KR101982979B1 - Exhaust gas purification device, exhaust line comprising such device - Google Patents

Abstract

The present purifier (1)
- a first purifying member (20) comprising a first envelope (28);
- a second purifying member (24) comprising a second envelope (34);
- a volume (40) fluidly connecting the first outlet (32) to the second inlet (36)
, And the first purifying member (20) and the second purifying member (24) are arranged substantially parallel to each other.
The volume 40 is defined by a crucible cover 92 that is directly coupled to the first outer envelope 28 and the second outer envelope 34.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an exhaust gas purifying apparatus, an exhaust gas purifying apparatus,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally relates to an exhaust gas purifying apparatus.

More specifically, the present invention relates to an exhaust gas purifying apparatus for a vehicle,

A first purifying member comprising a first exhaust gas inlet and a first exhaust gas inlet and a first exhaust gas purifying substrate accommodated in said first envelope, Circulating in the first substrate along one direction;

A second purifying member comprising a second exhaust gas inlet and a second exhaust gas inlet defining a second exhaust gas outlet and a second exhaust gas purifying substrate housed in said second envelope, Circulating in the second substrate along a second direction substantially opposite;

- a volume for fluidly connecting said first outlet to said second inlet

And the first purifying member and the second purifying member are disposed substantially parallel to each other in parallel with each other.

Such a purifier having a U-shaped architecture is often used at the edge of a vehicle equipped with an engine with a rearward outlet. This is placed in the engine compartment.

1 and 2 show a U-shaped purifier according to the prior art. The first substrate 2 and the second substrate 4 are cylindrical blocks having a circular section perpendicular to the first direction and the second direction. The outlet of the first purifying member is connected to the inlet of the second purifying member by a volume 6 formed by a lunette 8 and a cover 10. The rounette 8 is a plate including two orifices 12, 14 of circular cross section, to which the first and second purifying members are fixed. The orifices 12 and 14 are defined by the color shown in Fig.

The inlet of the first purifying member is defined by the inlet cover 15 shown in Fig.

The constraint on the occupied volume of the elements disposed near the engine block is becoming increasingly severe. In this situation, the present invention aims to propose a more compact purification apparatus.

To this end, the present invention is directed to the above-described purifier characterized in that the volume is defined by a crucible cover directly coupled to the first outer envelope and the second outer envelope.

Here, direct fixation or direct attachment means that the cover is not fixed to a lozenge-like piece such as the piece 8 shown in Figure 1, i.e. it is fixed to the first envelope 28 and the second envelope 34 . Since there is no lunate type piece, the first purifying member 20 and the second purifying member 24 can be brought close to each other, thereby making the purifying device much more compact. The cover is also smaller. Since there is no looper and the cover is smaller, the purifier can be made lightweight and thermal inertia of the apparatus can be reduced. Also, since the number of connections is reduced, the number of weld seams can be reduced.

The dimensions of the linen-type piece, in particular the spacing between the inlet and the outlet, are constrained by the prior art of FIGS. 1 and 2, since the material must be sufficiently provided to form the collar surrounding the inlet and outlet.

The purifier may also have one or more of the following features that are considered individually or in all possible technical combinations.

The cover has a bottom portion and a circumferential edge having a closed contour protruding relative to the bottom portion, the circumferential edge having a free edge directly fixed to the first outer envelope and the second outer envelope.

The free edge has a shape obtained by rotating a bus along a directional curve having a closed contour, the busbar being substantially parallel to the first and second directions, Direction and a plane perpendicular to the second direction.

Said free edge internally defining an opening having a predetermined area perpendicular to said first direction, said first outlet having a first area perpendicular to said first direction, said second inlet having a second area perpendicular to said first direction, And a second area perpendicular to the second direction, wherein a sum of the first area and the second area is substantially equal to the predetermined area.

The first purging member and the second purging member together define a continuous outer end face having a closed contour towards the volume and the free edge is in combination with the shape of the outer face.

The outer end face is tubular.

The first envelope includes a first circumferential wall having a first central segment surrounding the first substrate and a downstream first end extending the first central segment toward the volume.

The second envelope includes a second circumferential wall having a second center segment surrounding the second substrate and an upstream second end extending the second center segment toward the volume.

The downstream first end and the upstream second end together define the end surface.

The cover is integral.

The first envelope includes a first perimeter wall that completely surrounds the first substrate, taking into account the direction perpendicular to the first direction.

The second envelope includes a second perimeter wall that completely surrounds the second substrate, considering the direction perpendicular to the second direction.

The first peripheral wall and the second peripheral wall are separate from each other and have a first end downstream and a second end upstream defining the first outlet and the second inlet, respectively.

- a first end downstream and a second upstream end having respective first and second segments attached to each other.

The first segment and the second segment are straight.

