JP2013050082A - Diesel particulate filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a diesel particulate filter in which the generation of a crack in a passageway wall is suppressed.SOLUTION: One passageway 1 is surrounded by passageway walls 3 convexly curved from the up and down, right and left four directions toward the center of the passageway 1 and other passageways 2 present in the left and the right of the passageway 1 are held between the passageway walls 3 convexly curved from the center side of the other passageways 2 toward the right and left direction. The other passageways 2 present in the up and down direction of one passageway 1 are held between the passageway walls 3 convexly curved from the center side of the other passageway 2 toward the up and down direction.

Description

  The present invention relates to a diesel particulate filter, and more particularly to a diesel particulate filter capable of suppressing the occurrence of cracks in a passage wall. PM used in this specification and claims is an abbreviation for particulate matter.

Conventionally, as a diesel particulate filter, the inlet passage and the outlet passage are arranged next to each other, the inlet passage plugs the exhaust downstream end, the outlet passage plugs the exhaust upstream end, the inlet passage and the outlet When exhaust is passed through passage walls between passages, there is one that captures PM contained in the exhaust by passage walls (see, for example, Patent Document 1).
According to this type of filter, when the PM accumulation amount reaches a predetermined amount, the exhaust temperature is raised by the combustion heat of the unburned fuel mixed into the exhaust by post injection or the like, and the accumulated PM is incinerated and removed for regeneration. There is an advantage that can be achieved.
However, this prior art has a problem because the passage walls of the inlet passage and the outlet passage are formed of flat walls.

Japanese Patent Laying-Open No. 2005-7218 (see FIG. 2)

<Problem> There is a risk of cracks in the passage walls.
Since the passage walls of the inlet passage and the outlet passage are formed of flat walls, the passage walls are not easily deformed, and there is a possibility that the passage walls may crack due to thermal stress generated by PM combustion during regeneration.

  The subject of this invention is providing the diesel particulate filter which can suppress that a crack generate | occur | produces in a passage wall.

Invention specific matters of the invention according to claim 1 are as follows.
As illustrated in FIG. 3, the inlet passage (1) and the outlet passage (2) are arranged next to each other, the inlet passage (1) plugs the exhaust downstream side end (1a), and the outlet passage (2). Is included in the exhaust (4) when the exhaust upstream end (2a) is sealed and the exhaust (4) is passed through the passage wall (3) between the inlet passage (1) and the outlet passage (2). In a diesel particulate filter that captures particulate matter to be trapped by the passage wall (3),

  As illustrated in any one of FIGS. 1 and 4 to 6, the cross-section is orthogonal to the central axis (5a) of the filter (5) when viewed in a direction parallel to the central axis (5a) of the filter (5). The annular passage walls (6) having an annular shape are arranged in the left-right direction, and the annular passage walls (6) arranged in the left-right direction are arranged in the up-down direction. It intersects with the passage wall (6) at each of two intersections (6a) (6a) at the top and bottom, and the annular passage wall (6) adjacent at the top and bottom at each of the intersections (6a) (6a) at the left and right The upper left and right intersections (6a) and (6a) where the annular passage walls (6) intersect the left and right annular passage walls (6) are intersected, and the annular passage walls (6) are upper annular passage walls. Each annular passage wall (6) intersects with the left and right annular passage walls (6) so as to overlap the upper left and right intersections (6a) and (6a) intersecting with (6). The lower left and right intersections (6a) and (6a) are located at the lower left and right intersections (6a) and (6a) where each annular passage wall (6) intersects the lower annular passage wall (6). By forming the other passage (2) adjacent to the top, bottom, left and right of the one passage (1) out of the entrance passage (1) and the outlet passage (2),

  The one passage (1) is surrounded by a passage wall (3) that bends convexly from the four sides of the top, bottom, left and right toward the center of the one passage (1). The other passage (2) is sandwiched between passage walls (3) that bend in a convex shape from the center side of the other passage (2) to the left and right, and the other passage above and below the one passage (1). (2) is a diesel particulate filter characterized in that it is sandwiched between passage walls (3) that bend upward and downward from the center side of the other passage (2).

