Exhaust noise reduction device and vehicle

Abstract

The present invention relates to an exhaust noise reduction device and a vehicle. The exhaust noise reduction device includes a shell, a cylinder, a tail cover, an air intake pipe, and an exhaust pipe. The tail cover is provided at one end of the shell, and the inner diameter of the tail cover gradually decreases in a direction away from the shell to form a funnel-shaped airflow channel. The exhaust noise reduction device and the vehicle are used to reduce the noise generated by gas vibration during exhaust. The cross-sectional area of ​​the channel through which the sound wave passes when it propagates at various locations inside the exhaust noise reduction device will undergo a sudden change, thereby causing reflection and interference of the sound wave to achieve a sound elimination effect. The inner diameter of the tail cover gradually decreases in a direction away from the shell, so that the tail cover protrudes from the shell and cooperates with the exhaust pipe to form a funnel-shaped airflow channel. The airflow can converge toward the exhaust pipe along the inner wall of the funnel-shaped tail cover, thereby avoiding the high-frequency aerodynamic noise caused by the reflection of the gas in the tail cover when the airflow enters the tail cover to form a vortex, thereby effectively reducing the exhaust aerodynamic noise.

Description

Technical Field

[0001] The present invention relates to the technical field of sound processing, and in particular to an exhaust noise reduction device and a vehicle. Background Art

[0002] When the engines of mechanical equipment such as motorcycles and automobiles are running, exhaust gases generated by combustion flow out of the engine exhaust port. As the exhaust gases flow through the exhaust pipe, they cause air vibrations, which are then treated by exhaust noise reduction devices. Existing exhaust noise reduction devices must meet the vehicle's power requirements, meet statutory noise standards, and meet user expectations for exhaust sound quality. However, traditional exhaust noise reduction devices struggle to effectively eliminate exhaust aerodynamic noise. Summary of the Invention

[0003] Based on this, it is necessary to provide an exhaust noise reduction device to address the problem that existing exhaust noise reduction devices are difficult to effectively eliminate exhaust aerodynamic noise.

[0004] The technical solution is as follows:

[0005] An exhaust noise reduction device includes a shell, a cylinder, a tail cover, an intake pipe and an exhaust pipe, the cylinder being arranged in the shell, one end of the tail cover being connected to one end of the shell, the inner diameter of the tail cover gradually decreasing in a direction away from the shell, the intake pipe extending to the other end of the shell, and the exhaust pipe being connected to the other end of the tail cover to form a funnel-shaped airflow channel.

[0006] The technical solution is further described below:

[0007] In one embodiment, the tail cover includes an inner bending portion and an outer bending portion, one end of the inner bending portion is connected to the cylinder, and the other end of the inner bending portion is connected to the exhaust pipe, one end of the outer bending portion is connected to the shell, and the other end of the outer bending portion is connected to the exhaust pipe, and an insulating space is formed between the inner bending portion and the outer bending portion.

[0008] In one embodiment, the exhaust noise reduction device includes a silencer pipe, and the silencer pipe is arranged in the cylinder.

[0009] In one embodiment, the exhaust noise reduction device includes a first partition and a second partition, the cylinder is provided with an installation cavity, the first partition and the second partition are arranged at intervals in the installation cavity, the first partition and the second partition divide the installation cavity into a first expansion cavity, a second expansion cavity and a blind cavity located between the first expansion cavity and the second expansion cavity, the silencer is arranged in the blind cavity, one end of the silencer passes through the first partition and extends to the first expansion cavity, and the other end of the silencer passes through the second partition and extends to the second expansion cavity.

[0010] In one embodiment, the number of the silencer pipes is at least two, and all the silencer pipes are distributed in the cylinder at intervals.

[0011] In one embodiment, the length of the muffler tube is set to an odd multiple of a quarter wavelength of the sound wave to be eliminated.

[0012] In one embodiment, the exhaust noise reduction device includes a protective cover, one end of the protective cover is connected to an end of the shell close to the intake pipe, the other end of the protective cover is used to connect to the engine, and the protective cover is sleeved on the intake pipe.

[0013] In one embodiment, the inner diameter of the protective cover gradually decreases in a direction away from the cylinder.

