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Silencer for fuel cell car air auxiliary system

An air-assisted, fuel cell technology, used in fuel cell additives, components of pumping devices for elastic fluids, liquid fuel engines, etc., can solve problems such as inability to eliminate broadband noise, and achieve good adaptability and variable The effect of many, beautiful and compact space

Inactive Publication Date: 2013-08-21
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the measures to solve this kind of problem mainly include the arrangement of expansion muffler, Helmholtz muffler and several 1 / 4 wavelength tubes, but because they can only eliminate the noise of a single frequency band, they cannot eliminate broadband noise, and are limited by the installation location , it is impossible to achieve a compact structure while satisfying the acoustic performance

Method used

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  • Silencer for fuel cell car air auxiliary system
  • Silencer for fuel cell car air auxiliary system
  • Silencer for fuel cell car air auxiliary system

Examples

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Embodiment

[0024] A muffler for an air assist system of a fuel cell vehicle, the structure of which is as follows Figure 1-2 As shown, it can be installed after the air filter or at the front end of the air filter. The muffler is composed of the air flow main pipe 8 and a number of annular resonant cavities set on the air flow main pipe 8. The partition board 7 is separated, and an opening 6 is provided on the air flow main pipe 8 , and the annular resonant cavity communicates with the air flow main pipe 8 through the opening 6 .

[0025] The airflow main pipe 1 communicates with each annular resonant cavity through at least two groups of openings, and the number of openings in each group matches the size of the annular resonant cavity and the frequency of the attenuated noise. There are four groups of openings in this embodiment. In addition, there are at least two ring resonant cavities, and the sizes of the ring resonant cavities are the same or different. In this embodiment, a firs...

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Abstract

The invention relates to a silencer for a fuel cell car air auxiliary system. The silencer for the fuel cell car air auxiliary system is composed of an airflow main pipe and a plurality of annular resonant cavities, wherein the annular resonant cavities are sleeved on the airflow main pipe and separated through annular separating plates. Open holes are formed in the airflow main pipe, and the annular resonant cavities are communicated with the airflow main pipe through the open holes. Compared with the prior art, by adjusting the widths, the inner diameters and the number of the annular resonant cavities and adjusting the diameters and the number of the open holes, the silencer can achieve the purpose of broadband and single frequency silencing. By adopting the structure, through different combination forms, broadband silencing effect or single frequency and broadband combining silencing effect can be achieved. The silencer for the fuel cell car air auxiliary system is compact in structure, capable of achieving good silencing effect in limited installation space, small in flow loss, resistant to high temperature and corrosion, and good in dustproof and waterproof effect.

Description

technical field [0001] The invention relates to the field of industrial noise reduction, including a muffler, in particular to a muffler for an air auxiliary system of a fuel cell vehicle. Background technique [0002] Fuel cell vehicles are new environmentally friendly vehicles with zero emissions. Although the noise source of the internal combustion engine is omitted, the new noise sources composed of fuel cell air auxiliary systems and motors will generate vibration noise during operation. The air assist system will produce howling sound especially when the air intake volume is large, and it is the main noise source of the fuel cell vehicle's external noise. [0003] Generally, when the fan speed of a fuel cell vehicle changes between 1400rpm and 3800rpm, there is a wide-band noise of 980Hz to 2600Hz, and the noise peak value increases with the increase of the fan speed. At the same time, there are some peaks that do not change with the fan speed in the low frequency ban...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/66H01M8/04
CPCY02E60/50
Inventor 郭荣朱伟伟章桐
Owner TONGJI UNIV
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