Vehicle silencer

Abstract

The invention discloses a vehicle silencer. A shell is included. The two axial ends of the shell are provided with an air inlet end and an air outlet end correspondingly. The shell comprises an uppershell and a lower shell combined with the upper shell. Each of the upper shell and the lower shell internally comprises an inner pipe through which airflow passes in a conduction manner and a plurality of resonant cavities divided by radiation ribs and surrounding the inner pipe. A gap is formed between the two inner pipes in the axial direction of the shell. The inner pipes communicate with the resonant cavities through the gap. The radial section area of the air inlet end and the air outlet end is smaller than the radial section area of the inner pipes. Through the arrangement, combination of an expansion cavity type silencing structure and a Helmholtz silencing structure is achieved, under the coordinative action of the combination of the two silencing structures, spread energy is rapidly attenuated, and accordingly silencing is achieved; silencing holes do not need to be arranged, the silencing performance is excellent, airflow noise can be obviously lowered, the silencing effect for 500 Hz low-frequency noise is particularly obvious, and a reliable technology solution is provided for enhancing the vehicle taking experience of passengers.

Description

technical field [0001] The invention relates to the technical field of auto parts, in particular to a vehicle muffler. Background technique [0002] With the rapid development of industry and the improvement of people's living standards, automobiles have become one of the indispensable means of transportation for people to travel and freight. Turbocharging is a technology that converts the residual energy in the exhaust of the engine into the effective power of the engine. This technology can not only improve the power performance of the engine, improve the fuel economy of the engine, but also reduce the harmful components in the exhaust gas emitted by the engine, and has the effects of energy saving and environmental protection. At the same time, this technology is an important means of engine power recovery in plateau areas, so that the engine can adapt to the operating requirements of different altitudes. Therefore, turbocharger technology has become the development tre...

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Problems solved by technology

[0005] However, in the process of realizing the embodiment of the present application, the inventors of the present application found that the above-mentioned technology has at least the following technical problems: the muffler in the prior art eliminates the sound through the sound-absorbing hole between the partitions and the inner hole of the main body , due to the unreasonable structure, when used in turbocharging systems, especially engine systems, the structure of holes has the problem of poor noise reduction and noise reduction effects, especially for low-frequency noise.

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