Silencer for aftertreatment exhaust system

Abstract

The utility model provides a silencer for an after-treatment exhaust system, which comprises a shell, a first end cover is arranged at one end of the shell, a second end cover is arranged at the other end of the shell, the shell comprises a cavity, a first partition plate, a second partition plate, a third partition plate and a fourth partition plate are arranged in the cavity, and the first partition plate, the second partition plate, the third partition plate and the fourth partition plate are arranged in the cavity. The cavity is divided into a first chamber, a second chamber, a third chamber, a fourth chamber and a fifth chamber; first silencing holes are formed in the second partition plate, the third partition plate and the fourth partition plate; one end of the air outlet pipe assembly is arranged in the cavity, and the other end of the air outlet pipe assembly is arranged outside the shell; the air inlet pipe assembly comprises a first air inlet pipe section and a second air inlet pipe section which are communicated with each other; a pressure relief hole is formed in the middle pipe section. According to the embodiment of the utility model, the first cavity realizes the effect of adjusting the cavity so as to eliminate noise under specific frequency, the air outlet tail pipe is arranged to relieve the noise, and the silencing holes are formed in the 1 / 2 position, so that the effect of breaking standing waves can be achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of engine exhaust systems, and in particular relates to a muffler used in a post-processing exhaust system. Background Art

[0002] NVH index (Noise Vibration Harshness) is an important indicator to measure the performance of automobiles, and exhaust NVH is no exception. In recent years, new energy vehicles have been developing rapidly. The existing mufflers in the exhaust system of hybrid extended-range vehicles are not ideal for eliminating noise. In addition, the battery pack is arranged in the middle of the chassis, which has certain restrictions on the installation of the muffler. Therefore, it is necessary to redesign a muffler suitable for the exhaust system of new energy vehicles. Summary of the invention

[0003] In order to solve at least one technical problem in the prior art, the embodiment of the utility model provides a muffler for a post-processing exhaust system to effectively reduce noise. To achieve the above technical objectives, the technical solution adopted by the embodiment of the utility model is:

[0004] The present utility model provides a muffler for a post-processing exhaust system, comprising:

[0005] The shell extends in the length direction, one end of the shell is provided with a first end cover, the other end is provided with a second end cover, and the shell includes a cavity,

[0006] The cavity is provided with a first partition, a second partition, a third partition, and a fourth partition.

[0007] The first partition, the second partition, the third partition, and the fourth partition are sequentially arranged from the first end cover to the second end cover, and divide the cavity into a first chamber, a second chamber, a third chamber, a fourth chamber, and a fifth chamber;

[0008] The second partition, the third partition, and the fourth partition are provided with a first muffler hole;

[0009] An air outlet pipe assembly, one end of which is disposed in the cavity and the other end of which is disposed outside the shell;

[0010] The air intake pipe assembly comprises a first air intake pipe section and a second air intake pipe section which are interconnected.

[0011] One end of the first air inlet pipe section passes through the first baffle and is disposed in the first chamber, and the other end passes through the second baffle and is disposed in the third chamber.

[0012] The second air inlet pipe section is disposed in the third chamber, one end of the second air inlet pipe section is connected to the housing, and the other end of the second air inlet pipe section is connected to the other end of the first air inlet pipe section.

[0013] The first air intake pipe section and / or the second air intake pipe section is provided with a second muffler hole;

[0014] An intermediate pipe section is provided with a pressure relief hole, one end of the intermediate pipe section passes through the first partition plate and is arranged in the first chamber, and the other end of the intermediate pipe section passes through the second partition plate and is arranged in the third chamber.

[0015] Furthermore, a distance between an end of the first air intake pipe section away from the second air intake pipe section and the second muffler hole on the first air intake pipe section is 100 to 110 mm.

[0016] Furthermore, the air intake pipe assembly also includes a third air intake pipe section, one end of the third air intake pipe section is fixedly connected to the shell and one end of the second air intake pipe section to form a first connection, and the other end is used to set the air intake flange assembly.

[0017] Furthermore, the third air intake pipe section is a flattened pipe structure.

