An exhaust device for a diesel engine supplies liquid fuel (6) from a supply source (5) of the liquid fuel (6) to a gas generator (3) which converts the liquid fuel (6) to flammable gas (7) and from which a flammable-gas supply passage (8) is conducted, the flammable-gas supply passage (8) having a
An exhaust device for a diesel engine supplies liquid fuel (6) from a supply source (5) of the liquid fuel (6) to a gas generator (3) which converts the liquid fuel (6) to flammable gas (7) and from which a flammable-gas supply passage (8) is conducted, the flammable-gas supply passage (8) having a flammable-gas outlet (9) communicated with an exhaust-gas route (1) upstream of a diesel-particulate-filter (2), the flammable gas (7) flowed out of the flammable-gas outlet (9) being burnt in exhaust gas (10) to generate combustion heat which can burn fine particles of the exhaust gas (10) remaining at the filter (2). In this exhaust device for a diesel engine, a case (11) for containing the filter (2) accommodates at least part of the gas generator (3).
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What we claim is: 1. An exhaust device for a diesel engine, that supplies liquid fuel (6) from a supply source (5) of the liquid fuel (6) to a gas generator (3) which converts the liquid fuel (6) to flammable gas (7) and from which a flammable-gas supply passage (8) is conducted, the flammable-gas
What we claim is: 1. An exhaust device for a diesel engine, that supplies liquid fuel (6) from a supply source (5) of the liquid fuel (6) to a gas generator (3) which converts the liquid fuel (6) to flammable gas (7) and from which a flammable-gas supply passage (8) is conducted, the flammable-gas supply passage (8) having a flammable-gas outlet (9) communicated with an exhaust-gas route (1) upstream of a diesel-particulate-filter (2), the flammable gas (7) flowed out of the flammable-gas outlet (9) being burnt in exhaust gas (10) to generate combustion heat which can burn fine particles of the exhaust gas (10) remaining at the filter (2), wherein a case (11) for containing the filter (2) accommodates at least part of the gas generator (3), when providing the gas generator (3) with a catalyst chamber (51), within which a catalyst (51a) is accommodated, a heat-conduction plate (52) is arranged at an upper portion of the catalyst chamber (51) and a fuel-passing gap (53) is formed along an upper surface of the heat-conduction plate (52), the fuel-passing gap (53) being supplied with the liquid fuel (6) and with the air (44) and having a peripheral edge opened to provide a fuel outlet (54) to the catalyst chamber (51), catalytic combustion heat generated within the catalyst chamber (15) is conducted through the heat-conduction plate (52) to the fuel-passing gap (53), and the heat conduction-plate (52) has a mid portion from which an exothermic portion (45a) of a glow plug (45) projects downwards, and a metal guide plate (56) is arranged below the heat-conduction plate (52), the guide plate (56) being downwardly inclined from a peripheral edge portion (56a) underneath the fuel outlet (54) to below an exothermic portion (45a) of the glow plug (45), thereby receiving the liquid fuel (6) flowed out of the fuel outlet (54) by the peripheral edge portion (56a) of the guide plate (56) to guide it by the guide plate (56) so as to approach the exothermic portion (45a) of the glow plug (45). 2. The exhaust device for a diesel engine as set forth in claim 1, wherein fuel from a fuel reservoir (5a) of the diesel engine is used as the liquid fuel (6) and when mixing air (44) into the liquid fuel (6), used as this air (44) is the air from a supercharger (39). 3. The exhaust device for a diesel engine as set forth in claim 1, wherein when the glow plug (45) generates heat, the heat generated by the glow plug (45) is conducted through the heat-conduction plate (52) to the fuel-passing gap (53). 4. The exhaust device for a diesel engine as set forth in claim 1, wherein the gas generator (3) vaporizes the liquid fuel (6) to convert it into the flammable gas (7). 5. The exhaust device for a diesel engine as set forth in claim 1, wherein the gas generator (3) partially oxidizes the liquid fuel (6) to convert it into flammable gas (7) containing carbon monoxide and hydrogen. 6. The exhaust device for a diesel engine as set forth in claim 1, wherein a metal flame-quenching material (57) of a cubic mesh-structure is filled into a space between the heat-conduction plate (52) and the guide plate (56), when the glow plug (45) generates heat, the heat generated by the glow plug (45) is conducted through the flame-quenching material (57) to the heat-conduction plate (52) and the guide plate (56), and during the catalytic combustion within the catalyst chamber (51), the generated catalytic combustion heat is conducted through the guide plate (56) and the flame-quenching material (57) to the heat-conduction plate (52). 7. The exhaust device for a diesel engine as set forth in claim 6, wherein the guide plate (56) has an under surface with which the catalyst (51a) within the catalyst chamber (51) is brought into contact. 8. The exhaust device for a diesel engine as set forth in claim 6, wherein a catalyst component is supported on the flame-quenching material (57). 