Exhaust silencer and vehicle

Abstract

The invention discloses an exhaust silencer and a vehicle. The technical problem that in the prior art, the silencing effect is common is solved. The exhaust silencer comprises a main body, a first silencing material and a second silencing material. The main body is provided with an exhaust channel and a silencing cavity which are arranged in parallel. A communication hole is formed in a part of the exhaust channel and arranged in the radial direction of the exhaust channel, the exhaust channel and the silencing cavity are communicated through the communication hole, and the two ends of the exhaust channel extend to the two opposite end faces of the body respectively. The silencing cavity is filled with the first silencing material. The second silencing material is attached to the inner wall of the part, without the communicating hole, of the exhaust channel. According to the exhaust silencer, the layer of second silencing material is additionally arranged on the inner side wall of the exhaust channel, the silencing effect can be remarkably improved, and therefore noise is reduced.

Description

Technical Field

[0001] This application belongs to the technical field of mufflers, and particularly relates to an exhaust muffler and a vehicle. Background Art

[0002] In a vehicle exhaust system, an exhaust muffler is an important component for reducing exhaust noise and improving the vehicle driving environment. Traditional exhaust mufflers mainly absorb and reflect sound waves by filling sound-absorbing materials in the muffler cavity, so as to achieve the effect of noise reduction. However, the existing mufflers have poor noise reduction effects. Summary of the Invention

[0003] To solve the above technical problems, this application provides an exhaust muffler and a vehicle.

[0004] The technical solution adopted to achieve the purpose of this application is as follows. In the first aspect of this application, the present invention discloses an exhaust muffler, including:

[0005] A main body, the main body is provided with an exhaust passage and a muffler cavity. One part of the exhaust passage is provided with communication holes, and the exhaust passage and the muffler cavity are communicated through the communication holes. Both ends of the exhaust passage extend to two opposite end faces of the main body;

[0006] A first sound-absorbing material, filled in the muffler cavity; and

[0007] A second sound-absorbing material, attached to the inner wall of the part of the exhaust passage where the communication holes are not provided.

[0008] In some embodiments, the main body includes:

[0009] A first housing;

[0010] A second housing, connected to the first housing to enclose a receiving cavity with both ends open;

[0011] A support plate, installed in the receiving cavity to divide the receiving cavity into the muffler cavity and the exhaust passage, and the communication holes are provided on the support plate.

[0012] In some embodiments, both the first housing and the second housing are in a groove shape, the first housing is located above the second housing, and the support plate is connected to the second housing.

[0013] In some embodiments, the second sound-absorbing material is made of a hydrophobic porous material; both the first housing and the second housing are made of polyester plastic.

[0014] In some embodiments, the outlet of the exhaust passage is flush with the bottom wall of the exhaust port or the outlet of the exhaust passage is higher than the bottom wall of the exhaust port.

[0015] In some embodiments, a plurality of communication holes are provided, and the projections of the plurality of communication holes along the direction perpendicular to the support plate are uniformly arranged; the shapes and sizes of the projections of the respective communication holes along the direction perpendicular to the support plate are the same.

[0016] In some embodiments, the support plate is provided with a first exhaust groove, and both ends of the first exhaust groove respectively extend to two opposite end faces of the support plate;

[0017] The second housing is provided with a second exhaust groove, the extending shape of the second exhaust groove is adapted to that of the first exhaust groove, and the second exhaust groove and the first exhaust groove are opposite in notch to form the exhaust passage.

[0018] In some embodiments, the support plate is a perforated plate, and the perforated plate is stamped along the direction perpendicular to its plate surface to form the first exhaust groove; the extending shape of the first exhaust groove is curved.

[0019] In some embodiments, the main body is provided with an air inlet and an air outlet communicating with the exhaust passage, the air inlet and the air outlet are respectively located at two ends of the exhaust passage, and the diameters of the air inlet and the air outlet are both smaller than the diameter of the exhaust passage.