[0014] In one embodiment, the exhaust noise reduction device includes a third partition, which is arranged at one end of the protective cover close to the cylinder and connected to the protective cover. The third partition is provided with an avoidance hole for the intake pipe to pass through.

[0015] In another aspect, a vehicle is provided. The vehicle includes an engine and the exhaust noise reduction device, wherein the engine is connected to the exhaust noise reduction device.

[0016] The exhaust noise reduction device and vehicle described above are used to reduce the noise generated by gas vibration during exhaust. After passing through the intake pipe, cylinder, tail hood, and other structures, the gas is discharged from the exhaust pipe. Due to the varying diameters of the gas flow paths, the cross-sectional area of ​​the channels through which sound waves propagate within the exhaust noise reduction device undergoes sudden changes, causing reflection and interference of the sound waves to achieve a sound-absorbing effect. The inner diameter of the tail hood gradually decreases as it moves away from the housing, causing the tail hood to protrude from the housing and form a funnel-shaped airflow channel in conjunction with the exhaust pipe. Airflow can flow along the inner wall of the funnel-shaped tail hood toward the exhaust pipe, thereby preventing the formation of vortices within the tail hood upon reflection of the airflow entering the tail hood, which could cause high-frequency aerodynamic noise. This effectively reduces exhaust aerodynamic noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 Schematic diagram of the overall structure of an exhaust noise reduction device according to an embodiment of the present invention;

[0020] Figure 2 for Figure 1 A cross-sectional view of an exhaust noise reduction device;

[0021] Figure 3 for Figure 1 A schematic diagram of the overall structure of the exhaust noise reduction device from another angle;

[0022] Figure 4 This is a schematic diagram of the internal flow field distribution obtained from testing of an exhaust noise reduction device in the prior art;

[0023] Figure 5 for Figure 1 Schematic diagram of the internal flow field distribution obtained from the exhaust noise reduction device test;

[0024] Figure 6 This is a schematic diagram of power distribution obtained from testing an exhaust noise reduction device in the prior art;

[0025] Figure 7 for Figure 1 Schematic diagram of the power distribution obtained from the exhaust noise reduction device test.

[0026] Description of reference numerals:

[0027] 100. Shell; 200. Cylinder; 210. First expansion chamber; 220. Blind cavity; 230. Second expansion chamber; 300. Inlet pipe; 310. Exhaust pipe; 400. Tail cover; 410. Inner bend; 420. Outer bend; 500. Silencer; 600. First partition; 610. Second partition; 620. Third partition; 700. Protective cover. DETAILED DESCRIPTION

[0028] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0029] As described in the background art, when the engine of a vehicle, automobile, or other mechanical equipment is running, exhaust gas generated by engine combustion flows out of the engine exhaust port. The exhaust gas circulates within the exhaust pipe and flows toward the exhaust noise reduction device. Existing exhaust noise reduction devices typically have a flat or concave tail shroud. However, both types of structures share a common disadvantage: the airflow entering the tail chamber is easily reflected by the flat or concave tail shroud, forming strong vortices. These vortices generate high-frequency aerodynamic noise that is dissipated through the exhaust pipe, significantly reducing the device's exhaust noise reduction effectiveness and the quality of the exhaust sound. To address this issue, conventional technologies offer two solutions: one is to lay resistive muffler cotton on the inner wall of the muffler to hinder gas movement and absorb high-frequency noise. However, this solution is relatively complex and increases the overall cost of the device. The other is to shorten the exhaust pipe to enhance the sense of acceleration and power of the exhaust sound. However, while maintaining the tail pipe outlet position and the tail pipe length outside the muffler barrel unchanged, shortening the tail pipe for both flat and concave tail shrouds is difficult to achieve in order to improve exhaust sound quality. Therefore, it is difficult for conventional exhaust noise reduction devices to effectively eliminate exhaust aerodynamic noise.

[0030] To solve the above problems, Figures 1 to 3 As shown, in one embodiment, an exhaust noise reduction device is provided, which includes a shell 100, a cylinder 200, a tail cover 400, an intake pipe 300 and an exhaust pipe 310. The cylinder 200 is arranged in the shell 100, one end of the tail cover 400 is connected to one end of the shell 100, and the inner diameter of the tail cover 400 gradually decreases in the direction away from the shell 100. The intake pipe 300 extends to the other end of the shell 100, and the exhaust pipe 310 is connected to the other end of the tail cover 400 to form a funnel-shaped airflow channel.

