CN218760076U - Exhaust muffler and vehicle - Google Patents

Abstract

The utility model relates to an exhaust muffler and vehicle, exhaust muffler include casing, barrel, first baffle, second baffle, hush pipe, intake pipe and blast pipe. The exhaust silencer is used for modulating sound generated when gas vibrates during exhaust, and the cross section area of a channel through which sound waves pass when the sound waves are transmitted at each position inside the exhaust silencer is suddenly changed, so that reflection and interference of the sound waves are caused to achieve a silencing effect. The installation cavity of barrel is located to first baffle and second baffle and separates the installation cavity and form first inflation chamber, second inflation chamber and be located the blind chamber between first inflation chamber and the second inflation chamber, gaseous directly gets into the second inflation chamber through the hush pipe after getting into first inflation chamber from the intake pipe for can design shorter hush chamber in order to remain the low frequency sound under the longer condition of exhaust muffler overall dimension, thereby solved the problem that exhaust muffler overall dimension length is difficult to remain the low frequency sound for a long time.

Description

Exhaust muffler and vehicle

Technical Field

The utility model relates to a sound processing technology field especially relates to an exhaust muffler and vehicle.

Background

When an engine of mechanical equipment such as a motorcycle, an automobile and the like runs, waste gas generated after the engine burns flows out from an exhaust port of the engine, the waste gas drives air to vibrate when flowing in an exhaust pipe, and sound waves generated by the air vibration are processed by an exhaust silencer. In the traditional scheme, mechanical equipment of different discharge capacities usually disposes the exhaust muffler of corresponding size, and when mechanical equipment exhaust was more promptly, the whole size of exhaust muffler was also great, and when the whole size of exhaust muffler was longer, it remained low frequency sound's effect was relatively poor, was difficult to guarantee the exhaust sound quality under the prerequisite that satisfies the exhaust requirement.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is necessary to provide an exhaust muffler, which is directed to the problem that it is difficult to ensure the quality of exhaust gas when the conventional exhaust muffler is long in size.

The technical scheme is as follows:

the utility model provides an exhaust muffler, includes casing, barrel, first baffle, second baffle, hush pipe, intake pipe and blast pipe, the barrel is located in the casing, the barrel is equipped with the installation cavity, first baffle with the second baffle is located at interval the installation cavity, first baffle with the second baffle will the installation cavity is separated and is formed first expansion chamber, second expansion chamber and is located the blind cavity between first expansion chamber and the second expansion chamber, hush pipe is located in the blind cavity, hush pipe's one end is passed first baffle extends to first expansion chamber, hush pipe's the other end passes the second baffle extends to second expansion chamber is in order to avoid gaseous entering the blind cavity, the one end of intake pipe extends to first expansion chamber, the one end of blast pipe extends to second expansion chamber.

The technical solution is further explained below:

in one embodiment, the number of the silencing tubes is at least two, and all the silencing tubes are distributed in the blind cavity at intervals.

In one embodiment, the exhaust muffler comprises a tail cover, the tail cover is arranged at one end of the shell and connected with the shell, and the tail cover is provided with a first avoidance hole for the exhaust pipe to pass through.

In one embodiment, the tail cover is in a stepped shape, one end of the tail cover with the larger outer diameter is connected with the shell, and one end of the tail cover with the smaller outer diameter is connected with the barrel.

In one embodiment, the exhaust muffler comprises a protective cover, one end of the protective cover is connected with the shell, the other end of the protective cover is used for being connected with an engine, and the air inlet pipe is sleeved with the protective cover.

In one embodiment, the inner diameter of the boot tapers away from the barrel.

In one embodiment, the exhaust muffler comprises a third partition plate, the third partition plate is arranged at one end, close to the cylinder body, of the protection cover and connected with the protection cover, and the third partition plate is provided with a second avoidance hole for the air inlet pipe to pass through.

In one embodiment, the length of the sound-deadening tube is set to an odd multiple of a quarter wavelength of the sound wave to be cancelled.

