A honeycomb filter includes a plurality of honeycomb fired bodies. Each of the plurality of honeycomb fired bodies includes an outer wall, a plurality of cells, and porous cell walls. The plurality of cells include exhaust gas introduction cells each having an open end at an exhaust gas inlet side a
A honeycomb filter includes a plurality of honeycomb fired bodies. Each of the plurality of honeycomb fired bodies includes an outer wall, a plurality of cells, and porous cell walls. The plurality of cells include exhaust gas introduction cells each having an open end at an exhaust gas inlet side and a plugged end at an exhaust gas outlet side and exhaust gas emission cells each having an open end at the exhaust gas outlet side and a plugged end at the exhaust gas inlet side. Sub-cells adjacent to the outer wall include exhaust gas introduction sub-cells among the exhaust gas introduction cells and exhaust gas emission sub-cells among the exhaust gas emission cells. A total volume of the exhaust gas emission sub-cells adjacent to the outer wall is greater than a total volume of the exhaust gas introduction sub-cells adjacent to the outer wall.
대표청구항▼
1. A honeycomb filter comprising: a plurality of honeycomb fired bodies combined with one another via adhesive layers between the plurality of honeycomb fired bodies, each of the plurality of honeycomb fired bodies comprising: an outer wall provided on an outer periphery of each of the plurality of
1. A honeycomb filter comprising: a plurality of honeycomb fired bodies combined with one another via adhesive layers between the plurality of honeycomb fired bodies, each of the plurality of honeycomb fired bodies comprising: an outer wall provided on an outer periphery of each of the plurality of honeycomb fired bodies;a plurality of cells; andporous cell walls defining the plurality of cells, the plurality of cells including exhaust gas introduction cells each having an open end at an exhaust gas inlet side and a plugged end at an exhaust gas outlet side and exhaust gas emission cells each having an open end at the exhaust gas outlet side and a plugged end at the exhaust gas inlet side, the exhaust gas introduction cells and the exhaust gas emission cells each having a uniform cross-sectional shape throughout from an end at the exhaust gas inlet side to an end at the exhaust gas outlet side except for a plugged portion in a cross section perpendicular to a longitudinal direction of the plurality of cells, each of the exhaust gas emission cells being adjacently surrounded fully by the exhaust gas introduction cells across the porous cell walls except for sub-cells adjacent to the outer wall among the plurality of cells, the sub-cells adjacent to the outer wall comprising exhaust gas introduction sub-cells among the exhaust gas introduction cells and exhaust gas emission sub-cells among the exhaust gas emission cells, a total volume of the exhaust gas emission sub-cells adjacent to the outer wall being greater than a total volume of the exhaust gas introduction sub-cells adjacent to the outer wall. 2. The honeycomb filter according to claim 1, wherein the sub-cells adjacent to the outer wall comprise the exhaust gas introduction sub-cells and the exhaust gas emission sub-cells alternately arranged with the exhaust gas introduction sub-cells, andwherein a cross-sectional area of each of the exhaust gas emission sub-cells in the cross section perpendicular to the longitudinal direction of the plurality of cells is larger than a cross-sectional area of each of the exhaust gas introduction sub-cells in the cross section perpendicular to the longitudinal direction of the plurality of cells. 3. The honeycomb filter according to claim 1, wherein the exhaust gas introduction cells include first exhaust gas introduction cells and second exhaust gas introduction cells having a larger cross-sectional area than the first exhaust gas introduction cells in the cross section perpendicular to the longitudinal direction of the plurality of cells,wherein a cross-sectional area of each of the exhaust gas emission cells in the cross section perpendicular to the longitudinal direction of the plurality of cells is equal to or larger than a cross-sectional area of each of the second exhaust gas introduction cells in the cross section perpendicular to the longitudinal direction of the plurality of cells,wherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, the exhaust gas introduction cells and the exhaust gas emission cells each have a polygonal shape, andwherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells,a side facing one of the exhaust gas emission cells among sides forming a cross-sectional shape of each of the first exhaust gas introduction cells is longer than a side facing one of the exhaust gas emission cells among sides forming a cross-sectional shape of each of the second exhaust gas introduction cells, orone of sides forming the cross-sectional shape of each of the first exhaust gas introduction cells faces one of the exhaust gas emission cells, and none of sides forming the cross-sectional shape of each of the second exhaust gas introduction cells faces the exhaust gas emission cells. 4. The honeycomb filter according to claim 3, wherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, the exhaust gas introduction cells and the exhaust gas emission cells each have the polygonal shape, andwherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, a side facing one of the exhaust gas emission cells among the sides forming the cross-sectional shape of each of the second exhaust gas introduction cells has a length that is not more than about 0.8 times a length of a side facing one of the exhaust gas emission cells among the sides forming the cross-sectional shape of each of the first exhaust gas introduction cells. 