Exhaust silencing system and vehicle

Abstract

The utility model relates to the technical field of vehicle production and manufacturing, in particular to an exhaust silencing system and a vehicle. The first partition plate and the second partition plate are arranged in the first noise reduction channel at intervals to form a first noise reduction cavity, a second noise reduction cavity and a third noise reduction cavity, and the first partition plate forms a vent hole so that the cross section area of the communicating position between the first noise reduction cavity and the second noise reduction cavity can be reduced. The opening degree of the communication position between the second silencing cavity and the third silencing cavity is adjusted through the valve, so that the cross section area between the second silencing cavity and the third silencing cavity is reduced, sound waves are reflected in the first silencing cavity, the second silencing cavity and the third silencing cavity, and reflected waves are opposite to original sound waves in phase. And the exhaust noise is reduced by absorbing acoustic impedance. And the noise reduction medium in the first noise reduction cavity can absorb noise through friction loss, so that the noise is further reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of vehicle production and manufacturing, specifically to an exhaust muffler system and a vehicle. Background Technology

[0002] Range extender exhaust noise mainly includes airflow noise and pulsation noise. Airflow noise refers to the broadband noise generated by friction and turbulence between high-temperature, high-pressure exhaust gas and the pipeline when it is rapidly discharged; pulsation noise refers to the pressure pulsation caused by the periodic ignition and exhaust of the range extender. Exhaust noise can seriously affect the vehicle's noise, vibration, and harshness (NVH) performance. Utility Model Content

[0003] The purpose of this application is to provide an exhaust muffler system and a vehicle.

[0004] This application provides an exhaust silencing system, including a first silencer, the first silencer comprising: a valve; a first pipe forming a first silencing channel, the first silencing channel including a first air outlet; a partition, including a first partition and a second partition, the first partition and the second partition being spaced apart within the first silencing channel to form a first silencing cavity, a second silencing cavity and a third silencing cavity, the first silencing cavity, the second silencing cavity and the third silencing cavity being sequentially arranged from near the first air outlet to away from the first air outlet, the first partition forming a vent hole, the second partition forming a valve port corresponding to the valve, the valve being disposed at the valve port; and a silencing pipe, including a first pipe, the first pipe being disposed in the first silencing cavity and abutting against the first partition, the outer wall of the first pipe being filled with a silencing medium between the inner wall of the first silencing cavity and the first pipe connecting the vent hole and the first air outlet.

[0005] In one exemplary embodiment of this application, the first silencing channel includes a first air inlet, and the silencing pipe further includes a second pipe. The second pipe is disposed in the third silencing cavity and abuts against the second partition. The second pipe connects the first air inlet and the valve port.

[0006] In one exemplary embodiment of this application, the exhaust silencing system further includes a second muffler, the second muffler including a second pipe body and a third pipe, the second pipe body forming a second silencing channel communicating with the first silencing channel, the third pipe being disposed in the second silencing channel and extending in the same direction as the second silencing channel, and the silencing medium filling the space between the outer wall of the third pipe and the inner wall of the second silencing channel.

[0007] In one exemplary embodiment of this application, the diameters of the first tube and the second tube are between 80 mm and 120 mm, and the lengths of the first tube and the second tube are between 300 mm and 500 mm.

[0008] In one exemplary embodiment of this application, the number of first mufflers is two, and the number of second mufflers is one; the exhaust muffler system includes a first exhaust pipe and a second exhaust pipe, the first exhaust pipe extends along a first direction, a portion of the second exhaust pipe extends along the first direction, a portion of the second exhaust pipe extends along a second direction, the first exhaust pipe connects between two first mufflers, and the second exhaust pipe connects between one first muffler and one second muffler, the first direction being perpendicular to the second direction.

[0009] In one exemplary embodiment of this application, the number of the first muffler is one, and the number of the second muffler is two; the exhaust muffler system includes a first bend and a second bend, the first bend is connected between the first muffler and one second muffler, the second bend is connected between two second mufflers, the bending angle of the first bend is between 150 degrees and 180 degrees, and the bending angle of the second bend is between 150 degrees and 180 degrees.

[0010] In one exemplary embodiment of this application, the first pipe, the second pipe, and the third pipe are provided with vent holes. The first pipe is connected to the first silencing cavity through the vent holes, the second pipe is connected to the third silencing cavity through the vent holes, and the third pipe is connected to the second silencing channel through the vent holes.