[0031] The exhaust pipe 310 can be fixedly connected to the tail hood 400 to prevent separation of the exhaust pipe 310 and tail hood 400 during vehicle operation, thereby reducing the noise reduction effect of the exhaust noise reduction device. Furthermore, the fixed connection can include, but is not limited to, threaded connections, keyed connections, adhesive bonding, welding, and other connection methods, as long as the exhaust pipe 310 and tail hood 400 are relatively fixed.

[0032] Among them, the air intake pipe 300 and the exhaust pipe 310 can be detachably connected to the shell 100, and the part of the air intake pipe 300 extending into the cylinder 200, the cylinder 200, the exhaust pipe 310, the muffler 500 and the part of the exhaust pipe 310 penetrating into the cylinder 200 can be coaxially arranged, thereby facilitating the disassembly and assembly of the device.

[0033] The housing 100 may be provided with a plurality of water leakage holes, so that the water leakage holes can discharge the water vapor infiltrated by the exhaust pipe 310, thereby preventing the device from being rusted due to condensation of water vapor inside the housing 100.

[0034] The exhaust noise reduction device and vehicle are used to reduce the noise generated by gas vibration during exhaust. Gas passes through the intake pipe 300, the cylinder 200, the tail hood 400, and other structures before being discharged from the exhaust pipe 310. Due to the varying diameters of the gas flow paths, the cross-sectional area of ​​the channels through which sound waves propagate within the exhaust noise reduction device undergoes abrupt changes, causing reflection and interference of the sound waves to achieve a noise reduction effect. The inner diameter of the tail hood 400 gradually decreases as it moves away from the housing 100, causing the tail hood 400 to protrude from the housing 100 and form a funnel-shaped airflow channel with the exhaust pipe 310. Airflow can flow along the inner wall of the funnel-shaped tail hood 400 toward the exhaust pipe 310, thereby preventing the formation of vortices within the tail hood 400 upon reflection of the airflow, which could cause high-frequency aerodynamic noise. This effectively reduces exhaust aerodynamic noise.

[0035] Specifically, if Figure 4 and Figure 5 The gas flow field distribution diagram is shown in FIG, and Figure 6 and Figure 7 As shown in the power distribution diagram of the present invention, the airflow is more evenly distributed after being guided in the tail hood compared to the traditional exhaust noise reduction device, effectively reducing the intensity and coverage of the vortex in the tail hood. The direction of the streamline represents the direction of movement of the air flow particles, and the density of the streamline represents the intensity of the gas. Figure 6 and Figure 7 As shown in the power distribution diagram comparison, the exhaust noise reduction device of this scheme can effectively reduce the power of exhaust sound compared with the traditional exhaust noise reduction device, where the darker the color, the smaller the sound power.

[0036] like Figure 2 As shown, in one embodiment, the tail cover 400 includes an inner bend 410 and an outer bend 420. One end of the inner bend 410 is connected to the barrel 200, and the other end of the inner bend 410 is connected to the exhaust pipe 310. One end of the outer bend 420 is connected to the housing 100, and the other end of the outer bend is connected to the exhaust pipe 310. A heat-insulating space is formed between the inner bend 410 and the outer bend 420. In this way, the tail cover 400 can fix the relative positions of the barrel 200 and the housing 100 through the inner bend 410 and the outer bend 420, respectively. Moreover, because the inner and outer bends 420 enclose the heat-insulating space, the heat of the engine exhaust gas can be stored in the heat-insulating space when the outdoor temperature is low, thereby preventing condensation inside the device and causing damage to the device. Specifically, the inner bending portion 410 and the outer bending portion 420 may be configured to be trumpet-shaped, and one end of the inner bending portion 410 is clamped to one end of the outer bending portion 420 .

