Muffler, exhaust equipment and exhaust system with dynamic sound

Abstract

The present invention discloses a muffler, an exhaust device and an exhaust system with dynamic sound, and relates to the technical field of automobile mufflers. The muffler includes a shell and a muffler pipe, the muffler pipe is arranged in the shell and one end is connected to the outside of the shell, and the other end is connected to the inner cavity of the shell, and the muffler pipe is provided with a bending portion. The muffler has a reasonable design, a simple structure, and is easy to produce. It can not only enhance the muffler performance of the low frequency band, but also enhance the muffler performance of the medium and high frequency bands, reduce the roar of the exhaust at low speed, and improve the dynamic sound quality.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile mufflers, and in particular to a muffler, exhaust equipment and an exhaust system with dynamic sound. Background Art

[0002] The current exhaust system noise reduction performance design is mostly aimed at reducing the noise sound pressure level. With the advancement of NVH technology, the noise sound pressure level of automobiles has been better controlled.

[0003] With the development of society, consumers' personalized requirements for automobiles are constantly increasing, so that the noise reduction characteristics and sound quality of some mufflers must not only meet the sound pressure level requirements, but also meet personalized requirements such as dynamic sound quality.

[0004] How to design an exhaust system that controls the exhaust noise sound pressure level and achieves both dynamic sound quality is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0005] The object of the present invention is to provide a muffler capable of controlling the sound pressure level and dynamic sound quality of exhaust noise.

[0006] The embodiment of the present invention is achieved as follows:

[0007] Based on the above purpose, an embodiment of the present invention provides a muffler, including a shell and a muffler pipe, wherein the muffler pipe is arranged in the shell and one end is connected to the outside of the shell, and the other end is connected to the inner cavity of the shell, and the muffler pipe is provided with a bending portion.

[0008] In addition, the muffler provided according to the embodiment of the present invention may also have the following additional technical features:

[0009] In an optional embodiment of the present invention, the bending portion includes a first arc segment, a first straight segment, a second arc segment and a second straight segment connected in sequence, a plurality of partitions are provided in the shell, and the inner cavity of the shell is divided into a first chamber, a second chamber, a third chamber and a fourth chamber by the plurality of partitions;

[0010] The first arc segment is located in the first chamber, the second arc segment is located in the fourth chamber, one end of the first arc segment away from the first straight segment is connected to the outside of the shell, and one end of the second straight segment away from the second arc segment is connected to the first chamber.

[0011] In an optional embodiment of the present invention, the volume of the first chamber is greater than the volume of the fourth chamber, and the volume of the fourth chamber is greater than the volume of the second chamber and the volume of the third chamber, respectively.

[0012] In an optional embodiment of the present invention, the first straight segment includes a guide portion, the guide portion is provided with a first guide hole connecting the inner cavity of the muffler and the third chamber, and the second arc segment is provided with a second guide hole connecting the inner cavity of the muffler and the fourth chamber;

[0013] The aperture of the first flow guiding hole is larger than the aperture of the second flow guiding hole, and the number of the first flow guiding holes is larger than the number of the second flow guiding holes.

[0014] In an optional embodiment of the present invention, the muffler also includes a first tail pipe and a second tail pipe, the first tail pipe is arranged in the first chamber to connect the second chamber with the outside, the second tail pipe is arranged in the fourth chamber and the third chamber to connect the second chamber with the outside, and the length of the first tail pipe is greater than the length of the second tail pipe.

[0015] The present invention also provides an exhaust device, comprising the above-mentioned muffler.

[0016] In an optional embodiment of the present invention, the exhaust device further includes a front muffler, and the front muffler is connected to one end of the muffler pipe through a first exhaust pipeline.

[0017] In an optional embodiment of the present invention, the front muffler includes a shell, a main muffler pipe and two front muffler baffles, the main muffler pipe is arranged in the inner cavity of the shell and is connected to the first exhaust pipeline, and the two front muffler baffles are arranged at intervals and divide the main muffler pipe into a first section, a second section and a third section;

[0018] The first section and the third section are both provided with first connecting holes, the second section is provided with second connecting holes, the number of the first connecting holes is greater than the number of the second connecting holes, and the diameter of the first connecting holes is smaller than the diameter of the second connecting holes.

[0019] The present invention also provides an exhaust system with dynamic sound, comprising the above exhaust device.