[0018] Furthermore, the air outlet pipe assembly comprises:

[0019] a first air outlet pipe section, disposed on the fourth partition plate, one end of the first air outlet pipe section being disposed in the fourth chamber, and the other end of the first air outlet pipe section being disposed in the fifth chamber;

[0020] a second air outlet pipe section, one end of which passes through the first end cover and is disposed outside the shell, and the other end of which passes through the first partition, the second partition, the third partition, the fourth partition in sequence, and is disposed in the fifth chamber;

[0021] The third air outlet pipe section is arranged in the fifth chamber, and the third air outlet pipe section connects the other end of the first air outlet pipe section and the other end of the second air outlet pipe section.

[0022] Furthermore, the air outlet pipe assembly further comprises an air outlet tail pipe, one end of which is fixedly connected to one end of the second air outlet pipe section and the first end cover to form a second connection;

[0023] A third muffler hole is provided at 1 / 2 of the overall length of the air outlet pipe assembly.

[0024] Further, the first connection point and the end of the third air intake pipe section are arranged on the inner side of the shell, and the end of the second air intake pipe section is arranged between the end of the third air intake pipe section and the shell;

[0025] And / or, the second connection point and the end of the second air outlet pipe section are arranged on the inner side of the first end cover, and the end of the air outlet tail pipe is arranged between the end of the second air outlet pipe section and the first end cover.

[0026] Furthermore, the diameter of the air outlet pipe assembly is 48-55 mm.

[0027] Furthermore, sound-absorbing cotton is arranged in the second chamber.

[0028] Furthermore, a hook assembly is provided on the first end cover and / or the second end cover.

[0029] The beneficial effects brought by the technical solution provided by the embodiment of the utility model are:

[0030] 1) The embodiment of the utility model provides a muffler for a post-treatment exhaust system, which, by providing a closed first chamber and limiting the position of a first intake pipe section and an intermediate pipe section, enables the first chamber to function as an adjusting chamber, thereby being able to eliminate noise at a specific frequency.

[0031] 2) In the embodiment of the utility model, a pressure relief hole (4a) is arranged on the second air intake pipe section, so as to avoid the problem of excessive back pressure caused by the air intake flow directly entering the first chamber.

[0032] 3) The embodiment of the utility model extends the length of the outlet pipe assembly by providing an outlet tail pipe, reduces noise, and provides a silencer hole at 1 / 2 to interrupt standing waves.

[0033] 4) The embodiment of the utility model limits the diameter of the outlet pipe assembly to 48-55 mm, which can reduce the flow noise by 2-3 Db (A). BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the structure of a muffler used for a post-processing exhaust system in an embodiment of the utility model.

[0035] Figure 2 It is a schematic diagram of the internal structure of a muffler used for a post-processing exhaust system in an embodiment of the utility model.

[0036] Figure 3 It is a schematic diagram of the internal structure of a muffler used for a post-processing exhaust system in an embodiment of the utility model. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0038] In the description of the embodiments of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0039] In the description of the embodiments of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can also be the internal connection of two components, it can be a wireless connection, or it can be a wired connection. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0040] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0041] The present utility model provides a muffler for a post-processing exhaust system, comprising:

[0042] The shell 1 extends along the length direction X, and one end of the shell 1 is provided with a first end cover 11, and the other end is provided with a second end cover 12. The shell 1 includes a cavity.

[0043] The cavity is provided with a first partition plate 13, a second partition plate 14, a third partition plate 15, and a fourth partition plate 16.

[0044] The first partition 13, the second partition 14, the third partition 15, and the fourth partition 16 are sequentially arranged from the first end cover 11 to the second end cover 12, and divide the cavity into a first chamber A, a second chamber B, a third chamber C, a fourth chamber D, and a fifth chamber E;

[0045] The second partition plate 14, the third partition plate 15, and the fourth partition plate 16 are provided with a first muffler hole 14a;

[0046] An air outlet pipe assembly 2, one end of which is disposed in the cavity, and the other end of which is disposed outside the housing 1;

[0047] The air intake pipe assembly 3 includes a first air intake pipe section 31 and a second air intake pipe section 32 which are connected to each other.

[0048] One end of the first air inlet pipe section 31 passes through the first baffle 13 and is disposed in the first chamber A, and the other end passes through the second baffle 14 and is disposed in the third chamber C.