In one embodiment, the distance between one end of the cylinder and the first partition plate is set to be an odd multiple of a quarter wavelength of the sound wave to be eliminated.

In one embodiment, the distance between the other end of the cylinder and the second partition plate is set to be an odd multiple of a quarter wavelength of the sound wave to be eliminated.

In another aspect, a vehicle is provided that includes an engine coupled to the exhaust muffler and the exhaust muffler.

The exhaust silencer and the vehicle are used for modulating sound generated when gas vibrates during exhaust, the gas is exhausted from the exhaust pipe after passing through the structures such as the air inlet pipe, the cylinder body and the silencing pipe, and due to different diameters of the gas circulation positions, the cross section area of a channel through which sound waves pass when the sound waves are transmitted in each position inside the exhaust silencer is suddenly changed, so that the reflection and interference of the sound waves are caused to realize the silencing effect. The installation cavity of barrel is located to first baffle and second baffle and separates the formation first expansion chamber with the installation cavity, second expansion chamber and be located the blind chamber between first expansion chamber and the second expansion chamber, gaseous stride across blind chamber through the hush pipe and directly get into second expansion chamber after getting into first expansion chamber from the intake pipe, consequently there is not gaseous flow in the blind chamber and do not have sound wave reflection or resonance noise elimination function, because the blind chamber has occupied the space of whole exhaust muffler certain length, make can design shorter hush chamber in order to remain the low frequency sound under the longer condition of exhaust muffler overall dimension, thereby solved the problem that exhaust muffler overall dimension length is difficult to remain the low frequency sound for a long time.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic view of an overall structure of an exhaust muffler according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view of the exhaust muffler of FIG. 1;

FIG. 3 is another angular overall view of the exhaust muffler of FIG. 1;

FIG. 4 is a graph of the spectral characteristics of the exhaust gas resulting from testing of the exhaust silencer of FIG. 1.

100. A housing; 200. a cylinder body; 210. a first expansion chamber; 220. a blind cavity; 230. a second expansion chamber; 300. an air inlet pipe; 310. an exhaust pipe; 400. a sound-deadening tube; 500. a first separator; 510. a second separator; 520. a third separator; 600. a tail cover; 700. a protective cover.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

As described in the background art, when an engine of a mechanical device such as a vehicle or an automobile is operated, exhaust gas generated by combustion of the engine flows out from an exhaust port of the engine, and the exhaust gas flows through an exhaust pipe and flows to an exhaust muffler. The conventional exhaust silencer needs to satisfy power requirements such as reduction of exhaust back pressure and smooth gas circulation, and also needs to satisfy the noise requirements specified by the national standards and the requirements of users on the exhaust tone quality and the listening feeling, such as the exhaust tone quality and the acceleration. According to the propagation principle of sound waves, in order to obtain a deep and muffled exhaust sound, low-frequency sound needs to be reserved and high-frequency sound needs to be eliminated, so that the exhaust muffler needs to weaken the muffling function of the low-frequency sound and strengthen the muffling function of the high-frequency sound, and a short exhaust muffler cylinder needs to be designed. However, when the exhaust volume of the vehicle is large, a long barrel is usually required to be mounted to match the vehicle, which makes it difficult to achieve the sound processing requirement of retaining low-frequency sound and eliminating high-frequency sound. Further, when the size of the exhaust muffler cylinder is short, in order to avoid aerodynamic noise caused by impact of the airflow of the long muffling pipe on the wall surface of the short chamber, the muffling pipe needs to be a short pipe, and at this time, since the length of the short muffling pipe is far lower than the acoustic wave wavelength of low frequency, and the short pipe and the short cylinder form a resonance cavity structure, the exhaust muffler can only retain high frequency sound and eliminate low frequency sound, and therefore, the sound processing requirements of retaining low frequency sound and eliminating high frequency sound can not be met by shortening the size of the muffling pipe inside the exhaust muffler.