5. The honeycomb filter according to claim 3, wherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, the exhaust gas emission cells are octagonal, the first exhaust gas introduction cells are square, and the second exhaust gas introduction cells are octagonal. 6. The honeycomb filter according to claim 3, wherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, the cross-sectional area of each of the second exhaust gas introduction cells is equal to the cross-sectional area of each of the exhaust gas emission cells, andwherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, across-sectional area of each of the first exhaust gas introduction cells is about 20% to about 50% of the cross-sectional area of each of the second exhaust gas introduction cells. 7. The honeycomb filter according to claim 5, wherein the porous cell walls separating the plurality of cells of the honeycomb filter have a uniform thickness throughout the porous cell walls. 8. The honeycomb filter according to claim 5, wherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, the exhaust gas emission cells each have an octagonal cross section, the first exhaust gas introduction cells each have a square cross section, and the second exhaust gas introduction cells each have an octagonal cross section,wherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, the cross-sectional shape of each of the second exhaust gas introduction cells is congruent with a cross-sectional shape of each of the exhaust gas emission cells,wherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, the exhaust gas emission cells, the first exhaust gas introduction cells, and the second exhaust gas introduction cells are arranged in a manner that the exhaust gas emission cells are each surrounded by four first exhaust gas introduction cells among the first exhaust gas introduction cells and four second exhaust gas introduction cells among the second exhaust gas introduction cells, which are alternately arranged, across the porous cell walls,provided that hypothetical segments are drawn which connect a centroid of each octagonal cross section of the four second exhaust gas introduction cells surrounding a reference exhaust gas emission cell among the exhaust gas emission cells, then an intersection of two hypothetical segments among the hypothetical segments intersecting a shape region corresponding to the cross-sectional shape of the reference exhaust gas emission cell coincides with a centroid of the octagonal cross section of the reference exhaust gas emission cell, andfour hypothetical segments among the hypothetical segments that do not intersect the shape region corresponding to the cross-sectional shape of the reference exhaust gas emission cell form a square, and a midpoint of each side of the square coincides with a centroid of each square cross section of the four first exhaust gas introduction cells surrounding the reference exhaust gas emission cell,wherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, a side facing one of the first exhaust gas introduction cells across a first porous cell wall among the porous cell walls among sides forming the cross-sectional shape of one of the exhaust gas emission cells is parallel to aside facing the one of the exhaust gas emission cells across the first porous cell wall among sides forming the cross-sectional shape of the one of the first exhaust gas introduction cells,wherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, a side facing one of the second exhaust gas introduction cells across a second porous cell wall among the porous cell walls among sides forming the cross-sectional shape of one of the exhaust gas emission cells is parallel to a side facing the one of the exhaust gas emission cells across the second porous cell wall among sides forming the cross-sectional shape of the one of the second exhaust gas introduction cells,wherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, a side facing one of the second exhaust gas introduction cells across a third porous cell wall among the porous cell walls among sides forming the cross-sectional shape of one of the first exhaust gas introduction cells is parallel to a side facing the one of the first exhaust gas introduction cells across the third porous cell wall among sides forming the cross-sectional shape of the one of the second exhaust gas introduction cells, andwherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, distance between parallel sides is a same in any pair. 9. The honeycomb filter according to claim 5, wherein the outer wall has corner portions, andwherein the exhaust gas introduction sub-cells and the exhaust gas emission sub-cells adjacent to the outer wall are formed in such a manner that sides of the exhaust gas introduction sub-cells and the exhaust gas emission sub-cells in contact with the outer wall are straight and parallel to a side defining an outer periphery of the outer wall to make a thickness of the outer wall uniform excluding the corner portions. 10. The honeycomb filter according to claim 3, wherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, the exhaust gas emission cells, the first exhaust gas introduction cells, and the second exhaust gas introduction cells each have a square cross section. 11. The honeycomb filter according to claim 10, wherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, the cross-sectional area of each of the second exhaust gas introduction cells is equal to a cross-sectional area of each of the exhaust gas emission cells, andwherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, the cross-sectional area of each of the first exhaust gas introduction cells is about 20% to about 50% of the cross-sectional area of each of the second exhaust gas introduction cells. 