Exhaust noise reduction structure and vehicle

Abstract

The utility model belongs to the technical field of tail gas treatment, and particularly relates to an exhaust noise reduction structure and a vehicle, the exhaust noise reduction structure comprises a first noise reduction structure and a second noise reduction structure, the first noise reduction structure comprises a shell and a metal net, the metal net is arranged in the shell, and the periphery of the metal net is connected with the inner wall of the shell; the second silencing structure is connected to the air outlet end of the first silencing structure. By using the exhaust noise reduction structure in the technical scheme, the exhaust noise level is controlled and the low-noise design of the post-treatment is realized while the post-treatment is ensured to meet the emission regulation, so that the NVH (Noise Vibration and Harshness) performance of the whole vehicle is improved.

Description

Technical Field

[0001] This utility model belongs to the field of exhaust gas treatment technology, specifically relating to an exhaust noise reduction structure and a vehicle. Background Technology

[0002] In response to the ever-evolving emission regulations for commercial vehicles, significant technological reserves have been accumulated in exhaust aftertreatment technology. Common technologies utilize carriers such as DOC (Diesel Oxidation Catalyst), DPF (Diesel Particulate Filter), SCR (Selective Catalytic Reduction Device), and TWC (Three-Way Catalytic Converter). Under the same installation boundary conditions, the use of carriers gradually compresses the effective noise reduction volume of the aftertreatment system. The mixer structure design primarily focuses on the homogeneity of the gas-fuel mixture, without specifically addressing noise reduction through dedicated silencing structures. In short, the exhaust system lacks sufficient volume and silencing structures to attenuate exhaust sound waves. These sound waves radiate through the exhaust tailpipe, potentially causing severe NVH (Noise, Vibration, and Harshness) problems throughout the vehicle, becoming a major technical bottleneck hindering product market entry.

[0003] Existing solutions typically achieve noise reduction through the basic structure of the aftertreatment system, usually utilizing impedance changes in reactive mufflers such as expansion cavities and perforated pipes to reflect sound waves and generate noise reduction. However, engine exhaust noise includes both low-frequency exhaust order noise and mid-to-high-frequency airflow impact noise. Traditional mufflers require multiple broadband mufflers connected in series for noise reduction and occupy a large space, which cannot meet product development needs. Utility Model Content

[0004] The purpose of this invention is to provide an exhaust noise reduction structure that controls exhaust noise levels while ensuring the aftertreatment meets emission regulations, achieving a low-noise design for the aftertreatment system and thus improving the overall vehicle NVH performance. This objective is achieved through the following technical solution:

[0005] The first aspect of this utility model proposes an exhaust noise reduction structure, comprising:

[0006] A first noise reduction structure, comprising a housing and a metal mesh, wherein the metal mesh is disposed inside the housing and the outer periphery of the metal mesh is connected to the inner wall of the housing;

[0007] The second silencing structure is connected to the air outlet end of the first silencing structure.

[0008] The first silencing structure in this technical solution uses a metal mesh to scatter and interfere with the low-frequency exhaust order noise energy. When the high-speed airflow enters the housing, the concentrated energy of the exhaust order sound wave difference is dispersed as it passes through the metal mesh. Simultaneously, scattering occurs upon encountering the metal mesh, and the sound waves interfere with each other, resulting in energy conversion, ultimately transforming into heat dissipation, thus suppressing the concentrated low-frequency exhaust order noise. While the low-frequency exhaust order noise is suppressed by the metal mesh, exhaust airflow impact noise still exists. Furthermore, the high-speed airflow impacting the metal mesh poses a risk of aerodynamically regenerated noise. Therefore, this technical solution incorporates a second silencing structure to absorb mid-to-high frequency exhaust order noise. This exhaust noise reduction structure has a good silencing effect across the entire frequency range, effectively controlling exhaust noise levels while ensuring the aftertreatment meets emission regulations, achieving a low-noise design for the aftertreatment system, and thus improving the overall vehicle NVH performance.

