JP3321695B2 - Device for preventing clogging of particulate trap filter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an apparatus for preventing clogging of a particulate trap filter for trapping particulates contained in exhaust gas by a filter.

[0002]

2. Description of the Related Art Conventionally, in particular, in diesel engines and the like, particulates (exhaust particulates) contained in exhaust gas.
A trap filter (hereinafter referred to as a trap filter) is interposed in the exhaust passage in order to collect air. In such a trap filter, when the trapped particulates increase, the trap filter becomes clogged, the exhaust pressure increases, and the engine performance decreases. For this reason, there is a particulate trap filter regenerating apparatus which burns and removes the particulates trapped in the trap filter to regenerate the trap filter (see, for example, JP-A-2-104912).

[0003]

When the exhaust gas is introduced into the trap filter, the following substances flow into the trap filter. (1) Gas, particulates, and unburned air generated by combustion in the cylinder. (2) Rust generated from the inner circumference of the exhaust passage or the muffler (if the muffler is installed upstream of the trap filter). (3) Wear powder on the sliding part of the engine. (4) Dust that passes through the air cleaner, enters the engine from the intake side, and goes out to the exhaust side without burning. Of the substances (1) to (4), most of the substances except gas are collected by the trap filter. When the exhaust gas is heated by a combustion device and introduced into the trap filter to perform a regeneration process, the temperature of the trap filter rises to about 600 to 800 ° C, and most of the trapped substances are burned and removed. .

[0004] However, at the temperature of the trap filter at the time of the above-mentioned regenerating process, the metal remains in the substance collected by the trap filter without burning. Therefore, if a trap filter provided with this regenerating device is used for a long period of time, the residual metal will gradually accumulate in the trap filter, causing the trap filter to be clogged. Then, the exhaust pressure increases, and the fuel efficiency and drive feeling deteriorate. Therefore, it is necessary to clean the trap filter with air or replace the trap filter. As described above, the conventional apparatus has a problem that the maintenance work of the trap filter is complicated and the life of the trap filter is short.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and is intended to improve the maintainability of the trap filter and extend the life thereof by reducing the amount of metal flowing into the trap filter. An object of the present invention is to provide a device for preventing clogging of a curated trap filter.

[0006]

According to the first aspect of the present invention, it is possible to prevent clogging of a trap filter which is interposed in an exhaust passage and collects particulates contained in exhaust gas. in clogging preventing device of the particulate trap filter, the trap Fi
A combustion device provided in the exhaust passage upstream of the trap filter, one end of the cylindrical member facing the upstream inside the exhaust passage upstream of the trap filter, and an outer periphery of the one end and the upstream side Collection means having a gap between the inner wall of the exhaust passage and the outer end of the other end and the inner wall of the upstream exhaust passage fixed; and A collection port provided at a position upstream of the fixed portion and close to the fixed portion, and a box-shaped member provided with an opening at an upper portion, and the opening communicates with the collection port. look including a storage means which is fixed to the outside of the upstream-side exhaust passage Te, the collection hand
The central part of the cylindrical member of the step is smaller than the inner diameter of the exhaust passage.
Outer diameter and gradually decreases toward the upstream end.
It is characterized by having a shape that becomes smaller .

