CN200946523Y

CN200946523Y - Three-in-one composite silencer

Info

Publication number: CN200946523Y
Application number: CN 200620054413
Authority: CN
Inventors: 潘恒明; 苗清银
Original assignee: Shenzhen Verypower Machinery & Equipment Co Ltd
Current assignee: Shenzhen Verypower Machinery & Equipment Co Ltd
Priority date: 2006-01-25
Filing date: 2006-01-25
Publication date: 2007-09-12
Anticipated expiration: 2016-01-25

Abstract

The utility model discloses a three-in-one composite silencer, including an expansion chamber, an anechoic chamber and a centre perforated pipe arranged at the expansion chamber and the anechoic chamber; the centre perforated pipe is composed of an input pipe, a transition tube and an output pipe; three layers of microporous tubes are arranged in the expansion chamber. Thanks to the composite silencer adopts the technical proposals mentioned above, thus compared with the existing techniques, the utility model has the advantages in that as follows: the high, intermediate and low frequency noise of the exhaust airflow of generator group can be reduced by means of the three-in-one composite silencer; most of all, an anechoic capability in low frequency range is added in the utility model, so the composite silencer is provided with a multilayer function effect namely fastness, resistance and multilayer resonance noise elimination.

Description

A kind of three-in-one composite muffler

Technical field

The utility model relates to a kind of silencing apparatus, specifically is meant a kind of three-in-one composite muffler that is applied to generator set.

Background technique

Along with the development of society, people are more and more higher to environment requirement, and at present to be known as by international community be the key issue that influences the 21 century sustainable development to environmental problem, and noise pollution one of 21 century mankind environmental problem of primarily capturing especially.The intake and exhaust noise of internal combustion engine generator group is the strongest noise source of diesel engine, and wherein exhaust sound mainly comprises: that the pressure pulsation of waste gas in outlet pipe produces is low, the high-frequency vortex noise at mid-frequency noise and exhaust valve flow area place.Because blast air is high temperature, high pressure, high velocity air, this function that just requires silencing apparatus to have diffusion, reduction of speed, frequency conversion just can obtain tangible noise reduction.The exhaust silencer of at present existing generator set mainly contains following a few class: reactive muffler, dissipative muffler, impedance complex formula silencing apparatus etc.Noise reduction is arranged in middle and high frequency scope preferably dissipative muffler and reactive muffler can effectively be eliminated low-frequency noise.

Summary of the invention

In order to overcome above-mentioned defective, the utility model purpose provides a kind of high, medium and low audio-frequency noise that can reduce in the generator set exhaust airstream, has increased the acoustical absorptivity in low-frequency range especially; Be to have the three-in-one composite muffler that resistance, resistive, multilayer resonance qualitly are eliminated the noise.

In order to achieve the above object, the technological scheme that the utility model adopted is: a kind of three-in-one composite muffler, and it comprises expansion chamber, anechoic room, places the central hole pipe in expansion chamber and the anechoic room; The central hole pipe is by comprising that supplying tube, transition tube, output tube three parts constitute; Be furnished with three layers of microporous pipe in the expansion chamber.

In said structure, described supplying tube is positioned at expansion chamber, and output tube is positioned at anechoic room, and transition tube is between expansion chamber and anechoic room.

In said structure, described central hole pipe is processed by the hole steel plate.

In said structure, multi-layer microporous pipe is processed by the hole steel plate.

In said structure, described anechoic room top layer is processed by steel plate.

In said structure, described anechoic room internal layer is processed by the hole steel plate.

In said structure, in anechoic room, fill the rock wool material, the rock wool material is between anechoic room top layer and anechoic room internal layer.

In said structure, the diameter of section S1 of described supplying tube is less than the diameter of section S2 of expansion chamber.

In said structure, S2: S1=M.The span of M is between 10-18.

Owing to adopt after the technique scheme, with prior art mutually more as can be known: the three-in-one composite muffler of the present invention can reduce the high, medium and low audio-frequency noise in the generator set exhaust airstream, has increased the acoustical absorptivity in low-frequency range especially.The effect that promptly has the multilayer function that resistance, resistive, multilayer resonance qualitly eliminate the noise.