The downstream first end and the upstream second end each having a first circumferential length and a second circumferential length, wherein the first segment and the second segment are each at least 15% of the first circumferential length, Lt; RTI ID = 0.0 > 10% < / RTI >

The first circumferential wall and the second circumferential wall each having a first center segment and a second center segment located at a distance from the downstream first end and the upstream second end along the first and second directions, Wherein the downstream first end and the upstream second end have a first cross section perpendicular to the first and second directions and larger than the cross sections of the first and second center segments, 2 cross section.

The purifying device includes a single perimeter wall having a closed contour completely surrounding the first substrate and the second substrate, considering the direction perpendicular to the first direction.

The single circumferential wall has an end which simultaneously defines the first outlet and the second inlet, and the cover is fixed directly to the end.

According to another aspect, the present invention relates to an exhaust line comprising a purifier having the features described above.

Other features and advantages of the present invention will become apparent from the following detailed description, which is given by way of illustration and not limitation, with reference to the accompanying drawings.
1 is a schematic cross-sectional view of a purifier according to the prior art;
Fig. 2 is a front view of the purifier of Fig. 1, in which the cover is not shown so that the loinette is visible. Fig.
3 is a perspective view of an apparatus according to a first embodiment of the present invention;
4 is a partial cross-sectional view of the apparatus of Fig. 3;
5 is a partial perspective view of the device of Fig. 3, with the cover not shown. Fig.
6 is a rear elevational view of the apparatus of Fig. 3, in which the cover defining the inlet and outlet of the apparatus is not shown. Fig.
7 is a front view similar to that of FIG. 6 of a clarification device according to a second embodiment of the present invention;
8 is an enlarged view of a section of the purifier according to a modification of the second embodiment;
9 is a view similar to the view of FIG. 8, in accordance with another embodiment of the second aspect of the present invention.
10 and 11 are front views showing another embodiment of the present invention.
12 is a perspective view of a purging apparatus showing another embodiment of the present invention.
13 is a partial cross-sectional view of the purifier of FIG. 12;
14 is a perspective view similar to FIG. 12, with the outer cover not shown so that the inner cone is visible; FIG.
- Figure 15 is a side view of the purging device of Figure 12, including partial cross-section.
16 is a detail enlarged view of FIG. 13 showing an embodiment of the present invention.

The purifier 1 shown in Fig. 3 is for purifying the exhaust gas of a vehicle equipped with a heat engine, such as a vehicle, typically a passenger car or a truck. The purifier 1 is designed to be integrated into an exhaust line. Which is connected upstream to the collector for collecting the exhaust gas discharged from the combustion chamber of the thermal engine and to the channel which can discharge the purified exhaust gas to the atmosphere in the downstream direction. The trap and channel are not shown. Other equipment, such as a turbo compressor, is typically inserted between the purifier and the collector. Other equipment, such as a silencer, is inserted between the purifier and the channel.

The purifier 1 includes an exhaust gas inlet 16 in fluid communication with an upstream portion of the exhaust line and an outlet 18 of exhaust gas in fluid communication with a downstream portion of the exhaust line.

Wherein upstream and downstream are understood relative to the normal circulation direction of the exhaust gas.

The purifier may further comprise:

A first purifying member 20 comprising a first exhaust gas purifying substrate 22 (Fig. 4) (the exhaust gas is supplied to the first substrate 22 along the first direction D1 shown in Fig. 4) Circulation];

- a second purifying member (24) comprising a second exhaust gas purifying substrate (26), said exhaust purifying member (24) along a second direction (D2) (FIG. 4) substantially opposite said first direction (26)]

.

The first direction D1 and the second direction D2 are parallel and opposite to each other. In a variant, these directions are slightly inclined with respect to each other.

In the following description, a direction parallel or substantially parallel to the first direction and the second direction is referred to as a longitudinal direction.

The first purifying member 20 includes a first outer envelope 28 that defines a first exhaust gas inlet 30 into the first purifying member and defines a first exhaust gas outlet 32 from the first purifying member ).

Likewise, the second purifying member 24 includes a second exhaust gas outlet 36 defining a second exhaust gas inlet 36 into the second purifying member and a second exhaust gas outlet 38 defining a second exhaust gas outlet 38 from the second purifying member. And an envelope 34.

The first substrate 22 and the second substrate 26 are received within the first envelope 28 and the second envelope 34, respectively.

The purifier 1 also includes a volume 40 for fluidly connecting the first outlet 32 to the second inlet 36.

As shown in the figure, the first purifying member 20 and the second purifying member 24 are disposed substantially parallel to each other. Thus, the first purging member and the second purging member have respective central axes parallel to each other, and these central axes are typically longitudinal, i.e., parallel to the first and second directions.

