JP2003214142A - Diesel particulate removing device and diesel vehicle provided with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase a capture and removing rate of diesel particulate. <P>SOLUTION: This diesel particulate removing device is related to a two- cylinder capturing structure. Cylinders 9a and 9b (device body parts) respectively include cylindrical containers 18a and 18b having an inflow port and an outflow port for an diesel exhaust gas. Inside the cylindrical container 18a, a catalyst carrying spherical filter 11a, a rolled-up type metal filter 12a, a catalyst carrying spherical filter 13a, a metal filter 14a, and a catalyst carrying spherical filter 15a are arranged in this order from an introducing side of the diesel exhaust gas. Inside the cylindrical container 18b, a catalyst carrying spherical filter 11b, a rolled-up type metal filter 12b, a catalyst carrying spherical filter 13b, a metal filter 14b, and a catalyst carrying spherical filter 15b are arranged in this order from the introducing side of the diesel exhaust gas. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diesel particulate removing device and a diesel vehicle equipped with the removing device, and more specifically, to capturing particulates contained in exhaust gas of an internal combustion engine such as a diesel engine with a heater or a filter, The present invention relates to a diesel particulate removing device that burns and removes captured particulates to regenerate a filter, and a diesel vehicle including the removing device.

[0002]

2. Description of the Related Art Conventionally, attention has been paid to the regulation of exhaust gas from automobiles such as nitrogen oxide (NOx) mainly containing nitrogen dioxide which is a carcinogen. By the way, a large amount of carbon fine particles (so-called black smoke) are present in the exhaust gas of diesel vehicles, and after these carbon fine particles are discharged into the air through the exhaust passage, they fly in the air for a long time and finally As a result, it becomes soot and falls on the floor, road surface, clothes, etc. By the way, since carbon adsorbs well, various chemical substances such as carcinogen-related substances are adsorbed by carbon fine particles floating in the air, and human beings inhale these carbon fine particles to enter the human body. In recent years, reports have been made that cancer and respiratory diseases are caused. For this reason, now, not only nitrogen oxides (NOx), but emission control of particulate matter (PM) from diesel vehicles has become an important issue. Therefore, as a device for protecting the environmental air from diesel black smoke pollution, there is provided a black smoke collecting device in which a black smoke removing filter made of metal fibers or honeycomb-shaped elements is installed in the exhaust passage of a vehicle-mounted diesel engine. (Japanese Utility Model Laid-Open No. 61-55114, Japanese Utility Model Laid-Open No. 61-84851, etc.). However,
This type of black smoke removal filter has a drawback that if it is used for a long period of time, it will be clogged with the collected black smoke and the pressure loss will increase.

As means for eliminating the clogging of black smoke, Japanese Patent Application Laid-Open Nos. 2-173310 and 6-212954.
Japanese Patent Application Laid-Open No. 8-193509 and Japanese Patent Application Laid-Open No. 8-193509 propose diesel particle removing devices. As shown in FIG. 22, this type of device has an exhaust gas inlet 1 and outlet 2
, A ceramic heater 4a provided on the inlet 1 side in the cylindrical container 3, and a porous foam filter 4 disposed adjacent to the latter stage of the ceramic heater 4a.
b, and a catalyst-carrying filter 4c disposed adjacent to the latter stage of the porous foam filter 4b.

In such a structure, the exhaust gas introduced from the inlet 1 comes into contact with the ceramic heater 4a and ignites and burns, and unburned particles are captured and removed by the porous foam filter 4b and the catalyst-carrying filter 4c. At this time, the heat of the ceramic heater 4a and the exhaust gas is conducted to the porous foam filter 4b to ignite and burn the unburned particles captured by the porous foam filter 4b. In the catalyst-carrying filter 4c on the further downstream side, the conduction heat from the ceramic heater 4a and the exhaust gas decreases, so the temperature drops, but the catalyst carried by the catalyst-carrying filter 4c promotes the combustion of trapped particles. Therefore, many trapped particles are burned out at a relatively low temperature and the filter function is regenerated without causing misfire.

[0005]

However, in the above-mentioned conventional device, since the catalyst-carrying filter 4c is arranged on the downstream side of the ceramic heater 4a, the temperature of the catalyst-carrying filter 4c is high on the upstream side, and the downstream Tends to be low on the side. Therefore, the fine particles are likely to remain unburned in the downstream portion of the catalyst-carrying filter 4c, and the unburned fine particles clogging the catalyst-carrying filter 4c to increase the pressure loss, or in some cases, to a large amount of accumulated fine particles. There is a problem that the catalyst carrying filter 4c is damaged by ignition. Therefore, in order to eliminate the unburned particles, it is conceivable to increase the heat generation of the ceramic heater 4a and raise the temperature of the rear end portion of the catalyst-carrying filter 4c to the particle ignition temperature. The temperature of the end on the side exceeds the allowable temperature of the ceramic heater 4a, which leads to disconnection of the ceramic heater 4a and deterioration of durability. Therefore, in the conventional device, it is unavoidable to suppress the heat generation of the ceramic heater 4a and use the ceramic heater 4a. Therefore, the catalyst at the downstream end of the catalyst-carrying filter 4c is sufficiently activated. No
There is a problem that fine particles are likely to remain unburned at the end on the wake side.

