A silencer

Abstract

A silencer comprises: a shell, a front cover is installed at one end of the shell, and a rear cover is installed at the other end of the shell, and is characterized in that: a partition assembly for silencer is installed between the front cover and the rear cover, and the partition assembly is located in the shell; an annular hollow compression release silencer channel is arranged in the partition assembly, a second silencer chamber is arranged at one end of the compression release silencer channel, and a third silencer chamber is arranged at the other end of the compression release silencer channel; this solution solves the problem that the partition of the existing silencer itself cannot play a role in noise reduction, and solves the problem that the existing silencer has a poor noise reduction effect, and solves the problems of large welding amount, complex process and high cost of the existing silencer.

Description

Technical Field

[0001] The invention relates to the technical field of internal combustion engine mufflers, and in particular to a muffler. Background Art

[0002] An internal combustion engine generates exhaust gas during operation. If the exhaust gas is discharged directly, a lot of noise will be generated. Therefore, a muffler is usually required to be installed, otherwise it will cause serious noise pollution. The existing muffler mainly sets a muffler pipe to achieve the effect of silencing and noise reduction. The noise reduction effect is achieved by setting multiple sections of the muffler pipe and increasing the length of the muffler pipe, and a partition is set to form a chamber to achieve the effect of noise reduction. A porous sound-absorbing material is set to reduce noise, and the sound-absorbing material is fixed on the inner wall of the air flow channel or arranged in a certain way. When the sound wave enters the muffler, part of the noise can be converted into heat energy by friction in the pores of the porous material and dissipated, so that the noise passing through the muffler is weakened, thereby achieving noise reduction and silencing. However, the existing muffler has the problems of poor noise reduction and silencing effect, complex manufacturing process and high cost. Summary of the invention

[0003] The invention aims to solve one of the technical problems in the above-mentioned related technologies at least to some extent.

[0004] To this end, the purpose of the present invention is to provide a silencer, which mainly solves the problem that the partition of the existing silencer itself cannot reduce noise, and solves the problem that the existing silencer has poor noise reduction effect, and solves the problem that the existing silencer has large welding volume, complex process and high cost.

[0005] An embodiment of the present invention provides a muffler, comprising: a shell, a front cover is installed at one end of the shell, and a rear cover is installed at the other end of the shell, characterized in that: a baffle assembly for muffler is installed between the front cover and the rear cover, and the baffle assembly is located in the shell; an annular hollow compression-release muffler channel is arranged in the baffle assembly, a second muffler chamber is arranged at one end of the compression-release muffler channel, and a third muffler chamber is arranged at the other end of the compression-release muffler channel

[0006] In the aforementioned silencer, the inner hollow cross-sections of the second silencer chamber and the third silencer chamber are larger than the inner hollow cross-section of the middle portion of the compression-release silencer channel.

[0007] In the aforementioned muffler, a first muffler chamber is arranged between the front cover and the partition assembly, and a first muffler pipe is installed on the front cover and is located in the first muffler chamber.

[0008] In the aforementioned muffler, a fourth muffler chamber is provided between the rear cover and the partition assembly, and the second muffler pipe is located in the fourth muffler chamber.

[0009] In the aforementioned silencer, one end of the second silencer pipe is mounted on the baffle assembly, and the other end is mounted on the rear cover.

[0010] In the aforementioned silencer, a raised arc surface is provided at the position where the partition assembly is connected to the second silencer pipe, and a plurality of first through holes for silencer are provided on the arc surface.

[0011] In the aforementioned muffler, a plurality of evenly distributed second through holes are arranged on the side end surface of the partition assembly close to the front cover, and the noise airflow in the first muffler chamber can enter the second muffler chamber through the second through holes.

[0012] In the aforementioned silencer, a plurality of evenly distributed third through holes are arranged on the side end surface of the partition assembly close to the rear cover, and the noise airflow in the third silencer chamber can enter the fourth silencer chamber through the third through holes.

[0013] In the aforementioned muffler, the front cover and the rear cover are connected to the outer shell by crimping and buckling.

[0014] In the aforementioned silencer, the first silencer pipe and the second silencer pipe are configured as tubular structures, and a plurality of silencer holes are provided on the side surfaces.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] This solution achieves a compression and release effect on the noise airflow by setting a compression and release silencer channel inside the baffle assembly for compressing and releasing the noise airflow. The noise airflow is compressed and released step by step in the compression and release silencer channel, so that the noise airflow is gradually consumed and weakened, thereby achieving a noise reduction effect. The annular hollow design of the compression and release silencer channel also requires the noise airflow to move a longer distance in the compression and release silencer channel, and the direction of the noise airflow is changed while moving, which is beneficial to reducing and weakening the noise airflow, so that the noise of the silencer using this solution is lower.