9. An exhaust device for a diesel engine, that supplies liquid fuel (6) from a supply source (5) of the liquid fuel (6) to a gas generator (3) which converts the liquid fuel (6) to flammable gas (7) and from which a flammable-gas supply passage (8) is conducted, the flammable-gas supply passage (8) having a flammable-gas outlet (9) communicated with an exhaust-gas route (1) upstream of a diesel-particulate-filter (2), the flammable gas (7) flowed out of the flammable-gas outlet (9) being burnt in exhaust gas (10) to generate combustion heat which can burn fine particles of the exhaust gas (10) remaining at the filter (2), wherein a case (11) for containing the filter (2) accommodates at least part of the gas generator (3), an oxidation catalyst (12) for accelerating the combustion of the flammable gas (7) is disposed between the flammable-gas outlet (9) and an inlet (2a) of the filter (2), in order to flow the flammable gas (7) heated by the exothermic reaction within the gas generator (3) from the flammable-gas outlet (9) to the oxidation catalyst (12), the oxidation catalyst (12) is filled within an oxidation-catalyst accommodating case (65) and the flammable-gas outlet (9) is opened into the oxidation catalyst (12), the oxidation-catalyst accommodating case (65) having a peripheral wall (66) provided with a plurality of exhaust-gas inlets (67) and having a terminal end portion (68) provided with an exhaust-gas outlet (69), and when arranging the exhaust-gas inlets (67) side by side in the peripheral wall (66) of the oxidation-catalyst accommodating case (65) from a beginning end portion (70) of the case (65) toward a terminal end portion (68) thereof, the peripheral wall (66) of the oxidation-catalyst accommodating case (65) is progressively increasing in its diameter from the beginning end portion (70) toward the terminal end portion (68). 10. The exhaust device for a diesel engine as set forth in claim 9, wherein employed as the oxidation catalyst (12) is a catalyst which comprises a catalyst component supported on a metal substrate of a cubic mesh-structure. 11. An exhaust device for a diesel engine, that supplies liquid fuel (6) from a supply source (5) of the liquid fuel (6) to a gas generator (3) which converts the liquid fuel (6) to flammable gas (7) and from which a flammable-gas supply passage (8) is conducted, the flammable-gas supply passage (8) having a flammable-gas outlet (9) communicated with an exhaust-gas route (1) upstream of a diesel-particulate-filter (2), the flammable gas (7) flowed out of the flammable-gas outlet (9) being burnt in exhaust gas (10) to generate combustion heat which can burn fine particles of the exhaust gas (10) remaining at the filter (2), wherein a case (11) for containing the filter (2) accommodates at least part of the gas generator (3), an oxidation catalyst (12) for accelerating the combustion of the flammable gas (7) is disposed between the flammable-gas outlet (9) and an inlet (2a) of the filter (2), a cylindrical filter-containing case (11) having end walls (17) and (18) at its both ends is utilized, an axial direction of this filter-containing case (11) being taken as a front and rear direction, a side of the inlet (2a) of the filter (2) being determined as ‘front’ and a side of an outlet (2b) being defined as ‘rear’, an exhaust-gas inlet chamber (19) being provided in front of the filter (2) and an exhaust-gas outlet chamber (20) being provided at the rear of the filter (2) within the filter-containing case (11), an exhaust-gas inlet pipe (21) being communicated with the exhaust-gas inlet chamber (19) and an exhaust-gas outlet pipe (22) being communicated with the exhaust-gas outlet chamber (20), and the exhaust-gas inlet pipe (21) is inserted into the exhaust-gas inlet chamber (19) along a radial direction of the filter-containing case (11), within the exhaust-gas inlet pipe (21) the oxidation catalyst (12) and at least part of the gas generator (3) are arranged in the mentioned order from the upstream side of the exhaust gas, the flammable-gas supply passage (8) led out of the gas generator (3) being inserted into the oxidation catalyst (12). 12. The exhaust device for a diesel engine as set forth in claim 11, wherein an exhaust muffler (28) is used as the filter-containing case (11) and the exhaust-gas inlet chamber (19) is formed from a first expansion chamber (29), the exhaust-gas outlet chamber (20) being composed of a final expansion chamber (30), the exhaust-gas inlet pipe (21) being formed from an exhaust-gas lead-in pipe (31) of the first expansion chamber (29), the exhaust-gas outlet pipe (22) being composed of an exhaust-gas lead-out pipe (32) of the final expansion chamber (30). 13. An exhaust device for a diesel engine, that supplies liquid fuel (6) from a supply source (5) of the liquid fuel (6) to a gas generator (3) which converts the liquid fuel (6) to flammable gas (7) and from which a flammable-gas supply passage (8) is conducted, the flammable-gas supply passage (8) having a flammable-gas outlet (9) communicated with an exhaust-gas route (1) upstream of a diesel-particulate-filter (2), the flammable gas (7) flowed out of the flammable-gas outlet (9) being burnt in exhaust gas (10) to generate combustion heat which can burn fine particles of the exhaust gas (10) remaining at the filter (2), wherein a case (11) for containing the filter (2) accommodates at least part of the gas generator (3), an oxidation catalyst (12) for accelerating the combustion of the flammable gas (7) is disposed between the flammable-gas outlet (9) and an inlet (2a) of the filter (2), and in order to flow the flammable gas (7) heated by the exothermic reaction within the gas generator (3) from the flammable-gas outlet (9) to the upstream side of the oxidation catalyst (12), an upstream oxidation-passage (14) is formed upstream of the oxidation catalyst (12) within an exhaust-gas passage (13), which is formed into a double-cylinder structure, and an upstream oxidation-catalyst (15) is accommodated within the upstream oxidation-passage (14), the flammable-gas outlet (9) being opened into the upstream oxidation-passage (14) on an upstream side of the upstream oxidation-catalyst (15).
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이 특허에 인용된 특허 (1)
Blaschke Walter,DEX, Burner for the thermal regeneration of a particle filter in an exhaust gas aftertreatment system of an internal combust.
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