The present invention has been made in view of the above-mentioned circumstances, and a diesel particulate remover capable of increasing the rate of trapping and removing particulates and reliably burning and removing the trapped particulates to regenerate the filter, and An object of the present invention is to provide a diesel vehicle equipped with the removing device.

[0007]

In order to solve the above-mentioned problems, the diesel particulate removing apparatus according to the invention of claim 1 is incorporated in a discharge path of a diesel engine,
The diesel exhaust gas has an inlet and an outlet having a both-end opening, and a metal filter that is attached to the container to capture the fine particles in the diesel exhaust gas. One or a plurality of metal plates having a large number of through-holes each having a surface projection are formed in a multilayered or multi-layered structure, and the diesel exhaust gas is introduced from the interlayer gap on one end side, and the other end is formed. It is characterized in that the diesel exhaust gas is stored in the container in such a manner that the diesel exhaust gas flows out from the side interlayer gap.

A second aspect of the present invention relates to the diesel particulate remover according to the first aspect, wherein the surface normal of the surface-mounted projection provided at the edge of the through hole is substantially upstream of the discharge path. It is characterized by being set to face.

A third aspect of the present invention relates to the diesel particulate remover according to the first or second aspect, wherein the metal filter comprises one or a plurality of the metal plates wound in a longitudinal direction or folded. It is characterized in that it is made to be multiplexed or multi-layered.

The invention according to claim 4 relates to the diesel particulate remover according to claim 1 or 3, wherein at least one metal plate is repeatedly undulated along the longitudinal direction of the metal plate. It is characterized in that an undulating region is provided.

A fifth aspect of the present invention relates to the diesel particulate remover according to the fourth aspect, characterized in that the undulating region is a region that undulates in an approximately triangular wave, approximately rectangular wave or approximately sine wave mode. There is.

A sixth aspect of the present invention relates to the diesel particulate remover according to the fourth or fifth aspect, wherein the through hole having a surface projection on the edge is provided at the peak of the unevenness of the undulating region. It is characterized by that.

The invention according to claim 7 relates to the diesel particulate remover according to claim 1, 2 or 3, wherein at least one metal plate is composed only of a flat surface, and the flat surface has an edge portion. It is characterized in that a large number of the above-mentioned through holes having surface projections are formed.

The invention according to claim 8 relates to the diesel particulate remover according to claim 1 or 2, wherein the plurality of through-holes have a first faced protrusion projecting outward from one surface at an edge portion. And a second through hole having a second surface protrusion protruding outward from the other surface, which is the back side of the one surface, at the edge portion. .

A ninth aspect of the present invention relates to the diesel particulate remover according to the first, second or eighth aspect, wherein the surface-mounted projection is bent at an upper portion thereof so that the ceiling portion or the eaves with respect to the through hole. It is characterized in that it constitutes a section.

[0016] A tenth aspect of the present invention relates to the diesel particulate remover according to the first, second or eighth aspect, wherein the surface projection is formed in a roof shape or an eave shape with respect to the through hole. Is characterized by.

The invention according to claim 11 relates to the diesel particulate remover according to claim 1, 2 or 8, wherein the sum of the opening areas of all the through holes is referred to as the total opening area. The ratio of total open area to surface area is 15
It is characterized in that it is set in the range of 50% to 50%.

A diesel vehicle according to a twelfth aspect of the present invention is characterized by comprising one or a plurality of the diesel particulate removing devices according to any one of the first to eleventh aspects.

The invention according to claim 13 relates to the diesel vehicle according to claim 12, in which unburned particles captured by the metal filter are ignited in the process of being contained in the diesel exhaust gas and being discharged. It is characterized in that the diesel particulate removing device is attached to a position on the exhaust path where the metal filter is exposed to a diesel exhaust gas atmosphere of a temperature high enough to be burned and removed.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. The description will be specifically made using the embodiments. First Embodiment FIG. 1 is a schematic sectional view showing a schematic configuration of a two-cylinder type diesel particulate removing device (hereinafter, also referred to as a two-cylinder type device) according to a first embodiment of the present invention, and FIG. Front view, Figure 3
4 is a diagram for explaining a mounting structure in which the device is mounted on an exhaust pipe of a diesel engine of a diesel vehicle, FIG.
FIG. 5 is a schematic front view of a metal filter that constitutes the same two-cylinder device, FIG. 5 is a partially cutaway exploded view showing the structure of a corrugated metal plate of the same metal filter, and FIG. 5 is a partially cutaway enlarged view showing a part A of FIG. 5 by partially breaking it, $ 78 FIG. 7 is a partially broken development view showing a partially broken structure of the flat metal plate of the same metal filter, FIG. 8 is a partially cutaway enlarged view showing a part B of FIG. 7 in an enlarged manner.

