JPH0121127Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field> The present invention relates to an exhaust particulate filter for an internal combustion engine.

<Prior Art> Exhaust gas emitted from internal combustion engines, particularly diesel engines, such as automobiles, contains exhaust particulates whose main component is carbon. Therefore, from the viewpoint of preventing environmental pollution, a method for collecting the exhaust particulates has been developed. Various proposals have been made (Japanese Unexamined Patent Publications No. 12029/1983,
-115809). As a conventional example of this type, there is a filter that collects exhaust particulates, and an example of this is shown in FIGS. 1 and 2.

That is, the exhaust particulate filter 1 is formed with honeycomb-shaped partition walls 2 made of a porous material.
A large number of cells 3 are formed by these partition walls 2 substantially parallel to the flow direction of the exhaust gas. In addition, the ends of each cell 3 adjacent to each other with the partition wall 2 interposed therebetween are located on the exhaust introduction side (the first
(left side in the figure) and the exhaust outlet side are alternately sealed with sealing materials 4. This exhaust particulate filter 1 is housed in a case 8 via a wire mesh supporter 5, a wire mesh washer 6, and a sealing material 7, and is interposed together with the case 8 in an exhaust passage of an engine.

Then, the exhaust gas is caused to flow from the cell 3 into the adjacent cell 3 through the partition wall 2, and the partition wall 2 traps exhaust particulates. When a predetermined amount of exhaust particles are captured, the filter 1 is regenerated by heating and burning the exhaust particles using a burner (not shown) or a heater (not shown) to remove them.

However, in such a conventional exhaust particulate collection filter, since the exhaust particulate collection filter 1 is housed in the case 8, the filter 1
The outer periphery of was cooled by outside air. For this reason, if the exhaust particulates collected by the filter 1 are heated and burned with a burner, for example, the exhaust particulates in the center of the filter 1 can be burned and removed, but as you get closer to the outer periphery of the filter 1, the amount of remaining exhaust particulates increases. The problem was that there were many.
In order to solve this problem, it is conceivable to cover the outside of the filter 1 with a heat insulating member to keep the filter 1 warm, but this method has the problem of high cost. Furthermore, the uneven temperature distribution within the filter causes thermal distortion, which causes cracks and the like.

<Purpose of the invention> In view of the current situation, an object of the present invention is to provide an exhaust particulate collection filter that is low in cost and is capable of burning and removing exhaust particulates from the entire filter.

<Structure of the invention> For this reason, the present invention provides an exhaust particulate filter having a plurality of substantially parallel cells formed by honeycomb-like partition walls made of a porous material, in which both ends of each cell on the outer periphery are While the cell is sealed with a sealing material to serve as a heat-retaining space, the ends of adjacent cells in the center are alternately sealed with a sealing material, and the temperature inside the filter is approximately reduced by the heat-retaining space. The filter is held constant to improve filter regeneration and to prevent cracks from occurring.

<Example> An example of the present invention will be described below with reference to FIGS. 3 and 4.

In the figure, an exhaust particulate filter 11 installed in an exhaust passage of an engine is formed of honeycomb-shaped partition walls 12 made of a porous material, and these partition walls 12 form a large number of cells 13 approximately parallel to the exhaust flow direction. It is formed. The openings at both ends of the cell 13 on the outer periphery of the exhaust particulate collection filter 11 are covered with a sealing material 14.
Each cell is sealed by
3 forms a heat-retaining space A that keeps the central portion warm. Further, in the center of the filter 11, the openings of the cells 13 and the openings of adjacent cells 13 are alternately sealed with sealing members 14 on the exhaust gas introduction side and the exhaust gas discharge side.

According to this configuration, the exhaust gas flowing into the cell 13 at the center of the exhaust particulate collection filter 11 flows into the adjacent cell 13 via the partition wall 12, and the particulates in the exhaust gas are collected by the partition wall 12. Also,
Since the heat-retaining space A is formed on the outer periphery of the filter 11, the outside air and the center are separated by the heat-retaining space A, and the heat-retaining space A is heated by the exhaust gas flowing through the center and maintained at a high temperature, so that the exhaust gas is not exhausted. The central part that collects fine particles is not cooled by the outside air. Therefore, the central portion of the filter 11 is maintained at a high temperature and its temperature distribution is made substantially uniform, so that no thermal strain occurs in the central portion of the filter 11, preventing the occurrence of cracks and the like. During regeneration, exhaust particulates can be heated and burned over the entire area using a burner or the like. Furthermore, since the structure is extremely simple in that both end openings of the cells on the outer periphery of the filter 11 are sealed with the sealing material 14, an increase in the cost of the filter 11 can also be suppressed.

<Effects of the invention> As explained above, in the present invention, the openings at both ends of the cells on the outer periphery of the filter are sealed with a sealing material, and the cells form a heat-retaining space that keeps the central part warm. Since the central part of the filter is isolated from the outside air and kept at a high temperature, the central part of the filter is maintained at a high temperature and its temperature distribution is made substantially uniform. This prevents the generation of cracks and the like without generating thermal strain in the central part where exhaust particulates are collected, and allows the exhaust particulates collected in the central part of the filter to be combusted over the entire area. Further, since the structure is extremely simple in that the openings at both ends of the cells on the outer periphery of the filter are sealed with a sealing material, an increase in cost can also be suppressed.

[Brief explanation of drawings]

FIG. 1 is a side view showing a conventional example of an exhaust particulate filter, FIG. 2 is a view taken in the direction of the arrow in FIG. 1, FIG. 3 is a side view showing an embodiment of the present invention, and FIG. FIG. 11... Exhaust particulate collection filter, 12... Partition wall,
13...Cell, 14...Sealing material, A...Heat insulation space.

Claims (1)

[Scope of utility model registration request] Existing on the outer periphery of an exhaust particulate filter for an internal combustion engine, in which a plurality of substantially parallel cells are formed by honeycomb-like partition walls made of a porous material, and exhaust gas flows from one cell to an adjacent cell through the partition walls. An internal combustion engine characterized in that both ends of each cell are sealed with a sealing material to make the cell a heat-retaining space, and the ends of adjacent cells in the center are alternately sealed with a sealing material. Exhaust particulate filter.