[0009] In addition, the exhaust noise reduction structure of this utility model may also have the following additional technical features:

[0010] In some embodiments of this utility model, the second noise reduction structure includes a plurality of coaxially arranged support rings, adjacent support rings are connected by a noise reduction structure body, and the outermost support ring is coaxially arranged with the housing and connected to the air outlet of the housing.

[0011] In some embodiments of this utility model, the sound-absorbing structure body includes two first sound-absorbing plates and two second sound-absorbing plates. The two first sound-absorbing plates are spaced apart and arranged opposite to each other. The first sound-absorbing plates are arranged along the axial direction of the support ring, and the sides of the two first sound-absorbing plates are connected through the second sound-absorbing plates.

[0012] In some embodiments of this utility model, the first sound-absorbing plate and the second sound-absorbing plate are respectively provided with through holes.

[0013] In some embodiments of this utility model, the inner wall of the support ring is provided with a groove, and the groove is arranged along the circumference of the support ring.

[0014] In some embodiments of this utility model, the air outlet end of the second silencing structure is connected to a first air outlet pipe, and the inner diameter of the end of the first air outlet pipe away from the housing is smaller than the inner diameter of the end of the first air outlet pipe close to the housing.

[0015] In some embodiments of this utility model, the air outlet end of the second silencing structure is connected to an air outlet structure, the air outlet structure includes a connecting chamber and a second air outlet pipe, the air inlet end of the connecting chamber is connected to the air outlet end of the second silencing structure, the second air outlet pipe has an air outlet, one end of the second air outlet pipe away from the air outlet is inserted into the housing along the radial direction of the connecting chamber, and the second air outlet pipe is provided with a plurality of air outlet holes on the inner wall surface of the connecting chamber.

[0016] In some embodiments of this utility model, the sum of the areas of the plurality of air outlets is greater than the area of ​​the air outlet.

[0017] In some embodiments of this utility model, a positioning ring groove is provided on the inner circumference of the housing, and the outer circumference of the metal mesh is inserted into the positioning ring groove.

[0018] In some embodiments of this utility model, two positioning ring ribs are provided on the inner circumference of the housing, and the two positioning ring ribs are spaced apart to form the positioning ring groove.

[0019] In a second aspect, this utility model provides a vehicle that includes the exhaust noise reduction structure described in the above embodiments. Attached Figure Description

[0020] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0021] Figure 1 A partial structural schematic diagram of the exhaust noise reduction structure according to an embodiment of the present invention is shown schematically.

[0022] Figure 2 The schematic diagram illustrates the structure of a metal mesh according to an embodiment of the present invention. Figure 1 ;

[0023] Figure 3 The schematic diagram illustrates the structure of a metal mesh according to an embodiment of the present invention. Figure 2 ;

[0024] Figure 4 A schematic diagram of the structure of a metal mesh according to an embodiment of the present invention is shown. Figure 3 ;

[0025] Figure 5 A schematic diagram of the second noise reduction structure according to an embodiment of the present invention is shown from a certain perspective.

[0026] Figure 6 A schematic diagram of the second noise-absorbing structure according to an embodiment of the present invention is shown from another perspective;

[0027] Figure 7 A schematic diagram of the second noise reduction structure according to an embodiment of the present invention is shown from another perspective.

[0028] Figure 8 A schematic diagram of an exhaust noise reduction structure according to an embodiment of the present invention is shown.

[0029] Figure 9 A schematic diagram of another exhaust noise reduction structure according to an embodiment of the present invention is shown.

[0030] The labels in the attached diagram are as follows:

[0031] 100. First sound-absorbing structure; 110. Shell; 120. Metal mesh; 130. Positioning ring rib;

[0032] 200. Second silencing structure; 210. Support ring; 220. Silencing structure body; 221. First silencing plate; 222. Second silencing plate; 230. Groove;

[0033] 300. First exhaust pipe;

[0034] 400, Exhaust structure; 410, Connecting chamber; 420, Second exhaust pipe; 430, Exhaust hole; 440, Exhaust port. Detailed Implementation

[0035] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0036] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0037] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0038] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure is flipped, an element described as "below other elements or features" or "below other elements or features" would subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations.

