CN205823381U - Combined type muffler - Google Patents

Abstract

This utility model belongs to noise reduction field, relate to a kind of Combined type muffler, body including acoustic filter, resonant chamber that body includes being sequentially communicated, reflection room, absorption chamber, the diminishing conical pipe of sectional area it is provided with in resonant chamber, it is sequentially provided with along bus in conical pipe and some opens foraminate dividing plate, the most adjacent not conllinear of the aperture on dividing plate；Being provided with spherical cavity in reflection room, spherical cavity inwall is densely covered with shaggy projection；Porous sound-absorbing material it is filled with in absorption chamber.Present patent application utilizes the organic associating in operating room of multiple difference in functionality, uses the means such as the resonance of acoustics, reflection, diffraction to eliminate noise, and simple in construction, volume is little, excellent noise reduction effect.

Description

Combined type muffler

Technical field

This utility model belongs to noise reduction field, relates to a kind of Combined type muffler.

Background technology

Along with the development of economic society, automobile more and more enters in the middle of the life of people, and along with people couple The raising of the attention rate of environment, people are more and more higher to the environmental requirement of automobile.Automobile engine height after discharging burning Can produce the huge sound during temperature gases at high pressure, noise, up to more than 100 decibels, is the main source of automobile noise, therefore has Necessity installs acoustic filter additional to reduce automobile engine sound pollution in automobile exhaust system.Automotive muffler presses principle and structure Reactive muffler, dissipative muffler and impedance composite muffler three types can be divided into.Reactive muffler is to pass through in inside The parts such as pipeline, the dividing plate composition various muffling unit such as expansion chambers, resonant chamber, there is reflection and interfere in sound wave, fall when propagating Low acoustic energy is to reach noise elimination purpose；Dissipative muffler is that the pipeline filling sucting sound material passed through in exhaust gas inside absorbs Acoustic energy is to reach noise elimination purpose；Impedance composite muffler is to be combined to reach to eliminate the noise by muffling unit and sound-absorbing material respectively Purpose.

But current silencing equipment, in order to realize noise reduction, multiple structure is set the most from outside to inside, sufficiently complex, lead Cause muffler volume relatively big, be unfavorable for laying of the automobile confined space, and the single noise that makes of the excessive noise reduction means of volume Reducing effect is bad.

Utility model content

The purpose of this utility model is to provide a kind of simple in construction, volume little and the Combined type muffling of excellent noise reduction effect Device.

For reaching above-mentioned purpose, basic technology scheme of the present utility model is to provide a kind of Combined type muffler, including disappearing The body of sound device, resonant chamber that body includes being sequentially communicated, reflection room, absorption chamber, it is provided with sectional area in resonant chamber and gradually contracts Little conical pipe, is sequentially provided with along bus in conical pipe and some opens foraminate dividing plate, and the most adjacent aperture on dividing plate is not Conllinear；Being provided with spherical cavity in reflection room, spherical cavity inwall is densely covered with shaggy projection；It is filled with porous in absorption chamber to inhale Sound material.

When using such scheme, resonant chamber that the body of acoustic filter includes being sequentially communicated, reflection room, absorption chamber, resonant chamber The principle utilizing resonance carries out noise reduction.Reflection room utilizes the principle of reflection or diffraction to make noise at substantial amounts of reflection or diffraction During be consumed, reach the purpose of noise reduction.Absorption chamber utilizes the porous absorbent material filled to be that noise is reached by absorption wherein Purpose to noise reduction.Being provided with the diminishing conical pipe of sectional area in resonant chamber, conical pipe is the passage of noise, in conical pipe It is sequentially provided with along bus and some opens foraminate dividing plate, the meeting shape of the aperture on the gap formed between dividing plate and dividing plate and dividing plate Become specific natural frequency wave band, a certain section in the noise that the air vibration in conical pipe produces and this natural frequency wave band phase Deng or close time can produce resonance so that the noise of this band frequency can enter formation between dividing plate and dividing plate by aperture Intracavity, and the noise of other frequencies will be blocked, and then at conical pipe roundtrip or finally eliminate with pipe friction.Two-by-two The adjacent not conllinear of the aperture on dividing plate so that the path of the noise transmission of the intracavity that dividing plate is formed with dividing plate is become by straight line Broken line, increases the difficulty of noise transmission, and the time adding propagation makes noise be easier in propagating way be absorbed and anti- Penetrate.Being provided with spherical cavity in reflection room, spherical cavity inwall is densely covered with shaggy projection, enters the noise in spherical cavity, meeting Interreflection or diffraction in the cavity of spherical structure, and occur with the shaggy projection gathered at spherical cavity inwall Friction, becomes the energy of noise into thermal energy consumption by friction and dissipates, thus reach the purpose of noise reduction.Porous it is filled with in absorption chamber Property sound-absorbing material, for the remaining noise left over is absorbed, after noise enters porous sound-absorbing material, can produce therewith Friction or diffuse-reflectance, and then absorbed.Three rooms are laterally to be sequentially communicated, simple in construction, do not have the overlap of longitudinal direction so that this Device volume is little, and each dividing the work all to noise generation absorption in each room, uses the handss such as the resonance of acoustics, reflection, diffuse-reflectance Noise is eliminated by section, noise reduction means variation, excellent noise reduction effect.

