Waste gas catalytic converter

Abstract

This invention provides an exhaust gas catalytic converter that enables exhaust gas to flow uniformly toward the catalyst. The exhaust gas catalytic converter includes: a catalyst, with an exhaust gas inlet portion at one end face for introducing exhaust gas; a catalyst housing for housing the catalyst; a curved member, with a first end connected to an exhaust gas outlet of a cylinder head and a second end connected to the catalyst housing, the curved member having a curved portion connecting the first end and the second end; and a baffle, at least located on the inner periphery of the curved portion, extending upstream of the end face relative to the end face, and protruding into the interior of the curved portion.

Description

Technical Field

[0001] This utility model relates to a catalytic device, and more particularly to a waste gas catalytic device. Background Technology

[0002] Since then, efforts have continued to mitigate climate change or reduce its impacts, and research and development related to exhaust gas catalytic converters are underway to achieve this goal. In the case of exhaust gas catalytic converters installed at the exhaust outlet of a vehicle engine, when the catalyst is installed at a downward-curving position of the exhaust outlet, exhaust gas tends to flow behind the catalyst, resulting in uneven exhaust gas flow to the catalyst and uneven temperature distribution on the catalyst, thereby reducing the exhaust gas purification performance and durability of the catalytic converter. In the prior art, various methods for achieving uniform contact between the gas and the catalyst are under investigation, and schemes to generate swirling or dispersed mainstreams to achieve uniform contact between the exhaust gas and the catalyst have been proposed.

[0003] For example, in the prior art, Patent Document 1 discloses a configuration in which the longitudinal airflow of exhaust gas is deflected forward and flows toward the catalyst via a protrusion. However, due to the arrangement of the cylinders, the exhaust gas is not necessarily introduced from the front of the curved portion of the exhaust gas catalytic converter, but is deflected due to the cylinder arrangement, leading to localized exhaust gas distribution. In Patent Document 2, a front wall is provided in front of the catalyst to reduce the exhaust gas flow rate and guide it in front of the catalyst, but the reduced flow rate makes it impossible to guide the exhaust gas behind the catalyst, thus the problem of controlling the exhaust gas flow remains.

[0004] This invention aims to address the aforementioned issues by controlling exhaust gas flow to ensure uniform contact between the exhaust gas and the catalyst. Furthermore, it contributes to mitigating climate change or reducing its impact.

[0005] [Existing Technical Documents]

[0006] [Patent Literature]

[0007] [Patent Document 1] Japanese Patent Publication No. 2007-211663

[0008] [Patent Document 2] Japanese Patent Publication No. 7590308 Utility Model Content

[0009] This invention relates to a waste gas catalytic device that enables waste gas to flow evenly toward the catalyst.

[0010] According to an embodiment of the present invention, the exhaust gas catalytic device includes: a catalyst, the end face of which is an exhaust gas inlet for introducing exhaust gas; a catalyst housing for housing the catalyst; a curved member, a first end of which is connected to an exhaust gas outlet of a cylinder head, a second end of which is connected to the catalyst housing, the curved member having a curved portion connecting the first end and the second end; and a baffle, at least located on the inner periphery of the curved portion, extending upstream of the end face from the curved member to a position relative to the end face, and protruding into the interior of the curved portion.

[0011] In an embodiment of the present invention, when viewed along a direction parallel to the end face, the top of the baffle is located between the midpoint between the upper end and the lower end of the exhaust gas outlet and the lower end.

[0012] In an embodiment of the present invention, the bending member includes an upstream member and a downstream member connected to each other, the upstream member extending from the first end to a position relative to the first end, the downstream member extending from the second end to a position relative to the end face, and at least the inner periphery of the upper end of the downstream member extending to form the baffle.

[0013] In an embodiment of the present invention, the upper end of the downstream member is a straight cylindrical portion, and the downstream side of the downstream member has an expansion portion that expands in the direction toward the catalyst.

[0014] In an embodiment of the present invention, the upstream component has a sensor mounting portion for mounting an exhaust gas sensor. The sensor mounting portion is located on the outer periphery of the curved portion and is positioned relative to the end face. The sensing portion of the exhaust gas sensor is closer to the outer periphery of the curved portion than the baffle.

[0015] In an embodiment of the present invention, the upper end of the downstream component extends integrally to form the baffle, and when viewed along a direction perpendicular to the end face, the sensor mounting portion is located within the range of the upper end of the downstream component.

[0016] In an embodiment of the present invention, the downstream end of the upstream member has a plurality of protrusions that protrude outward from opposite sides of the first end and are arranged along the cylinder arrangement direction of the cylinder head.

