IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0300609
(2007-03-26)
|
등록번호 |
US-8252082
(2012-08-28)
|
우선권정보 |
DE-10 2006 024 076 (2006-05-23); DE-10 2006 026 161 (2006-06-06) |
국제출원번호 |
PCT/EP2007/052847
(2007-03-26)
|
§371/§102 date |
20090428
(20090428)
|
국제공개번호 |
WO2007/134897
(2007-11-29)
|
발명자
/ 주소 |
- Komori, Teruo
- Schiller, Christian
- Thuener, Lars
- Huelsmeier, Dominik
- Hoeffken, Tobias
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
0 인용 특허 :
7 |
초록
▼
Cross-sectional geometries of filter elements for soot particle filters are described, allowing uniform loading of the filter element with soot. Starting with hexagonal cell shapes, other polygonal shapes are arranged around them. All the cross-sectional geometries have in common the fact that the c
Cross-sectional geometries of filter elements for soot particle filters are described, allowing uniform loading of the filter element with soot. Starting with hexagonal cell shapes, other polygonal shapes are arranged around them. All the cross-sectional geometries have in common the fact that the cross-sectional area of all inlet channels is larger than the cross-sectional area of all outlet channels.
대표청구항
▼
1. A filter element for filtering exhaust gases from a diesel internal combustion engine, comprising: an inlet area and an outlet area;a plurality of inlet channels;a plurality of outlet channels, the inlet channels and the outlet channels being separated by filter walls made of an open-pored materi
1. A filter element for filtering exhaust gases from a diesel internal combustion engine, comprising: an inlet area and an outlet area;a plurality of inlet channels;a plurality of outlet channels, the inlet channels and the outlet channels being separated by filter walls made of an open-pored material;wherein a cross-sectional area of all the inlet channels is larger than a cross- sectional area of all the outlet channels, a number of inlet channels is greater than a number of outlet channels, and a roundness parameter fin of the cross section of all the inlet channels is smaller than a roundness parameter fout of the cross section of all the outlet channels, roundness parameter f being defined by equation: f=4πAU2where A is a cross-sectional area of a channel and U is a circumference of a channel. 2. The filter element as recited in claim 1, wherein a cross section of the filter element is formed by joining a plurality of hexagonal unit cells, each of the unit cells is composed of equilateral triangles, each of the triangles is in mirror symmetry with neighboring triangles with respect to a common side of the triangle, in each triangle there are three filter walls, and each of the filter walls runs orthogonally to one side of the triangle. 3. The filter element as recited in claim 2, wherein a point of intersection of the filter walls is located inside the triangle. 4. The filter element as recited in claim 1, wherein a cross section of the filter element is formed by joining multiple hexagonal unit cells, each of the unit cells is composed of equilateral triangles, each of the triangles is in mirror symmetry with neighboring triangles with regard to a common side of the triangle, a central outlet channel is situated at a midpoint of each of the unit cells, the central outlet channel is surrounded by six inlet channels, and the inlet channels have a shape of a regular hexagon with three first sides and three second sides. 5. The filter element as recited in claim 4, wherein the first sides and the second sides of the inlet channels alternate with one another. 6. The filter element as recited in claim 4, wherein a ratio of lengths of the first sides and of the second sides is in a range from 0.3 to 1.5. 7. The filter element as recited in claim 6, wherein the range is from 0.6 to 0.75. 8. The filter element as recited in claim 4, wherein two neighboring sides of a hexagonal inlet channel form an angle of 60°. 9. The filter element as recited in claim 1, wherein a cross section of the filter element is formed by joining multiple hexagonal unit cells together, a central outlet channel is situated at a midpoint of each of the unit cells, a central outlet channel is surrounded by six inlet channels, the inlet channels have a shape of a polygon in mirror symmetry in cross section, and each of four inlet channels situated in proximity to one another surrounds an outer outlet channel. 10. The filter element as recited in claim 9, wherein the outer outlet channels have a cross-sectional form of a cube or a rhombus. 11. The filter element as recited in claim 4, wherein a central one of the outlet channels has a shape of an equilateral hexagon in cross section or is circular. 