CN106382432A - Helmholtz resonant silencing unit based on maze structure and resonant silencer - Google Patents

Abstract

The invention provides a helmholtz resonant silencing unit based on a maze structure and a resonant silencer, and relates to the field of noise control. The helmholtz resonant silencing unit based on the maze structure comprises a pipeline body, a connecting tube connected to the pipeline body, and a maze cavity which communicates with the connecting tube. A sound wave incident end of the maze cavity communicates with the connecting tube, and a resonant cavity with the structure can reduce phononic band gap height. Compared with a conventional helmholtz resonant cavity, the helmholtz resonant silencing unit provided by the invention can occupy small space volume to realize high-low-frequency-band noise elimination. The resonant silencer comprises the helmholtz resonant silencing unit based on the maze structure, and therefore, on the premise of occupying the same volume, noises of lower frequency can be eliminated. According to the helmholtz resonant silencing unit and the resonant silencer provided by the invention, material selection range is wide, preparation is simple, assembly is easy, and an application prospect is wide.

Description

Helmholtz resonance muffling unit based on labyrinth structure and resonance exhaust silencer

Technical field

The present invention relates to field of noise control, more particularly to a kind of helmholtz resonance based on labyrinth structure is eliminated the noise single Unit and resonance exhaust silencer.

Background technology

Tubing has a very wide range of applications background in fields such as ship, water conservancy, chemical industry, space flight and aviation.In pipeline Noise transmission and noise control be very important research contents.Generally we adopt the sound of Helmholtz resonator Learn resonance characteristics and eliminate noise.By arranging traditional helmholtz resonance cavity configuration parameter, when sound wave reaches resonant cavity, by In the change of intersection acoustic impedance, sound wave cannot continue to propagate, and under a certain frequency, sound wave will be completely reflected back, solve The larger problem of noise in pipeline.

Accompanying drawing 1 gives traditional Helmholtz resonator schematic plan view, common including pipeline body 1, Helmholtz Resonator structure 2 and connecting tube 3.Pipeline body 1 is communicated with connecting tube 3, connecting tube 3 and external helmholtz resonance chamber 2 phase Logical.Wherein, helmholtz resonance chamber 2 is rectangular enclosure.Theoretical, the resonance of Helmholtz resonator according to classical lumped parameter Frequency:

$f=\frac{c_0}{2\mathrm{\π}}\sqrt{\frac{S}{V(L+\mathrm{\δ})}}$

In formula：c₀For the velocity of sound；V is cavity volume；L is to connect length of tube；S is connecting tube cross-sectional area；δ is acoustic end Revise.The key dimension of helmholtz resonance cavity configuration has pipeline body diameter, connects pipe diameter, connects length of tube, and cavity Volume.If taking pipeline body L to be 0.3 meter, wide 0.02 meter, long 0.2 meter of helmholtz resonance cavity configuration 2, wide 0.236 meter, even Long 0.02 meter of adapter 3, wide 0.03 meter, as repetitives, via pipeline body, the cycle connects several in either direction Afterwards, simulate through simulation softward COMSOL Multiphysics, obtain helmholtz resonance chamber absorbance in accompanying drawing 2 with sound wave Variation diagram.As shown in Fig. 2 black triangle dotted line represents the variation diagram with frequency of sound wave for the reflectance, Lycoperdon polymorphum Vitt star point represents Penetrate the variation diagram with frequency of sound wave for the rate, absorbance less (reflectance is bigger) just illustrates the more of noise loss, and noise is disappeared The effect removed is better.In Fig. 2, in 100Hz～360Hz wide frequency range, traditional helmholtz resonance chamber operatively eliminates Noise.But the tubing characteristics of compact layout of each delicate fields, size Control is strict, and it is special that noise therein has low frequency again Levy, need the helmholtz resonance chamber of small size, but traditional Helmholtz resonator is difficult under the restriction of small size again Realize low frequency to eliminate the noise, thus noise is eliminated and proposes challenge.

Content of the invention

It is an object of the present invention to providing the helmholtz resonance muffling unit based on labyrinth structure and resonant silencing Device, in order to solve under small size, traditional Helmholtz resonator cannot meet the problem of pipeline low-frequency noise elimination.