The two-cylinder device 5 of this example is mounted on a diesel vehicle as shown in FIG. 3 and is used immediately after the diesel engine 6, and as shown in FIG. 1 and FIG. Hollow branch 7 having one inlet 7c for diesel exhaust gas and two outlets 7a, 7b, two inlets 8a, 8b for diesel exhaust gas and one outlet 8
hollow confluence part 8 having c and outlet 7 of hollow branch part 7.
a and 7b and two inflow ports 8a and 8b of the hollow confluence portion 8 are sandwiched in a communicating state, and are roughly configured from two apparatus main body portions (hereinafter, also simply referred to as cylinders) 9a and 9b having the same configuration. . In addition, a collision plate S is provided inside the hollow branch portion 7 in order to decelerate the diesel exhaust gas introduced at a high speed from the inflow port 7c and evenly disperse it to the outflow ports 7a and 7b. There is.

As shown in FIG. 3, the two-cylinder type device 5 is mounted on a large diesel vehicle having a total vehicle weight of, for example, about 10 tons, and is mounted immediately after an eight-cylinder diesel engine 6 via an exhaust pipe L. Then, the high-temperature diesel exhaust gas discharged from the diesel engine 6 is introduced into the device main body portions 9a and 9b. A metal filter, for example, which will be described later, disposed in the apparatus main body portions 9a and 9b is included in the diesel exhaust gas and is discharged in the process of inflow port 7c.
The unburned particles captured by the metal filter are exposed to a high-temperature diesel exhaust gas atmosphere that is ignited, burned, and removed. The two-cylinder device 5 of this example also has a muffling function, and the diesel exhaust gas from which unburned particles have been burned and removed goes out of the vehicle as it is from the outlet 8c without passing through a muffler. Is discharged.

The apparatus main body portions 9a, 9b are arranged such that the catalyst-supporting spherical filters 11a, 1b are arranged from the diesel exhaust gas introduction side.
1b, rolled-up (see FIG. 4) metal filters 12a, 1
2b, catalyst-supporting spherical filters 13a, 13b, metal filters 14a, 14b, catalyst-supporting spherical filters 15a, 1
The catalyst-supporting spherical filters 11a and 11b and the metal filter 12 are composed of a five-layer trap structure arranged in the order of 5b.
a, 12b, catalyst-supporting spherical filters 13a, 13b, metal filters 14a, 14b, catalyst-supporting spherical filter 15
a and 15b are diesel exhaust gas inlets 16a and 1
Cylindrical container 18 having 6b and outlets 17a, 17b
It is stored in a and 18b. The catalyst-supporting spherical filters 11a and 11b are spherical filters made of ceramic or alumina and carrying a catalyst for promoting combustion of trapped fine particles.

The metal filters 12a and 12b are arranged in the subsequent stage adjacent to the catalyst-supporting spherical filters 11a and 11b, and as shown in FIG.
1 and a flat metal plate 22 having a flat plate shape are spirally wound up in a state of being overlapped with each other. Metal filter 1
2a and 12b are long holes in which a large number of rectangular through holes Ha, Hb, ... As shown in FIGS. 5 and 6 are formed by subjecting a strip-shaped metal flat plate to, for example, pressing or roller pressing. A plate-shaped flat metal in which a directional wave-shaped corrugated metal plate 21 is formed, and a large number of rectangular through holes Ka, Kb, ... Are formed in a strip-shaped metal flat plate as shown in FIGS. Board 2
2 is formed, and the corrugated metal plate 21 and the flat metal plate 22 thus obtained are stacked, and the corrugated metal plate 21 and the flat metal plate 22 are oriented in the longitudinal direction, as shown in FIG. As shown, it is created by rolling up in a spiral shape.

As shown enlarged in FIG. 6, the corrugated metal plate 2
The through-hole Ha formed in 1 has four triangular faced barbs (faced protrusions) pa that are bent from the surface to the outside of the surface and project at the edge. Further, the through hole Hb has four triangular faced barbs (faced protrusions) pb that are bent from the back face to the outside of the back face and project. Also, FIG.
As shown in the enlarged view, the through hole Ka formed in the flat metal plate 22 has four triangular faced barbs qa bent outward from the surface to the surface side. The through hole Kb has a triangular shape 4 bent from the back surface to the outside of the back surface.
It has two faced thorns qb.

In this example, the through holes Ha and Hb of the corrugated metal plate 21 and the through holes Ka and Kb of the flat metal plate 22 are approximately 0.5 mm square. Further, the wave-shaped metal plate 21 of the total opening area of the wave-shaped metal plate 21 (the sum of the opening areas of all the through holes Ha and Hb formed in the wave-shaped metal plate 21)
The ratio of one surface area to one surface (aperture ratio) is preferably 1
It is set in the range of 5% to 50%, more preferably in the range of about 20% to about 30%. In this example, it is set to approximately 24%. Similarly, flat metal plate 2
2, the total opening area of the flat metal plate 22 (flat metal plate 22
Ratio of the opening area of all the through holes Ka and Kb formed on the surface) to the surface area of one side of the flat metal plate 22 (aperture ratio)
Is preferably set in the range of 15% or more and 50% or less, more preferably in the range of about 20% or more and about 30% or less. In this example, it is set to approximately 24%. In addition, four faced barbs pa, pa provided in the through hole Ha,
Have triangular shapes that are substantially congruent with each other. Through hole K
The same applies to the faced spines qa and qb of a and Kb.