[0017] The silencer of the present invention is provided with a plurality of silencer chambers, including a first silencer chamber, a second silencer chamber, a third silencer chamber, and a fourth silencer chamber to reduce the noise of the noise airflow by multi-stage compression and release, and is combined with a first silencer pipe and a second silencer pipe to disperse and reduce the noise of the noise airflow, thereby reducing the noise of the silencer.

[0018] This scheme arranges the internal hollow cross-sections of the second silencer chamber and the third silencer chamber to be larger than the internal hollow cross-section of the middle part of the compression release silencer channel, so that a compression release effect is formed between the two ends of the compression release silencer channel and the middle part of the compression release silencer channel, thereby realizing step-by-step compression and release of the noisy airflow, which is beneficial to reducing and weakening the noisy airflow.

[0019] This scheme realizes that the partition assembly has multiple silencer chambers to compress and release the noise airflow by setting the second silencer chamber and the third silencer chamber in the partition assembly, and realizes step-by-step compression from the second silencer chamber to the compression-release silencer channel, and then realizes step-by-step release from the compression-release silencer channel to the third silencer chamber, thereby reducing and weakening the noise airflow, making the noise airflow coming out of the third silencer chamber very weak, and after the dispersed noise reduction of the fourth silencer chamber and the second silencer tube, the noise of the noise airflow is very low, thereby realizing the noise reduction effect of the partition assembly and the silencer.

[0020] The structure on the partition assembly of the present invention is stamped and formed as one piece, and the second silencer chamber, the third silencer chamber, the compression release silencer channel and other structures on the partition assembly are integrated together by stamping and forming. A mold can be used for stamping and forming to maintain the stability and consistency of the partition assembly, and standardized production of the partition assembly can be achieved. The partition assembly of this scheme can reduce the amount of welding compared to the partition of the existing silencer device. The partition assembly is connected to the front cover and the rear cover by crimping and buckling, which is simple to install and reduces the process flow, thereby reducing the cost of the partition assembly and the silencer. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is the explosion diagram of this scheme;

[0022] Figure 2 This is a three-dimensional explosion diagram of this scheme;

[0023] Figure 3 This is a schematic diagram of the main cross-section structure of this scheme;

[0024] Figure 4 A three-dimensional diagram of the partition assembly of this scheme;

[0025] Figure 5 Schematic diagram of the noise airflow movement of this scheme

[0026] Figure 6 It is a three-dimensional cross-sectional schematic diagram of this scheme;

[0027] Figure 7 This is a three-dimensional cross-section diagram of the scheme showing the structural intent;

[0028] Figure 8 This is an exploded schematic diagram of the overall structure of this scheme.

[0029] Figure markings: 1-housing, 2-front cover, 3-rear cover, 4-partition assembly, 401-compression release silencer channel, 4011-second silencer chamber, 4012-third silencer chamber, 402-arc surface, 4021-first through hole, 403-second through hole, 404-third through hole, 5-first silencer chamber, 6-first silencer pipe, 7-fourth silencer chamber, 8-second silencer pipe, 9-first partition, 10-second partition. DETAILED DESCRIPTION

[0030] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific embodiments.

[0031] Embodiment: A muffler of the present invention, such as Figures 1 to 8 As shown in the structure, it includes: a shell 1, a front cover 2 is installed at one end of the shell 1, and a rear cover 3 is installed at the other end of the shell 1, forming the overall structure of the silencer; a partition assembly for silencing is installed between the front cover 2 and the rear cover 3, and the partition assembly is located in the shell 1 to form the internal silencer structure of the silencer; an annular hollow compression-release silencer channel 401 is mainly arranged in the partition assembly, and the compression-release silencer channel 401 is used to achieve the compression and release effect of the noise airflow, and the noise airflow is compressed and released step by step in the compression-release silencer channel 401, so that the noise airflow is gradually consumed and weakened, thereby achieving the effect of noise reduction; wherein the compression-release silencer channel A second silencer chamber 4011 is provided at one end of 401, and a third silencer chamber 4012 is provided at the other end of the compression-release silencer channel 401. By providing the second silencer chamber 4011 and the third silencer chamber 4012, it is achieved that the partition assembly has multiple silencer chambers to compress and release the noise airflow, and step-by-step compression is achieved from the second silencer chamber 4011 to the compression-release silencer channel 401, and then step-by-step release is achieved from the compression-release silencer channel 401 to the third silencer chamber 4012, thereby reducing and weakening the noise airflow, making the noise airflow coming out of the third silencer chamber 4012 very weak, thereby achieving the effect of noise reduction.

