Commercial vehicle air inlet system silencer

Abstract

The utility model provides a silencer for an air inlet system of a commercial vehicle, which comprises a main pipeline, an air inlet is arranged at one end of the main pipeline, an air outlet is arranged at the other end of the main pipeline, a plurality of silencing cavities are arranged on a pipe body of the main pipeline, and ventilation pipelines are arranged in the silencing cavities. The air inlet system has the advantages of being wide in silencing frequency band, high in noise reduction amplitude, flexible in arrangement and the like, and is suitable for various commercial vehicle air inlet systems needing designated broadband silencing.

Description

Technical Field

[0001] The utility model relates to a muffler, more specifically to a muffler for an air intake system of a commercial vehicle. Background Art

[0002] The air intake system of commercial vehicles is an important part of the engine of commercial vehicles. It is responsible for providing clean air to the engine to ensure the normal operation of the engine. The design and performance of the air intake system directly affect the power, economy and emission level of the engine. The system usually includes components such as air filters, intake pipes and intake manifolds. The air filter is used to filter the air entering the engine and remove impurities and particulate matter to protect the engine from wear and damage. The intake pipe is the channel that transports clean air from the filter to the engine combustion chamber. Its design needs to consider the smoothness of air flow and reduce resistance. The intake manifold distributes the air to each cylinder to ensure that each cylinder can get the right amount of air.

[0003] The performance of the commercial vehicle air intake system directly affects the engine's power, economy and emission performance. The commercial vehicle air intake system is an indispensable part of the commercial vehicle engine, and its performance and status have an important impact on the operation of the engine and the performance of the vehicle. Therefore, when using commercial vehicles, attention should be paid to the maintenance and care of the air intake system to ensure the safe, reliable and economical operation of the vehicle.

[0004] At present, the noise of the air intake system of commercial vehicles is one of the main noises of the whole vehicle and an important indicator of NVH control of the whole vehicle. In particular, the air intake of commercial vehicles is close to the cab, and the impact of noise on the interior of the vehicle cannot be ignored. At present, the noise reduction methods of the air intake system of domestic commercial vehicles are usually just adjustments based on the original air intake structure, which cannot achieve specified broadband noise reduction. Utility Model Content

[0005] In view of the problems existing in the prior art, the purpose of the utility model is to provide a commercial vehicle air intake system muffler, which has the characteristics of wide silencing frequency band, high noise reduction amplitude, flexible layout, etc., and is suitable for various commercial vehicle air intake systems that require specified broadband silencing.

[0006] In order to achieve the above purpose, the utility model is implemented through the following technical solutions:

[0007] A commercial vehicle air intake system muffler comprises a main pipe, one end of which is provided with an air inlet, the other end of which is provided with an air outlet, a pipe body of the main pipe is provided with a plurality of muffler cavities, and a ventilation pipe is provided in the muffler cavity.

[0008] Furthermore, the plurality of muffler chambers are sequentially arranged on the pipe body of the main pipe along the incident direction of the noise.

[0009] Furthermore, the port cavities of the air inlet and the air outlet are tapered.

[0010] Furthermore, the muffler cavity adopts a Helmholtz-like muffler.

[0011] Furthermore, the air inlet and the air outlet are both connected to external pipes, and raised ribs are provided on the external pipes.

[0012] Furthermore, the muffler chamber includes a first muffler chamber, a second muffler chamber and a third muffler chamber, and the first muffler chamber, the second muffler chamber and the third muffler chamber are respectively connected to the main pipe.

[0013] Furthermore, N ventilation pipelines are provided in the silencing chamber, where N>1.

[0014] Furthermore, the lengths of the ventilation pipelines in each muffler chamber are different.

[0015] Furthermore, the diameters of the ventilation pipes in each muffler chamber are different.

[0016] Furthermore, the main pipeline adopts a plastic pipeline.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] 1. The utility model sets a plurality of silencing cavities on the pipe body of the main pipe, and a ventilation pipe is set in the silencing cavity, so that after the incident wave of the noise reaches each silencing cavity successively, a part of it enters each cavity to promote the movement of the air in the silencing cavity, and the other part propagates along the main pipe, and the purpose of silencing is achieved through the change of the acoustic impedance at the junction of each pipe.

[0019] 2. The utility model is made of plastic and is light in weight; the shape of the silencing cavity is flexible and changeable, and the arrangement is convenient; it can achieve specific broadband silencing and has a high noise reduction amplitude.

[0020] 3. The utility model has the characteristics of wide silencing frequency band, high noise reduction amplitude, flexible layout, etc., and is suitable for various commercial vehicle intake systems that require specified wide-band silencing.

