Double-layer silencer and motorcycle

Abstract

The invention discloses a double-layer silencer and a motorcycle, and relates to the field of exhaust emission devices.The double-layer silencer comprises a front-section silencing assembly, a rear-section silencing assembly and a rear-section silencing assembly, the rear section noise elimination assembly is connected with the front section noise elimination assembly, a first layer noise elimination device and a second layer noise elimination device are arranged in the rear section noise elimination assembly, a first spiral flow channel and a second spiral flow channel which are communicated are arranged in the first layer noise elimination device, and the first spiral flow channel and the second spiral flow channel form spiral air channels with the inner wall of the rear section noise elimination assembly; and the first spiral flow channel and the second spiral flow channel are communicated with the second-layer silencer. According to the double-layer silencer and the motorcycle, through the arrangement of the first spiral flow channel and the second spiral flow channel, high-temperature and high-pressure air flow is converted into spiral air flow when passing through the spiral air channel, the kinetic energy of tail gas of an engine can be reduced, and the noise reduction effect is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of exhaust gas emission devices, and more specifically, to a double-layer muffler. In addition, the present invention also relates to a motorcycle including the above double-layer muffler. Background Art

[0002] Due to the high-temperature and high-pressure gas generated by the engine after the gas in the engine cylinder pushes the piston to do work, a large amount of noise will be generated during emission. In order to reduce the noise, generally, the exhaust gas discharged from the engine enters the exhaust muffler for noise reduction treatment. The existing exhaust mufflers use a combination of catalysts and chambers to reduce the noise of the muffler, which not only increases the manufacturing cost and occupies a large space, but also contains a large amount of dust particles in the exhaust gas, which will pollute the air when discharged into the air. At the same time, since the gas inside the muffler will form water droplets when cooled, it is easy to cause the cylinder body of the muffler to rust, affecting the exhaust process and further affecting the appearance of the muffler.

[0003] In summary, how to improve the noise reduction ability of the muffler is an urgent problem to be solved by those skilled in the art at present. Summary of the Invention

[0004] In view of this, an object of the present invention is to provide a double-layer muffler. The rear-stage noise reduction component of the double-layer muffler has a first-layer muffler and a second-layer muffler. The first-layer muffler is provided with a first spiral flow channel and a second spiral flow channel, which can change the high-temperature and high-pressure gas into a spiral air flow, improving the noise reduction effect.

[0005] Another object of the present invention is to provide a motorcycle including the above double-layer muffler.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A double-layer muffler, comprising:

[0008] A front-stage noise reduction component, which is communicated with the engine exhaust port;

[0009] A rear-stage noise reduction component, which is connected to the front-stage noise reduction component. The interior of the rear-stage noise reduction component has a first-layer muffler and a second-layer muffler. The first-layer muffler is provided with a first spiral flow channel and a second spiral flow channel that are communicated. The first spiral flow channel and the second spiral flow channel both form spiral air channels with the inner wall of the rear-stage noise reduction component, and the first spiral flow channel and the second spiral flow channel are both communicated with the second-layer muffler.

[0010] Preferably, the first layer of muffler includes the first spiral flow channel, the first air guide groove and the first collection cavity. The housing of the rear-stage muffling component is of a tubular structure, and a partition is provided in the middle. The partition is provided with perforations, and the first collection cavity is provided at the perforations. The first collection cavity is communicated with the first spiral flow channel through the first air guide groove.

[0011] Preferably, the first layer of muffler further includes the second spiral flow channel, the second air guide groove, the second collection cavity and the exhaust pipe. The second collection cavity is communicated with the second spiral flow channel through the second air guide groove. The two ends of the exhaust pipe are respectively communicated with the second collection cavity and the second layer of muffler.

[0012] Preferably, overflow pipes are provided on both the first spiral flow channel and the second spiral flow channel. Both the first spiral flow channel and the second spiral flow channel are communicated with the second layer of muffler through the overflow pipes.

[0013] Preferably, the second layer of muffler includes a first chamber, a second chamber, a third chamber and a fourth chamber separated by a plurality of baffles respectively. The baffle between the first chamber and the second chamber is provided with perforations, and the baffle between the third chamber and the fourth chamber is also provided with the perforations. A ventilation pipe is provided on the baffle between the second chamber and the third chamber, and a plurality of through holes are provided on the ventilation pipe.