[0020] The technical solution adopted to achieve the purpose of the present application is that in the second aspect of the present application, the present invention also discloses a vehicle, including the exhaust muffler described in the first aspect above.

[0021] As can be seen from the first technical solution, the exhaust muffler disclosed in the present application includes a main body, a first sound-absorbing material, and a second sound-absorbing material. The main body is provided with an exhaust passage and a sound-absorbing cavity arranged in parallel. A part of the region of the exhaust passage is provided with communication holes, the communication holes are arranged along the radial direction of the exhaust passage, the exhaust passage and the sound-absorbing cavity are communicated through the communication holes, and both ends of the exhaust passage respectively extend to two opposite end faces of the main body. The first sound-absorbing material is filled in the sound-absorbing cavity. The second sound-absorbing material is attached to the inner wall of the part of the exhaust passage where no communication holes are provided. By adding a layer of second sound-absorbing material to the inner wall of the exhaust passage, the noise reduction effect of the exhaust muffler can be further improved, thereby improving the sound absorption effect.

[0022] The present application has at least the following beneficial effects or advantages: The exhaust muffler disclosed in the present application has a simple structure and a remarkable noise reduction effect. By reasonably arranging the exhaust passage, the sound-absorbing cavity, the communication holes, and the sound-absorbing material, the effective control of exhaust noise is achieved. Compared with the existing mufflers, the present application has a better sound absorption and noise reduction effect by attaching a layer of second sound-absorbing material in the exhaust passage. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1 Structural schematic diagram of the exhaust muffler in one or more embodiments of the present application;

[0025] Figure 2 is Figure 1 side view of;

[0026] Figure 3 is Figure 2 A-A sectional view of;

[0027] Figure 4 is Figure 2 top view sectional schematic diagram of;

[0028] Figure 5 is Figure 1 schematic diagram of the support plate of the exhaust muffler of.

[0029] Explanation of reference numerals:

[0030] 1000 - Exhaust muffler, 100 - Main body, 110 - First housing, 120 - Second housing, 121 - Second exhaust groove, 130 - Air inlet, 140 - Exhaust port, 150 - Low connection bracket, 160 - High connection bracket, 170 - Support plate, 171 - First exhaust groove, 180 - Accommodation cavity, 181 - Exhaust passage, 182 - Muffling cavity, 190 - Communication hole, 200 - First sound-absorbing material, 300 - Second sound-absorbing material. Detailed implementation manners

[0031] To enable those skilled in the art in the technical field to which the present application belongs to better understand the present application, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0032] In addition, this application may repeat reference numerals and / or reference letters in different instances. This repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or arrangements discussed. In addition, this application provides examples of various specific processes and materials, but those of ordinary skill in the art may be aware of the application of other processes and / or the use of other materials.

[0033] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments may be combined with each other.

[0034] An embodiment of the present invention discloses an exhaust muffler 1000, which can solve the technical problem of poor noise reduction effect of the existing muffler, so as to achieve the effect of noise reduction. The technical solution of this application will be introduced in detail through specific embodiments below:

[0035] Refer to Figure 1 、 Figure 2 and Figure 3 , in the first aspect embodiment of this application, there is provided an exhaust muffler 1000, which includes a main body 100, a first sound-absorbing material 200, and a second sound-absorbing material 300. The main body 100 is provided with an exhaust passage 181 and a sound-absorbing cavity 182 arranged in parallel. A communication hole 190 is provided in a part of the region of the exhaust passage 181. The communication hole 190 is arranged along the radial direction of the exhaust passage 181. The exhaust passage 181 and the sound-absorbing cavity 182 are communicated through the communication hole 190. The two ends of the exhaust passage 181 respectively extend to two opposite end faces of the main body 100. The first sound-absorbing material 200 is filled in the sound-absorbing cavity 182. The second sound-absorbing material 300 is attached to the inner wall of the part of the exhaust passage 181 where the communication hole 190 is not provided. By adding a layer of the second sound-absorbing material 300 to the inner wall of the exhaust passage 181, the noise reduction effect of the exhaust muffler 1000 can be further improved, thereby improving the sound absorption effect.