The central axis of the first purging member is defined as an axis passing through the centers of all the straight sections of the first purging member, and these straight sections are perpendicular to the first direction. Similarly, the central axis of the second purging member corresponds to an axis passing through the centers of all the straight cross-sections of the second purging member, and these straight cross-sections are taken perpendicular to the second direction.

The first purifying member and the second purifying member are arranged such that the first surface 42 of the first substrate 22 and the second surface 44 of the second substrate 26 are opposed to each other, As shown in Fig.

According to an aspect of the present invention, the first substrate 22 has a first cross-section perpendicular to the first direction and having a first circumference, the first surface 42 has a first cross- And a first width of 7% to 50% of the first perimeter.

The second substrate 26 has a second cross section having a second circumference perpendicular to the second direction and the second face 44 is perpendicular to the second direction, And a second width of 7% to 50% of the circumference.

When the first substrate 22 has a straight section perpendicular to the first direction, the first circumference corresponds to the circumference of the section.

Likewise, the second substrate typically has a constant straight cross-section along the second direction. In this case, the second perimeter corresponds to the perimeter of the straight cross section.

It is also possible for the second substrate to have a straight cross section slightly varying along the second direction. In this case, the average of the peripheries of all straight cross-sections of the second substrate is regarded as the second perimeter.

The first width corresponds to the width of the first surface 42 taken perpendicular to the first direction.

The first width is determined along the circumference of the first substrate 22.

Likewise, the second width corresponds to the width of the second surface 44 taken perpendicular to the second direction along the periphery of the second substrate 26.

The first width is greater than 7% of the first perimeter, preferably greater than 10% of the first perimeter, more preferably greater than 15% of the first perimeter. The first width is less than 50% of the first perimeter, meaning that the first substrate 22 is not fully contained within the second substrate 26 and is disposed next to the second substrate.

Likewise, the second width is greater than 7% of the second perimeter, preferably greater than 10% of the second perimeter, more preferably greater than 15% of the second perimeter. The second width is less than 50% of the second perimeter, meaning that the second substrate 26 is not fully contained within the first substrate 22.

The first surface 42 has a constant width, for example, along the first surface 42 along the first direction. The first width corresponds to the width. In a variation, the first surface has a variable width along the first surface parallel to the first direction. Accordingly, the average of the widths of the first surface considered as a section perpendicular to the first direction is selected as the first width.

Likewise, along the second face along the second direction, the second face 44 has a constant width, and the width corresponds to the second width. In a variant, the second face has a variable width along the second face along the second direction. Therefore, an average of the widths of the second surface considered as a section perpendicular to the second direction is regarded as the second width.

The first surface 42 and the second surface 44 are configured such that at least one of the first surface 42 and the second surface 44 has a first surface 42 and a second surface 44 Such that they are separated from one another by a distance of less than 30 mm, preferably less than 25 mm, or such that the distance between the envelopes 28 and 34 is less than 10 mm, preferably less than 5 mm, .

The first surface 42 and the second surface 44 extend longitudinally over substantially the entire length of the first substrate 22 and the second substrate 26, respectively.

Thus, in the embodiment shown in Figures 3 and 4, each point on the first side 42 is opposed from one point on the second side 44, but not vice versa, (22) is shorter than the second substrate (26).

In a variant, the second substrate 26 is shorter than the first substrate 22, so that each point on the first surface is opposed from one point on the second surface.

According to another embodiment, since the first substrate and the second substrate have the same length, each point of the first substrate is disposed facing one point of the second substrate.

The distance from one point of the first surface 42 to the second surface takes into account the direction through each point and perpendicular to the first surface.

In one embodiment shown in Figures 3-8, a first side 42 and a second side 44, taken perpendicular to the first and second directions, respectively, Has a radius of curvature exceeding 25% of the circumference. In other words, the first surface 42 and the second surface 44 each have a curvature sufficiently small so that they can be disposed close to each other at every point.

In this case, the first surface 42 is preferably curved convexly toward the second surface 44, and vice versa, the second surface 44 is preferably directed toward the first surface 42 It is curved convexly. However, it is conceivable that the first surface 42 is concave toward the second surface 44 and vice versa.

At least one of the first surface 42 and the second surface 44 is planar and preferably both the first surface 42 and the second surface 44 are planar, It is planar.

9, at least one of the first surface 42 and the second surface 44 taken perpendicular to the first direction D1 and the second direction D2, respectively, is 0.5 x (P ₁ / 2π) to 2 × (P ₁ / 2π) where P ₁ is the first circumference, preferably 0.75 × (P ₁ / 2π) to 1.25 × (P ₁ / 2π) .

In other words, at least one of the first surface 42 and the second surface 44 has a noticeable curvature.

Typically, as shown in FIG. 9, both the first surface 42 and the second surface 44 have prominent, close or substantially the same radius of curvature.