Description of drawings

Fig. 1 is the three-in-one composite muffler profile of a utility model schematic representation;

Fig. 2 is that schematic representation is looked on the left side of Fig. 1;

Fig. 3 is the three-in-one composite muffler structural principle of a utility model schematic representation;

Embodiment

Please refer to shown in Fig. 1,2,3, below in conjunction with example a kind of three-in-one composite muffler in the utility model is described, it comprises expansion chamber 1, anechoic room 2, places central hole pipe in expansion chamber 1 and the anechoic room 2; The central hole pipe comprises supplying tube 301, transition tube 302, output tube 303;

Expansion chamber 1 is made of multi-layer microporous pipe 11.Described supplying tube 301 is positioned at expansion chamber 1, and output tube 303 is positioned at anechoic room, and transition tube 302 is between expansion chamber 1 and anechoic room 2.The section area S1 of described supplying tube 301 is less than expansion chamber 1 section area S2.The top layer of described anechoic room 2 is processed by steel plate, and the internal layer of described anechoic room 2 is processed by the hole steel plate, is filled with rock wool material 4 between top layer and internal layer.

Its principle: noise-cancelling theory mainly is to realize reducing exhaust sound through reactive muffling, multistage resonant silencing, resistance noise reduction.Noise-cancelling theory specifically describes and to be: when the generator set blast air is flowed through supplying tube 301 when arriving expansion chamber 1, because the sectional area S1 of described supplying tube 301 is less than the sectional area S2 of expansion chamber 1, and S2: S1=M, the M span is between 10-18.Reflection and principle of interference according to sound wave, make waste gas be able to effective elimination in the low-frequency noise that the pulsation of outlet pipe internal pressure is produced, owing to be provided with multi-layer microporous pipe 11 etc. in expansion chamber, according to the resonant silencing principle, then every layer of microporous pipe all has a resonance sound-absorbing natural frequency in addition; When the natural frequency of extraneous frequency of sound wave and RESONANT CAVITY MUFFLER was identical, then each system produced resonance, this moment the magnitude of vibrations maximum, the gas motion speed in the small aperture is also maximum; Because friction and damping, then a large amount of acoustic energy are converted into heat energy, thereby reach the effect of noise elimination.The utility model comprises totally four layers of central hole pipes, and therefore the frequency of noise elimination in low-frequency range is wide, and sound deadening capacity is big, and this is that multistage resonant cavity is eliminated the noise.

When exhaust flow was flowed through anechoic room 1, the high-frequency noise in the exhaust flow was absorbed by porous material, and this is a resistance noise reduction; A part of residual low-frequency noise resonates by resistive section anechoic room 1 tube wall generation and is further absorbed simultaneously, and this is the resonant silencing second time.Rationally determine the length of two joint anechoic rooms for different noise bands, making last joint have maximum frequency of noise elimination just in time is passing through frequency and (can being calculated by following formula by frequency F: n=1 in the F=n*C/2L formula, 2,3 of back one joint ... C is the velocity of sound, and L is an expansion chamber length).

In sum, owing to adopt technique scheme, three-in-one composite muffler of the present invention can reduce the high, medium and low audio-frequency noise in the generator set exhaust airstream, has increased the acoustical absorptivity in low-frequency range especially.The effect that promptly has the multilayer function that resistance, resistive, multilayer resonance qualitly eliminate the noise.

The sound deadening capacity that facts have proved this silencing apparatus is between 25-30dB (A), and the noise elimination effect is fine.

Claims

1, a kind of three-in-one composite muffler is characterized in that, it comprises expansion chamber, anechoic room, places the central hole pipe in expansion chamber and the anechoic room; The central hole pipe is by comprising that supplying tube, transition tube, output tube three parts constitute; Be furnished with three layers of microporous pipe in the expansion chamber.

2, according to the described a kind of three-in-one composite muffler of claim 1, it is characterized in that: described supplying tube is positioned at expansion chamber, and output tube is positioned at anechoic room, and transition tube is between expansion chamber and anechoic room.

3, according to the described a kind of three-in-one composite muffler of claim 1, it is characterized in that: in anechoic room, fill the rock wool material.

4, according to the described a kind of three-in-one composite muffler of claim 1, it is characterized in that: described anechoic room is processed by steel plate.

5, according to the described a kind of three-in-one composite muffler of claim 1, it is characterized in that: the diameter of section S1 of described supplying tube is less than the diameter S2 of expansion chamber.

6, according to the described a kind of three-in-one composite muffler of claim 5, it is characterized in that: S2: S1=m, the scope of getting of m is between 10-18.