[0036] The main body 100 is a container with a specific shape and structure, and an exhaust passage 181 and a muffling chamber 182 are provided inside it. The exhaust passage 181 is the main path for gas discharge, and its two ends respectively extend to two opposite end faces of the main body 100 for connecting a gas discharge device and the external environment. In a part of the area of the exhaust passage 181, communication holes 190 are provided, and these communication holes 190 connect the exhaust passage 181 with the muffling chamber 182, allowing part of the gas to enter the muffling chamber 182 for noise reduction treatment. The first muffling material 200 is filled in the muffling chamber 182 and is a highly efficient sound wave absorption material, which can absorb the sound wave energy generated by the gas entering the muffling chamber 182, thereby reducing the noise level. This material usually has a porous structure and can effectively convert sound waves into heat energy or other forms of energy. The second muffling material 300 is attached to the inner wall of the part of the exhaust passage 181 where the communication holes 190 are not provided. It can reflect sound waves, reduce the direct propagation of sound waves in the exhaust passage 181, and thus reduce the noise propagation efficiency. At the same time, the second muffling material 300 can also provide a certain heat insulation effect, reducing the heat radiation of the high-temperature gas in the exhaust passage 181 to the muffler housing.

[0037] In one embodiment, the main body 100 includes a first housing 110, a second housing 120, and a support plate 170. The second housing 120 is connected to the first housing 110 to enclose a receiving cavity 180 that is open at both ends. The support plate 170 is installed in the receiving cavity 180 to divide the receiving cavity 180 into a muffling chamber 182 and an exhaust passage 181, and the communication holes 190 are provided on the support plate 170.

[0038] The shape and size of the support plate 170 are customized according to the overall design and noise reduction requirements of the exhaust muffler 1000. It can be flat, wavy or other complex shapes to better adapt to the internal structure of the receiving cavity 180 and optimize the gas flow path. The size of the support plate 170 is usually matched with the size of the receiving cavity 180 to ensure that it can be tightly installed therein to prevent gas leakage. The number, position and size of the communication holes 190 are carefully designed to ensure that the gas can be evenly distributed into the muffling chamber 182, thereby improving the noise reduction effect. The communication holes 190 are usually circular, oval or other regular shapes, and can be processed by perforation, punching or laser cutting according to needs.

[0039] In one embodiment, refer to Figure 1 Figure, the first housing 110 and the second housing 120 are both in a groove shape, the first housing 110 is located above the second housing 120, and the support plate 170 is connected to the second housing 120. The first housing 110 and the second housing 120 are both in a groove shape design, which greatly reduces the volume of the entire muffler, greatly reducing the volume and weight of the muffler and facilitating installation and carrying.

[0040] A part of the outer surface of the first housing 110 is an inclined surface, and the included angle between the inclined surface part and the flat surface part is 190 degrees to 175 degrees, such as 155 degrees, 130 degrees, 165 degrees or 140 degrees, etc. When installing the exhaust muffler on a vehicle, since the vehicle chassis is usually not in a flat state, the inclined surface can fit with the chassis, so as to ensure that the position below the first housing 110 is in a horizontal state after it is connected to the vehicle chassis. Of course, setting the inclined surface for avoidance is only one implementation manner in this embodiment. In other implementation manners, according to the shape of the vehicle chassis and the installation structure, the external shape of the first housing 110 can be adaptively deformed or the structure can be adjusted. For example, it is also possible to set the avoidance structure of the first housing 110 as an avoidance groove or a notch and other structures.