In order to solve the above problem, as shown in fig. 1 to 2, in one embodiment, there is provided an exhaust muffler, which includes a casing 100, a cylinder 200, a first partition plate 500, a second partition plate 510, a silencer duct 400, an intake duct 300, and an exhaust duct 310, the cylinder 200 is disposed in the casing 100, the cylinder 200 is provided with a mounting cavity, the first partition plate 500 and the second partition plate 510 are disposed in the mounting cavity at intervals, the first partition plate 500 and the second partition plate 510 partition the mounting cavity to form a first expansion cavity 210, a second expansion cavity 230, and a blind cavity 220 between the first expansion cavity 210 and the second expansion cavity 230, the silencer duct 400 is disposed in the blind cavity 220, one end of the silencer duct 400 passes through the first partition plate 500 and extends to the first expansion cavity 210, the other end of the silencer duct 400 passes through the second partition plate 510 and extends to the second expansion cavity 230 to prevent gas from entering the blind cavity 220, one end of the intake duct 300 extends to the first expansion cavity 210, and one end of the exhaust duct 310 extends to the second expansion cavity 230.

Wherein the first and second baffles 500, 510 may be in sealing engagement with the silencer duct 400 or the housing 100 to further prevent gas from entering the blind cavity 220. The form of the sealing fit may be, but is not limited to, a rubber seal, an interference seal, etc., and only needs to enable the first partition plate 500 and the second partition plate 510 to separate the installation cavity to form a closed cavity.

Wherein, the number of the silencing tubes 400 can be set to be at least two, and all the silencing tubes 400 are distributed in the cylinder 200 at intervals. Under the condition that the total section area of the pipeline is not changed when the sound passes through the silencing tubes 400, the diameter of a single silencing tube 400 can be reduced by arranging the silencing tubes 400, the area ratio of the section of the single silencing tube 400 to the section of the cylinder body 200 is enlarged, and therefore a better silencing effect is achieved. Preferably, the number of the silencer pipes 400 can be four, and at this time, the silencer pipes 400 are uniformly distributed in the cylinder 200 at 90 degrees, so that the silencing effect of the silencer pipes 400 and the portability of assembly and disassembly can be both considered, and the use is convenient.

Wherein, the intake pipe 300 and the exhaust pipe 310 may be detachably connected with the housing 100. Thus, by adjusting the installation positions of the first partition plate 500 and the second partition plate 510, the length and length proportion of each chamber through which sound passes can be adjusted, so that the exhaust muffler can process and output sound of different frequency bands, and further the exhaust sound has acceleration. Further, a portion of the inlet pipe 300 extending into the first expansion chamber 210, the cylinder body 200, the outlet pipe 310, the muffler pipe 400, and a portion of the outlet pipe 310 extending into the second expansion chamber 230 may be coaxially disposed, thereby facilitating the disassembly and assembly of the exhaust muffler.

Wherein, a plurality of water leakage holes may be provided on the case 100. Thus, the water leakage hole can discharge the water vapor permeated from the exhaust pipe 310, thereby preventing the device from being rusted due to the condensation of the water vapor inside the housing 100.

The exhaust muffler is used for modulating sound generated when gas vibrates during exhaust, the gas is exhausted from the exhaust pipe 310 after passing through the structures such as the gas inlet pipe 300, the cylinder 200, the silencing pipe 400 and the like, and due to different diameters of various parts of gas circulation, the cross-sectional area of a channel through which sound waves pass when being transmitted at various parts in the muffler is suddenly changed, so that the reflection and interference of the sound waves are caused to realize the silencing effect. First baffle 500 and second baffle 510 locate the installation cavity of barrel 200 and separate the installation cavity in proper order and form first expansion chamber 210, blind cavity 220 and second expansion chamber 230, gaseous directly stridees across blind cavity 220 through hush pipe 400 and gets into second expansion chamber 230 after getting into first expansion chamber 210 from intake pipe 300, consequently there is not gaseous flow in blind cavity 220 and does not possess and do not have sound wave reflection or resonance noise elimination function, because blind cavity 220 has occupied the space of whole exhaust muffler certain length, make can design shorter hush cavity in order to keep low frequency sound under the longer condition of exhaust muffler overall dimension, thereby solved the problem that exhaust muffler overall dimension length is longer to be difficult to keep low frequency sound.

