A muffler system simultaneously solving low frequency noise and shock wave problems

Abstract

The utility model relates to a kind of simultaneously solve muffler system of low-frequency noise and shock wave problem, including muffler intake pipe 1, muffler shell 2 and muffler outlet pipe 3, the muffler intake pipe 1 be connected in the top of muffler shell 2, the muffler outlet pipe 3 be connected in the side of muffler shell 2.The muffler system of simultaneously solving low-frequency noise and shock wave problem of the utility model is adopted, by the design extension muffler outlet pipe's pipe length of left U type outlet pipe 6 and right U type outlet pipe 7 to reduce low-frequency noise;By design resonance cavity 11 to specifically eliminate low-frequency noise;By design multiple baffle 8 and increase reinforcing plate 9 to strengthen the support of muffler shell 2, so that it is not easily excited by shock wave;By increasing sound-absorbing cotton 10 in multiple muffler cavities to improve the noise reduction amount of high-frequency noise and increase the damping of muffler shell 2, to optimize shock wave problem.

Description

Technical Field

[0001] This utility model relates to the field of vehicles, and more particularly to the field of exhaust systems, specifically a muffler system that simultaneously solves the problems of low-frequency noise and shock waves. Background Technology

[0002] With increasingly stringent domestic automotive noise regulations, the noise levels for exhaust systems are becoming more and more demanding. However, under the conditions of energy conservation, environmental protection, and lightweight design, exhaust systems still need to meet legal and regulatory requirements. The goal is to add muffler components within a limited space to meet noise requirements, while minimizing the cost and materials used in the muffler device.

[0003] Hybrid vehicles require a large battery pack to be installed in the chassis, which takes up a significant amount of chassis space. This reduces the space available for the exhaust system's muffler. Therefore, the central muffler in the exhaust system of hybrid vehicles is designed to be very small, or even eliminated altogether. This presents a significant challenge to the acoustic design of the exhaust system: due to the small size or elimination of the central muffler, the standing wave phenomenon in the exhaust system is more pronounced. This leads to increased low-frequency noise from the exhaust tailpipe, and even noise peaks at specific engine speeds.

[0004] Additionally, vehicles equipped with naturally aspirated engines can generate shock waves if their exhaust pipes are too long. The current solution is to add a muffler to the existing exhaust system to interrupt the standing waves generated by the excessively long exhaust pipe, thus eliminating the shock wave phenomenon. However, due to space constraints, in some cases it is not possible to add a muffler to the existing exhaust system, or the added muffler may be too small to effectively eliminate the shock wave. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a silencer system that is simple in structure, has good noise reduction effect, and is widely applicable, while solving the problems of low-frequency noise and shock waves.

[0006] To achieve the above objectives, the silencer system of this utility model simultaneously solves the problems of low-frequency noise and shock waves as follows:

[0007] The muffler system that simultaneously solves the problems of low-frequency noise and shock waves is characterized in that the system includes a muffler inlet pipe 1, a muffler housing 2, and a muffler outlet pipe 3. The muffler inlet pipe 1 is connected to the top of the muffler housing 2, and the muffler outlet pipe 3 is connected to the side of the muffler housing 2.

[0008] The muffler housing 2 includes four partitions 8 and a reinforcing plate 9 inside. The four partitions 8 are vertically installed inside the muffler housing 2, dividing the interior of the muffler housing 2 from right to left into a first cavity, a cavity to be divided, a fourth cavity, a fifth cavity, and a sixth cavity. The reinforcing plate 9 is horizontally installed in the cavity to be divided, dividing the cavity to be divided from top to bottom into a second cavity and a third cavity. The sixth cavity is a resonant cavity 11.

[0009] Preferably, the muffler housing 2 further includes an air inlet pipe 4 and a resonant cavity connecting pipe 5. The air inlet pipe 4 vertically penetrates the second cavity, with its inlet located above the second cavity and its outlet located in the third cavity. The resonant cavity connecting pipe 5 horizontally penetrates the fourth, fifth, and sixth cavities, with its inlet located in the third cavity and its outlet located in the sixth cavity.