(Invention of Claim 1)
The invention according to claim 1 has the following effects.
<Effect> It is possible to suppress the occurrence of cracks in the passage wall.
As illustrated in any one of FIGS. 1 and 4 to 6, the one passage (1) is a passage wall that bends in a convex shape from the upper, lower, left, and right sides toward the center of the one passage (1). The other passage (2) on the left and right of this one passage (1) is surrounded by (3) and is a passage wall (3) that curves in a convex shape from the center side of this other passage (2) to the left and right. The other passage (2) above and below the one passage (1) is sandwiched between passage walls (3) that bend upward and downward from the center side of the other passage (2). Therefore, the passage wall (3) is easily deformed, and it is possible to suppress the occurrence of cracks in the passage wall (3) even if thermal stress is generated by PM combustion during regeneration.

(Invention of Claim 2)
The invention according to claim 2 has the following effect in addition to the effect of the invention according to claim 1.
<Effect> The crack prevention function of the passage wall is high.
As illustrated in FIG. 1, the axial cross-sectional shape of the annular passage wall (6) with respect to the central axis (5a) of the filter (5) is circular, and the passage walls (1) and (2) of the passage (2) Since all of 3) are curved walls, the crack suppressing function of the passage wall (3) is high.

(Invention of Claim 3)
The invention according to claim 3 has the following effect in addition to the effect of the invention according to claim 1.
<Effect> The crack prevention function of the passage wall is high.
As illustrated in FIG. 4, the axial cross-sectional shape of the annular passage wall (6) with respect to the central axis (5 a) of the filter (5) is elliptical, and the passage walls of the inlet passage (1) and the outlet passage (2) Since all (3) are curved walls, the crack suppressing function of the passage wall (3) is high.

(Invention of Claim 4)
The invention according to claim 4 has the following effect in addition to the effect of the invention according to claim 1. << Effect >> The crack suppressing function of the passage wall is high.
As illustrated in FIG. 5 or FIG. 6, the axial cross-sectional shape of the annular passage wall (6) with respect to the central axis (5a) of the filter (5) is a polygon, and the inlet passage (1) and the outlet passage (2). Since the passage walls (3) are all bent walls, the crack prevention function of the passage walls (3) is high.

(Invention according to claim 5)
The invention according to claim 5 has the following effect in addition to the effect of the invention according to claim 4.
<Effect> The crack prevention function of the passage wall is high.
As illustrated in FIG. 5, the axial cross-sectional shape of the annular passage wall (6) with respect to the central axis (5a) of the filter (5) is an octagon, and the passage walls of the inlet passage (1) and the outlet passage (2). Since all of (3) are bent-shaped walls which are bent, the crack suppressing function of the passage wall is high.

(Invention of Claim 6)
The invention according to claim 6 has the following effect in addition to the effect of the invention according to claim 4.
<Effect> The crack prevention function of the passage wall is high.
As illustrated in FIG. 6, the axial cross-sectional shape of the annular passage wall (6) with respect to the central axis (5 a) of the filter (5) is a dodecagon, and the passage walls of the inlet passage (1) and the outlet passage (2) Since (3) is a narrowed U-shaped wall that is bent at the tip, the function of suppressing cracks in the passage wall is high.

It is an enlarged view of the passage wall of the diesel particulate filter concerning a 1st embodiment of the present invention. It is a perspective view of the diesel particulate filter concerning a 1st embodiment of the present invention. It is a longitudinal section of the diesel particulate filter concerning a 1st embodiment of the present invention. It is an enlarged view of the passage wall of the diesel particulate filter concerning a 2nd embodiment of the present invention. It is an enlarged view of the passage wall of the diesel particulate filter concerning a 3rd embodiment of the present invention. It is an enlarged view of the passage wall of the diesel particulate filter concerning a 4th embodiment of the present invention.

  1 to 3 illustrate a diesel particulate filter according to the first embodiment of the present invention, FIG. 4 illustrates a diesel particulate filter according to the second embodiment, and FIG. 5 illustrates the third embodiment. The figure explaining the diesel particulate filter which concerns, FIG. 6: is a figure explaining the diesel particulate filter which concerns on 4th Embodiment.

