WO2016158420A1

WO2016158420A1 - Honeycomb filter

Info

Publication number: WO2016158420A1
Application number: PCT/JP2016/058336
Authority: WO
Inventors: 優次永田; 大西　哲雄; 悠太櫻井; 悠二宮
Original assignee: 株式会社小松製作所
Priority date: 2015-03-31
Filing date: 2016-03-16
Publication date: 2016-10-06

Abstract

This honeycomb filter (1) is provided with a filter main body (2), multiple inlet cells (3), and multiple outlet cells (4). The multiple inlet cells (3) and the multiple outlet cells (4) are arranged in a matrix having at least twelve rows and twelve columns. Each of the multiple inlet cells (3) is adjacent to at least one of the outlet cells (4) with a partition wall (9) interposed therebetween. An opening area ratio (A1/B1) of the total opening area (A1) of the multiple inlet cells (3) in a first end surface (5) to the total opening area (B1) of the multiple outlet cells (4) in a second end surface (6) is greater than 1.0.

Description

Honeycomb filter

The present invention relates to a honeycomb filter.

A honeycomb filter for collecting PM (particulate matter) in exhaust gas discharged from an internal combustion engine of a construction machine or a vehicle is known. PM includes soot (carbon soot) and ash (ash). The soot can be removed by burning the honeycomb filter at a high temperature. Ash is the unburned residue of metallic additives contained in engine oil and the like, and cannot be removed by combustion even when the honeycomb filter is at a high temperature. When the honeycomb filter is clogged with ash, it is necessary to blow out the ash by sending compressed air after removing the honeycomb filter.

Conventionally, various methods have been proposed to suppress an increase in pressure loss of the honeycomb filter during soot deposition. For example, Patent Document 1 proposes a method of adjusting the ratio of the total surface area of the partition walls between the inlet cells to the total surface area of the partition walls of all cells.

JP 2007-154870 A

However, an effective method for suppressing an increase in the pressure loss of the honeycomb filter during ash deposition has not been proposed yet.

The present invention has been made in view of the above-described problems, and an object thereof is to provide a honeycomb filter capable of suppressing an increase in pressure loss during ash deposition.

The honeycomb filter according to the first aspect includes a filter body, a plurality of inlet cells, and a plurality of outlet cells. The filter body has a first end surface and a second end surface. Each of the plurality of inlet cells opens at the first end face and closes at the second end face. Each of the plurality of outlet cells is closed at the first end face and opened at the second end face. The plurality of inlet cells and the plurality of outlet cells are arranged in a matrix of 12 rows and 12 columns or more. Each of the plurality of inlet cells is adjacent to at least one outlet cell included in the plurality of outlet cells via a partition wall. The ratio of the opening area of the total opening area of the plurality of inlet cells in the first end face to the total opening area of the plurality of outlet cells in the second end face is greater than 1.0.

The honeycomb filter according to the first aspect can suppress an increase in pressure loss of the honeycomb filter during ash deposition.

The honeycomb filter according to the second aspect relates to the first aspect, and the opening area ratio is smaller than 3.0.

The honeycomb filter according to the second aspect can further suppress an increase in pressure loss of the honeycomb filter during ash deposition.

The honeycomb filter according to the third aspect relates to the first or second aspect, and the plurality of inlet cells include inlet cells arranged continuously in all rows.

According to the honeycomb filter according to the third aspect, when visually confirming that the plurality of outlet sealing portions and the plurality of inlet sealing portions are formed at appropriate positions in the filter body, all the rows are the inlet cells. It can be visually checked by dividing each column.

The honeycomb filter according to the fourth aspect relates to any one of the first to third aspects, and the plurality of inlet cells and the plurality of outlet cells are arranged in a repeating pattern of a basic matrix of 2 rows and 3 columns.

According to the honeycomb filter according to the fourth aspect, the entire opening area ratio can be easily set by setting the opening area ratio in the basic matrix.