[0037] like Figure 2As shown, in one embodiment, the exhaust noise reduction device includes a silencer pipe 500 disposed within the cylinder 200. This allows for the addition of a noise reduction structure within the device without changing the overall structure and appearance of the device, thereby improving the device's noise reduction effect. The number of silencer pipes 500 can be set to at least two, with all silencer pipes 500 distributed at intervals within the cylinder 200. While ensuring that the total cross-sectional area of ​​the pipe remains unchanged when sound passes through the silencer pipes 500, the provision of multiple silencer pipes 500 can reduce the diameter of a single silencer pipe 500, increasing the area ratio of a single silencer pipe 500 to the cross-sectional area of ​​the cylinder 200, thereby achieving a better noise reduction effect for the device. Preferably, the number of silencer pipes 500 can be set to four, in which case the silencer pipes 500 are evenly distributed within the cylinder 200 at 90 degrees, thereby achieving both the device's noise reduction effect and portability for assembly and disassembly, making it easy to use.

[0038] Further, if Figure 2 As shown, in one embodiment, the exhaust noise reduction device includes a first baffle 600 and a second baffle 610, the cylinder 200 is provided with an installation cavity, the first baffle 600 and the second baffle 610 are arranged at intervals in the installation cavity, the first baffle 600 and the second baffle 610 separate the installation cavity into a first expansion cavity 210, a second expansion cavity 230 and a blind cavity 220 located between the first expansion cavity 210 and the second expansion cavity 230, the silencer 500 is arranged in the blind cavity 220, one end of the silencer 500 passes through the first baffle 600 and extends to the first expansion cavity 210, and the other end of the silencer 500 passes through the second baffle 610 and extends to the second expansion cavity 230. In this way, after the gas enters the first expansion chamber 210 from the intake pipe 300, it passes through the silencer pipe 500 and directly crosses the blind chamber 220 to enter the second expansion chamber 230. Therefore, there is no gas flow in the blind chamber 220, and the device does not have the sound wave reflection or resonance silencing function. Since the blind chamber 220 occupies a certain length of the entire exhaust noise reduction device, a shorter silencer chamber can be designed to retain low-frequency sound when the overall size of the exhaust noise reduction device is long, thereby solving the problem of difficulty in maintaining exhaust quality when the overall size of the device is long. Furthermore, by adjusting the distribution position of the first baffle 600 and the second baffle 610, the length and length ratio of each chamber can be adjusted, so that each chamber is used to modulate sound of different frequency bands, thereby making the exhaust sound have linear sound pressure of each order, thereby enhancing the acceleration of the exhaust sound. Moreover, since the exhaust noise reduction device can retain low-frequency sound, the sound pressure of the low-frequency sound is maximized, thereby enhancing the sense of power of the exhaust sound.

[0039] In one embodiment, the length of the muffler tube 500 is set to an odd multiple of a quarter wavelength of the sound wave to be eliminated. Where m is the expansion ratio (the area ratio of the two cross sections before and after the sound wave transmission process), that is, k is the wave number, Where ω is the angular frequency of the sound wave, λ is the frequency of the sound wave, c is the speed of light; l is the tube length. According to the above formula, when the length of the silencer tube 500 is set to an odd multiple of a quarter wavelength of the sound wave, that is, When the value of the sound transmission loss TL is maximized only by the value of the expansion ratio m, the device has the best sound attenuation effect on the sound waves of the frequency corresponding to the wavelength. In other embodiments, the length of the silencer tube 500 can also be set to an even multiple of the wavelength of the sound wave to be retained. According to the formula, the length of the silencer tube 500 is set to an even multiple of one-quarter of the wavelength of the sound wave, that is, When the sound transmission loss TL reaches its minimum value, the device minimizes the sound attenuation effect on the frequency corresponding to the wavelength, allowing all sound waves of the corresponding frequency to pass through. Furthermore, according to the single-expansion tube sound transmission loss formula, adjusting the diameter of silencer tube 500 can change the expansion ratio between cylinder 200 and silencer tube 500, thereby adjusting the overall exhaust sound volume to meet legal industrial noise requirements.