[0020] In an optional embodiment of the present invention, the exhaust system further comprises an exhaust hot end and a front muffler, and the exhaust hot end is connected to an end of the front muffler away from the muffler through a second exhaust pipeline.

[0021] The beneficial effects of the embodiments of the present invention are: reasonable design, simple structure, able to appropriately control the exhaust noise sound pressure level and produce dynamic sound quality, meet the personalized needs of consumers, and make the exhaust system noise low in sharpness, low in back pressure, and high consistency in the sound quality of the tail pipe noise on the left and right sides. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 A schematic diagram of a muffler provided in Embodiment 1 of the present invention from a first viewing angle;

[0024] Figure 2 is a schematic diagram of the muffler from a second perspective;

[0025] Figure 3 for Figure 1 Cross-sectional view of the middle and tail pipe connection;

[0026] Figure 4 A schematic diagram of an exhaust device provided in Example 2;

[0027] Figure 5 for Figure 4 Cross-sectional view of the mid-front muffler;

[0028] Figure 6 A schematic diagram of the structure of an exhaust system with dynamic sound provided in Embodiment 3;

[0029] Figure 7 It is the frequency band division and transmission loss performance curve.

[0030] Icons: 10-muffler; 11-shell; 112-first chamber; 113-second chamber; 114-third chamber; 116-fourth chamber; 12-muffler; 121-first arc segment; 123-first straight segment; 124-second arc segment; 126-second straight segment; 128-first guide hole; 129-second guide hole; 131-first baffle; 132-first perforation; 133-second baffle; 134-second perforation; 135-third baffle; 136-third perforation; 14-first tail pipe; 15-second tail pipe; 152-outer pipe section; 154-inner pipe section; 156-end wall; 20-exhaust equipment; 21-front muffler; 211-outer shell; 213-main muffler pipe; 215-front muffler baffle; 221-first section; 222-second section; 223-third section; 224-first connecting hole; 225-second connecting hole; 226-first chamber of front muffler; 227-second chamber of front muffler; 228-third chamber of front muffler; 25-first exhaust pipeline; 30-exhaust system; 31-exhaust hot end; 32-second exhaust pipeline; 324-first pipeline section; 326-second pipeline section; 328-flange pair. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0034] In the description of the present invention, it should be noted that the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0035] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "disposed" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] The embodiments of the present invention are described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways as defined and covered by the claims.

[0037] Example 1

[0038] Figure 1 This is a schematic diagram of the first viewing angle of the muffler 10 provided in this embodiment 1, Figure 2 is a schematic diagram of the muffler 10 from a second viewing angle, please refer to Figure 1 and Figure 2 shown.

[0039] The muffler 10 provided in this embodiment 1 is a muffler assembly component, which adopts a large-volume low-frequency muffler cavity structure and a muffler pipe 12 structure with a bending portion and a long length, which can greatly enhance the muffler performance in the low-frequency band.

[0040] The specific structures of the various components of the muffler 10 and the corresponding relationships between them are described in detail below.

[0041] The muffler 10 includes a shell 11, a muffler pipe 12, a partition, a first tail pipe 14 and a second tail pipe 15. The shell 11 is a cylindrical thin-walled hollow structure with an elliptical longitudinal section. The shell 11 includes a side wall and two opposite end walls 156. The muffler pipe 12 is penetrated through the side wall and is located in the shell 11. One end of the muffler pipe 12 is connected to the outside of the shell 11, and the other end is connected to the inner cavity of the shell 11. The first tail pipe 14 and the second tail pipe 15 are respectively penetrated through the two end walls 156, one end is located in the shell 11, and the other end is connected to the outside of the shell 11. The partition is arranged in the shell 11 at intervals to divide the inner cavity of the shell 11 into a plurality of chambers.

[0042] The muffler 12 is provided with a bending portion so that the muffler 12 is arranged in a circuitous manner in the shell 11. There are three partitions, which divide the inner cavity of the shell 11 into a first chamber 112, a second chamber 113, a third chamber 114 and a fourth chamber 116 in sequence.