[0032] The main noise reduction structure of this scheme is that the internal hollow cross-section of the second silencer chamber 4011 and the third silencer chamber 4012 is larger than the internal hollow cross-section of the middle part of the compression release silencer channel 401, that is, the cross-sectional area of ​​the internal hollow cross-section of the second silencer chamber 4011 is larger than the cross-sectional area of ​​the internal hollow cross-section of the middle part of the compression release silencer channel 401, and the cross-sectional area of ​​the internal hollow cross-section of the third silencer chamber 4012 is also larger than the cross-sectional area of ​​the internal hollow cross-section of the middle part of the compression release silencer channel 401, so that the effect of compressing noise airflow is formed between the second silencer chamber 4011 and the middle part of the compression release silencer channel 401, and the effect of releasing noise airflow is formed between the middle part of the compression release silencer channel 401 and the third silencer chamber 4012; the internal hollow cross-sections at both ends of the compression release silencer channel 401 are larger than the internal hollow cross-section of the middle part of the compression release silencer channel 401, so as to achieve better noise reduction effect.

[0033] The first silencer chamber 5 of the present scheme is mainly a first silencer chamber 5 set between the front cover 2 and the partition assembly. The first silencer pipe 6 is installed on the front cover 2 and is located in the first silencer chamber 5. The partition assembly, the outer shell 1, and the front cover 2 surround an independent chamber to form the first silencer chamber 5. One end of the first silencer pipe 6 of the front cover 2 is fixed on the front cover 2 and serves as the inlet of the silencer. The noise airflow enters the silencer from this position. After entering the first silencer pipe 6, the noise airflow is dispersed and noise-reduced by the first silencer pipe 6 and then dispersed from the side of the first silencer pipe 6 into the first silencer chamber 5.

[0034] The fourth silencer chamber 7 of the present scheme is mainly a fourth silencer chamber 7 set between the back cover 3 and the partition assembly. The partition assembly, the outer shell 1, and the back cover 3 surround an independent chamber forming the fourth silencer chamber 7, and the second silencer pipe 8 is located in the fourth silencer chamber 7 to disperse and reduce the noise airflow, wherein one end of the second silencer pipe 8 is installed on the partition assembly, and the other end is installed on the back cover 3, so that a part of the airflow after the dispersion and noise reduction by the first silencer chamber 5 directly enters the second silencer pipe 8, preventing the noise airflow in the partition assembly from being excessively concentrated to generate additional noise, which is conducive to the multi-directional dispersion movement of the noise airflow and the better noise reduction effect.

[0035] In this solution, a plurality of evenly distributed second through holes 403 are arranged on the side end surface of the partition assembly close to the front cover 2, so that the noise airflow in the first silencer chamber 5 can enter the second silencer chamber 4011 through the second through holes 403. The partition assembly is sealed with the first silencer chamber 5, and most of the noise airflow in the first silencer chamber 5 enters the second silencer chamber 4011 through the second through holes 403. The second silencer chamber 4011 has a certain dispersion and noise reduction effect on the incoming noise airflow.

[0036] In this solution, a plurality of evenly distributed third through holes 404 are arranged on the side end surface of the partition assembly close to the rear cover 3, and the noise airflow in the third silencer chamber 4012 can enter into the fourth silencer chamber 7 through the third through holes 404, that is, the noise airflow in the compression and release silencer channel 401 is in a moving state and moves toward the third silencer chamber 4012, and the third silencer chamber 4012 has a certain dispersion and noise reduction effect on the incoming noise airflow, and then the noise airflow enters into the fourth silencer chamber 7 through the third through holes 404 for further dispersion and noise reduction.

