in the insertion direction to be smaller than the distance B between two subsequent second webs 15 in the insertion direction, so that a foolproof System (Poka-Yoke-System) can be created.

Claims

1. A filter device (1), in particular for filtering intake air of an internal combustion engine, having a filter housing (2) with a filter insert (3) which is arranged exchangeably therein and which separates a raw side (5) from a clean side (4) and which is designed essentially cylindrically, wherein an axial seal (8) is arranged on an end disk (7) of the filter insert (3) which, in conjunction with a sealing surface (9) of the filter housing (2), leads to a seal between the raw side (5) and the clean side (4),

-the filter device further comprises a holder (10) fixed to the filter housing, on which the filter insert (3) is supported in such a way that the filter insert rests securely with its axial seal (8) against the sealing surface (9) of the filter housing (2), characterized in that an elastic device (11) is arranged on at least one end disk (6, 7) of the filter insert (3), which elastic device is supported elastically on the holder (10) fixed to the filter housing in the inserted state of the filter insert (3) into the filter housing (2) and the filter insert (3) is prestressed with its axial seal (8) against the sealing surface (9) of the filter housing (2).

2. A filter device as claimed in claim 1, characterised in that the elastic means (11) are constructed in one piece with the end discs (6, 7).

3. A filter device according to claim 1 or 2,

the end disks (6, 7) are made of thermoplastic, and the axial seal (8) is made of a resilient plastic, in particular polyurethane foam.

4. A filter device according to any one of claims 1 to 3,

the spring device (11) has two spring clips (13) which are arranged opposite to each other and extend substantially tangentially to the end discs (6, 7).

5. The filter device of claim 4,

the spring clips (13) are connected to the end disks (6, 7) by means of a first web (14) and a second web (15), respectively.