[0043] Specifically, the bending portion includes a first arc segment 121, a first straight segment 123, a second arc segment 124, and a second straight segment 126, which are connected in sequence. The first arc segment 121 has a bending angle of about 90° and is located in the first chamber 112. The extension direction of the first straight segment 123 is the same as the central axis of the shell 11. The second arc segment 124 is located in the fourth chamber 116. The second straight segment 126 is parallel to the first straight segment 123. The end of the first arc segment 121 away from the first straight segment 123 is connected to the outside of the shell 11, and the end of the second straight segment 126 away from the second arc segment 124 is connected to the first chamber 112. The second arc segment 124 can also be in the form of stamped clam shell welding instead of the form of bent pipe.

[0044] Optionally, the first straight section 123 includes a guide portion, which has a first guide hole 128 connecting the inner cavity of the muffler 12 and the third chamber 114 , and the second arc section 124 has a second guide hole 129 connecting the inner cavity of the muffler 12 and the fourth chamber 116 .

[0045] Compared with the first guide hole 128 and the second guide hole 129, the aperture of the first guide hole 128 is larger than the aperture of the second guide hole 129, and the number of the first guide holes 128 is larger than the number of the second guide holes 129. The muffler 12 located inside the shell 11 is generally a U-shaped structure, that is, the first straight segment 123, the second arc segment 124 and the second straight segment 126 form a U-shaped structure. And the muffler 12 is made of stainless steel.

[0046] In this embodiment, the diameter of the first guide hole 128 is 8 mm, and the first guide hole 128 is not limited to a circular hole, but can also be a hole of other shapes such as a strip, an ellipse, a rectangle, etc.

[0047] The first chamber 112, the second chamber 113, the third chamber 114 and the fourth chamber 116 are separated in sequence by a plurality of partitions. The volume of the first chamber 112 is greater than that of the fourth chamber 116. The first chamber 112 is connected to the silencer pipe 12 and is mainly used to eliminate low-frequency noise. The volume of the fourth chamber 116 is greater than that of the second chamber 113 and the third chamber 114. The fourth chamber 116 is filled with sound-absorbing cotton for broadband sound absorption. The sound-absorbing cotton is made of fiber material and is mainly used for high-frequency noise. The volume of the second chamber 113 and the volume of the third chamber 114 may be equal or unequal, but their volumes are both smaller than that of the fourth chamber 116 and are used for broadband sound absorption.

[0048] Optionally, the second chamber 113 , the third chamber 114 , and the fourth chamber 116 need to avoid forming a long expansion chamber to properly control the sound attenuation in the mid-frequency band.

[0049] Optionally, the first tail pipe 14 passes through the first chamber 112 to connect the second chamber 113 with the outside. When the structural arrangement of the muffler 10 is limited, the length of the first tail pipe 14 is greater than the length of the second tail pipe 15, and the diameter of the first tail pipe 14 is larger than the diameter of the second tail pipe 15, so that the pipe pressure loss of the first tail pipe 14 and the second tail pipe 15 are consistent, and the consistency of sound quality is improved. It can be understood that this embodiment needs to control the total length (effective tail pipe length) of the first tail pipe 14 and the second tail pipe 15 respectively to generate pipe resonance standing waves of appropriate frequency to increase the dynamic quality of the sound.

[0050] The second tail pipe 15 penetrates the fourth chamber 116 and the third chamber 114 to connect the second chamber 113 with the outside, and the length of the first tail pipe 14 is greater than that of the second tail pipe 15 for wide-band noise reduction.

[0051] In this embodiment, there are three partitions, namely the first partition 131, the second partition 133 and the third partition 135, and the first partition 131, the second partition 133 and the third partition 135 are arranged in parallel and spaced apart, thereby dividing the inner cavity of the shell 11 into a first chamber 112, a second chamber 113, a third chamber 114 and a fourth chamber 116.

[0052] Optionally, the first partition plate 131 is provided with a first through hole 132 for connecting the first chamber 112 and the second chamber 113. The number of the first through holes 132 is small and the aperture is small, and they are mainly used for tuning, so that the transmission loss transition can be uniform; the second partition plate 133 is provided with a second through hole 134, and the second through hole 134 is used to connect the second chamber 113 and the third chamber 114. The number of the second through holes 134 is greater than the number of the first through holes 132, and the aperture of the second through hole 134 is slightly larger than the aperture of the first through hole 132, and they are mainly used for air flow and tuning; the third partition plate 135 is provided with a third through hole 136, and the third through hole 136 is used to connect the third chamber 114 and the fourth chamber 116. The number of the third through holes 136 is greater than the number of the second through holes 134, and the aperture of the third through hole 136 is smaller than the aperture of the second through hole 134, and they are mainly used for tuning.