[0014] Preferably, a conical exhaust pipe is further included. The fourth chamber and the exhaust pipe are both communicated with the conical exhaust pipe.

[0015] Preferably, sound-absorbing cotton is provided in the conical exhaust pipe.

[0016] Preferably, drain holes are provided on the second layer of muffler, the first collection cavity and the second collection cavity.

[0017] Preferably, the structures and sizes of the first spiral flow channel and the second spiral flow channel are the same, and / or, the first spiral flow channel is a structure obtained by magnifying the second spiral flow channel by a factor of two in equal proportion.

[0018] A motorcycle includes a double-layer muffler, and the double-layer muffler is the double-layer muffler of any one of the above.

[0019] A double-layer muffler provided by the present invention includes a front-stage muffling component and a rear-stage muffling component. Inside the rear-stage muffling component, there is a first-layer muffler and a second-layer muffler. Inside the first-layer muffler, there are a first spiral flow channel and a second spiral flow channel. The first spiral flow channel and the second spiral flow channel can form a spiral air duct with the inner wall of the rear-stage muffling component. The front-stage muffling component is connected to the engine exhaust port. The gas discharged from the engine exhaust port can pass through the front-stage muffling component and enter the rear-stage muffling component. The gas can successively pass through the spiral air duct formed by the first spiral flow channel and the second spiral flow channel. When the high-temperature and high-pressure air flow passes through the spiral air duct, it is transformed into a spiral air flow, which can reduce the kinetic energy of the engine exhaust gas. The swirl muffler makes the air flow discharge more smoothly, improves the low-speed torque of the engine, enhances the acceleration performance of the engine, and improves the noise reduction effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the provided drawings.

[0021] Figure 1 It is a schematic diagram of the internal structure of the double-layer muffler provided by the present invention;

[0022] Figure 2 It is a schematic diagram of the air flow direction inside the double-layer muffler provided by the present invention;

[0023] Figure 3 It is a schematic diagram of the structure of the second spiral flow channel and the overflow pipe assembly provided by the present invention.

[0024] Reference Numerals:

[0025] 1 - Front-stage muffling component; 2 - First-layer muffler; 3 - First spiral flow channel; 4 - First air guiding groove; 5 - First collection chamber; 6 - Rear-stage muffling component; 7 - Second spiral flow channel; 8 - Second air guiding groove; 9 - Second collection chamber; 10 - Exhaust pipe; 11 - Second-layer muffler; 12 - First chamber; 13 - Second chamber; 14 - Third chamber; 15 - Fourth chamber; 16 - Sound-absorbing cotton; 17 - Conical exhaust pipe; 18 - Overflow pipe; 19 - Vent pipe. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0027] The core of the present invention is to provide a double-layer muffler that can convert the linear motion of the air flow into a spiral air flow and improve the noise reduction ability of the muffler.

[0028] Another core of the present invention is to provide a motorcycle including the above double-layer muffler.

[0029] It should be noted that the orientation or positional relationship indicated by "upper", "lower", "front", "rear", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0030] A double-layer muffler provided by the present application is connected to the engine exhaust port and includes a front-stage muffling component 1 and a rear-stage muffling component 6.

[0031] Among them, the front-stage muffling component 1 is communicated with the engine exhaust port.

[0032] The rear-stage muffling component 6 is connected to the front-stage muffling component 1. The inside of the rear-stage muffling component 6 has a first-layer muffler 2 and a second-layer muffler 11. A first spiral flow channel 3 and a second spiral flow channel 7 which are communicated are arranged in the first-layer muffler 2. Both the first spiral flow channel 3 and the second spiral flow channel 7 form spiral air channels with the inner wall of the rear-stage muffling component 6, and both the first spiral flow channel 3 and the second spiral flow channel 7 are communicated with the second-layer muffler 11.