[0040] like Figures 1 to 3 As shown, in one embodiment, the exhaust noise reduction device includes a protective cover 700. One end of the protective cover 700 is connected to the end of the housing 100 near the intake pipe 300, and the other end of the protective cover 700 is used to connect to the engine. The protective cover 700 is mounted on the intake pipe 300. In this way, the protective cover 700 protects the intake pipe 300 and prevents it from falling off due to collision. At the same time, sound waves passing through the intake pipe 300 are further reflected and interfered in the protective cover 700, thereby improving the noise reduction effect.

[0041] Furthermore, if Figures 1 to 3 As shown, the inner diameter of the protective cover 700 gradually decreases in the direction away from the cylinder 200. Since the diameter of the intake pipe 300 is smaller than that of the exhaust noise reduction device, and the intake pipe 300 is usually bent, setting the inner diameter of the protective cover 700 to gradually decrease axially at the end away from the cylinder 200 can make the protective cover 700 fit more tightly with the intake pipe 300 to prevent the protective cover 700 from falling off, and can also reduce the overall volume of the device.

[0042] Among them, Figure 3 As shown, the protective cover 700 may further be provided with a groove to indicate the installation angle of the protective cover 700, thereby facilitating the installation of the protective cover 700 and the air intake pipe 300. In other embodiments, the protective cover 700 may further be provided with a protrusion, an angle indicator or other structures to indicate the installation angle of the protective cover 700.

[0043] like Figure 2As shown, in one embodiment, the exhaust noise reduction device includes a third baffle 620. The exhaust pipe 310 is located at one end of the protective cover 700 near the cylinder 200 and is connected to the protective cover 700. The third baffle 620 is provided with a clearance hole for the intake pipe 300 to pass through. In this way, the third baffle 620 can fix the installation angle of the intake pipe 300, allowing the intake pipe 300 to stably deliver gas to the cylinder 200, and the structure is more stable.

[0044] The intake pipe 300 can be fixedly connected to the protective cover 700, thereby preventing the intake pipe 300 and protective cover 700 from separating during vehicle operation, thereby reducing the noise reduction effect of the exhaust noise reduction device. Furthermore, the fixed connection can include, but is not limited to, threaded connections, key connections, adhesive bonding, welding, and other connection methods, as long as the intake pipe 300 and protective cover 700 are relatively fixed.

[0045] In other embodiments, the distance between one end of the cylinder 200 and the first baffle 600, or the distance between the other end of the cylinder 200 and the second baffle 610, is set to an odd multiple of one-quarter wavelength of the sound wave to be eliminated. In this case, the sound transmission loss TL takes a maximum value based on the expansion ratio m, and the device has the best sound elimination effect on sound waves with frequencies corresponding to the wavelength.

[0046] In another aspect, a vehicle is provided. The vehicle includes an engine and an exhaust noise reduction device, wherein the engine is connected to the exhaust noise reduction device.

[0047] The vehicle is designed to reduce the noise generated by gas vibration during exhaust, as well as the reflection and interference of sound waves, thereby achieving a sound-absorbing effect. The vehicle's tail hood 400 protrudes from the vehicle's housing and forms a funnel-shaped airflow channel with the exhaust pipe 310. Airflow flows along the inner wall of the funnel-shaped tail hood 400 toward the exhaust pipe 310, thus preventing high-frequency aerodynamic noise caused by reflections within the tail hood 400 upon entering the vehicle. This effectively reduces exhaust aerodynamic noise.

[0048] It should be noted that the exhaust noise reduction device of the above embodiment can be used, but is not limited to, on vehicles. It can also be used in other mechanical equipment such as motor vehicles, construction machinery, industrial production line equipment, etc. where exhaust volume needs to be controlled, as well as other occasions that meet the use requirements.

[0049] It should be noted that "a certain body" or "a certain part" can be a part of the corresponding "component", that is, the "a certain body" or "a certain part" can be integrally formed with the "other parts of the component"; or it can be an independent component that is separable from the "other parts of the component", that is, the "a certain body" or "a certain part" can be manufactured independently and then combined with the "other parts of the component" into a whole. The expression of the above-mentioned "a certain body" or "a certain part" in this application is only one embodiment, for the convenience of reading, and not to limit the scope of protection of this application. As long as it contains the above-mentioned features and has the same function, it should be understood as an equivalent technical solution of this application.