[0039] Figure 1 A partial structural diagram of an exhaust noise reduction structure according to an embodiment of the present invention is shown schematically. Figure 1As shown, this utility model proposes an exhaust noise reduction structure, including a first noise reduction structure 100 and a second noise reduction structure 200. The first noise reduction structure 100 includes a housing 110 and a metal mesh 120. The metal mesh 120 is disposed inside the housing 110, and the outer periphery of the metal mesh 120 is connected to the inner wall of the housing 110. The second noise reduction structure 200 is connected to the exhaust end of the first noise reduction structure 100.

[0040] In this technical solution, the first silencing structure 100 in the exhaust noise reduction structure uses a metal mesh 120 to scatter and interfere with the low-frequency exhaust order noise energy. When the high-speed airflow enters the interior of the housing 110, the concentrated energy of the exhaust order sound wave difference is dispersed as it passes through the metal mesh 120. Simultaneously, scattering occurs upon encountering the metal mesh 120, and the sound waves interfere with each other, resulting in energy conversion, ultimately transforming into heat dissipation, thereby suppressing the concentrated low-frequency exhaust order noise. While the low-frequency exhaust order noise is suppressed by the metal mesh 120, exhaust airflow impact noise still exists. Furthermore, the high-speed airflow impacting the metal mesh 120 poses a risk of aerodynamically regenerated noise. Therefore, this technical solution incorporates a second silencing structure 200 to absorb mid-to-high frequency exhaust order noise. This exhaust noise reduction structure has a good silencing effect on exhaust noise across the entire frequency range, effectively controlling the exhaust noise level while ensuring that the aftertreatment meets emission regulations, achieving a low-noise design for the aftertreatment, and thus improving the overall vehicle NVH performance.

[0041] Furthermore, the metal mesh 120 is provided with multiple layers, and the multiple layers of metal mesh 120 are interconnected. Optionally, the number of metal mesh 120 layers is 1 to 10. For example, the number of metal mesh 120 layers can be 1, 3, 5, 7, or 10. Optionally, the metal mesh 120 is woven from metal wires. When the number of metal mesh 120 layers is multiple, the structure of each layer of metal mesh 120 can be the same or different. In one embodiment, the first sound-absorbing structure 100 includes three layers of metal mesh 120, and its weaving shape can be found in [reference needed]. Figures 2 to 4 By designing the thickness and weaving shape of each layer of metal mesh 120, and the distance between each layer of metal mesh 120, the first silencing structure 100 can be adapted to different low-frequency silencing bands and silencing amplitudes to meet the silencing requirements of different engine models.

[0042] Furthermore, a positioning ring groove is provided on the inner circumference of the housing 110, and the outer circumference of the metal mesh 120 is inserted into the positioning ring groove.

[0043] Understandably, the positioning ring groove serves a positioning function, preventing the first noise reduction structure 100 from moving after being impacted by airflow, thereby improving the overall stability and performance of the structure.

[0044] Furthermore, the inner circumference of the housing 110 is provided with two positioning ring ribs 130, and the two positioning ring ribs 130 are spaced apart to form positioning ring grooves.

[0045] By forming a positioning ring groove by providing a positioning ring rib 130 on the inner wall of the housing 110, the structure is simple and the structural strength of the housing 110 can be increased. In some other embodiments, the positioning ring groove can be formed by directly slotting the inner wall of the housing 110.

[0046] Furthermore, Figure 5 The diagram illustrates the structure of the second noise reduction structure according to an embodiment of the present invention from a certain perspective. Figure 6 A schematic diagram of the second noise-absorbing structure according to an embodiment of the present invention is shown from another perspective. See also Figure 5 and 6 The second noise reduction structure 200 includes multiple coaxially arranged support rings 210. Adjacent support rings 210 are connected by a noise reduction structure body 220. The outermost support ring 210 is coaxially arranged with the housing 110 and connected to the air outlet of the housing 110.

