NL2019062B1

NL2019062B1 - Exhaust gas filter

Info

Publication number: NL2019062B1
Application number: NL2019062A
Authority: NL
Inventors: Wilhelm Albert Gerard Johan Radstaak Theodorus; Messink Dik
Original assignee: Golden Lungs B V
Priority date: 2017-06-13
Filing date: 2017-06-13
Publication date: 2018-12-19
Also published as: WO2018231048A1

Abstract

An exhaust gas filter for a vehicle, comprising an elongated tubular housing (2) having opposing end closures (4,6), one of which comprises an inlet opening (8) whilst an opposing end closure (6) comprises an outlet opening (10). An inlet compartment (12) connects to the inlet opening (8) and an outlet compartment (14) connects to the outlet opening (10). A perforated inlet screen (16) separates the inlet and outlet compartment (12,14), wherein the outlet compartment (14) comprises filter compartments (18) for receiving filter material. A deflection plate member (20) is arranged in the inlet compartment (12) transverse to the inlet opening (8) and extends from a first wall part (2a) of the tubular housing (2) to a predetermined clearance distance (d) from an opposite second wall part (2b) ofthe tubular housing (2) for providing a gas passage (22) between the second wall part (2b) and deflection plate member (20).

Description

Field of the invention

The present invention relates to an exhaust gas filter, such as an exhaust gas filter for connection to an exhaust pipe of a vehicle.

Background art

US patent application US 2011/120101 A1 describes a cylindrical exhaust filter for connection to an exhaust pipe comprising an alternating arrangement of filter members comprising a solid filtering agent, such as charcoal, and heat dissipation members comprising a heat dissipation material. Each heat dissipation member is positioned between two filter members or between one filter member and an exhaust pipe. In turn each filter member is positioned between two heat dissipation members or between one heat dissipation member and the exhaust pipe. In operation the filter and heat dissipation members filter and cool, respectively, exhaust gas as it flows through the exhaust filter. The exhaust filter further comprises an exhaust filter member including a hollow body member with a central opening extending there through and two screens positioned at opposing ends of the central opening. The exhaust filter member can be used as the filter member and/or the heat dissipation member. When used as the filter member the solid filtering agent is positioned within the central opening between the two screens.

Summary of the invention

The present invention aims to provide an exhaust gas filter for a vehicle, wherein the exhaust gas filter provides higher filtering efficiency of pollutants within an exhaust gas and allows efficient use of filter material stored in the exhaust gas filter.

According to the present invention, an exhaust gas filter of the type defined in the preamble is provided comprising an elongated tubular housing having two opposing end closures, one of which end closures comprises an inlet opening whilst the opposing end closure comprises an outlet opening, an inlet compartment connected to the inlet opening for receiving exhaust gas to be filtered and an outlet compartment connected to the outlet opening for expelling filtered exhaust gas, and a perforated inlet screen separating the inlet compartment from the outlet compartment, and wherein the outlet compartment comprises one or more filter compartments for receiving a filter material, wherein the exhaust gas filter further comprises a deflection plate member arranged in the inlet compartment transverse to the inlet opening extending from a first wall part of the tubular housing to a predetermined clearance distance from an opposite second wall part of the tubular housing for providing an elongated gas passage between the second wall part and the deflection plate member.

According to the present invention the deflection plate member allows a flow of exhaust gas to be deflected and distributed within the inlet compartment before entering the outlet compartment. The deflection plate member is configured to deflect a gas flow through the elongated gas passage interposed between the deflection plate member and the second wall part of the tubular housing. As a result the exhaust gas traverses the perforated inlet screen over a greater effective (wider) area when entering the outlet compartment, thereby improving effective usage of the outlet compartment 14 and filter material stored therein but also to improve and facilitate cooling of the exhaust gas.

In an advantageous embodiment the exhaust gas filter further comprises a plurality of laterally spaced distribution plate members arranged parallel to one another between a lower edge of the deflection plate member and the second wall part of the tubular housing. Such parallel arrangement of plate members reduce turbulence and improve distribution of exhaust gases flowing through the gas passage without increasing drag significantly.

In an exemplary embodiment, the one or more distribution plate members are provided with a cutting edge facing the inlet opening, i.e. wherein one or more distribution plate members, or each of the distribution plate members, comprise a cutting edge that faces the inlet opening such that drag of incoming exhaust gases is further reduced.