Especially, the invention provides a kind of helmholtz resonance muffling unit based on labyrinth structure, disappear for noise Remove, including：Pipeline body；Connecting tube, the connecting tube being connected with described pipeline body；And labyrinth cavity, with described connecting tube It is connected, in order to produce resonance with the sound wave that transmits in described pipeline body incident direction, realize disappearing completely at some frequencies Effect except the sound wave in transmission direction corresponding with described incident direction.

Further, described labyrinth cavity is arranged by the way of thin straight pipeline equal length crawls and extends in parallel.

Further, the thin straight pipeline of described labyrinth cavity can be extended along arbitrary inceptive direction.

Further, the sound wave incident end of described labyrinth cavity is connected with described connecting tube.

Further, described labyrinth cavity is semi-closed structure.

Further, described pipeline body, described connecting tube and described labyrinth cavity use bounds material to prepare；

Alternatively, described pipeline body, described connecting tube and described labyrinth cavity use same bounds material system Standby.

Further, described bounds material refers to rigid boundary material, and incident acoustic wave is on described rigid boundary material side Normal direction acoustic pressure in boundary is zero.

Present invention also offers a kind of resonance exhaust silencer, eliminate the noise including the described helmholtz resonance based on labyrinth structure single Unit.

Further, described labyrinth cavity is with described pipeline body as main shaft, from starting with described connecting tube connectivity part is in Parallel spiral shape is wrapped in and ultimately forms helical pipe around described pipeline body.

Further, the axial pitch of described helical pipe is equal, and radial pitch is zero；

Alternatively, described pipeline body, described connecting tube and described helical pipe adopt common plasticses to prepare.

The helmholtz resonance muffling unit based on labyrinth structure of the present invention, due to the labyrinth using equal shape size After mesomerism chamber replaces traditional helmholtz resonance chamber, reduce the phonon forbidden band height in described tradition helmholtz resonance chamber (described phonon forbidden band highly correspondence abate the noise the size of frequency), therefore can use smaller volume described based on labyrinth structure Resonant cavity realize elimination to equal frequencies noise；Or with described resonant cavity equal volume in the case of, can eliminate More low-frequency noise, simultaneously described labyrinth structure crawl extension the number of turn more, the corresponding noise frequency reducing is also lower, can With effective suppression ultralow frequency noise.And then make the resonance with the described helmholtz resonance muffling unit based on labyrinth structure Acoustic filter, on the premise of identical possessive volume, can eliminate more low-frequency noise.Therefore, equally via pipeline body, By described Helmholtz's muffling unit based on labyrinth structure, the cycle connects after several in either direction, just can achieve under low frequency Wideband soundproof effect.Additionally, described labyrinth structure material selects extensively, to make simple, with low cost, it is easy to assemble, have It is widely applied prospect.

According to the detailed description to the specific embodiment of the invention below in conjunction with accompanying drawing, those skilled in the art will be brighter The above-mentioned and other purposes of the present invention, advantages and features.

Brief description

Describe the one of background technology and the present invention hereinafter with reference to the accompanying drawings by way of example, and not by way of limitation in detail A little specific embodiments.In accompanying drawing, identical reference denotes same or similar part or part.Those skilled in the art It should be understood that what these accompanying drawings were not necessarily drawn to scale.In accompanying drawing：

Fig. 1 is the schematic plan view in traditional helmholtz resonance chamber；

Fig. 2 be the absorbance in traditional helmholtz resonance chamber described in Fig. 1, reflectance with frequency of sound wave change schematic diagram；

Fig. 3 is the schematic plan in the helmholtz resonance chamber based on labyrinth structure according to an embodiment of the invention Figure；

Fig. 4 be the absorbance in the helmholtz resonance chamber described in Fig. 3 based on labyrinth structure, reflectance with frequency of sound wave change Change schematic diagram；

Fig. 5 is the schematic perspective view of resonance exhaust silencer in accordance with another embodiment of the present invention；

Fig. 6 be the absorbance in helmholtz resonance chamber of resonance exhaust silencer described in Fig. 5, reflectance with frequency of sound wave change Schematic diagram.

The each symbol of in figure is expressed as follows：

1st, pipeline body, 2, traditional helmholtz resonance cavity,

3rd, connecting tube, 4, labyrinth cavity,

5th, helical pipe,

6th, resonance exhaust silencer.

