A dual cylinder engine unit muffler

Abstract

The utility model discloses a double -cylinder engine unit silencer, including the box, the box both ends are equipped with the expansion chamber with the engine tail gas inlet pipe intercommunication, and the middle part is equipped with the expansion chamber, the expansion chamber all is equipped with the sound -absorbing pipe and the expansion chamber intercommunication, and the expansion chamber is equipped with the sound -absorbing pipe and the exhaust pipe of box outside setting intercommunication, and the exhaust pipe is equipped with the resonance cavity in. The utility model discloses the expansion chamber + expansion chamber + resonance cavity of setting in the box carry out multistage sound -absorbing treatment to the airflow, and the processing efficiency of noise has been improved.

Description

Technical Field

[0001] This utility model belongs to the field of muffler technology, specifically relating to a muffler for a two-cylinder engine. Background Technology

[0002] During engine operation, high-speed airflow and mechanical vibration generate a significant amount of noise. This noise not only affects environmental comfort but can also cause long-term damage to equipment and human health. Therefore, silencers are necessary to reduce this noise. As a traditional noise reduction device, conventional silencers employ a single-process approach: first amplifying the airflow, then processing it through silencer holes. They primarily rely on the dispersion effect of the amplified airflow and the basic silencing effect of the silencer holes, failing to pre-process the turbulent noise at the airflow source and lacking precise cancellation structures for specific frequency sound waves. Therefore, their effectiveness in handling complex frequency spectrum noise is limited, resulting in insufficient noise reduction efficiency and specificity. Utility Model Content

[0003] To address the aforementioned shortcomings of existing technologies, a muffler for a two-cylinder engine is provided, which solves the problem of poor noise reduction effect in existing mufflers.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A muffler for a two-cylinder engine includes a housing. The housing has expansion chambers at both ends that are connected to the engine exhaust intake pipe, and an expansion chamber in the middle. Each expansion chamber is equipped with a muffler pipe that is connected to the expansion chamber. The expansion chamber is also equipped with a muffler pipe that is connected to an exhaust pipe located outside the housing. The exhaust pipe is equipped with a resonant cavity.

[0006] By employing the above structural design, the airflow is compressed through the expansion chamber, reducing turbulent noise caused by airflow disturbance. The first silencing process is completed through the silencer pipe, suppressing some noise at its source. After the first silencing process, the airflow enters the expansion chamber. The impedance change caused by the sudden expansion of the airflow volume enhances sound wave reflection and interference. The second silencing process is then completed through the silencer pipe, further weakening mid- and low-frequency noise. Finally, the airflow passes through the resonant cavity in the exhaust pipe to cancel out sound waves of specific frequencies, thus dispersing the airflow and achieving silencing. Therefore, this invention improves the noise reduction efficiency through multi-stage silencing.

[0007] As a further improvement, the expansion chamber and the expansion chamber are separated by a partition. The silencing pipe in the expansion chamber has several silencing holes, and one end of the silencing pipe is fixed to the partition and communicates with the expansion chamber.

[0008] As a further improvement, the silencer pipe in the expansion chamber has a double-layer silencer structure. The silencer pipe has several silencer holes, and both ends of the silencer pipe are fixed to the box body, with one end connected to the exhaust pipe.

[0009] With the above structural design, the silencing pipe in the expansion chamber adopts a double-layer silencing structure, which can further improve the noise reduction effect.

[0010] As a further improvement, one end of the exhaust pipe is connected to the silencer pipe inside the expansion chamber, and the other end is fixedly mounted on the housing by a mounting plate, and the exhaust pipe is provided with several exhaust holes.

[0011] As a further improvement, the box is a multi-layered, integrally molded structure, consisting of a mesh panel, insulation cotton, and outer shell from the inside out.

[0012] The above structural design not only improves the strength of the enclosure but also provides a certain degree of heat insulation, preventing burns from overheating.

[0013] As a further improvement, the expansion chambers at both ends of the housing are designed to be symmetrical.

[0014] As a further improvement, the housing is provided with mounting ears.

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

[0016] This invention utilizes an expansion chamber to compress airflow, reducing turbulent noise caused by airflow disturbances. A first-stage noise reduction process, achieved through a silencer pipe, suppresses some noise at its source. After this first-stage noise reduction, the airflow enters the expansion chamber. The sudden increase in airflow volume creates impedance changes, enhancing sound wave reflection and interference, thus improving attenuation efficiency. A second-stage noise reduction process, also achieved through the silencer pipe, further weakens low- and mid-frequency noise. Finally, the airflow passes through a resonant cavity within the exhaust pipe to neutralize sound waves of specific frequencies, dispersing the airflow and achieving further noise reduction. Therefore, this invention employs a multi-stage noise reduction process—combining an expansion chamber, a resonant cavity, and a diaphragm—to improve noise reduction efficiency. Attached Figure Description

[0017] Figure 1 This is a perspective view of the present utility model;

[0018] Figure 2 yes Figure 1 A sectional view;

[0019] Figure 3 This is an exploded view of the present invention.

