DE102013018201A1 - Filter insert and air filter - Google Patents

Abstract

The invention describes a filter insert (100) for an air filter (200), comprising
At least one filter medium (10) designed for filtering the air flow with an inflow-side end and a downstream end following the flow direction of the air flow,
- A trained for deriving the filtered air Reinluftableitelement (30) with a extending in the flow direction of the air flow lateral surface (36), said lateral surface (36) from the filter medium (10) is enveloped, and
- An upstream end member (20) formed for sealing the clean air side of the filter cartridge (100) from the Rohluftseite filter insert (100).
In order to further develop the filter insert (100) in such a way that the air flow flows through the largest possible area of the filter medium (10), it is proposed that the upstream end of the filter medium (10) has at least one region (16) at which the air flow is free in the Filter medium (10) can flow

Description

Technical area

The invention relates to a filter insert according to the preamble of claim 1. The invention further relates to an air filter for separating liquid and / or solid particles from an air stream to be cleaned comprising a respective filter insert.

State of the art

From the publication EP1 457 247 B1 an air filter according to the preamble of claim 1 is known. In this known filter cartridge, the entire region of the upstream end of the filter medium is covered by an upstream end disk. The inflow-side end plate forms a sealing end of the filter element and also has a handle element designed for handling the filter insert and for fixing the filter insert in the filter housing.

As in the case of the publication EP 1 457 247 B1 known air filter, the inflow side of the filter medium is completely covered by the upstream end plate, the air to be filtered is deflected so that it flows only radially into the filter medium. In the area near the upstream end disk, for example in the region of the upstream third, no air enters the filter medium. The filter medium is therefore not or hardly flowed through by the air to be filtered in the area near the upstream end disk.

The invention has the object of providing a filter insert of the type mentioned in such a way that the air flow flows through the largest possible area of the filter medium. Furthermore, the pressure of the air flow at the upstream end of the filter medium should differ as little as possible from the pressure of the air flow at the downstream end of the filter medium. In particular, the pressure drop delta p, ie the flow-related pressure difference of the air flow before and after the filter medium, should be as low as possible and essentially the entire area of the filter medium should be used.

Disclosure of the invention

This object is achieved by a filter cartridge having the features specified in claim 1 and by an air filter with the features specified in claim 9. Advantageous embodiments and expedient developments of the present invention are characterized in the respective subclaims.

Thus, the present invention is based on the fact that the upstream end of the filter medium has at least one free area at which the air flow can flow freely into the filter medium. This free region advantageously comprises at least half, in particular at least two-thirds, for example at least five-sixths, of the surface of the upstream end of the filter medium. In contrast to the prior art, the air can thus flow axially into the filter element.

The filter medium is designed for filtering air, for example for purifying combustion air of an internal combustion engine.

According to a particularly advantageous embodiment of the invention, the filter medium is folded and has an end edge bonding formed to seal the fold ends. The front edge bonding is designed to seal the clean air side of the filter insert, in particular the filter medium, from the unfiltered air side of the filter insert, in particular the filter medium.

The pleat ends of the filter medium are preferably arranged at the upstream end and at the downstream end of the filter medium. The front edge gluing can be arranged on the raw side of the pleat ends and / or on the clean side of the pleat ends.

The front edge bonding is preferably designed for sealing in the direction of the longitudinal axis of the filter insert, ie in the axial direction. The front edge bonding thus preferably ensures a clean air-side axial seal. To provide an axial seal, the leading edge bonding is preferably located at the upstream end of the filter medium and, optionally, also at the downstream end of the filter medium. When from the publication EP 1 457 247 A1 known air filter, however, takes place by an end plate, which completely covers the inflow side of the filter medium.

According to an advantageous embodiment of the present invention, the inflow-side end element for sealing the clean air side of the filter insert, in particular the Reinluftableitelements, from the unfiltered side of the filter insert, in particular the Reinluftableitelements, in a direction perpendicular to the longitudinal axis of the filter insert direction, in particular in the radial direction formed. The inflow-side end element is thus advantageously designed as a radial seal. In this case, seals a radial seal in at least one direction perpendicular to the flow direction of the air flow direction, in particular in the radial direction from. As a radial direction is present in the Direction of a straight line connecting the center of the filter medium to a point of the inflow-side end of the filter medium and the downstream end of the filter medium interconnecting lateral surface or outer wall of the filter medium designates. The axial direction is referred to herein as the direction of the longitudinal axis of the filter medium. Advantageously, the flow direction of the air flow runs along the longitudinal axis of the filter medium.

