WO2008043610A1

WO2008043610A1 - Filter unit, particularly for filtering combustion air in internal combustion engines

Info

Publication number: WO2008043610A1
Application number: PCT/EP2007/059290
Authority: WO
Inventors: Stefan Walz; Michael Durst
Original assignee: Mann+Hummel Gmbh
Priority date: 2006-10-12
Filing date: 2007-09-05
Publication date: 2008-04-17
Also published as: DE202006015783U1; DE112007002065A5

Abstract

The invention relates to a filter unit which comprises a filter tube chamber in a filter housing for accepting at least one filter tube. The filter tube chamber is constructed as an enclosed chamber with at least one flow opening in an outer wall.

Description

1/14 VSS 2813

description

Filter device, in particular for the filtration of combustion air in

Internal combustion engine TECHNICAL FIELD The invention relates to a filter device, in particular for

Filtration of air in vehicles, such as combustion air in

Internal combustion engines or vehicle interior air, according to the preamble

of claim 1.

State of the art

In WO 2005/095783 A1, an intake air filter for a

Internal combustion engine described, the sucked and the engine

subjected to a supply of combustion air to be filtered. The air filter

includes several filter bags, which are arranged in the engine compartment and from

a cover are covered. The filter bags consist of one

flexible filter fleece and are from the combustion air from the

Surrounding flows radially from outside to inside, so that the

Outside of the filter bags the crude side and the interior the

Reinseite represents over which the purified combustion air the

Cylinder inlets of the internal combustion engine is supplied. The

Filter hoses are with one of its two axial end faces to a

Air collecting box connected to the cylinder inlets

communicated.

Disclosure of the invention 2/14 VSS 2813

Based on this prior art, the present invention seeks to provide a simple structure, robust and protected against external influences filter device, which is characterized by a high filtration performance and the filter element can be easily replaced.

This object is achieved with the features of claim 1. The dependent claims indicate expedient developments.

The filter device according to the invention, which is designed for the filtration of particular gaseous fluids such as the combustion air in internal combustion engines, optionally also a filtration of liquids into consideration, comprises a box-like housing in which at least one, but in particular a plurality of filter elements are included which are each designed as filter bags. Advantageously, the filter housing on the one hand on a filter tube space in which the at least one filter tube is received, and on the other hand, a fluid receiving space which is separated from the filter tube space via a partition wall. According to the number of recorded in the filter hose chamber filter hoses connecting openings between the spaces are introduced into this partition, to each of which a filter hose is connected. About other flow openings in the outer walls of both the filter tube space and the fluid receiving space is a 3/14 VSS 2813

Communication with the environment or other housing parts or connecting pipes possible. The dividing wall between the filter hose space and the fluid receiving space separates the raw from the clean side, whereby depending on the design of each of the two rooms the raw side and the other room can be the clean side. Since the filter bags are enclosed in the filter tube space, they are protected against external influences, in particular against mechanical damage and against contamination and moisture. According to a preferred embodiment, the filter tube space forms the raw side into which the fluid to be cleaned is introduced via the flow opening in the outer wall. The uncleaned fluid spreads in the filter tube space and penetrates the filter walls of the filter tubes radially from outside to inside. The interior of the filter tubes in this embodiment represents the clean side, which communicates via the frontal opening in the filter tube and the connection opening in the partition with the fluid receiving space, which is also part of the clean side of the filter device. If a plurality of filter bags are provided, the cleaned fluid is collected from all the filter bags in the fluid receiving space and then discharged via the outside flow opening for further use. 4/14 VSS 2813

In addition to the protection against mechanical and weather influences, the filter device according to the invention offers the advantage of a modular construction. In the event that several filter bags are accommodated in the filter housing, single or all filter bags can be replaced for maintenance purposes, for which only the filter tube space must be opened and one or more of the filter bags must be removed. The filter hoses represent individual modules within the entire filter device.

Another advantage is the high filtration performance. That in the

Filter tube space introduced raw fluid spreads evenly and can penetrate the walls of the filter tubes uniformly radially from outside to inside. In the filter tube space a plurality of such filter bags can be provided.

The advantage of high cleaning performance remains even at a

Received flow in the opposite direction, in which the raw fluid is introduced through the fluid receiving space and from there into the interior of the filter bags, from where the fluid propagates radially through the filter walls to the outside and is filtered. In this case, the fluid receiving space represents the raw side and the filter tube space the clean side, in which the purified fluid is collected and discharged through the flow opening in the outer wall. 5/14 VSS 2813

Another advantage is the ability to use common parts. For example, the total cleaning performance is determined by the number of filter bags, which are located in the filter device, wherein the filter bags can be made identical to each other.