According to the present invention, it is possible to provide a honeycomb filter capable of suppressing an increase in pressure loss during ash deposition.

1 is a perspective view of a honeycomb filter according to a first embodiment. AA sectional view of FIG. Plan view of the first end face Plan view of the second end face The top view of the 1st end surface of the honey-comb filter which concerns on 2nd Embodiment. The top view of the 2nd end face of the honeycomb filter concerning a 2nd embodiment. Schematic diagram showing other arrangement patterns of inlet cells and outlet cells Schematic diagram showing other arrangement patterns of inlet cells and outlet cells Sample No. Schematic diagram showing the arrangement pattern of the inlet cells and outlet cells in 1 Sample No. Schematic diagram showing the arrangement pattern of inlet cells and outlet cells in FIG. Sample No. A graph showing the relationship between the opening area ratio of 1 to 7 and the pressure loss (2.0 g / L) Sample No. Graph showing the relationship between the opening area ratio of 1 to 7 and the pressure loss (煤 4.0 g / L) Sample No. A graph showing the relationship between the opening area ratio of 1 to 7 and the pressure loss (煤 8.0 g / L) Sample No. A graph showing the relationship between the amount of accumulated

ash

1 and 3 to 7 and the pressure loss (煤 4.0 g / L) Sample No. A graph showing the relationship between the amount of accumulated

ash

1 and 3 to 7 and the pressure loss (煤 5.0 g / L) Sample No. A graph showing the relationship between the amount of accumulated

ash

1 and 3 to 7 and the pressure loss (煤 8.0 g / L)

1. First Embodiment (Configuration of Honeycomb Filter)
FIG. 1 is a perspective view of a honeycomb filter 1 according to the first embodiment. FIG. 2 is a cross-sectional view taken along the line AA in FIG. FIG. 3 is a plan view of the first end face 5. FIG. 4 is a plan view of the second end face 6.

As shown in FIG. 1, the honeycomb filter 1 includes a filter body 2, a plurality of inlet cells 3, and a plurality of outlet cells 4.

The filter body 2 has a first end surface 5, a second end surface 6, and a side surface 7. The first end surface 5 is provided on the opposite side of the second end surface 6. Exhaust gas discharged from an internal combustion engine of a construction machine or a vehicle flows in from the first end surface 5 and flows out from the second end surface 6. The side surface 7 continues to the outer edge of the first end surface 5 and the outer edge of the second end surface 6. The filter body 2 is formed in a columnar shape, but may be formed in a polygonal column shape or an elliptical column shape.

The filter body 2 is made of a porous material. As the porous material, use a material that is a combination of one or more of silicon carbide, cordierite, mullite, alumina, spinel, silicon nitride, lithium aluminum silicate, aluminum titanate, and Fe-Cr-Al-based metals. However, it is not limited to this.

As shown in FIG. 2, the end portion on the second end face 6 side of the inlet cell 3 is sealed by the outlet sealing portion 10. The inlet cell 3 opens to the first end face 5 and closes to the second end face 6. The end portion on the first end face 5 side of the outlet cell 4 is sealed by the inlet sealing portion 11. The outlet cell 4 is closed at the first end face 5 and is open at the second end face 6.

The exhaust gas flowing into the inlet cell 3 flows out from the outlet cell 4 after passing through the partition wall 9. The partition wall 9 functions as a filter that collects PM (particulate matter) contained in the exhaust gas. PM contains soot and ash (ash). The soot is a substance that can be removed by combustion by raising the temperature of the honeycomb filter 1 (that is, a substance that can be removed by combustion). Ashes are unburned residues of metallic additives (for example, Ca and Zn) contained in engine oil and the like, and are substances that cannot be removed by combustion even when the honeycomb filter 1 is heated to a high temperature (that is, substances that cannot be removed by combustion). When the honey-comb filter 1 is clogged with ash, after removing the honey-comb filter 1, it is necessary to blow in ash by sending compressed air from the 2nd end surface 6 side.