[0041] A low connection bracket 150 and a high connection bracket 160 are also provided on the first housing 110. The height of the high connection bracket 160 is higher than that of the low connection bracket 150. The first housing 110 is connected to the vehicle chassis through the low connection bracket 150 and the high connection bracket 160, and can form a cooperation with the inclined surface to ensure that the first housing 110 is horizontally arranged. The low connection bracket 150 and the high connection bracket 160 are respectively located at opposite ends of the first housing 110, and the end surfaces where the low connection bracket 150 and the high connection bracket 160 are located correspond to the end surface where the opening of the exhaust passage 181 is located. Among them, the number of the low connection bracket 150 and the high connection bracket 160 can be arranged according to the structure of the vehicle chassis. For example, both the low connection bracket 150 and the high connection bracket 160 can be set to two or more.

[0042] The second housing 120 is located below the first housing 110. A fixed-size connection can be formed between the second housing 120 and the first housing 110 by means of hot melt connection, snap connection or bonding, etc. For example, a protruding part with a groove protruding outward can be provided on the top of the second housing 120, and a clamping part protruding outward and having a downward protrusion can be provided on the bottom of the first housing 110. The clamping part is clamped in the groove to connect the second housing 120 and the first housing 110.

[0043] The height of the second housing 120 is greater than the height of the first housing 110. After the second housing 120 and the first housing 110 are connected to form the accommodation cavity 180, the support plate 170 is connected to the second housing 120 to divide it into a muffler cavity 182 and an exhaust passage 181.

[0044] In one embodiment, the second sound-absorbing material 300 is made of a porous material with hydrophobicity, such as polyester fiber with a relatively high density. In this embodiment, the second sound-absorbing material 300 generally uses polyester fiber with a density range generally between 1.38 and 1.45 g / cm³, such as cotton fiber (about 1.5 g / cm³) or wool (about 1.32 g / cm³), etc. The second sound-absorbing material 300 can not only reflect sound waves but also allow water to flow in the second sound-absorbing material 300. Utilizing this property, the exhaust muffler 1000 disclosed in this embodiment does not need to additionally provide drainage holes. After the water vapor in the tail gas condenses into water, it can directly flow in the second sound-absorbing material 300. For example, when the tail gas flows, due to the relatively fast air flow velocity, the water in the air flow can flow out quickly from below the flow channel under the action of gravity and gas pushing without the need to set drainage holes. Since no drainage holes are provided, it avoids the reduction of the muffling performance of the muffler and energy leakage caused by the drainage holes.

[0045] The first sound-absorbing material 200 can also be made of polyester fiber with a relatively high density and hydrophobicity, which can reduce the influence of water on the first sound-absorbing material 200. The same as the second sound-absorbing material 300, in this embodiment, the first sound-absorbing material 200 also generally uses polyester fiber with a density range generally between 1.38 and 1.45 g / cm³, such as cotton fiber (about 1.5 g / cm³) or wool (about 1.32 g / cm³), etc. In this embodiment, the first sound-absorbing material 200 can be made of the same material or different materials.

[0046] The sound-absorbing effect of polyester fiber with a certain hydrophobicity and relatively high density is usually better in the range of 500 Hz - 4000 Hz, which is suitable for the exhaust noise condition of fuel cell vehicles. Sound-absorbing materials include porous materials and fiber materials, such as glass fiber, rock wool or foam plastic, etc. The above materials all have open pores, and the size is usually less than a few millimeters, which is much smaller than the sound wave wavelength. Due to the action of sound waves, the air molecules in the pores of the material vibrate at the frequency excited by the sound waves, resulting in frictional losses and converting sound energy into heat energy. In addition, the change in the flow direction and the expansion and contraction of air passing through irregular pores lead to momentum losses in the direction of sound wave propagation. These two phenomena are the main reasons for the high-frequency sound energy loss in sound-absorbing materials. This kind of muffler using sound-absorbing materials has a better muffling effect on medium- and high-frequency noises.

