CN101315768A - Sponge plastics perforation and sound absorption board and method for producing the same - Google Patents
Sponge plastics perforation and sound absorption board and method for producing the same Download PDFInfo
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- CN101315768A CN101315768A CNA200810115676XA CN200810115676A CN101315768A CN 101315768 A CN101315768 A CN 101315768A CN A200810115676X A CNA200810115676X A CN A200810115676XA CN 200810115676 A CN200810115676 A CN 200810115676A CN 101315768 A CN101315768 A CN 101315768A
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Abstract
The invention relates to a perforated acoustical board made of foam plastic, which is characterized by comprising a foam plastic board opened with a plurality of through holes, the way in which the through holes are arranged on the foam plastic board is not limited, each through hole is internally embedded with a rigid pipe casting, the punch rate is 1 to 5 percent. Nozzles at two ends of the pipe casting are communicated with the atmosphere; the pipe wall is opened with a plurality of apertures which are communicated with an internal cavity of the pipe casting and keep a distance with nozzles at the two ends of the pipe casting. The method for manufacturing the perforated acoustical board of the invention comprises the following steps: (1) panels made of foam plastic provided with pores and the rigid pipe casting made of metal or rigid plastic (from which a material is selected from) are made; (2) the processing inside diameter of the rigid pipe casting is not bigger than 1mm, the pipe wall is opened with a plurality of apertures which are communicated with the internal cavity of the pipe casting and keep a distance with the nozzles; (3) the foam plastic board is opened with a plurality of through holes; (4) the rigid pipe casting is compactly assembled and arranged into the through holes; and (5) the surface is polished to be smooth.
Description
Technical field
The present invention relates to a kind of acoustic absorbant and preparation method thereof, particularly about a kind of sponge plastics perforation and sound absorption board and preparation method thereof.
Background technology
The process that the acoustic energy of sound wave by medium or when inciding on the medium interphase reduces is called sound absorption or sound absorption.Any material or structure because its poriness, membrane action or resonant structure more or less all have acoustical absorptivity to incident acoustic energy, have the material (usually, average sound absorption coefficient surpasses 0.2 material) of big acoustical absorptivity, are called acoustic absorbant.Sound absorption being arranged on the engineering and the acoustic absorbant of using value is arranged, mainly is porous sound-absorbing material.
The structural attitude of porous sound-absorbing material is: material has a large amount of holes that interpenetrates from showing the lining; Its sound absorbing mechanism is: after sound wave incides material surface, part sound wave reflects from porous material surface, another part acoustic wave transmission enters porosint, enter this part sound wave of porosint, cause the air vibration of porous sound-absorbing material inside, because the friction in air and hole and viscosity resistance etc. in the porous material, a part of acoustic energy is converted into heat energy, sound wave is decayed through repeatedly reflection is further in porous sound-absorbing material in addition, when the sound wave in entering porous material returns again, acoustic wave energy has been decayed a lot, the energy of remaining fraction only, major part is then sponged by the porous sound-absorbing material loss, and foam is one of common porous sound-absorbing material.The main medium-high frequency sound that absorbs of porous sound-absorbing material itself, relatively poor to the all-bottom sound absorption, usually be in conjunction with the sound absorption structure design, utilize the resonance sound-absorbing principle to solve the absorption problem of medium and low frequency sound.
Typical single resonance sound-absorbing device model is a Helmholtz resonator, as shown in Figure 1, its sound absorption principle is: air is that the little opening 11 of D enters from a diameter, after being the pore-throat 12 of L by a segment length, enter into the big container cavity 13 that a volume is V, air is in this process of circulation, with pore-throat 12 internal faces vibration friction, because the effect of viscous damping and heat conduction can make the acoustic energy loss, its acoustics effect is an acoustic resistance.Evidence, the resonator acoustical absorption coefficient changes with frequency, when incident sound wave frequency during near the natural frequency of resonator, air column in the pore-throat 12 produces judder, in vibration processes, owing to overcome frictional resistance and sound energy consumption, the highest acoustical absorption coefficient appears at the resonant frequency place; Otherwise when incident acoustic wave frequency during away from the resonator natural frequency, the resonator vibration is very weak, so sound absorption is very little.Resonant frequency is directly proportional with the diameter D (also can dissolve and be sectional area) of the little opening 11 of resonator, is inversely proportional to the long L of pore-throat 12 and the volume V of big cavity 13.