Short description of drawings

The present invention will be discussed in more detail below, with reference to the attached drawings, in which

Figure 1 shows a three dimensional view of an exhaust gas filter according to an embodiment of the present invention; and

Figure 2 shows a cross section of an exhaust gas filter according to an embodiment of the present invention.

Detailed description of the embodiments

Figures 1 and 2 show a three dimensional view and a cross sectional view, respectively, of an embodiment of an exhaust gas filter 1 according to the present invention. In the embodiments shown, the exhaust gas filter 1 comprises an elongated tubular housing 2 having two opposing end closures 4, 6, wherein one of the end closures 4, i.e. a first end closure 4, comprises an inlet opening 8 whilst the opposing end closure 6, i.e. a second end closure 6, comprises an outlet opening 10.

In an exemplary embodiment the inlet opening 8 may be cylindrical and may be connected to e.g. an exhaust pipe of a vehicle or to a general flue gas outlet pipe from which pollutants are expelled. Although the depicted embodiment of the tubular housing 2 in Figure 1 comprises a rectangular cross section formed by a rectangular housing, the tubular housing 2 may have a circular cross section formed by e.g. a cylindrical housing. Moreover, an oval or elliptical cross section of the tubular housing 2 is also conceivable. In an advantageous embodiment the tubular housing 2 is made of stainless steel to prevent corrosion.

There is further provided an inlet compartment 12 connected to the inlet opening 8 for receiving exhaust gas to be filtered and an outlet compartment 14 connected to the outlet opening 10 for expelling filtered exhaust gas. A perforated inlet screen 16 is provided separating the inlet compartment 12 from the outlet compartment 14. As shown, the outlet compartment 14 comprises or encloses one or more filter compartments 18 for receiving a filter material for filtering exhaust gases flowing through the tubular housing 2.

The exhaust gas filter 1 of the present invention further comprises a deflection plate member 20 arranged in the inlet compartment 12 transverse to the inlet opening 8 and extends from a first wall part 2a of the tubular housing 2 to a predetermined clearance distance dfrom an opposite second wall part 2b of the tubular housing 2 for providing an elongated gas passage 22 between the second wall part 2b and the deflection plate member 20.

Based on the depicted rectangular box shaped embodiment of the tubular housing 2 in Figure 1, the first wall part 2a may be envisaged as an upper side panel of the tubular housing 2 and where the opposite second wall part 2b may be envisaged as a bottom side panel.

The deflection plate member 20 as used in the exhaust gas filter 1 allows a flow of exhaust gas to be deflected and distributed within the inlet compartment 12 before entering the outlet compartment 14. In operation, the deflection plate member 20 deflects a gas flow through the elongated gas passage 22 between the deflection plate member 20 and the second wall part 2b of the tubular housing 2, so that exhaust gas traverses the perforated inlet screen 16 over a greater effective (wider) area when entering the outlet compartment 14. For example, a substantially cylindrical inlet opening 8 will typically provide a concentrated stream of exhaust gas entering the inlet compartment 12, where upon deflection by the deflection plate member 20, the exhaust gas is forced through the elongated gas passage 22, thereby widening or enlarging the stream of exhaust gas. As a result the deflected stream of exhaust gas traverses through the inlet screen 16 over a larger effective area thereof, improving effective usage of the outlet compartment 14 and filter material but also to improve cooling of exhaust gas.

In an exemplary embodiment, the deflection plate member 20 is a non-perforated (i.e. uniform) flat plate member arranged transverse to the inlet opening 8 extending from the first wall part 2a (e.g. an upper side) to the predetermined clearance distance d from the opposite second wall part 2b (e.g. bottom side). Such a flat (uniform) plate member facilitates deflection and distribution of impinging exhaust gas flowing into the inlet compartment 12.

The filter material for the one or more filter compartments 18 may in advantageous embodiments be charcoal or activated charcoal, which when used in the exhaust gas filter 1 of the present invention, allows for a significant reduction of harmful and/or greenhouse gases such as carbon monoxide (CO) and/or carbon dioxide (CO2).

