IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0255951
(2010-03-12)
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등록번호 |
US-8793974
(2014-08-05)
|
우선권정보 |
JP-2009-110495 (2009-04-30); JP-2010-019932 (2010-02-01) |
국제출원번호 |
PCT/JP2010/054216
(2010-03-12)
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§371/§102 date |
20110912
(20110912)
|
국제공개번호 |
WO2010/125865
(2010-11-04)
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발명자
/ 주소 |
- Aketa, Masahiro
- Sugimoto, Satoshi
- Ueda, Masato
- Yoshita, Yuki
- Yanagimoto, Takuya
- Tochimoto, Masayuki
|
출원인 / 주소 |
|
대리인 / 주소 |
Panitch Schwarze Belisario & Nadel LLP
|
인용정보 |
피인용 횟수 :
0 인용 특허 :
3 |
초록
▼
The present invention relates to an exhaust gas treatment device of a diesel engine that is capable of increasing the concentration of PM in the EGR gas, wherein an exhaust gas separator 2 has electrodes 12 and 13 having different polarities from each other to allow the PM in the exhaust gas 3 to be
The present invention relates to an exhaust gas treatment device of a diesel engine that is capable of increasing the concentration of PM in the EGR gas, wherein an exhaust gas separator 2 has electrodes 12 and 13 having different polarities from each other to allow the PM in the exhaust gas 3 to be charged to a given polarity by means of corona discharge between the electrodes 12 and 13 and thus to permit a peripheral wall 14 surrounding the exhaust gas swirl chamber 9 to have the electrode 13 having the opposite polarity to the charged PM, and the charged PM in the exhaust gas 3 swirling the exhaust gas swirl chamber 9 is localizedly positioned around the peripheral wall 14 of the exhaust gas swirl chamber 9 through a centrifugal force and an electrostatic force to allow the exhaust gas 3 containing the localizedly positioned PM to be separated as the EGR gas 4 and sent to a terminal end portion 15 of the exhaust gas swirl chamber 9, while the exhaust gas 3 around the central cylinder 7 is being separated as the emission gas 5 and sent to the interior of the central cylinder 7 through the plurality of emission gas entry holes 8.
대표청구항
▼
1. An exhaust gas treatment device of a diesel engine having an exhaust gas separator (2) disposed on an exhaust gas flow passage (1) to allow particulate material (PM) in exhaust gas (3) to be localizedly positioned and thus to separate the exhaust gas (3) into EGR gas (4) containing the localizedl
1. An exhaust gas treatment device of a diesel engine having an exhaust gas separator (2) disposed on an exhaust gas flow passage (1) to allow particulate material (PM) in exhaust gas (3) to be localizedly positioned and thus to separate the exhaust gas (3) into EGR gas (4) containing the localizedly positioned PM and emission gas (5) as the rest of the exhaust gas (3), thereby recirculating the EGR gas (4) to a combustion chamber (42) and emitting the emission gas (5) to the air, the exhaust gas treatment device comprising: a central cylinder (7) disposed at the center of the exhaust gas separator (2), having an emission gas entry opening, an outlet (30) having a peripheral wall (37), and a plurality of discharge protrusions (6) protruding from an outer periphery of the central cylinder (7);an exhaust gas swirl chamber (9), having a peripheral wall (14), surrounding the central cylinder (7), so that the plurality of discharge protrusions (6) protrude toward the peripheral wall (14) of the exhaust gas swirl chamber (9);an exhaust gas deflection guide wall (18) adjacent the discharge protrusions (6);an exhaust gas swirl approach passage (26), having a peripheral wall (33), along a spirally formed approach guide wall (26a) on an upstream side of the exhaust gas swirl chamber (9); andan emission gas-emitting passage (27), having a peripheral wall (27a) divided into a peripheral wall (35) of an inlet (28) thereof and a peripheral wall (36) downstream from the peripheral wall (35), the peripheral wall (35) of the inlet (28) being interposed between the downstream side peripheral wall (36) of the emission gas-emitting passage (27) and the peripheral wall (37) of the outlet (30) of the central cylinder (7), the peripheral wall (35) of the inlet (28) of the emission gas-emitting passage (27) being formed of the exhaust gas deflection guide wall (18), such that exhaust gas (3) moving toward the discharge protrusions (6) is deflected by the deflection guide wall (18) to the peripheral wall (14) of the exhaust gas swirl chamber (9) around the discharge protrusions (6), the peripheral wall (35) of the inlet (28) being molded of an electrical insulator to electrically insulate the peripheral wall (14) of the exhaust gas swirl chamber (9), the peripheral wall (33) of the exhaust gas swirl approach passage (26) and the downstream side peripheral wall (36) of the emission gas-emitting passage (27),wherein:the exhaust gas separator (2) has electrodes (12, 