[0010] Preferably, the muffler housing 2 further includes a left U-shaped exhaust pipe 6, which penetrates the fourth cavity, the fifth cavity, and the sixth cavity. The inlet of the left U-shaped exhaust pipe 6 is located in the fifth cavity, and the outlet of the left U-shaped exhaust pipe 6 is located on the side of the sixth cavity.

[0011] Preferably, the muffler housing 2 further includes a right U-shaped exhaust pipe 7, which penetrates the first cavity, the third cavity, the fourth cavity, the fifth cavity and the sixth cavity. The inlet of the right U-shaped exhaust pipe 7 is located in the fifth cavity, and the outlet of the right U-shaped exhaust pipe 7 is located on the side of the first cavity.

[0012] Preferably, the muffler housing 2 further includes sound-absorbing cotton 10, and the first cavity, the second cavity and the fourth cavity are filled with sound-absorbing cotton 10.

[0013] The silencer system of this invention simultaneously solves the problems of low-frequency noise and shock waves. It reduces low-frequency noise by extending the length of the silencer's exhaust pipe through the design of the left U-shaped exhaust pipe 6 and the right U-shaped exhaust pipe 7; it eliminates low-frequency noise by designing a resonant cavity 11; it strengthens the support of the silencer housing 2 by designing multiple baffles 8 and adding reinforcing plates 9, making it less susceptible to shock wave excitation; and it improves the high-frequency noise attenuation and increases the damping of the silencer housing 2 by adding sound-absorbing cotton 10 to multiple silencer cavities, thereby optimizing the shock wave problem. Attached Figure Description

[0014] Figure 1 This is an external schematic diagram of the silencer system of this utility model that simultaneously solves the problems of low-frequency noise and shock waves.

[0015] Figure 2This is a three-dimensional schematic diagram of the interior of the muffler housing of the muffler system that simultaneously solves the problems of low-frequency noise and shock waves, which is the purpose of this utility model.

[0016] Figure 3 This is a schematic diagram of the inside of the muffler housing of the muffler system that simultaneously solves the problems of low-frequency noise and shock waves, which is the purpose of this utility model.

[0017] Figure 4 This is a schematic diagram of the exhaust airflow direction of the muffler system that simultaneously solves the problems of low-frequency noise and shock waves according to this utility model.

[0018] Figure label:

[0019] 1. Muffler intake pipe

[0020] 2. Muffler housing

[0021] 3. Muffler exhaust pipe

[0022] 4. Intake pipe

[0023] 5. Resonant cavity connecting pipe

[0024] 6. Left U-shaped air outlet pipe

[0025] 7. Right U-shaped exhaust pipe

[0026] 8 partitions

[0027] 9 Reinforcing Plates

[0028] 10 Sound-absorbing cotton

[0029] 11 Resonant Cavity Detailed Implementation

[0030] To more clearly describe the technical content of this utility model, the following description is provided in conjunction with specific embodiments.

[0031] The muffler system of this utility model that simultaneously solves the problems of low-frequency noise and shock waves includes a muffler inlet pipe 1, a muffler housing 2, and a muffler outlet pipe 3. The muffler inlet pipe 1 is connected to the top of the muffler housing 2, and the muffler outlet pipe 3 is connected to the side of the muffler housing 2.

[0032] The muffler housing 2 includes four partitions 8 and a reinforcing plate 9 inside. The four partitions 8 are vertically installed inside the muffler housing 2, dividing the interior of the muffler housing 2 from right to left into a first cavity, a cavity to be divided, a fourth cavity, a fifth cavity, and a sixth cavity. The reinforcing plate 9 is horizontally installed in the cavity to be divided, dividing the cavity to be divided from top to bottom into a second cavity and a third cavity. The sixth cavity is a resonant cavity 11.