In an embodiment, the exhaust gas filter 1 further comprises a plurality of laterally spaced distribution plate members 24 arranged parallel to one another between a lower edge 20a of the deflection plate member 20 and the second wall part 2b of the tubular housing 2. The plurality of deflection plate members 24 reduce turbulence and improve the distribution of exhaust gas through the gas passage without substantially increasing drag. Drag can be further reduced by providing one or more distribution plate members 24 with a (sharp) cutting edge 24b facing the inlet opening 8. In an embodiment each of the distribution plate members 24 may be provided with a cutting edge 24b facing the inlet opening 8 for minimizing drag. It is conceivable that the plurality of deflection plate members 24 are provided as off-the-shelf utility knives (e.g. Stanley® knives) arranged between the lower edge 20a and the second wall part 2b, wherein a cutting edge 24b of the utility knives face the inlet opening 8.

As shown in Figure 2, in an embodiment the deflection plate member 20 extends diagonally or in a slanted/skewed fashion from the first wall part 2a of the tubular housing 2 toward the predetermined clearance distance d from the opposite second wall part 2b of the tubular housing 2. In this embodiment the diagonal/slanted deflection plate member 20 not only improves deflection and distribution of exhaust gas through the gas passage 22 but also reduces exhaust backpressure. In an exemplary embodiment the deflection plate member 20 extends diagonally at an angle a between 25° and 45° degrees to the end closure 4, i.e. the first end closure 4, comprising the inlet opening 8, which angle provides adequate deflection and distribution of exhaust gas as well as a reduction of backpressure without significantly lengthening the tubular housing 2.

Note that in an embodiment the deflection plate member 20 may extend diagonally or in a slanted/skewed fashion from the first wall part 2a of the tubular housing 2, wherein the first wall part 2a may also be envisaged as being a part, e.g. an upper part, of the first end closure 4.

In addition to the one or more filter compartments 18, an advantageous embodiment is provided wherein the inlet compartment 12 may comprise a further filter compartment 26 adjoining the inlet screen 16 for receiving a further filter material. This further filter material may also be (activated) charcoal or lava rock for example. In order to keep the further filter material within the further filter compartment 26, the clearance distance d may be chosen to be smaller than e.g. particle/block sizes of the filter material used. Also, the lateral arrangement of the plurality of distribution plate members 24, and in particular mutual distances there between, may be adapted to take into account the particular further filter material used for avoiding any such material from escaping the further filter compartment 26. Of course, apertures of the perforated inlet screen 16 may be adapted to avoid the further filter material from leaking there through.

When utilizing a diagonally arranged or slanted deflection plate member 20 as described above, the further filter material may be primarily confined to a part of the further filter compartment 26 that extends above/between the deflection plate member 20 as depicted in Figure 2 and the inlet screen 16. This is readily achievable by using larger pieces of charcoal or lava rock for example. The advantage of the elongated gas passage 22 is then that exhaust gases traverse a wider/larger area of further filter material such that the further filter material is used more efficiently.

Because temperatures of exhaust gases may be very high in particular applications, the filter material may need to be protected from excessive heat build-up and possibly combustion. To that end an embodiment is provided wherein the outlet compartment 14 further comprises one or more auxiliary compartments 19 each of which adjoins a filter compartment 18 of the one or more filter compartments 18, and wherein each of the one or more auxiliary compartments 19 is configured for cooling exhaust gases. In this embodiment excessive heat build-up in the exhaust gas filter 1 is avoided by an auxiliary compartment 19 adjoining a filter compartment 18, so that hot exhaust gases will not immediately flow into a subsequent, downstream filter compartment 18 but are allowed to cool before flowing through another filter compartment 18. In an exemplary embodiment an auxiliary compartment 19 may remain empty and comprise a hollow chamber, which further allows dirt and/or filter material particles and the like to be collected therein. In another exemplary embodiment an auxiliary compartment 19 may be filled with a suitable solid cooling material such that exhaust gas cooling may be further facilitated. In an advantageous embodiment the exhaust gas filter 1 comprises an alternating arrangement of a plurality of filter compartments 18 and auxiliary compartments 19, so that exhaust gas flows through a filter compartment 18 and subsequently through an auxiliary compartment 19 in alternating and successive fashion. Such alternating arrangement prevents the filter material, e.g. charcoal, from overheating as outlined above. Of course, in case no additional cooling for exhaust gases is required, then the one or more auxiliary compartments 19 may be configured as auxiliary filter compartments 19 that can be filled with the filter material as well, thereby increasing filter capacity of the exhaust gas filter 1.

