JP3078428B2 - Exhaust gas filter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas filter for collecting fine particles mainly composed of carbon contained in exhaust gas and removing the accumulated fine particles by a gas flow in a direction opposite to the flow of the exhaust gas.

[0002]

2. Description of the Related Art Exhaust gas from a diesel engine contains a high concentration of fine particles mainly composed of carbon, which causes pollution such as air pollution. Various exhaust gas filters have been proposed for collecting and removing such fine particles contained in exhaust gas of diesel engines.

[0003] Japanese Patent Application Laid-Open No. 1-159408 discloses a honeycomb filter using a honeycomb filter as an exhaust gas filter, sealing one end of a predetermined gas flow hole of a honeycomb structure, and removing another gas flow hole. Seals the other end. This honeycomb filter captures fine particles mainly composed of carbon, and intermittently separates the fine particles deposited on the inner wall of the honeycomb filter from the inner wall of the filter by a backwashing airflow opposite to the exhaust gas flow, thereby regenerating the filter. I do. The separated fine particles are accumulated and burned in a recollecting section provided in an upstream portion of the exhaust gas passage of the filter.

[0004]

However, in such a conventional exhaust gas filter, when the fine particles are separated by the backwashing airflow, the backwashing airflow flows into the vicinity of the sealing portion of the gas flow hole on the upstream side of the backwashing airflow. Therefore, the deposited fine particles are not sufficiently separated and remain. Therefore, there is a problem that the exhaust gas filter is not sufficiently regenerated and a pressure loss increases.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem. Fine particles mainly composed of carbon deposited on an exhaust gas filter are separated by an airflow blown into the exhaust gas filter, and the exhaust gas filter is regenerated. An object of the present invention is to provide an exhaust gas filter that maintains a good particulate collection function without increasing the pressure loss of exhaust gas.

[0006]

An exhaust gas filter according to the present invention for solving the above-mentioned problems comprises an outer wall surrounding a side surface,
A honeycomb structure having an inner wall formed on the inner peripheral side of the outer wall so as to extend in the exhaust gas flow direction, and forming a plurality of gas flow holes through which the exhaust gas flows by the inner wall and the outer wall and the inner wall. And a part of the gas flow holes, in the predetermined same gas flow holes formed by the gas flow holes continuously adjacent to each other across the inner wall, to seal an end on the exhaust gas downstream side. A sealing portion, a second sealing portion that seals an end portion on the exhaust gas upstream side of the gas flow hole in the same row as the remaining portion of the gas flow hole, and an exhaust gas upstream side portion of the first sealing portion of the honeycomb structure, And an airflow introduction hole penetrating the inner wall in the same row direction of the first sealing portion and penetrating at least one of the outer walls at both ends in the same row direction of the inner wall.

In the exhaust gas filter, first airflow generating means for generating an airflow flowing into the honeycomb structure from the exhaust gas downstream side of the honeycomb structure, and flowing into the airflow introduction hole from outside the outer wall of the honeycomb structure. It is desirable to have a second airflow generating means for generating an airflow.

[0008]

In the exhaust gas filter according to the present invention, the honeycomb structure is used as the exhaust gas filter, a first sealing portion is formed at an end of the predetermined same gas flow hole on the exhaust gas downstream side, and the remaining same gas flow hole is formed. A second sealing portion is formed at an end of the exhaust gas upstream side of the first sealing portion, penetrates the inner wall in the column direction near the first sealing portion, and penetrates at least one outer wall at both ends in the same column direction of the inner wall to form an airflow introduction hole. Has formed. By ejecting an airflow from the outer wall of the exhaust gas filter to the airflow introduction hole, fine particles deposited near the first sealing portion are satisfactorily separated.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an exhaust gas filter according to a first embodiment of the present invention.
3 to FIG. The exhaust gas filter 10 is formed of a columnar honeycomb structure of porous cordierite.
The exhaust gas filter 10 includes a gas flow hole 1 surrounded by an inner wall 11, an inner wall 11, or an outer wall 13, which will be described later.
2. The outer wall 13 surrounding the side surface of the exhaust gas filter 10, the first sealing part 21 and the second sealing part 22 for sealing the end of the gas flow hole 12, and the first sealing part 21 in the row direction where the first sealing part 21 is formed. , A sub-pulse airflow introduction hole 23 penetrating the vicinity thereof, a compressor 25 for ejecting a main pulse airflow, and a compressor 26 for ejecting a subpulse airflow.