Another advantage is that in case of maintenance of the filter device no accidental contamination of the clean side is to be feared. For maintenance purposes, the filter bags are removed from the filter hose chamber and replaced with cleaned or new filter bags. Since the dividing wall separates the raw side from the clean side and the filter hoses are positioned exclusively on one side of the dividing wall, the fluid receiving space remains unimpaired by the change of the filter hoses.

Suitably, the filter material from which the filter bags are made of a soft and resilient material such as fleece and is made of synthetic materials, in particular polymer-based, optionally also of natural materials, such as cellulose-based. Alternatively, the material of the filter bags is stiff to prevent packaging. The filter bags can either have smooth, even walls or, according to an advantageous and preferred embodiment, have folds, whereby the filter surface of each 6/14 VSS 2813

Filter tube can be significantly increased. Such folds are oriented either exclusively in the longitudinal or in the circumferential direction or, according to a further preferred embodiment, the fold edges can enclose an angle relative to the filter longitudinal axis, that is to say run obliquely in the circumferential direction. In particular, the embodiments with folds in the circumferential direction have in common that the filter bags are characterized by a high degree of flexibility and in particular in the transverse direction transversely to the longitudinal axis are flexible. The design with folds whose fold edges are at an angle to the filter longitudinal axis, moreover, has a particularly high degree of stability, without affecting the flexibility in the transverse direction. In addition, an accordion effect is achieved via the folds, which has the consequence that an axial or radial deflection of the filter tube does not result in a permanent deformation; rather, the filter tube returns to its original size and shape as soon as external forces are removed. The filter bags preferably have a cylindrical or hollow cylindrical shape, in which the cross section remains the same over the axial length. But are also possible deviations thereof, for example, a conical shape or different axial sections with different inner and / or outer diameters. 7/14 VSS 2813

The filter bags expediently extend horizontally or at least approximately horizontally in the filter housing. To ensure that the filter bags do not sag or hang by their own weight, it may be appropriate to provide support means on the filter bags. Such support means consist for example of a support grid, which is connected to the wall of the filter bags. But also possible are support devices that support the filter bags against an inner wall of the filter tube space. Such support measures are particularly useful in the event that the filter bags are attached only to an axial end face, namely on the partition wall between fluid receiving space and filter tube space, whereas the opposite axial end can hang freely in space. As an alternative embodiment, however, an attachment of the opposite end wall of the partition on the adjacent inner wall of the filter tube space comes into consideration. Optionally, it is also possible to dispense with supporting measures as well as attachment to the inner wall of the filter hose space, provided that the filter bags have a sufficiently high intrinsic stability, which is the case in particular in the embodiment with folds with inclined fold edges.

Brief description of the drawings 8/14 VSS 2813

Further advantages and expedient embodiments are the further

Claims, the description of the figures and the drawings

remove. Show it:

Fig. 1 is a schematic representation of a filter device with

a box-like filter housing having a filter tube space with

several horizontally extending filter bags and one of them

Having separated by a partition fluid receiving space,

FIG. 2 shows a perspective view of a filter hose for

Use in the filter device, wherein the filter bag a variety

has folds in the filter wall, the partially sloping

Have fold edges, based on the longitudinal axis of the

Filter hose.

Embodiments of the invention

The filter device 1 shown in Fig. 1 is in particular for filtration

provided by combustion air in internal combustion engines, they can

but also in general for the filtration of gases and

optionally also be used by liquids. The

Filter device 1 comprises a box-like filter housing 2, in which a

Filter hose chamber 3 and one thereof separated via a partition wall 8

Fluid receiving space 4 are introduced. Act as filter elements

Filter hoses 5, 6 and 7, which are arranged in the filter hose chamber 3.

The filter bags 5, 6 and 7 are respectively at the partition 8 between 9/14 VSS 2813

Filter tube space 3 and fluid receiving space 4 held and connected to connecting openings 9, 10 and 11, which are introduced into the partition 8. Each filter hose 5, 6 and 7 extends horizontally in the filter hose chamber 3, wherein the end wall facing away from the partition wall either free hanging in space, as is the case with the filter bags 5 and 7, or is attached to an opposite wall, in particular In this wall 15, a flow opening 12 is introduced, via which the fluid to be cleaned in the filter hose chamber 3 is introduced. Another flow opening 13 is located in an outer wall of the fluid receiving space 4, via this flow opening 13, the purified fluid is discharged. The filter tube space 3 represents the raw side. The inflowing fluid spreads in the filter tube space 3 and flows radially from outside to inside through the filter wall of each filter tube 5 to 7. Inside each filter tube, the cleaned fluid is axially through the connection openings 9, 10 and 11 derived in the partition 8 and guided into the fluid receiving space 4, which is the clean side. In the fluid receiving space 4, the purified fluid is collected from all the filter bags and finally discharged through the outer flow opening 13 and supplied for further use. 10/14 VSS 2813

The filter bags can be made either cylindrical, as is the case with the filter bags 5 and 6, or also have a different geometry, for example, be conical, which is the case with the filter tube 7. Furthermore, support means may be provided to hold the filter bags in their horizontal position and to stabilize in their parallel position. As a support means, for example, a support grid 16 into consideration, which is introduced into the filter tube 5. But is also possible a support means in the form of a support leg 17, which is shown with reference to the filter bag 7.