The one or more filter compartments 18 and/or the one or more auxiliary compartments 19 may be separated from each other by using one or more baffle members. For example, in an embodiment the outlet compartment 14 comprises one or more baffle members 17 wherein each baffle member 17 comprises a baffle aperture 21 arranged therein. Such baffle members 17 may be spaced from one another along, for example, a centerline C of the tubular housing 2. Spaces on one or both sides of a baffle member 17 may then be designated as a filter compartment 18 or an auxiliary compartment 19, wherein each baffle aperture 21 allows for exhaust gas to flow through a corresponding baffle member 17. In an advantageous embodiment a baffle member 17 comprises a baffle plate made of uniform sheet material, e.g. a sheet of stainless steel, provided with a baffle aperture 21.

With reference to Figure 2, to allow for convenient assembly and disassembly of the exhaust gas filter 1, an embodiment is provided wherein the exhaust gas filter 1 comprises a releasable tie member 25, such as a tie rod, extending through the inlet and outlet compartment 12, 14 and clamping the compartments together, wherein the inlet compartment 12 and the outlet compartment 14 are releasable, separate components. This embodiment allows the exhaust gas filter 1 to be easily disassembled in case of maintenance, e.g. when filter material must be replaced. By removing the tie member 25, both the inlet and outlet compartment 12, 14 can be disengaged to provide accessibility to these compartments. Note that in a further embodiment the outlet compartment 14 comprises one or more filter compartments 18 and one or more auxiliary compartments 19 as outlined above. In this embodiment the tie member 25 would then extend through the filter compartments 18 and auxiliary compartments 19.

In an embodiment the tie member 25 may comprise opposite ends each of which is provided with a locking member 25a configured for clamping and securing the inlet compartment 12 and outlet compartment 14 together. In an exemplary embodiment the tie member 25 is a tie rod having opposite ends in threaded engagement with a corresponding locking member 25a, such as a locking nut or bolt. The threaded engagement allows convenient and controlled clamping of the inlet compartment 12 and outlet compartment 14.

In another embodiment the exhaust gas filter 1 may comprise a plurality of tie members 25, e.g. a plurality of tie rods, so that an evenly distributed clamping engagement between the inlet and outlet compartment 12, 14 is obtained. In a further embodiment each of the tie members 25 may then be arranged and distributed offset from a centreline C of the tubular housing 2 to optimize even clamping engagement.

In an advantageous embodiment, the exhaust gas filter 1 may further comprise one or more suspension members 27 mounted to a tie member 25, wherein the one or more suspension members 27 are configured for mounting the exhaust gas filter 1 to a vehicle for example. This embodiment allows the weight of the exhaust gas filter 1 to be evenly supported by the tie member 25 as it extends through the inlet compartment 12 and the outlet compartment 14. As depicted in Figure 2, a suspension member 27 may be arranged at each end of a tie member 25 and may be rigidly connected to the exhaust gas filter 1 through a locking member 25a, which both clamps the suspension member 27 to the tubular housing 2 as well as clamping the inlet and outlet compartments 12,14 together. Note that it is readily conceivable that suspension members 27 may be provided for a plurality of tie members 25 extending through the inlet and outlet compartment 12, 14.

With regard to efficient use of filter material, an embodiment is provided wherein the outlet compartment 14 comprises one or more baffle members 17 wherein each baffle member 17 comprises a baffle aperture 21 arranged at a lateral offset distance d₀ greater than zero from a centerline C of the tubular housing 2. This embodiment allows for varying placement of baffle apertures 21 with respect to the centreline C. Since a main gas flow component of exhaust gas through the exhaust gas filter 1 tends to be located near and/or at the centreline C of the tubular housing 2, the lateral offset distance d₀ may be utilized for increasing a flow path distance through the filter material in the one or more filter compartments 18.

