A twin-cylinder muffler

Abstract

This utility model provides a dual-cylinder muffler, including a first housing, two intake pipes, a second housing, a third housing, an exhaust pipe, a muffler tube, and sound-absorbing cotton. A second chamber communicates with both first chambers. Both the second and third housings are located within the second chambers. The second housing contains a third chamber, and the third housing contains a fourth chamber. One end of the exhaust pipe communicates with the third chamber. The exhaust pipe passes through the fourth chamber and extends out of the first housing. Multiple first muffler holes are provided on the wall of the exhaust pipe in the fourth chamber. A first gap is formed between the muffler tube and the exhaust pipe, and a second gap is formed between the muffler tube and the third housing. Sound-absorbing cotton fills the second gap. By opening first muffler holes on the exhaust pipe, opening second muffler holes on the muffler tube, setting the first and second gaps, and filling the second gap with sound-absorbing cotton, noise can be efficiently filtered, significantly reducing exhaust noise and improving the overall muffler effect.

Description

Technical Field

[0001] This utility model relates to the field of muffler technology, specifically to a dual-cylinder muffler. Background Technology

[0002] During the operation of a twin-cylinder engine, a large amount of noisy exhaust is produced. Existing twin-cylinder mufflers often have a relatively simple silencing structure design, with unreasonable internal chamber design and poor airflow, making it difficult to effectively reduce exhaust noise. This results in poor silencing performance, affecting not only the engine's exhaust efficiency but also failing to meet increasingly stringent noise emission standards. Therefore, there is an urgent need for a twin-cylinder muffler with superior silencing performance to solve these problems. Utility Model Content

[0003] In view of the deficiencies in the prior art, the purpose of this utility model is to provide a dual-cylinder muffler to solve or at least alleviate one or more of the above-mentioned technical problems or other problems existing in the prior art.

[0004] To achieve the above objectives, this utility model provides a dual-cylinder muffler, comprising a first housing having two first chambers and a second chamber located between the two first chambers, the second chamber being connected to both first chambers respectively; two intake pipes being connected to the two first chambers respectively; a second housing disposed within the second chamber, the second housing having a third chamber connected to the second chamber; a third housing disposed within the second chamber, the third housing having a fourth chamber; an exhaust pipe having one end connected to the third chamber, the exhaust pipe passing through the fourth chamber and extending out of the first housing, the exhaust pipe having multiple first silencing holes on the pipe wall of the fourth chamber; a silencing pipe disposed within the fourth chamber and sleeved on the exhaust pipe, the silencing pipe having multiple second silencing holes, a first gap forming between the silencing pipe and the exhaust pipe, a second gap forming between the silencing pipe and the third housing; and silencing cotton filling the second gap.

[0005] Preferably, the second housing is provided with a plurality of third silencing holes, and the second cavity and the third cavity are connected through the third silencing holes.

[0006] Preferably, the third silencing hole is located on the side of the second housing opposite to the third housing.

[0007] Preferably, the exhaust pipe has multiple fourth silencer holes on the pipe wall of the third chamber.

[0008] Preferably, the outlet of the exhaust pipe located in the third cavity is provided with a plug.

[0009] Preferably, it further includes two first partitions, each of which has a plurality of fifth silencers. Each first partition is located in the corresponding first cavity. The first partitions divide the first cavity into a first sub-chamber and a second sub-chamber. The air intake pipe is connected to the first sub-chamber, and the second sub-chamber is connected to the second cavity.

[0010] Preferably, it further includes two second partitions, which divide the inner cavity of the first housing into a second cavity and two first cavities; the second partitions are provided with a plurality of sixth silencing holes, and the first cavity and the second cavity are connected through the sixth silencing holes.

[0011] Preferably, the two ends of the second housing are respectively connected to two second partitions, the two ends of the second housing are open, and the two second partitions respectively block the two ports of the second housing.

[0012] Preferably, the third housing is disposed on the second housing.

[0013] Preferably, the exhaust end of the exhaust pipe is provided with a spark extinguisher.

[0014] The beneficial effects of this utility model are:

[0015] This utility model discloses a dual-cylinder muffler, which, through the design of two first chambers, can simultaneously receive the exhaust gas from a dual-cylinder engine, achieving the purpose of synchronous silencing of the dual-cylinder engine exhaust. The exhaust gas passes sequentially through the intake pipe, the first chamber, the second chamber, the third chamber, and the exhaust pipe. During the airflow process, the expansion of the chambers and the reversal of the airflow achieve multi-stage silencing.