In this case, as shown in Fig. 9, one of the two surfaces 42, 44 is concave. The other of the two surfaces is convex and engages the concave surface. The concave and convex surfaces are substantially complementary to each other.

5, the first outer envelope 28 includes a first circumferential wall 46 that completely surrounds the first substrate 22, considering perpendicular to the first direction. do. Similarly, the second outer envelope 34 includes a second circumferential wall 48 that completely surrounds the second substrate 26, taking into account the perpendicular orientation to the second direction. The first peripheral wall and the second peripheral wall are separate from each other. They are not integrated with each other. These are tubular.

More specifically, the first peripheral wall 46 includes a first central segment 50 in which the first substrate 22 is received, and a first downstream end defining a first exhaust gas outlet 32 52). The downstream first end 52 is integral with the first central segment 50 and extends toward the volume 40 along the first direction.

The second peripheral wall 48 includes a second central segment 54 in which the second substrate 26 is received and an upstream second end 56 defining a second exhaust gas inlet 36. The second peripheral wall 48, .

3 and 4, the first circumferential wall 46 and the second circumferential wall 48 are spaced from each other by more than 75% of the longitudinal length of the first circumferential wall and the second circumferential wall, It is completely separated.

In the illustrated embodiment, the first circumferential wall is shorter than the second circumferential wall in the longitudinal direction, so that the first circumferential wall 46 and the second circumferential wall 48 have a length in the longitudinal direction of the first circumferential wall Lt; RTI ID = 0.0 > 80% < / RTI >

More specifically, the first end 52 downstream of the first circumferential wall contacts the second end 56 upstream of the second circumferential wall, but the first center segment 50 and the second center segment < RTI ID = 0.0 > (54) are completely separated from each other. They never come into direct contact with each other.

The gap 58 between the center segments 50, 54 allows the peripheral wall to expand freely at high temperatures.

3, a purging device is inserted between the first peripheral wall and the second peripheral wall to maintain spacing between the first central segment 50 and the second central segment 54. In one embodiment, (Not shown).

The spacer 60 may have any suitable shape, such as a metal leg, a rod extending parallel to the first and second directions, and the like.

The embodiment variant of Figures 3-6 having two separate and independent peripheral walls 46, 48 is characterized in that the opposing first and second surfaces 42, 44 have an increased radius of curvature In particular, it is suitable.

As shown in the figure, the first center segment 50 has a shape substantially corresponding to the shape of the cross section of the first piercing member 22, in the vertical section with respect to the first direction. A gap 62 of substantially constant thickness separates the first substrate 22 from the first central segment 50. A fibrous material mattress 64 is inserted between the first substrate 22 and the first center segment 50. This mattress allows the first substrate 22 to be held in a radial and axial position relative to the first housing. Likewise, the second center segment 54 has a shape substantially corresponding to the shape of the second substrate 26, in a vertical section with respect to the second direction. A mattress 66 is inserted between the second substrate 26 and the second center segment 54.

6, the first center segment 50 and the second center segment 54 also have respective surfaces 68, 70 that are opposite to each other and separated from each other by a gap 58, . One of the faces 68, 70 is separated from the other at all points with a distance of less than 10 mm, preferably less than 5 mm.

According to the second embodiment shown in Figs. 7 to 9, the purifier 1 is arranged to completely surround the first substrate 22 and the second substrate 26, taking into consideration the direction perpendicular to the first direction And includes a single perimeter wall 72 having a closed contour.

The single perimeter wall 72 includes a first region 74 that partially surrounds the first substrate 22 and a second region 76 that partially surrounds the second substrate 26. The first and second zones constitute the first circumferential wall 46 and the second circumferential wall 48 of the first outer envelope 28 and the second outer envelope 34.

8, the first exhaust gas purifying member 20 includes a first fabric material 78 interposed between the first substrate 22 and the single circumferential wall 72 . The first fabric 78 completely surrounds the first substrate 22 in consideration of the direction perpendicular to the first direction. A region 80 of the fabric is inserted between the first substrate 22 and the second substrate 26. The first fabric 78 is provided to maintain the first substrate 22 in position relative to the single circumferential wall 72.

The second exhaust gas purifying member 24 includes a second fabric 82 inserted between the second substrate 26 and the single circumferential wall 72. The second fabric 82 completely surrounds the second substrate 26 in consideration of the direction perpendicular to the second direction. A region 84 of the second fabric is inserted between the first substrate and the second substrate. Thus, the first substrate and the second substrate are separated from each other by a zone 80 of the first fabric and a zone 84 of the second fabric, and these two zones are stacked together. The second fabric 82 is provided to hold the second substrate 26 in position relative to the single circumferential wall 72.