In addition to the inflow-side end element, a downstream end element can be arranged at the downstream end of the filter medium. This downstream end element is preferably formed analogously to the upstream end element. The downstream end member may be formed of the same material as the upstream end member and / or may have the same dimension as the upstream end member. The downstream end element can be arranged analogously to the upstream end element at the downstream end of the filter medium. Alternatively, the downstream end member may cover the entire surface of the downstream end of the filter cartridge. The downstream end element can form a sealing end of the filter element.

The inflow-side end element is preferably made of at least one elastic material, in particular of at least one elastic plastic, for example of at least one elastomer, for example of at least one P [oly] UR [ethane] elastomer, or of at least one thermoplastic elastomer, for example of at least one thermoplastic P [oly] UR [ethane] elastomer, formed. The formation of the upstream end element of elastic material has the advantage that this can serve as a sealing element itself. To provide a tight connection between the end plate and the filter medium so no further sealing means, such as an adhesive or a sealing element to be used.

Furthermore, by forming the inflow-side end element of elastic material, the inflow-side end element can serve as a resilient element. This is particularly advantageous if the inflow-side end element is involved in the holder or fixation of the filter medium in the housing of the air filter. Thus, an inflow-side end element formed from elastic material can serve, for example, for tolerance compensation in the case of production inaccuracies of the housing and / or of the filter insert.

In order to avoid a loss of stability of the filter medium, in particular in the case of large volume flows, the clean air discharge element is advantageously designed to stabilize the filter medium. In an advantageous embodiment, a grid structure or a conductor structure gives the clean air discharge element a special stability.

Advantageously, the inflow-side end element is formed from at least one foamed material, in particular from foamed P [oly] UR [ethane]. By the inflow-side end element of at least one foamable material, in particular from foamable P [oly] UR [ethane] is formed, and the inflow-side end element is foamed onto the filter medium and / or on the clean air discharge, is a particularly simple way a firm connection between the upstream end element and the filter medium and / or the clean air discharge element made.

The inflow-side end element is advantageously permanently or non-detachably connected to the clean air discharge element. For example, the inflow-side end element can be foamed onto the lattice structure or conductor structure of the clean air outlet element. The grid structure or conductor structure then stabilizes the upstream end element. Regardless of or in connection herewith, the inflow-side end element can be permanently or permanently connected to the filter medium.

The downstream end element may, for example in the same way as the inflow-side end element, be connected to the filter medium and / or to the support body in a fixed or non-detachable manner.

In order to facilitate the handling of the filter medium, the filter insert may comprise a handle element, which is designed for handling, in particular for gripping and holding, the filter insert.

Advantageously, the grip element extends axially away from the filter medium.

In an advantageous embodiment, the gripping element is arranged on the clean air discharge element, for example formed in one piece with the clean air discharge element. Particularly advantageously, the gripping element is arranged on an inflow-side base surface of the clean air outlet element extending perpendicular to the longitudinal axis of the filter insert. Alternatively, the gripping element can also be arranged on the upstream end element, as for example in the document EP 1 457 247 A1 is described.

The inflow-side end element is preferably arranged around the handle element. In this case, the inflow-side end element is advantageously in contact with the grip element, for example abuts on the grip element. The upstream side End element may be formed, for example, as a narrow ring, which surrounds the grip element and sealingly rests on the grip element.

Advantageously, the clean air discharge element and the filter element are cylindrical and the inflow-side end element is advantageously arranged concentrically with the clean air discharge element and with the filter medium.

The present invention further relates to an air filter according to claim 9.

In an advantageous embodiment of the invention, the lid of the air filter has at least one holding element, which is designed to cooperate with the gripping element of the clean air exhaust element such that the filter insert in the direction of its longitudinal axis (X) and in the direction of a first vertical (Y) to the longitudinal axis (X ) of the filter insert ( 100 ) in the filter housing ( 210 ) is fixed.

The holding element preferably extends from the housing in the direction of the center of the filter insert, ie in the horizontal or radial direction.

In order to fix the filter insert, the grip element can have a fastening element releasably connectable to the retaining element, in particular by means of a plug connection or by means of a clamping connection. This fastening element can be, for example, a web extending in the axial direction, which can be arranged in a recess of the retaining element which is open on one side, for example slot-like or wedge-like. The recess of the retaining element is advantageously designed such that the fastening element arranged in the recess is surrounded on three sides by the retaining element.