[0033] In a preferred embodiment of the present invention, the muffler housing 2 further includes an air inlet pipe 4 and a resonant cavity connecting pipe 5. The air inlet pipe 4 vertically penetrates the second cavity, with its inlet located above the second cavity and its outlet located in the third cavity. The resonant cavity connecting pipe 5 horizontally penetrates the fourth, fifth, and sixth cavities, with its inlet located in the third cavity and its outlet located in the sixth cavity.

[0034] In a preferred embodiment of the present invention, the muffler housing 2 further includes a left U-shaped exhaust pipe 6, which penetrates the fourth cavity, the fifth cavity and the sixth cavity. The inlet of the left U-shaped exhaust pipe 6 is located in the fifth cavity, and the outlet of the left U-shaped exhaust pipe 6 is located on the side of the sixth cavity.

[0035] In a preferred embodiment of the present invention, the muffler housing 2 further includes a right U-shaped exhaust pipe 7, which penetrates the first cavity, the third cavity, the fourth cavity, the fifth cavity and the sixth cavity. The inlet of the right U-shaped exhaust pipe 7 is located in the fifth cavity, and the outlet of the right U-shaped exhaust pipe 7 is located on the side of the first cavity.

[0036] In a preferred embodiment of the present invention, the muffler housing 2 further includes sound-absorbing cotton 10, and the first cavity, the second cavity and the fourth cavity are filled with sound-absorbing cotton 10.

[0037] In a specific embodiment of this utility model, a specific resonator and long tailpipe structure are designed in the muffler at the rear of the exhaust system to effectively reduce low-frequency noise.

[0038] Vehicles equipped with naturally aspirated engines may experience shock waves if their exhaust pipes are too long. A shock wave occurs when sound waves propagate forward through the exhaust pipe; due to the long pipe, the waveform gradually changes from a sine wave to an irregular triangular wave, with a steep abrupt change at the front. This abrupt change excites strong vibrations in the muffler housing, generating harsh radiated noise. This invention effectively solves the shock wave problem by strengthening the structure of the muffler and increasing the amount of sound-absorbing cotton filling to increase high-frequency noise reduction and suppress muffler housing vibration.

[0039] Existing mufflers require ample space, typically necessitating a large muffler positioned in the center of the chassis to achieve optimal noise reduction. However, in new energy vehicles, the battery pack occupies the space for the central muffler, resulting in a very small or even eliminated central muffler in the exhaust system of hybrid models. To address the resulting low-frequency acoustic and shock wave issues, a redesign of the rear exhaust system muffler is necessary. This invention employs a special resonant cavity added to the rear exhaust system muffler and cleverly extends the muffler's outlet pipe length to better eliminate low-frequency noise. Simultaneously, the shock wave problem is effectively addressed by reinforcing the muffler's structure and increasing the amount of sound-absorbing cotton filling.

[0040] This invention integrates various acoustic solutions into a single silencer, thereby simultaneously addressing low-frequency noise and shock wave issues.

[0041] This invention divides the entire muffler into up to six cavities by designing multiple partitions 8 and reinforcing plates 9. The advantages of this are: ① Multiple partitions and reinforcing plates increase the support of the muffler shell 2, making it less prone to shock wave problems; ② Multiple cavities play different silencing roles. Three cavities are filled with sound-absorbing cotton to eliminate high-frequency noise and improve shock wave problems, one cavity serves as a Helmholtz resonant cavity to eliminate low-frequency noise, and the other two cavities serve as exhaust airflow channels and expansion cavities to achieve a certain silencing effect.

[0042] By integrating different acoustic structures—multi-cavity sound-absorbing cotton, Helmholtz resonant cavity, expansion cavity, and U-shaped vent pipe—in a single silencer, the goal of simultaneously solving low-frequency noise and shock wave problems can be achieved.