[0047] The first housing 110, the second housing 120, and the support plate 170 can all be made of polyester plastic, which has the advantages of high strength, corrosion resistance, high temperature resistance, and light weight. Compared with the currently common fuel cell exhaust muffler 1000 made of steel, the elastic modulus and density of the polyester plastic material are relatively low, and its vibration transmission and energy loss are relatively small, so the generated noise is also relatively small.

[0048] In one embodiment, Figure 2 , Figure 3 and Figure 4 , the main body 100 is provided with an air inlet 130 and an air outlet 140 that communicate with the exhaust passage 181. The air inlet 130 is located at one end of the main body 100 where the low connection bracket 150 is provided, and the air outlet is located at one end of the main body 100 where the high connection bracket 160 is provided. The air inlet 130 and the air outlet 140 are respectively located at both ends of the exhaust passage 181, and the diameters of the air inlet 130 and the air outlet 140 are both smaller than the diameter of the exhaust passage 181. The air inlet 130 and the exhaust passage 181 adopt a variable diameter design method, which can improve the airflow characteristics. The expansion of the pipe diameter increases the time and distance for the sound wave to bounce inside the pipe wall, resulting in greater energy loss, making the sound wave more easily absorbed by the sound-absorbing material in the sound-absorbing cavity 182, improving the sound-absorbing effect to a certain extent and enhancing the adaptability of the muffler. At the same time, since the diameter change is small, no large back pressure will be generated. The diameter of the air outlet 140 being smaller than the diameter of the exhaust passage 181 helps to reduce the turbulence and eddy current of the airflow at the outlet, further reducing the noise and preventing rainwater or dirt from entering the interior of the muffler.

[0049] In one embodiment, the outlet of the exhaust passage 181 is flush with the bottom wall of the air outlet 140 or the outlet of the exhaust passage 181 is higher than the bottom wall of the air outlet 140. This design can make it more convenient for water to drain from the exhaust passage 181, avoiding water accumulation in the exhaust passage 181, thereby avoiding affecting the sound-absorbing effect of the second sound-absorbing material 300.

[0050] In one embodiment, a plurality of communication holes 190 are provided, and the projections of the plurality of communication holes 190 along the direction perpendicular to the support plate 170 are uniformly arranged. The shapes and sizes of the projections of the respective communication holes 190 along the direction perpendicular to the support plate 170 are the same.

[0051] The communication holes 190 penetrate through the support plate 170 along the thickness direction of the support plate 170, and the communication holes 190 are perpendicular to the support plate 170. The plurality of communication holes 190 can increase the contact area between the sound-absorbing cavity 182 and the exhaust passage 181, thereby increasing the contact area between the first sound-absorbing material 200 and the airflow in the exhaust passage 181, which is beneficial to improving the sound-absorbing effect. The plurality of communication holes 190 that are evenly distributed and have exactly the same shape and size can make the fluid more evenly distributed when passing through the support plate 170, avoiding the situation of too high or too low local flow velocity, and the evenly distributed communication holes 190 help to reduce the residence time of the fluid on the support plate 170 and improve the overall flow efficiency.

[0052] In addition, by uniformly distributing a plurality of communication holes 190 on the support plate 170, the weight of the support plate 170 can be reduced without sacrificing too much structural strength. The uniformly distributed communication holes 190 can also reduce stress concentration, making the support plate 170 more stable when bearing external forces.

[0053] In one embodiment, the communication holes 190 can be set to be circular. The circular communication holes 190 are more convenient for processing and production, and they can make the distribution on the support plate 170 more uniform. Of course, setting the communication holes 190 to be circular is only one implementation manner in this embodiment. In other implementation manners, it is also possible to set the communication holes 190 to be elliptical or polygonal shapes, etc.

[0054] In one embodiment, refer to Figure 2 、 Figure 4 and Figure 5 The support plate 170 is provided with a first exhaust groove 171, and both ends of the first exhaust groove 171 extend to two opposite end faces of the support plate 170. The second housing 120 is provided with a second exhaust groove 121, and the extending shape of the second exhaust groove 121 is adapted to that of the first exhaust groove 171. The second exhaust groove 121 and the first exhaust groove 171 are opposite in notch to form an exhaust passage 181.