The inflow-side end element is advantageously designed to cooperate with the holding element of the lid such that the filter insert is fixed in the filter housing in a further direction perpendicular to the longitudinal axis of the filter insert and perpendicular to the first vertical.

For fixing the filter element, the inflow-side end element advantageously has a fixing element which extends up to a region of the housing opposite the holding element and in this way fixes the filter insert in the housing, in particular clamps or clamps it. The fixing element thus extends in the horizontal or radial direction to the housing. The fixing element is preferably arranged such that it forms an extension of the retaining element, as it were. The contact region of the housing with the fixing element of the upstream end element is thus advantageously opposite the region at which the retaining element is connected to the housing.

In an advantageous embodiment of the present invention, the filter housing can be opened and closed by a movement of the lid in the direction of the further, arranged perpendicular to the longitudinal axis of the filter insert and perpendicular to the first vertical direction. When the housing is closed, on the other hand, the holding element with the gripping element and the inflow-side end element interact with the holding element such that the filter insert is fixed in all directions of the space, in particular in the axial direction and in the radial direction, in the housing.

In the above embodiment, the filter element by means of, preferably arranged on Reinluftableitelement, for example, integrally formed with the Reinluftableitelement, handle member, the holding member and the upstream end member in the housing of the air filter can be fixed. When from the publication EP 1 457 247 A1 known air filter for mounting the filter insert in the housing of the air filter significantly more components needed, namely a secured with a clip connection to the housing clamping bracket 35 which is in a on the upstream end element 19 arranged handle element 20 engages and an axial stop element 26 (see. 1 of the EP 1 457 247 A1 ).

Brief description of the drawings

As already discussed above, there are various possibilities for embodying and developing the teaching of the present invention in an advantageous manner. For this purpose, reference is made on the one hand to the claims subordinate to claim 1 and claim 9, on the other hand, further embodiments, features and advantages of the present invention, inter alia, with reference to the. By 1 to 8th illustrated embodiment explained in more detail

It shows:

1 a first embodiment of an air filter according to the present invention;

2 a detailed view of the filter element of the air filter 1 wherein the lid of the housing is closed;

3 a detailed view of the filter element of the air filter 1 wherein the lid of the housing is opened;

4 a single view of the filter cartridge 1 ;

5 the filter insert off 4 without upstream end element;

6 a cross-sectional view of the filter cartridge 1 ;

7 an isometric single view of the filter cartridge off 1 ; and

8th a sectional view of the filter insert 1 along the in 6 shown line AA.

The same or similar embodiments, elements or features are in the 1 to 8th provided with identical reference numerals.

Embodiment (s) of the invention

At the in 1 The filter element shown is a two-stage air filter 200 or a two-stage separator for an internal combustion engine, namely for a tractor. The two-stage air filter 200 is designed for the separation of liquid and / or solid particles from an air stream to be cleaned, namely for cleaning the combustion air of the tractor. The orientation of the in 1 shown two-stage air filter 200 corresponds to the installation on the tractor.

• – einen als Vorfilter ausgebildeten (nicht dargestellten) Zyklonvorabscheider, der in einer ersten Stufe die Partikel aus dem Luftstrom abscheidet, indem er den Luftstrom in Rotation versetzt, und
• – einen in Strömungsrichtung des Gasstroms folgenden Filtereinsatz 100, nämlich ein Hauptfilterelement, ein sogenanntes Primärelement, das in einer zweiten Stufe die Partikel aus dem Luftstrom abscheidet, indem es die Partikel durch mindestens ein Filtermedium 10, nämlich einen gefalteten, stirnkantenverleimten Papierbalg, leitet.

The two-stage air filter 200 Has

• - Formed as a pre-filter (not shown) Zyklonvorabscheider which separates the particles from the air stream in a first stage by the air flow in rotation, and
• - A following in the flow direction of the gas flow filter cartridge 100 namely, a main filter element, a so-called primary element, which in a second stage separates the particles from the air stream by passing the particles through at least one filter medium 10 , namely a folded, paper edge-glued paper bladder, passes.

Because the cyclone pre-separator behind an inlet cover 230 , for example, is arranged in the form of a lattice structure, it is in 1 not visible.

In addition to the cyclone pre-separator and the filter insert 100 can the two-stage air filter 200 Furthermore, a (in the 1 to 8th not shown) downstream secondary element or fine filter element. The secondary element prevents when changing the main filter element 100 Dirt gets into the internal combustion engine.