The first sealing portion 21 is formed at a downstream end of the exhaust gas flow of the exhaust gas filter 10 to have a predetermined thickness in a straight line in the same row direction. The second sealing part 22 is a first sealing part 2
The exhaust gas filter 1 is provided in the other row of the row where
0 at the upstream end of the exhaust gas flow. As shown in FIG. 3, the sub-pulse airflow introduction hole 23 is provided near the gas flow hole 12 where the first sealing portion 21 is formed, and in the row direction where the first sealing portion 21 is formed. Is formed so as to penetrate the exhaust gas filter 10. Since the sub-pulse airflow introduction hole 23 only needs to have a sub-pulse airflow inlet, the outer wall at one end of the sub-pulse airflow introduction hole 23 does not need to be removed.

For example, the compressors 25 and 26 may be shared with an existing compressor mounted on a vehicle, or a dedicated compressor may be installed. 4 and 5 show one embodiment of an exhaust gas treatment apparatus to which the exhaust gas filter 10 of the first embodiment is applied. A branch pipe 32 is connected to the exhaust gas pipe 31 into which the exhaust gas flows, and the exhaust gas is sent to a pair of filter pipes 33. Filter tube 3
A switching valve 41 is provided at the exhaust gas inlet 34 of No. 3 to switch between the exhaust gas flow and the flow of the pulsed air flow described later. The filter space 33 may be installed in any direction according to the space.

The exhaust pipe filter 10 is accommodated in the filter pipe 33 with the gas flow pipe parallel to the direction of the exhaust gas flow. A gas inlet / outlet 35 is provided on the end face of the filter pipe 33 opposite to the exhaust gas inlet 34. A sub-pulse inflow pipe 36 is provided at a side wall position of the filter pipe 33 corresponding to the sub-pulse airflow introduction hole. A valve 42 is provided at an inlet of the sub-pulse inflow pipe 36 to the filter pipe 33. As shown in FIG. 5, a concave portion 33 b having a U-shaped cross section is formed on the inner wall 33 a of the filter tube 33 at a position corresponding to the sub-pulse airflow introduction hole 23.

As shown in FIG. 4, a delivery pipe 37 extends from the switching valve 41 and is connected to a recollection pipe 38.
The re-collection pipe 38 is provided at the bottom of the inner wall on the vertically downward side with the heater 3
9 and a degassing valve 43 on the side opposite to the heater section 39. Hereinafter, (1) exhaust gas flow path, (2) main pulse air flow path, (3) sub-pulse air flow,
(4) Processing of the re-collected fine particles will be described.

(1) The exhaust gas flowing from the exhaust gas inlet pipe 31 is supplied to the gas inlet 3 of each filter pipe 33 by the branch pipe 32.
4 is sent. The switching valve 41 provided at the gas inlet port 34 communicates the distribution pipe 32 and the filter pipe 33 when collecting fine particles in the exhaust gas, and the exhaust gas flows into the filter pipe 33 through the switching valve 41. The fine particles mainly composed of carbon in the exhaust gas are trapped in the fine holes formed in the inner wall of the exhaust gas filter 10, and the exhaust gas containing no fine particles passes through the fine holes in the inner wall and is discharged to the outside through the gas inlet / outlet 35. Is done. Valve 42 provided in sub-pulse inflow pipe 36
Prevents the exhaust gas from flowing into the sub-pulse inflow pipe 36 when collecting the fine particles in the exhaust gas.

(2) The main pulse airflow is ejected from the compressor to one of the two filter pipes 33 for about 0.1 second and then to the other filter 33 at intervals of several seconds. The switching valve 41 on the side of the filter pipe 33 from which the main pulse airflow is discharged communicates the distribution pipe 32 with the delivery pipe 37 extending from the switching valve 41. The main pulse airflow spouted into the filter tube 33 causes the fine particles trapped on the inner wall of the exhaust gas filter 10 to separate from the exhaust gas filter 10,
The particulate collection capability of the exhaust gas filter 10 is regenerated. The separated fine particles are sent out to the recollecting tube 38 through the sending tube 37 by the ejection pressure of the main pulse airflow. The switching valve 41 on the side of the filter pipe 33 from which the main pulse airflow does not flow is
The flow pipe 32 communicates with the filter pipe 33, and the exhaust gas flows into the filter pipe 33. In the exhaust gas filter 10 housed in the filter tube 33, the collection of fine particles is performed. The ejection of the main pulse airflow to the two filter tubes 33 is periodically executed at intervals of about three minutes. The ejection of the main pallet airflow and the outflow of exhaust gas at the gas inlet / outlet 35 are controlled by a switching valve (not shown).