[0055] The first exhaust groove 171 communicates with the sound absorption cavity 182 through the communication holes 190. The second sound absorption material 300 is attached to the inner wall of the second exhaust groove 121, and the second sound absorption material 300 can be connected to the inner wall of the second exhaust groove 121 by means of pasting or the like. The first exhaust groove 171 and the second exhaust groove 121 are opposite in notch to form an exhaust passage 181. After the air flow enters the exhaust passage 181, a part of the air flow enters the sound absorption material through the communication holes 190 on the groove wall of the first exhaust groove 171. This part of the air flow is subjected to sound absorption treatment after entering the first sound absorption material 200; when the other part of the air flow flows in the second exhaust groove 121, it acts on the second sound absorption material 300 to reduce noise.

[0056] Among them, the specific shapes of the first exhaust groove 171 and the second exhaust groove 121 are not limited in this embodiment. Therefore, both the first exhaust groove 171 and the second exhaust groove 121 can be set to be circular, elliptical or rectangular shapes, etc., or the first exhaust groove 171 is set to be circular while the second exhaust groove 121 is set to be rectangular.

[0057] This embodiment also does not limit the sizes of the first exhaust groove 171 and the second exhaust groove 121. For example, it is possible to make the sizes of the first exhaust groove 171 and the second exhaust groove 121 equal or one of them is larger than the other.

[0058] For example, the first exhaust slot 171 and the second exhaust slot 121 can both be set to have a semi-elliptical shape. When the openings of the first exhaust slot 171 and the second exhaust slot 121 face each other, an exhaust passage 181 with an elliptical cross-section can be formed. The convergence characteristics of the elliptical line cause the airflow to converge and squeeze against the rising edge of the line under the shearing action, which helps to form a stronger airflow within the exhaust passage 181, thereby improving the exhaust efficiency. The open structure of the elliptical line results in less resistance for the gas to flow into the slot, which helps the gas to smoothly pass through the exhaust passage 181 and further improves the exhaust efficiency. The design of the elliptical exhaust passage 181 can be adjusted and changed according to specific requirements to adapt to different emission requirements. For example, the cross-sectional area of the passage can be adjusted by changing the lengths of the major and minor axes of the ellipse to meet different exhaust volume requirements.

[0059] In one embodiment, the support plate 170 is a perforated plate, and the perforated plate is stamped in a direction perpendicular to its plate surface to form the first exhaust slot 171. Stamping is a technique widely used in metal processing. By applying pressure to a metal plate with a die, the metal plate is deformed to achieve the desired shape and size. The support plate 170 obtained in this way can ensure that the size of the projection of the connection holes thereon in a direction perpendicular to the support plate 170 does not change, thereby ensuring that the shapes and sizes of the projections of the respective communication holes 190 in a direction perpendicular to the support plate 170 are the same. The uniformly distributed communication holes 190 can be produced using standardized manufacturing processes, improving production efficiency and consistency.

[0060] During the stamping process, the perforated plate is processed to form the first exhaust slot 171. This slot is not simply formed by cutting or drilling, but rather the structure of the perforated plate itself is changed through the stamping process to give it a specific shape and depth.

[0061] The extending shape of the first exhaust slot 171 is curved to increase the contact area and contact time between the airflow and the first sound-absorbing material 200 and the second sound-absorbing material 300, which can further increase the sound absorption and noise reduction effect.

[0062] In one embodiment, the shape of the first exhaust slot 171 is set to an S shape. Based on this, since the second exhaust slot 121 is adapted to the shape of the first exhaust slot 171, the second exhaust slot 121 also extends in an S shape, and thus the exhaust passage 181 is also in an S shape. The extending shape of the first exhaust slot 171 can directly determine the extending shape of the exhaust passage 181. Setting the first exhaust slot 171 to an S shape is only one implementation manner in this embodiment. In other implementation manners, it is also possible to set the first exhaust slot 171 to a curved shape with more bending portions.

