Noise reduction device of exhaust pipe

Abstract

The invention discloses a noise reduction device of an exhaust pipe. The noise reduction device of the exhaust pipe comprises a barrel. A noise reduction cavity is formed in the barrel. The two ends of the barrel are provided with an air inlet and an air outlet respectively. Two partition plates and two baffles are installed in the noise reduction cavity sequentially in the direction of the air outlet. A connection pipe penetrates through the upper portions of the two partition plates and penetrates through the lower portions of the two baffles. The lower portion of each partition plate is provided with a plurality of through holes. A plurality of air holes are formed in the upper portion of each baffle. A ventilation pipe is connected between the air outlet and the air inlet and penetrates through the partition plates and the baffles. A pneumatic control valve is arranged at the connecting position between the ventilation pipe and the air inlet. When the flow of air flowing in from the air inlet is small, noise generated by air flow correspondingly is low, the pneumatic control valve is closed directly, the air flow is directly exhausted from the ventilation pipe via the air outlet, the possibility of residual air flow in the noise reduction cavity is decreased, and the service life of the noise reduction device can be prolonged.

Description

technical field [0001] The invention relates to a muffler, in particular to a muffler for an exhaust pipe. Background technique [0002] Traffic noise is the pollution source with the strongest radiation and the widest influence in the urban environment. In the noise of motor vehicles, exhaust noise is one of the main noise sources. Its reduction is mainly through the installation of exhaust mufflers. After the muffler is installed, it will inevitably have a great impact on the engine; the power loss of the general muffler is 3% to 8%. Larger power loss is allowed when the muffler is larger; lower power loss is required for the muffler matching the low-power engine. [0003] The number of automobiles in our country is increasing, and people's requirements for automobiles are no longer just means of transportation, but also energy-saving, environmental protection, aesthetics and comfort. Traffic noise from motor vehicles is the main source of noise on urban roads, and noise...

AI Technical Summary

Problems solved by technology

However, in the production and processing of general mufflers, the resistive mufflers and resistive mufflers mainly used on the market can only deal with high-frequency or low-frequency noise separately, and the scope of application is not wide. In terms of: in high temperature, water vapor and gas that is corrosive to sound-absorbing materials, the service life of the muffler is short, and the effect on low-frequency noise is poor; the biggest disadvantage is that the power loss of the muffler is too large

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