Here, the through holes Ha, Hb, Ka, Kb are provided in order to enable the diesel exhaust particulates to move in the radial direction of the filter and to increase the probability of collision with the filter and the retention time in the filter. Also, faced thorns pa, pb, q
The provision of a and qb is to compensate for the reduction of the contact area due to the provision of the through holes Ha, Hb, Ka, Kb, to increase the probability of filter collision of diesel exhaust particles, and to prevent the diesel exhaust particles from going straight. This is to block and extend the residence time in the filter. Further, the corrugated metal plate 21 and the flat metal plate 22 are laminated because the corrugated metal plate 21 has a corrugated front surface (or a back surface) and a flat metal plate 22 that contacts the top (bottom) of the corrugated metal plate 21. With the flat surface (or the back surface), a large number of columnar gaps J (see FIG. 4) are formed along the axial direction of the filter in a state where the volumes are substantially equalized to make the flow of diesel exhaust gas uniform. This is for reducing the bias of the heating temperature in the metal filters 12a and 12b, and improving the trapping efficiency and the combustion efficiency of the fine particles.

Further, in this example, from the viewpoint of increasing the collision probability of diesel exhaust particulates, the catalyst-supported spherical filters 11a and 11b to the metal filters 12a and 12 are used.
Each of the fine particles introduced into the gap b must have one or more through-holes Ha, Hb, Ka, and Kb having faced barbs pa, pb, q.
It is configured so that it can block straight ahead by a and qb. In this example, as the material of the corrugated metal plate 21 and the flat metal plate 22, for example, stainless steel having a thickness of about 40 μm (SUS304 (C: 0.08% or less, Si: 1.00% or less, Mn: 2.00%
Or less, P: 0.045% or less, S: 0.030% or less, Ni: 8.00% to 10.50%, C
r: 18.00% to 20.00%)) band-shaped metal plate. Catalyst-supported spherical filters 13a, 13b (15a, 15b)
Both have the same structure as the catalyst-supporting spherical filters 11a and 11b, and the metal filters 12a and 12b (14a, 1b)
4b) is arranged in the subsequent stage. The metal filters 14a and 14b are the metal filters 12a and 12b.
With the same structure as the catalyst-supporting spherical filters 13a, 1
It is arranged in the subsequent stage adjacent to 3b.

In the diesel vehicle equipped with the two-cylinder type device having the above-mentioned structure, when the high temperature diesel exhaust gas flows through the inside of the apparatus main body portions 9a, 9b, the catalyst-supporting spherical filter 1
The catalyst is activated by exposing 1a and 11b to high temperature exhaust gas, and in this state, the fine particles are
Catalyzed and captured by the catalyst-supporting spherical filters 11a and 11b,
The trapped particles are ignited and burned to be removed. Metal filter 12
The a and 12b are exposed to a diesel exhaust gas atmosphere that has become much hotter due to the heat of catalytic reaction. That is, the metal filters 12a and 12b are
Ignite unburned particles captured by 2a, 12b,
It is exposed to a diesel exhaust gas atmosphere at a temperature high enough to be burnt and removed, and is sufficiently heated. As a result, when the unburned fine particles not removed by the catalyst-supporting spherical filters 11a, 11b are contact-trapped by the metal filters 12a, 12b in this state, they are ignited and burned and removed.

The fine particles are also ignited and burned and removed in the same manner as described above when the surfaced barbs pa, pb, qa and qb are used. The fine particles that collide with the faced thorns pa, pb, qa, and qb are
Even if they are not captured by these, they are repelled and the through hole H
Since the chance (probability) of contact with the metal filters 12a, 12b increases while moving from the gap J to the gap J via a, Hb, Ka, Kb, the particle contact rate is significantly improved as compared with the conventional one. . As a result, the probability of burning is significantly improved, and the amount of unburned fine particles passing through the metal filters 12a and 12b is significantly reduced. Here, the gaps J, J, ... Formed between the corrugated metal plate 21 and the flat metal plate 22 are
The volume is made substantially uniform, and, for example, simply the corrugated metal plate 2
Compared with the case where gaps having various cross-sectional areas are formed when the ones are overlapped with each other, the flow of diesel exhaust gas is more uniform over all the gaps, and the metal filter 1
The bias due to the position of heat applied to 2a and 12b is reduced, and the trapping efficiency and combustion efficiency of fine particles are also improved.