[0063] Through the above embodiments, the present application has the following beneficial effects or advantages:

[0064] 1. The exhaust muffler 1000 disclosed in this application has a simple structure and remarkable noise reduction effect. By reasonably setting the exhaust passage 181, the muffler chamber 182, the communication holes 190 and the sound-absorbing material, the effective control of the exhaust noise is achieved. A pure resistive design scheme is adopted. Compared with the common reactive mufflers used in fuel cell vehicles at present, the pure reactive muffler does not have problems such as complex structure and contradiction between the sound absorption effect and the exhaust back pressure. Compared with the common straight-through resistive muffler, the fuel cell exhaust muffler 1000 provided by the present invention has a better sound absorption effect. In order to increase the contact area and contact time between the air flow and the first sound-absorbing material 200 and the second sound-absorbing material 300, an S-shaped exhaust passage 181 is designed. A large amount of the first sound-absorbing material 200 is arranged above the exhaust passage 181 and separated by the round hole support plate 170. Both the first sound-absorbing material 200 and the second sound-absorbing material 300 are made of polyester fiber with a relatively high density, and their sound absorption effect is usually better in the range of 500 Hz - 4000 Hz, which is suitable for the exhaust noise condition of the fuel cell. A little of the second sound-absorbing material 300 is arranged on the inner wall below the exhaust passage 181 to increase the sound absorption effect. The second sound-absorbing material 300 below is thinner and it is experimentally found that it has certain hydrophobic properties and the flow velocity of the tail exhaust gas is relatively large. Therefore, the moisture in the air flow can flow out quickly from below the exhaust passage 181 under the action of gravity and gas pushing, reducing the influence of water on the second sound-absorbing material 300. Such a design can increase the residence time of the air flow, increase the contact area and contact time between the gas in the muffler and the first sound-absorbing material 200 and the second sound-absorbing material 300, and has good transmission loss effect and insertion loss effect.

[0065] 2. Since the first housing 110, the second housing 120 and the support plate 170 are all made of polyester plastic, compared with the common fuel cell exhaust muffler 1000 made of steel at present, the elastic modulus and density of the polyester plastic material are relatively low, its vibration transmission and energy loss are relatively small, and thus the generated noise is also relatively small.

[0066] 3. The diameters of the air inlet 130 and the exhaust outlet 140 are smaller than the diameter of the S-shaped exhaust passage 181. By adopting a variable diameter setting method, the air flow characteristics can be improved. The expansion of the pipe diameter increases the time and distance for the sound wave to rebound inside the pipe wall, resulting in greater energy loss, making the sound wave easier to be absorbed by the sound-absorbing material in the muffler chamber 182, improving the sound absorption effect to a certain extent and enhancing the adaptability of the muffler; at the same time, since the diameter change is small, no large back pressure will be generated.

[0067] 4. Guide and drain the water in the exhaust gas through the second sound-absorbing material 300, avoiding opening drainage holes on the main body 100, which can further improve the sound absorption and noise reduction effect. Due to the relatively high air flow speed, the moisture in the air flow can flow out quickly from below the exhaust passage 181 under the action of gravity and gas propulsion, reducing the impact of water on the performance of the second sound-absorbing material 300. The unique drainage method does not require additional drainage holes, avoiding the reduction of the sound absorption performance of the muffler and energy leakage caused by the drainage holes.

[0068] Based on the same inventive concept, the second aspect of the present application discloses a vehicle, which includes the exhaust muffler 1000 of any embodiment of the first aspect above. The main body 100 is connected to the vehicle chassis, and the exhaust passage 181 is communicated with the vehicle exhaust pipe.