[0017] Based on the above, in the exhaust gas catalytic converter of this invention, by providing a baffle protruding into the exhaust gas flow path from the inner periphery of the curved section, a vortex-like rotating airflow flowing inward towards the inner periphery can be formed downstream of the baffle, thereby guiding the exhaust gas towards the front of the catalyst. Furthermore, by providing a baffle at the inner periphery of the curved section, a gap is formed that allows the exhaust gas to flow along the outer periphery of the curved section towards the rear of the catalyst, thus guiding the exhaust gas to the rear of the catalyst without reducing the exhaust gas flow velocity towards the rear of the catalyst. In this way, the exhaust gas flows uniformly towards the catalyst, resulting in a uniform temperature distribution on the catalyst, thereby enabling the catalyst to effectively purify the exhaust gas and prevent localized degradation due to uneven temperature. Attached Figure Description

[0018] Figure 1 This is a top view schematic diagram of the exhaust gas catalytic converter connected to the exhaust gas outlet of the engine body according to an embodiment of the present invention.

[0019] Figure 2 yes Figure 1 A three-dimensional view of the waste gas catalytic converter;

[0020] Figure 3 yes Figure 2 A schematic diagram of the internal cross-section of the exhaust gas catalytic converter;

[0021] Figure 4 This is a perspective view of a waste gas catalytic device according to another embodiment of the present invention;

[0022] Figure 5 yes Figure 4 A top-view schematic diagram of the flow direction of exhaust gas in the exhaust gas catalytic converter.

[0023] Explanation of icon numbers

[0024] 10: Engine body;

[0025] 11: Cylinder;

[0026] 12: Cylinder head;

[0027] 12a: Exhaust gas outlet;

[0028] 100, 100A: Exhaust gas catalytic converter;

[0029] 110: Catalyst;

[0030] 110a: End face;

[0031] 1101: Front part;

[0032] 1102: Rear section;

[0033] 111: Catalyst shell;

[0034] 111a: Catalyst;

[0035] 120: Catalyst shell;

[0036] 121: Flange;

[0037] 122: Reduction section;

[0038] 130: Bending member;

[0039] 130a: First end;

[0040] 130b: Second end;

[0041] 130c: Bending section;

[0042] 1301: Inner circumference;

[0043] 132: Upstream component;

[0044] 1321: Flange;

[0045] 1322: Sensor mounting section;

[0046] 1323: Exhaust gas sensor;

[0047] 1323a: Sensing unit;

[0048] 1324: Protrusion;

[0049] 134: Downstream component;

[0050] 1341: Expansion section;

[0051] 1342, E2: Upper end;

[0052] C: Midpoint;

[0053] D1, D2, D3: Direction;

[0054] E1: Top;

[0055] E3: Bottom end;

[0056] EP: Exhaust gas passage;

[0057] EX: Exhaust gas outlet;

[0058] F, F1, F2: Exhaust gas;

[0059] P: Baffle. Detailed Implementation

[0060] Reference will now be made in detail to exemplary embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same component reference numerals are used in the drawings and description to denote the same or similar parts.

[0061] Figure 1 This is a top view schematic diagram of the exhaust gas catalytic converter connected to the exhaust gas outlet of the engine body according to an embodiment of this utility model. Please refer to it. Figure 1 In this embodiment, the exhaust gas catalytic converter 100 is used to purify the exhaust gas F from the engine block 10 of the vehicle. Specifically, the exhaust gas catalytic converter 100 is connected to the exhaust gas outlet EX of the exhaust gas passage EP of the cylinder head 12 of the engine block 10. The exhaust gas passage EP is connected to the exhaust gas ports 12a of the cylinder head 12, which correspond to a plurality of cylinders 11 of the engine block 10. The exhaust gas F from the cylinders 11 reaches the exhaust gas catalytic converter 100 through the exhaust gas passage EP.

[0062] Figure 2 yes Figure 1 A three-dimensional view of the waste gas catalytic converter. Figure 3 yes Figure 2 This is a schematic diagram of the internal cross-section of the exhaust gas catalytic converter. Please refer to it. Figure 2 and Figure 3 The exhaust gas catalytic converter 100 of this embodiment includes a catalyst 110, a catalyst housing 120, and a bent member 130. The end face 110a of the catalyst 110 is an exhaust gas inlet for introducing exhaust gas F from the engine body 10. The catalyst housing 120 is used to house the catalyst 110. The first end face 130a of the bent member 130 passes through… Figure 1 The flange 1321 shown is connected to the exhaust outlet EX of the exhaust passage EP of the cylinder head 12. The flange 1321 is integrally connected, for example, to the first end 130a of the bent member 130. The second end 130b of the bent member 130 is connected to the catalyst housing 120. The bent member 130 has a bend 130c, which connects the first end 130a and the second end 130c at a predetermined angle. The predetermined angle may be as follows: Figure 3 The angle shown is roughly a right angle, but this utility model is not limited to this; it can be an acute angle or an obtuse angle.

