CN-121993279-A - Exhaust gas treatment device

CN121993279ACN 121993279 ACN121993279 ACN 121993279ACN-121993279-A

Abstract

The exhaust gas treatment device includes an injection unit 16 injecting urea water into the exhaust pipe 13, a first plate 30 provided upstream of the injection unit 16 in the exhaust pipe 13, an arc-shaped second plate 40 provided in the exhaust pipe 13 in the axial direction and facing the injection unit 16, and a third plate 50 provided downstream of the second plate 40 in the exhaust pipe 13, wherein the first plate 30 includes a first inflow hole 32 formed at a position distant from a central portion of the first plate 30 and a guide portion 33 configured to guide the exhaust gas introduced from the first inflow hole 32 to the injection unit 16, and the third plate 50 includes an outflow hole 52 formed in a central portion of the third plate 50.

Inventors

ISHIKAWA MASAKI
SAKAI KOJI
KAGEYAMA YUUTA
HASEBE Nobutaka
HIGUCHI TETSUNORI
Gong Xiejian
Nan Heshu
Shi Heida

Assignees

五十铃自动车株式会社

Dates

Publication Date: 20260508
Application Date: 20251024
Priority Date: 20241101

Claims (20)

1. An exhaust gas treatment device comprising: An exhaust pipe through which exhaust gas flows; an injection unit that injects urea water into the exhaust pipe; a first plate disposed upstream of the injection unit in the exhaust pipe so as to be orthogonal to an axial direction of the exhaust pipe; An arc-shaped second plate disposed in the exhaust pipe along the axial direction and facing the injection unit, and A third plate disposed downstream of the second plate in the exhaust pipe in a manner orthogonal to the axial direction, Wherein the first plate includes a first inflow hole formed at a position distant from a central portion of the first plate and a first guide portion configured to guide the exhaust gas introduced from the first inflow hole to the injection unit, and The third plate includes an outflow hole formed in a central portion of the third plate.
2. The exhaust gas treatment device according to claim 1, wherein, The first plate is a disk, and The first inflow hole is located at a position different from that of the second plate in a circumferential direction of the first plate when the first plate and the second plate are viewed from the third plate.
3. The exhaust gas treatment device according to claim 1, wherein, The injection unit is located at an upper end portion of the exhaust pipe in a vertical direction, and The first inflow hole is located at the same position as the outflow hole in the vertical direction.
4. The exhaust gas treatment device according to claim 3, wherein, The first inflow hole is a rectangular hole, and The first guide portion is disposed obliquely upward in the vertical direction from a lower edge of the first inflow hole.
5. The exhaust gas treatment device according to claim 3, wherein, The first plate is a disk, and The center of the first inflow hole is located farther from the center of the first plate than the outflow hole in the radial direction of the first plate.
6. The exhaust gas treatment device according to claim 1, wherein, The first plate is a disc having a first radius, The second plate has a semi-cylindrical shape, has a second radius smaller than the first radius, and One end of the second plate in the axial direction is in contact with the first plate.
7. The exhaust gas treatment device according to claim 6, wherein, The first plate further includes a plurality of second inflow holes disposed at predetermined intervals along the second plate, the plurality of second inflow holes being closer to a center of the first plate with respect to the second plate.
8. The exhaust gas treatment device according to claim 7, wherein, The second inflow hole is located at a position different from the position of the first inflow hole in the circumferential direction of the first plate.
9. The exhaust gas treatment device according to claim 6, wherein, The first plate further includes a third inflow hole provided along the second plate at a position closer to an edge of the first plate than the second plate.
10. The exhaust gas treatment device according to claim 1, wherein, The first plate further includes a second inflow hole formed at a position adjacent to an inner circumferential surface of the second plate and spaced apart from the first inflow hole by a predetermined angle in a circumferential direction.
11. The exhaust gas treatment device according to claim 10, wherein, The first plate further includes a second guide portion configured to guide the exhaust gas introduced from the second inflow hole toward the inner circumferential surface of the second plate.
12. The exhaust gas treatment device according to claim 11, wherein, The second inflow hole is a rectangular hole, and The second guide portion is disposed obliquely downward in a vertical direction from an upper edge of the second inflow hole.
13. The exhaust gas treatment device according to claim 1, wherein, The first plate further includes a fourth inflow hole formed in a circumferential direction at a position where the second plate is not provided, and the exhaust gas flows into the fourth inflow hole, and The fourth inflow hole is formed at a position adjacent to the injection unit in the circumferential direction.
14. The exhaust treatment device of claim 13, wherein, The second plate includes a curved portion formed at an end in the circumferential direction, and the curved portion is connected to the exhaust pipe, and The fourth inflow hole is located between the injection unit and the curved portion in the circumferential direction.
15. The exhaust gas treatment device according to claim 1, wherein, One end of the second plate in the axial direction is in contact with the first plate, and The other end of the second plate in the axial direction is in contact with the third plate.
16. An exhaust gas treatment device comprising: An exhaust pipe through which exhaust gas flows; an injection unit that injects urea water into the exhaust pipe; a first plate disposed upstream of the injection unit in the exhaust pipe so as to be orthogonal to an axial direction of the exhaust pipe; An arc-shaped second plate disposed in the exhaust pipe along the axial direction and facing the injection unit, and A third plate disposed downstream of the second plate in the exhaust pipe in a manner orthogonal to the axial direction, Wherein the first plate includes an inflow hole into which the exhaust gas flows, and The third plate includes i) a protruding portion protruding toward the first plate and ii) an outflow hole formed at a distal end of the protruding portion.
17. The exhaust treatment device of claim 16, wherein, The third plate further includes a flat plate portion disposed in a manner orthogonal to the axial direction, and The outer diameter of the protruding portion increases from the tip of the protruding portion toward the connection point with the flat plate portion.
18. The exhaust treatment device of claim 17, wherein, An outer peripheral surface of the protruding portion is curved from the tip of the protruding portion toward the connection point.
19. The exhaust treatment device of claim 16, wherein, The protruding portion is cylindrical in shape.
20. The exhaust treatment device of claim 16, wherein, The third plate is a disk, and The protruding portion protrudes from a central portion of the third plate toward the first plate.