The preferred version 1 that the improvement of base case is obtained, gap and hole diameter between dividing plate and formed intrinsic Frequency band is gradually reduced along conical pipe bus so that the wave band of the natural frequency of conical pipe front end is maximum wave band, and then screening Going out most noise, then natural frequency section is gradually reduced so that resonant frequency section reduces the most gradually, and then progressive Shave the noise screening out major part wave band so that they are reflection repeatedly or friction and then quilt in the cavity of dividing plate and spacer member Consume.

The preferred version 2 that the improvement of base case is obtained, porous sound absorbing material is mineral wool, and the slag face that appears on the market is common, Low price, low cost, easily change.

Accompanying drawing explanation

Fig. 1 is the structural representation of this utility model many structures deafener embodiment.

Detailed description of the invention

Below by detailed description of the invention and reference, this utility model is described in further detail:

Reference in Figure of description includes: resonant chamber 1, reflection room 2, absorption chamber 3, conical pipe 4, dividing plate 5, aperture 6, spherical cavity 7, projection 8.

Embodiment is the most as shown in Figure 1: a kind of Combined type muffler, the resonant chamber 1 that from left to right includes being sequentially communicated, Reflection room 2, absorption chamber 3, be horizontally arranged with the diminishing conical pipe of sectional area 4 in resonant chamber 1, the sectional area of conical pipe 4 is big The entrance that one end is gas or noise, one end that conical pipe 4 sectional area is little connects with the spherical cavity 7 of reflection room 2.Conical pipe It is sequentially provided with some dividing plates 5 having aperture 6 along bus, the aperture 6 not conllinear on the most adjacent dividing plate 5 in 4；Dividing plate 5 Between gap and aperture 6 diameter and the natural frequency section that formed be gradually reduced along conical pipe 4 bus, be provided with ball in reflection room 2 Shape chamber 7, spherical cavity 7 inwall is densely covered with shaggy projection 8；The outlet of spherical cavity 7 connects with absorption chamber 3；Fill out in absorption chamber 3 It is filled with porous sound-absorbing material mineral wool.

Working method: noise conical pipe 4 from resonant chamber 1 hold greatly entrance, the noise of a certain component frequency wave band with The gap between dividing plate 5 and aperture 6 diameter in conical pipe 4 and the natural frequency section that formed defines resonance, this subband Noise be able between dividing plate current, other noise is blocked passing through.Along with natural frequency wave band is gradually reduced, quilt The noise wave band stopped is the most.Only sub-fraction enters spherical cavity 7, and in spherical cavity 7 roundtrip or with Wall-friction gradually eliminates.The noise finally entering absorption chamber is the faintest, after absorption chamber 3 is absorbed, it is achieved that The noise reduction purpose of whole device.

The room of three work in this device is laterally to be sequentially communicated, and simple in construction does not has the overlap of longitudinal direction so that this dress Put volume little, and each dividing the work all to noise generation absorption in each room, uses the means such as the resonance of acoustics, reflection, diffuse-reflectance Noise is eliminated, noise reduction means variation, excellent noise reduction effect.

Above-described is only embodiment of the present utility model, the known general knowledge such as concrete structure and/or characteristic in scheme Too much describe at this.It should be pointed out that, for a person skilled in the art, before without departing from this utility model structure Putting, it is also possible to make some deformation and improvement, these also should be considered as protection domain of the present utility model, and these are all without shadow Ring effect and practical applicability that this utility model is implemented.The protection domain that this application claims should be with in its claim Appearance is as the criterion, and the detailed description of the invention in description etc. records the content that may be used for explaining claim.

Claims (3)

1. Combined type muffler, including muffler body, it is characterised in that resonant chamber that described body includes being sequentially communicated, anti- Penetrate room, absorption chamber, in described resonant chamber, be provided with the diminishing conical pipe of sectional area, set successively along bus in described conical pipe Have and some open foraminate dividing plate, the aperture not conllinear on described adjacent dividing plate；Spherical cavity, institute it is provided with in described reflection room State spherical cavity inwall and be densely covered with shaggy projection；Porous sound-absorbing material it is filled with in described absorption chamber.

Combined type muffler the most according to claim 1, it is characterised in that the described gap between dividing plate and aperture are straight Footpath and the natural frequency section that formed are gradually reduced along conical pipe bus.

Combined type muffler the most according to claim 1, it is characterised in that described porous sound absorbing material is mineral wool.