The sectional shape of each of the inlet cell 3 and the outlet cell 4 is a square, but may be a rectangle or an ellipse. The cross-sectional shape of the inlet cell 3 may be different from the cross-sectional shape of the outlet cell 4. In the first embodiment, the cross-sectional area of the inlet cell 3 and the cross-sectional area of the outlet cell 4 are the same, but may be different from each other.

The filter body 2 includes an outer wall 8, a partition wall 9, a plurality of outlet sealing portions 10, and a plurality of inlet sealing portions 11. The outer wall 8 is formed in a cylindrical shape. The partition wall 9 is disposed inside the outer wall 8. The partition walls 9 are formed in a lattice shape. The space inside the partition wall 9 and the space between the partition wall 9 and the outer wall 8 are a plurality of inlet cells 3 and a plurality of outlet cells 4.

3 and 4, the plurality of inlet cells 3 and the plurality of outlet cells 4 are arranged in a matrix. The honeycomb filter 1 has a plurality of inlet cells 3 and a plurality of outlet cells 4 arranged in a matrix of 12 rows and 12 columns or more. The honeycomb filter 1 only needs to have a matrix of at least 12 rows and 12 columns, and the number of rows and the number of columns can be set independently.

Each of the plurality of inlet cells 3 is adjacent to at least one outlet cell 4 via a partition wall 9. In the present embodiment, “adjacent” means adjacent to each other in the row direction and the column direction so as to sandwich the plate-like portion of the partition wall 9, and an oblique direction intersecting the row direction and the column direction. It is a concept that does not include adjoining. Accordingly, the outlet cells 4 are arranged on either the row direction both sides and the column direction both sides of each inlet cell 3. The inlet cell 3 only needs to be adjacent to one or more outlet cells 4, and the number of the outlet cells 4 adjacent to the inlet cell 3 may be different for each inlet cell 3.

When the total opening area of the plurality of inlet cells 3 on the first end face 5 is A1, and the total opening area of the plurality of outlet cells 4 on the second end face 6 is B1, the opening area of the total opening area A1 with respect to the total opening area B1 The ratio (A1 / B1) is greater than 1.0. The opening area ratio (A1 / B1) is preferably smaller than 3.0, and more preferably 2.0. The total opening area A1 is obtained by adding the opening areas of all the inlet cells 3 in the first end face 5. The total opening area B1 is obtained by adding the opening areas of all the outlet cells 4 in the second end face 6.

3 and 4, the plurality of inlet cells 3 and the plurality of outlet cells 4 are arranged in a repeating pattern of a basic matrix M1 of 2 rows and 3 columns. The arrangement of the plurality of inlet cells 3 and the plurality of outlet cells 4 is designed by repeating a basic matrix M1 of 2 rows and 3 columns. The basic matrix M1 is repeated so that each of the plurality of inlet cells 3 is adjacent to at least one outlet cell 4.

The basic matrix M1 includes four inlet cells 3 and two outlet cells 4. The basic matrix M1 has a configuration in which a row in which one outlet cell 4 is arranged between two inlet cells 3 and a row in which one outlet cell 4 is arranged next to the two inlet cells 3 are connected. is there.

In the basic matrix M1, when the total opening area of the four inlet cells 3 in the first end face 5 is A2 and the total opening area of the two outlet cells 4 in the second end face 6 is B2, the total with respect to the total opening area B2 The opening area ratio (A2 / B2) of the opening area A2 is 2.0. Since the plurality of inlet cells 3 and the plurality of outlet cells 4 are arranged in a repeating pattern of the basic matrix M1, the above-described opening area ratio (A1 / B1) is 2.0.