Further, the length and the length ratio of each chamber can be adjusted by adjusting the distribution positions of the first partition board 500 and the second partition board 510, so that each chamber is used for modulating sounds of different frequency bands. Specifically, fig. 4 is a graph of the spectral characteristics of the exhaust sound of the exhaust muffler of an embodiment, in which the vertical axis represents the number of revolutions per minute (rpm) of the engine, the horizontal axis represents the frequency of the exhaust sound, and the color of the region corresponds to the decibel value (unit: dB) of the exhaust sound on the right side. As shown in fig. 4, the exhaust gas modulated by the exhaust muffler of the embodiment has linear sound pressures of various orders, so that the exhaust sound can have acceleration feeling, and the exhaust muffler has a good effect of retaining low-frequency sound, so that the sound pressure of low-frequency sound is maximized, and the strength of the exhaust sound is enhanced.

Further, as shown in fig. 2, in one embodiment, the first and second partition plates 500 and 510 have a stepped shape, the end of the first partition plate 500 having a larger outer diameter is connected to the case 100, and the end of the first partition plate 500 having a smaller outer diameter is connected to the silencer duct 400. Thus, the first partition plate 500 has a larger contact area with the first cylinder 200 and the silencer duct 400, so that the first partition plate 500 and the silencer duct 400 and the first partition plate 500 and the silencer duct 400 are stably connected. In other embodiments, the second partition plate 510 has a step shape, the end with the larger outer diameter of the second partition plate 510 is connected to the casing 100, and the end with the smaller outer diameter of the second partition plate 510 is connected to the silencer duct 400, so as to ensure that the second partition plate 510 and the silencer duct 400 and the first partition plate 500 and the silencer duct 400 are stably connected.

As shown in fig. 1 and 2, in one embodiment, the exhaust silencer includes a tail cover 600, the tail cover 600 is disposed at one end of the casing 100 and connected to the casing 100, and the tail cover 600 is provided with a first avoiding hole for the exhaust pipe 310 to pass through. So, tail cover 600 can block the dust for barrel 200, and the dust gets into barrel 200 and leads to exhaust muffler noise cancelling effect not good when preventing to exhaust, and tail cover 600 can provide the support for barrel 200 simultaneously, has avoided barrel 200 and casing 100 direct contact to cause wearing and tearing.

As shown in FIG. 2, in one embodiment, the tail cap 600 is stepped, the end of the tail cap 600 with the larger outer diameter is connected to the housing 100, and the end of the tail cap 600 with the smaller outer diameter is connected to the barrel 200. Thus, the tail cover 600 has a larger contact area with the first cylinder 200 and the housing 100, thereby ensuring that the tail cover 600 can be firmly mounted on the housing 100.

As shown in fig. 1 to 3, in one embodiment, the exhaust muffler includes a protective cover 700, one end of the protective cover 700 is connected to the casing 100, the other end of the protective cover 700 is used for connecting to an engine, and the protective cover 700 is sleeved on the intake pipe 300. So, the safety cover 700 can protect the intake pipe 300, avoids the intake pipe 300 to drop because of the collision, and simultaneously, the sound wave that sees through the intake pipe 300 further takes place to reflect and interfere in the safety cover 700 to the noise elimination effect has been improved.

Further, as shown in fig. 1 to 3, the inner diameter of the protective cap 700 is gradually reduced in a direction away from the cylinder 200. Since the diameter of the intake pipe 300 is smaller than that of the exhaust muffler and the intake pipe 300 is generally bent, setting the inner diameter of the protective cover 700 to be gradually reduced in the axial direction at the end away from the cylinder 200 enables the protective cover 700 to be more closely fitted with the intake pipe 300 to prevent the protective cover 700 from falling off, and can reduce the overall volume of the exhaust muffler.

As shown in fig. 3, a groove may be further provided on the protective cover 700 to indicate a mounting angle of the protective cover 700, so as to facilitate mounting of the protective cover 700 with the air inlet duct 300. In other embodiments, a protrusion, an angle indicator, etc. may be provided on the protection cover 700 to indicate the installation angle of the protection cover 700.