[0047] By adopting this structure, the noise reduction structure bodies 220 can be arranged as needed, thereby achieving a good noise reduction effect. Optionally, the noise reduction structure bodies 220 between adjacent support rings 210 are equally spaced along the circumference of the support rings 210. Optionally, multiple noise reduction structure bodies 220 are provided, and the multiple noise reduction structure bodies 220 are arranged along the circumference of the support rings 210.

[0048] Furthermore, the sound-absorbing structure body 220 includes two first sound-absorbing plates 221 and two second sound-absorbing plates 222. The two first sound-absorbing plates 221 are spaced apart and arranged opposite to each other. The first sound-absorbing plates 221 are arranged along the axial direction of the support ring 210, and the sides of the two first sound-absorbing plates 221 are connected by the second sound-absorbing plates 222.

[0049] Optionally, the first sound-absorbing plate 221 and the second sound-absorbing plate 222 can be made of mineral wool, fiber, or metal, etc. Optionally, the spacing between adjacent first sound-absorbing plates 221 can be set according to usage requirements. In another embodiment, the first sound-absorbing structure 100 includes a plurality of parallel support plates, and the connected support plates are connected by a plurality of sound-absorbing structures.

[0050] Furthermore, the first sound-absorbing plate 221 and the second sound-absorbing plate 222 are respectively provided with through holes.

[0051] The through holes ensure airflow and prevent airflow impact from damaging the sound-absorbing plate.

[0052] Optionally, multiple sound-absorbing particles can be disposed inside the sound-absorbing structure body 220. For example, the sound-absorbing particles can be mineral wool sound-absorbing particles. Mineral wool sound-absorbing particles are an excellent sound-absorbing material. Due to their internal microporous structure, they possess good sound absorption performance. Simultaneously, mineral wool materials also possess fire-resistant and heat-insulating properties. The sound-absorbing particles can also be ceramic sound-absorbing particles, which have a porous structure and can absorb sound waves of different frequencies. The sound-absorbing particles can also be organic fiber particles, glass fiber particles, or polyester fiber particles, etc.

[0053] Furthermore, Figure 7 A schematic diagram of the second noise-absorbing structure according to an embodiment of the present invention is shown from another perspective. See also Figure 7 The inner wall of the support ring 210 is provided with a groove 230, which is arranged along the circumference of the support ring 210.

[0054] The groove 230 is arranged circumferentially along the support ring 210 to form a quarter-wavelength tube. The quarter-wavelength tube utilizes the phase interference and resonance principles of sound waves to eliminate noise at specific frequencies. The length of the quarter-wavelength tube is one-quarter of the wavelength corresponding to the target noise reduction frequency. Optionally, each support ring 210 has multiple grooves 230 on its inner wall, spaced apart axially along the support ring 210. Optionally, the depths of the grooves 230 can be the same or different, and can be configured as needed to broaden the noise reduction frequency band.

[0055] Furthermore, Figure 8 A schematic diagram of an exhaust noise reduction structure according to an embodiment of the present invention is shown. See also Figure 8 In one embodiment, the outlet end of the second silencing structure 200 is connected to a first vent pipe 300, which extends axially along the housing 110. The inner diameter of the end of the first vent pipe 300 away from the housing 110 is smaller than the inner diameter of the end of the first vent pipe 300 close to the housing 110.

[0056] The first exhaust pipe 300 is configured to have a gradually contracting shape to ensure that the airflow can flow out evenly, thereby suppressing noise regeneration. Optionally, the inner diameter of the middle section of the first exhaust pipe 300 is gradually decreasing (gradually decreasing from near the housing 110 to away from the housing 110); or, the first exhaust pipe 300 is approximately frustum-shaped.

[0057] Furthermore, Figure 9 A schematic diagram of another exhaust noise reduction structure according to an embodiment of the present invention is shown. See also Figure 9In this embodiment, the air outlet end of the second silencing structure 200 is connected to an air outlet structure 400. The air outlet structure 400 includes a connecting chamber 410 and a second air outlet pipe 420. The air inlet end of the connecting chamber 410 is connected to the air outlet end of the second silencing structure 200. The second air outlet pipe 420 has an air outlet 440. One end of the second air outlet pipe 420 away from the air outlet 440 is inserted into the housing 110 radially along the connecting chamber 410. The second air outlet pipe 420 is provided with a plurality of air outlet holes 430 on the inner wall surface of the connecting chamber 410.