[0037] In order to form a DC silencer structure of the partition assembly, the DC silencer structure is mainly formed after the partition assembly is installed in the silencer. A raised arc surface 402 is mainly provided in the middle of the partition assembly, that is, a raised arc surface 402 is provided at the position where the partition assembly is connected to the second silencer pipe 8, and a plurality of first through holes 4021 for silencer are provided on the arc surface 402. The raised arc surface 402 and the second silencer pipe 8 are connected to each other in a coordinated manner, and a plurality of first through holes 4021 are provided on the arc surface 402. The arc surface 402 structure is not only conducive to increasing the passing area of ​​the noise airflow, but also conducive to setting more first through holes 4021. 21, and plays the role of limiting installation between the silencer pipe, the first through hole 4021 is used for the passage of noise airflow, so that the noise airflow can enter the second silencer pipe 8 through the partition assembly, and a plurality of silencer holes are arranged on the side of the second silencer pipe 8, so that the noise airflow is dispersed to the plurality of silencer holes on the side and then diffuses in different directions, which can play the role of reducing noise, so that the noise airflow is reduced and weakened in the second silencer pipe 8, and at the same time, the noise airflow enters the fourth silencer chamber 7 through the second silencer pipe 8 and gradually disperses and weakens, and finally the noise airflow is discharged to the outside of the silencer through the second silencer pipe 8, thereby reducing the noise.

[0038] In this solution, the compression release silencer channel 401 is set as a hollow annular U-shaped structure and is distributed on both side end surfaces of the partition assembly. The middle position of the compression release silencer channel 401 and the second silencer chamber 4011 and the third silencer chamber 4012 at both ends of the compression release silencer channel 401 together constitute a hollow annular U-shaped structure, forming an overall channel structure of the compression release noise airflow, and are distributed on both side end surfaces of the partition assembly to jointly constitute a hollow annular U-shaped structure in the middle of the partition assembly, which has a compact structure and good noise reduction effect.

[0039] Optionally, in order to achieve the compression and release effect on the noise airflow, and to achieve the effect of guiding the movement of the noise airflow, the present scheme sets the second silencer chamber 4011 and the third silencer chamber 4012 to be hollow raised square structures. The square structure of the chamber makes the cross-sectional area of ​​the hollow section inside the second silencer chamber 4011 and the third silencer chamber 4012 large, which can accommodate more noise airflow and have a certain compression effect on the noise airflow; and sets the middle part of the compression and release silencer channel 401 to be a raised arc structure to form an arc-shaped regional channel, so that the noise airflow can be reduced and weakened in the compression and release silencer channel 401 while being able to maximize The arc-shaped area channel guides the noise airflow within a range, and no additional noise is generated in the process of guiding the noise airflow, which reduces the resistance of the noise airflow moving in the compression-release silencer channel 401, and is beneficial to the attenuation of the noise airflow. The square structure design of the second silencer chamber 4011 and the third silencer chamber 4012 and the arc-shaped structure design in the middle of the compression-release silencer channel 401 enable the second chamber to form a compressed noise airflow effect to the compression-release silencer channel 401, and the compression-release silencer channel 401 to the third silencer chamber 4012 form an effect of releasing the noise airflow, which ensures that the generation of additional noise is prevented while reducing and attenuating the noise airflow.

[0040] The structure of the silencer of this scheme is that the movement process of the noise airflow is that the noise airflow passes through the front cover 2 and enters the first silencer pipe 6, and the first silencer pipe 6 has a dispersion and noise reduction effect on the noise airflow, and then the noise airflow is dispersed on the first silencer pipe 6 and enters the first silencer chamber 5, and the first silencer chamber 5 further disperses and reduces the noise airflow, and the noise airflow is divided into two parts, one part enters the second silencer pipe 8 through the first through hole 4021 to be dispersed and reduced again, and the other part of the noise airflow passes through the second through hole 403 and enters the second silencer chamber 4011, and the second silencer chamber 4011 has a release and dispersion effect on the noise airflow, and at this time the noise airflow concentrated in the second silencer chamber 4011 is compressed into The noise airflow enters the compression release silencer channel 401, and moves along the hollow channel in the compression release silencer channel 401, and is gradually changed in direction and compressed, and then enters the third silencer chamber 4012. The third silencer chamber 4012 has a release and dispersion effect on the noise airflow, and the noise airflow enters the fourth silencer chamber 7 through the third through hole 404, and is further dispersed and reduced in the fourth silencer chamber 7. At this time, the intensity of the noise airflow is relatively low. After being dispersed again in the fourth silencer chamber 7, the remaining weak noise airflow enters the second silencer pipe 8, and is continuously dispersed and reduced in noise by the second silencer pipe 8, and finally is discharged to the outside of the rear cover 3 through the second silencer pipe 8, thereby achieving the compression release noise reduction effect of the whole process.

