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Dispersion type noise deadener

A kind of muffler, diffusion type technology, applied in the direction of muffler device, machine/engine, pumping device for elastic fluid, etc. lower problem

Inactive Publication Date: 2009-04-29
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantage of this kind of muffler is that the muffler frequency band is not wide enough, the muffler value is low, and the fluid resistance loss along the way is relatively large, and the aerodynamic performance is not ideal.

Method used

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Examples

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Embodiment Construction

[0017] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings: the present embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and processes are provided, but the protection scope of the present invention is not limited to the following implementations example.

[0018] like Figure 1-Figure 3 As shown, this embodiment includes: a sound-absorbing air cylinder 1 and a sound-absorbing cone 2 . The sound-absorbing air cylinder 1 is two opposite tetrahedron frustums, which are connected in series through end cover flanges; The big head of the sound-absorbing cone 2 is located in the sound-absorbing air cylinder 1 and is the largest section of the air-absorbing cone 1;

[0019] The sound-absorbing air cylinder 1 is a concentric, two opposite tetrahedron frustums.

[0020] The sound-absorbing cone 2 is two opposite pyramids, and its section is...

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PUM

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Abstract

The invention relates to a diffusion type silencer of noise control technical field, which comprises a sound absorption air duct and a sound absorption cone, wherein, the sound absorption air duct is hollow, and is two opposing tetrahedral frustums which are connected in series via end cove flange; the inside of the sound absorption air duct is provided with the sound absorption cone fixed by a support frame, the sound absorption cone is two opposing pyramids, the big end of the sound absorption cone is in the sound absorption air duct and at the maximum section place of the air duct, and the small end is at the air inlet or outlet plane of the sound absorption air duct. The silencer of the invention has simple structure, low cost, large silencing quantity, and less resistance loss.

Description

technical field [0001] The invention relates to a muffler in the technical field of fans, in particular to a diffuser muffler. Background technique [0002] The noise problem is one of the key projects of environmental protection in various countries in the world today. The use of mufflers for noise control is one of the important measures for noise control. A muffler is a device that allows airflow to pass through, blocks or reduces the passage of sound, mainly to reduce aerodynamic noise. A large number of aerodynamic equipment such as fans are used in the production process, and the operating noise is very high when in use, which seriously affects the hearing health of the staff and safe production. In order to reduce noise, improve work efficiency, and protect the health of staff, it is very necessary to equip the fan with a muffler. [0003] On the other hand, in engineering practice, it is often necessary to add a diffuser downstream of the fan exhaust port. For ex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/66F01N1/00
Inventor 朱幼君欧阳华杜朝辉竺晓程吴亚东
Owner SHANGHAI JIAO TONG UNIV
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