[0069] The vehicle disclosed in this embodiment uses the above exhaust muffler 1000 to process the exhaust noise. During the driving of the vehicle, it has lower noise, which can not only reduce the impact on the surrounding environment, but also reduce the impact on the interior of the vehicle, thereby improving the driving experience.

[0070] In one embodiment, the vehicle is a fuel cell vehicle.

[0071] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0072] Therefore, the detailed description of the embodiments of the present invention provided in the accompanying drawings for the first time is not intended to limit the scope of the claimed invention, but merely represents the selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0073] It should be noted that similar reference numerals and letters indicate similar items in the drawings on the second side. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0074] In the description of the present invention, it should be understood that the terms indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0075] In the present invention, unless otherwise clearly specified or limited, terms such as "installed", "connected", "joined", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0076] In the present invention, unless otherwise clearly specified or limited, the first feature being on the first or second of the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being on the first, first side and first face of the second feature includes the first feature being directly on the first side and obliquely on the first side of the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. The first feature being on the second, second side and second face of the second feature includes the first feature being directly on the second side and obliquely on the second side of the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0077] Although the preferred embodiments of the present application have been described, those of ordinary skill in the art can make additional changes and modifications once they learn the basic creative concept. Therefore, the appended claims are intended to be construed as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0078] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application is also intended to include these changes and modifications.

Claims

1. An exhaust muffler, characterized in that, Comprising: A main body, the main body is provided with an exhaust passage and a sound absorption cavity, a part of the area of the exhaust passage is provided with communication holes, the exhaust passage and the sound absorption cavity are communicated through the communication holes, and both ends of the exhaust passage extend to two opposite end faces of the main body; A first sound absorption material, filled in the sound absorption cavity; And A second sound absorption material, attached to the inner wall of the part of the exhaust passage where the communication holes are not provided.

2. The exhaust muffler according to claim 1, characterized in that, The main body includes: A first housing; A second housing, connected to the first housing to enclose a receiving cavity with both ends open; A support plate, installed in the receiving cavity to divide the receiving cavity into the sound absorption cavity and the exhaust passage, and the communication holes are provided on the support plate.

3. The exhaust muffler according to claim 2, characterized in that, Both the first housing and the second housing are in a groove shape, the first housing is located above the second housing, and the support plate is connected to the second housing.

4. The exhaust muffler according to claim 2, characterized in that, The communication holes are provided in multiple numbers, and the projections of the multiple communication holes along the direction perpendicular to the support plate are evenly arranged; the shapes and sizes of the projections of each communication hole along the direction perpendicular to the support plate are the same.

5. The exhaust muffler according to claim 2, characterized in that, The support plate is provided with a first exhaust groove, and both ends of the first exhaust groove extend to two opposite end faces of the support plate; The second housing is provided with a second exhaust groove, the extending shape of the second exhaust groove is adapted to that of the first exhaust groove, and the second exhaust groove and the first exhaust groove are opposite in notch to form the exhaust passage.

6. The exhaust muffler according to claim 5, characterized in that, The support plate is a perforated plate, and the perforated plate is stamped along the direction perpendicular to its plate surface to form the first exhaust groove; the extending shape of the first exhaust groove is curved.

7. The exhaust muffler according to any one of claims 1 to 6, characterized in that, The second sound absorption material is made of a porous material with hydrophobicity; the main body is made of polyester plastic.

8. The exhaust muffler according to claim 7, characterized in that, The main body is provided with an air inlet and an air outlet communicated with the exhaust passage, the air inlet and the air outlet are respectively located at both ends of the exhaust passage; the outlet of the exhaust passage is flush with the bottom wall of the air outlet or the outlet of the exhaust passage is higher than the bottom wall of the air outlet.

9. The exhaust muffler according to claim 8, characterized in that, The diameters of both the air inlet and the air outlet are smaller than the diameter of the exhaust passage.

10. A vehicle, characterized in that, Comprising the exhaust muffler according to any one of claims 1 to 9.

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