This shows, in the resonance sound-absorbing device, make up a little perforate, the pore-throat of hole by certain-length and the structure that a cavity with certain volume links to each other are the keys of resonance sound-absorbing device.Utilize the perforation sound absorber of the sound absorption principle composite design of above-mentioned resonance sound-absorbing device, modal application is a perforated plate.There is research to point out effective combination of foamed material and perforation structure, can improve its sound absorbing capabilities, for example, the percentage of perforation of polyfoam base material is about at 3% o'clock, acoustically effective is the highest to be appeared in 800～3200Hz frequency range, can effectively improve the sound absorption frequency characteristic of foam section.
Summary of the invention
At the problems referred to above, the objective of the invention is to propose a kind of sponge plastics perforation and sound absorption board that can effectively improve the medium and low frequency sound absorbing capabilities.
For achieving the above object, the present invention takes following technical scheme: a kind of sponge plastics perforation acoustic board, it is characterized in that: it comprises a plastic foamboard, offer some through holes on the described plastic foamboard, a rigid pipe fitting is installed in each described through hole, the two ends mouth of pipe of described rigid pipe fitting communicates with atmosphere, offers some apertures on the tube wall of described rigid pipe fitting, and described aperture communicates with the inner chamber of described rigid pipe fitting.
The percentage of open area that the described plastic foamboard of described rigid pipe fitting is installed is 1%～5%.
The arrangement of described through hole on described plastic foamboard is one of square or rounded projections arranged mode.
The bore of described rigid pipe fitting is not more than 1mm.
The described aperture of offering on the described rigid pipe fitting tube wall leaves certain distance apart from the two ends mouth of pipe of described rigid pipe fitting.
A kind of method for preparing sponge plastics perforation acoustic board as claimed in claim 1, it is characterized in that: it may further comprise the steps,
(1) material is selected: described plastic foamboard is chosen as the flat board that one of polyurethane, phenolic aldehyde, polyimide, polystyrene, Polyvinylchloride, urea aldehyde or polyoxyethylene material are made, and described rigid pipe fitting is chosen as the pipe fitting that one of metal or hard plastics are made;
(2) processing of described rigid pipe fitting: the internal diameter of described rigid pipe fitting is processed as and is not more than 1mm, offers the aperture of some and described rigid pipe fitting intracavity inter-connection on the tube wall of described rigid pipe fitting, and described aperture leaves certain distance apart from the mouth of pipe;
(3) processing of described plastic foamboard: described Foam Plastic Surface processing is smooth, offers some through holes on it;
(4) assembling: described rigid pipe fitting closely cooperated to be installed in the described through hole on the described plastic foamboard, and two mouths of pipe of described rigid pipe fitting communicate with the external world; The percentage of open area that the described plastic foamboard of described rigid pipe fitting is installed is 1%～5%;
(5) finishing: the polishing surface, make surfacing, two mouths of pipe of clearing up described rigid pipe fitting make it communicate with the external world.
Wherein, the described rigid pipe fitting method that is installed in the through hole on the described plastic foamboard that closely cooperates has two kinds: one, if the bore size of described through hole is more smaller than the external diameter of described rigid pipe fitting, described through hole and described rigid pipe fitting closely are equipped with; Two, if the bore size of described through hole is more bigger than the external diameter of described rigid pipe fitting, be inserted in the described through hole behind the distance coating adhesive between the aperture on the described rigid pipe fitting tube wall and the mouth of pipe of described rigid pipe fitting.
