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Automobile exhaust noise eliminating method

A vehicle exhaust and noise elimination technology, applied in the direction of mufflers, engine components, machines/engines, etc., can solve the problems of short service life of the muffler, limited scope of application, poor low-frequency noise effect, etc.

Inactive Publication Date: 2017-03-22
刘海峰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the resistive mufflers and resistive mufflers mainly used in the market can only deal with high-frequency or medium-low frequency noise alone, and the scope of application is not wide. In the gas with corrosive effect of 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

Method used

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Experimental program
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Effect test

Embodiment 1

[0019] Such as figure 1 and figure 2 As shown, the method for noise elimination of automobile exhaust of the present invention is realized by the following steps: it is composed of a resistive noise reduction process and a resistive noise reduction process, and the resistive noise reduction process includes a first-level noise reduction process, a second-level noise reduction process and a third-level noise reduction process. Noise reduction treatment, the resistant noise reduction process includes the fourth level of noise reduction treatment, the exhaust gas of the automobile enters into the two interconnected cores arranged inside the cylinder body 8 through the cylinder body, and the exhaust gas in the core body is sequentially subjected to the first level of noise reduction treatment, For the second-stage noise reduction treatment and the third-stage noise reduction treatment, glass wool is installed on the inner wall of the cylinder 8, and the exhaust gas is finally sub...

Embodiment 2

[0023] Such as figure 1 As shown, in this embodiment, on the basis of Embodiment 1, the branch pipe A1 is provided with inverted triangular diversion grooves on the parts of the first and second anechoic chambers, and the branch pipe B2 is located on the part of the third anechoic chamber. There is an inverted triangular diversion groove on the top. The set inverted triangular diversion groove can guide the sound wave passing through the ventilation hole 7 to quickly enter the next anechoic room, and can accelerate the sound attenuation effect in the process of layered sound insulation room processing.

[0024] Preferably, the first partition 4 , the second partition 5 and the third partition 6 are all elliptical. The greater the change in cross-section of the airflow, the faster the air pressure and airflow velocity will be reduced. Therefore, when the airflow enters the cylinder body 8 from the exhaust port, the closer the shape of the partition is to a circle, the larger t...

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Abstract

The invention discloses an automobile exhaust noise eliminating method. The automobile exhaust noise eliminating method is composed of a preventing type noise eliminating working procedure and a resisting type noise eliminating working procedure. The preventing type noise eliminating working procedure comprises first-stage noise eliminating treatment, second-stage noise eliminating treatment and third-stage noise eliminating treatment. The resisting type noise eliminating working procedure comprises fourth-stage noise eliminating treatment. Automobile exhaust enters two connected core bodies arranged in a cylinder through the cylinder. The automobile exhaust is sequentially subjected to the first-stage noise eliminating treatment, the second-stage noise eliminating treatment and the third-stage noise eliminating treatment in the core bodies. Glass wool is installed on the inner wall of the cylinder, and finally, the automobile exhaust is subjected to the fourth-stage noise eliminating treatment under the absorption action of the glass wool. The main airflow of noise in airflow is divided through multiple channels, the sub-airflow impacts mutually, the flowing speed of the airflow is reduced, multiple times of processes are carried out until the airflow flows out through an outlet of an exhaust pipe, and a good noise eliminating purpose is achieved.

Description

technical field [0001] The invention relates to the field of engine exhaust mufflers, in particular to a method for eliminating noise of automobile exhaust. Background technique [0002] Automobile exhaust noise is mainly composed of periodic exhaust noise, turbulence noise and air column resonance noise. For some single-cylinder engines, the resonance noise formed by the cylinder and the exhaust pipe is the main noise source. The noise excited by the periodic pressure generated by the periodic opening and closing of the exhaust valve of the engine is called periodic exhaust noise, which is also the most important component of exhaust noise. [0003] Installing a muffler on the exhaust port of the engine is a better measure to solve the noise. At present, 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 the gas with corrosive effect of s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N1/10
Inventor 刘海峰
Owner 刘海峰