Exhaust assembly and exhaust aftertreatment device

Abstract

The invention belongs to the technical field of tail gas after-treatment, and particularly relates to an exhaust assembly and an exhaust after-treatment device. The exhaust assembly comprises a pipe wall type end cover, a spoiler and an air inlet pipe, the pipe wall type end cover is provided with an air inlet and a connecting port, the inlet end of the air inlet pipe is connected with an exhaust flange of an engine through an air inlet flange, and the outlet end of the air inlet pipe is connected to the air inlet of the pipe wall type end cover; the spoiler comprises a spoiler part and a connecting part, the spoiler is connected to the pipe wall type end cover and the air inlet pipe through the connecting part, and an included angle alpha ranging from 45 degrees to 75 degrees is formed between the spoiler part and the plane where the air inlet flange is located. According to the exhaust aftertreatment device, the pipe wall type end cover, the spoiler, the integral clamshell assembly and the integral silencing bag are introduced, the pipe wall type end cover and the spoiler work cooperatively, the uniformity of airflow is greatly improved, the volume of an air outlet cavity is ingeniously increased through the integral clamshell assembly, and air is exhausted more smoothly; and the integral silencing bag effectively reduces noise generated by gas emission.

Description

Technical Field

[0001] The present invention belongs to the technical field of exhaust gas aftertreatment, and particularly relates to an exhaust assembly and an exhaust gas aftertreatment device. Background Art

[0002] With the enhancement of environmental awareness and the implementation of environmental protection policies, the requirements for the exhaust gas aftertreatment system of automobiles are getting higher and higher. To meet the increasingly strict emission standards, the aftertreatment system needs to be continuously upgraded. Moreover, the "price war" in the current automotive market is particularly fierce, and both traditional fuel vehicles and emerging new energy vehicles have reduced their prices. This has led to a decline in the profits of automobile manufacturers. To maintain competitiveness, it is necessary to reduce costs to maintain a certain profit margin. Under the premise of meeting the standards, changing the box-type structure of the aftertreatment to a cylindrical structure has become an important way, which can ensure that enterprises maintain economic benefits while meeting environmental protection compliance. Although the CNG box-type aftertreatment structure used in the current market has a relatively regular structure and relatively good performance, this kind of aftertreatment structure is often relatively heavy and costly. In the current automotive market where the "price war" is particularly fierce, it cannot meet the requirements of customers, and customers often choose other product structures with more optimal costs.

[0003] Currently, in the automotive aftertreatment system, the box-type outer shape structure is widely used in the market. The advantage of this structure is its high degree of platformization, which can adapt to many conventional vehicle models and performs excellently in terms of versatility. However, the box-type structure also has obvious drawbacks. Its outer shape is relatively large, which to a certain extent increases the space occupation cost of the vehicle. Currently, the "price war" in the automotive market is extremely fierce, and both traditional fuel vehicles and booming new energy vehicles have joined the price reduction ranks. In such a market environment, in order to maintain their own market competitiveness, major automobile manufacturers must reduce costs to maintain a certain profit margin. And the structural optimization of the aftertreatment system is exactly one of the important directions to achieve cost reduction. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies existing in the prior art and provide an exhaust assembly and an exhaust gas aftertreatment device. The present invention provides a cylindrical exhaust gas aftertreatment device with a simple structure, convenient installation, lighter weight, and smaller occupied space, which can reduce the cost of automotive aftertreatment products, enable enterprises to launch products at a more competitive price, attract more customers, expand the market share, and promote the sustainable development of enterprises.

[0005] To achieve the above technical purposes, the technical solutions adopted in the embodiments of the present invention are as follows: In a first aspect, an embodiment of the present invention provides an exhaust assembly, including a pipe wall type end cover, a spoiler, and an intake pipe. The pipe wall type end cover has an air inlet and a connection port. The inlet end of the intake pipe is connected to the exhaust flange of the engine through an intake flange, and the outlet end of the intake pipe is connected to the air inlet of the pipe wall type end cover. The spoiler includes a spoiler part and a connecting part. The spoiler is connected to the pipe wall type end cover and the intake pipe through the connecting part. An included angle α of 45° - 75° is formed between the spoiler part and the plane where the intake flange is located. The length L of the spoiler in the horizontal direction satisfies L ≤ 2 / 3d, where d is the diameter of the intake pipe.

[0006] Further, the spoiler part is bow-shaped. The connecting part includes a first connecting part, a second connecting part, and a third connecting part. The first connecting part and the second connecting part are both arranged on the arc edge of the spoiler part. The second connecting part is located between the spaced first connecting parts. The third connecting part is arranged at the free end of the second connecting part. Both the first connecting part and the third connecting part are flanges. The first connecting part is connected to the pipe wall type end cover, and the third connecting part is connected to the intake pipe.