[0033] Specifically, for the structure of the double-layer muffler, please refer to the attached Figure 1 , for the structures of the first spiral flow channel 3 and the second spiral flow channel 7, please refer to the attached Figure 3 , for the gas flow direction, please refer to the attached Figure 2, the front muffling component 1 is a conical tube communicating with the engine exhaust port. The base of the rear muffling component 6 is a tubular housing. The rear muffling component 6 includes a first muffler 2 and a second muffler 11. Both the first muffler 2 and the second muffler 11 are tubular structures. A first spiral flow channel 3 and a second spiral flow channel 7 are arranged in the first muffler 2. A spiral air duct can be formed between the first spiral flow channel 3 and the second spiral flow channel 7 and the inner wall of the first muffler 2. The high-temperature and high-pressure gas discharged from the engine exhaust port can enter the rear muffling component 6 through the front muffling component 1. In particular, the high-temperature and high-pressure gas can first enter the spiral air duct between the first spiral flow channel 3 and the rear muffling component 6, and then enter the spiral air duct between the second spiral flow channel 7 and the rear muffling component 6. Compared with the prior art where the high-temperature and high-pressure gas flows along the inner wall of the straight tube, the high-temperature and high-pressure gas at the engine exhaust port of the present application can be converted into a spiral air flow, which can not only reduce the kinetic energy of the engine exhaust gas, but also the gas passes through the overflow pipe for secondary silencing in the two-layer muffler, achieving the effect of high-efficiency noise reduction. Compared with the catalyst, the swirl muffler makes the gas discharge smoother, improves the low-speed torque of the engine, and improves the acceleration performance of the engine.

[0034] On the basis of the above embodiment, the first muffler 2 includes a first spiral flow channel 3, a first air guide groove 4 and a first collection cavity 5. The housing of the rear muffling component 6 is a tubular structure, and a partition is provided in the middle. There is a perforation on the partition, and a first collection cavity 5 is provided at the perforation. The first collection cavity 5 is communicated with the first spiral flow channel 3 through the first air guide groove 4.

[0035] Specifically, please refer to the appendix Figure 1 , a partition is provided in the middle of the rear muffling component 6, and the partition separates the first muffler 2 and the second muffler 11. The first muffler 2 includes a first spiral flow channel 3, a first air guide groove 4 and a first collection cavity 5. The first collection cavity 5 is communicated with the first spiral flow channel 3 through the first air guide groove 4. The high-temperature and high-pressure gas discharged from the engine exhaust port can successively pass through the first spiral flow channel 3, the first air guide groove 4 and the first collection cavity 5 for the first spiral flow to achieve noise reduction. There is a perforation on the partition, and the gas in the first collection cavity 5 can pass through the partition through the perforation and enter the left part of the rear muffling component 6, that is, the part of the second spiral flow channel 7 for the second spiral flow to achieve the second noise reduction.

[0036] On the basis of the above embodiment, the first muffler 2 further includes a second spiral flow channel 7, a second air guide groove 8, a second collection cavity 9 and an exhaust pipe 10. The second collection cavity 9 is communicated with the second spiral flow channel 7 through the second air guide groove 8. The two ends of the exhaust pipe 10 are respectively communicated with the second collection cavity 9 and the second muffler 11.

[0037] Specifically, a second spiral flow channel 7, a second air guide groove 8, a second collection chamber 9, and an exhaust pipe 10 are arranged in the left chamber of the first muffler 2. The left side of the second spiral flow channel 7 is sequentially communicated with the second air guide groove 8, the second collection chamber 9, and the exhaust pipe 10. The gas flowing from the right side of the rear muffler assembly 6 into the left side can enter the spiral air channel between the second spiral flow channel 7 and the inner wall of the rear muffler assembly 6, converting the gas into spiral-flowing gas for the second time, further reducing the kinetic energy of the gas itself, and thus effectively reducing the noise of the engine.

[0038] On the basis of the above-mentioned embodiment, overflow pipes 18 are provided on both the first spiral flow channel 3 and the second spiral flow channel 7. The first spiral flow channel 3 and the second spiral flow channel 7 are both communicated with the second muffler 11 through the overflow pipes 18.

[0039] Specifically, L-shaped overflow pipes 18 are provided on the right sides of both the first spiral flow channel 3 and the second spiral flow channel 7. A second muffler 11 is provided on the first muffler 2. The first spiral flow channel 3 and the second spiral flow channel 7 are both communicated with the second muffler 11 through the overflow pipes 18. After the kinetic energy of the gas is reduced by the first spiral flow channel 3 and the second spiral flow channel 7, it enters the second muffler 11 for secondary sound attenuation.