[0050] It should be noted that the components included in the "units," "assemblies," "mechanisms," and "devices" of this application can also be flexibly combined, that is, modularized production can be carried out according to actual needs to facilitate modular assembly. The division of the above components in this application is only one embodiment, for the convenience of reading, and does not limit the scope of protection of this application. As long as the above components are included and have the same functions, it should be understood that they are equivalent technical solutions of this application.

[0051] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present invention. The term "and / or" used in the present invention includes any and all combinations of one or more of the relevant listed items.

[0052] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0053] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0054] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0055] It should be noted that when an element is referred to as being "fixed on", "set on", "fixed on" or "installed on" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there can be an intermediate element at the same time. Further, when an element is considered to be "fixed transmission connected" to another element, the two can be fixed in a detachable connection manner or in a non-detachable connection manner, as long as power transmission can be achieved, such as socketing, connection, integral molding fixation, welding, etc., which can be achieved in the prior art and will not be repeated here. When an element is perpendicular or approximately perpendicular to another element, it means that the ideal state of the two is vertical, but due to the influence of manufacturing and assembly, there may be a certain vertical error. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0056] It should also be understood that when explaining the connection relationship or positional relationship of elements, even if not explicitly described, the connection relationship and positional relationship should be interpreted as including a range of error, which should be within the acceptable deviation range of the specific value determined by those skilled in the art. For example, "approximately," "approximately," or "substantially" can mean within one or more standard deviations, which is not limited here.

[0057] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0058] The above embodiments merely illustrate several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. An exhaust noise reduction device, characterized in that: The exhaust noise reduction device comprises: case; a cylinder, the cylinder being disposed in the shell; a tail cover, one end of which is connected to one end of the housing, and an inner diameter of which gradually decreases in a direction away from the housing; and an air intake pipe and an exhaust pipe, wherein the air intake pipe extends to the other end of the housing, and the exhaust pipe is connected to the other end of the tail cover to form a funnel-shaped airflow channel; The exhaust noise reduction device includes a silencer pipe, which is arranged in the cylinder; The exhaust noise reduction device includes a first baffle and a second baffle, the cylinder is provided with an installation cavity, the first baffle and the second baffle are arranged at intervals in the installation cavity, the first baffle and the second baffle divide the installation cavity into a first expansion cavity, a second expansion cavity and a blind cavity located between the first expansion cavity and the second expansion cavity, the silencer is arranged in the blind cavity, one end of the silencer passes through the first baffle and extends to the first expansion cavity, and the other end of the silencer passes through the second baffle and extends to the second expansion cavity.

2. The exhaust noise reduction device according to claim 1, characterized in that: The tail cover includes an inner bending portion and an outer bending portion, one end of the inner bending portion is connected to the cylinder, and the other end of the inner bending portion is connected to the exhaust pipe, one end of the outer bending portion is connected to the shell, and the other end of the outer bending portion is connected to the exhaust pipe, and a heat insulating space is formed between the inner bending portion and the outer bending portion.

3. The exhaust noise reduction device according to claim 1, characterized in that: The number of the silencer pipes is at least two, and all the silencer pipes are distributed in the cylinder at intervals.

4. The exhaust noise reduction device according to claim 1, characterized in that: The length of the muffler tube is set to an odd multiple of a quarter wavelength of the sound wave to be eliminated.

5. The exhaust noise reduction device according to claim 1, characterized in that: The exhaust noise reduction device includes a protective cover, one end of which is connected to an end of the shell close to the intake pipe, and the other end of the protective cover is used to be connected to the engine, and the protective cover is sleeved on the intake pipe.

6. The exhaust noise reduction device according to claim 5, characterized in that: The inner diameter of the protective cover gradually decreases in a direction away from the cylinder.

7. The exhaust noise reduction device according to claim 5, characterized in that: The exhaust noise reduction device includes a third baffle, which is arranged at one end of the protective cover close to the cylinder and connected to the protective cover. The third baffle is provided with an avoidance hole for the intake pipe to pass through.

8. A vehicle, characterized in that: The invention comprises an engine and the exhaust noise reduction device according to any one of claims 1 to 7, wherein the engine is connected to the exhaust noise reduction device.

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