The catalyst-supporting spherical filters 13a and 13b are
Hot diesel exhaust and metal filters 12a, 12
The temperature of the catalyst is activated by the conduction heat of b, which is higher than that of the metal filters 12a and 12b. In this state, even if there are unburned fine particles that have passed through the metal filters 12a and 12b, such unburned particles are not burned. When the fine particles are captured by the catalyst-supporting spherical filters 13a and 13b, they are ignited and burned and removed. Nevertheless, the catalyst-supported spherical filter 13
The unburned fine particles passing through a and 13b are the metal filter 1
When they are contact-trapped by 4a and 14b, they are ignited, burned and removed. In this case as well, the fine particles are ignited and burned to be removed when the surface is thorned. Furthermore, the metal filter 1
Even if there are unburned fine particles that have passed through 4a and 14b, the unburned fine particles will not be discharged into the high temperature diesel exhaust gas or the metal filter 14
When the catalyst comes into contact with the catalyst-supporting spherical filters 15a and 15b in which the catalyst is activated by the conduction heat of a and 14b, they are burned and removed.

As described above, according to the configuration of the first embodiment, since the surface pore shapes of the metal filters 12a, 12b (14a, 14b) are carefully devised, the trapping rate of fine particles can be increased. That is, through holes Ha, Hb, K
Since a and Kb are provided, it is possible to move diesel exhaust particulates in the radial direction of the filter to increase the probability of filter collision and the retention time in the filter, and also to provide faced barbs pa, pb, qa, and qb. Therefore, the probability of collision of the diesel exhaust particles with the filter can be increased, and the diesel exhaust particles can be prevented from going straight to prolong the residence time in the filter, so that the capture rate of the particles can be increased.

Further, the metal filters 12a, 12b (14
a, 14b) are formed by spirally winding the corrugated metal plate 21 and the flat metal plate 22 in a superposed state, so that the gap J formed between the corrugated metal plate 21 and the flat metal plate 22 is formed. Has a substantially uniform volume. For example, when the corrugated metal plates 21 are simply overlapped with each other, gaps having various cross-sectional areas are formed. Can be made more uniform over the gaps, the unevenness of the heating temperature in the metal filters 12a, 12b can be reduced, and the trapping efficiency of particles and the combustion efficiency can be improved. As described above, sufficient combustion efficiency of fine particles can be obtained without using a heater, so that it is not necessary to use a battery, and power can be saved. Further, in the diesel particulate remover of this example, since the particulates are burned and removed, cleaning of the filter is not necessary, and the cost and labor required for maintenance and maintenance of the diesel particulate remover can be reduced.

Second Embodiment FIG. 9 is an enlarged perspective view showing a part of a corrugated metal plate which constitutes a metal filter of a two-cylinder type apparatus according to a second embodiment of the present invention in an enlarged manner, and FIG. FIG. 10 is an enlarged perspective view showing a part of a flat metal plate forming the metal filter in an enlarged manner. The apparatus configuration of this example is largely different from that of the first embodiment described above. In the first embodiment, for example, a corrugated metal plate has four triangular faced barbs (pa, pb) at the edges. In contrast to the through hole Ha (Hb) having a rectangular shape, as shown in FIG. 9, two rectangular faced barbs e1 and e2 (f1,
f2) is provided with a through hole La (Lb), and, for example, in the case of a corrugated metal plate, the surface normals of the surface-bearing barbs e1, e2 (f1, f2) are substantially parallel to the axes of the cylindrical containers 18a, 18b. That is, it is stored in the cylindrical containers 18a and 18b.

In this example, as shown in FIG. 9, the corrugated metal plate 21A is provided with through holes La and Lb. The through hole La has two rectangular surfaced barbs e1 and e2 that are bent from the surface to the outside of the surface. Here, the ratio Ae1: Ae2 of the area Ae1 of the surfaced barb e1 provided on the upstream side to the area Ae2 of the surfaced barb e2 provided on the downstream side is (Ae
1: Ae2 = 5: 5 to 7: 3).
Further, as shown in the figure, the through hole Lb has two rectangular faced barbs f1 and f2 that are bent from the back surface to the outside of the back surface. Here, the faced barb f1 provided on the upstream side
Area Af1 and area Af of faced barb f2 provided on the downstream side
The ratio Af1: Af2 to 2 is also (Af1: Af2 = 5: 5-7:
It is set within the range of 3). Further, in the figure, the arrow Z1 is parallel to the surface normals of the surfaced barbs e1, e2 and the surfaced barbs f1, f2, and the corrugated metal plate 21A is the cylindrical container 18a,
It shows the direction from the upstream side to the downstream side when stored in 18b.