[0011] In one exemplary embodiment of this application, the second partition forms a hole in the radial direction of the valve port, and the hole communicates between the second silencing cavity and the third silencing cavity.

[0012] In one exemplary embodiment of this application, the flow rate of the orifice is less than the flow rate of the valve port.

[0013] This application also provides a vehicle including the aforementioned exhaust muffler system.

[0014] This application discloses an exhaust noise reduction system and vehicle, which has the following beneficial effects: A first pipe body forms a first noise reduction channel, including a first air outlet, through which exhaust noise enters and exits. A first baffle and a second baffle are spaced apart within the first noise reduction channel to form a first noise reduction cavity, a second noise reduction cavity, and a third noise reduction cavity. The baffles isolate the first, second, and third noise reduction cavities. The first baffle forms a vent hole, reducing the cross-sectional area at the connection between the first and second noise reduction cavities. A valve is installed on the second baffle at the connection between the second and third noise reduction cavities, adjusting the opening and closing degree to further reduce the cross-sectional area between them. This structure causes sound waves to be reflected within the first, second, and third noise reduction cavities. The reflected waves are out of phase with the original sound waves, achieving interference cancellation and absorbing acoustic impedance to reduce exhaust noise. Furthermore, a first pipe is located within the first noise reduction cavity and abuts against the first baffle, with a noise-absorbing medium filling the space between the outer wall of the first pipe and the inner wall of the first noise reduction cavity. The noise-absorbing medium inside the first noise-absorbing cavity can also absorb noise through frictional loss, thereby further reducing noise.

[0015] Other features and advantages of this application will become apparent from the following detailed description, or may be learned in part from practice of this application.

[0016] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0018] Figure 1 This is a cross-sectional schematic diagram of the first silencer in an embodiment of this utility model;

[0019] Figure 2 This is a cross-sectional schematic diagram of the second muffler in an embodiment of this utility model;

[0020] Figure 3 yes Figure 1 A cross-sectional schematic diagram of AA in the middle;

[0021] Figure 4 yes Figure 1 Cross-sectional schematic diagram of BB;

[0022] Figure 5 This is a first layout schematic diagram of the exhaust silencing system in an embodiment of this utility model;

[0023] Figure 6 This is a schematic diagram of the second layout of the exhaust muffler system in an embodiment of this utility model.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. First silencer; 10. Valve; 20. First pipe body; 21. First silencer channel; 22. First air outlet; 23. First air inlet; 30. Partition; 31. First partition; 301. Vent hole; 32. Second partition; 3201. Valve port; 3202. Hole; 33. First silencer chamber; 34. Second silencer chamber; 35. Third silencer chamber; 40. Silencing pipe; 41. First pipe; 42. Silencing medium; 43. Second pipe; 50. Vent hole; 2. Second silencer; 100. Second pipe body; 110. Second silencer channel; 200. Third pipe; 311. First exhaust pipe; 312. Second exhaust pipe; 321. First bend; 322. Second bend; 3. Battery; X1. First direction; X2. Second direction. Detailed Implementation

[0026] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided to make this application more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art.

[0027] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this application. However, those skilled in the art will recognize that the technical solutions of this application can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., can be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this application.

[0028] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments. It should be noted that the technical features involved in the various embodiments described below can be combined with each other as long as they do not conflict with each other. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present application, and should not be construed as limiting the present application.

[0029] It should be noted that "multiple" in this article refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0030] Range extender exhaust noise mainly includes airflow noise and pulsation noise. Airflow noise refers to the broadband noise generated by friction and turbulence between high-temperature, high-pressure exhaust gas and the pipeline when it is rapidly discharged; pulsation noise refers to the pressure pulsation caused by the periodic ignition and exhaust of the range extender. Exhaust noise can seriously affect the vehicle's noise, vibration, and harshness (NVH) performance.