[0016] Meanwhile, by creating a first silencer hole and a second silencer hole on the exhaust pipe, setting a first gap and a second gap, and filling the second gap with sound-absorbing cotton, some of the exhaust gas entering the exhaust pipe from the third chamber will enter the first gap through the first silencer hole, and the noise-reduced exhaust gas will then enter the second gap through the second silencer hole, making full contact with the sound-absorbing cotton. The sound-absorbing cotton can absorb sound wave energy through its porous structure, effectively filtering noise and significantly reducing exhaust noise, thus improving the overall silencing effect. The existence of the first gap and the second gap also provides a buffer space for the exhaust flow, reducing the additional noise generated by airflow impact.

[0017] Furthermore, the second and third housings are designed within the second cavity of the first housing, resulting in a compact layout of components that effectively reduces the overall volume of the muffler. This facilitates installation and arrangement on the engine and allows it to adapt to different installation space requirements. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0019] Figure 1 This is a schematic diagram of the structure of a dual-cylinder muffler provided in an embodiment of the present invention;

[0020] Figure 2 This is a partial schematic diagram of the second and third shells;

[0021] Figure 3 This is a schematic diagram of the structure after the first shell portion is hidden;

[0022] Figure 4 for Figure 3 A structural schematic diagram from another perspective under the condition;

[0023] Figure label:

[0024] 10. First housing; 11. First cavity; 111. First sub-cavity; 112. Second sub-cavity; 12. Second cavity; 13. First partition; 131. Fifth silencer hole; 14. Second partition; 141. Sixth silencer hole; 20. Intake pipe; 30. Second housing; 31. Third cavity; 32. Third silencer hole; 40. Third housing; 50. Exhaust pipe; 51. First silencer hole; 52. Fourth silencer hole; 53. Plug; 60. Silencer pipe; 61. Second silencer hole; 70. Silencing cotton; 80. First gap; 90. Spark extinguisher. Detailed Implementation

[0025] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0026] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application shall have the ordinary meaning as understood by one of ordinary skill in the art to which this utility model pertains.

[0027] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0028] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly defined.

[0029] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0031] like Figure 1-4As shown, in one embodiment of this utility model, a dual-cylinder muffler is provided, including a first housing 10, two intake pipes 20, a second housing 30, a third housing 40, an exhaust pipe 50, a muffler pipe 60, and sound-absorbing cotton 70. The first housing 10 has two first chambers 11 and a second chamber 12 located between the two first chambers 11. The second chamber 12 communicates with both first chambers 11. The two intake pipes 20 are fixedly installed on the first housing 10 and communicate with both first chambers 11. The second housing 30 is fixedly installed inside the second chamber 12, and a third chamber 31 is provided inside the second housing 30, communicating with the second chamber 12. The third housing 40 is fixedly installed inside the second chamber 12, and a fourth chamber is provided inside the third housing 40. One end of the exhaust pipe 50 communicates with the third chamber 31, and the exhaust pipe 50 extends out of the first housing 10 after passing through the fourth chamber. Multiple first muffler holes 51 are provided on the pipe wall of the exhaust pipe 50 in the fourth chamber. The muffler 60 is fixedly installed in the fourth cavity and sleeved on the outside of the exhaust pipe 50. The muffler 60 is provided with a plurality of second muffler holes 61. A first gap 80 is formed between the muffler 60 and the exhaust pipe 50. A second gap is formed between the muffler 60 and the third housing 40. The muffler cotton 70 is filled in the second gap.

[0032] This embodiment discloses a dual-cylinder muffler, which, by designing two first chambers 11, can simultaneously receive the exhaust gas from a dual-cylinder engine, achieving the purpose of synchronous silencing of the dual-cylinder engine exhaust. The exhaust gas passes sequentially through the intake pipe 20, the first chamber 11, the second chamber 12, the third chamber 31, and the exhaust pipe 50. During the airflow process, multi-stage silencing is achieved through the expansion of the chambers and the reversal of the airflow.

[0033] Meanwhile, by opening a first muffler hole 51 on the exhaust pipe 50, a second muffler hole 61 on the muffler pipe 60, setting a first gap 80 and a second gap, and filling the second gap with sound-absorbing cotton 70, a portion of the exhaust gas entering the exhaust pipe 50 from the third chamber 31 will enter the first gap 80 through the first muffler hole 51. The noise-reduced exhaust gas will then enter the second gap through the second muffler hole 61, making full contact with the sound-absorbing cotton 70. The sound-absorbing cotton 70 can absorb sound wave energy through its porous structure, effectively filtering noise and significantly reducing exhaust noise, thus improving the overall muffler effect. The existence of the first gap 80 and the second gap also provides a buffer space for the exhaust flow, reducing the additional noise generated by airflow impact.

[0034] Furthermore, the second housing 30 and the third housing 40 are designed inside the second cavity 12 of the first housing 10. The compact layout of each component effectively reduces the overall volume of the muffler, making it easy to install and arrange on the engine and adapt to different installation space requirements.