[0058] In the above embodiment, after passing through the first silencing structure 100 and the second silencing structure 200, the airflow enters the second exhaust pipe 420 through the exhaust port 430, and then flows upward from the exhaust port 440. By adopting this structure, it can be ensured that the airflow flows evenly to the second exhaust pipe 420 and flows out from the second exhaust pipe 420, thereby reducing the generation of regenerated noise.

[0059] Furthermore, the sum of the areas of the multiple air vents 430 is greater than the area of ​​the air outlet 440.

[0060] By making the sum of the areas of the multiple air outlets 430 greater than the area of ​​the air outlet 440, it can be ensured that the airflow exits at a suitable and stable velocity. Optionally, the sum of the areas of the multiple air outlets 430 can be 1.5 times the area of ​​the air outlet 440.

[0061] This technical solution also provides a vehicle including the aforementioned exhaust noise reduction structure.

[0062] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the scope of protection of this utility model. Therefore, the scope of protection of this utility model should be determined by the scope of the claims.

Claims

1. An exhaust noise reduction structure characterized by comprising: include: A first noise reduction structure (100) includes a housing (110) and a metal mesh (120). The metal mesh (120) is disposed inside the housing (110), and the outer periphery of the metal mesh (120) is connected to the inner wall of the housing (110). The second silencing structure (200) is connected to the air outlet of the first silencing structure (100).

2. The exhaust noise reducing structure according to claim 1, characterized by, The second silencing structure (200) includes a plurality of coaxially arranged support rings (210), adjacent support rings (210) are connected by a silencing structure body (220), and the outermost support ring (210) is coaxially arranged with the housing (110) and connected to the air outlet end of the housing (110).

3. The exhaust noise reducing structure according to claim 2, characterized by, The sound-absorbing structure body (220) includes two first sound-absorbing plates (221) and two second sound-absorbing plates (222). The two first sound-absorbing plates (221) are spaced apart and arranged opposite to each other. The first sound-absorbing plates (221) are arranged along the axial direction of the support ring (210). The sides of the two first sound-absorbing plates (221) are connected by the second sound-absorbing plates (222).

4. The exhaust noise reducing structure according to claim 3, characterized by, The first sound-absorbing plate (221) and the second sound-absorbing plate (222) are respectively provided with through holes.

5. The exhaust noise reducing structure according to any one of claims 2 to 4, characterized by, The inner wall of the support ring (210) is provided with a groove (230), which is arranged along the circumference of the support ring (210).

6. The exhaust noise reducing structure according to any one of claims 1 to 4, characterized by, The second silencing structure (200) has a first vent pipe (300) connected to its vent end. The inner diameter of the end of the first vent pipe (300) away from the housing (110) is smaller than the inner diameter of the end of the first vent pipe (300) close to the housing (110).

7. The exhaust noise reducing structure according to any one of claims 1 to 4, characterized by, The second silencing structure (200) has an outlet structure (400) connected to its outlet end. The outlet structure (400) includes a connecting chamber (410) and a second outlet pipe (420). The inlet end of the connecting chamber (410) is connected to the outlet end of the second silencing structure (200). The second outlet pipe (420) has an outlet (440). The end of the second outlet pipe (420) away from the outlet (440) is inserted into the housing (110) radially along the connecting chamber (410). The second outlet pipe (420) has a plurality of outlet holes (430) on the inner wall of the connecting chamber (410).

8. The exhaust noise reducing structure according to claim 7, characterized by, The sum of the areas of the plurality of air outlets (430) is greater than the area of ​​the air outlet (440).

9. The exhaust noise reducing structure according to any one of claims 1 to 4, characterized by, The inner circumference of the housing (110) is provided with a positioning ring groove, and the outer circumference of the metal mesh (120) is inserted into the positioning ring groove.

10. A vehicle characterized by comprising: The exhaust noise reduction structure includes any one of claims 1 to 9.

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