[0040] On the basis of the above-mentioned embodiment, the second muffler 11 includes a first chamber 12, a second chamber 13, a third chamber 14, and a fourth chamber 15 separated by a plurality of baffles respectively. There are perforations on the baffle between the first chamber 12 and the second chamber 13, and there are also perforations on the baffle between the third chamber 14 and the fourth chamber 15. A ventilation pipe 19 is provided on the baffle between the second chamber 13 and the third chamber 14, and a plurality of through holes are provided on the ventilation pipe 19.

[0041] Specifically, the first chamber 12 and the second chamber 13 are separated from each other by a baffle, and perforations are opened between the baffles so that the gas enters the second chamber 13 through the perforations. The second chamber 13 and the third chamber 14 are also separated by a partition, but a ventilation pipe 19 is provided in the middle of the partition, and through holes are opened in the ventilation pipe 19. The gas enters the third chamber 14 through the through holes in the ventilation pipe 19. The third chamber 14 and the fourth chamber 15 are separated from each other by a baffle, and perforations are opened between the baffles so that the gas enters the fourth chamber 15 through the perforations. The gas with reduced kinetic energy flows from the first air guide groove 4 to the second muffler 11 through the overflow pipe 18, and the noise of the exhaust gas is further reduced through the combined action of the first chamber 12, the second chamber 13, the third chamber 14, and the fourth chamber 15 in the second muffler 11.

[0042] On the basis of the above-mentioned embodiment, a conical exhaust pipe 17 is further included. The fourth chamber 15 and the exhaust pipe 10 are both communicated with the conical exhaust pipe 17.

[0043] Specifically, a conical exhaust pipe 17 is provided on the side of the second muffler 11 facing away from the front muffler component 1. As the last part of the double-layer muffler, the conical exhaust pipe 17 is used to discharge the gas discharged from the engine exhaust port. The exhaust pipe 10 and the fourth chamber 15 are both connected to the conical exhaust pipe 17, which means that finally at least two paths of gas can converge and be discharged from the conical exhaust pipe 17.

[0044] Based on the above embodiment, sound-absorbing cotton 16 is provided inside the conical exhaust pipe 17.

[0045] Specifically, sound-absorbing cotton 16 is provided inside the conical exhaust pipe 17, which finally performs noise reduction treatment on the gas and discharges the gas through the conical exhaust pipe 17.

[0046] Optionally, sound-absorbing cotton can be provided in both the first muffler 2 and the second muffler 11 to improve the sound absorption effect.

[0047] Based on the above embodiment, drain holes are provided in the second muffler 11, the first collection chamber 5, and the second collection chamber 9.

[0048] Specifically, the particles in the high-temperature and high-pressure exhaust gas discharged from the engine exhaust port will be thrown onto the inner wall of the rear muffler component 6 due to different centrifugal forces generated by the principle of cyclone dust removal and finally converge in the first collection chamber 5. When the remaining gas passes through the second spiral flow channel 7, the kinetic energy of the gas can be reduced for the second time. A part of the gas enters the second muffler 11 through the second air guide groove 8 and the overflow pipe 18, and the reduced gas is discharged under the combined action of the third chamber 14, the fourth chamber 15, and the conical exhaust pipe 17. Another part of the gas enters the conical exhaust pipe 17 through the exhaust pipe 10 to discharge the gas and purify the exhaust gas. The particles in the exhaust gas will also be separated for the second time and be thrown to the side wall surface and finally converge in the second collection chamber 9. When the temperature is relatively low, the water vapor in the exhaust gas will condense when it meets the cold. When the motorcycle travels for a short time, the gas in the muffler will condense into water, resulting in oxidation and even damage of the cylinder body. At this time, drain holes are provided in the second muffler 11 chamber, and the water enters the first spiral flow channel 3 and the second spiral flow channel 7 respectively from the drain holes, and finally converges in the first collection chamber 5 and the second collection chamber 9 under the principle of cyclone separation. Drain holes are provided in the collection chamber, and the water is finally discharged from the cylinder body. The water in the first muffler 2 will converge in the first collection chamber 5 and the second collection chamber 9 under the action of the first air guide groove 4 and the second air guide groove 8, and drain holes are provided in the collection chamber and finally discharged from the cylinder body.