[0063] Please refer to Figure 3 The exhaust gas catalytic device 100 of this embodiment also includes a baffle P. The baffle P is located at least in the inner peripheral portion 1301 of the curved portion 130c. The baffle P extends along a direction D1 upstream of the end face 110a of the catalyst 110 towards the curved member 130 to a position relative to the end face 110a, and protrudes into the interior of the curved portion 130c.

[0064] As described above, in the exhaust gas catalytic converter 100 of this embodiment, by providing a baffle P protruding into the exhaust gas flow path from the inner circumferential portion 1301 of the bend 130c, a vortex-like rotating airflow (exhaust gas F1) flowing inward toward the inner circumferential side can be formed downstream of the baffle P, thereby guiding the exhaust gas F1 toward the front portion 1101 of the catalyst 110. Furthermore, by providing the baffle P on the inner circumferential portion of the bend 130c, a gap is formed that allows the exhaust gas F2 to flow along the outer circumferential portion 1302 of the bend 130c toward the rear portion 1102 of the catalyst 110. This allows the exhaust gas F2 to be guided to the rear portion 1102 of the catalyst 110 without reducing the exhaust gas flow rate toward the rear portion 1102 of the catalyst 110. In this way, the exhaust gas F flows uniformly toward the catalyst 110, resulting in a uniform temperature distribution on the catalyst 110. This allows the catalyst 110 to effectively purify the exhaust gas F and prevent localized degradation due to uneven temperature.

[0065] Please refer to Figure 3 In this embodiment, when viewed along a direction parallel to the end face 110a of the catalyst 110, the top end E1 of the baffle P is located at the exhaust outlet EX (indicated by...). Figure 1 The upper end E2 and exhaust outlet EX (marked at) Figure 1 The baffle P is located between the midpoint C of the lower end E3 and the lower end E3. With this configuration, the baffle P is located below the midpoint C of the exhaust outlet EX, thereby creating sufficient space above the midpoint C for the exhaust gas F2 to flow through this space to the rear part 1102 of the catalyst 110. This allows the exhaust gas F2 to be guided to the rear part 1102 of the catalyst 110 without reducing the flow rate of the exhaust gas F2 in the rear part 1102 of the catalyst 110.

[0066] The curved member 130 of this embodiment includes an upstream member 132 and a downstream member 134 connected to each other. The upstream member 132 extends from a first end 130a of the curved member 130 to a position relative to the first end 130a, and the downstream member 134 extends from a second end 130b of the curved member 130 to a position relative to the end face 110a of the catalyst 110. At least the inner circumference 1301 of the upper end 1342 of the downstream member 134 extends in direction D1 to form a baffle P. With this arrangement, the baffle P is formed by extending the existing downstream member 134, so there is no need to provide an additional member to form the baffle P, which simplifies the structure and assembly of the exhaust gas catalytic converter 100.

[0067] Specifically, in this embodiment, the upper end 1342 of the downstream component 134 is a straight cylindrical portion, and the entire circumference of the upper end 1342 of the downstream component 134 extends along direction D1 to form a baffle P. With this arrangement, the baffle P can be formed by extending the upper end 1342 of the downstream component 134 upwards, which has a simpler structure and process than forming the baffle P only in the inner circumference 1301 of the upper end 1342 of the downstream component 134, thus saving manufacturing costs.

[0068] Furthermore, in this embodiment, the downstream component 134 has an expansion portion 1341 on its downstream side, which expands in the direction toward the catalyst 110. By providing the expansion portion 1341 on the downstream side of the downstream component 134, the diffusion of the rotating airflow (exhaust gas F1) in the downstream component 134 can be prevented, reducing the effect of entraining exhaust gas. Moreover, by allowing the exhaust gas to flow along the expansion portion 1341, the exhaust gas can be uniformly guided to the front portion 1101 and the rear portion 1102 of the catalyst 110.

[0069] like Figure 3 As shown, in this embodiment, the upstream member 132 has a sensor mounting portion 1322 for mounting an exhaust gas sensor 1323. The sensor mounting portion 1322 is located on the outer periphery 1302 of the curved portion 130c and is positioned relative to the end face 110a of the catalyst 110. The sensing portion 1323a of the exhaust gas sensor 1323 is closer to the outer periphery 1302 of the curved portion 130c than the baffle P. Accordingly, a stable airflow (exhaust gas F2) unaffected by the rotating airflow (exhaust gas F1) can impact the sensing portion 1323a of the exhaust gas sensor 1323, thereby preventing a decrease in the sensing accuracy of the exhaust gas sensor 1323 while the baffle P guides the exhaust gas F1 to the front portion 1101 of the catalyst 110 through the rotating airflow.

