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Muffler duct

一种消声管、管道的技术，应用在消音装置、发声器械、进气消音器等方向，能够解决不能降低低频噪音等问题，达到抑制反共振现象、减小噪音、减少反共振现象的效果

Inactive Publication Date: 2008-01-02
TOYODA GOSEI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, according to this technique, only noise close to the resonance frequency F can be reduced, but low-frequency noise in a wider range cannot be reduced

Method used

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  • Muffler duct
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Examples

Experimental program
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Embodiment

[0039] Hereinafter, the muffler pipe of the present invention will be described with reference to the accompanying drawings.

[0040] (Example)

[0041] The muffler pipe of this embodiment is provided with the aforementioned (1) and (2). FIG. 1 schematically shows an axonometric view showing the muffler pipe of this embodiment. On the other hand, FIG. 2 is a cross-sectional view schematically illustrating an operation mode, in which the muffler pipe of this embodiment is radially cut parallel to the pipe body.

[0042]As shown in FIGS. 1 and 2 , the muffler pipe of this embodiment includes a pipe body 1 and a resonance box 2 . The pipe body 1 is substantially cylindrical. The inside and outside of the pipe body 1 are separated by a peripheral wall 10 . The resonance box 2 has a substantially rectangular box shape. The interior and exterior of the resonance box 2 are partitioned by a partition wall 20 .

[0043] The axial portion of the pipe body 1 is accommodated in the ...

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PUM

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Abstract

The present invention relates to a silencing tube which includes a tube main body and a resonant tank, wherein, the inner side of the tube main body and the inner side of the resonant tank are directly connected with each other without a tubular piece. A ventilating opening is formed at the position which is opposite to the connecting opening in the dividing wall of the resonant tank, the ventilating opening includes a through hole shaped ventilating opening, a ventilating piece which is provided with a labyrinth-shaped ventilating path and is used for covering the ventilating opening, and the ventilating opening is used for connecting the inner side of the tube main body and the inner side of the resonant tank with each other with a connecting opening.

Description

technical field [0001] The invention relates to a duct that can be used, for example, as an intake duct of an internal combustion engine. Background technique [0002] Silencers (silence ducts) are used as intake or exhaust ducts for internal combustion engines or air conditioning equipment. This muffler duct reduces propagating sound from a noise source such as an internal combustion engine or an air conditioner, or noise caused by its own intake pulsation. As a known silencing pipe (for example, see JP-A-5-163925), a silencing device (for example, a so-called "Hamme" made of a box-shaped resonance box and a cylindrical member (or connecting pipe) is used. Holtz resonator") is connected to the cylindrical pipe body. [0003] In this muffler duct, the muffler resonates with a predetermined frequency component of the noise, thereby lowering the sound pressure level at the resonance frequency F. The well-known resonance frequency F is represented by the following formula 1....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M35/12
CPCF02M35/1255F01N1/023F02M35/1238G10K11/172
Inventor 井户靖服部胜
Owner TOYODA GOSEI CO LTD
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