To further increase efficient utilization of filter material, an embodiment is provided wherein the outlet compartment 14 comprises a plurality of baffle members 17 each comprising a baffle aperture 21 offset from or non-aligned with an adjacent baffle aperture 21. In this embodiment a plurality of baffle members 17 are provided such that adjacent baffle apertures 21 are non-aligned with respect to one another in e.g. a lengthwise direction of the tubular housing 2. Such a nonaligned or offset arrangement of adjacent baffle apertures 21 ensures that the flow path distance through a filter compartment 18 is increased, thereby improving efficient use of filter material. Note that in an exemplary embodiment a baffle member 17 may comprise a single baffle aperture 21, which may be laterally offset and/or non-aligned with respect to another baffle aperture 21 as outlined above.

For a rectangular tubular housing 2 as shown in Figure 1, or for a tubular housing 2 having at least in part one or more flat wall parts, the lateral offset distance do may extend from the centerline C in a direction perpendicular to a flat wall part of the tubular housing 2. In this embodiment the offset distance do may extend toward a flat side panel of a rectangular tubular housing 2, so that the one or more baffle apertures 21 are offset from the centreline C in a direction at substantially right angles to a flat wall part of the tubular housing 2. This embodiment facilitates centred placement of a baffle aperture 21 with respect to a flat side panel as measured from the centreline C. This would then improve efficient gas flow through the filter material in the one or more filter compartments 18 and/or through the one or more auxiliary compartments 19.

As further depicted in Figure 1, in an embodiment the one or more baffle apertures 21 are elongated baffle apertures 21a extending along a wall part of the tubular housing 2. This embodiment allows for an elongated baffle aperture 21a having a required size to extend in close proximity along a wall part of the tubular housing 2. For example, for a rectangular tubular housing 2 the elongated baffle aperture 21a may be formed as an elongated rectangular slot extending through a baffle member 17 along a straight wall part of the rectangular tubular housing 2 at a suitable offset distance d₀. Likewise, for a cylindrical tubular housing 2 the elongated baffle aperture 21a may be formed as a curved slot extending through a baffle member 17 along a curved wall part of the cylindrical tubular housing 2 at a suitable offset distance d₀.

The elongated baffle aperture 21a described above allows for a greater offset distance d₀since a required aperture size can be maintained by making the baffle aperture 21 wider but keeping its height limited, e.g. by having an aspect ratio substantially removed from 1:1, which is demonstrated in Figure 1 for the rectangular baffle aperture 21 shown.

As mentioned earlier, arranging baffle apertures 21 at a lateral offset distance d₀ from the centreline C of the tubular housing 2 allows filter material in a filter compartment 18 to be utilized more efficiently due to a lengthening of a gas flow path there through. Utilization rate of filter material can be further increased by an offset or non-aligned arrangement of adjacent baffle apertures 21, so that the gas flow path through a particular filter compartment 18 can be further lengthened by suitably chosen offset distances. Note that offset or non-aligned arrangement of adjacent baffle apertures 21 allows a gas flow path through an auxiliary compartment 19 to be increased as well so that e.g. thermal management of the exhaust gas filter 1 can be improved.

In an alternative embodiment, one or more baffle apertures 21 are triangular baffle apertures 21b having an edge 21c extending along a wall part of the tubular housing 2, thereby allowing for a non-linear area increase of the baffle aperture 21 as a function of a distance from e.g. the centreline C. This embodiment may be advantageous when dimensions of the tubular housing 2 are limited but maximum utilization of filter material is desired for limited offset distances d₀.

In an advantageous embodiment, one or more baffle apertures 21 are provided with a perforated aperture screen member 28, so that filter material such as (activated) charcoal is prevented from escaping a filter compartment 18. In a further advantageous embodiment, the perforated aperture screen member 28 is a perforated ceramic burner plate. This embodiment is advantageous for thermal management of the exhaust gas filter 1, as it has been found that using a perforated ceramic burner plate prevents excessive heat build-up within the exhaust gas filter 1 downstream from such a ceramic burner plate. In a specific embodiment the ceramic burner plate can be a soft ceramic burner plate, which are readily available as off-the-shelf components, thereby reducing manufacturing costs of the exhaust gas filter 1.

The perforated aperture screen member 28, or in particular the ceramic burner plate, can be secured to a baffle member 17 by providing the baffle member 17 with a flange member 23 arranged around the corresponding baffle aperture 21. In case the baffle member 17 is made of sheet material then the flange member 23 provides sufficient support to secure a perforated aperture screen member 28 to the baffle member 17.