According to this configuration, when the exhaust gas discharged from the engine flows from the upstream side of the exhaust passage toward the trap filter, the exhaust gas contains the above-described particulates, metals, and the like, and the exhaust gas contains the exhaust gas. While rotating in the axial direction of the exhaust passage. Due to the rotational movement of the exhaust gas, a centrifugal force according to the mass acts on the material in the exhaust gas, and the material having a large mass moves along the inner wall of the exhaust passage. Therefore, substances such as particulates having a small mass move downstream while rotating near the center of the exhaust passage, and small metal powders among metals having a large mass move downstream while rotating along the inner wall of the exhaust passage. Then, the large pieces of metal move downstream along the bottom of the inner wall of the exhaust passage. When these substances reach the trapping means having one end fixed to the inner wall of the exhaust passage upstream of the trap filter, the substances move outside the outer periphery of the upstream end of the trapping means, that is,
Many heavy metals are collected by the collecting means. When the collected metal enters the narrow space between the inner wall of the exhaust passage and the collecting means, the flow of the exhaust gas is weakened in that space. Go down to the bottom. At the lowermost part of the exhaust passage, upstream of the fixed part of the collecting means and at a position close to the fixed part, there is a collecting port, and the opening of the storing means communicates with the collecting port and is fixed. Therefore, the collected metal enters the storage means from the collection port and is stored. Therefore, substances such as particulates in the exhaust gas flow into the trap filter without being trapped by the trapping means, and many metal powders and metal pieces in the exhaust gas do not flow into the trap filter but to the storage means. It will accumulate. Also, the putty that has flowed into the trap filter
And other substances are discharged from the combustion equipment.
It is burned and removed by the heat of the air.

[0008] According to the invention described in claim 2, according to claim 1 of the present invention.
In the configuration of the invention described in (1), the storage means has an opening area of the opening smaller than an area of a horizontal cross section of the box-shaped member. According to this configuration, in the first aspect of the present invention, the flow of the exhaust gas in the storage unit is disturbed by making the opening area of the opening of the storage unit smaller than the area of the horizontal section of the box-shaped member. This prevents the stored material from flowing backward and flowing into the trap filter.

According to a third aspect of the present invention, in the configuration of the first or second aspect, the storage means is provided with a storage material outlet in the box-shaped member, and is attached to and detached from the storage material outlet. It is characterized in that a lid fixed as possible is attached. According to such a configuration, in the invention according to claim 1 or 2, the storage means is provided with the stored material discharge port and the removable lid at the stored material discharge port, so that the stored material stored in the storage means can be removed. It will be easily discharged.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a configuration in which the present invention is applied to a trap filter provided with a full-flow regenerator. In FIG. 1, an exhaust pipe 1 is connected to an engine (not shown), and exhaust g generated by the engine flows from the upstream to the downstream (in the direction of the arrow) in the exhaust pipe 1. In the middle of the exhaust pipe 1, a filter case 2 having a collecting port 2A described below is interposed.
Inside, is mounted, for example, a SiC filter 3 as a trap filter for collecting particulates in exhaust gas. Therefore, the exhaust passage is constituted by the exhaust pipe 1 and the filter case 2. A burner 4 is provided in the exhaust pipe 1 upstream of the filter case 2. During regeneration of the SiC filter 3, the burner 4 is supplied with fuel f and auxiliary combustion air a from a fuel supply device and auxiliary air supply device 4A (not shown), and is ignited by an ignition electrode 4B to raise the temperature of the exhaust g. . The heated exhaust g flows into the filter case 2.

A collecting ring 5 is fixed to the filter case 2 on the upstream side of the SiC filter 3 as collecting means for collecting metal in the exhaust gas g. Collection ring 5
Is a cylindrical member whose central portion has an outer diameter smaller than the inner diameter of the filter case 2 and whose outer diameter gradually decreases toward the upstream end, and the other end of the cylindrical member is moved outward by L. The L-shaped end is fixed along the inner wall of the filter case 2. At the lowermost part of the filter case 2, at the position upstream of the fixed part at the other end of the collecting ring 5 and close to the fixed part, the above-described collecting port 2A is provided. The storage box 6 as a storage means is fixed outside the filter case 2 at the position. Reservoir 6
Is a sectional view of the vicinity of the storage box 6 in FIG.
As shown in the -I cross-sectional view, an opening 6B is provided in a part of the upper surface of the rectangular parallelepiped box-shaped member 6A, and
As a lid 6D that covers the stored material discharge port 6C from the outside,
It is detachably attached to the side surface of the box-shaped member by a plurality of screws 6E.