12. The filter element as recited in claim 4, wherein a basic structure of the filter element has a cell density of 200 cpsi (cells per square inch) to 450 cpsi. 13. The filter element as recited in claim 12, wherein the cell density is 300 to 350 cpsi. 14. The filter element as recited in claim 4, wherein a wall thickness of the filter walls is 0.1 mm to 1.2 mm. 15. The filter element as recited in claim 14, wherein the wall thickness is 0.25 mm to 0.50 mm. 16. The filter element as recited in claim 4, wherein the filter element is produced by extrusion. 17. The filter element as recited in claim 4, wherein the filter element is manufactured from a ceramic or a glass ceramic material. 18. The filter element as recited in claim 17, wherein the filter element is manufactured from one of cordierite, aluminum titanate or silicon carbide. 19. The filter element as recited in claim 4, wherein the filter element is manufactured from sintered metal. 20. The filter element as recited in claim 4, wherein the inlet channels begin at the inlet area and are sealed at the outlet area, and the outlet channels are sealed at the inlet area and end at the outlet area. 21. The filter element as recited in claim 4, wherein a porosity of a filter material is in a range between 30% and 70%, and an average pore size of the filter material is in a range between 5 micrometers and 30 micrometers. 22. The filter element as recited in claim 21, wherein an amount of pores whose diameter is at least twice as great as the average pore size is at most 30% of a volume of all pores. 23. The filter element as recited in claim 4, wherein a thermal capacity based on a total volume of the filter element is at least 400 Joules/liter Kelvin [J/LK]. 24. The filter element as recited in claim 23, wherein the thermal capacity is between 500 J/LK and 750 J/LK. 25. A filter unit having a filter element, a housing and an exhaust pipe, the filter element comprising: an inlet area and an outlet area;a plurality of inlet channels;a plurality of outlet channels, the inlet channels and the outlet channels being separated by filter walls made of an open-pored material;wherein a cross-sectional area of all the inlet channels is larger than a cross- sectional area of all the outlet channels, a number of inlet channels is greater than a number of outlet channels, and a roundness parameter fin of the cross section of all the inlet channels is smaller than a roundness parameter fout of the cross section of all the outlet channels, roundness parameter f being defined by equation: f=4πAU2where A is a cross-sectional area of a channel and U is a circumference of a channel. 26. A filter element for filtering exhaust gases from a diesel internal combustion engine, comprising: an inlet area and an outlet area;a plurality of inlet channels;a plurality of outlet channels, the inlet channels and the outlet channels being separated by filter walls made of an open-pored material;wherein a cross-sectional area of all the inlet channels is larger than a cross-sectional area of all the outlet channels, a number of inlet channels is greater than a number of outlet channels, and a roundness parameter fin of the cross section of the inlet channels is smaller than a roundness parameter fout of the cross section of the outlet channels, roundness parameter f being defined by equation: f=4πAU2where A is a cross-sectional area of a channel and U is a circumference of a channel;wherein a cross section of the filter element is formed by joining a plurality of hexagonal unit cells, each of the unit cells is composed of equilateral triangles, each of the triangles is in mirror symmetry with neighboring triangles with respect to a common side of the triangle, in each triangle there are three filter walls, and each of the filter walls runs orthogonally to one side of the triangle. 27. The filter element as recited in claim 26, wherein a point of intersection of the filter walls is located inside the triangle. 28. A filter element for filtering exhaust gases from a diesel internal combustion engine, comprising: an inlet area and an outlet area;a plurality of inlet channels;a plurality of outlet channels, the inlet channels and the outlet channels being separated by filter walls made of an open-pored material;wherein a cross-sectional area of all the inlet channels is larger than a cross-sectional area of all the outlet channels, a number of inlet channels is greater than a number of outlet channels, and a roundness parameter fin of the cross section of the inlet channels is smaller than a roundness parameter fout of the cross section of the outlet channels, roundness parameter f being defined by equation: f=4πAU2where A is a cross-sectional area of a channel and U is a circumference of a channel;wherein a cross section of the filter element is formed by joining multiple hexagonal unit cells, each of the unit cells is composed of equilateral triangles, each of the triangles is in mirror symmetry with neighboring triangles with regard to a common side of the triangle, a central outlet channel is situated at a midpoint of each of the unit cells, the central outlet channel is surrounded by six inlet channels, and the inlet channels have a shape of a regular hexagon with three first sides and three second sides. 