Through holes Na and Nb are formed in the flat metal plate 22A, as shown in FIG. The through hole Na is
It has two rectangular surfaced barbs u1 and u2 that are bent at a substantially right angle from the surface to the outside of the surface. Here, the ratio Au1: Au2 of the area Au1 of the surfaced barb u1 provided on the upstream side to the area Au2 of the surfaced barb u2 provided on the downstream side is (Au1:
Au2 = 5: 5 to 7: 3). Further, as shown in the figure, the through hole Nb has two rectangular faced barbs v that are bent from the back surface to the outside of the back surface at a substantially right angle.
It has 1, v2. Here, the ratio Av1: Av2 of the area Av1 of the faced barb v1 provided on the upstream side and the area Av2 of the faced barb v2 provided on the downstream side is also (Av1: Av2 = 5: 5
It is set within the range of 7: 3). In the figure, the arrow Z2 is parallel to the surface normals of the faced barbs u1, u2 and the faced barbs v1, v2, and the flat metal plate 22A is the cylindrical container 18a, 1
It shows the direction from the upstream side to the downstream side when stored in 8b. Corrugated metal plate 21A and flat metal plate 22
A is in a state of being superposed and wound up in a spiral shape,
Faced thorns e1, e2, faced thorns f1, f2, faced thorns u1,
The surface normals of u2 and faced thorns v1, v2 are the cylindrical container 18
The cylindrical container 18a, so as to be parallel to the axes of a and 18b,
It is stored in 18b. Here, the faced thorn e1, the faced thorn f1, the faced thorn u1, and the faced thorn v1 are arranged on the upstream side.

As described above, according to the configuration of the second embodiment, it is possible to obtain substantially the same effect as that of the first embodiment.

[Third Embodiment] FIG. 11 is an enlarged view showing a part of a flat metal plate constituting a metal filter of a two-cylinder apparatus according to a third embodiment of the present invention. The apparatus configuration of this example is largely different from that of the first embodiment described above. In the first embodiment, for example, four faced barbs (qa, q) of one through hole Ka (Kb) are provided.
As for b), they are almost congruent with each other, while in FIG.
As shown in Fig. 4, the four faced barbs r of the through holes Ga (Gb)
The point is that the sizes of 1, r2, r3, and r4 (s1, s2, s3, s4) are different.

In this example, the through hole Ga formed in the flat metal plate is, as shown in FIG. 11, four triangular faced barbs r1, which are bent outward from the surface to the surface side. r2, r
3 and r4. Here, faced barbs r facing each other
Of 1 and r3, the size of one faced barb r1 is set to be relatively larger than the other faced barb r3. Also,
The faced barbs r2 and r4 facing each other are substantially congruent with each other. Further, the through hole Gb has four triangular surfaced barbs s1, s2, s3, s4 bent from the back surface to the outside of the back surface. Here, of the faced barbs s1 and s3 facing each other, the size of one faced barb s1 is set to be relatively larger than the other faced barb s3. The faced barbs s2 and s4 facing each other are substantially congruent with each other. In addition,
The corrugated metal plate is also provided with a through hole having a similar faced barb.

As described above, according to the configuration of the third embodiment, it is possible to obtain substantially the same effect as that of the first embodiment described above.

Fourth Embodiment FIG. 12 is a schematic sectional view showing the schematic construction of a two-cylinder type apparatus according to a fourth embodiment of the present invention. The device configuration of this example is
A big difference from the first embodiment described above is that, as shown in FIG. 12, an inner cylinder 32 for accommodating the metal filters 12a, 12b and the like is provided in the cylindrical container of the apparatus main body 31a, 31b.
inner cylinders 32a, 32 with a gap formed between a, 32b
The outer cylinders 33a and 33b for accommodating b are provided, and the heat insulating materials 34a and 34b made of, for example, glass wool are provided in the gap portion.
Is the point filled.

As described above, according to the configuration of the fourth embodiment, it is possible to reduce the heat dissipation from the inner cylinders 32a and 32b, so that the catalyst-supporting spherical filter housed in the inner cylinders 32a and 32b is provided. 11a, 11b, metal filter 12
a, 12b, catalyst-supporting spherical filters 13a, 13b, metal filters 14a, 14b, catalyst-supporting spherical filter 15
It is possible to keep a and 15b in a high temperature state and increase the combustion efficiency of fine particles.

[Fifth Embodiment] FIG. 13 is a schematic cross-sectional view showing a schematic configuration of a two-cylinder apparatus according to a fifth embodiment of the present invention. The device configuration of this example is
A major difference from the first embodiment described above is that, as shown in FIG. 13, catalyst-supporting spherical filters 15a, 15
The filters 35a and 35b made of metal fibers are provided in the subsequent stage of
Is provided to form a 6-layer trapping structure.

As described above, according to the structure of the fifth embodiment, further improvement in the particle removal rate can be expected.

Although the embodiment of the present invention has been described in detail above with reference to the drawings, the specific structure is not limited to this embodiment, and there are design changes and the like within a range not departing from the gist of the present invention. However, it is included in this invention. For example, the metal filter may be stored in the tubular container as close as possible to the extent that pressure loss does not cause a problem as back pressure applied to the engine. For example, it may be folded and used. In addition, in the above-described embodiment, the case where the apparatus main body portion has two cylinders has been described.
As shown in FIGS. 14 and 15, the apparatus main body portions 9a and 9b
In addition to the above, the apparatus main body portion 9c may be provided to form three cylinders. Also, four or more cylinders or a single cylinder may be used.