Next, the operation of this embodiment will be described. The exhaust g discharged from the engine contains the above-mentioned substances such as particulates, rust, abrasion powder, etc., and rotates in the exhaust pipe 1 from the upstream side of the exhaust pipe 1 toward the filter case 2. 1 flows in the axial direction. In general, exhaust pipes connected to an engine are bent at various places and are piped, and it is considered that the exhaust gas flowing in the exhaust pipes usually flows while rotating. Due to the rotation of the exhaust g, a centrifugal force corresponding to the mass acts on the substance in the exhaust g, and the substance having a large mass moves along the wall of the exhaust pipe 1.
Therefore, a substance such as a particulate having a small mass moves toward the filter case 2 while rotating near the center of the exhaust pipe 1. On the other hand, among substances such as metals having a large mass, small metal powder moves in the direction of the filter case 2 while rotating along the vicinity of the pipe wall of the exhaust pipe 1, and large metal pieces are formed on the pipe wall of the exhaust pipe 1. It moves toward the filter case 2 along the bottom. When the substance distributed in the exhaust pipe 1 reaches the position of the collection ring 5 fixed along the inner wall of the filter case 2, the material is distributed outside the outer periphery on the upstream side of the collection ring 5. 2 and FIG. 3, that is, most of the metal powder and the metal pieces collide with the L-shaped portion of the collection ring 5 and move to the collection ring 5. Collected in. Since the flow of the exhaust gas g is weak in the collection region S, the collected metal descends along the collection ring 5 and the wall surface of the filter case 2 due to gravity, and falls to the lower portion of the filter case 2. There is a collection port 2A at the bottom of the filter case 2, and the collection port 2A is fixed by communicating with the opening 6B of the storage box 6, so that the metal dropped to the lower part of the filter case 2 is It enters the storage box 6 from the collection port 2A and is stored in the storage box 6. Therefore, substances such as particulates having a small mass in the exhaust g flow into the SiC filter 3 without being collected by the collection ring 5 and are collected by the SiC filter 3. On the other hand, many large metal powders and metal pieces in the exhaust g are collected by the collection ring 5 and do not flow into the SiC filter 3 but accumulate in the storage box 6.

When the regeneration process of the SiC filter 3 is started, the fuel f and the auxiliary air a are supplied to the burner 4, ignited by the ignition electrode 4B, and the temperature of the exhaust g passing through the exhaust pipe 1 is raised. Depending on the burner 4, e.g.
When the exhaust g heated to 00 ° C. is introduced into the SiC filter 3, the temperature inside the SiC filter 3 becomes high due to the heat of the exhaust g, and substances such as particulates trapped in the SiC filter 3 are burned and removed. You. At this time, since non-flammable substances such as metals are hardly collected in the SiC filter 3,
By the above-mentioned regeneration processing, the trapped substances of the SiC filter 3 are surely removed. The metal stored in the storage box 6 is
The screw 6E and the lid 6D are periodically removed from the box-shaped member 6A, and are discharged to the outside of the storage box 6 from the stored material discharge port 6B.

During the regeneration process, the metal in the exhaust gas g as in the state where the regeneration process is not performed.
It is not collected by the collection ring 5 and flows into the SiC filter 3. As mentioned above, many metals in the exhaust g
The amount of the metal flowing into the SiC filter 3 can be reduced by collecting by the collecting ring 5 and storing it in the storage box 6. Therefore, during the regeneration process of the SiC filter 3, it is possible to prevent the unburned and deposited metal in the filter,
Substances such as particulates trapped in the filter by the regeneration process can be reliably burned and removed. Therefore, the number of times of cleaning and replacing the SiC filter 3 is reduced, so that maintainability is improved and the life of the SiC filter 3 can be extended.