Specific embodiment

Fig. 3 is the schematic plan in the helmholtz resonance chamber based on labyrinth structure according to an embodiment of the invention Figure.As shown in figure 3, the invention provides a kind of helmholtz resonance muffling unit based on labyrinth structure, for duct noise Eliminate, for ease of the comparison of noise cancellation effect, employ in Fig. 3 with Fig. 1 tradition helmholtz resonance chamber identical pipeline originally Body 1 and connecting tube 3, be connected with connecting tube 3 is then labyrinth cavity 4, in order to upload with described pipeline body incident direction The sound wave coming produces resonance, realizes the sound wave being completely eliminated in transmission direction corresponding with described incident direction at some frequencies Effect.

Labyrinth cavity 4 is arranged by the way of thin straight pipeline equal length crawls and extends in parallel, can be along arbitrary inceptive direction Extended, the sound wave incident end of labyrinth cavity 4 is connected with connecting tube 3, formed semi-closed structure.The structure of labyrinth cavity 4 Form can reduce phonon forbidden band height (the highly corresponding frequency that abates the noise of described phonon forbidden band in traditional helmholtz resonance chamber Size), therefore can realize the elimination to more low frequency noise for the labyrinth cavity 4 of same space volume size, simultaneously Labyrinth structure crawl extension the number of turn more, corresponding reducible noise frequency also lower it might even be possible to effectively suppress intrasonic Noise.

In the present embodiment, long 0.2 meter of labyrinth cavity 4, wide 0.236 meter, by wide 0.02 meter of thin straight pipeline along arbitrary initial side Crawl to extend in parallel to equal length and form.The sound wave incident end of labyrinth cavity 4 is connected with connecting tube 3.Fig. 4 is base described in Fig. 3 In the helmholtz resonance chamber of labyrinth structure, via pipeline body 1, the cycle connects after several in either direction, and simulation obtains Absorbance, reflectance are with the change schematic diagram of frequency of sound wave.As shown in figure 4, black triangle dotted line represents reflectance with sound wave The variation diagram of frequency, Lycoperdon polymorphum Vitt star point represents the variation diagram with frequency of sound wave for the absorbance, and absorbance less (reflectance is bigger) is just Illustrate the more of noise loss, the effect that noise is eliminated is better.In Fig. 4, absorbance is in 48Hz～80Hz wide frequency range Reach almost ideal soundproof effect, compared with an equal amount of tradition helmholtz resonance chamber, greatly reduce to eliminate and make an uproar Acoustic frequency, shows that the Novel Helmholtz resonator of labyrinth structure can on the premise of maintaining resonant cavity identical occupancy volume Realize more low-frequency noise to eliminate；In other words on the premise of maintaining specific frequency of noise elimination constant, the present invention can reduce altogether Shake the space hold volume in chamber.

Described pipeline body 1, described connecting tube 3 and described labyrinth cavity 4 use bounds material to prepare.Described hard-edge Boundary's material refers to rigid boundary material, and normal direction acoustic pressure in the material boundary of described rigid boundary for the incident acoustic wave is zero.Alternatively, Described pipeline body 1, described connecting tube 3 and described labyrinth cavity 4 use same bounds material preparation.And this enforcement Bounds material in example is that rigid boundary material adopts ABS plastic, wide material sources, makes simple, with low cost, is easy to fill Join.

Fig. 5 is the resonance exhaust silencer 6 being processed according to one embodiment of the invention.As shown in figure 5, described resonant silencing Device 6 includes the helmholtz resonance muffling unit based on labyrinth structure.The described helmholtz resonance based on labyrinth structure is eliminated the noise Unit is identical with the helmholtz resonance muffling unit structure based on labyrinth structure in above-described embodiment.Tie for based on labyrinth The helmholtz resonance muffling unit structure division of structure, the present embodiment repeats no more.

Because described resonance exhaust silencer 6 includes the helmholtz resonance muffling unit based on labyrinth structure, and then make band The resonance exhaust silencer having the described helmholtz resonance muffling unit based on labyrinth structure on the premise of identical possessive volume, energy The more low-frequency noise of enough eliminations.Therefore, equally via pipeline body, the described Helmholtz based on labyrinth structure is being eliminated the noise Unit after the cycle connects several in either direction, just can achieve the wideband soundproof effect under low frequency.