[0007] Further, the distance H between the top end of the third connecting part and the intake flange is 90 - 160 mm.

[0008] Further, a notch part is provided at the lower end of the intake pipe. The third connecting part is connected to the intake pipe opposite to the notch part. The height A of the intake pipe above the notch part is A = 90 - 110 mm.

[0009] Further, the connection port is located at one end of the pipe wall type end cover. The air inlet is located on the side wall and the end face of the pipe wall type end cover. The axis of the intake pipe is arranged perpendicular to the axis of the pipe wall type end cover.

[0010] In a second aspect, an embodiment of the present invention provides an exhaust after-treatment device, including an integral clam shell assembly and the exhaust assembly described in the first aspect. A circular cylinder is arranged between the exhaust assembly and the integral clam shell assembly. The inlet end of the circular cylinder is connected to the connection port of the pipe wall type end cover. A catalyst is arranged inside the circular cylinder. The outlet end of the circular cylinder is connected to the inlet of the integral clam shell assembly. The outlet of the integral clam shell assembly is connected to the inlet of a hole pipe. An outlet flange is provided at the outlet of the hole pipe. A straight pipe is sleeved outside the hole pipe, and a needle felt type fiber cotton is arranged between the straight pipe and the hole pipe.

[0011] Further, needle felt type fiber cotton is filled between the catalyst and the inner wall of the circular cylinder. The catalyst includes a first catalyst and a second catalyst, and there is a gap with a distance C between the first catalyst and the second catalyst, where C = 10 - 40 mm.

[0012] Furthermore, there is a gap with a distance B between the chord edge of the spoiler and the inlet end of the circular cylinder, where B = 40 - 70 mm; a reinforcing patch is provided at the connection between the inlet pipe and the circular cylinder.

[0013] Furthermore, the inlet and outlet of the integral clam shell assembly are arranged on the same end face, and the distance between the inlet and the outlet is 260 - 320 mm. The integral clam shell assembly has a cavity with a length D in the horizontal direction, where D = 110 - 130 mm.

[0014] Furthermore, air outlet holes are evenly arranged in the middle part of the hole pipe, the straight pipe completely covers the air outlet holes, and a hole-free area with a distance E is formed between the air outlet end of the integral clam shell assembly and the air outlet holes, where E = 50 - 70 mm; The distance between one end of the straight pipe close to the air outlet flange and the air outlet flange is ≥ 40 mm; The difference between the diameter of the straight pipe and the diameter of the hole pipe is ≥ 20 mm, and the outer diameter of the straight pipe is ≤ 160 mm.

[0015] The beneficial effects brought by the technical solution provided by the embodiment of the present invention are as follows: (1) The present invention provides an innovative post-treatment pipe wall type gas mixing structure. The uniqueness of this structure lies in the adoption of a pipe wall type end cover and a spoiler structure. The pipe wall type end cover can optimize the path of gas entering the post-treatment device, and the spoiler plays a role in disturbing and mixing the air flow. The two work together to greatly enhance the uniformity of the air flow.

[0016] (2) The exhaust post-treatment device of the present invention introduces an integral clam shell assembly at the air outlet end and an integral silencer package: the integral clam shell assembly ingeniously increases the volume of the air outlet cavity, making the gas discharge more smooth; and the integral silencer package further plays a role in effectively reducing the noise generated by gas emissions.

[0017] (3) The exhaust post-treatment device of the present invention significantly reduces the volume and mass of the entire post-treatment structure, reduces costs, improves product competitiveness, and enables the post-treatment to be applicable to more stringent boundary conditions, providing a strong guarantee for the post-treatment to adapt to the vehicle boundary, and at the same time achieving a significant cost reduction effect.

[0018] (4) The exhaust post-treatment device of the present invention has a simple and practical structure. While taking into account the requirement of air flow uniformity in the post-treatment, it can also reduce air flow noise.

[0019] (5) The exhaust aftertreatment device of the present invention breaks the original box structure and changes to a more compact cylinder structure; the square end cap on the intake side in the box structure is changed to a round end cap to reduce product cost; the square end cap on the outlet side in the box structure is changed to a clam shell structure, making the space on the outlet side larger, increasing the outlet side volume, reducing noise, and improving driving comfort; the design of a spoiler is added to enhance the air flow uniformity; a sound absorption structure of an integral muffler pack is added to the cylinder structure to reduce noise and improve driving comfort. Description of the Drawings

[0020] Figure 1 It is a schematic structural diagram of the exhaust aftertreatment device in an embodiment of the present invention.