The outline of the diesel particulate filter according to the first embodiment is as follows.
As shown in FIG. 3, the inlet passage (1) and the outlet passage (2) are arranged next to each other, the inlet passage (1) plugs the exhaust downstream end (1a), and the outlet passage (2) It is included in the exhaust (4) when the exhaust upstream end (2a) is sealed and the exhaust (4) is passed through the passage wall (3) between the inlet passage (1) and the outlet passage (2). PM is captured by the passage wall (3).

As shown in FIG. 1, when viewed in a direction parallel to the central axis (5a) of the filter (5), an annular passage wall (6) having an axial orthogonal cross-section with respect to the central axis (5a) of the filter (5) is annular. Are arranged in the horizontal direction, and the annular passage walls (6) arranged in the horizontal direction are arranged in the vertical direction.
Each annular passage wall (6) intersects with the annular passage wall (6) adjacent on the left and right at two intersecting portions (6a) and (6a) at the upper and lower portions, and the annular passage wall (6) adjacent on the upper and lower sides. And the left and right intersections (6a) (6a), and the upper left and right intersections (6a) (6a) where each annular passage wall (6) intersects the left and right annular passage walls (6) are Each annular passage wall (6) overlaps with the left and right intersections (6a) (6a) intersecting with the upper annular passage wall (6), and each annular passage wall (6) has left and right annular passage walls ( 6) The lower left and right intersections (6a) and (6a) intersecting with the left and right intersections (6a) and (6a) where each annular passage wall (6) intersects with the lower annular passage wall (6). ) And the exit passage (2) adjacent to the top, bottom, left and right of the entrance passage (1).

Thereby, the entrance passage (1) is surrounded by a passage wall (3) that bends in a convex shape from the upper, lower, left, and right sides toward the center of the entrance passage (1), and is located on the left and right sides of the entrance passage (1). The exit passage (2) is sandwiched between passage walls (3) that bend from the center side of the exit passage (2) to the left and right, and the exit passages (2) above and below the entrance passage (1) It is made to pinch | interpose with the channel | path wall (3) which curves in the convex shape toward the upper and lower sides from the center side of the channel | path (2).
It is also possible to change the sealing positions of the inlet passage (1) and the outlet passage (2) so that the inlet passage (1) is the outlet passage (2) and the outlet passage (2) is the inlet passage (1).

  As shown in FIG. 1, the axial cross-sectional shape of the annular passage wall (6) with respect to the central axis (5a) of the filter (5) is circular, and the passage wall (3) of the inlet passage (1) and the outlet passage (2). ) Are curved walls.

  The filter (5) is a ceramic wall flow type, and when the amount of accumulated PM reaches a predetermined amount, the exhaust temperature is raised by the combustion heat of unburned fuel mixed into the exhaust by post injection or the like, and the accumulated PM Incineration is removed to recycle.

The second embodiment shown in FIG. 4 differs from the first embodiment in the following points.
The axial cross-sectional shape of the annular passage wall (6) with respect to the central axis (5a) of the filter (5) is elliptical, and the passage walls (3) of the inlet passage (1) and the outlet passage (2) are both curved. It is designed to be a wall.
The other configuration is the same as that of the first embodiment shown in FIG. 1. In FIG. 4, the same elements as those of FIG.

The third embodiment shown in FIG. 5 or the fourth embodiment shown in FIG. 6 differs from the first embodiment in the following points.
The axial cross-sectional shape of the annular passage wall (6) with respect to the central axis (5a) of the filter (5) is a polygon, and the passage walls (3) of the inlet passage (1) and the outlet passage (2) are both bent. It is designed to be a wall.
In the third embodiment shown in FIG. 5, the axial cross-sectional shape of the annular passage wall (6) with respect to the central axis (5a) of the filter (5) is an octagon, and the inlet passage (1) and the outlet passage (2) All of the passage walls (3) are bent-shaped walls.
In the fourth embodiment shown in FIG. 6, the cross-sectional shape of the annular passage wall (6) perpendicular to the central axis (5a) of the filter (5) is a dodecagon, and the inlet passage (1) and the outlet passage (2) Each of the passage walls (3) is a U-shaped wall having a narrowed tip shape that is bent.
The other configuration is the same as that of the first embodiment shown in FIG. 1. In FIGS. 5 and 6, the same elements as those in FIG.