[0049] The second air inlet pipe section 32 is disposed in the third chamber C, one end of the second air inlet pipe section 32 is connected to the housing 1, and the other end is connected to the other end of the first air inlet pipe section 31.

[0050] The first air intake pipe section 31 and / or the second air intake pipe section 32 are provided with a second muffler hole 31a;

[0051] The middle pipe section 4 is provided with a pressure relief hole 4a, one end of the middle pipe section 4 passes through the first partition plate 13 and is arranged in the first chamber A, and the other end passes through the second partition plate 14 and is arranged in the third chamber C.

[0052] In a specific embodiment, Figure 2 As shown, the left end of the shell 1 is the second end cover 12, and the right end is the first end cover 11. From right to left, they are the first chamber A, the first partition 13, the second chamber B, the second partition 14, the third chamber C, the third partition 15, the fourth chamber D, the fourth partition 16, and the fifth chamber E.

[0053] During operation, the airflow enters from the first air intake section 31 in the air intake pipe assembly 3, part of the airflow is absorbed by the second muffler hole 31a on the first air intake section 31 to reduce noise, or enters the third chamber C to reduce back pressure, and another part of the airflow enters the second air intake section 32; at this time, part of the airflow in the second air intake section 32 is absorbed by the second muffler hole 31a on the second air intake section 32 to reduce part of the high-frequency noise, and part of the airflow directly enters the first chamber A. Since the first partition plate 13 is not provided with a muffler hole, the first chamber A can play the role of regulating the chamber, that is, the resonance of some frequencies is formed through the first chamber A, thereby reducing noise. In addition, since the right end of the intermediate pipe section 4 is arranged in the first chamber A, and the left end is arranged in the third chamber C, part of the airflow in the first chamber A enters the third chamber C through the intermediate pipe section 4, and another part of the airflow flows out through the pressure relief hole 4a on the intermediate pipe section 4 and enters the second chamber B to reduce back pressure. Since the first silencer hole 14a is provided on the second partition plate 14, the third partition plate 15 and the fourth partition plate 16, the airflow in the second chamber B will enter the third chamber C through the second partition plate 14, and the airflow in the third chamber C will enter the fourth chamber D through the third partition plate 15 and then enter the fifth chamber E through the fourth partition plate 16.

[0054] Furthermore, the interval L1 between the end of the first air intake pipe section 31 away from the second air intake pipe section 32 and the second silencer hole 31a on the first air intake pipe section 31 is 100 to 110 mm. As mentioned above, since there is no silencer hole on the first partition plate 13, the first air intake pipe section 31 can make the first chamber A form a regulating chamber at the interval L1, thereby eliminating noise with a frequency of 45 to 50 Hz.

[0055] Furthermore, the air intake pipe assembly 3 also includes a third air intake pipe segment 33, one end of the third air intake pipe segment 33 is fixedly connected to the shell 1 and one end of the second air intake pipe segment 32 to form a first connection, and the other end is used to set the air intake flange assembly 6, and the fixed connection can be a welding connection.

[0056] Furthermore, the third air intake pipe section 33 is a flattened tube structure. In actual use, the position of the third air intake pipe is close to the battery pack in the after-treatment system. Therefore, part or all of the third air intake pipe section 33 is set to a flattened tube structure, which is smaller in size and saves space.

[0057] One end of the air outlet pipe assembly 2 is arranged in the cavity, and the other end is arranged outside the shell 1. It can be understood that one end of the air outlet pipe assembly 2 can be arranged in any one of the second chamber B, the third chamber C, the fourth chamber D, and the fifth chamber E, so as to make the gas in the second chamber B, the third chamber C, the fourth chamber D, and the fifth chamber E flow out of the shell 1. In a specific embodiment, the air outlet pipe assembly 2 includes:

[0058] A first air outlet pipe section 21 is provided on the fourth partition plate 16, one end of the first air outlet pipe section 21 is provided in the fourth chamber D, and the other end is provided in the fifth chamber E;

[0059] A second air outlet pipe section 22, one end of which passes through the first end cover 11 and is disposed outside the housing 1, and the other end of which passes through the first baffle 13, the second baffle 14, the third baffle 15, and the fourth baffle 16 in sequence and is disposed in the fifth chamber E;

[0060] The third air outlet pipe section 23 is disposed in the fifth chamber E, and the third air outlet pipe section 23 connects the other end of the first air outlet pipe section 21 and the other end of the second air outlet pipe section 22 .