12. The honeycomb filter according to claim 10, wherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, the exhaust gas emission cells each have a square cross section, the first exhaust gas introduction cells each have a square cross section, and the second exhaust gas introduction cells each have a square cross section,wherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, the cross-sectional shape of each of the second exhaust gas introduction cells is congruent with a cross-sectional shape of each of the exhaust gas emission cells,wherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, the exhaust gas emission cells, the first exhaust gas introduction cells, and the second exhaust gas introduction cells are arranged in a manner that the exhaust gas emission cells are each surrounded by four first exhaust gas introduction cells among the first exhaust gas introduction cells and four second exhaust gas introduction cells among the second exhaust gas introduction cells, which are alternately arranged, across the porous cell walls,provided that hypothetical segments are drawn which connect a centroid of each square cross section of the four second exhaust gas introduction cells surrounding a reference exhaust gas emission cell among the exhaust gas emission cells, then an intersection of two hypothetical segments among the hypothetical segments intersecting a shape region corresponding to the cross-sectional shape of the reference exhaust gas emission cell coincides with a centroid of the square cross section of the reference exhaust gas emission cell, andfour hypothetical segments among the hypothetical segments that do not intersect the shape region corresponding to the cross-sectional shape of the reference exhaust gas emission cell form a square, and a midpoint of each side of the square coincides with a centroid of each square cross section of the four first exhaust gas introduction cells surrounding the reference exhaust gas emission cell,wherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, a side facing one of the first exhaust gas introduction cells across a first porous cell wall among the porous cell walls among sides forming the cross-sectional shape of one of the exhaust gas emission cells is parallel to a side facing the one of the exhaust gas emission cells across the first porous cell wall among sides forming the cross-sectional shape of the one of the first exhaust gas introduction cells,wherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, a side facing one of the second exhaust gas introduction cells across a second porous cell wall among the porous cell walls among sides forming the cross-sectional shape of one of the first exhaust gas introduction cells is parallel to a side facing the one of the first exhaust gas introduction cells across the second porous cell wall among sides forming the cross-sectional shape of the one of the second exhaust gas introduction cells, andwherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, distance between parallel sides is a same in any pair. 13. The honeycomb filter according to claim 10, wherein the outer wall has corner portions, andwherein the exhaust gas introduction sub-cells and the exhaust gas emission sub-cells adjacent to the outer wall are formed in such a manner that sides of the exhaust gas introduction sub-cells and the exhaust gas emission sub-cells in contact with the outer wall are straight and parallel to a side defining an outer periphery of the outer wall to make a thickness of the outer wall uniform excluding the corner portions. 14. The honeycomb filter according to claim 3, wherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, vertex portions of the polygonal shape are roundly chamfered. 15. The honeycomb filter according to claim 3, wherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, the exhaust gas emission cells, the first exhaust gas introduction cells, and the second exhaust gas introduction cells are point-symmetrical polygons each having not more than eight sides. 16. The honeycomb filter according to claim 1, wherein the exhaust gas introduction cells include first exhaust gas introduction cells and second exhaust gas introduction cells having a larger cross-sectional area than the first exhaust gas introduction cells in the cross section perpendicular to the longitudinal direction of the plurality of cells,wherein a cross-sectional area of each of the exhaust gas emission cells in the cross section perpendicular to the longitudinal direction of the plurality of cells is equal to or larger than a cross-sectional area of each of the second exhaust gas introduction cells in the cross section perpendicular to the longitudinal direction of the plurality of cells, andwherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, the exhaust gas introduction cells and the exhaust gas emission cells are formed by curved lines, andwherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, each of first porous cell walls among the porous cell walls separating the first exhaust gas introduction cells and the exhaust gas emission cells is thinner than each of second porous cell walls among the porous cell walls separating the second exhaust gas introduction cells and the exhaust gas emission cells. 17. The honeycomb filter according to claim 16, wherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, the exhaust gas introduction cells and the exhaust gas emission cells are formed by curved lines, andwherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, a thickness of the first porous cell walls each separating the first exhaust gas introduction cells and the exhaust gas emission cells is about 40% to about 75% of a thickness of the second porous cell walls each separating the second exhaust gas introduction cells and the exhaust gas emission cells. 