At least one sealing joint 86 is preferably arranged to simultaneously contact the fibrous first fabric 78, the fibrous second fabric 82 and the single perimeter wall 72. Typically, two sealing joints 86 are disposed on both sides of the two substrates in the same plane as the zones 80 and 84. These joints can prevent leakage of the exhaust gas between the fiber fabric and the single circumferential wall. They may also attach the first fabric 78 and the second fabric 82 along the edges of these substrates to the first substrate 22 and the second substrate 26.

The joint 86 is typically a long rod that is embodied as a fibrous material.

7, the purifier includes a fabric perimeter fabric 88 that is interposed between the first substrate 22 and the second substrate 26 and the single perimeter wall 72 . The perimeter fabric 88 completely surrounds the first substrate 22 and the second substrate 26 in consideration of the vertical direction.

The purging device 1 also includes a fibrous intermediate fabric 90 that is interposed between the first substrate 22 and the second substrate 26 and the single perimeter wall 72. More specifically, the intermediate fabric 90 is inserted between the first side 42 and the second side 44. They extend over the entire width of the surfaces 42 and 44. The intermediate fabric 90 divides the volume internally defined by the perimeter fabric 88 into two seals facing each other for exhaust gas.

A first substrate 22 is received in one of the two portions and a second substrate 26 is received in another portion.

The embodiment of Figures 7 through 9 with single circumferential wall 72 is particularly well suited to embodiments of the present invention in which first surface 42 and second surface 44 have a large curvature as shown in Figure 9 Is adapted.

Independently of the first aspect, according to another aspect of the present invention, the volume 40 is defined by a cruciform cover 92 attached directly to the first outer envelope 28 and the second outer envelope 34 .

More specifically, the cover 92 includes a bottom portion 94 and a circumferential edge 96 having a closed contour protruding relative to the bottom portion 94, Is fixed directly to the envelope (28) and the second outer envelope (34).

Here, direct fixation or direct attachment means that the cover is not fixed to a lozenge-like piece such as the piece 8 shown in Figure 1, i.e. it is fixed to the first envelope 28 and the second envelope 34 . Since there is no lunate type piece, the first purifying member 20 and the second purifying member 24 can be brought close to each other, thereby making the purifying device much more compact. The cover is smaller. Since there is no looper and the cover is smaller, the purifier can be made lightweight and thermal inertia of the apparatus can be reduced. In addition, since the number of links is reduced, the number of weld seams can be reduced.

The dimensions of the linen-type piece, in particular the separation between the inlet and the outlet, are essential in the prior art of FIGS. 1 and 2, since there is a sufficient amount of material to form the collar surrounding the inlet and outlet.

Typically, the bottom portion 94 of the cover is planar. The perimeter edge 96 is tubular. In a variant, if for example an ammonia injector or an ammonia precursor injector is installed on the cover, the bottom 94 is of a more complex form.

More specifically, the first purifying member 20 and the second purifying member 24 simultaneously define an end portion facing the volume 40, a continuous outer end surface 98 having a closed contour, The edge 96 is also of a continuous shape with a closed contour. The peripheral edge 96 is fixed directly to the outer end surface 98.

The outer end face 98 is tubular. The outer end face 98 is defined by a first end 52 downstream of the first envelope and a second end 56 upstream of the second envelope and substantially does not include a zone in which they are attached to each other .

3 to 6, the downstream first end portion 52 and the upstream second end portion 56 constitute a part of two walls that are stellar with each other, and the downstream first end portion 52 and the upstream second end 56 are connected to each other to form a continuous surface having a closed contour.

In the embodiment of FIGS. 7-9, the outer end surface 98 corresponds to the end of the single circumferential wall 72 toward the volume 40.

The circumferential edge 96 ends at a continuous free edge 100 having a closed contour in the form of being coupled to the shape of the outer end face 98 at the opposite side of the bottom portion 94. The free edge 100 is attached to the outer end face 98 and is rigidly fixed, e.g. welded, to the outer end face.

The outer end face 98 engages the interior of the free edge 100.

Thus, the perimeter edge 96, more specifically its free edge 100, defines an opening internally having a predetermined area perpendicular to the first direction. The first outlet 32 has a first area perpendicular to the first direction. The second inlet (36) has a second area perpendicular to the second direction.

The sum of the first area and the second area is substantially equal to the predetermined area.

Typically, the free edge 100 has a shape obtained by rotating a certain type of bus line along a directional curve having a closed contour extending in a plane substantially perpendicular to the longitudinal direction. The busbar has the form of, for example, a straight segment of longitudinal orientation. In a variant, it has the form of a straight segment which is slightly inclined with respect to the longitudinal direction.

Directional curves with a closed contour can have any type of shape. This may be, for example, oval, elliptical or any other shape with or without bending in the center.

