Exhaust silencer

Abstract

The invention discloses an exhaust silencer. The exhaust silencer comprises a cylindrical body; an air inlet pipe and an air outlet pipe are arranged at the two ends of the cylindrical body in an inserted mode; annular partition plates are arranged on the outer peripheral surfaces of the air inlet pipe and the air outlet pipe; the peripheries of the partition plates are attached to the inner wall of the cylindrical body; the areas between the partition plates and the adjacent end surfaces of the cylindrical body form absorption chambers, and the peripheral walls of the absorption chambers are of single-layer structures; vent holes are formed in the pipe sections, located in the absorption chambers, of the air inlet pipe and the air outlet pipe; silencing cotton is arranged between the inner wall of the absorption chamber and the air inlet pipe as well as between the inner wall of the absorption chamber and the air outlet pipe; and the area between the two partition plates forms a reaction chamber, and the peripheral wall of the reaction chamber is of a double-layer structure. According to the exhaust silencer, a gap and a certain expansion space are formed between the double-layer structure to allow the radiation noise to react, elimination of low and medium frequency noise is completed in the process, then through the absorption chamber where the air outlet pipe is located, the noise is eliminated again, the single-layer structure and the double-layer structure are combined, and therefore the medium, high and low-frequency noise can be eliminated, and meanwhile, use of materials can be reduced.

Description

technical field [0001] The invention belongs to the field of automobile exhaust, in particular to an exhaust muffler. Background technique [0002] With the increase of car ownership, the emission noise of automobile fuel exhaust gas has become a common source of noise in life. In order to reduce the exhaust emission noise, the exhaust muffler is widely used as the noise reduction device for the tail row of the automobile at present. It mainly uses the principle that the porous sound-absorbing material and the sound wave interfere when they are superimposed and cancel each other out, so as to achieve the effect of noise reduction. In the prior art, the mufflers used in automobiles are mostly resistive mufflers with a double-layer or single-layer structure; however, the surface radiation noise of a single-layer muffler is relatively large, and sound waves can easily penetrate inside or outside the car, affecting the experience of personnel. Moreover, if the material thicknes...

AI Technical Summary

Problems solved by technology

In the prior art, the mufflers used in automobiles are mostly resistive mufflers with a double-layer or single-layer structure; however, the surface radiation noise of a single-layer muffler is relatively large, and sound waves can easily penetrate into or outside the car, affecting the experience of personnel. Moreover, if the material thickness of the single-layer muffler cylinder is too thin, it is easy to cause resonance and generate other noises; in order to avoid this situation, some mufflers adopt a double-layer cylinder structure, which will increase the weight of the exhaust system and increase the cost.

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