[0049] Based on the above embodiment, the structures and sizes of the first spiral flow channel 3 and the second spiral flow channel 7 are the same, and / or, the first spiral flow channel 3 is a structure obtained by magnifying the second spiral flow channel 7 by a factor of two in equal proportion.

[0050] Specifically, both the first spiral flow channel 3 and the second spiral flow channel 7 are provided with overflow pipes 18, air guiding grooves, collection chambers, and each spiral flow channel has 5 spiral blades, arranged at 72°C. In order to achieve more efficient noise reduction and dust removal, the second spiral flow channel 7 can be the same size as the first spiral flow channel 3 or can be reduced by half proportionally. The specific situation needs to be selected according to the cost.

[0051] Generally speaking, the double-layer muffler provided in this application includes a front-stage muffling component 1 and a rear-stage muffling component 6. The front-stage muffling component 1 is connected to the engine exhaust port. The rear-stage muffling component 6 is the main protected object of this application. The rear-stage muffling component 6 includes a second-layer muffler 11 located in the upper part and a first-layer muffler 2 located in the lower part. A partition is provided in the middle of the first-layer muffler 2, and the partition divides the first-layer muffler 2 into left and right chambers. A first spiral flow channel 3, a first air guiding groove 4, and a first collection chamber 5 are sequentially connected in the right chamber. The first collection chamber 5 is connected to the perforations provided on the partition. An overflow pipe 18 is provided on the right side of the first spiral flow channel 3 and is connected to the first chamber 12 through the overflow pipe 18. A second spiral flow channel 7, a second air guiding groove 8, a second collection chamber 9, and an exhaust pipe 10 are sequentially connected in the left chamber. An overflow pipe 18 is provided on the right side of the second spiral flow channel 7 and is connected to the third chamber 14 through the overflow pipe 18. Drain holes are provided in both the first collection chamber 5 and the second collection chamber 9. The second-layer muffler 11 includes a first chamber 12, a second chamber 13, a third chamber 14, and a fourth chamber 15 separated by baffles. A ventilation pipe with through holes is provided between the second chamber 13 and the third chamber 14. The exhaust pipe 10 is arranged in the fourth chamber 15, and the fourth chamber 15 is connected to a conical exhaust pipe 17 through the exhaust pipe 10.

[0052] When the double-layer muffler provided by the present application is in use, the front-stage muffling component 1 is connected to the exhaust port of the engine. At this time, the gas enters the rear-stage muffling component 6. The gas first passes through the first spiral flow channel 3, and the gas changes from the original linear motion to spiral motion, reducing the kinetic energy of the gas. The noise of the exhaust gas is effectively reduced, and the noise of the reduced gas is reduced. The reduced gas flows from the first air guide groove 4 through the overflow pipe 18 to the second-layer muffler 11. In the second-layer muffler 11, the noise of the exhaust gas is further reduced through the combined action of the first chamber 12, the second chamber 13, the third chamber 14, and the fourth chamber 15. Finally, the gas passes through the conical exhaust pipe 17 to achieve the effect of further reducing the noise and finally discharging the gas. The particles present in the exhaust gas will be thrown to the side wall due to different centrifugal forces generated by the principle of cyclone dust removal and finally converge in the first collection chamber 5. When the residual gas passes through the second spiral flow channel 7 to reduce the kinetic energy of the gas for the second time, a part of the gas enters the second-layer muffler 11 through the second air guide groove 8 and the overflow pipe 18. After the combined action of the third chamber 14, the fourth chamber 15, and the conical exhaust pipe 17, the reduced gas is discharged. Another part of the gas enters the conical exhaust pipe 17 through the exhaust pipe 10 to discharge the gas and purify the exhaust gas. The particles present in the exhaust gas will also be separated for the second time and be thrown to the side wall surface and finally converge in the second collection chamber 9. When the temperature is relatively low, the water vapor in the exhaust gas will condense into water when it meets the cold. When the motorcycle travels for a short time, the gas in the muffler will condense into water, resulting in oxidation and damage of the cylinder body. At this time, small holes are opened in the second-layer muffler 11, and the water enters the first spiral flow channel 3 and the second spiral flow channel 7 respectively from the small holes. Finally, the water converges in the first collection chamber 5 and the second collection chamber 9 under the principle of cyclone separation. Small holes are opened in the collection chamber, and the water is finally discharged from the cylinder body. The water in the first-layer muffler 2 will converge in the first collection chamber 5 and the second collection chamber 9 under the action of the first air guide groove 4 and the second air guide groove 8. Small holes are opened in the collection chamber, and finally the water is discharged from the cylinder body