In the embodiment of Figures 3-6 in which the first peripheral wall 46 and the second peripheral wall 48 are separate from each other, the downstream first end 52 and the upstream second end 56 , It is advantageous to have each of the first section 102 and the second section 104 attached to each other as shown in Figures 5 and 6.

The first section 102 and the second section 104 are advantageously straight, i.e., straight. They typically extend parallel to the first side 42 and the second side 44. The first section 102 and the second section 104 may be formed so that the first circumferential length of the first end portion of the downstream side is a first circumferential length and the circumferential length of the second end portion of the upstream side is a second circumferential length, Extends over 15% of the first circumferential length and over 10% of the second circumferential length, respectively.

Preferably, the first section 102 and the second section 104 each extend over 20% of the first circumferential length and over 15% of the second circumferential length, respectively.

The first section 102 and the second section 104 extend longitudinally over at least 25% of the longitudinal length of the first circumferential wall 46 and / or the second circumferential wall 48.

As shown in Figures 3 and 4, the downstream first end 52 and the upstream second end 56 are substantially perpendicular to the first and second directions, Sectional area of the second central segment 54 and the second central segment 54. The first and second cross-

In other words, the downstream first end portion 52 slightly protrudes toward the outside of the first purification member with respect to the first center segment 50 over the entire circumference or substantially the entire circumference. Likewise, the upstream second end 56 protrudes toward the outside of the second purging member with respect to the second center segment 54 over the entire perimeter or substantially the entire perimeter.

The downstream first section is separated from the first center segment by an outward shoulder 106. The upstream second end 56 is separated from the second center segment 54 by an outwardly directed shoulder 108.

This arrangement may create a gap 58 between the center segments 50, 54.

Due to this cross-sectional expansion, the downstream first end 52 and the upstream second end 56 are positioned at the locations of the first and second substrates via fiber weirs 64 and 66, Lt; RTI ID = 0.0 > blocking. ≪ / RTI > This retention is only implemented in the central segment (50, 54).

As shown in FIGS. 10 and 11, whatever the form of the first substrate 22 and the second substrate 26, the downstream first end 52 and the upstream second end 56, The first section 102 and the second section 104 may be formed.

In the embodiment of Figs. 10 and 11, the first substrate 22 and the second substrate 26 each have a circular cross-section, which is considered perpendicular to the first direction and the second direction. In a variant, the first substrate and the second substrate are made of an oval or " racetrack " having two substantially parallel sides which are substantially flat or have a large radius of curvature and are connected by an arc of smaller radius of curvature race-track " type.

The first center segment 50 is in the form of a cylinder having a circular cross section. The downstream first end 52 includes an arcuate portion 110 that extends beyond the straight section 102 and extends over 60% of the downstream first end. The straight section 102 extends in a plane substantially in contact with the first substrate 22. This is connected to the arcuate portion 110 by a side 112 connected to the straight section 102 along the perpendicular to the straight section 102 and along the direction included between the tangent to the section 110 do.

The straight section 102 is typically formed only at the end of the canning.

Likewise, the second center segment 54 is in the form of a cylinder having a circular cross section adapted to receive the second substrate 26. The upstream second end 56 includes an arcuate portion 114 extending beyond the straight section 104 and extending over 60% of the upstream second end. The straight line section 104 extends in a plane in contact with the second substrate 26. The straight section 104 is formed by a side surface 116 connected to the straight section 104 along a perpendicular to the straight section 104 and a tangent to the arcuate section 114, Portion 114 of the apparatus.

12 to 16, the purifying device 1 includes an outer cover 118 and an inner cone 120 received in the outer cover 118. [

The first peripheral wall 46 and the second peripheral wall 48 define a first end 122 upstream and a second exhaust outlet 38 defining the first exhaust gas inlet 30, And a second end 124 downstream of the second end. The outer cover 118 has a shape and dimensions selected to cover the first inlet 30 and the second outlet 38 simultaneously. Thus, the upstream first end 122 and the downstream second end 124 are fully received in the outer cover 118. In a variation that is not shown, the outer cover 118 is received within the upstream first end 122 and the downstream second end 124.

An inlet (16) and an outlet (18) of the exhaust gas are provided in the outer cover (118).

The inner cone 120 has an outlet end 126 that covers only the first inlet 30 and an inlet end 128 that is sealingly connected to the inlet 16.

More specifically, the outlet end 126 is received in the upstream first end 122, or vice versa, the upstream first end 122 is received in the outlet end 126.

The outer cover 118 includes a bottom 130 having an inlet 16 and an outlet 18 and a side wall 130 extending from the bottom of the bottom 130, Lt; RTI ID = 0.0 > 132 < / RTI > The side wall 132 has a closed contour and projects longitudinally toward the first peripheral wall 46 and the second peripheral wall 48.