[0035] In one embodiment, the second housing 30 is provided with a plurality of third silencer holes 32, and the second cavity 12 and the third cavity 31 are connected through the third silencer holes 32. By opening the third silencer holes 32 on the second housing 30, the exhaust gas entering the second cavity 12 can enter the third cavity 31 in an orderly manner, avoiding the problem of airflow obstruction caused by the accumulation of exhaust gas in the second cavity 12. At the same time, the setting of the third silencer holes 32 also plays a certain preliminary silencing role. When the exhaust gas passes through the third silencer holes 32, the airflow is dispersed, and part of the noise energy is consumed, further improving the overall silencing effect and laying the foundation for the subsequent silencing treatment of the exhaust pipe 50 and the silencer pipe 60.

[0036] In one embodiment, the third silencing hole 32 is located on the side of the second housing 30 opposite to the third housing 40. This structural design allows the exhaust gas entering the second chamber 12 to fully diffuse and flow within the second chamber 12, improving the uniformity of airflow and ensuring the stability and effectiveness of subsequent silencing treatment. Simultaneously, it allows the exhaust gas entering the third chamber 31 from the second chamber 12 to form a more reasonable airflow path, preventing the exhaust gas from directly impacting the third housing 40 and related components, thus reducing airflow impact noise.

[0037] In one embodiment, the exhaust pipe 50 has multiple fourth silencer holes 52 on the wall of the third chamber 31. The fourth silencer holes 52 increase the passage for exhaust gas to enter the exhaust pipe 50, allowing the exhaust gas in the third chamber 31 to enter the exhaust pipe 50 more quickly and evenly, preventing exhaust gas from stagnating in the third chamber 31, further ensuring smooth exhaust flow and improving exhaust efficiency. Simultaneously, as the exhaust gas passes through the fourth silencer holes 52, the airflow is further dispersed, noise energy is further weakened, and the silencing effect is enhanced.

[0038] In one embodiment, the exhaust pipe 50 has a plug 53 at its opening within the third chamber 31. The plug 53 forces the exhaust gas in the third chamber 31 to pass through the fourth muffler hole 52 before entering the exhaust pipe 50, ensuring that the muffler effect of the fourth muffler hole 52 is fully utilized. Simultaneously, this design also extends the residence time of the exhaust gas within the third chamber 31, allowing the buffering and noise reduction effect of the third chamber 31 to be more fully realized, further reducing noise and improving the muffler effect, thus avoiding the problem of insufficient muffler effect caused by exhaust gas directly and quickly passing through the exhaust pipe 50 opening.

[0039] In one embodiment, the first housing 10 further includes two first partitions 13, each with a plurality of fifth silencing holes 131. Each first partition 13 is located within a corresponding first cavity 11, dividing the first cavity 11 into a first sub-cavity 111 and a second sub-cavity 112. The first sub-cavity 111 and the second sub-cavity 112 are connected through the fifth silencing holes 131. The air intake pipe 20 is connected to the first sub-cavity 111, and the second sub-cavity 112 is connected to the second cavity 112.

[0040] The first chamber 11 is divided into two sub-chambers by the first partition 13, allowing the exhaust gas to pass through the first sub-chamber 111 and the second sub-chamber 112 before entering the second chamber 12, thus achieving primary noise reduction. The exhaust gas initially diffuses within the first sub-chamber 111 before entering the second sub-chamber 112 through the fifth noise reduction hole 131. During this process, noise energy is further dissipated. The fifth noise reduction hole 131 controls the exhaust flow speed, preventing rapid exhaust flow from generating vortex noise and improving the overall noise reduction effect.

[0041] The arrangement of the first sub-chamber 111 and the second sub-chamber 112 can buffer and stabilize the incoming exhaust gas, preventing airflow turbulence caused by the exhaust gas directly and rapidly entering the second chamber 12. This allows the airflow to enter the subsequent chambers more smoothly, ensuring the stability and effectiveness of the subsequent silencing process. At the same time, it also reduces the impact of airflow impact on the internal components of the muffler.

[0042] In one embodiment, the first housing 10 further includes two second partitions 14, which divide the inner cavity of the first housing 10 into a second cavity 12 and two first cavities 11. The second partitions 14 are provided with a plurality of sixth silencing holes 141, through which the first cavities 11 and the second cavities 12 communicate. By dividing the inner cavity of the first housing 10 into the middle second cavity 12 and the two first cavities 11 on either side using the two second partitions 14, the function of each chamber is more clearly defined, facilitating separate processing and centralized silencing of the dual-cylinder exhaust, ensuring the orderly progress of the silencing process. Simultaneously, the exhaust gas enters the second cavity 12 through the sixth silencing holes 141, further consuming noise energy and improving the overall silencing effect.

[0043] In addition, the second partition 14 not only serves to separate the chambers, but also enhances the overall structural strength of the first housing 10, making the first housing 10 more stable when subjected to exhaust gas pressure and external vibration, and reducing the risk of deformation and damage to the muffler during use.