(3) The sub-pulse airflow is alternately ejected from the compressor 26 to the filter pipe 33 in synchronization with the main pulse airflow. At this time, the valve 42 communicates the sub-pulse inflow pipe 36 with the filter pipe 33. Filter tube 3
The sub-pulse airflow squirted into the filter tube 3 flows into the concave portion 33b formed on the inner wall 33a of the filter tube 33, and
The fine particles flowing into the sub-pulse air flow introduction hole 23 from 3b and deposited on the inner wall of the gas flow hole 12 are separated. The separated fine particles are accumulated in the re-collection pipe 38 through the delivery pipe 37 by the ejection pressure of the sub-pulse air flow and the main pulse air flow.

The sub-pulse airflow and the main pulse airflow may be ejected irregularly and asynchronously. If the ejection times of the subpulse airflow and the main pulse airflow do not overlap, the separated fine particles will be ejected by the subpulse airflow or the main pulse airflow. The pressure is sent to the recollection tube 38 by pressure. (4) The fine particles accumulated in the re-collection pipe 38 fall by gravity and accumulate on the heater section 39, and are burned and removed by overheating of the heater section. The valve 43 is used for venting and taking in air of the recollection tube 38.

Next, the process of depositing fine particles by the exhaust gas in the exhaust gas filter and the effect of separating the fine particles by the main pulse air flow and the sub pulse air flow will be described with reference to FIGS.
A description will be given based on FIG. 7 and FIG. As shown in FIG. 6A, the gas flow hole 1 in which the first sealing portion 21 is formed
Exhaust gas flows from the end where the first sealing portion 21 is not formed, and flows into the gas circulation hole 12 where the second sealing portion 22 is formed through the fine hole formed in the inner wall 11. Then, the exhaust gas flows out from the end of the gas flow hole 12 where the second sealing portion 22 is formed, where the second sealing portion 22 is not formed. At this time, the fine particles mainly composed of carbon contained in the exhaust gas are trapped by the fine holes in the inner wall 11 and cannot pass through the inner wall 11, so that the exhaust gas filter 10
Does not leak from

As shown in FIGS. 6 (B) and 6 (C), the fine particles 24 which have begun to deposit immediately below the first sealing portion 21 fill the gas flow holes 12 and the deposition extends toward the exhaust gas upstream side. To go. As time elapses, the inner wall 11
4, the pores of the inner wall 11 are covered, and the pressure loss of the exhaust gas when passing through the exhaust gas filter 10 increases, and the efficiency of removing fine particles from the exhaust gas decreases. Therefore, it is necessary to remove the fine particles deposited on the inner wall at regular intervals.

As shown in FIGS. 7 and 8, the main pulse airflow is directly transmitted to the gas flow holes 12 where the fine particles 24 are deposited because the first sealing portion 21 is provided on the main pulse airflow ejection side of the exhaust gas filter 10. Cannot flow in. Therefore, the main pulse airflow flows into the gas flow holes 12 having the second sealing portions 22, passes through the fine holes in the inner wall 11, and flows into the gas flow holes 12 having the first sealing portions 21. The main pulse airflow that has flowed in causes the fine particles 24 deposited on the inner wall 11 to be separated, and the separated fine particles are sent out to the recollection tube by the pressure of the main pulse airflow.

However, the main pulse airflow is
Since the gas flows in parallel to the gas flow hole 12 having the sealing portion 22 and then flows into the gas flow hole 12 where fine particles are deposited through the fine holes in the inner wall 11, the main pulse air flow near the first sealing portion 21. Is difficult to flow, and the accumulation of the fine particles 24 remains near the first sealing portion 21 where the fine particles are most accumulated.

Therefore, the outer wall 1 penetrating toward the sub-pulse air flow introduction hole 23 located near the first sealing portion 21
When the sub-pulse airflow is ejected from the outside of the gas outlet 3, the sub-pulse airflow introduction holes 23 penetrate the inner wall 11 on the exhaust gas upstream side in the vicinity of the first sealing portion 21 in the same row. Fine particles 2 deposited near 21
4 is separated from the inner wall 11 by the ejection pressure of the subpulse airflow. The separated fine particles are sent to the re-collection pipe by the ejection pressure of the sub-pulse air flow and the main pulse air flow together with the fine particles separated by the main pulse air flow.