As shown in FIGS. 3 and 4, the plurality of inlet cells 3 include the inlet cells 3 arranged continuously in all rows. In the first embodiment, the columns in which all the rows are the entrance cells 3 are regularly arranged every three columns. The number and position of the columns in which all the rows are the entrance cells 3 can be appropriately changed.

(Characteristic)
(1) The honeycomb filter 1 according to the first embodiment includes a plurality of inlet cells 3 and a plurality of outlet cells 4 arranged in a matrix of 12 rows and 12 columns or more. Each of the plurality of inlet cells 3 is adjacent to at least one outlet cell via the partition wall 9. The opening area ratio (A1 / B1) of the total opening area A1 of the plurality of inlet cells 3 in the first end face 5 to the total opening area B1 of the plurality of outlet cells 4 in the second end face 6 is larger than 1.0. With such a configuration, an increase in pressure loss of the honeycomb filter 1 during ash deposition can be suppressed. This effect becomes more prominent when the opening area ratio (A1 / B1) is smaller than 3.0.

(2) The plurality of inlet cells 3 include the inlet cells 3 arranged continuously in all rows. When visually confirming that the plurality of outlet sealing portions 10 and the plurality of inlet sealing portions 11 are formed at appropriate positions in the filter body 2, all the rows are divided into columns each having the inlet cells 3. And can be easily visually confirmed.

(3) The plurality of inlet cells 3 and the plurality of outlet cells 4 are arranged in a repeating pattern of the basic matrix M1. By setting the opening area ratio (A2 / B2) in the basic matrix M1, the entire opening area ratio (A1 / B1) can be easily set.
2. Second Embodiment A honeycomb filter 21 according to a second embodiment will be described with reference to the drawings. FIG. 5 is a plan view of the first end face 5. FIG. 6 is a plan view of the second end face 6.

The basic configuration of the honeycomb filter 21 according to the second embodiment is the same as that of the honeycomb filter 1 according to the first embodiment. The difference between the honeycomb filter 21 according to the second embodiment and the honeycomb filter 1 according to the first embodiment is the arrangement of the plurality of inlet cells 3 and the plurality of outlet cells 4 and the opening area ratio thereof. In the following, the difference will be mainly described.

When the total opening area of the plurality of inlet cells 3 on the first end face 5 is A1, and the total opening area of the plurality of outlet cells 4 on the second end face 6 is B1, the opening area of the total opening area A1 with respect to the total opening area B1 The ratio (A1 / B1) is greater than 1.0. Thereby, an increase in pressure loss of the honeycomb filter 21 at the time of ash deposition can be suppressed as compared with the case where the opening area ratio is 1.0.

In the second embodiment, the ratio of the opening area of the total opening area A1 to the total opening area B1 is preferably 2.0 or more and 4.0 or less. As a result, the increase in pressure loss with respect to the increase in ash deposition amount can be suppressed.

5 and 6, the plurality of inlet cells 3 and the plurality of outlet cells 4 are arranged in a repeating pattern of a basic matrix M10 of 2 rows and 5 columns. The basic matrix M10 includes eight inlet cells 3 and two outlet cells 4. The basic matrix M10 includes a row in which one outlet cell 4 is arranged between three inlet cells 3 and one inlet cell 3, and one outlet cell 4 between one inlet cell 3 and three inlet cells 3. This is a configuration in which a row in which is placed is connected.

The arrangement of the plurality of inlet cells 3 and the plurality of outlet cells 4 is designed by repeating a basic matrix M10 of 2 rows and 5 columns. The basic matrix M10 is repeated so that each of the plurality of inlet cells 3 is adjacent to at least one outlet cell 4.

In the basic matrix M10, when the total opening area of the eight inlet cells 3 in the first end face 5 is A2, and the total opening area of the two outlet cells 4 in the second end face 6 is B2, the total with respect to the total opening area B2 The opening area ratio (A2 / B2) of the opening area A2 is 4.0. Therefore, the opening area ratio (A1 / B1) of the plurality of inlet cells 3 and the plurality of outlet cells 4 arranged in the repeating pattern of the basic matrix M1 is also 4.0.