[0053] Optionally, both the first partition 131 and the second partition 133 are provided with ribs for strengthening the partitions and reducing the sound radiation of the partitions. The shape of the third partition 135 is substantially the same as that of the second partition 133, with only the number and diameter of the perforations being different.

[0054] Optionally, the two end walls 156 of the shell 11 are respectively the first end cover and the second end cover. The first tail pipe 14 passes through the first chamber 112 and then passes out from the first end cover. The second end cover is consistent in shape with the first end cover and is symmetrically distributed. The second tail pipe 15 passes through the third chamber 114 and the fourth chamber 116 and then passes out from the second end cover. Both the first end cover and the second end cover are convex outward to enhance the strength of the shell 11 and increase the volume of the first chamber 112 and the fourth chamber 116.

[0055] Figure 3 For the tail pipe connection cross-sectional view, please refer to Figure 3 shown.

[0056] In this embodiment, the shell 11 is formed by rolling, and the two ends of the shell 11 are respectively connected to the first end cover and the second end cover by welding, which is easy to form. The first tail pipe 14 includes an outer pipe section 152 and an inner pipe section 154 connected to each other, and the second tail pipe 15 also includes an outer pipe section 152 and an inner pipe section 154 connected to each other. The outer pipe section 152 and the inner pipe section 154 are connected at the end wall 156 of the shell 11, and the outer pipe section 152 and the inner pipe section 154 are connected and inserted into the hole of the end wall 156, and finally sealed by welding. The upstream components of the airflow are connected in the form of extending into the downstream components, which can reduce the risk of flow noise and reduce the sharpness of the sound.

[0057] Optionally, the outer pipe sections 152 of the first tail pipe 14 and the second tail pipe 15 are both bent by 90°, which can better reduce flow noise.

[0058] The muffler 10 provided in this embodiment adopts a structural form of a large-volume low-frequency muffler cavity and a muffler pipe 12 with a bent portion, which greatly enhances the muffler performance in the low-frequency band. The mid- and high-frequency muffler performance is enhanced by setting a partition and filling muffler cotton. The inner cavity of the muffler pipe 12 and the third chamber 114 are connected through the first guide hole 128, so that the airflow in the first straight section 123 of the muffler pipe 12 flows to the third chamber 114, and the muffler capacity of the low-frequency muffler cavity is fully utilized, thereby improving the muffler performance in the low-frequency band, reducing the exhaust roar at low speed, and improving the dynamic sound quality.

[0059] The first tail pipe 14 and the second tail pipe 15 are designed to have different diameters, and the length of the first tail pipe 14 is greater than the length of the second tail pipe 15, but the diameter of the first tail pipe 14 is greater than the diameter of the second tail pipe 15, thereby improving the consistency of the sound quality of the exhaust tail pipes on the left and right sides. By properly controlling the equivalent tail pipe length, the standing wave frequency is in the range of 150 to 300 Hz, thereby enhancing the dynamic sound quality.

[0060] It can be understood that the connection method of the tail pipe can also be applied to other similar connection positions.

[0061] The muffler 10 provided in Example 1 of the present invention has the beneficial effects of reasonable design, simple structure, and easy production. It can not only enhance the muffler performance in the low-frequency band, but also enhance the muffler performance in the medium and high frequency bands, reduce the exhaust roar at low speeds, and improve the dynamic sound quality.

[0062] Example 2

[0063] Embodiment 2 of the present invention provides an exhaust device 20, including the muffler 10 provided in Embodiment 1, and the exhaust device 20 further includes a front muffler 21, and the front muffler 21 is connected to one end of the muffler pipe 12 through a first exhaust pipeline 25.

[0064] Figure 4 is a schematic diagram of the exhaust device 20, Figure 5 for Figure 4 For a cross-sectional view of the mid-front muffler 21, please refer to Figure 4 and Figure 5 As shown, the front muffler 21 will be described in detail below.

[0065] The front muffler 21 includes an outer shell 211, a main muffler pipe 213 and two front muffler baffles 215. The main muffler pipe 213 is a columnar structure, which is passed through the inner cavity of the outer shell 211 and is connected to the first exhaust pipe 25. The two front muffler baffles 215 are arranged at intervals and divide the main muffler pipe 213 into a first section 221, a second section 222 and a third section 223.