As shown in the figure, the first peripheral wall 46 and the second peripheral wall 48 have substantially the same length in the longitudinal direction. Thus, the upstream first end 122 and the downstream second end 124 simultaneously define another continuous outer surface 134 having a closed contour, to which the sidewall 132 is directly secured.

The inlet (16) and outlet (18) are defined by collar (136) and (138) protruding toward the outside of the purifier. The collar 136 and 138 project longitudinally against the bottom 130 on the opposite side of the side wall 132.

The inlet 16 is mechanically connected directly to the upstream equipment 140 (FIG. 13).

More specifically, the upstream equipment 140 has an exhaust gas outlet 142 that is substantially extended by an exhaust gas circulation conduit. The inlet 16 is mechanically connected directly to the exhaust gas outlet 142 or directly to the conduit. The collar 136 is firmly fixed to the upstream device 140. For example, it is welded to a bicone 143 of the type shown in Figure 16, which is typically connected to the upstream equipment 140 by a V-shaped clamp. In a variant, the collar 136 is typically connected directly to the cone-bracket of the upstream device 140 by a V-shaped clamp. 13, the inlet 16 is fixed to the upstream equipment 140 by means of a bracket 144. In the embodiment shown in Fig.

In this way, at least the outer cover 118 is mechanically connected directly to the upstream equipment 140.

According to a first embodiment variant, the inner cone 120 is mechanically connected to the upstream equipment 140 only via its outer cover 118, typically by its inlet end 128. This state is shown in Figs. 12 to 15. Fig.

In other words, the loads and stresses transmitted between the purifier and upstream equipment 140 are primarily transmitted through the outer cover 118. This load, in particular or exclusively, passes through the link between the outer cover 118 and the upstream equipment 140.

As a result, the outer cover 118 is embodied as a relatively thicker material, e.g., 1 mm to 2 mm thick. The outer cover 118 is embodied in, for example, stainless steel, for example, stainless steel 1.4509, stainless steel 1.4510, stainless steel 1.4512 or stainless steel 1.4301.

Because the inner cone 120 is not loaded, it is embodied as a material, e.g., 0.5 mm to 1 mm thick, relatively less thicker than the outer cover 118. For example, the inner cone 120 is implemented in stainless steel, such as stainless steel 1.4509, stainless steel 1.4510, or stainless steel 1.4301.

In the second embodiment shown in FIG. 16, the inner cone 120 is connected to the upstream equipment 140 together with the outer cover 118. In other words, a single link 145 serves as a connection between the inner cone 120 and the outer cover 118 with respect to the upstream equipment 140.

This single link 145 is, for example, welded. In the illustrated embodiment, it connects inner cone 120 and outer cover 118 to bicon 143 connected to upstream equipment 140.

As described above, since the outer cover 118 is implemented with a relatively thicker material, most of the load is transferred between the purifier and the upstream equipment 140 via the outer cover 118. Therefore, it is possible to implement the inner cone 120 with a relatively less thick material. The material and thickness of the outer cover 118 and the inner cone 120 are generally the material and thickness disclosed by the first embodiment.

13, the inner cone 120 has a cross-section that extends from the inlet end 128 to the outlet end 126. As shown in FIG. The outlet end 126 is tightly fixed to the upstream first end 122 in a sealing manner. For example, an inner cross-section that is complementary to the outer cross-section of the upstream first end portion 122, the upstream first end portion 122 engaging the outlet end 126 of the inner cone.

The inner end (128) of the inner cone engages the collar (136). Which is firmly fixed to the collar 136 by any suitable means. Typically, the inlet end 128 has an outer cross-section that is complementary to the inner cross-section of the collar 136. The inlet end is secured to the inner surface of the collar 136 by, for example, a welding line (not shown). In a variant, it engages without spacing, which causes the load transmission through the inner cone to disappear.

13, the inner cone 120 and the outer cover 118 are spaced from each other by a space (not shown) extending in the entire circumference of the inner cone 120 therebetween and in fluid communication with the outlet 18 (146). The exhaust gas from the second purifying member 24 by the second outlet 38 circulates around the inner cone 120 in the space 146 before being discharged by the outlet 18 .

The configurations disclosed above have a number of advantages. By implementing the inner cone 120 with a thin material, the weight and thermal inertia of the purifier can be reduced. In addition, the space 146 allows the exhaust gas from the second purifying member to circulate around the inner cone 120, thereby enabling rapid temperature increase of the inner cone 120, And is exposed to the exhaust gas by its inner surface and its outer surface. Therefore, when the first substrate and / or the second substrate must reach a minimum temperature for efficient purification of the exhaust gas, the temperature is reached earlier.