As described above, the sub-pulse airflow and the main pulse airflow may be ejected irregularly and asynchronously, and when the ejection times do not overlap, the fine particles separated by the respective ejection pressures are sent to the recollecting tube. . Next, a first method for manufacturing an exhaust gas filter will be described with reference to FIGS.

Steps (1) to (5) show a method of manufacturing the first sealing portion and the sub-pulse air flow introduction hole. (1) As shown in FIG. 9 (A), a sealing portion 20 having a depth of about 5 mm is formed at the end of all gas flow holes on the exhaust gas outflow side. (2) After drying, as shown in FIG. 9B, the sealing portions 20 of the gas flow holes in the same row are alternately removed with a saw blade or the like, and the depth is 30 m.
About m grooves 51 and 52 are formed.

(3) As shown in FIG. 9C, a packing 61 having a thickness of about 10 mm is packed in the entire bottoms of the formed grooves 51 and 52. (4) As shown in FIG. 9D, spaces other than the packing 61 of the grooves 51 and 52 are sealed. (5) Dry the exhaust gas filter, remove the packing, and fire. After the firing, as shown in FIG. 9E, the end of the exhaust gas filter is cut so that the sealing portion of the row in which the packing is not clogged does not remain. Thus, the first sealing portion 21 is formed in the same row direction, and the sub-pulse airflow introduction hole 23 is formed immediately below.

The method of manufacturing the second sealing portion will be described in steps (1) to (3). (1) As shown in FIG. 10A, grooves 53 and 54 having a depth of about 5 mm are formed in the row where the first sealing portions 21 are formed. (2) As shown in FIG. 10 (B), packings 61 are packed in the grooves 53 and 54, and rows in which the packings 61 are not packed are sealed.

(3) The exhaust gas filter is dried, fired after removing the packing. After firing, as shown in FIG.
The end of the exhaust gas filter is cut so that the grooves 53 and 54 do not remain. Next, a second method for manufacturing an exhaust gas filter will be described with reference to FIGS.

Steps (1) to (4) show a method of manufacturing the first sealing portion and the sub-pulse air flow introduction hole. (1) As shown in FIG. 11A, grooves 51 and 52 are formed alternately in the same row direction of the gas flow holes. (2) As shown in FIG. 11 (B), packing 61 is packed at the bottom of the formed grooves 51 and 52 so that a space for forming the first sealing portion is left above the grooves 51 and 52, and the exhaust gas filter is A mask plate 62 having a contour substantially the same as the cross-sectional contour is placed on the end face of the exhaust gas filter, and the periphery thereof is taped so as not to shift. The mask plate 62 is integrally formed so as to cover the gas flow holes in which the grooves 51 and 52 are not formed in the column direction with a plate-shaped cover plate, and not to cover the gas flow holes in which the grooves 51 and 52 are formed. I have.

(3) As shown in FIG. 11C, the remaining spaces of the grooves 51 and 52 filled with the packing 61 are sealed. (4) After drying the exhaust gas filter, the packing 61 and the mask plate 62 are removed as shown in FIG. Thus, the first sealing portion 21 and the sub-pulse airflow introduction hole 23 are formed immediately below the first sealing portion 21. The firing is performed after a second sealing portion described later is formed.

The method of manufacturing the second sealing portion will be described in steps (1) to (3). (1) As shown in FIG. 12 (A), a mask plate 62 is placed on the opposite side of the same row as the gas flow holes in which the first sealing portions 21 are formed. (2) As shown in FIG. 12B, the gas flow holes not covered with the mask plate 62 are sealed.

(3) As shown in FIG. 12C, the mask plate 62 is removed, dried and fired to form the second sealing portion 2.
2 are formed. In the first embodiment, a circular sub-pulse airflow introduction hole is formed by a drill or the like immediately below the first sealing portion sealed in the same row direction,
It is possible to manufacture exhaust gas filters. In the first embodiment, a sub-pulse airflow introduction hole is formed in the vicinity of the exhaust gas upstream side of the first sealing portion through the inner wall and the outer wall, and the subpulse airflow is jetted into the sub-pulse airflow introduction hole. As a result, the fine particles in the exhaust gas collected and deposited near the first sealing portion of the gas flow hole are separated, the fine particles collected by the exhaust gas filter are satisfactorily removed, and the exhaust gas filter is regenerated. Loss is reduced. further,
Since the separated fine particles are sent to a remote recollecting pipe at the pressure of the jet air to be burned and removed, it is possible to prevent the separated fine particles from returning to the exhaust gas filter.