In a further embodiment, the outlet opening 10 extends through a perforated outlet tube 30 that projects into the tubular housing 2. This embodiment allows for a filter compartment 18 to comprise the outlet opening 10, so that the perforated outlet tube 30 acts as a perforated screen member for preventing filter material from escaping the exhaust gas filter 1. In an embodiment the perforated outlet tube 30 terminates at a baffle member 17 and is connected thereto.

In view of the above description, the present invention can now be summarised by the following embodiments:

Embodiment 1. An exhaust gas filter for a vehicle, comprising an elongated tubular housing (2) having two opposing end closures (4,6), one of which end closures (4) comprises an inlet opening (8) whilst the opposing end closure (6) comprises an outlet opening (10), an inlet compartment (12) connected to the inlet opening (8) for receiving exhaust gas to be filtered and an outlet compartment (14) connected to the outlet opening (10) for expelling filtered exhaust gas, and a perforated inlet screen (16) separating the inlet compartment (12) from the outlet compartment (14), and wherein the outlet compartment (14) comprises one or more filter compartments (18) for receiving a filter material, wherein the exhaust gas filter (1) further comprises a deflection plate member (20) arranged in the inlet compartment (12) transverse to the inlet opening (8) extending from a first wall part (2a) of the tubular housing (2) to a predetermined clearance distance (d) from an opposite second wall part (2b) of the tubular housing (2) for providing an elongated gas passage (22) between the second wall part (2b) and the deflection plate member (20).

Embodiment 2. The exhaust gas filter according to embodiment 1, further comprising a plurality of laterally spaced distribution plate members (24) arranged parallel to one another between a lower edge (20a) of the deflection plate member (20) and the second wall part (2b) of the tubular housing (2).

Embodiment 3. The exhaust gas filter according to embodiment 2, wherein one or more distribution plate members (24) are provided with a cutting edge (24b) facing the inlet opening (8).

Embodiment 4. The exhaust gas filter according to any one of embodiments 1-3, wherein the deflection plate member (20) extends diagonally from the first wall part (2a) of the tubular housing (2) toward the predetermined clearance distance (d) from the opposite second wall part (2b) of the tubular housing (2).

Embodiment 5. The exhaust gas filter according to embodiment 4, wherein the deflection plate member (20) extends diagonally at an angle (a) between 25° and 45° degrees to the end closure (4) comprising the inlet opening (8).

Embodiment 6. The exhaust gas filter according to any one of embodiments 1-5, wherein the inlet compartment (12) comprises a further filter compartment (26) adjoining the inlet screen 16 for receiving a further filter material.

Embodiment 7. The exhaust gas filter according to any one of embodiments 1-6, wherein the outlet compartment (14) further comprises one or more auxiliary compartments (19) each of which adjoins a filter compartment (18) of the one or more filter compartments (18), and wherein each of the one or more auxiliary compartments (19) is configured for cooling exhaust gases.

Embodiment 8. The exhaust gas filter according to any one of embodiments 1-7, wherein the outlet compartment (14) further comprises one or more baffle members (17), wherein each baffle member (17) comprises a baffle aperture (21) arranged at a lateral offset distance (do) greater than zero from a centerline (C) of the tubular housing (2).

Embodiment 9. The exhaust gas filter according to embodiment 8, wherein the outlet compartment (14) comprises a plurality of baffle members (17) of which each baffle aperture (21) is offset from an adjacent baffle aperture (21).

Embodiment 10. The exhaust gas filter according to embodiment 8 or 9, wherein the lateral offset distance (do) extends from the centerline (C) in a direction perpendicular to a flat wall part of the tubular housing (2).

Embodiment 11. The exhaust gas filter according to any one of embodiments 8-10, wherein one or more baffle apertures (21) are elongated baffle apertures (21a) extending along a wall part of the tubular housing (2).

Embodiment 12. The exhaust gas filter according to any one of embodiments 8-10, wherein one or more baffle apertures (21) are triangular baffle apertures (21b) having an edge (21c) extending along a wall part of the tubular housing (2).

Embodiment 13. The exhaust gas filter according to any one of embodiments 8-12, wherein one or more baffle apertures (21) are provided with a perforated aperture screen member (28).