(Characteristic)
The honeycomb filter 21 according to the second embodiment includes a plurality of inlet cells 3 and a plurality of outlet cells 4 arranged in a matrix of 12 rows and 12 columns or more. Each of the plurality of inlet cells 3 is adjacent to at least one outlet cell via the partition wall 9. The opening area ratio (A1 / B1) of the total opening area A1 of the plurality of inlet cells 3 in the first end face 5 to the total opening area B1 of the plurality of outlet cells 4 in the second end face 6 is larger than 1.0. This can suppress an increase in pressure loss of the honeycomb filter 1 during ash deposition.

In the honeycomb filter 21 according to the second embodiment, the opening area ratio (A1 / B1) is 2.0 or more and 4.0 or less. As a result, the increase in the pressure loss with respect to the increase in the ash deposition amount can be suppressed, so that the pressure loss value is a predetermined upper limit value compared to the case where the opening area ratio is 1.0 or more and less than 2.0. The ash capacity that can be deposited before reaching this value can be increased. As a result, the maintenance period of the honeycomb filter 21 can be extended.

(Other embodiments)
In the above embodiment, the plurality of inlet cells 3 and the plurality of outlet cells 4 are arranged in a repeating pattern of the basic matrix M1 of 2 rows and 3 columns, but the present invention is not limited to this. The plurality of inlet cells 3 and the plurality of outlet cells 4 may be arranged in a basic matrix repeating pattern of 2 rows and 3 columns or more.

For example, as shown in FIGS. 7A to 7F, a plurality of inlet cells 3 and a plurality of outlet cells 4 can be arranged. In FIG. 7A, the basic matrix M2 is arranged in a repeating pattern of 2 rows and 5 columns, and the aperture area ratio (A2 / B2) in the basic matrix M2 is 1.5. The basic matrix M2 is repeated so that every inlet cell 3 is adjacent to at least one outlet cell 4. In FIG. 7B, the basic matrix M3 is arranged in a repeating pattern of 2 rows and 12 columns, and the aperture area ratio (A2 / B2) in the basic matrix M3 is 1.67. The basic matrix M3 is repeated so that every inlet cell 3 is adjacent to at least one outlet cell 4. In FIG. 7C, the basic matrix M4 is arranged in a repeating pattern of 12 rows and 6 columns, and the aperture area ratio (A2 / B2) in the basic matrix M4 is 1.88. The basic matrix M4 is repeated so that every inlet cell 3 is adjacent to at least one outlet cell 4. In FIG. 7D, the basic matrix M5 is arranged in a repeating pattern of 2 rows and 3 columns, and the aperture area ratio (A2 / B2) in the basic matrix M5 is 2.0. The basic matrix M5 is repeated so that every inlet cell 3 is adjacent to at least one outlet cell 4. In FIG.7 (e), it arranges with the repeating pattern of the basic matrix M6 of 4 rows 2 columns, and the opening area ratio (A2 / B2) in the basic matrix M6 is 3.0. The basic matrix M6 is repeated so that every inlet cell 3 is adjacent to at least one outlet cell 4. In FIG. 7F, the basic matrix M6 'is arranged in a repeating pattern of 4 rows and 2 columns, and the aperture area ratio (A2 / B2) in the basic matrix M6' is 3.0. The basic matrix M <b> 6 ′ is repeated so that every inlet cell 3 is adjacent to at least one outlet cell 4.

In the above embodiment, the plurality of inlet cells 3 include the inlet cells 3 arranged continuously in all rows, but the present invention is not limited to this. The entrance cells 3 may not be arranged continuously in all rows.