The cyclone pre-separator and the filter cartridge 100 are in a filter housing 210 taken, the one behind the inlet cover 230 arranged raw-side inlet and a clean-side outlet 242 for the air flow to be cleaned. The air flows according to the dotted arrow direction directly into the Zyklonvorabscheider and is sucked in by this freely.

In the Zyklonvorabscheider there is a deflection of the air flow by 90 degrees, so that the air flow after leaving the Zyklonvorabscheiders axially on the main filter element 100 flows.

As in the present invention, the upstream end of the filter medium 10 at least one area 16 has, at which the air flow freely into the filter medium 10 the air can flow axially into the filter medium 10 plunge.

The filter medium 10 of the main filter element 100 is formed hollow cylindrical. The air flow to be cleaned flows through the filter medium 10 from the outside to the inside.

The purified air is passed through an inside of the filter medium 10 arranged clean air discharge element 30 namely, for stabilizing the filter medium 10 trained support tube or center tube, derived. To stabilize the filter medium 10 lies the middle tube 30 , in particular a lateral surface extending in the flow direction of the air flow 36 of the cylindrical center tube 30 , on the inner wall of the hollow cylindrical filter medium 10 at. The center tube 30 is concentric with the filter medium 10 arranged.

At an upstream surface 38 of the center tube 30 is a gripping element extending axially in the direction of the cyclone pre-separator 32 arranged. The grip element 32 serves to handle the main filter element 100 and together with a holding element 222 on the lid 220 of the filter housing 210 for fixing the main filter element 100 in the filter housing 210 (see in particular 2 ).

3 shows the holding element 222 and the filter cartridge 100 separates and represents how the holding element 222 in the handle element 32 of the filter insert 100 intervenes. The holding element 222 holds together with the handle element 32 the filter cartridge 100 in the axial direction and in the direction of a perpendicular to the axis of the filter cartridge.

At the cyclone pre-separator facing upstream side of the main filter element 100 is an upstream end element 20 , namely an upstream end plate, arranged. In contrast to in the publication EP 1 457 247 A1 described prior art, covers the upstream side end disk 20 not the entire area of the inflow side of the main filter element 100 but is only at a portion of the upstream side of the main filter element 100 arranged.

For example, as in the 1 to 6 represented, the inflow-side end element 20 at one to the filter medium 10 adjacent, circular area of the upstream surface 38 of the center tube 30 be arranged.

The upstream end disk 20 is formed from P [oly] UR [ethane]. P [oly] UR [ethane] has the advantage that it is an elastic material. Thus, the upstream Endscheibe 20 to compensate for tolerances, so the filter cartridge 100 despite tolerances of the dimension and / or orientation of the filter housing 210 or the handle element 32 or the cyclone pre-separator exactly in the filter housing 210 can be positioned and accurately with the cyclone pre-separator can be arranged.

A further advantage of an inflow-side end disk formed from elastic material, in particular from P [oly] UR [ethane] 20 is that this end disc 20 simultaneously seals and thus provides a radial sealing seat and no leaks can occur on the clean air side. The upstream end disk 20 can in this way to seal the clean air side of the center tube 30 from the raw air side of the center tube 30 be formed in the radial direction.

Advantageously, the inflow-side end plate 20 on the filter cartridge 100 frothed. So that the foamed material well on the center tube 30 adheres and stabilizes the upstream end disk 20 has the central tube 30 preferably a grid structure (cf. 5 ).

The filter insert 100 also has a for sealing the clean air side of the filter cartridge 100 from the raw air side filter element 100 trained downstream end element 22 , This downstream end element 22 is advantageously also formed from P [oly] UR [ethane].

The upstream end element 20 is for fixing the filter cartridge 100 in the filter housing 210 formed in the radial direction. Optionally, also the downstream end element 22 for fixing the filter cartridge 100 be formed in the radial direction.

In short form, in the in the 1 to 8th illustrated main filter element 100 described as follows: The main filter element 100 has a front edge glued filter medium 10 and a center tube 30 with two partial P [oly] UR [ethane] endplates 20 . 22 , which represent a clean air-side radial seal and a radial fixation. The center tube 30 additionally has a geometry, namely a handle element 32 which allows the main filter element 100 to grasp and fix in spite of merely glued front edges. With the handle element 32 becomes the main filter element 100 not only traded, but also, in conjunction with the lid 220 of the filter housing 210 , in the filter housing 210 positioned and fixed.