13) having different polarities from each other to allow the PM in the exhaust gas (3) to be charged to a given polarity by means of corona discharge between the electrodes (12, 13);the central cylinder (7) has electrodes (12) having the same polarity as the charged PM; andthe peripheral wall (14) of the exhaust gas swirl chamber (9), the peripheral wall (33) of the exhaust gas swirl approach passage (26) and the downstream side peripheral wall (36) of the emission gas-emitting passage (27) electrodes (13) having an opposite polarity from electrodes (12) of the central cylinder (7) and the charged PM, so that the charged PM in the exhaust gas (3) swirling the exhaust gas swirl chamber (9) is localizedly positioned around the peripheral wall (14) of the exhaust gas swirl chamber (9) through a centrifugal force and an electrostatic force to allow the exhaust gas (3) containing the localizedly positioned PM to be separated as the EGR gas (4) and sent to a terminal end portion (15) of the exhaust gas swirl chamber (9), while the exhaust gas (3) around the central cylinder (7) is being separated as the emission gas (5) and sent to the interior of the central cylinder (7) through the emission gas entry opening. 2. The exhaust gas treatment device of a diesel engine according to claim 1, wherein the emission gas-emitting passage (27) is formed at a center of the exhaust gas separator (2), the exhaust gas separator (2) is surrounded by the exhaust gas swirl approach passage (26), and the central cylinder (7) includes a starting end portion (29) defining the outlet (30) of the central cylinder (7) and the inlet (28) of the emission gas-emitting passage (27) communicates with the outlet (30) of the central cylinder (7). 3. The exhaust gas treatment device of a diesel engine according to claim 1, wherein the emission gas (5) is emitted to the air without using a diesel particulate filter (DPF) that regenerates by burning and removing the particulate material (PM) caught from the exhaust gas (3). 4. The exhaust gas treatment device of a diesel engine according to claim 1, wherein the central cylinder (7) and the charged particulate material (PM) have the electrode (12) of the same polarity as the plurality of discharge protrusions (6). 5. The exhaust gas treatment device of a diesel engine according to claim 1, wherein the exhaust gas separator (2) is disposed upstream of an exhaust turbine (41) of a supercharger (40). 6. The exhaust gas treatment device of a diesel engine according to claim 1, wherein the exhaust gas separator (2) has a circuit-accommodating case (57) mounted on an end portion thereof to accommodate a boosting circuit (58) therein, wherein a boosted voltage through the boosting circuit (58) is applied to the electrodes (12, 13) of the exhaust gas separator (2). 7. The exhaust gas treatment device of a diesel engine according to claim 6, wherein the boosting circuit (58) has a conductor (59) electrically connected thereto, the conductor (59) being passed through an end wall (60) of the exhaust gas separator (2), such that by means of the conductor (59), the boosted voltage through the boosting circuit (58) is applied to the electrodes (12, 13) of the exhaust gas separator (2). 8. The exhaust gas treatment device of a diesel engine according to claim 1, wherein the emission gas entry opening is comprised of a plurality of emission gas entry holes (8) formed along a periphery wall of the central cylinder (7). 9. The exhaust gas treatment device of a diesel engine according to claim 8, wherein each of the emission gas entry holes (8) has an acute angle portion (8a) formed on an opened periphery thereof. 10. The exhaust gas treatment device of a diesel engine according to claim 8, wherein the emission gas entry holes (8) formed toward an interior of the central cylinder (7) from the exhaust gas swirl chamber (9) have a reverse direction to a swirl direction of the exhaust gas (3). 11. The exhaust gas treatment device of a diesel engine according to claim 1, wherein the emission gas entry opening is comprised of a plurality of emission gas entry holes (8) formed along the periphery wall of the central cylinder (7), the plurality of emission gas entry holes (8) being formed serially in an axial direction of the central cylinder (7), and the plurality of discharge protrusions (6) being formed between the emission gas entry holes (8). 12. The exhaust gas treatment device of a diesel engine according to claim 11, wherein the exhaust gas deflection guide wall (18) is disposed on the upstream side of the discharge protrusions (6). 