Further, in the above-mentioned embodiment, the case where the metal filters are arranged in two stages has been described, but the number of stages is not limited to two.
The number of steps may be one, or three or more. Moreover, you may connect and use in parallel. Moreover, the corrugated metal plate 21 and the flat metal plate 22 do not necessarily have to be overlapped over the entire area, but may be partially overlapped. Further, one of the corrugated metal plate 21 and the flat metal plate 22 may be omitted. Further, the corrugated metal plate does not necessarily have to be corrugated in the longitudinal direction. Further, instead of the corrugated metal plate 21, convex or / and concave portions are scattered over the whole or part thereof, and a large number of through holes having surface protrusions are formed in the edge portion. You may make it use a metal plate. Further, a part or all of the catalyst-supporting spherical filter may be omitted, or may be added as needed.

The number of faced thorns is not limited to four and may be three or two. Also, as shown in FIG.
Two faced barbs ta and ta that are bent from the surface to the front side outward and project at the edge of one through hole M, and two faced barbs that are bent from the back side to the back side outward and project. You may make it provide tb and tb. Further, in the above-mentioned embodiment,
The case where the corrugated metal plate 21 or the flat metal plate 22 is provided with a through hole having a triangular surfaced barb has been described, but the surfaced projection also includes a side wall. That is, as shown in FIG. 17, a through hole ha having an annular side wall Wa projecting outward from the front surface to the front surface side along the entire circumference of the peripheral edge and the entire circumference of the peripheral edge from the back surface to the back surface side outward. A large number of second through holes hb having projecting annular side walls Wb may be provided.

The side walls Wa and Wb do not necessarily have to be provided all around the peripheries of the through holes ha and hb, and a single or plural side walls may be provided at a part of the peripheries. , Hb may be formed in an overhang shape in the outer peripheral direction. Further, the surface projection includes a projection provided with a ceiling portion or an eaves portion. That is, as shown in FIG. 18, the through-holes have eave-shaped ceilings Ca, Cb.
The through holes ha and hb may be provided, or the through holes ha and hb with the lateral hole ceilings Ya and Yb may be provided as shown in FIG. 19, and the inclined ceilings Sa and S may be provided as shown in FIG.
It may be through holes hc, hd, ... With b (tilt type). These eave-shaped ceilings Ca, Cb, lateral hole ceilings Ya, Y
The directions of b and the inclined ceilings Sa and Sb are preferably oriented in various directions, and through holes of various shapes may be mixed. The density of the through holes is also arbitrary.

The case where both the through-holes of the corrugated metal plate and the through-holes of the flat metal plate are set to have relatively fine meshes of about 0.5 mm square, of course, this set value is of course used. Not exclusively. In addition, both of the through-holes of the corrugated metal plate and the through-holes of the flat metal plate may have a relatively coarse mesh size, or one of them may have a relatively fine mesh and the other may have a relatively coarse mesh. May be. Also, of the corrugated metal plate and the flat metal plate,
One of the through holes may have a rectangular shape, and the other through hole may have a circular shape, or both may have a circular shape. Also, the fourth
In the embodiment, the inner cylinders 32a and 32b and the outer cylinders 33a and 33b.
Insulating material 34a made of glass wool in the gap between
Although the case of filling 34 is described, the air layer may be simply provided without filling the heat insulating material.

Further, in the above-described embodiment, the case where the two-cylinder type device 5 having one inflow port and one outflow port is arranged immediately after the diesel engine 6 has been described, but as shown in FIG. The two-cylinder device 5A having two inlets and outlets may be connected immediately after the diesel engine 6 via separate exhaust pipes L1 and L2. Thereby, reliability can be improved. Further, as shown in the figure, the muffler 41 may be arranged at the subsequent stage of the two-cylinder device 5A. Further, as the collision plate, a flat plate-shaped member may be used as it is, or a flat plate-shaped member provided with a large number of through holes by, for example, punching may be used.

[0051]

As described above, according to the diesel particulate matter removing apparatus of the present invention, the trapping rate of particulates can be increased and the trapped particulates can be reliably burned and removed to regenerate the filter.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing a schematic configuration of a two-cylinder type diesel particulate removing device that is a first embodiment of the present invention.

FIG. 2 is a front external view of the same.

FIG. 3 is a view for explaining a mounting structure in which the device is mounted on an exhaust pipe of a diesel engine of a diesel vehicle.

FIG. 4 is a schematic front view of a metal filter that constitutes the same device.

FIG. 5 is a partially cutaway development view showing the structure of a corrugated metal plate of the same metal filter by partially breaking it.

6 is a partially cutaway enlarged view showing an enlarged part A of FIG.

FIG. 7 is a partially cutaway development view showing the structure of a flat metal plate of the same metal filter by partially breaking it.

FIG. 8 is a partially cutaway enlarged view showing a part B of FIG. 7 in an enlarged manner.

FIG. 9 is an enlarged perspective view showing, in an enlarged manner, a part of a corrugated metal plate that constitutes a metal filter of a two-tube device according to a second embodiment of the present invention.

FIG. 10 is an enlarged perspective view showing a part of a flat metal plate forming the same metal filter in an enlarged manner.