[0043] This invention uses a resonant cavity scheme to solve the low-frequency problem, a U-tube scheme to reduce low-frequency noise, and proposes a solution to the shock wave problem.

[0044] For the specific implementation scheme of this embodiment, please refer to the relevant descriptions in the above embodiments, which will not be repeated here.

[0045] It is understood that the same or similar parts in the above embodiments can be referred to each other, and the contents not described in detail in some embodiments can be referred to the same or similar contents in other embodiments.

[0046] It should be noted that in the description of this utility model, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means at least two.

[0047] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0048] The silencer system of this invention simultaneously solves the problems of low-frequency noise and shock waves. It reduces low-frequency noise by extending the length of the silencer's exhaust pipe through the design of the left U-shaped exhaust pipe 6 and the right U-shaped exhaust pipe 7; it eliminates low-frequency noise by designing a resonant cavity 11; it strengthens the support of the silencer housing 2 by designing multiple baffles 8 and adding reinforcing plates 9, making it less susceptible to shock wave excitation; and it improves the high-frequency noise attenuation and increases the damping of the silencer housing 2 by adding sound-absorbing cotton 10 to multiple silencer cavities, thereby optimizing the shock wave problem.

[0049] In this specification, the present invention has been described with reference to specific embodiments thereof. However, it will be apparent that various modifications and variations can be made without departing from the spirit and scope of the present invention. Therefore, the specification and drawings should be considered illustrative rather than restrictive.

Claims

1. A silencer system that simultaneously solves the problems of low-frequency noise and shock waves, characterized in that, The system includes a muffler inlet pipe (1), a muffler housing (2), and a muffler outlet pipe (3). The muffler inlet pipe (1) is connected to the top of the muffler housing (2), and the muffler outlet pipe (3) is connected to the side of the muffler housing (2). The interior of the muffler housing (2) includes four partitions (8) and a reinforcing plate (9). The four partitions (8) are vertically installed inside the muffler housing (2), dividing the interior of the muffler housing (2) from right to left into a first cavity, a cavity to be divided, a fourth cavity, a fifth cavity, and a sixth cavity. The reinforcing plate (9) is horizontally installed in the cavity to be divided, dividing the cavity to be divided from top to bottom into a second cavity and a third cavity. The sixth cavity is a resonant cavity (11).

2. The silencer system for simultaneously solving low-frequency noise and shock wave problems according to claim 1, characterized in that, The muffler housing (2) also includes an air inlet pipe (4) and a resonant cavity connecting pipe (5). The air inlet pipe (4) vertically penetrates the second cavity, with its inlet located above the second cavity and its outlet located in the third cavity. The resonant cavity connecting pipe (5) horizontally penetrates the fourth, fifth, and sixth cavities, with its inlet located in the third cavity and its outlet located in the sixth cavity.

3. The silencer system that simultaneously solves low-frequency noise and shock wave problems according to claim 1, characterized in that, The muffler housing (2) also includes a left U-shaped exhaust pipe (6), which passes through the fourth cavity, the fifth cavity and the sixth cavity. The inlet of the left U-shaped exhaust pipe (6) is located in the fifth cavity, and the outlet of the left U-shaped exhaust pipe (6) is located on the side of the sixth cavity.

4. The silencer system for simultaneously solving low-frequency noise and shock wave problems according to claim 1, characterized in that, The muffler housing (2) also includes a right U-shaped exhaust pipe (7), which passes through the first cavity, the third cavity, the fourth cavity, the fifth cavity and the sixth cavity. The inlet of the right U-shaped exhaust pipe (7) is located in the fifth cavity, and the outlet of the right U-shaped exhaust pipe (7) is located on the side of the first cavity.

5. The silencer system for simultaneously solving low-frequency noise and shock wave problems according to claim 1, characterized in that, The muffler housing (2) further includes sound-absorbing cotton (10), and the first cavity, the second cavity and the fourth cavity are filled with sound-absorbing cotton (10).

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