[0031] This application provides an exhaust silencing system, including a first silencer 1. The first silencer 1 includes a valve 10, a first pipe body 20, a baffle 30, and a silencing pipe 40. The first pipe body 20 forms a first silencing channel 21, which includes a first air outlet 22. The baffle 30 includes a first baffle 31 and a second baffle 32, which are spaced apart within the first silencing channel 21 to form a first silencing cavity 33, a second silencing cavity 34, and a third silencing cavity 35. The silencing chamber 35 is arranged sequentially from the direction closest to the first air outlet 22 toward the direction away from the first air outlet 22. The first partition 31 forms a vent 301, and the second partition 32 forms a valve port 3201 corresponding to the valve 10. The valve 10 is located at the valve port 3201. The silencing pipe 40 includes a first pipe 41, which is located in the first silencing chamber 33 and abuts against the first partition 31. The outer wall of the first pipe 41 and the inner wall of the first silencing chamber 33 are filled with a silencing medium 42. The first pipe 41 connects the vent 301 and the first air outlet 22.

[0032] In some embodiments, the first pipe body 20 forms a first silencing channel 21, the first silencing channel 21 including a first air outlet 22, and exhaust noise enters the first silencing channel 21 and is discharged from the first air outlet 22. The first partition 31 and the second partition 32 are spaced apart within the first silencing channel 21 to form a first silencing cavity 33, a second silencing cavity 34, and a third silencing cavity 35. These silencing cavities are separated by a partition 30. The first partition 31 forms a vent hole 301, which reduces the cross-sectional area at the connection between the first silencing cavity 33 and the second silencing cavity 34. The second partition 32 is equipped with a valve 10, which adjusts the opening degree at the connection between the second silencing cavity 34 and the third silencing cavity 35, thereby reducing the cross-sectional area between them. This structure causes sound waves to be reflected within the first silencing cavity 33, the second silencing cavity 34, and the third silencing cavity 35. The reflected waves are out of phase with the original sound waves, achieving interference cancellation and absorbing acoustic impedance to reduce exhaust noise. Furthermore, the first pipe 41 is disposed in the first silencing cavity 33 and abuts against the first partition 31, and the space between the outer wall of the first pipe 41 and the inner wall of the first silencing cavity 33 is filled with a silencing medium 42. The silencing medium 42 in the first silencing cavity 33 can also absorb noise through frictional loss, thereby further reducing noise.

[0033] In some embodiments, the exhaust gas generated by the range extender enters the muffler channel after being discharged from the range extender. It first enters the third muffler chamber 35, then the second muffler chamber 34 and the first muffler chamber 33, and is discharged from the first outlet 22. The exhaust noise is reflected and weakened in the third muffler chamber 35, the second muffler chamber 34 and the first muffler chamber 33 before being discharged.

[0034] In some embodiments, valve 10 includes a one-way valve, a flow valve, an electronic valve, etc. Valve 10 controls the gas flow rate at valve port 3201, causing the gas to expand and reflect within the second silencing chamber 34 and the third silencing chamber 35. Valve 10 opens in the direction of gas inflow to gas outflow, and the opening degree of valve 10 can be changed by the exhaust gas pressure; that is, the greater the gas flow pressure, the greater the opening degree of valve 10, and the lower the gas flow pressure, the smaller the opening degree of valve 10. Specifically, valve 10 is located between the third silencing chamber 35 and the second silencing chamber 34 on the second partition 32, and valve 10 opens from the third silencing chamber 35 towards the second silencing chamber 34.

[0035] In some embodiments, the valve port 3201 is connected to the valve 10 by welding, riveting, or other means. The valve 10 may be located on the side of the third silencing cavity 35 facing the second silencing cavity 34, and the valve 10 is connected to the second partition 32.

[0036] In some embodiments, valve 10 places high demands on the valve body itself, whereby the spring must be heat-resistant and operate normally at high temperatures (generally below 700°C). The exhaust silencing system includes the valve body and a torsion spring and bushing mounted on the shaft. Under the elastic force of the torsion spring, valve 10 is normally closed. When the exhaust pressure of the range extender increases sufficiently to overcome the pre-elastic force of the torsion spring, valve 10 is opened. A counterweight can also be welded to valve 10 as needed to change the opening time of valve 10. The mass of the counterweight should be determined based on the different exhaust flow rates of each range extender and the actual situation. To eliminate noise generated by the collision between valve 10 and the valve body during opening and closing, wire mesh gaskets are spot-welded to the valve body. Other similar structures based on the same principle can also be used for check valves, such as electronic switches including pressure sensors.