As shown in fig. 2, in one embodiment, the exhaust muffler includes a third partition 520, the exhaust pipe 310 is disposed at one end of the protective cover 700 close to the cylinder 200 and connected to the protective cover 700, and the third partition 520 has a second avoiding hole for the intake pipe 300 to pass through. Thus, the third partition plate 520 can fix the installation angle of the air inlet pipe 300, so that the air inlet pipe 300 can stably convey air to the cylinder 200, and the structure is more stable.

In one embodiment, the length of the silencer duct 400 is set to an odd multiple of a quarter wavelength of the sound waves to be eliminated. According to the principle of sound transmission, the single expansion pipe transmits sound loss

Wherein m is the expansion ratio (the area ratio of the two sections before and after the transmission process of the sound wave), i.e. </or>

k is the number of waves,

wherein, omega is the angular frequency of the sound wave, lambda is the frequency of the sound wave, and c is the speed of light; l is the length of the pipe, and when the length of the silencer duct 400 is set to be a quarter wavelength of the sound wave according to the above formulaAt odd multiples, i.e.

In the case of sin (kl) = ± 1, the value of the sound transmission loss TL is maximized only by the value of the expansion ratio m, and the exhaust muffler has the best sound wave silencing effect for the frequency corresponding to the wavelength. In other embodiments, the length of the sound-deadening tube 400 can also be set to an even multiple of the wavelength of the sound waves to be retained, the length of the sound-deadening tube 400 being set to an even multiple of a quarter of the wavelength of the sound waves, i.e. < £ er>

In the case of sin (kl) =0, the value of the sound transmission loss TL is the minimum value, and when the sound wave silencing effect of the exhaust muffler on the frequency corresponding to the wavelength is the minimum, all the sound waves of the frequency corresponding to the wavelength pass through. Further, according to the sound transmission loss formula of the single expansion pipe, the expansion ratio between the cylinder 200 and the muffler pipe 400 can be changed by adjusting the pipe diameter of the muffler pipe 400, so that the overall volume of the exhaust sound can be adjusted to meet the industrial noise requirement stipulated by law.

In other embodiments, the distance between one end of the cylinder 200 and the first septum 500 or the distance between the other end of the cylinder 200 and the second septum 510 is set to an odd multiple of a quarter wavelength of the sound wave to be cancelled. At this time, the sound transmission loss TL takes a maximum value according to the value of the expansion ratio m, and the exhaust muffler has the best sound wave muffling effect for the frequency corresponding to the wavelength.

In another aspect, a vehicle is provided that includes an engine and an exhaust muffler, the engine coupled to the exhaust muffler.

The vehicle can cause the reflection and interference of sound waves to achieve the silencing effect, the cavity between the first partition plate 500 and the second partition plate 510 does not have the functions of reflection silencing or resonance silencing because no gas flows, and the cavity occupies the space with a certain length of the whole exhaust silencer, so that the exhaust silencer can design a shorter silencing cavity to keep low-frequency sound under the condition of longer overall size, and the problem that the low-frequency sound is difficult to keep when the overall size and the length of the exhaust silencer are longer is solved.

It should be noted that the exhaust silencer of the above embodiment can be used in vehicles, but not limited to vehicles, and can also be used in other mechanical equipment, such as automobiles, engineering machinery, industrial production line equipment, etc., where exhaust sound volume needs to be controlled, and other occasions where the use requirements are met.

The "certain body" and the "certain portion" may be a part corresponding to the "member", that is, the "certain body" and the "certain portion" may be integrally formed with the other part of the "member"; the "part" can be made separately from the "other part" and then combined with the "other part" into a whole. The expressions "a certain body" and "a certain part" in the present application are only one example, and are not intended to limit the scope of the present application for reading convenience, and the technical solutions equivalent to the present application should be understood as being included in the above features and having the same functions.

