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Muffler based on sound ray deflection theory

A muffler and sound ray technology, applied in the direction of mufflers, machines/engines, engine components, etc., can solve problems such as failure to play, noise and noise, etc., to achieve improved sound absorption coefficient, increase temperature gradient, and increase sound absorption volume effect

Active Publication Date: 2011-11-09
INST OF ACOUSTICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, during the day, the sound rays will be bent and refracted toward the "cold end" - the sky. Although there will be a "sound shadow area" at the same time, the upward refracted sound rays hardly touch the ground, and the earth acts as a "sound-absorbing structure". Can not be used, so we will feel the hustle and bustle of the surrounding environment during the day

Method used

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  • Muffler based on sound ray deflection theory
  • Muffler based on sound ray deflection theory
  • Muffler based on sound ray deflection theory

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] refer to Figure 4 , the muffler with a low-temperature refrigeration system based on the sound ray deflection theory made in this embodiment, utilizes an existing muffler, and fixes a layer of sound-absorbing material and a structural device 4 on the inner wall of the shell 1 of the muffler, and in this The outer wall of the shell 1 of the muffler is composed of a low-temperature refrigeration system 2 . A layer of 100mm thick ice layer 2' is coated on the outer wall of the shell 1 of the muffler as a low-temperature refrigeration system 2, and then a layer of composite sound-absorbing structure is laid on the inner wall of the shell 1 of the muffler, for example, a composite layer is used on the surface The sound-absorbing cotton tube bundle micro-slit perforated plate resonant sound-absorbing device, the thickness of the sound-absorbing material or the sound-absorbing structure device 4 is 1000 mm, which can be implemented by those skilled in the art. On the basis o...

Embodiment 2

[0081] refer to Figure 7 , the muffler with a low-temperature refrigeration system based on the deflection theory of sound rays produced in this embodiment is composed of a muffler shell 1, a low-temperature refrigeration system 2, a temperature control device 3, and a sound-absorbing material or a sound-absorbing structure device 4. In the muffler A low-temperature refrigeration system 2 is installed on the outer wall of the shell 1, and the refrigeration system adopts a compressor for refrigeration, wherein the refrigeration system is composed of a compressor 10, a condenser 11, an evaporator 12, and a liquid storage dryer 5. The temperature control device 3 is a temperature control device commonly used in this profession, that is, the temperature control device 3 is composed of an expansion valve 6, a capillary temperature bulb 7, and a refrigeration piping system. The evaporator is wound on the outer wall of the muffler pipe to absorb heat, and the quantitative control of...

Embodiment 3

[0084] refer to Figure 8 , the muffler with a low-temperature refrigeration system based on the deflection theory of sound rays produced in this embodiment is composed of a muffler shell 1, a low-temperature refrigeration system 2, a temperature control device 3, and a sound-absorbing material or a sound-absorbing structure device 4. In the muffler A low-temperature refrigeration system 2 is installed on the outer wall of the housing 1. The low-temperature refrigeration system in this embodiment adopts semiconductor refrigeration, wherein the semiconductor refrigeration system is composed of insulating ceramic sheets 13, metal conductors 14, N-type and P-type semiconductors 15, and a DC power supply 16. The temperature control device 3 can adopt conventional cooling fins, fans, or other methods to control heat dissipation. The semiconductor refrigeration patch is pasted on the outer wall of the muffler pipe, and the quantitative control of the temperature gradient is realized...

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Abstract

The invention relates to a muffler based on a sound ray deflection theory, which comprises a muffler shell, a low-temperature refrigerating system and a temperature controller. The inner wall of the muffler shell is coated with a sound-absorbing material or structure, and the low-temperature refrigerating system is installed on the outer wall of the muffler shell. A low-temperature refrigerating system pipeline covers at least 5% of the area of an airflow pipeline outer wall. In the invention, the low-temperature refrigerating system is installed on the muffler, a greater (1-2,000 DEG C) temperature gradient is generated corresponding to the high temperature in the airflow pipeline, the sound rays are bent and deflected towards a cool end which refers to the sound-absorbing material and structure at the inner wall of the airflow pipeline so as to reduce the passed sound wave components not contacted with the sound-absorbing material or structure of the muffler in a muffler pipeline, increase the efficient absorption of noises in the pipeline and reduce the radiated noise. The invention can be applied to the muffler design of an aviation turbofan engine nacelle and an air charging / discharging pipeline system, such as a helicopter shaft turbine noise-elimination duct, a gas turbine and the like, and other environmental conditions where are convenient to and allow to provide the low-temperature refrigerating system at the cool end.

Description

technical field [0001] The invention relates to a muffler, in particular to a muffler based on sound ray deflection theory. Background technique [0002] In recent decades, air transportation has brought great convenience to people, but at the same time it has also brought serious noise pollution around the airport. According to the survey, the noise of aircraft is mainly reflected in the time of take-off and landing, especially when taking off. most notably. Since the airport is generally not far from the city, and some of the air routes pass over the city, aviation noise has become an important part of urban noise and seriously affects people's normal life. Therefore, the noise of aircraft flight, especially take-off and landing, should be reduced to the greatest extent. The noise of the time has become an imminent and urgent problem to be solved. [0003] As we all know, aviation noise mainly comes from jet noise and fan noise of aeroengines. Therefore, researchers hav...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N1/00F01N1/10
Inventor 吕亚东刘栋汪强
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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