[0041] The structure of the partition assembly in this solution is that the second silencer chamber 4011 and the third silencer chamber 4012 are located at both ends of the compression release silencer channel 401, so that the noise airflow can enter from the second through hole 403 on the second silencer chamber 4011, and then enter the second silencer chamber 4011. The second silencer chamber 4011 is used to disperse the noise airflow, and the dispersed noise airflow enters the compression release silencer channel 401 again, mainly into the arc-shaped area channel of the compression release silencer channel 401. The noise airflow is changed in direction and compressed in the compression release silencer channel 401, so that the noise airflow is further reduced and weakened, and finally the noise airflow enters the third silencer chamber 4012. Inside, the noise airflow forms a certain release effect when flowing from the arc-shaped area channel of the compression release silencer channel 401 to the third silencer chamber 4012, thereby realizing further diffusion release of the noise airflow and realizing multi-stage compression release of the noise airflow, thereby reducing the movement intensity and noise level of the noise airflow; in order to achieve a relative sealing effect between the second silencer chamber 4011 and the third silencer chamber 4012 and prevent the overflow of the noise airflow, a barrier portion for separation is provided between the second silencer chamber 4011 and the third silencer chamber 4012, and the barrier portion realizes the division and barrier between the second silencer chamber 4011 and the third silencer chamber 4012, so that they form independent chambers.

[0042] The structure of the partition assembly of the present scheme is composed of the first partition 9 and the second partition 10. The compression release silencer channel 401 is formed by the first partition 9 and the second partition 10 being installed together. The first partition 9 and the second partition 10 are mainly installed and fitted together to form the compression release silencer channel 401 of the present scheme, and the second silencer chamber 4011 and the third silencer chamber 4012 of the present scheme are formed. The structure of the first partition 9 and the second partition 10 is convenient to form and can be pressed and formed by stainless steel plates. The first partition 9 and the second partition 10 are fixed together and installed together by crimping and snapping. The surfaces where the two are fitted and contacted can be provided with high temperature resistant seals to achieve mutual sealing effect on the compression release silencer channel 401, the second silencer chamber 4011 and the third silencer chamber 4012 to ensure that the noise airflow does not overflow and cross-link. The fixation between the two can also be achieved by welding.

[0043] Based on the structure of the partition assembly of the present solution, the structure of the first partition 9 and the second partition 10 can be set to the same structure. When installing, the first partition 9 only needs to be installed on one side and the second partition 10 needs to be installed on the other side. The two partitions can be installed together to form the overall structure of the partition assembly of the present solution. The first partition 9 and the second partition 10 have the same structure, which can be easily produced and have lower costs. It is also beneficial to maintain the stability and consistency of the partition assembly, so that the compression release silencer channel 401, the second silencer chamber 4011, and the third silencer chamber 4012 in the formed partition assembly have better sealing effects.

[0044] Optionally, in the present embodiment, the first silencer pipe 6 and the second silencer pipe 8 are configured as a tubular structure, that is, a hollow cylindrical tubular structure, and a plurality of silencer holes are provided on the side, so that the noise airflow entering the first silencer pipe 6 and the second silencer pipe 8 is dispersed and reduced in noise through the silencer holes, and enters the first silencer chamber 5 and the fourth silencer chamber 7 respectively for dispersion and noise reduction; wherein, the first silencer pipe 6 and the second silencer pipe 8 can also be configured as other shapes, such as a hollow directional structure, etc., which can achieve the dispersion and noise reduction effect of the noise airflow.

[0045] In order to facilitate the rapid installation of the front cover 2, the rear cover 3 and the outer shell 1, the front cover 2 and the rear cover 3 are all set to a structure connected to the outer shell 1 by curling and buckling, and a curling structure is set on the end faces of the front cover 2 and the rear cover 3. The end faces of the outer shell 1 on both sides are respectively inserted into the curling structures of the front cover 2 and the rear cover 3 to realize the limited clamping of the two ends of the outer shell 1, and can be forcibly fixed by interference clamping, which is convenient for installation and lower in cost. Among them, the structure on the partition assembly of the present invention is stamped and formed as one piece, and the second silencer chamber 4011, the third silencer chamber 4012, the compression release silencer channel 401 and other structures on the partition assembly are integrated together by stamping and forming as one piece. The mold can be used for stamping to maintain the stability and consistency of the partition assembly, and the standardized production of the partition assembly can be realized. The partition assembly of this scheme can reduce the amount of welding compared with the partition of the existing silencer, and the partition assembly is connected to the front cover 2 and the rear cover 3 by curling and buckling. The installation is simple, the process flow is reduced, and the cost of the partition assembly and the silencer is reduced.