FIG. 13 shows an exhaust gas filter according to a second embodiment of the present invention. In the second embodiment, the first sealing portion 121 and the second sealing portion 122 protrude outward from the end of the inner wall 111 toward the outside in the longitudinal direction of the gas flow hole, and the cross-sectional shape of the protruding portion is formed in a triangular shape. Have been. When the main pulse airflow enters, the main pulse airflow is rectified by the protrusion 121a having a triangular cross section of the first sealing portion 121, and can be blown into the gas flow hole 112 without colliding with the first sealing portion 121 and being reflected. . Therefore, disturbance of the main pulse airflow when the main pulse airflow blows into the exhaust gas filter 100 can be reduced.

Further, when the main pulse airflow and the subpulse airflow flow out of the gas flow pipe 112, the airflow flows out by diffusing along the surface of the protruding portion 122a of the second sealing portion 122, so that the separated fine particles are gaseous. Crosslinking near the airflow outlet of the flow hole 112 can be prevented. The projecting portion of the sealing portion of the second embodiment can have any shape as long as it regulates the inflowing exhaust gas and prevents the separated fine particles from bridging near the air flow outlet of the gas flow hole. is there.

The configuration, operation, and effects of the second embodiment other than those described above are the same as those of the first embodiment, and will not be described. The method for manufacturing an exhaust gas filter according to the second embodiment is similar to the method of manufacturing the exhaust gas filter, except that the sealing portion is cut in accordance with the shape of the projecting portion.
This is the same as the method for manufacturing the exhaust gas filter according to the first embodiment. FIG. 14 shows an exhaust gas filter according to a third embodiment of the present invention.
Shown in

The exhaust gas filter 200 is formed of a rectangular pillar-shaped honeycomb structure. The first sealing portions 221 are formed at the downstream end of the flow of exhaust gas in the same row in a substantially L-shape. The sub-pulse air flow introduction hole 223 is
In the vicinity where the first sealing portion 221 is formed, the inner wall 211 and the outer wall 213 in the column direction where the first sealing portion 221 is formed are removed, and formed so as to penetrate the exhaust gas filter 200 in a substantially L-shape. Have been. The second sealing portion (not shown) is formed in the other row of the row in which the first sealing section 221 is formed, in the same row in a substantially L-shape at the upstream end of the exhaust gas flow of the exhaust gas filter 200.

The main pulse airflow generated by the compressor 225 flows into the exhaust gas filter 200 from the exhaust gas flow hole 212 where the first sealing portion 221 is not formed, passes through the fine hole of the inner wall 211, and passes through the first sealing portion 221. Flows into the gas flow hole 212 in which is formed. The inflowing main pulse airflow separates the fine particles deposited on the inner wall 211, and the separated fine particles are sent to a recollecting tube (not shown).

The sub-pulse airflow generated by the compressor 226 blows out to the sub-pulse airflow introduction hole 223, and the first
The fine particles deposited near the sealing portion 221 are removed from the inner wall 211.
Peeled off. Sub-pulse airflow introduction hole 22 of substantially L shape
When the sub-pulse airflow collides with the inner wall 211 at the turning angle of No. 3, a part of the subpulse airflow changes the flow at right angles, and the other part is disturbed, and changes its direction, for example, toward the exhaust gas upstream side, and accumulates on the inner wall 211. The remaining fine particles are further peeled off.

In the embodiment of the present invention described above, the porous cordierite is used as the material of the exhaust gas filter. However, in the present invention, other ceramic materials such as DHC-221 green body type, mullite, alumina, silica and the like are used. It is possible to manufacture exhaust gas filters. Further, in the embodiment of the present invention, the sub-pulse airflow introduction holes are formed by removing the outer walls at both ends of the same row of sub-pulse airflow introduction holes, but in the present invention, the subpulse airflow introduction holes are formed by removing at least one outer wall. It is also possible. Furthermore, in the embodiment of the present invention, the shape of the exhaust gas filter is formed in a columnar shape and a rectangular column shape, and the row shape of the first sealing portion and the second sealing portion is formed in a linear shape or a substantially L shape. In the present invention, the shapes of the exhaust gas filter, the first sealing portion, and the second sealing portion are not limited to these.

