Impedance combined type silencer

A composite muffler and sound absorbing body technology, which is applied to mufflers, machines/engines, engine components, etc., can solve the problems of poor high-frequency noise muffling effect, inability to achieve muffling effect, and poor low-frequency muffling performance, etc. Achieve the effect of increasing sound absorption, good noise reduction effect, and increasing contact area

Inactive Publication Date: 2012-09-26
宜兴市川泽环境工程有限公司
View PDF5 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The resistive muffler uses the sound-absorbing effect of the sound-absorbing material or the sound-absorbing structure to attenuate the noise propagating along the pipeline with the distance, so as to achieve the purpose of muffler. This kind of muffler has a good muffler effect on high-frequency noise. But the low-frequency noise reduction performance is poor; and the resistance muffler, by means of the sudden expansion (or contraction) of the pipe section or the side-connected resonant cavity, makes the sound waves of certain frequencies propagating along the pipe reflect in the direction of the source at the sudden change. , so as to achieve the purpose of silencing, it is more suitable for eliminating low and intermediate frequency noise, but has a poor effect on silencing high frequency noise
Therefore, the use of resistive or resistive mufflers alone cannot achieve the ideal noise reduction effect, resulting in a certain amount of noise pollution to the environment.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Impedance combined type silencer
  • Impedance combined type silencer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0020] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0021] Such as figure 1 Shown: an impedance compound muffler, including a shell 1, the shell 1 is a cavity structure with a sound-absorbing layer 2 on the inner wall, and a small hole injection device 3 and a section are arranged in the lower chamber of the shell 1 The flow pressure reducing device 4, wherein the small hole injection device 3 is located in the middle of the casing 1 and forms a cavity with the casing 1, and the lower part of the cavity formed between the casing 1 and the small hole injection device 3 is provided with The outlet 14 and the small hole injection device 3 are also cavity structures, and the side wall of the cavity of the small hole injection device 3 is provided with an injection hole 12 with a diameter not greater than 1.5mm; the throttle and pressure reduction device 4 is located in the small hole A cavity is formed betw...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses an impedance combined type silencer comprising a shell (1), wherein the shell (1) is of a cavity structure with a sound absorption layer (2) on the inner wall; a cavity at the lower part of the shell (1) is internally provided with a small hole jetting device (3) and a throttle pressure reduction device (4); the small hole jetting device (3) is positioned in the middle of the shell (1) and one cavity is formed between the small hole jetting device (3) and shell (1); the throttle pressure reduction device (4) is positioned in the middle of the small hole jetting device (3) and one cavity is formed between the throttle pressure reduction device (4) and the small hole jetting device (3); the lower end of the throttle pressure reduction device (4) is provided with an air inlet (5) communicated with external; a cavity at the upper part of the shell (1) is internally provided with a tubular honeycomb type sound absorption body (6); the upper part of the sound absorption body (6) is provided with an air outlet (7); and the lower part of the sound absorption body (6) is provided with a pored shelf (8). The impedance combined type silencer is compact in structure and has an excellent silencing effect on low to high frequency noise, thus being suitable to popularization and use.

Description

technical field [0001] The invention relates to a muffler, in particular to an impedance composite muffler. Background technique [0002] The muffler is a component that prevents sound transmission and allows airflow to pass through. It is an important measure to eliminate aerodynamic noise. The muffler is generally installed on the airflow channel of aerodynamic equipment or a noise reduction device in the intake and exhaust systems. And it can block the propagation of sound waves and allow the passage of airflow, which is an effective tool for controlling noise. There are many single resistive mufflers or resistant mufflers on the market today. The resistive muffler uses the sound-absorbing effect of the sound-absorbing material or the sound-absorbing structure to attenuate the noise propagating along the pipeline with the distance, so as to achieve the purpose of muffler. This kind of muffler has a good muffler effect on high-frequency noise. But the low-frequency noise...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): F01N1/10
Inventor 吕翊凤
Owner 宜兴市川泽环境工程有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products