[0020] In the picture:

[0021] 1. Housing, 1a. Mesh plate, 1b. Insulation cotton, 1c. Outer shell, 1d. Mounting ear, 2. Engine exhaust intake pipe, 3. Expansion chamber, 4. Silencer pipe, 5. Exhaust pipe, 6. Resonance cavity, 6a. Exhaust hole, 6b. Partition plate, 7. Mounting plate, 8. Detailed Implementation

[0022] To explain in detail the technical content, structural features, objectives and effects of this utility model, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0023] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] Please refer to 1 to Figure 3 A muffler for a twin-cylinder engine includes a housing 1, which is a multi-layered, integrally formed structure consisting of a mesh panel 1a, heat insulation cotton 1b, and an outer shell 1c from the inside out. The housing 1 has mounting ears 1d for easy installation and fixation of the muffler. Expansion chambers 3, connected to the engine exhaust intake pipe 2, are located at both ends of the housing 1. These chambers compress the airflow to reduce turbulent noise caused by airflow disturbances, thereby reducing broadband noise at its source. In this embodiment, the expansion chambers 3 at both ends are symmetrically designed. An expansion chamber 4 is located in the middle of the housing 1. The compressed airflow expands through the expansion chamber 4, utilizing the impedance change caused by the sudden change in airflow volume to enhance the reflection and interference of mid-to-low frequency noise, thus improving attenuation efficiency. Each expansion chamber 3 has a muffler pipe 5 connected to the expansion chamber 4. The expansion chamber 4 also has a muffler pipe 5 connected to an exhaust pipe 6 located outside the housing 1. The exhaust pipe 6 contains a resonant cavity 6a to cancel out sound waves of specific frequencies, thus dispersing the airflow and providing muffler treatment.

[0025] Please continue reading. Figure 2 and Figure 3 Specifically, the expansion chamber 3 and the expansion chamber 4 are separated by a partition 7. The silencing pipe 5 inside the expansion chamber 3 has several silencing holes, and one end of the silencing pipe 5 is fixed to the partition 7 and communicates with the expansion chamber 4. The working principle of the silencing pipe 5 is conventional technology in this field and will not be elaborated upon here.

[0026] Please see Figure 2The silencer pipe 5 inside the expansion chamber 4 has a double-layer silencer structure. The silencer pipe 5 has several silencer holes. Both ends of the silencer pipe 5 are fixed to the housing 1, and one end is connected to the exhaust pipe 6. One end of the exhaust pipe 6 is connected to the silencer pipe 5 inside the expansion chamber 4, and the other end is fixedly mounted to the housing 1 via a mounting plate 8. The exhaust pipe 6 has several exhaust holes 6b.

[0027] The working principle of this utility model is as follows:

[0028] Both expansion chambers 3 of the muffler are connected to the engine exhaust intake pipe 2. Exhaust gas enters the expansion chamber 3, where it is compressed, reducing turbulent noise caused by airflow disturbance. The muffler then passes through the muffler pipe 5 within the expansion chamber 3 for initial noise reduction, thus reducing broadband noise at its source. Next, the airflow enters the expansion chamber 4. The sudden expansion of the airflow volume creates an impedance change, enhancing sound wave reflection and interference, improving attenuation efficiency. This second noise reduction process, occurring within the expansion chamber 4 and its internal muffler pipe 5, further weakens low- and mid-frequency noise. Finally, the airflow passes through the resonant cavity 6a within the exhaust pipe 6 to dissipate and reduce the noise of specific frequencies.

[0029] In summary, this utility model uses an expansion chamber 3, an expansion chamber 4, and a resonant cavity 6a to perform multi-stage noise reduction on the airflow, thereby achieving noise reduction across multiple frequency bands and improving noise processing efficiency.

[0030] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments disclosed and described above, and some modifications and changes to this utility model should also fall within the protection scope of the claims of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model.

Claims

1. A twin-cylinder engine unit silencer comprising a casing (1), characterized in that, The housing (1) has expansion chambers (3) at both ends that are connected to the engine exhaust intake pipe (2), and an expansion chamber (4) in the middle. Each expansion chamber (3) is equipped with a muffler pipe (5) that is connected to the expansion chamber (4). The expansion chamber (4) is equipped with a muffler pipe (5) that is connected to the exhaust pipe (6) outside the housing (1). The exhaust pipe (6) is equipped with a resonant cavity (6a).

2. A twin-bank engine assembly silencer as claimed in claim 1, characterised in that The expansion chamber (3) and the expansion chamber (4) are separated by a partition (7). The silencing pipe (5) in the expansion chamber (3) has several silencing holes, and one end of the silencing pipe (5) is fixed to the partition (7) and communicates with the expansion chamber (4).

3. A twin-bank engine assembly muffler as set forth in claim 1 wherein, The muffler pipe (5) inside the expansion chamber (4) has a double-layer muffler structure. Several muffler holes are provided on the muffler pipe (5). Both ends of the muffler pipe (5) are fixed to the box body (1), and one end is connected to the exhaust pipe (6).

4. A twin-bank engine assembly muffler as set forth in claim 1 wherein, One end of the exhaust pipe (6) is connected to the silencer pipe (5) in the expansion chamber (4), and the other end is fixedly mounted on the box body (1) by the mounting plate (8). The exhaust pipe (6) is provided with several exhaust holes (6b).

5. A twin-bank engine assembly muffler as set forth in claim 1 wherein, The box (1) is a multi-layer structure integrally formed, consisting of a mesh plate (1a), heat insulation cotton (1b), and outer shell (1c) from the inside out.

6. A twin-bank engine assembly muffler as set forth in claim 1 wherein, The expansion chambers (3) at both ends of the box (1) are designed symmetrically.

7. A twin-bank engine assembly muffler as set forth in claim 1 wherein, The housing (1) is provided with mounting ears (1d).

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