[0061] like Figure 3 As shown, the first air outlet pipe section 21 and the second air outlet pipe section 22 are straight pipes, and the third air outlet pipe section 23 is a 180° bent pipe, so that the third air outlet pipe section 23 can connect the first air outlet pipe section 21 and the second air outlet pipe section 22. This structure can greatly extend the length of the air outlet pipe assembly 2, thereby reducing the flow rate of the gas.

[0062] Since the second baffle 14, the third baffle 15 and the fourth baffle 16 are all provided with the first silencer hole 14a, during operation, the airflow entering the second chamber B and the third chamber C from the intake pipe assembly 3 will enter the fourth chamber D through the third baffle 15, wherein a small part of the airflow will enter the fifth chamber E through the fourth baffle 16 again to consume energy, and most of the airflow will flow out of the silencer for the post-treatment exhaust system through the first outlet pipe section 21, the third outlet pipe section 23 and the second outlet pipe section 22 in sequence.

[0063] Furthermore, the outlet pipe assembly 2 further includes an outlet tail pipe 24, one end of the outlet tail pipe 24 is fixedly connected to one end of the second outlet pipe section 22 and the first end cover 11 to form a second connection;

[0064] A third muffler hole 2a is provided at 1 / 2 of the overall length of the air outlet pipe assembly 2.

[0065] The exhaust tail pipe 24 extends the length of the exhaust pipe assembly 2, which can alleviate the problem of excessive noise. In actual use, the overall length of the exhaust pipe assembly 2 can reach 1100-1120 mm. When the length is longer, an exhaust pipe standing wave will be generated. Therefore, a third muffler hole 2a is provided at 1 / 2 of the exhaust pipe assembly 2 to interrupt the standing wave and reduce noise.

[0066] Further, the first connection point and the end of the third air intake pipe section 33 are arranged on the inner side of the housing 1, and the end of the second air intake pipe section 32 is arranged between the end of the third air intake pipe section 33 and the housing 1;

[0067] And / or, the second connection and the end of the second air outlet pipe section 22 are arranged on the inner side of the first end cover 11, and the end of the air outlet tail pipe 24 is arranged between the end of the second air outlet pipe section 22 and the first end cover 11. The first connection or the second connection can be welded, and this structure is conducive to the airflow flowing out on a relatively smooth surface to avoid the generation of noise.

[0068] Furthermore, the diameter of the air outlet pipe assembly 2 is 48-55 mm, and the air outlet pipe assembly 2 within this diameter range can reduce flow noise by 2-3 DbA.

[0069] Furthermore, the second chamber B is provided with a sound-absorbing cotton 5, and the sound-absorbing cotton 5 helps to further reduce the flow noise.

[0070] Furthermore, the first end cover 11 and / or the second end cover 12 is provided with a hook assembly 7. In a specific embodiment, Figure 1 As shown, the second end cover 12 on the left side of the shell 1 is provided with a left hook assembly 7, and the first end cover 11 on the right side of the shell 1 is provided with a right hook assembly 7. This structure enables the muffler for the post-treatment exhaust system to form an integral whole and facilitates installation and disassembly.

