Noise weakening processing method for exhaust gas emission pipe

A technology of exhaust emission and treatment method, which is applied in the direction of mufflers, exhaust devices, engine components, etc., can solve the problems of insignificant noise treatment effect, poor low-frequency noise effect, and large power loss of muffler, so as to reduce the residual air flow Possibility, reduce impact or corrosion, improve the effect of service life

Inactive Publication Date: 2015-08-19
CHENGDU LINGCHUAN SPECIAL IND
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the production and processing of general mufflers, the resistive mufflers and resistive mufflers mainly used in 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; and in the general single muffler filter The effect of the hole on the noise treatment is not obvious, which in turn affects the efficiency of the entire noise reduction process

Method used

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  • Noise weakening processing method for exhaust gas emission pipe
  • Noise weakening processing method for exhaust gas emission pipe

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Experimental program
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Embodiment 1

[0030] Such as figure 1 with figure 2 As shown, this embodiment includes the following steps:

[0031] (A) The exhausted air flow is passed into the ventilation pipe through the air inlet, and the pneumatic control valve can control the flow direction of the air flow according to the size of the air flow;

[0032] (B) When the air flow exceeds a certain limit, the pneumatic control valve is opened, and the air flow directly enters the space formed by the first partition plate and the muffler wall from the air inlet, and most of the air flow enters the second through the connecting pipe. The space between the two partitions and the baffle, and the remaining part of the airflow is silenced step by step by the through holes on the two partitions;

[0033] (C) The sound-absorbing protrusions silence the noise filtered through the through holes. When the airflow flows through the through-holes through the sound-absorbing protrusions, the volume of the airflow changes suddenly, a...

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Abstract

The invention discloses a noise weakening processing method for an exhaust gas emission pipe. On the basis of two stages of noise reduction processing inside a cylinder, when the flow of gas flowing into a gas inlet is small, noise generated by the flow of gas is small correspondingly, a pneumatic control valve is directly switched off, the gas is directly exhausted by a ventilation pipe through a gas outlet, the probability that gas remains inside a noise reduction cavity is decreased, and the service life of a silencer is prolonged.

Description

technical field [0001] The invention relates to a muffler, in particular to a method for reducing noise of an exhaust gas discharge 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N1/00F01N13/00
Inventor 张军叶维敏汪庭文何晓鸣杨军
Owner CHENGDU LINGCHUAN SPECIAL IND
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