[0066] The first section 221 and the third section 223 are both provided with first connecting holes 224 , the second section 222 is provided with second connecting holes 225 , the number of the first connecting holes 224 is greater than the number of the second connecting holes 225 , and the aperture of the first connecting holes 224 is smaller than the aperture of the second connecting holes 225 .

[0067] The two front muffler baffles 215 divide the inner cavity of the outer shell 211 into a first front muffler chamber 226, a second front muffler chamber 227 and a third front muffler chamber 228. By opening a second connecting hole 225 on the second section 222 of the main muffler pipe 213, a similar acoustic effect can be achieved, and the exhaust back pressure can be reduced to improve the power performance.

[0068] Optionally, the outer shell 211 is a cylindrical structure with a circular thin wall in the longitudinal section, and end cones are formed at both ends by a spinning process, and are connected to the first exhaust pipe 25 by welding. That is, both ends of the first exhaust pipe 25 are respectively connected to the front muffler 21 and the muffler 10 by welding.

[0069] It is understandable that the outer shell 211 may be formed in other ways, for example, the outer shell body and the stamped end cover may be connected to each other instead of the spun end cone on the outer shell 211 .

[0070] Optionally, the first front chamber 226 is used for mid-high frequency broadband sound elimination, and sound-absorbing cotton is arranged in the first front chamber 226, and sound-absorbing cotton is also arranged in the third front chamber 228. The sound-absorbing cotton is made of fiber material. Compared with the first front chamber 226 and the third front chamber 228, the volume of the second front chamber 227 is small, and the first front chamber 226, the second front chamber 227 and the third front chamber 228 are all used for mid-high frequency broadband sound elimination.

[0071] Optionally, the front muffler 215 is made of stainless steel, and is provided with air guide holes, and the number of air guide holes is large and the aperture is small, which is used to connect two adjacent chambers. The front muffler 21 is mainly for mid-high frequency muffler, so that the noise sound pressure level of the exhaust device 20 is appropriate and has dynamic sound quality.

[0072] Example 3

[0073] Embodiment 3 of the present invention provides an exhaust system 30 with dynamic sound, including the exhaust device 20 provided in Embodiment 2, and is specifically described as follows:

[0074] Figure 6 is a schematic diagram of the exhaust system 30, please refer to Figure 6 shown.

[0075] The exhaust system 30 includes a front muffler 21 and an exhaust hot end 31, and the exhaust hot end 31 is connected to an end of the front muffler 21 away from the muffler 10 through a second exhaust pipeline 32. An exhaust gas purification carrier is arranged inside the exhaust hot end 31. The second exhaust pipeline 32 includes a first pipeline section 324 and a second pipeline section 326, wherein the first pipeline section 324 is connected to the exhaust hot end 31 through a flange pair 328, and a section of the first pipeline section 324 close to the exhaust hot end 31 is a flexible device, which has the effect of reducing vibration.

[0076] Optionally, the first pipeline section 324 and the second pipeline section 326 are connected via a flange pair 328 , one end of the second pipeline is fixedly connected to the flange pair 328 by welding, and the other end is also fixedly connected to the front muffler 21 by welding.

[0077] It is understandable that the flange pair 328 can be replaced by other clamp-type sealing connectors, and the specific form is not limited, but it must meet the fixed connection and sealing functions.

[0078] The present invention is realized based on the design integration of the exhaust device 20, the front muffler 21 and the exhaust hot end 31, rather than differentiating the exhaust manifold length or modifying the engine ignition control strategy, and its advantages and characteristics are better reflected in the car equipped with a supercharged engine. When the car is running, the exhaust gas burned in the engine cylinder passes through the exhaust manifold or the supercharger, enters the exhaust system 30 provided in this embodiment, passes through the exhaust hot end 31, the front muffler 21 and the muffler 10 in sequence, and is finally discharged into the atmosphere through the first tail pipe 14 and the second tail pipe 15.

[0079] Figure 7 For frequency band division and transmission loss performance curve, please refer to Figure 7 As shown. The horizontal axis is the frequency, the unit is Hz, and the vertical axis is the transmission loss at the corresponding frequency, the unit is decibel (dB); in general, the greater the transmission loss at the corresponding frequency, the greater the noise reduction effect, and the smaller the noise sound pressure level at this frequency.