For example, as shown in FIGS. 8A and 8B, a plurality of inlet cells 3 and a plurality of outlet cells 4 can be arranged. In FIG. 8A, the basic matrix M7 is arranged in a repeating pattern of 2 rows and 5 columns, and the aperture area ratio (A2 / B2) in the basic matrix M7 is 1.5. The basic matrix M7 is repeated so that every inlet cell 3 is adjacent to at least one outlet cell 4. In FIG. 8B, the basic matrix M8 is arranged in a repeating pattern of 2 rows and 3 columns, and the aperture area ratio (A2 / B2) in the basic matrix M8 is 2.0. The basic matrix M8 is repeated so that every inlet cell 3 is adjacent to at least one outlet cell 4.

Hereinafter, examples of the present invention will be described. However, the present invention is not limited to the examples described below.

(Production of sample Nos. 1 to 7)
First, a filter body in which approximately 7200 through holes were formed was prepared. The cross-sectional shape of the through hole was a square, and the cross-sectional size of the through hole was 1200 μm × 1200 μm. The partition wall thickness was 300 μm.

Next, an outlet sealing portion and an inlet sealing portion were formed in a predetermined pattern.

Sample No. In FIG. 1, as shown in FIG. 9, the outlet sealing portion and the inlet sealing portion were formed so that the inlet cells and the outlet cells were alternately and regularly arranged. Sample No. The opening area ratio (A1 / B1) at 1 is 1.0.

Sample No. In FIG. 2, the outlet sealing portion and the inlet sealing portion are formed so that the inlet cells and the outlet cells are arranged in a repeating pattern of a basic matrix M9 of 4 rows and 4 columns, as shown in FIG. The basic matrix M9 is formed with a closed inlet cell surrounded on four sides by inlet cells. The exhaust gas flowing into the closed inlet cell passes through the partition wall and flows again into the adjacent inlet cell. Since exhaust gas cannot be efficiently guided from the closed inlet cell to the outlet cell, the pressure loss tends to increase. Since the closed entrance cell exists in the basic matrix M9, the closed entrance cell cannot be eliminated no matter how the basic matrix M9 is repeated. Sample No. The opening area ratio (A1 / B1) at 2 is 1.67.

Sample No. 3, as illustrated in FIG. 8A, the outlet sealing portion and the inlet sealing portion are formed so that the inlet cells and the outlet cells are arranged in a repeating pattern of the basic matrix M7. Sample No. The opening area ratio (A1 / B1) at 3 is 1.5. Sample No. 3 does not include entrance cells arranged continuously in all rows.

Sample No. 4, the outlet sealing portion and the inlet sealing portion were formed so that the inlet cells and the outlet cells were arranged in a repeating pattern of the basic matrix M1, as shown in FIG. Sample No. The opening area ratio (A1 / B1) at 4 is 2.0. Sample No. 4 includes entrance cells arranged continuously in all rows.

Sample No. 5, as illustrated in FIG. 7E, the outlet sealing portion and the inlet sealing portion are formed so that the inlet cells and the outlet cells are arranged in a repeating pattern of the basic matrix M6. Sample No. The opening area ratio (A1 / B1) at 5 is 3.0. Sample No. 5 includes entrance cells arranged continuously in all rows.

Sample No. 6, as illustrated in FIGS. 5 and 6, the outlet sealing portion and the inlet sealing portion are formed so that the inlet cells and the outlet cells are arranged in a repeating pattern of the basic matrix M <b> 10. Sample No. The opening area ratio (A1 / B1) at 6 is 4.0. Sample No. 6 does not include entrance cells arranged continuously in all rows.

Sample No. 7, as illustrated in FIG. 8B, the outlet sealing portion and the inlet sealing portion are formed so that the inlet cells and the outlet cells are arranged in a repeating pattern of the basic matrix M8. Sample No. The opening area ratio (A1 / B1) at 7 is 2.0. Sample No. 7 does not include entrance cells arranged continuously in all rows.

(Measurement of pressure loss)
Each sample was placed in the exhaust passage of the engine, and the engine was operated at a rotation speed of 1100 rpm and a load of 180 ± 10 Nm.