[0070] In this embodiment, when viewed along direction D2 perpendicular to the end face 110a of the catalyst 110, the sensor mounting portion 1322 is located within the range of the upper end 1342 of the downstream member 134. With this arrangement, the sensor mounting portion 1322 does not approach the inner wall of the curved member 130, thus ensuring that the airflow (exhaust gas F2) flowing through the sensor mounting portion 1322 is a stable airflow rather than an excessively fast airflow at the wall, thereby guaranteeing good sensing accuracy for the sensor mounting portion 1322.

[0071] Figure 4 This is a perspective view of a waste gas catalytic device according to another embodiment of the present invention. Figure 5 yes Figure 4 A top-view schematic diagram of the flow direction of exhaust gas in the exhaust gas catalytic converter. Figure 4 The exhaust gas catalytic converter 100A of the embodiment shown is Figure 2The difference in the exhaust gas catalytic converter 100 of the illustrated embodiment is that the downstream end of the upstream member 132 of the exhaust gas catalytic converter 100A has a plurality of protrusions 1324. The plurality of protrusions 1324 protrude outwards from opposite sides of the first end 130a, and the plurality of protrusions 1324 extend along the cylinder head 12 (shown in…). Figure 1 The cylinder arrangement direction D3 is set. Thus, as... Figure 5 As shown, by providing a protrusion 1324 at the downstream end of the upstream component 132 along the cylinder arrangement direction D3, the exhaust gas F flowing through the upstream component 132 near the outer and inner sides can be respectively guided into the protrusion 150, thereby promoting the exhaust gas F to flow towards the center. In this way, the exhaust gas F can flow evenly to the catalyst 110, resulting in a uniform temperature distribution of the catalyst 110, thereby enabling the catalyst 110 to effectively purify the exhaust gas and prevent localized deterioration caused by uneven temperature.

[0072] In summary, in the exhaust gas catalytic converter of this invention, by providing a baffle protruding into the exhaust gas flow path from the inner periphery of the curved section, a vortex-like rotating airflow flowing inward towards the inner periphery can be formed downstream of the baffle, guiding the exhaust gas towards the front of the catalyst. Furthermore, by providing a baffle on the inner periphery of the curved section, a gap is formed that allows the exhaust gas to flow along the outer periphery of the curved section towards the rear of the catalyst, thus guiding the exhaust gas to the rear of the catalyst without reducing the exhaust gas flow velocity towards the rear of the catalyst. This allows the exhaust gas to flow uniformly towards the catalyst, resulting in a uniform temperature distribution on the catalyst, thereby enabling the catalyst to effectively purify the exhaust gas and prevent localized degradation caused by uneven temperature.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. An exhaust gas catalytic device characterized by, include: A catalyst, wherein the end face of the catalyst is used as an exhaust gas inlet for introducing exhaust gas; A catalyst housing for containing the catalyst; A bending member, wherein a first end of the bending member is connected to the exhaust outlet of the cylinder head, and a second end of the bending member is connected to the catalyst housing, the bending member having a bending portion that connects the first end and the second end; as well as A baffle, at least located on the inner periphery of the bend, extends upstream of the end face toward the bend member to a position relative to the end face and protrudes into the interior of the bend.

2. The waste gas catalytic converter according to claim 1, characterized in that, When viewed along a direction parallel to the end face, the top of the baffle is located between the midpoint between the upper end and the lower end of the exhaust gas outlet and the lower end.

3. The waste gas catalytic device according to claim 1, characterized in that, The bending member includes an upstream member and a downstream member connected to each other. The upstream member extends from the first end to a position relative to the first end, and the downstream member extends from the second end to a position relative to the end face. At least the inner periphery of the upper end of the downstream component extends to form the baffle.

4. The waste gas catalytic device according to claim 3, characterized in that, The upper end of the downstream component is a straight cylindrical portion, and the downstream side of the downstream component has an expansion portion that expands in the direction toward the catalyst.

5. The waste gas catalytic device according to claim 3, characterized in that, The upstream component has a sensor mounting portion for mounting an exhaust gas sensor. The sensor mounting portion is located on the outer periphery of the bend and at a position relative to the end face. The sensing portion of the exhaust gas sensor is closer to the outer periphery of the bend than the baffle.

6. The waste gas catalytic converter according to claim 5, characterized in that, The baffle is formed by the overall extension of the upper end of the downstream component. When viewed along a direction perpendicular to the end face, the sensor mounting portion is located within the range of the upper end of the downstream component.

7. The waste gas catalytic device according to claim 3, characterized in that, The downstream end of the upstream component has a plurality of protrusions that protrude outward from opposite sides of the first end and are arranged along the cylinder arrangement direction of the cylinder head.

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