Description

Exhaust gas treatment device Technical Field The present disclosure relates to an exhaust gas treatment device that purifies exhaust gas. Background Japanese unexamined patent application publication No. 2018-123788 discloses a technique in which urea water is injected from an injector toward an impactor provided in an exhaust passage through which exhaust gas flows, and the urea water adhering to the impactor is evaporated from the exhaust gas to generate ammonia gas. Disclosure of Invention Problems to be solved by the invention However, in the above-described technique, since the urea water injected by the injector tends to adhere to only a partial region of the impactor, it is difficult to effectively evaporate the urea water. The present disclosure focuses on this point and its purpose is to effectively evaporate the injected urea water. Means for solving the problems A first aspect of the present disclosure provides an exhaust gas treatment device including an exhaust pipe through which exhaust gas flows, an injection unit injecting urea water into the exhaust pipe, a first plate disposed upstream of the injection unit in the exhaust pipe in a manner orthogonal to an axial direction of the exhaust pipe, an arc-shaped second plate disposed in the exhaust pipe in the axial direction and facing the injection unit, and a third plate disposed downstream of the second plate in the exhaust pipe in a manner orthogonal to the axial direction, wherein the first plate includes a first inflow hole formed at a position distant from a central portion of the first plate and a first guide portion configured to guide exhaust gas introduced from the first inflow hole to the injection unit, and the third plate includes an outflow hole formed in a central portion of the third plate. Further, the first plate may be a disk, and the first inflow hole may be located at a position different from that of the second plate in the circumferential direction of the first plate when the first plate and the second plate are viewed from the third plate. Further, the injection unit may be located at an upper end portion of the exhaust pipe in the vertical direction, and the first inflow hole may be located at the same position as the outflow hole in the vertical direction. Further, the first inflow hole may be a rectangular hole, and the first guide portion may be disposed obliquely upward in a vertical direction from a lower edge of the first inflow hole. Further, the first plate may be a disk, and the center of the first inflow hole may be located farther from the center of the first plate than the outflow hole in the radial direction of the first plate. Further, the first plate may be a disk having a first radius, the second plate may have a semi-cylindrical shape having a second radius smaller than the first radius, and one end of the second plate in the axial direction may be in contact with the first plate. Further, the first plate may include a plurality of second inflow holes disposed at predetermined intervals along the second plate, the plurality of second inflow holes being closer to a center of the first plate with respect to the second plate. Further, the second inflow hole may be located at a position different from the position of the first inflow hole in the circumferential direction of the first plate. Further, the first plate may include a third inflow hole provided along the second plate, the third inflow hole being at a position closer to an edge of the first plate than the second plate. Further, the first plate may include a second inflow hole formed at a position adjacent to an inner circumferential surface of the second plate and spaced apart from the first inflow hole by a predetermined angle in a circumferential direction. Further, the first plate may further include a second guide portion configured to guide the exhaust gas introduced from the second inflow hole toward an inner circumferential surface of the second plate. Further, the second inflow hole may be a rectangular hole, and the second guide portion may be disposed obliquely downward in a vertical direction from an upper edge of the second inflow hole. Further, the first plate may include a fourth inflow hole formed at a position where the second plate is not disposed in the circumferential direction, and exhaust gas flows into the fourth inflow hole, and the fourth inflow hole may be formed at a position adjacent to the injection unit in the circumferential direction. Further, the second plate may include a curved portion formed at an end in the circumferential direction, and the curved portion is connected to the exhaust pipe, and the fourth inflow hole may be located between the injection unit and the curved portion in the circumferential direction. Further, one end of the second plate in the axial direction may be in contact with the first plate, and the other end of the second plate in the axial direction may be in contact with the third plate. A