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Expanding cavity adjustable exhaust silencer

A technology for exhaust mufflers and expansion chambers, which is applied in the direction of exhaust devices, noise reduction devices, machines/engines, etc. It can solve the problems that the muffler cannot achieve low-frequency noise reduction, achieve internal structure stability, reduce the generation of regenerative noise, and The effect of the low frequency noise reduction effect

Inactive Publication Date: 2011-09-21
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the main problem with this device is that it cannot realize the low-frequency noise reduction that the muffler changes with the working conditions.

Method used

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  • Expanding cavity adjustable exhaust silencer
  • Expanding cavity adjustable exhaust silencer
  • Expanding cavity adjustable exhaust silencer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] figure 1 It is a structural schematic diagram of Embodiment 1 of the present invention, figure 2 for figure 1 Sectional view along A-A direction; image 3 for figure 1 Section view along B-B direction; as shown in the figure, the exhaust muffler with adjustable expansion chamber of the present invention includes an intake pipe 1, an expansion chamber 2 and an exhaust pipe 3, and the expansion chamber 2 includes a chamber wall 2c, a front end cover 2a and a rear The end cap 2b, the expansion cavity 2 is provided with a movable partition 4 transversely perpendicular to the cavity wall 2c, the movable partition 4 divides the expansion cavity 2 into a cavity I 21 and a cavity II 22, and the passage between the cavity I 21 and the cavity II 22 A plurality of resonance holes 5 are connected, and the resonance holes 5 of the present embodiment are arranged on the movable partition 4; the air outlet of the air intake pipe 1 and the air inlet of the exhaust pipe 3 are arrang...

Embodiment 2

[0028] Figure 4 It is a schematic structural diagram of Embodiment 2 of the present invention, Figure 5 for Figure 4 As shown in the sectional view along the direction C-C, the difference between this embodiment and the first embodiment is that the resonance hole 5 is arranged on the pipe section where the exhaust pipe 3 passes through the chamber II 22 .

[0029] Certainly, locking device 63 is not limited to nut, can also be the locking mechanisms such as elastic clasp or pin; Elastic preload device 6 is not limited to three, also can be one or more; Can realize invention Purpose.

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Abstract

The invention discloses an exhaust muffler with an adjustable expanding cavity. The exhaust muffler comprises an air inlet pipe, the expanding cavity and a vent-pipe; wherein the expanding cavity comprises a cavity wall, a front-end cover and a rear-end cover; a moving clapboard, which divides the expanding cavity into a cavity I and a cavity II, is arranged inside the expanding cavity; the cavity I is communicated with the cavity II by at least one resonant hole; an air outlet of the air inlet pipe and an air inlet of the vent-pipe are arranged inside the cavity I; the moving clapboard is provided with at least one elastic pretightening force device; the pretightening force direction of the elastic pretightening force device positively faces to the cavity I. The exhaust muffler can realize self-adjustment of cavity volume and thus has the dynamic muffling effect that the muffling frequency of the muffler increases along with the increase of engine rotational speed and the muffling frequency of the muffler reduces along with the reduction of engine rotational speed, thereby realizing the low-frequency dynamic muffling. The exhaust muffler has better low-frequency muffling effect, effectively eliminates the exhaust noise, also realizes the function of damping and reducing the exhaust pressure of the expanding cavity through the movement of the moving clapboard, and has simple and compact structure.

Description

technical field [0001] The invention relates to an exhaust muffler, in particular to an exhaust muffler with an adjustable expansion cavity. Background technique [0002] Environmental noise refers to the sound that interferes with the surrounding life generated in industrial production, building construction, transportation and social life. Environmental noise pollution refers to the phenomenon that the generated environmental noise exceeds the environmental noise emission standards stipulated by the state and interferes with the normal life, work and study of others. [0003] With the improvement of industrialization, the scope of noise hazards is expanding day by day. Traffic noise has become the most important noise source in the current urban environmental noise, while exhaust noise is the main noise source of automobiles and their engines. The use of mufflers is widely used to control exhaust noise. the most effective means of noise reduction. In the prior art, the m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N1/02F01N7/08F01N13/08
Inventor 邓兆祥赵海军杨杰王攀
Owner CHONGQING UNIV
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