[0044] In one embodiment, the two ends of the second housing 30 are respectively welded to two second partition plates 14, with the two ends of the second housing 30 being open. The two second partition plates 14 respectively seal the two ports of the second housing 30. This structural design not only ensures the formation of a closed third cavity 31 within the second housing 30, ensuring that exhaust gas can flow between the chambers according to a preset path, but also eliminates the need for additional end caps to seal the two ports of the second housing 30, reducing material usage and lowering costs. Furthermore, the connection method between the second housing 30 and the two second partition plates 14 ensures that the second housing 30 is stably fixed within the second cavity 12, preventing displacement or loosening of the second housing 30 due to vibration or other factors during the use of the muffler. This ensures the stability and reliability of the overall muffler structure and extends its service life.

[0045] In one embodiment, the third housing 40 is fixedly mounted on the second housing 30. This arrangement makes full use of the space within the second cavity 12, further optimizing the internal structural layout of the muffler, making the connections between components more compact and reasonable, reducing the overall volume of the muffler, and facilitating installation and arrangement. Simultaneously, this arrangement provides stable support and fixation for the third housing 40, preventing displacement or shaking during use, ensuring that the silencing tube 60 and the silencing cotton 70 can function properly, and improving the reliability and stability of the overall muffler structure.

[0046] In one embodiment, the exhaust end of the exhaust pipe 50 is provided with a spark eliminator 90, which can effectively eliminate sparks in the exhaust gas discharged from the exhaust pipe 50, avoid safety accidents caused by spark discharge, and greatly improve the safety of the muffler during use.

[0047] Numerous specific details are set forth in this specification. However, it will be understood that embodiments of this invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.

Claims

1. A two-cylinder muffler, characterized by, include: The first housing (10) has two first cavities (11) and a second cavity (12) located between the two first cavities (11), the second cavity (12) being connected to the two first cavities (11) respectively; Two air inlet pipes (20) are respectively connected to the two first chambers (11); A second housing (30) is disposed within the second cavity (12), and a third cavity (31) is provided within the second housing (30), the third cavity (31) being in communication with the second cavity (12); A third housing (40) is disposed within the second cavity (12), and a fourth cavity is provided within the third housing (40); An exhaust pipe (50) is connected at one end to the third cavity (31). The exhaust pipe (50) passes through the fourth cavity and extends out of the first housing (10). The exhaust pipe (50) is provided with a plurality of first silencer holes (51) on the pipe wall of the fourth cavity. A muffler (60) is disposed within the fourth cavity and sleeved outside the exhaust pipe (50). The muffler (60) has multiple second muffler holes (61). A first gap (80) is formed between the muffler (60) and the exhaust pipe (50), and a second gap is formed between the muffler (60) and the third housing (40). Sound-absorbing cotton (70) is filled into the second gap.

2. The dual cylinder muffler of claim 1, wherein The second housing (30) is provided with a plurality of third silencing holes (32), and the second cavity (12) and the third cavity (31) are connected through the third silencing holes (32).

3. The dual cylinder muffler of claim 2, wherein, The third silencing hole (32) is located on the side of the second housing (30) away from the third housing (40).

4. The dual cylinder muffler of claim 1, wherein The exhaust pipe (50) is provided with a plurality of fourth silencer holes (52) on the pipe wall of the third chamber (31).

5. The dual cylinder muffler of claim 4, wherein, The exhaust pipe (50) located in the third chamber (31) has a plug (53) at its opening.

6. The dual-cylinder muffler according to claim 1, characterized in that, It also includes two first partitions (13), each first partition (13) having a plurality of fifth silencer holes (131). Each first partition (13) is located in the corresponding first cavity (11). The first partition (13) divides the first cavity (11) into a first sub-cavity (111) and a second sub-cavity (112). The air inlet pipe (20) is connected to the first sub-cavity (111), and the second sub-cavity (112) is connected to the second cavity (12).

7. The dual cylinder muffler of claim 1, wherein It also includes two second partitions (14), which divide the inner cavity of the first housing (10) into a second cavity (12) and two first cavities (11); the second partitions (14) are provided with a plurality of sixth silencing holes (141), and the first cavity (11) and the second cavity (12) are connected through the sixth silencing holes (141).

8. The dual-cylinder muffler of claim 7, wherein The two ends of the second housing (30) are respectively connected to two second partitions (14). The two ends of the second housing (30) are open, and the two second partitions (14) respectively block the two ports of the second housing (30).

9. The dual-cylinder muffler of claim 8, wherein The third housing (40) is disposed on the second housing (30).

10. The dual cylinder muffler of claim 1, wherein, The exhaust end of the exhaust pipe (50) is provided with a spark eliminator (90).

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