[0021] It can be seen that compared with the prior art, the utility model has substantial characteristics and progress, and the beneficial effects of its implementation are also obvious. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0023] Figure 1It is a structural schematic diagram of the utility model.

[0024] In the accompanying drawings, each reference numeral represents:

[0025] 1. The first muffler chamber, 2. The second muffler chamber, 3. The third muffler chamber, 4. The air inlet, 5. The air outlet, 6. The main pipeline, 7. The ventilation pipeline. DETAILED DESCRIPTION

[0026] The specific implementation of the present utility model is described below in conjunction with the accompanying drawings.

[0027] like Figure 1 A commercial vehicle air intake system muffler shown includes a main pipe 6, one end of which is provided with an air inlet 4, and the other end of which is provided with an air outlet 5. On the pipe body of the main pipe 6, a first muffler chamber 1, a second muffler chamber 2 and a third muffler chamber 3 are sequentially arranged along the incident direction of noise.

[0028] The first muffler chamber 1, the second muffler chamber 2 and the third muffler chamber 3 are all Helmholtz-like mufflers, and each muffler chamber can be provided with one or more ventilation pipes 7 of different sizes and lengths, and the ventilation pipes 7 can be flexibly adjusted according to different noise reduction frequencies. The cross-sectional area of ​​the Helmholtz-like muffler chamber connecting pipe is Sc, the length of the Helmholtz-like muffler chamber connecting pipe is Lc, the volume of the muffler is V, and the cross-sectional area of ​​the main pipe is Sm; when there is only one ventilation pipe in each muffler chamber, its muffler peak frequency is Its transmission loss is When the number of ventilation pipes 7 in a single silencing cavity is greater than one, the silencing peak frequency and transmission loss are calculated by simcenter 3D software; and the transmission loss requirements of the specified silencing frequency band are achieved by setting various parameters.

[0029] In a specific embodiment, the inner cavity of the port cross section of the air inlet 4 and the air outlet 5 adopts a conical structure. The air inlet 4 and the air outlet 5 are both connected to an external pipeline, and the external pipeline is provided with a raised rib.

[0030] In a specific implementation, under the premise of satisfying the volume of the muffler, the first muffler chamber 1, the second muffler chamber 2 and the third muffler chamber 3 can flexibly adjust the structural shapes according to the requirements of the layout space.

[0031] In addition, the components of the present invention can all be made of plastic.

[0032] When in use, after the incident wave reaches the three silencer cavities in succession, a part of the incident wave enters each cavity to push the air in the container to move, and the other part propagates along the main pipe, achieving the purpose of silencer through the change of acoustic impedance at the junction of each pipe.

[0033] The utility model is further described in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the utility model and are not used to limit the scope of the utility model. In addition, it should be understood that after reading the content taught by the utility model, those skilled in the art can make various changes or modifications to the utility model, and these equivalent forms also fall within the scope defined by this application.

Claims

1. A muffler for an air intake system of a commercial vehicle, characterized in that: The utility model comprises a main pipe, one end of which is provided with an air inlet, the other end of which is provided with an air outlet, a pipe body of the main pipe is provided with a plurality of silencing cavities, and a ventilation pipe is provided in the silencing cavities.

2. The commercial vehicle air intake system muffler according to claim 1, characterized in that: The multiple muffler chambers are sequentially arranged on the pipe body of the main pipe along the incident direction of the noise.

3. The commercial vehicle air intake system muffler according to claim 1, characterized in that: The port inner cavities of the air inlet and the air outlet are tapered.

4. The commercial vehicle air intake system muffler according to claim 1, characterized in that: The muffler cavity adopts a Helmholtz-like muffler.

5. The commercial vehicle air intake system muffler according to claim 1, characterized in that: The air inlet and the air outlet are both connected with external pipes, and the external pipes are provided with raised ribs.

6. The commercial vehicle intake system muffler according to claim 2, characterized in that: The muffler chamber comprises a first muffler chamber, a second muffler chamber and a third muffler chamber, and the first muffler chamber, the second muffler chamber and the third muffler chamber are respectively communicated with the main pipe.

7. The commercial vehicle air intake system muffler according to claim 1, characterized in that: The muffler cavity is provided with N ventilation pipelines, where N>1.

8. The commercial vehicle air intake system muffler according to claim 7, characterized in that: The lengths of the ventilation pipelines in each muffler cavity are different.

9. The commercial vehicle air intake system muffler according to claim 7, characterized in that: The diameters of the ventilation pipelines in each muffler cavity are different.

10. The commercial vehicle air intake system muffler according to claim 1, characterized in that: The main pipeline is a plastic pipeline.

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