A semi-active exhaust muffler

An exhaust muffler, semi-active technology, applied in mufflers, engine components, machines/engines, etc., can solve the problems of complex structure and short service life of mufflers, and achieve the purpose of reducing maintenance frequency, avoiding low-frequency resonance and reducing impact. Effect

Inactive Publication Date: 2019-08-13
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a semi-active exhaust muffler, which can effectively solve the problems of the existing mufflers such as short service life and complex structure.

Method used

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  • A semi-active exhaust muffler
  • A semi-active exhaust muffler
  • A semi-active exhaust muffler

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Embodiment Construction

[0025] As mentioned in the background art section, the current exhaust muffler is not only bulky, but also weak in impact resistance and short in service life.

[0026] Based on the above research, the embodiment of the present invention provides a semi-active exhaust muffler. Compared with the traditional Helmholtz muffler, the muffler with this structure can effectively reduce the complexity of its structure. In addition, when noise enters the sound-absorbing component, it will have a force effect on the triangular-like unit cell in the sound-absorbing component, and the force effect will cause a small deformation of the triangular-like unit cell to adapt to the noise and achieve the premise of sound absorption In this way, the impact on the sound-absorbing components is reduced, thereby reducing the maintenance frequency of the muffler and increasing the service life.

[0027] In order to make the above objects, features and advantages of the present invention more comprehe...

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Abstract

The invention discloses a semi-active exhaust silencer which comprises a shell, an air inlet pipe, an internal insertion pipe and an exhaust pipe. The air inlet end on the shell is provided with a front end cover, the air outlet end on the shell is provided with a back end cover, a first separating plate and a second separating plate are arranged in the shell, a plurality of through holes are formed in the second separating plate, a first cavity is formed by the first separating plate, the front end cover and the inner side wall of the front section of the shell, a second cavity is formed by the second separating plate, the first separating plate and the inner side wall of the middle section of the shell, and a third cavity is formed by the back end cover, the second separating plate and the inner side wall of the back section of the shell; the first cavity and the third cavity are each provided with a sound absorption component, and unit cells of the sound absorption components are similar-triangle unit cells; and the side walls of the air inlet pipe and the internal insertion pipe are each provided with interference holes. Compared with a traditional Helmholtz silencer, the silencer of the structure can effectively reduce the structure complexity; and in addition, through the sound absorption components of the above structure, on the premise that sound absorption is achieved, airflow impact can be reduced, the maintaining frequency of the silencer is further decreased, and the using period is prolonged.

Description

technical field [0001] The invention relates to the technical field of mufflers, in particular to a semi-active exhaust muffler. Background technique [0002] The muffler can be divided into passive muffler, active muffler and semi-active muffler according to its muffler principle. The passive muffler mainly relies on its structure to reflect sound energy or the sound-absorbing material to absorb sound energy; the active muffler uses an electronic control system to generate an infrasonic wave that is equal in amplitude to the sound wave of the sound source but opposite in phase, and achieves the muffler effect through sound wave interference; semi-active muffler Built-in passive control device, when the air flow changes, the noise reduction effect of the muffler will be adjusted through the air flow, so the energy generated by the noise can be used to activate the adjustment device without setting an additional power source. [0003] Among them, passive mufflers are divided...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N1/08
CPCF01N1/082F01N1/083F01N1/089
Inventor 马芳武梁鸿宇蒲永锋陈实现
Owner JILIN UNIV
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