[0021] Figure 2 is Figure 1 Schematic structural diagram of the intake end of the exhaust aftertreatment device.

[0022] Figure 3 is Figure 1 Schematic structural diagram of the outlet end of the exhaust aftertreatment device.

[0023] Figure 4 It is a schematic structural diagram of the intake pipe in the exhaust assembly.

[0024] Figure 5 It is a schematic structural diagram of the pipe wall type end cap in the exhaust assembly.

[0025] Figure 6 It is a schematic structural diagram of the spoiler in the exhaust assembly.

[0026] Figure 7 is Figure 1 Schematic structural diagram of the integral clam shell assembly and its outlet end in the exhaust aftertreatment device.

[0027] Description of the reference numerals: 1 - pipe wall type end cap; 2 - intake flange; 3 - spoiler; 4 - intake pipe; 5 - reinforcement patch; 6 - catalyst; 7 - circular cylinder; 8 - integral clam shell assembly; 9 - hole pipe; 10 - needle felt type fiber cotton; 11 - straight pipe; 12 - outlet flange; 1A - intake port; 1B - connection port; 31 - spoiler part; 32 - connection part; 321 - first connection part; 322 - second connection part; 323 - third connection part; 41 - notch part; 61 - first catalyst; 62 - second catalyst; 91 - air outlet hole. Detailed Embodiments

[0028] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by orientation words such as "inside, outside", "up, down", "left, right", etc. is usually based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description. Without contrary explanation, these orientation words do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the protection scope of the present invention.

[0029] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0030] Embodiment 1 As Figures 4 - 6 shown, an exhaust assembly includes a tube-wall type end cover 1, a spoiler 3 and an intake pipe 4. The tube-wall type end cover 1 has an air inlet 1A and a connection port 1B. The inlet end of the intake pipe 4 is connected to the exhaust flange of the engine through an intake flange 2, and the outlet end of the intake pipe 4 is connected to the air inlet 1A of the tube-wall type end cover 1. The spoiler 3 includes a spoiler portion 31 and a connection portion 32. The spoiler 3 is connected to the tube-wall type end cover 1 and the intake pipe 4 through the connection portion 32. An included angle α of 45° - 75° is formed between the spoiler portion 31 and the plane where the intake flange 2 is located. The length L of the spoiler 3 in the horizontal direction satisfies L ≤ 2 / 3d, where d is the diameter of the intake pipe 4.

[0031] The spoiler portion 31 is bow-shaped; The connection portion 32 includes a first connection portion 321, a second connection portion 322 and a third connection portion 323. Both the first connection portion 321 and the second connection portion 322 are provided on the arc edge of the spoiler portion 31. The second connection portion 322 is located between the spaced first connection portions 321. The third connection portion 323 is provided at the free end of the second connection portion 322. Both the first connection portion 321 and the third connection portion 323 are flanges. The first connection portion 321 is connected to the tube-wall type end cover 1, and the third connection portion 323 is connected to the intake pipe 4.

[0032] The distance H between the top end of the third connection portion 323 and the intake flange 2 is 90 - 160 mm.

[0033] A notch portion 41 is provided at the lower end of the intake pipe 4. The third connection portion 323 is connected to the intake pipe 4 opposite to the notch portion 41. The height of the intake pipe 4 at the top of the notch portion 41 is A, and A = 90 - 110 mm. As an implementation manner, A = 100 mm.

[0034] The connection port 1B is located at one end of the pipe wall type end cover 1, the air inlet 1A is located on the side wall and the end face of the pipe wall type end cover 1, and the axis of the intake pipe 4 is perpendicular to the axis of the pipe wall type end cover 1.

[0035] Embodiment 2 As Figures 1 - 3 shown, an exhaust aftertreatment device includes an integral clam shell assembly 8 and the exhaust assembly in Embodiment 1. A circular cylinder 7 is arranged between the exhaust assembly and the integral clam shell assembly 8. The inlet end of the circular cylinder 7 is connected to the connection port 1B of the pipe wall type end cover 1. A catalyst 6 is arranged inside the circular cylinder 7. The outlet end of the circular cylinder 7 is connected to the inlet of the integral clam shell assembly 8. The inlet of the connection hole pipe 9 at the outlet of the integral clam shell assembly 8. An air outlet flange 12 is arranged at the outlet of the hole pipe 9. A straight pipe 11 is sleeved outside the hole pipe 9, and a needle felt type fiber cotton 10 is arranged between the straight pipe 11 and the hole pipe 9.