The first substrate and the second substrate may be of any type suitable for the purification of exhaust gases. For example, for a gasoline engine, the first substrate is a three-way catalyst and the second substrate is another three-way catalyst or particle filter. For a diesel engine, the first substrate is, for example, an oxidation catalyst and the second substrate is, for example, a particle filter. Alternatively, the first substrate may be a PNA (Passive NOx Absorber) or a NOx trap (LNT) and the second substrate may be a particle filter or a Selective Catalytic Reduction (SCR) catalyst or a Selective Catalytic Reduction Filter ) Catalyst filter or an SCRF type catalyst filter followed by an SCR type catalyst. In the case where the second substrate comprises an SCRF type catalyst or an SCR type catalyst, a mixing device is preferably provided in the volume (40). In this case, the purifying apparatus includes a device for injecting a reduction product of nitrogen oxides, such as ammonia or ammonia precursors, which is provided for performing the injection upstream of the mixing device. The injection is typically carried out in the volume 40. The jet is, for example, a product sold under the trademark Adblue or aqueous urea solution or gaseous ammonia (ASDS technology).

The first substrate 22 and the second substrate 26 do not necessarily occupy the entire volume defined internally by the first envelope and the second envelope. As shown in FIG. 15, one and / or the other of the substrates may occupy only a portion of the longitudinal length of the first envelope and / or the second envelope. The free volume can thus be used for the installation of the injector or mixer of the reduction product of nitrogen oxides or any other device adapted.

Claims (10)

As an exhaust gas purifying apparatus,
A first exhaust envelope 28 defining a first exhaust gas inlet 30 and a first exhaust gas outlet 32 and a first exhaust gas purifying substrate 22 housed within the first envelope 28. [ , Wherein the exhaust gas circulates in the first direction (D1) on the first substrate (22); a first purifying member (20) comprising:
- a second exhaust envelope (34) defining a second exhaust gas inlet (36) and a second exhaust gas outlet (36) and a second exhaust gas purifying substrate (26) housed in said second envelope As the second purifying member 24, the exhaust gas is circulated along the second direction D2 opposite to the first direction D1 on the second substrate 26, and the first and second purifying members 20, 24) are arranged side by side and in parallel with each other; a second purifying member (24); And
- a volume (40) fluidly connecting said first outlet (32) to said second inlet (36)
/ RTI >
The volume 40 is defined by a crucible cover 92 that is directly coupled to the first and second outer envelopes 28 and 34 and the cover 92 includes a bottom 94 and a bottom 94 with a closed configuration having a closed shape that is fixed to the first and second outer envelopes (28, 34), wherein the peripheral edge (96) (100)
The first and second purging members 20, 24 are arranged to separate from each other and define a continuous outer end face 98 having a closed shape toward the volume 40, The shape of the outer end face 98 is modified,
The first envelope 28 includes a first circumferential wall 46 which is completely perpendicular to the first direction 22 and which is considered perpendicular to the first direction D1,
The second envelope 34 includes a second circumferential wall 48 completely surrounding the second substrate 26 and considered perpendicular to the second direction D2,
The first and second peripheral walls 46 and 48 are completely separate from each other and define a downstream first end 52 and a second upstream end 56 defining a first outlet 32 and a second inlet 36, ),
The downstream first end 52 and the upstream second end 56 define the continuous outer end surface 98 having a closed configuration together,
The downstream first end 52 and the upstream second end 56 have respective first and second segments 102, 104 attached to one another,
The first and second peripheral walls 46 and 48 are spaced apart from the downstream first end 52 and the upstream second end 56 along the first and second directions D1 and D2 And the downstream first end (52) and the upstream second end (56) have respective first and second center segments (50, 54) located in the first and second directions ) Having a first and a second cross section perpendicular to the first and second center segments (50, 54), respectively. The method according to claim 1,
The free edge 100 has a shape obtained by rotating a bus along a directional curve having a closed shape and the busbar is parallel to the first and second directions D1 and D2, 1 and the second direction (D1, D2). 3. The method according to claim 1 or 2,
The free edge 100 internally defines an opening having an area defined perpendicular to the first direction D1 and the first outlet 32 has a first area perpendicular to the first direction D1 , The second inlet (36) has a second area perpendicular to the second direction (D2), and the sum of the first and second areas is equal to the predetermined area. 3. The exhaust gas purification apparatus according to claim 1 or 2, wherein the outer end surface (98) is tubular. The exhaust gas purifying apparatus according to claim 1 or 2, wherein the cover (92) is integral. delete The exhaust gas purification apparatus according to claim 1, wherein the first and second segments (102, 104) are linear. 2. The method of claim 1, wherein the downstream first end (52) and the upstream second end (56) have respective first and second circumferential lengths, the first and second segments (102, 104) Each extending at least 15% of the first circumferential length and at least 10% of the second circumferential length, respectively. delete An exhaust line comprising the purifying device (1) according to claim 1 or 2.

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