18. The honeycomb filter according to claim 16, wherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, the exhaust gas emission cells, the first exhaust gas introduction cells, and the second exhaust gas introduction cells are all circular. 19. The honeycomb filter according to claim 16, wherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, the exhaust gas emission cells and the second exhaust gas introduction cells each have a convex square cross section formed by four outwardly curved lines, andwherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, the first exhaust gas introduction cells each have a concave square cross section formed by four inwardly curved lines. 20. The honeycomb filter according to claim 16, wherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, the cross-sectional area of each of the second exhaust gas introduction cells is equal to the cross-sectional area of each of the exhaust gas emission cells, andwherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, a cross-sectional area of each of the first exhaust gas introduction cells is about 20% to about 50% of the cross-sectional area of each of the second exhaust gas introduction cells. 21. The honeycomb filter according to claim 3, wherein the exhaust gas introduction cells consist of the first exhaust gas introduction cells and the second exhaust gas introduction cells. 22. The honeycomb filter according to claim 1, wherein the honeycomb filter comprises at least one honeycomb fired body, andwherein the at least one honeycomb fired body includes one of silicon carbide and silicon-containing silicon carbide. 23. The honeycomb filter according to claim 1, wherein the porous cell walls have a thickness of about 0.10 mm to about 0.46 mm. 24. The honeycomb filter according to claim 1, wherein the porous cell walls have a porosity of about 40% to about 65%. 25. The honeycomb filter according to claim 1, wherein the porous cell walls have pores having an average pore diameter of about 8 μm to about 25 μm. 26. The honeycomb filter according to claim 1, further comprising: a peripheral coat layer provided on a periphery of the honeycomb filter. 27. The honeycomb filter according to claim 3, wherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, the first exhaust gas introduction cells, the second exhaust gas introduction cells, and the exhaust gas emission cells each have a uniform cross-sectional shape throughout from the end at the exhaust gas inlet side to the end at the exhaust gas outlet side excluding the plugged portion,wherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, the cross-sectional shape of each of the first exhaust gas introduction cells is different from the cross-sectional shape of each of the second exhaust gas introduction cells, andwherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, a cross-sectional shape of each of the exhaust gas emission cells is different from the cross-sectional shape of each of the first exhaust gas introduction cells. 28. The honeycomb filter according to claim 3, wherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, a cell unit is two-dimensionally repeated in a manner that the first exhaust gas introduction cells and the second exhaust gas introduction cells surrounding each of the exhaust gas emission cells in the cell unit are shared between adjacent cell units,wherein the cell unit has a cell structure such that each of the exhaust gas emission cells is adjacently surrounded fully by the exhaust gas introduction cells across the porous cell walls,the exhaust gas introduction cells include the first exhaust gas introduction cells and the second exhaust gas introduction cells having a larger cross-sectional area than the first exhaust gas introduction cells in the cross section perpendicular to the longitudinal direction of the plurality of cells, andthe cross-sectional area of each of the exhaust gas emission cells in the cross section perpendicular to the longitudinal direction of the plurality of cells is equal to or larger than the cross-sectional area of each of the second exhaust gas introduction cells in the cross section perpendicular to the longitudinal direction of the plurality of cell, andwherein, in the cross section perpendicular to the longitudinal direction of the plurality of cells, the exhaust gas introduction cells and the exhaust gas emission cells have one of a first structure such that the exhaust gas introduction cells and the exhaust gas emission cells each have the polygonal shape, and a side facing one of the exhaust gas emission cells among the sides forming the cross-sectional shape of each of the first exhaust gas introduction cells is longer than a side facing one of the exhaust gas emission cells among the sides forming the cross-sectional shape of each of the second exhaust gas introduction cells, orthe exhaust gas introduction cells and the exhaust gas emission cells each have the polygonal shape, and one of the sides forming the cross-sectional shape of each of the first exhaust gas introduction cells faces one of the exhaust gas emission cells, and none of the sides forming the cross-sectional shape of each of the second exhaust gas introduction cells faces the exhaust gas emission cells, anda second structure such that the exhaust gas introduction cells and the exhaust gas emission cells are formed by curved lines, and each of first porous cell walls among the porous cell walls separating the first exhaust gas introduction cells and the exhaust gas emission cells is thinner than each of second porous cell walls among the porous cell walls separating the second exhaust gas introduction cells and the exhaust gas emission cells.
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이 특허에 인용된 특허 (23)
Beall, Douglas M.; Frost, Rodney I.; Miao, Weiguo, Asymmetric honeycomb wall-flow filter having improved structural strength.
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