[0071] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to examples, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A muffler for an aftertreatment exhaust system, characterized in that: include: The shell (1) extends along a length direction (X), one end of the shell (1) is provided with a first end cover (11), and the other end of the shell (1) is provided with a second end cover (12), and the shell (1) comprises a cavity. A first partition (13), a second partition (14), a third partition (15), and a fourth partition (16) are provided in the cavity. The first partition plate (13), the second partition plate (14), the third partition plate (15), and the fourth partition plate (16) are arranged in sequence from the first end cover (11) to the second end cover (12), and divide the cavity into a first chamber (A), a second chamber (B), a third chamber (C), a fourth chamber (D), and a fifth chamber (E); The second partition plate (14), the third partition plate (15), and the fourth partition plate (16) are provided with a first muffler hole (14a); An air outlet pipe assembly (2), one end of the air outlet pipe assembly (2) being arranged in the cavity, and the other end of the air outlet pipe assembly (2) being arranged outside the shell (1); An air intake pipe assembly (3) comprises a first air intake pipe section (31) and a second air intake pipe section (32) which are interconnected. One end of the first air inlet pipe section (31) passes through the first baffle (13) and is disposed in the first chamber (A), and the other end passes through the second baffle (14) and is disposed in the third chamber (C). The second air intake pipe section (32) is arranged in the third chamber (C), one end of the second air intake pipe section (32) is connected to the housing (1), and the other end is connected to the other end of the first air intake pipe section (31). The first air intake pipe section (31) and / or the second air intake pipe section (32) are provided with a second muffler hole (31a); An intermediate pipe section (4), wherein the intermediate pipe section (4) is provided with a pressure relief hole (4a), one end of the intermediate pipe section (4) passes through the first partition plate (13) and is arranged in the first chamber (A), and the other end of the intermediate pipe section (4) passes through the second partition plate (14) and is arranged in the third chamber (C).

2. The muffler for an aftertreatment exhaust system according to claim 1, characterized in that: The distance (L1) between the end of the first air intake pipe section (31) away from the second air intake pipe section (32) and the second muffler hole (31a) on the first air intake pipe section (31) is 100 to 110 mm.

3. The muffler for a post-treatment exhaust system according to claim 1, characterized in that: The air intake pipe assembly (3) further comprises a third air intake pipe section (33), one end of the third air intake pipe section (33) being fixedly connected to the housing (1) and one end of the second air intake pipe section (32) to form a first connection, and the other end being used for arranging an air intake flange assembly (6).

4. The muffler for a post-treatment exhaust system according to claim 3, characterized in that: The third air intake pipe section (33) is a flattened pipe structure.

5. The muffler for a post-treatment exhaust system according to claim 3, characterized in that: The air outlet pipe assembly (2) comprises: a first air outlet pipe section (21) disposed on the fourth partition plate (16), one end of the first air outlet pipe section (21) being disposed in the fourth chamber (D) and the other end of the first air outlet pipe section (21) being disposed in the fifth chamber (E); a second air outlet pipe section (22), one end of the second air outlet pipe section (22) passing through the first end cover (11) and being arranged outside the shell (1), and the other end of the second air outlet pipe section (22) passing through the first partition plate (13), the second partition plate (14), the third partition plate (15), and the fourth partition plate (16) in sequence and being arranged in the fifth chamber (E); The third air outlet pipe section (23) is arranged in the fifth chamber (E), and the third air outlet pipe section (23) connects the other end of the first air outlet pipe section (21) and the other end of the second air outlet pipe section (22).

6. The muffler for an aftertreatment exhaust system according to claim 5, characterized in that: The air outlet pipe assembly (2) further comprises an air outlet tail pipe (24), one end of the air outlet tail pipe (24) being fixedly connected to one end of the second air outlet pipe section (22) and the first end cover (11) to form a second connection point; A third muffler hole (2a) is provided at 1 / 2 of the overall length of the air outlet pipe assembly (2).

7. The muffler for an aftertreatment exhaust system according to claim 6, characterized in that: The first connection point and the end of the third air intake pipe section (33) are arranged on the inner side of the shell (1), and the end of the second air intake pipe section (32) is arranged between the end of the third air intake pipe section (33) and the shell (1); And / or, the second connection point and the end of the second air outlet pipe section (22) are arranged on the inner side of the first end cover (11), and the end of the air outlet tail pipe (24) is arranged between the end of the second air outlet pipe section (22) and the first end cover (11).

8. The muffler for an aftertreatment exhaust system according to claim 1, characterized in that: The diameter of the air outlet pipe assembly (2) is 48 to 55 mm.

9. The muffler for a post-treatment exhaust system according to claim 1, characterized in that: The second chamber (B) is provided with sound-absorbing cotton (5).

10. The muffler for an aftertreatment exhaust system according to claim 1, characterized in that: The first end cover (11) and / or the second end cover (12) is provided with a hook assembly (7).

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