That in the 1 to 8th illustrated main filter element 100 has the advantage over the prior art that in particular by the front edge bonding, a lower delta p and better performance can be achieved and optimal use of the filter medium 10 can be implemented. Despite these glued front edges, the main filter element 100 radially in the filter housing 210 be fixed. In addition, the geometry of the handle element allows 32 easy handling and easy fixation of the main filter element 100 ,

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

• EP 1457247 B1 [0002, 0003]
• EP 1457247 A1 [0010, 0021, 0031, 0031, 0054]

Claims (10)

Filter element ( 100 ) for an air filter ( 200 ) for separating liquid and / or solid particles from an air stream to be cleaned, comprising - at least one filter medium designed for filtering the air stream ( 10 ) with an inflow-side end and an outflow-side end following the flow direction of the airflow, - a clean-air discharge element (8) designed to discharge the filtered air ( 30 ) with a circumferential surface extending in the flow direction of the air flow ( 36 ), this lateral surface ( 36 ) from the filter medium ( 10 ), and - a for sealing the clean air side of the filter cartridge ( 100 ) from the raw air side of the filter cartridge ( 100 ) formed upstream end element ( 20 ), characterized in that the upstream end of the filter medium ( 10 ) at least one area ( 16 ), at which the air flow freely into the filter medium ( 10 ) can flow. Filter insert according to claim 1, characterized in that the clean air discharge element ( 30 ) at least one grip element ( 32 ), which is designed for handling, in particular for gripping and holding, of the filter insert. Filter insert according to claim 1 or 2, characterized in that - the clean air discharge element ( 30 ) an inflow-side base surface extending perpendicular to the flow direction of the air flow ( 38 ), - the filter medium ( 10 ) the outer edge of the upstream surface ( 38 ) of the clean air exhaustion element ( 30 ) and - the upstream end element ( 20 ) at the upstream surface ( 38 ) of the clean air exhaustion element ( 30 ), in particular on one of the filter medium ( 10 ) adjacent area of the upstream surface ( 38 ) of the clean air exhaustion element ( 30 ) is arranged. Filter insert according to at least one of claims 1 to 3, characterized in that the upstream end element ( 20 ) of at least one elastic material, in particular of at least one elastic plastic, for example of at least one elastomer, for example of at least one P [oly] UR [ethane] elastomer, or of at least one thermoplastic elastomer, for example of at least one thermoplastic P [oly] UR [ethane] elastomer, is formed. Filter insert according to at least one of claims 1 to 4, characterized in that the upstream end element ( 20 ) is formed from at least one foamed material, in particular from foamed P [oly] UR [ethane]. Filter insert according to at least one of claims 1 to 5, characterized in that the clean air discharge element ( 30 ) has a grid-like or ladder-like structure. Filter insert according to at least one of claims 1 to 6, characterized in that the filter medium ( 10 ) is folded and has a Stirnkantenverleimung for sealing its fold ends. Filter insert according to at least one of claims 1 to 7, characterized by a for sealing the clean air side of the filter cartridge ( 100 ) from the raw air side filter element ( 100 ) formed downstream end element ( 22 ). Air filter ( 200 ) for separating liquid and / or solid particles from an air stream to be cleaned, in particular for cleaning the combustion air of an internal combustion engine, comprising a filter cartridge ( 100 ) according to at least one of claims 2 to 8 and a filter insert ( 100 ) enveloping filter housing ( 210 ) with one for opening and closing the filter housing ( 210 ) formed lid ( 220 ), the lid ( 220 ) at least one retaining element ( 222 ) which is designed with the handle element ( 32 ) of the clean air exhaustion element ( 30 ) cooperate in such a way that the filter cartridge ( 100 ) in the direction of its longitudinal axis (X) and in the direction of a first vertical (Y) to the longitudinal axis (X) of the filter cartridge ( 100 ) in the filter housing ( 210 ) is fixed. Air filter according to claim 9, characterized in that the upstream end element ( 20 ) is designed in such a way with the holding element ( 222 ) of the lid ( 220 ), that the filter cartridge ( 100 ) in a further, perpendicular to the longitudinal axis (X) of the filter cartridge ( 100 ) and perpendicular to the first vertical (Y) arranged, direction (Z) is fixed, in particular that the upstream end element ( 20 ) a fixing element ( 24 ), which extends up to a holding element ( 222 ) opposite region of the housing and in this way the filter cartridge ( 100 ) Fixed in the housing, in particular clamped or tightened.

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