(1) Entrance passage
(1a) Exhaust downstream end
(2) Exit passage
(2a) Exhaust upstream end
(3) Aisle wall
(4) Exhaust
(5) Filter
(6) Annular passage wall
(6a) Intersection

Claims (6)

The inlet passage (1) and the outlet passage (2) are arranged next to each other, the inlet passage (1) plugs the exhaust downstream end (1a), and the outlet passage (2) is the exhaust upstream end (2a). ), And when the exhaust (4) is passed through the passage wall (3) between the inlet passage (1) and the outlet passage (2), PM contained in the exhaust (4) is passed through the passage wall (3). In the diesel particulate filter captured by
When viewed in a direction parallel to the central axis (5a) of the filter (5), the annular passage wall (6) having an axial cross-sectional shape with respect to the central axis (5a) of the filter (5) is arranged in the left-right direction, The annular passage walls (6) arranged in the left-right direction are arranged in the up-down direction, and each annular passage wall (6) is adjacent to the annular passage wall (6) adjacent to the right and left, and two intersecting portions (6a) ( 6a) and the adjacent annular passage walls (6) at the upper and lower sides thereof at the left and right intersections (6a) and (6a), respectively, so that each annular passage wall (6) has left and right annular passage walls ( 6) The upper left and right intersections (6a) (6a) intersecting with the upper annular passage wall (6) intersect with the upper left and right intersections (6a) (6a). ) And the lower left and right intersections (6a) and (6a) where each annular passage wall (6) intersects with the left and right annular passage walls (6) Of the entrance passage (1) and the exit passage (2) so that the left and right intersections (6a) and (6a) intersect the lower annular passage wall (6). Among them, by forming the other passage (2) adjacent to the upper, lower, left and right of one passage (1),
The one passage (1) is surrounded by a passage wall (3) that bends convexly from the four sides of the top, bottom, left and right toward the center of the one passage (1). The other passage (2) is sandwiched between passage walls (3) that bend in a convex shape from the center side of the other passage (2) to the left and right, and the other passage above and below the one passage (1). (2) is a diesel particulate filter characterized in that it is sandwiched between passage walls (3) that bend upward and downward from the center side of the other passage (2). In the diesel particulate filter according to claim 1,
A wall in which the axial cross-sectional shape of the annular passage wall (6) with respect to the central axis (5a) of the filter (5) is circular, and the passage walls (3) of the inlet passage (1) and the outlet passage (2) are both curved. A diesel particulate filter characterized by that. In the diesel particulate filter according to claim 1,
The axial cross-sectional shape of the annular passage wall (6) with respect to the central axis (5a) of the filter (5) is elliptical, and the passage walls (3) of the inlet passage (1) and the outlet passage (2) are both curved. Diesel particulate filter characterized by being a wall. In the diesel particulate filter according to claim 1,
The axial cross-sectional shape of the annular passage wall (6) with respect to the central axis (5a) of the filter (5) is a polygon, and the passage walls (3) of the inlet passage (1) and the outlet passage (2) are both bent. Diesel particulate filter characterized by being a wall. The diesel particulate filter according to claim 4,
The cross-sectional shape of the annular passage wall (6) perpendicular to the central axis (5a) of the filter (5) is an octagon, and the passage walls (3) of the inlet passage (1) and the outlet passage (2) are both bent. A diesel particulate filter characterized by a square-shaped wall. The diesel particulate filter according to claim 4,
The axial cross-sectional shape of the annular passage wall (6) with respect to the central axis (5a) of the filter (5) is a dodecagon, and both the passage walls (3) of the inlet passage (1) and the outlet passage (2) are bent. A diesel particulate filter characterized by having a U-shaped wall with a narrowed tip.

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