[0036] Needle felt type fiber cotton 10 is filled between the catalyst 6 and the inner wall of the circular cylinder 7; The catalyst 6 includes a first catalyst 61 and a second catalyst 62. There is a gap C with a distance of 10 - 40 mm between the first catalyst 61 and the second catalyst 62. As an implementation manner, C = 40 mm; There is a gap B with a distance of 40 - 70 mm between the chord edge of the flow disturbing part 31 and the inlet end of the circular cylinder 7. As an implementation manner, B = 60 mm; A reinforcing patch 5 is arranged at the connection part of the intake pipe 4 and the circular cylinder 7.

[0037] As Figure 7 shown, the inlet and the outlet of the integral clam shell assembly 8 are arranged on the same end face. The distance between the inlet and the outlet is 260 - 320 mm. As an implementation manner, the distance is 290 mm. The integral clam shell assembly 8 has a cavity with a length of D in the horizontal direction, D = 110 - 130 mm. As an implementation manner, D = 120 mm.

[0038] Air outlet holes 91 are evenly arranged in the middle part of the hole pipe 9. The straight pipe 11 completely covers the air outlet holes 91, and a non - hole area with a distance of E is formed between the air outlet end of the integral clam shell assembly 8 and the air outlet holes 91. E = 50 - 70 mm. As an implementation manner, E = 60 mm; The distance between one end of the straight pipe 11 close to the air outlet flange 12 and the air outlet flange 12 is ≥ 40 mm; The difference between the diameter of the straight pipe 11 and the diameter of the hole pipe 9 is ≥ 20 mm, and the outer diameter of the straight pipe 11 is ≤ 160 mm.

[0039] The tube wall type end cover 1 of the exhaust aftertreatment device of the present invention replaces the original intake square end cover, and the integral clam shell assembly 8 replaces the original outlet square end cover. The square partition inside the original box type scheme is cancelled, and a spoiler 3 is added. Its main function is to shunt the tail gas, thereby ensuring the uniformity of the air flow. When designing the spoiler of the present invention, the opening angle α of the spoiler is considered. It directly determines the direction of the spoiler and has a key impact on the tail gas shunting effect. Secondly, it is the distance H between the spoiler and the intake flange. This parameter plays an important role in the rebound mixing of the air flow. A reasonable distance can make the air flow mix more fully. In addition, the design of the integral clam shell assembly 8 increases the volume of the outlet cavity. Together with the 9-hole tube, 10 needle felt type fiber cotton and 11 straight tubes, it can effectively improve the sound absorption ability of the product and optimize the product performance in many aspects.

[0040] During use, the intake pipe 4 is connected to the exhaust flange of the engine through the intake flange 2. The engine tail gas enters the aftertreatment system through the intake pipe 4, playing a role of disturbing and mixing. A part of the air flow V1 directly enters the cavity A through the spoiler 3; a part of the air flow V2 is guided by the arc surface of the tube wall type end cover 1 to flow to the lower cavity B of the spoiler 3. Then the air flows V1 and V2 are mixed before passing through the catalyst, improving the uniformity of the flow field, and then flowing to the catalyst 6. A distance C is increased between the first catalyst 61 and the second catalyst 62, so that the tail gas flows through the catalyst more evenly, improving the uniformity of the flow field, and the resistance when the air flow flows between the first catalyst 61 and the second catalyst 62 can be reduced, reducing the pressure loss of the entire aftertreatment system. The air flow enters the cavity D after passing through the catalyst, making the gas mix more fully and evenly. And the larger volume of the outlet cavity can play a buffering role, alleviating the pulsation of the air flow, reducing the instability and impact of the air flow, and thus reducing the noise generated by the air flow pulsation. Then the air flow enters the cavity E, and the noise intensity is further reduced under the combined action of the silencing pipe and the sound-absorbing cotton.

[0041] The exhaust aftertreatment device in the embodiment of the present invention adopts a side intake and gas mixing structure, which can reduce the use of the side intake hole pipe and shorten the original mixing distance; on the basis of replacing the original structure, it can also shorten the overall structure length of the aftertreatment; adding a new spoiler design to ensure the uniformity of the air flow. Compared with the original design, this cylindrical structure not only reduces the noise, but also can reduce the weight of the aftertreatment, reduce the product cost, and play a role in reducing costs and increasing efficiency. The structure of the exhaust aftertreatment device of the present invention is relatively small in overall volume compared with the original structure and can be applied to more installation schemes of aftertreatment.