In addition, a baffle 14 is introduced into the filter tube space 3, at which the fluid flow supplied via the flow opening 12 bounces off first and undergoes a deflection. This baffle 14 has flow openings or does not extend over the entire cross section of the filter tube space 3, to allow flow communication between the flow opening 12 and the space with the filter bags 5 to 7. If appropriate, the baffle 14 can also serve as a support wall to which the axial end faces of the filter bags are fastened.

The filter tube space 3 can be opened, for example by

Open the cover of the filter housing to replace the filter bags 5, 6 and 7 can. 11/14 VSS 2813

In Fig. 2, a filter tube 5 is shown in individual representation. Of the

Filter tube 5 is designed as a pleated filter and has a plurality of over the axial length and circumferentially extending folds 19. Some of these folds have fold edges 20, which enclose an angle with respect to the longitudinal axis 18 - or a longitudinal center plane - which deviates in particular from 90 °. These obliquely extending fold edges give the filter tube 5 a bellows-shaped structure, whereby the stability is increased while maintaining high flexibility in the longitudinal and radial directions.

The filter device is particularly suitable for the filtration of combustion air in internal combustion engines. However, it is also an application for the filtration of the vehicle interior air or in general for the filtration in vehicles possible.

The flow through the filter bags or can be done both radially from inside to outside and radially from outside to inside. The filter bags can additionally or alternatively to the horizontal arrangement also run vertically, obliquely or curved in the filter tube space. The support device on the filter hose can be arranged both on the inside and on the outside or optionally integrated in the wall. The wall of the filter tube can be formed smooth, axially folded or radially folded.

Claims

12/14 VSS 2813 Claims

1. filter device, in particular for the filtration of air in vehicles,

For example, combustion air in internal combustion engines or

Vehicle interior air, with a trained as a filter tube (5, 6, 7)

Filter element whose filter wall radially from the clean side

separated, characterized in that in a filter housing (2) of

Filter device (1) a filter tube space (3) for receiving at least

a filter tube (5, 6, 7) is located, wherein the filter tube space (3) as

enclosed space is formed, the at least one flow opening

(12) in an outer wall.

2. Filter device according to claim 1, characterized in that in the

Filter housing (2) with respect to the filter tube space (3) by a

Dividing wall (8) separated fluid receiving space (4) is located, wherein the

Filter hose space (3) and the fluid receiving space (4) each as

enclosed spaces are formed, each having at least one

Have flow opening (12, 13) in an outer wall, and that the

at least one filter hose (5, 6, 7) with an axial end face to a

Connection opening (9, 10, 11) in the partition (8) between

Filter tube space (3) and fluid receiving space (4) is connected.

3. Filter device according to claim 1 or 2, characterized in that in

Filter tube space (3) a plurality of filter bags (5, 6, 7) are added. 13/14 VSS 2813

4. Filter device according to one of claims 1 to 3, characterized in that the filter tube (5, 6, 7) is arranged horizontally in the filter tube space (3).

5. Filter device according to one of claims 1 to 4, characterized in that the filter hose (5, 6, 7) is arranged a support means.

6. Filter device according to claim 5, characterized in that the support means as a support grid (16) in or on the filter wall of the filter bag (5, 6, 7) is formed.

7. Filter device according to one of claims 1 to 6, characterized in that the filter tube (5, 6, 7) is cylindrical.

8. Filter device according to one of claims 1 to 7, characterized in that the filter tube (5, 6, 7) is conical.

9. Filter device according to one of claims 1 to 8, characterized in that the partition (8) opposite one end face of the filter bag (5, 6, 7) freely in the filter hose chamber (3) depends, in particular the partition wall (8) opposite end face the filter bag (5, 6, 7).

10. Filter device according to one of claims 2 to 9, characterized in that the partition (8) opposite end face of the filter tube (5, 6, 7) is held on a wall of the filter tube space (3). 14/14 VSS 2813

11. Filter device according to one of claims 2 to 10, characterized in that the filter hose space (3) the raw side and the fluid receiving space (4) forms the clean side.

12. Filter device according to one of claims 1 to 11, characterized in that in the filter hose space (3) adjacent to the flow opening (12) in the outer wall (15) a baffle wall (14) is arranged.

13. Filter device according to one of claims 1 to 12, characterized in that the filter tube (5, 6, 7) consists of segments, for example of straight segments, of elbows or conical segments.

14. Filter device according to one of claims 1 to 13, characterized in that the filter tube (5, 6, 7) is detachably connected to the partition wall (8), for example via a clip, a bayonet lock, or a screw connection.