CN1048248A

CN1048248A - Vibration-absorptive type muffler

Info

Publication number: CN1048248A
Application number: CN 90102339
Authority: CN
Inventors: 郑成仁
Original assignee: Individual
Current assignee: Individual
Priority date: 1990-04-21
Filing date: 1990-04-21
Publication date: 1991-01-02

Abstract

This (series) baffler can be used for the noise reduction of mining main fan, portable blower, air drill and motor car engine noise, in the course of the work, the part energy of noise is directly absorbed when wearing aluminium sheet by little, the zero part energy of noise makes elastic yarn (or spring sheet) produce vibration, then its vibration is absorbed.

This baffler has structurally adopted the warding off in week of micropunch aluminium sheet of hierarchy to serve as a contrast and the elastic wire group, places polyurethane baffle and waterproof glass cotton in the two-layer chamber respectively.

Description

Vibration-absorptive type muffler

This (series) baffler is mainly used in the noise reduction of pneumatic noises such as the main fan in mine, portable blower, air drill, also can be used for the noise reduction of motors such as automobile, its working principle is: the noise air-flow is absorbed part energy by the micropunch aluminium sheet time, another part energy of noise air-flow makes elastic wire (or spring sheet) produce vibration, and then absorbing the energy of its vibration with damping material, it is a kind of baffler that vibration combines with absorption.

If the speed of air-flow is V, the diameter of elastic wire is d, then the shedding frequence of vortex be n=0.21 (v)/(d)

The harmonic wave order i=(2Ln)/(a) of standing wave then

The overall with of baffler is L in the formula;

The velocity of sound of air in the a-baffler.

The structure of baffler is as scheming: ward off the micropunch aluminium sheet that lining adopts hierarchy baffler week, and first layer aluminium sheet 6 thick 1.5mm, the aperture is 0.1mm, punching rate 2.5%, the dark 3.5～5mm in chamber, the centre accompanies polyurethane baffle 5; Second layer aluminium sheet 4 thick 1.5mm, the aperture is 0.1mm, punching rate 2%, the dark 10～50mm in chamber places waterproof glass cotton 2 or other sound absorbing material in the chamber.Elastic wire 8 can adopt the acid-resistant stainless steel silk, and is uniform on width direction.Four groups of Fixation With Steel Wire also can directly be fixed on the shell 1 on steel wire sleeve 3.Each is organized the steel wire spacing and gets about 40mm.First group of steel wire 9 vertically strained, and the steel wire number is i+1; Second group of steel wire 10 laterally strained, and number is i+1; The 3rd group of steel wire 11 vertically strained, and number is i+2; The 4th group of steel wire 12 laterally strained; Number is i+2.As be used for the demanding place of noise reduction, can add several groups of steel wires as stated above.Baffler end cap 7 is used bolton.

The baffler of the pure absorption or band noise elimination awl of this (series) baffler and present usefulness, and seniority among brothers and sisters formula, the checkering baffler is compared, and following characteristics are arranged:

1, blast and wind flow are produced any influence hardly, resistance is little;

2, simple in structure, easy to manufacture;

3, under similarity condition, erasure effect is remarkable;

4, corrosion-resistant, can be used for that water is arranged, and the environment of greasy dirt, clean easy.

On April 15th, 1

Claims

This (series) baffler be will vibration with absorb a kind of baffler that combines, the part energy of noise is converted into the vibration of elastic wire, the energy with vibration is absorbed again, another part energy of noise is directly absorbed by the micropunch aluminium sheet.This baffler has structurally adopted this new structure of vibrating-wire (or vibrating reed).