[0042] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the examples, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. An exhaust assembly, characterized in that, It includes a pipe wall type end cover (1), a spoiler (3) and an intake pipe (4). The pipe wall type end cover (1) has an air inlet (1A) and a connection port (1B). The inlet end of the intake pipe (4) is connected to the exhaust flange of the engine through an intake flange (2), and the outlet end of the intake pipe (4) is connected to the air inlet (1A) of the pipe wall type end cover (1). The spoiler (3) includes a spoiler part (31) and a connection part (32). The spoiler (3) is connected to the pipe wall type end cover (1) and the intake pipe (4) through the connection part (32). An angle α of 45° - 75° is formed between the spoiler part (31) and the plane where the intake flange (2) is located. The length L of the spoiler (3) in the horizontal direction satisfies L ≤ 2 / 3d, where d is the diameter of the intake pipe (4).

2. The exhaust assembly according to claim 1, wherein The spoiler part (31) is bow-shaped; The connection part (32) includes a first connection part (321), a second connection part (322) and a third connection part (323). The first connection part (321) and the second connection part (322) are both arranged on the arc edge of the spoiler part (31). The second connection part (322) is located between the spaced first connection parts (321). The third connection part (323) is arranged at the free end of the second connection part (322). Both the first connection part (321) and the third connection part (323) are flanges. The first connection part (321) is connected to the pipe wall type end cover (1), and the third connection part (323) is connected to the intake pipe (4).

3. The exhaust assembly according to claim 2, wherein, The distance H between the top end of the third connection part (323) and the intake flange (2) is 90 - 160 mm.

4. The exhaust assembly according to claim 2, characterized in that, A notch part (41) is provided at the lower end of the intake pipe (4). The third connection part (323) is connected to the intake pipe (4) opposite to the notch part (41). The height of the intake pipe (4) above the notch part (41) is A, and A = 90 - 110 mm.

5. The exhaust assembly according to claim 1, wherein The connection port (1B) is located at one end of the pipe wall type end cover (1). The air inlet (1A) is located on the side wall and the end face of the pipe wall type end cover (1). The axis of the intake pipe (4) is perpendicular to the axis of the pipe wall type end cover (1).

6. An exhaust aftertreatment device, characterized in that, It includes an integral clam shell assembly (8) and the exhaust assembly according to any one of claims 1 - 5. A circular cylinder (7) is provided between the exhaust assembly and the integral clam shell assembly (8). The inlet end of the circular cylinder (7) is connected to the connection port (1B) of the pipe wall type end cover (1). A catalyst (6) is provided inside the circular cylinder (7). The outlet end of the circular cylinder (7) is connected to the inlet of the integral clam shell assembly (8). The outlet of the integral clam shell assembly (8) is connected to the inlet of a hole pipe (9). An outlet flange (12) is provided at the outlet of the hole pipe (9). A straight pipe (11) is sleeved outside the hole pipe (9). A needle felt type fiber cotton (10) is provided between the straight pipe (11) and the hole pipe (9).

7. The exhaust gas aftertreatment device according to claim 6, characterized in that, Needle felt type fiber cotton (10) is filled between the inner wall of the catalyst (6) and the inner wall of the circular cylinder (7); The catalyst (6) includes a first catalyst (61) and a second catalyst (62), and there is a gap with a distance C between the first catalyst (61) and the second catalyst (62), C = 10 - 40 mm.

8. The exhaust gas aftertreatment device according to claim 6, characterized in that, There is a gap with a distance B between the chord edge of the flow disturbing part (31) and the inlet end of the circular cylinder (7), B = 40 - 70 mm; A reinforcing patch (5) is provided at the connection between the inlet pipe (4) and the circular cylinder (7).

9. The exhaust gas aftertreatment device according to claim 6, wherein The inlet and outlet of the integral clam shell assembly (8) are arranged on the same end face, and the distance between the inlet and the outlet is 260 - 320 mm. The integral clam shell assembly (8) has a cavity with a length of D in the horizontal direction, D = 110 - 130 mm.

10. The exhaust gas aftertreatment device according to claim 6, characterized in that, Air outlet holes (91) are evenly arranged in the middle part of the hole pipe (9). The straight pipe (11) completely covers the air outlet holes (91), and a pore-free area with a distance of E is formed between the air outlet end of the integral clam shell assembly (8) and the air outlet holes (91), E = 50 - 70 mm; The distance between one end of the straight pipe (11) close to the air outlet flange (12) and the air outlet flange (12) is ≥ 40 mm; The difference between the diameter of the straight pipe (11) and the diameter of the hole pipe (9) is ≥ 20 mm, and the outer diameter of the straight pipe (11) is ≤ 160 mm.

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