[0046] Working principle: This scheme realizes multi-stage dispersed noise reduction of noise airflow by setting up multiple-stage silencer chambers, mainly setting up the first silencer chamber 5, the second silencer chamber 4011, the third silencer chamber 4012, and the fourth silencer chamber 7, and the second silencer chamber 4011 and the third silencer chamber 4012 are set in the partition assembly, and a compression release silencer channel 401 is set in the partition assembly to play a step-by-step compression and release of the noise airflow to achieve the compression release noise reduction effect, and the partition assembly has multiple silencer chambers to compress and release the noise airflow. The compression release silencer channel 401 and multiple silencer chambers are integrated with the first silencer tube 6 and the second silencer tube 8 to achieve the compression release effect and multi-stage dispersed noise reduction effect of the noise airflow. The noise airflow is compressed and released step by step in the compression release silencer channel 401, so that the noise airflow is gradually consumed and weakened, thereby achieving the noise reduction effect.

[0047] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present invention, and in actual applications, various changes may be made in form and detail without departing from the spirit and scope of the present invention, all of which are within the protection scope of the present invention.

Claims

1. A silencer, comprising: A shell, a front cover is installed at one end of the shell, and a rear cover is installed at the other end of the shell, characterized in that: a baffle assembly for silencing is installed between the front cover and the rear cover, and the baffle assembly is located in the shell; an annular hollow compression-release silencing channel is arranged in the baffle assembly, a second silencing chamber is arranged at one end of the compression-release silencing channel, and a third silencing chamber is arranged at the other end of the compression-release silencing channel; A plurality of evenly distributed second through holes are arranged on the side end surface of the partition assembly close to the front cover, and the noise airflow in the first silencing chamber can enter the second silencing chamber through the second through holes; A plurality of evenly distributed third through holes are arranged on the side end surface of the partition assembly close to the rear cover, and the noise airflow in the third silencing chamber can enter the fourth silencing chamber through the third through holes; The second silencer chamber and the third silencer chamber are both configured as hollow raised square structures, and the middle part of the compression-release silencer channel is configured as a raised arc-shaped structure to form an arc-shaped regional channel. The internal hollow cross-sections of the second silencer chamber and the third silencer chamber are larger than the internal hollow cross-sections of the middle part of the compression-release silencer channel, so that the noise airflow can enter from the second through hole on the second silencer chamber, and then enter into the second silencer chamber. The second silencer chamber is used to disperse the noise airflow, and the dispersed noise airflow then enters into the compression-release silencer channel and into the arc-shaped regional channel of the compression-release silencer channel. The noise airflow is changed in direction and compressed in the compression-release silencer channel, and finally the noise airflow enters into the third silencer chamber. A baffle for separation is provided between the second silencer chamber and the third silencer chamber, and the baffle realizes the partition and baffle between the second silencer chamber and the third silencer chamber to form independent chambers with each other. One end of the second silencer pipe is mounted on the baffle assembly, and the other end is mounted on the rear cover; A convex arc surface is provided at the position where the partition assembly is connected to the second silencer pipe, and a plurality of first through holes for silencer are provided on the arc surface, and the convex arc surface is provided in the middle of the partition assembly; The structure on the partition assembly is stamped and formed as one piece. The partition assembly includes a first partition and a second partition. The first partition and the second partition are arranged to have the same structure. When installing, the first partition is installed on one side and the second partition is installed on the other side. The two partitions are fitted together to form the overall structure of the partition assembly of this solution.

2. A muffler according to claim 1, characterized in that: A first silencing chamber is arranged between the front cover and the partition assembly, and a first silencing pipe is installed on the front cover and is located in the first silencing chamber.

3. A muffler according to claim 1, characterized in that: A fourth silencing chamber is arranged between the rear cover and the partition assembly, and the second silencing pipe is located in the fourth silencing chamber.

4. A muffler according to any one of claims 1 to 3, characterized in that: The front cover and the rear cover are connected to the outer shell by curling and buckling.

5. A muffler according to any one of claims 1 to 3, characterized in that: The first silencer pipe and the second silencer pipe are configured as tubular structures, and a plurality of silencer holes are provided on the side surfaces.

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