[0037] In some embodiments, the first pipe body 20 is a metal pipe body, including at least one of stainless steel pipe body, aluminized steel pipe body, titanium alloy pipe body, and aluminum alloy pipe body. A first silencing channel 21 is formed by cutting and welding metal sheets. The cross-sectional areas of the first air inlet 23 and the first air outlet 22 of the first silencing channel 21 are smaller than the cross-sectional area of ​​the first silencing channel 21. The first air inlet 23 is connected to the range extender, and the first air outlet 22 can be connected to a downstream muffler or exhaust pipe. The exhaust gas from the range extender enters the first silencing channel 21 through the first air inlet 23 for silencing treatment and is then discharged from the first air outlet 22, thereby reducing the vehicle's NVH performance.

[0038] In some embodiments, the partition 30 is a metal partition 30, including at least one of stainless steel partition 30, aluminized steel partition 30, titanium alloy partition 30, and aluminum alloy partition 30. The first partition 31 and the second partition 32 can be made of the same material or different materials, depending on the actual situation. The partition 30 is cut into a shape that matches the first silencing channel 21 and connected to the first pipe 41 by welding, riveting, or other methods.

[0039] In some embodiments, the exhaust gas from the range extender passes sequentially through the third silencer 35, the second silencer 34, and the first silencer 33 before being discharged from the first outlet 22. The volume of the second silencer 34 is smaller than that of the first silencer 33 and the second silencer 34. The first silencer 33 and the second silencer 34 are connected through the vent 301 of the first partition 31. The second silencer 34 and the third silencer 35 are connected through the valve port 3201 of the second partition 32.

[0040] In some embodiments, the silencing duct 40 is a metal duct, including at least one of stainless steel duct, aluminized steel duct, titanium alloy duct, and aluminum alloy duct. The silencing duct 40 is a long tube, and a plurality of vent holes 50 are formed on the side wall of the silencing duct 40. The silencing duct 40 is connected to the outside of the duct through the vent holes 50, and the exhaust gas is conducted to the silencing channel. The exhaust sound energy is dissipated by the friction between the gas and the vent holes 50.

[0041] In some embodiments, the sound-absorbing medium 42 includes composite fibers, metal wool, etc. Composite fibers and metal wool have high temperature resistance and excellent thermal insulation performance. Composite fibers have a wide sound absorption frequency band, and metal wool has a high sound absorption coefficient. The specific choice depends on the actual situation.

[0042] In some embodiments, the first silencing channel 21 includes a first air inlet 23, and the silencing pipe 40 further includes a second pipe 43. The second pipe 43 is disposed in the third silencing cavity 35 and abuts against the second partition 32. The second pipe 43 connects the first air inlet 23 and the valve port 3201. The first air inlet 23 is disposed on the first pipe body 20 on the side opposite to the first air outlet 22, and the first air inlet 23 connects to the air outlet of the range extender. The second pipe 43 and the third silencing cavity 35 extend in the same direction, and one end of the second pipe 43 abuts against the first air inlet 23, and the other end abuts against the valve port 3201 of the first partition 31. Exhaust gas enters the second pipe 43 from the first air inlet 23. The air passage 50 of the second pipe 43 diffuses the gas into the third silencing cavity 35. The gas dissipates the sound wave energy by friction with the air passage 50. The sound wave continues to be reflected in the third silencing cavity 35. The reflected wave is out of phase with the original sound wave, achieving interference cancellation, thereby achieving a noise reduction effect. Compared to a design where the third silencer chamber 35 does not contain the second pipe 43, this embodiment incorporates the second pipe 43, which allows the vent 50 to further reduce noise, resulting in better noise reduction. In practical implementation, the first silencer 1 without the second pipe 43 and the first silencer 1 with the second pipe 43 can be used in conjunction to enhance noise reduction. For example, the downstream of the range extender can be connected to either the first silencer 1 with or without the second pipe 43, and then connected to the other of the first silencer 1 with or without the second pipe 43, thereby achieving better noise reduction.