[0039]

According to the exhaust gas filter of the present invention, the filter is formed of a honeycomb structure, a first sealing portion is formed in a part of a predetermined predetermined gas flow hole downstream of the exhaust gas, and the remaining gas flow hole of the same line is formed. Forming a second sealing portion on the exhaust gas upstream side of the hole,
A sub-pulse airflow introduction hole is formed by penetrating the inner wall of the exhaust gas filter in the column direction near the first sealing portion and penetrating at least one outer wall at both ends in the same column direction of the inner wall. For this reason, the gas flow is blown out to the gas flow hole, and the gas flow is blown out to the sub-pulse air flow introduction hole, whereby fine particles in the exhaust gas mainly composed of carbon trapped in the exhaust gas filter are removed well, and the exhaust gas is discharged. This has the effect of reducing pressure loss.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an exhaust gas filter according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a sectional view taken along line III-III in FIG. 2;

FIG. 4 is a schematic configuration diagram showing an exhaust gas treatment apparatus to which the exhaust gas filter according to the first embodiment of the present invention is applied.

FIG. 5 is a schematic enlarged view of a V-line portion in FIG. 4;

FIG. 6 is a schematic partial cross-sectional view showing the progress of accumulation of fine particles in exhaust gas in gas flow holes of an exhaust gas filter according to the first embodiment of the present invention.

FIG. 7 is a schematic sectional view showing the flow of a main pulse airflow and a sub-pulse airflow in FIG. 2 of the exhaust gas filter according to the first embodiment of the present invention.

8 is a schematic cross-sectional view showing the flow of a main pulse airflow and a sub-pulse airflow in FIG. 3 of the exhaust gas filter according to the first embodiment of the present invention.

FIG. 9 is a schematic partial cross-sectional view showing a first manufacturing method of the first sealing portion of the exhaust gas filter according to the first embodiment of the present invention.

FIG. 10 is a schematic partial cross-sectional view showing a first method of manufacturing the second sealing portion of the exhaust gas filter according to the first embodiment of the present invention.

FIG. 11 is a schematic partial sectional view showing a second method of manufacturing the first sealing portion of the exhaust gas filter according to the first embodiment of the present invention.

FIG. 12 is a schematic partial sectional view showing a second method of manufacturing the second sealing portion of the exhaust gas filter according to the first embodiment of the present invention.

FIG. 13 is a schematic partial sectional view showing an exhaust gas filter according to a second embodiment of the present invention.

FIG. 14 is a perspective view showing an exhaust gas filter according to a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Exhaust gas filter 12 Gas circulation hole 21 1st sealing part 22 2nd sealing part 23 Subpulse airflow introduction hole (airflow introduction hole) 25 Compressor (1st airflow generation means) 26 Compressor (2nd airflow generation means) 100 Exhaust gas filter 111 Inner wall 121 1st sealing part 122 2nd sealing part 123 Subpulse airflow introduction hole (airflow introduction hole)

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-58-196820 (JP, A) JP-A-1-159408 (JP, A) JP-A 63-93413 (JP, U) JP-A 4-96 69616 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) F01N 3/02 301

Claims (2)

(57) [Claims] An outer wall surrounding a side surface, and an inner wall of the outer wall.
An inner wall extending in the exhaust gas flow direction
And, the inner wall, and a honeycomb structure forming a number of gas flow holes through which exhaust gas flows by the outer wall and the inner wall, and a part of the gas flow holes, Continuously sandwiching the inner wall
A first sealing portion that seals an end on the exhaust gas downstream side in a predetermined same row of the gas flow holes formed by the adjacent gas flow holes, and an exhaust gas of the same row of the gas flow holes in the remaining portion of the gas flow holes. a second sealing portion for sealing the upstream end, the exhaust gas upstream vicinity of the first sealing portion of the honeycomb structure, the inner wall through the same column direction of the first sealing portion,
Exhaust gas filter, characterized in that it and a airflow introducing hole formed through at least one of the outer wall of the same column direction ends of said inner wall. 2. A first airflow generating means for generating an airflow flowing into the honeycomb structure from an exhaust gas downstream side of the honeycomb structure, and an airflow flowing into the airflow introduction hole from outside the outer wall of the honeycomb structure. The exhaust gas filter according to claim 1, further comprising: a second airflow generating unit that generates the airflow.