In the present embodiment, described labyrinth cavity 4, with described pipeline body 1 as main shaft, the thin straight pipeline of labyrinth cavity 4 is taken out Go out, start to be wrapped in parallel spiral shape in either direction around described pipeline body 1 finally from connecting 3 places of leading to described connecting tube Form helical pipe 5.Keep the axial pitch of helical pipe 5 equal, be 0.025 meter, the number of turn is 7, and radial pitch is zero, thus Further reduce space hold volume.Fig. 6 is that via pipeline body 1, the cycle connects resonance exhaust silencer described in Fig. 5 in either direction After connecing several, simulate obtain absorbance, reflectance with frequency of sound wave change schematic diagram.As shown in fig. 6, black triangle Dotted line represents the variation diagram with frequency of sound wave for the reflectance, and Lycoperdon polymorphum Vitt star point represents the variation diagram with frequency of sound wave for the absorbance, transmission Rate less (reflectance is bigger) just illustrates the more of noise loss, and the effect that noise is eliminated is better.In Fig. 6, absorbance is same Sample reaches almost ideal noise cancellation effect in 48Hz～80Hz wide frequency range, with an equal amount of tradition Helmholtz altogether The chamber that shakes is compared, and greatly reduces while can eliminate noise frequency, and greatly reduces space hold volume, meets various essences The small size preparation of close instrument requires.Pipeline body 1, connecting tube 3 and helical pipe 5 adopt common plasticses to prepare simultaneously, example As still adopted ABS plastic to prepare, simple and convenient, greatly reduce production cost.

So far, although those skilled in the art will appreciate that detailed herein illustrate and describe the multiple of the present invention and show Example property embodiment, but, without departing from the spirit and scope of the present invention, still can be direct according to present disclosure Determine or derive other variations or modifications of many meeting the principle of the invention.Therefore, the scope of the present invention is it is understood that and recognize It is set to and cover other variations or modifications all these.

Claims (10)

1. a kind of helmholtz resonance muffling unit based on labyrinth structure, eliminates for noise, including：

Pipeline body；

Connecting tube, the connecting tube being connected with described pipeline body；And

Labyrinth cavity, is connected with described connecting tube, in order to produce altogether with the sound wave that transmits in described pipeline body incident direction Shake, realization is completely eliminated the effect of the sound wave in transmission direction corresponding with described incident direction at some frequencies.

2. the helmholtz resonance muffling unit based on labyrinth structure according to claim 1, described labyrinth cavity adopts The thin straight pipeline equal length mode extending in parallel of crawling is arranged.

3. the helmholtz resonance muffling unit based on labyrinth structure according to claim 2 is it is characterised in that described fan The thin straight pipeline of uterine cavity body can be extended along arbitrary inceptive direction.

4. the helmholtz resonance muffling unit based on labyrinth structure according to claim 1 is it is characterised in that described fan The sound wave incident end of uterine cavity body is connected with described connecting tube.

5. the helmholtz resonance muffling unit based on labyrinth structure according to claim 1 is it is characterised in that described fan Uterine cavity body is semi-closed structure.

6. the helmholtz resonance muffling unit based on labyrinth structure according to any one of claim 1-5, its feature It is, described pipeline body, described connecting tube and described labyrinth cavity use bounds material to prepare；

Alternatively, described pipeline body, described connecting tube and described labyrinth cavity use same bounds material preparation.

7. the helmholtz resonance muffling unit based on labyrinth structure according to claim 6 is it is characterised in that described hard Border material refers to rigid boundary material, and normal direction acoustic pressure in the material boundary of described rigid boundary for the incident acoustic wave is zero.

8. a kind of resonance exhaust silencer, disappears including the helmholtz resonance based on labyrinth structure any one of claim 1-7 Sound unit.

9. resonance exhaust silencer according to claim 8 is it is characterised in that described labyrinth cavity is based on described pipeline body Axle, ultimately forms serpentine pipe from starting to be wrapped in parallel spiral shape with described connecting tube connectivity part around described pipeline body Road.

10. resonance exhaust silencer according to claim 9 it is characterised in that：The axial pitch of described helical pipe is equal, footpath It is zero to pitch；

Alternatively, described pipeline body, described connecting tube and described helical pipe adopt common plasticses to prepare.