[0043] In some embodiments, the exhaust silencing system further includes a second muffler 2, which includes a second pipe body 100 and a third pipe 200. The second pipe body 100 forms a second silencing channel 110 communicating with the first silencing channel 21. The third pipe 200 is disposed in the second silencing channel 110 and extends in the same direction as the second silencing channel 110. The space between the outer wall of the third pipe 200 and the inner wall of the second silencing channel 110 is filled with a silencing medium 42. The second pipe body 100 is a metal pipe body, including at least one of stainless steel pipe body, aluminized steel pipe body, titanium alloy pipe body, and aluminum alloy pipe body. The second silencing channel 110 is formed by cutting and welding metal sheets. The second silencing channel 110 has a second air inlet and a second air outlet, and the cross-sectional area of ​​the second air inlet and the second air outlet is smaller than the cross-sectional area of ​​the second silencing channel 110. The second air intake can be connected to the range extender or the first muffler 1, and the second air outlet can be connected to the downstream muffler or exhaust pipe. Exhaust from the range extender enters the second muffler channel 110 through the second air intake for noise reduction treatment before being discharged from the second air outlet, thereby reducing the vehicle's NVH performance. In practical implementation, the first muffler 1 and the second muffler 2 can be used in conjunction to increase noise reduction. Depending on the actual situation, this may include the following two scenarios:

[0044] In the first specific embodiment, there are two first mufflers 1 and one second muffler 2; the exhaust muffler system includes a first exhaust pipe 311 and a second exhaust pipe 312. The first exhaust pipe 311 extends along a first direction X1, a portion of the second exhaust pipe 312 extends along the first direction X1, and a portion of the second exhaust pipe 312 extends along a second direction X2. The first exhaust pipe 311 connects between two first mufflers 1, and the second exhaust pipe 312 connects between one first muffler 1 and one second muffler 2. The first direction X1 is perpendicular to the second direction X2. Both the first muffler 1 and the second muffler 2 are located on the side of the chassis away from the passenger compartment, or a mounting groove is formed on the chassis, and the first muffler 1 and the second muffler 2 are placed in the mounting groove. The two first mufflers 1 and one second muffler 2 are sequentially connected to the range extender. The two first mufflers 1 can include either a first muffler 1 with a second pipe 43 or a first muffler 1 without a second pipe 43. The exhaust from the range extender sequentially enters the first muffler 1 and the second muffler 2. Through the cooperation of the first mufflers 1 and the second muffler 2, noise of different frequencies (medium, low, and high) can be absorbed respectively, further reducing noise. Specifically, the two first mufflers 1 are located on the side of the battery 3 in the second direction X2, and the second muffler 2 is located on the side of the battery 3 away from the front engine compartment in the first direction X1.

[0045] In the second specific embodiment, there is one first muffler 1 and two second mufflers 2; the exhaust muffler system includes a first bend 321 and a second bend 322. The first bend 321 is connected between the first muffler 1 and one second muffler 2, and the second bend 322 is connected between the two second mufflers 2. The bending angle of the first bend 321 is between 150 degrees and 180 degrees, and the bending angle of the second bend 322 is between 150 degrees and 180 degrees. The first muffler 1 and the second muffler 2 are both located on the side of the chassis away from the passenger compartment, or mounting grooves are formed on the chassis, and the first muffler 1 and the second muffler 2 are placed in the mounting grooves. One first muffler 1 and two second mufflers 2 are sequentially connected to the range extender. One first muffler 1 may include either a first muffler 1 with a second pipe 43 or a first muffler 1 without a second pipe 43. The exhaust from the range extender sequentially enters the first muffler 1 and the second muffler 2. Through the cooperation of the first muffler 1 and the second muffler 2, noise of different frequencies (medium, low, and high) can be absorbed respectively, further reducing noise. Specifically, one first muffler 1 and two second mufflers 2 are both located on the side of the battery 3 away from the front engine compartment in the first direction X1.

[0046] In some embodiments, the diameters of the first pipe body 20 and the second pipe body 100 are between 80 mm and 120 mm, and the lengths of the first pipe body 20 and the second pipe body 100 are between 300 mm and 500 mm; therefore, the volumes of the first muffler 1 and the second muffler 2 are between 1.5 L and 5.5 L. Based on the working principle of the range extender and its commonly used speed range, different muffler modules are matched to the corresponding exhaust noise frequencies, reducing the difficulty of initial layout, mid-term development, and later verification.

[0047] In some embodiments, the first pipe 41, the second pipe 43, and the third pipe 200 are provided with vent holes 50. The first pipe 41 is connected to the first silencing cavity 33 through the vent hole 50, the second pipe 43 is connected to the third silencing cavity 35 through the vent hole 50, and the third pipe 200 is connected to the second silencing channel 110 through the vent hole 50. By providing the vent hole 50, frictional loss with sound waves is increased, thereby reducing noise.