[0053] In addition to the above double-layer muffler, the present invention also provides a motorcycle including the double-layer muffler disclosed in the above embodiment. For the structures of other parts of the motorcycle, reference can be made to the prior art and will not be elaborated herein.

[0054] In this specification, the various embodiments are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same or similar parts between the various embodiments, reference can be made to each other.

[0055] The above has introduced in detail a double-layer muffler and a motorcycle provided by the present invention. Specific examples are used in this article to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can still be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A double-layer muffler is provided and connected to the engine exhaust port, characterized in that, Comprising: A front-stage muffling component (1), which is communicated with the engine exhaust port; A rear-stage muffling component (6), which is connected to the front-stage muffling component (1). Inside the rear-stage muffling component (6), there is a first muffler (2) and a second muffler (11). A first spiral flow channel (3) and a second spiral flow channel (7) which are communicated are arranged inside the first muffler (2). The first spiral flow channel (3) and the second spiral flow channel (7) both form spiral air channels with the inner wall of the rear-stage muffling component (6), and the first spiral flow channel (3) and the second spiral flow channel (7) are both communicated with the second muffler (11).

2. The double-layer muffler according to claim 1, characterized in that, The first muffler (2) includes the first spiral flow channel (3), a first air guiding groove (4) and a first collecting cavity (5). The housing of the rear-stage muffling component (6) is of a tubular structure, and a partition plate is arranged in the middle. There are perforations on the partition plate, and the first collecting cavity (5) is arranged at the perforations. The first collecting cavity (5) is communicated with the first spiral flow channel (3) through the first air guiding groove (4).

3. The double-layer muffler according to claim 2, characterized in that, The first muffler (2) further includes the second spiral flow channel (7), a second air guiding groove (8), a second collecting cavity (9) and an exhaust pipe (10). The second collecting cavity (9) is communicated with the second spiral flow channel (7) through the second air guiding groove (8). The two ends of the exhaust pipe (10) are respectively communicated with the second collecting cavity (9) and the second muffler (11).

4. The double-layer muffler according to claim 3, characterized in that, Overflow pipes (18) are arranged on both the first spiral flow channel (3) and the second spiral flow channel (7). The first spiral flow channel (3) and the second spiral flow channel (7) are both communicated with the second muffler (11) through the overflow pipes (18).

5. The double-layer muffler according to claim 4, characterized in that The second muffler (11) includes a first chamber (12), a second chamber (13), a third chamber (14) and a fourth chamber (15) which are separated by a plurality of baffles respectively. There are perforations on the baffle between the first chamber (12) and the second chamber (13), and there are also the perforations on the baffle between the third chamber (14) and the fourth chamber (15). A ventilation pipe (19) is arranged on the baffle between the second chamber (13) and the third chamber (14), and a plurality of through holes are arranged on the ventilation pipe (19).

6. The double-layer muffler according to claim 5, wherein, It further includes a conical exhaust pipe (17), and the fourth chamber (15) and the exhaust pipe (10) are both communicated with the conical exhaust pipe (17).

7. The double-layer muffler according to claim 6, wherein Sound-absorbing cotton (16) is arranged inside the conical exhaust pipe (17).

8. The double-layer muffler according to any one of claims 5 to 7, characterized in that, Drainage holes are opened on the second muffler (11), the first collecting cavity (5) and the second collecting cavity (9).

9. The double-layer muffler according to claim 8, characterized in that The structures and sizes of the first spiral flow channel (3) and the second spiral flow channel (7) are the same, and / or, the first spiral flow channel (3) is a structure obtained by magnifying the second spiral flow channel (7) by a factor of two in equal proportion.

10. A motorcycle, comprising a double-layer muffler, characterized in that, The double-layer muffler is the double-layer muffler according to any one of claims 1 to 9.

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