When a predetermined amount of soot and a predetermined amount of ash were deposited, the pressure difference between the inlet side and the outlet side of each sample was measured as a pressure loss.

11 to 13 show sample numbers. 7 is a graph showing a relationship between an opening area ratio of 1 to 7 and pressure loss. In each graph, the lower broken line is a value when ash is deposited at 22.5 g / L, and the upper broken line is a value when ash is deposited at 45.0 g / L. In FIG. 11, soot is deposited at 2.0 g / L, in FIG. 12, soot is deposited at 4.0 g / L, and in FIG. 13, soot is deposited at 8.0 g / L.

As shown in FIG. 11 to FIG. 13, the sample No. with an opening area ratio larger than 1.0 and no closed inlet cell is present. In Nos. 3 to 6, sample Nos. With an opening area ratio of 1.0. 1 and the sample No. in which the closed inlet cell exists. Compared to 2, it was possible to suppress an increase in pressure loss during ash deposition. This effect was more remarkable as the ash deposition amount and / or soot deposition amount increased.

Sample No. with an opening area ratio smaller than 3.0. In Nos. 3 and 4, Sample No. with an opening area ratio of 3.0 was used. Compared with 5, it was possible to further suppress an increase in pressure loss during ash deposition.

14 to 16 show sample numbers. 7 is a graph showing the relationship between the amount of accumulated

ash

1 and 3 to 7 and the pressure loss. In FIG. 14, soot has accumulated 4.0 g / L, in FIG. 15 soot has accumulated 5.0 g / L, and in FIG. 16, soot has accumulated 8.0 g / L.

As shown in FIG. 14 to FIG. 16, the sample area No. in which the opening area ratio is 2.0 or more and 4.0 or less and no closed inlet cell is present. In Samples 4 to 7, sample Nos. With an opening area ratio of 1.0. 1 and sample No. 1 with an opening area ratio of 1.5. Compared to 3, it was possible to suppress the increase in the pressure loss with respect to the increase in the ash deposition amount until 45 g / L of ash was deposited.

And sample no. 5 (opening area ratio: 3.0), the amount of ash deposited was increased to 70 g / L. The pressure loss of Sample No. 5 with 45 g / L of ash deposited. 1 pressure loss. From this, it was found that by setting the opening area ratio to 2.0 or more and 4.0 or less, the ash capacity that can be deposited before the pressure loss value reaches a predetermined upper limit value can be increased.

DESCRIPTION OF SYMBOLS 1 Honeycomb filter 2 Filter main body 3 Inlet cell 4 Outlet cell 5 1st end surface 6 2nd end surface 7 Side 8 Outer wall 9 Partition 10 Outlet sealing part 11 Inlet sealing part M1-M10 Basic matrix

Claims

A filter body having a first end face and a second end face;
A plurality of inlet cells each opening at the first end face and closing at the second end face;
A plurality of outlet cells each closed at the first end surface and opened at the second end surface;
With
The plurality of inlet cells and the plurality of outlet cells are arranged in a matrix of 12 rows and 12 columns or more,
Each of the plurality of inlet cells is adjacent to at least one outlet cell included in the plurality of outlet cells via a partition;
The ratio of the opening area of the total opening area of the plurality of inlet cells in the first end face to the total opening area of the plurality of outlet cells in the second end face is greater than 1.0,
Honeycomb filter.
The opening area ratio is less than 3.0,
The honeycomb filter according to claim 1.
The opening area ratio is 2.0 or more and 4.0 or less,
The honeycomb filter according to claim 1.
The plurality of inlet cells include inlet cells arranged continuously in all rows,
The honeycomb filter according to any one of claims 1 to 3.
The plurality of inlet cells and the plurality of outlet cells are arranged in a repeating pattern of a basic matrix of 2 rows and 3 columns,
The honeycomb filter according to any one of claims 1 to 4.