[0048] In some embodiments, the second baffle 32 forms a hole 3202 in the radial direction of the valve port 3201, and the hole 3202 communicates between the second silencing chamber 34 and the third silencing chamber 35. Specifically, the flow rate of the hole 3202 is less than the flow rate of the valve port 3201. When the range extender is at low speed, the valve 10 is slightly open, and most of the gas enters the third silencing chamber 35 through the vent 50 of the second pipe 43 and flows out through the hole 3202 of the baffle 30. Due to the large back pressure of the first silencer 1, low-to-medium frequency exhaust noise can be eliminated. When the range extender is at high speed, the check valve is fully open, and most of the airflow is discharged from the valve 10.

[0049] This application also provides a vehicle including the aforementioned exhaust muffler system. In this application, unless otherwise explicitly specified and limited, the terms "set up (provided)" and "connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0050] In the description of this specification, references to terms such as "some embodiments" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment is included in at least one embodiment of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of those different embodiments or examples.

[0051] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application. Therefore, any changes or modifications made in accordance with the claims and description of this application should fall within the scope of this patent application.

Claims

1. An exhaust silencing system, characterized in that, Includes a first muffler, the first muffler comprising: valve; The first pipe body forms a first silencing channel, and the first silencing channel includes a first air outlet; The partition includes a first partition and a second partition. The first partition and the second partition are spaced apart in the first silencing channel to form a first silencing cavity, a second silencing cavity and a third silencing cavity. The first silencing cavity, the second silencing cavity and the third silencing cavity are arranged sequentially from the direction close to the first air outlet to the direction away from the first air outlet. The first partition forms a vent hole, and the second partition forms a valve port corresponding to the valve. The valve is located at the valve port. The silencing duct includes a first duct, which is disposed in the first silencing cavity and abuts against the first partition. The outer wall of the first duct and the inner wall of the first silencing cavity are filled with a silencing medium. The first duct connects the vent hole and the first air outlet.

2. The exhaust silencing system according to claim 1, characterized in that, The first silencing channel includes a first air inlet, and the silencing pipe also includes a second pipe. The second pipe is disposed in the third silencing cavity and abuts against the second partition. The second pipe connects the first air inlet and the valve port.

3. The exhaust silencing system according to claim 2, characterized in that, The exhaust silencing system further includes a second muffler, which includes a second pipe body and a third pipe. The second pipe body forms a second silencing channel that communicates with the first silencing channel. The third pipe is located in the second silencing channel and extends in the same direction as the second silencing channel. The silencing medium is filled between the outer wall of the third pipe and the inner wall of the second silencing channel.

4. The exhaust silencing system according to claim 3, characterized in that, The diameters of the first tube and the second tube are between 80 mm and 120 mm, and the lengths of the first tube and the second tube are between 300 mm and 500 mm.

5. The exhaust muffler system according to claim 4, characterized in that, The number of the first muffler is two, and the number of the second muffler is one; The exhaust muffler system includes a first exhaust pipe and a second exhaust pipe. The first exhaust pipe extends along a first direction, a portion of the second exhaust pipe extends along the first direction, and a portion of the second exhaust pipe extends along a second direction. The first exhaust pipe connects two first mufflers, and the second exhaust pipe connects one first muffler and one second muffler. The first direction is perpendicular to the second direction.

6. The exhaust silencing system according to claim 4, characterized in that, The number of the first muffler is one, and the number of the second muffler is two; The exhaust muffler system includes a first bend and a second bend. The first bend connects the first muffler and a second muffler, and the second bend connects the two second mufflers. The bending angle of the first bend is between 100° and 150°, and the bending angle of the second bend is between 100° and 150°.

7. The exhaust silencing system according to claim 4, characterized in that, The first pipe, the second pipe, and the third pipe are provided with vent holes. The first pipe is connected to the first silencing cavity through the vent holes, the second pipe is connected to the third silencing cavity through the vent holes, and the third pipe is connected to the second silencing channel through the vent holes.

8. The exhaust muffler system according to claim 7, characterized in that, The second baffle forms a hole in the radial direction of the valve port, and the hole communicates between the second silencing chamber and the third silencing chamber.

9. The exhaust silencing system according to claim 8, characterized in that, The flow rate at the orifice is less than the flow rate at the valve port.

10. A vehicle, characterized in that, Includes the exhaust muffler system as described in any one of claims 1 to 9.

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