13. The exhaust gas treatment device of a diesel engine according to claim 1, wherein a terminal end wall (20) is disposed along a terminal end portion (19) of the central cylinder (7) surrounded by a terminal end portion (15) of the exhaust gas swirl chamber (9), an EGR gas swirl chamber (21) is disposed adjacent to the terminal end portion (15) of the exhaust gas swirl chamber (9), an EGR gas outlet (23) is formed on a peripheral wall (22) surrounding the EGR gas swirl chamber (21), and gas vent holes (24) are formed along the terminal end wall (20) of the central cylinder (7), such that gas components (25) of the EGR gas (4) overflowing from the center of the EGR gas swirl chamber (21) move from the gas vent holes (24) to an interior of the central cylinder (7), as the emission gas (5). 14. An exhaust gas treatment device of a diesel engine having an exhaust gas separator (2) disposed on an exhaust gas flow passage (1) to allow particulate material (PM) in exhaust gas (3) to be localizedly positioned and thus to separate the exhaust gas (3) into EGR gas (4) containing the localizedly positioned PM and emission gas (5) as the rest of the exhaust gas (3), thereby recirculating the EGR gas (4) to a combustion chamber (42) and emitting the emission gas (5) to the air, the exhaust gas treatment device comprising: a central cylinder (7) disposed at the center of the exhaust gas separator (2), having an emission gas entry opening, and an outlet (30) having a peripheral wall (37);an exhaust gas swirl chamber (9), having a peripheral wall (14), surrounding the central cylinder (7);an exhaust gas swirl approach passage (26), having a peripheral wall (33), along a spirally formed approach guide wall (26a) on an upstream side of the exhaust gas swirl chamber (9)an emission gas-emitting passage (27), having a peripheral wall (27a) divided into a peripheral wall (35) of an inlet (28) thereof and a peripheral wall (36) downstream from the peripheral wall (35), the peripheral wall (35) of the inlet (28) being interposed between the downstream side peripheral wall (36) of the emission gas-emitting passage (27) and the peripheral wall (37) of the outlet (30) of the central cylinder (7), the peripheral wall (35) of the inlet (28) of the emission gas-emitting passage (27) being molded of an electrical insulator to electrically insulate the peripheral wall (14) of the exhaust gas swirl chamber (9), the peripheral wall (33) of the exhaust gas swirl approach passage (26) and the downstream side peripheral wall (36) of the emission gas-emitting passage (27); andan exhaust manifold integrally molded with the peripheral wall (33) of the exhaust gas swirl approach passage (26) and the downstream side peripheral wall (36) of the emission gas-emitting passage (27),wherein:the exhaust gas separator (2) has electrodes (12, 13) having different polarities from each other to allow the PM in the exhaust gas (3) to be charged to a given polarity by means of corona discharge between the electrodes (12, 13);the peripheral wall (14) of the exhaust gas swirl chamber (9), the peripheral wall (33) of the exhaust gas swirl approach passage (26) and the downstream side a peripheral wall (36) of the emission gas-emitting passage (27) have electrodes (13) having an opposite polarity from electrodes (12) of the charged PM, so that the charged PM in the exhaust gas (3) swirling the exhaust gas swirl chamber (9) is localizedly positioned around the peripheral wall (14) of the exhaust gas swirl chamber (9) through a centrifugal force and an electrostatic force to allow the exhaust gas (3) containing the localizedly positioned PM to be separated as the EGR gas (4) and sent to a terminal end portion (15) of the exhaust gas swirl chamber (9), while the exhaust gas (3) around the central cylinder (7) is being separated as the emission gas (5) and sent to the interior of the central cylinder (7) through the emission gas entry. 15. An exhaust gas treatment device of a diesel engine having an exhaust gas separator (2) disposed on an exhaust gas flow passage (1) to allow particulate material (PM) in exhaust gas (3) to be localizedly positioned and thus to separate the exhaust gas (3) into EGR gas (4) containing the localizedly positioned PM and emission gas (5) as the rest of the exhaust gas (3), thereby recirculating the EGR gas (4) to a combustion chamber (42) and emitting the emission gas (5) to the air, the exhaust gas treatment device comprising: a central cylinder (7) disposed at the center of the exhaust gas separator (2), having an emission gas entry opening, and a plurality of discharge protrusions (6) protruding from an outer periphery of the central cylinder (7), said emission gas entry opening comprising a plurality of emission gas entry holes (8) formed along a periphery wall of the central cylinder (7), the plurality of emission gas entry holes (8) being formed serially in an axial direction of the central cylinder (7), and the plurality of discharge protrusions (6) being formed between the emission gas entry holes (8);an exhaust gas swirl chamber (9), having a peripheral wall (14), surrounding the central cylinder (7), the plurality of discharge protrusions (6) protruding