[0080] Among them, the exhaust hot end 31 and the first and second exhaust pipes 32 have a certain muffler effect. When the airflow passes through the front muffler 21, the connecting holes and perforations connect the adjacent pipes and chambers in sequence, forming an impedance composite muffler 10, which mainly reduces high-frequency noise and part of medium and low-frequency noise. When the airflow passes through the muffler 10, the muffler unit formed by each component mainly reduces the low-frequency component, high-frequency component and part of the medium-frequency component. Finally, the target transmission loss and target sound quality are achieved, making the overall trend as follows Figure 7 The transmission loss curve B is shown in FIG.

[0081] The transmission loss curve C calculated using the preferred structure of the design basically meets the requirement trend line B. There is a large transmission loss in the frequency band R1, an appropriate transmission loss in the frequency band R2, and a large transmission loss in the frequency band R3, thereby reducing the main order energy, appropriately increasing the harmonic and half-order energy in the R2 interval, and reducing high-frequency energy components such as flow noise, thereby achieving an appropriate sound pressure level with dynamic sound quality.

[0082] Figure 7 As shown in the middle curve D, because the first through hole 132 is added to the first partition plate 131, the curve transition is smooth, and the valley value increases at the frequency position where the frequency bands R1 and R2 intersect, thereby improving the exhaust noise linearity and the exhaust sound quality.

[0083] Therefore, the exhaust system 30 provided in this embodiment can appropriately control the exhaust noise sound pressure level and produce dynamic sound quality, meet the personalized needs of consumers, and make the exhaust system 30 have the advantages of low noise sharpness, low back pressure, and high consistency of noise sound quality at the tail pipe outlets on the left and right sides.

[0084] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0085] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A muffler, characterized in that: It comprises a shell and a muffler, wherein the muffler is arranged in the shell and one end of the muffler is connected to the outside of the shell, and the other end is connected to the inner cavity of the shell, and the muffler is provided with a bending portion; The bending portion includes a first arc segment, a first straight segment, a second arc segment and a second straight segment connected in sequence, a plurality of partitions are arranged in the shell, and the inner cavity of the shell is divided into a first chamber, a second chamber, a third chamber and a fourth chamber by the plurality of partitions; The first arc segment is located in the first chamber, the second arc segment is located in the fourth chamber, one end of the first arc segment away from the first straight segment is connected to the outside of the housing, and one end of the second straight segment away from the second arc segment is connected to the first chamber; The volume of the first chamber is greater than the volume of the fourth chamber, and the volume of the fourth chamber is greater than the volume of the second chamber and the volume of the third chamber respectively; The first straight segment includes a guide portion, the guide portion is provided with a first guide hole connecting the inner cavity of the muffler and the third chamber, and the second arc segment is provided with a second guide hole connecting the inner cavity of the muffler and the fourth chamber; The aperture of the first flow guide hole is larger than the aperture of the second flow guide hole, and the number of the first flow guide holes is larger than the number of the second flow guide holes; The muffler also includes a first tail pipe and a second tail pipe, the first tail pipe is arranged in the first chamber to connect the second chamber with the outside, the second tail pipe is arranged in the fourth chamber and the third chamber to connect the second chamber with the outside, and the length of the first tail pipe is greater than the length of the second tail pipe.

2. An exhaust device, characterized in that: The invention comprises the muffler as claimed in claim 1.

3. The exhaust device according to claim 2, characterized in that: The exhaust device further comprises a front muffler, and the front muffler is connected to one end of the muffler pipe through a first exhaust pipeline.

4. The exhaust device according to claim 3, characterized in that: The front muffler comprises a shell, a main muffler pipe and two front muffler baffles, the main muffler pipe is arranged in the inner cavity of the shell and is connected with the first exhaust pipe, and the two front muffler baffles are arranged at intervals and divide the main muffler pipe into a first section, a second section and a third section; The first section and the third section are both provided with first connecting holes, the second section is provided with second connecting holes, the number of the first connecting holes is greater than the number of the second connecting holes, and the aperture of the first connecting holes is smaller than the aperture of the second connecting holes.

5. An exhaust system with dynamic sound, characterized in that: The exhaust device comprises the exhaust device according to any one of claims 2 to 4.

6. The exhaust system according to claim 5, characterized in that The exhaust system further comprises an exhaust hot end and a front muffler, wherein the exhaust hot end is connected to an end of the front muffler away from the muffler via a second exhaust pipeline.

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