FIG. 11 is an enlarged view showing a part of a flat metal plate that constitutes a metal filter of a two-cylinder device that is a third embodiment of the present invention.

FIG. 12 is a schematic cross-sectional view showing a schematic configuration of a two-cylinder device that is a fourth embodiment of the present invention.

FIG. 13 is a schematic sectional view showing a schematic configuration of a two-cylinder device that is a fifth embodiment of the present invention.

FIG. 14 is a front external view of a three-cylinder device that is a modification of the first embodiment of the present invention.

FIG. 15 is a perspective view of the same three-cylinder device.

FIG. 16 is a partially enlarged view schematically showing a partially enlarged flat metal plate according to another modification of the first embodiment of the present invention.

FIG. 17 is a partially enlarged view schematically showing a partially enlarged flat metal plate according to still another modification of the first embodiment of the present invention.

FIG. 18 is a partially enlarged view schematically showing a partially enlarged flat metal plate according to still another modification of the first embodiment of the present invention.

FIG. 19 is a partially enlarged view schematically showing a partially enlarged flat metal plate according to still another modification of the first embodiment of the present invention.

FIG. 20 is a partially enlarged view schematically showing a partially enlarged flat metal plate according to still another modification of the first embodiment of the present invention.

FIG. 21 is a view for explaining a mounting structure in which a two-cylinder device that is still another modification of the first embodiment of the present invention is mounted on an exhaust pipe of a diesel engine.

FIG. 22 is a diagram for explaining a conventional technique.

[Explanation of symbols]

5 Diesel Fine Particle Removal Device 7 Hollow Branch 8 Hollow Confluence 12a, 12b, 14a, 14b Metal Filters 11a, 11b, 13a, 13b, 15a, 15b
Catalyst-supported spherical filters 18a, 18b Cylindrical container 21 Corrugated metal plate 22 Flat metal plates 34a, 34b Heat insulating materials Ha, Hb, Ka, Kb, La, Lb, Na, Nb Through holes pa, pb, qa, qb, e1, e2, f1, f2, u1, u
2, v1, v2 faced thorn (faced protrusion)

Claims (13)

[Claims] 1. A container, which is installed on a discharge path of a diesel engine and has both ends of an opening and an outlet of a diesel exhaust gas, and a container which is installed in the container and traps fine particles in the diesel exhaust gas. And a metal filter for carrying out, wherein the metal filter is formed by multiplexing or multi-layering one or a plurality of metal plates each having a large number of through holes each having a surface projection at an edge portion, A diesel particulate remover installed in the container in a manner that the diesel exhaust gas is caused to flow in through an interlayer gap on the other side and the diesel exhaust gas is caused to flow out through an interlayer gap on the other end side. 2. The surface normal of the surface-mounted projection provided on the edge portion of the through hole is set so as to be oriented substantially upstream of the discharge path. Diesel particulate removal device. 3. The metal filter according to claim 1, wherein one or a plurality of the metal plates are rolled up or folded in the longitudinal direction to be multiplexed or multilayered. 2. The diesel particulate remover according to 2. 4. The undulation region which repeats undulations along the longitudinal direction of the metal plate is provided in all or part of at least one metal plate.
The diesel particulate removal device described. 5. The diesel particulate matter removing apparatus according to claim 4, wherein the undulating region is a region that undulates in an approximately triangular wave, approximately rectangular wave, or approximately sine wave mode. 6. The diesel particulate remover according to claim 4 or 5, wherein the through hole having a surface protrusion on the edge is provided at a peak of the unevenness of the undulating region. 7. The at least one metal plate is composed of only a flat surface, and the flat surface is provided with a large number of the through holes having surfaced projections at the edges thereof. Two
Alternatively, the diesel particulate removal device according to item 3. 8. The plurality of through-holes have a first through-hole having, at an edge portion thereof, a first surfaced projection protruding outward from one surface, and the other surface which is a back side of the one surface. 3. The diesel particulate remover according to claim 1 or 2, further comprising a second through hole having a second surface-shaped protrusion protruding outward from the edge. 9. The diesel particulates according to claim 1, 2 or 8, wherein an upper portion of the surface-shaped projection is bent to form a ceiling portion or an eaves portion with respect to the through hole. Removal device. 10. The diesel particulate remover according to claim 1, 2 or 8, wherein the surface-shaped projection is formed in a roof shape or an eave shape with respect to the through hole. 11. When the sum of the opening areas of all the through holes is referred to as a total opening area, the ratio of the total opening area to the one-sided surface area of the metal plate is set to be 15% or more and 50% or less. The diesel particulate remover according to claim 1, 2 or 8. 12. The method according to any one of claims 1 to 11.
A diesel vehicle characterized by comprising a single or a plurality of the diesel particulate remover described in (1). 13. The unburned particles captured by the metal filter are ignited in the process of being contained in the diesel exhaust gas and being discharged, and the unburned particles are burned under a high temperature diesel exhaust gas atmosphere. 13. The diesel vehicle according to claim 12, wherein the diesel particulate remover is attached to a position on the exhaust path where the metal filter is exposed.