It should be noted that, the components included in the "unit", "assembly", "mechanism" and "apparatus" of the present application can also be flexibly combined, i.e. can be produced in a modularized manner according to actual needs, so as to facilitate the modularized assembly. The division of the above components in the present application is only one of the embodiments, which is convenient for reading and does not limit the scope of protection of the present application, and as long as the above components are included and the functions are the same, it should be understood that the present application is an equivalent technical solution.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. 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, "a plurality" means at least two, e.g., two, three, etc., unless explicitly defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

In the present application, unless expressly stated or limited otherwise, a first feature "on" or "under" a second feature may be directly contacting the second feature or the first and second features may be indirectly contacting the second feature through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to," "disposed on," "secured to," or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. Further, when an element is regarded as "fixed transmission connection" another element, the two elements may be fixed in a detachable connection manner or in an undetachable connection manner, and power transmission can be achieved, such as socket joint, connection, integrally-formed fixation, welding and the like, which can be achieved in the prior art and are not described herein again. When an element is perpendicular or nearly perpendicular to another element, it is desirable that the two elements are perpendicular, but some vertical error may exist due to manufacturing and assembly effects. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

It should also be understood that in explaining the connection relationship or the positional relationship of the elements, although not explicitly described, the connection relationship and the positional relationship are interpreted to include an error range which should be within an acceptable deviation range of a specific value determined by those skilled in the art. For example, "about", "approximately" or "substantially" may mean within one or more standard deviations, and is not limited thereto.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above embodiments only represent several embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (10)

1. An exhaust muffler, comprising:

a housing;

the cylinder body is arranged in the shell and provided with an installation cavity;

the first partition plate and the second partition plate are arranged in the installation cavity at intervals, and divide the installation cavity into a first expansion cavity, a second expansion cavity and a blind cavity between the first expansion cavity and the second expansion cavity;

the silencing pipe is arranged in the blind cavity, one end of the silencing pipe penetrates through the first partition plate and extends to the first expansion cavity, and the other end of the silencing pipe penetrates through the second partition plate and extends to the second expansion cavity to prevent gas from entering the blind cavity;

the air inlet pipe is connected with the first expansion cavity in a sleeved mode, one end of the air inlet pipe extends to the first expansion cavity, and one end of the exhaust pipe extends to the second expansion cavity.

2. The exhaust muffler according to claim 1, wherein the number of the muffler pipes is at least two, and all the muffler pipes are distributed in the blind cavity at intervals.

3. The exhaust muffler according to claim 2, comprising a tail cover, the tail cover being disposed at one end of the housing and connected to the housing, the tail cover being provided with a first avoidance hole for the exhaust pipe to pass through.

4. The exhaust muffler according to claim 3, wherein the tail cover has a stepped structure, the end of the tail cover having a larger outer diameter is connected to the housing, and the end of the tail cover having a smaller outer diameter is connected to the cylinder.

5. The exhaust muffler of claim 1, comprising a protective cover, one end of the protective cover being connected to the housing and the other end of the protective cover being adapted to be connected to an engine, the protective cover being fitted over the intake pipe.

6. The exhaust muffler according to claim 5, wherein an inner diameter of the protection cover is gradually reduced in a direction away from the cylinder.

7. The exhaust silencer of claim 5, comprising a third partition plate, wherein the third partition plate is arranged at one end of the protective cover close to the cylinder and connected with the protective cover, and the third partition plate is provided with a second avoidance hole for the air inlet pipe to pass through.

8. The exhaust muffler according to claim 1, wherein the length of the muffler pipe is set to an odd number multiple of a quarter wavelength of the sound wave to be cancelled.

9. The exhaust muffler according to claim 1, wherein a distance between one end of the cylinder and the first partition plate is set to an odd multiple of a quarter wavelength of the sound wave to be cancelled; and/or the distance between the other end of the cylinder and the second partition plate is set to be an odd multiple of a quarter wavelength of the sound waves to be eliminated.

10. A vehicle characterized by comprising an engine and the exhaust muffler as recited in any one of claims 1 to 9, the engine being connected to the exhaust muffler.

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