Embodiment 14. The exhaust gas filter according to embodiment 13, wherein the aperture screen member (28) is a perforated ceramic burner plate.

Embodiment 15. The exhaust gas filter according to any one of embodiments 1-14, wherein the outlet opening extends (10) through a perforated outlet tube (30) which projects/protrudes into the tubular housing (2).

The present invention has been described above with reference to a number of exemplary embodiments as shown in the drawings. Modifications and alternative implementations of some parts or elements are possible, and are included in the scope of protection as defined in the appended claims.

Claims

CONCLUSIONS

An exhaust gas filter for a vehicle, comprising an elongated tubular housing (2) with two opposite end seals (4, 6), one end seal (4) of which comprises an inlet opening (8) and the opposite end seal (6) an outlet opening (10);

an inlet compartment (12) connected to the inlet opening (8) for receiving exhaust gas to be filtered and an outlet compartment (14) connected to the outlet opening (10) for ejecting filtered exhaust gas;

a perforated inlet grille (16) separating the inlet compartment (12) from the outlet compartment (14), and wherein the outlet compartment (14) comprises one or more filter compartments (18) for receiving a filter material, the exhaust gas filter (1) further comprises deflection plate part (20) arranged in the inlet compartment (12) and transversely of the inlet opening (8), the deflection plate part (20) extending from a first wall part (2a) of the tubular housing (2) to a predetermined free distance (d) from an opposite second wall part (2b) of the tubular housing (2) for providing an elongated gas passage passage (22) between the second wall part (2b) and the deflection plate part (20).

The exhaust gas filter according to claim 1, further comprising a plurality of laterally spaced distribution plate parts (24) arranged parallel to each other between a lower edge (20a) of the deflection plate part (20) and the second wall part (2b) of the tubular housing (2).

The exhaust gas filter according to claim 2, wherein one or more distribution plate parts (24) are provided with a cutting edge (24b) that faces the inlet opening (8).

The exhaust gas filter according to any of claims 1-3, wherein the deflection plate part (20) extends diagonally from the first wall part (2a) of the tubular housing (2) to the predetermined free distance (d) with respect to the opposite second wall part (2b) of the tubular housing (2).

The exhaust gas filter according to claim 4, wherein the deflection plate part (20) extends diagonally at an angle (a) of 25 ° to 45 ° degrees with the end seal (4) comprising the inlet opening (8).

The exhaust gas filter according to any of claims 1-5, wherein the inlet compartment (12) comprises a further filter compartment (26) adjacent to the inlet grille (16) for receiving a further filter material.

The exhaust gas filter according to any of claims 1-6, wherein the outlet compartment (14) further comprises one or more auxiliary compartments (19) with each bucket compartment (19) adjacent to a filter compartment (18) of the one or more filter compartments (18) and wherein each of the one or more auxiliary compartments (19) is adapted to cool exhaust gases.

The exhaust gas filter according to any of claims 1-7, wherein the exhaust compartment (14) further comprises one or more screen members (17), wherein each screen part (17) comprises a screen opening (21) arranged at a lateral displacement distance (do) which is greater than zero from a center line (C) of the tubular housing (2).

The exhaust gas filter according to claim 8, wherein the exhaust compartment (14) comprises a plurality of screen members (17), each screen opening (21) of which is offset from an adjacent screen opening (21).

The exhaust gas filter according to claim 8 or 9, wherein the lateral displacement distance (d ₀ ) extends from the center line (C) in a direction perpendicular to a flat wall portion of the tubular housing (2).

The exhaust gas filter according to any of claims 8-10, wherein one or more screen openings (21) are elongated screen openings (21a) extending along a wall portion of the tubular housing (2).

The exhaust gas filter according to any of claims 8-10, wherein one or more screen openings (21) are triangular screen openings (21b) with an edge extending! along a wall part of the tubular housing (2).

The exhaust gas filter according to any of claims 8-12, wherein one or more screen openings (21) are provided with a perforated opening screen part (28).

The exhaust gas filter according to claim 13, wherein the opening screen portion (28) is a perforated ceramic burner bed.

The exhaust gas filter according to any of claims 1-14, wherein the outlet opening (10) extends through a perforated outlet pipe (30) projecting into the tubular housing (2).

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