An opening 6B is formed in a part of the upper surface of the storage box 6.
That is, since the opening area of the opening 6B is made smaller than the area of the horizontal section of the storage box 6, even if the flow of the exhaust g in the storage box 6 is disturbed, the stored substance flows backward and the SiC filter 3 can be prevented from flowing. further,
A storage material outlet 6C is provided in the storage box 6, and the storage material outlet 6C is provided.
Since the lid 6D is detachably fixed with the screw 6E, the metal accumulated in the storage box 6 can be easily and periodically discharged.

The fixed position of the collecting ring 5 is not limited to the inner wall of the filter case 2 upstream of the SiC filter 3.
It is fixed to the inner wall or the like of the exhaust pipe 1 on the upstream side of the SiC filter 3, for example, on the upstream side of the filter case 2, and the position of the collection port is changed according to the fixing position of the collection ring 5. It is also applicable to move to a position close to the fixed part on the upstream side of the fixed part.

Further, without providing the storage container 6 with the storage material discharge port 6C, the method of fixing the filter case 2 and the storage box 6 is removably fixed using, for example, screws or the like. When discharging the waste metal, the storage box 6 is placed in the filter case 2
It is also possible to remove it from.

[0018]

As described above, according to the first aspect of the present invention, a large amount of metal contained in the exhaust gas is collected by the collecting means and stored in the storing means. The amount of metal flowing into the trap filter can be reduced. Therefore, during the regeneration process of the trap filter, it is possible to prevent metals from burning and accumulating in the filter, and to reliably burn and remove substances such as particulates trapped in the filter by the regeneration process. The number of times of cleaning and replacing the filter is reduced, so that the maintainability of the trap filter and the life thereof can be extended.

According to a second aspect of the present invention, in addition to the effect of the first aspect, the opening area of the opening of the storage means is made smaller than the area of the horizontal section of the box-shaped member. Even if the flow of exhaust gas in the storage means is disturbed, it is possible to prevent the stored material from flowing backward and flowing into the trap filter. According to a third aspect of the present invention, in addition to the effects of the first or second aspect, the box-shaped member of the storage means includes a storage material discharge port and a lid detachable from the storage material discharge port. With this arrangement, it is possible to easily discharge the stored matter stored in the storage means.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an embodiment of the present invention.

FIG. 2 is a sectional view of the vicinity of the storage box according to the embodiment;

FIG. 3 is a sectional view taken along the line II in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Exhaust pipe 2 Filter case 2A Collection port 3 SiC filter 4 Burner 5 Collection ring 6 Storage box 6A Box-shaped member 6B Opening 6C Storage discharge port 6D Cover 6E Screw

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI B01D 50/00 501 B01D 50/00 501H

Claims (3)

(57) [Claims] An apparatus for preventing clogging of a trap filter, which is interposed in an exhaust passage and collects particulates contained in exhaust gas, prevents the trap filter from being clogged. Fuel in the passage
The baking device, one end of the cylindrical member is directed to the upstream side inside the exhaust passage upstream of the trap filter, and a gap is formed between the outer periphery of the one end and the inner wall of the upstream exhaust passage. Collecting means for fixing the outer periphery of the other end and the inner wall of the upstream side exhaust passage; and fixing the lowermost part of the upstream side exhaust passage upstream of the fixed portion of the collecting means. And a box-shaped member provided with an opening in the upper part, and the opening is communicated with the collection port and fixed to the outside of the upstream exhaust passage. the inner diameter of the the storing means seen including a tubular member of said collecting means, a central portion the exhaust passage
Having an outer diameter smaller than the outer diameter toward the upstream end.
A device for preventing clogging of a particulate trap filter, characterized in that the device has a shape in which the particle size gradually decreases . 2. The apparatus for preventing clogging of a particulate trap filter according to claim 1, wherein said storing means has an opening area of said opening smaller than an area of a horizontal cross section of said box-shaped member. 3. The storage means according to claim 1, wherein said box-shaped member is provided with a storage material discharge port, and a detachably fixed lid is attached to said storage material discharge port.
A device for preventing clogging of a particulate trap filter as described in the above.