toward the peripheral wall (14) of the exhaust gas swirl chamber (9); andan exhaust gas deflection guide wall (18) formed upstream of the discharge protrusions (6), such that exhaust gas (3) moving toward the discharge protrusions (6) is deflected by the deflection guide wall (18) to the peripheral wall (14) of the exhaust gas swirl chamber (9) around the discharge protrusions (6);wherein:the exhaust gas separator (2) has electrodes (12, 13) having different polarities from each other to allow the PM in the exhaust gas (3) to be charged to, a given polarity by means of corona discharge between the electrodes (12, 13);the central cylinder (7) has electrodes (12) having the same polarity as the charged PM; andthe peripheral wall (14) of the exhaust gas swirl chamber (9) having an opposite polarity to the charged PM, so that the charged PM in the exhaust gas (3) swirling the exhaust gas swirl chamber (9) is localizedly positioned around the peripheral wall (14) of the exhaust gas swirl chamber (9) through a centrifugal force and an electrostatic force to allow the exhaust gas (3) containing the localizedly positioned PM to be separated as the EGR gas (4) and sent to a terminal end portion (15) of the exhaust gas swirl chamber (9), while the exhaust gas (3) around the central cylinder (7) is being separated as the emission gas (5) and sent to the interior of the central cylinder (7) through the emission gas entry opening. 16. An exhaust gas treatment device of a diesel engine having an exhaust gas separator (2) disposed on an exhaust gas flow passage (1) to allow particulate material (PM) in exhaust gas (3) to be localizedly positioned and thus to separate the exhaust gas (3) into EGR gas (4) containing the localizedly positioned PM and emission gas (5) as the rest of the exhaust gas (3), thereby recirculating the EGR gas (4) to a combustion chamber (42) and emitting the emission gas (5) to the air, the exhaust gas treatment device comprising: a central cylinder (7) disposed at the center of the exhaust gas separator (2), having an emission gas entry opening;an exhaust gas swirl chamber (9), having a peripheral wall (14), surrounding the central cylinder (7);a terminal end wall (20) disposed along a terminal end portion (19) of the central cylinder (7), upstream from the emission gas entry opening of the central cylinder (7), and surrounded by a terminal end portion (15) of the exhaust gas swirl chamber (9),an EGR gas swirl chamber (21) disposed adjacent to the terminal end portion (15) of the exhaust gas swirl chamber (9);an EGR gas outlet (23) formed on a peripheral wall (22) surrounding the EGR gas swirl chamber (21), anda plurality of gas vent holes (24) formed along the terminal end wall (20) of the central cylinder (7), such that gas components (25) of the EGR gas (4) overflowing from the center of the EGR gas swirl chamber (21) can move from the gas vent holes (24) to an interior of the central cylinder (7), as the emission gas (5);wherein:the exhaust gas separator (2) has electrodes (12, 13) having different polarities from each other to allow the PM in the exhaust gas (3) to be charged to a given polarity by means of corona discharge between the electrodes (12, 13); andthe peripheral wall (14) of the exhaust gas swirl chamber (9) having an opposite polarity to the charged PM, so that the charged PM in the exhaust gas (3) swirling the exhaust gas swirl chamber (9) is localizedly positioned around the peripheral wall (14) of the exhaust gas swirl chamber (9) through a centrifugal force and an electrostatic force to allow the exhaust gas (3) containing the localizedly positioned PM to be separated as the EGR gas (4) and sent to the terminal end portion (15) of the exhaust gas swirl chamber (9), while the exhaust gas (3) around the central cylinder (7) is being separated as the emission gas (5) and sent to the interior of the central cylinder (7) through the emission gas entry opening. 17. The exhaust gas treatment device of a diesel engine according to claim 16, wherein the peripheral wall (22) of the EGR gas swirl chamber (21) has an electrode (13) having a different polarity from the charged PM. 18. The exhaust gas treatment device of a diesel engine according to claim 17, wherein the terminal end wall (20) of the central cylinder (7) has an electrode (12) having the same polarity as the charged PM. 19. The exhaust gas treatment device of a diesel engine according to claim 18, wherein each of the gas vent holes (24) has an acute angle portion (24a) formed on an opened periphery thereof. 20. The exhaust gas treatment device of a diesel engine according to claim 16, wherein the gas vent holes (24) formed toward an interior of the central cylinder (7) from the center of the EGR gas swirl chamber (21) have a reverse direction to a swirl direction of the EGR gas (4).
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