29. The filter element as recited in claim 28, wherein the first sides and the second sides of the inlet channels alternate with one another. 30. The filter element as recited in claim 28, wherein a ratio of lengths of the first sides and of the second sides is in a range from 0.3 to 1.5. 31. The filter element as recited in claim 30, wherein the range is from 0.6 to 0.75. 32. The filter element as recited in claim 28, wherein two neighboring sides of a hexagonal inlet channel form an angle of 60°. 33. The filter element as recited in claim 26, wherein the cross section of the filter element is formed by joining multiple hexagonal unit cells together, a central outlet channel is situated at a midpoint of each of the unit cells, the central outlet channel is surrounded by six inlet channels, the inlet channels have a shape of a polygon in mirror symmetry in cross section, and each of four inlet channels situated in proximity to one another surrounds an outer outlet channel. 34. The filter element as recited in claim 33, wherein the outer outlet channel has a cross-sectional form of a cube or a rhombus. 35. The filter element as recited in claim 28, wherein the central outlet channel has a shape of an equilateral hexagon in cross section or is circular. 36. The filter element as recited in claim 26, wherein a basic structure of the filter element has a cell density of 200 cpsi (cells per square inch) to 450 cpsi. 37. The filter element as recited in claim 36, wherein the cell density is 300 to 350 cpsi. 38. The filter element as recited in claim 26, wherein a wall thickness of the filter walls is 0.1 mm to 1.2 mm. 39. The filter element as recited in claim 38, wherein the wall thickness is 0.25 mm to 0.50 mm. 40. The filter element as recited in claim 26, wherein the filter element is produced by extrusion. 41. The filter element as recited in claim 26, wherein the filter element is manufactured from a ceramic or a glass ceramic material. 42. The filter element as recited in claim 41, wherein the filter element is manufactured from one of cordierite, aluminum titanate or silicon carbide. 43. The filter element as recited in claim 26, wherein the filter element is manufactured from sintered metal. 44. The filter element as recited in claim 26, wherein the inlet channels begin at the inlet area and are sealed at the outlet area, and the outlet channels are sealed at the inlet area and end at the outlet area. 45. The filter element as recited in claim 26, wherein a porosity of a filter material is in a range between 30% and 70%, and an average pore size of the filter material is in a range between 5 micrometers and 30 micrometers. 46. The filter element as recited in claim 45, wherein an amount of pores whose diameter is at least twice as great as the average pore size is at most 30% of a volume of all pores. 47. The filter element as recited in claim 26, wherein a thermal capacity based on a total volume of the filter element is at least 400 Joules/liter Kelvin [J/LK]. 48. The filter element as recited in claim 47, wherein the thermal capacity is between 500 J/LK and 560 J/LK. 49. A filter unit having a filter element, a housing and an exhaust pipe, the filter element comprising: an inlet area and an outlet area;a plurality of inlet channels;a plurality of outlet channels, the inlet channels and the outlet channels being separated by filter walls made of an open-pored material;wherein a cross-sectional area of all the inlet channels is larger than a cross-sectional area of all the outlet channels, a number of inlet channels is greater than a number of outlet channels, and a roundness parameter fin of the cross section of the inlet channels is smaller than a roundness parameter fout of the cross section of the outlet channels, roundness parameter f being defined by equation: f=4πAU2where A is a cross-sectional area of a channel and U is a circumference of a channel;wherein a cross section of the filter element is formed by joining a plurality of hexagonal unit cells, each of the unit cells is composed of equilateral triangles, each of the triangles is in mirror symmetry with neighboring triangles with respect to a common side of the triangle, in each triangle there are three filter walls, and each of the filter walls runs orthogonally to one side of the triangle.
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