The present invention is owing to take above technical scheme, it has the following advantages: 1, the present invention bores a hole on polyfoam pipe fitting is set, both kept the good advantage of sound-absorbing porous material high frequency sound absorbing capabilities, utilized resonance sound-absorbing structure again, the sound absorbing capabilities of medium and low frequency is improved a lot.2, the rigid pipe fitting that is provided with among the present invention also plays withstand voltage supporting role, can form effective pressure-resistance structure with other rigid body etc. like this, makes it that good bearing capacity be arranged when reality is used.3, the through hole of being offered on the plastic foamboard of the present invention is arranged unrestrictedly, greatly facilitates processing.4, the hole shape of being offered on the rigid pipe fitting tube wall of the present invention and arrange unrestrictedly also greatly facilitates processing.5, the material washability of plastic foamboard and rigid pipe fitting is strong, so the present invention has using value very widely.
Description of drawings
Fig. 1 is a helmholtz resonance sound absorber structural representation
Fig. 2 is a structural representation of the present invention
Fig. 3 is the synoptic diagram in the square arrangement hole offered on the plastic foamboard of the present invention
Fig. 4 is the synoptic diagram in the rounded projections arranged hole offered on the plastic foamboard of the present invention
Fig. 5 is a synoptic diagram of offering circular port on the rigid pipe fitting tube wall of the present invention
Fig. 6 is a synoptic diagram of offering long and narrow hole on the rigid pipe fitting tube wall of the present invention
Fig. 7 is the synoptic diagram that the present invention is used in combination with other plane materiel
Fig. 8 is a resonance sound-absorbing device principle application synoptic diagram in the present invention
Fig. 9 is the present invention and regular-type foam plastic plate sound absorption characteristics comparison diagram
Embodiment
The present invention will be described in detail below in conjunction with drawings and Examples.
As shown in Figure 2, the present invention includes a plastic foamboard 1, on plastic foamboard 1, be equipped with many through holes 2.Rigid pipe fitting 3 of setting-in all in each through hole 2, the mouth of pipe 31 at rigid pipe fitting 3 two ends all communicates with the external world; Offer some apertures 32 on the tube wall of rigid accessory 3, aperture 32 communicates with the inner chamber of rigid pipe fitting 3.
The material composition of plastic foamboard 1 is polyurethane, phenolic aldehyde, polyimide, polystyrene, Polyvinylchloride, urea aldehyde or polyoxyethylene among the present invention; Plastic foamboard 1 itself has a large amount of holes, and porosity is generally about 95%.
The arrangement of through hole 2 on plastic foamboard 1 can be irregular alignment among the present invention, also can be regularly arranged, is square arrangement (as shown in Figure 3) such as through hole 2, is triangularly arranged (as shown in Figure 4) such as through hole 2 again.
As Fig. 5, shown in Figure 6, the inside diameter D 1 of rigid pipe fitting 3 is thinner among the present invention, generally is not more than 1mm.Some apertures 32 of offering on the tube wall of rigid pipe fitting 3 concentrate on the middle part of rigid pipe fitting 3, topmost and aperture bottom 32 leave certain distance L 1 respectively and between the upper end mouth of pipe and the lower end mouth of pipe, distance L 1 is determined according to processing technology and practical application, can change the size of resonant frequency by adjustable range L1, thereby change the sound absorption frequency characteristic of sheet material.Simultaneously, the shape of aperture 32 is not limit yet, and such as being circular hole, can be long and narrow hole yet.
After rigid pipe fitting 3 was inserted in the through hole 2, the percentage of open area of plastic foamboard 1 all should remain on 1%～5%, and preferably 1%～2.5%.
For overcoming the not withstand voltage shortcoming of foamed material, the material requirements of rigid pipe fitting 3 has Pressive bending resistance intensity preferably among the present invention, generally selects metal or rigid plastic etc. for use.Simultaneously, as shown in Figure 7, the rigid pipe fitting 3 among the present invention can also constitute pressure-resistance structure with the rigidity plane materiel.
By description to structure of the present invention, can know the present invention actual be the combination of a plurality of resonance sound-absorbing devices, as shown in Figure 8, the mouth of pipe 31 of each rigid pipe fitting 3 all can be considered the little opening of resonance sound-absorbing device, its diameter is D1; The mouth of pipe 31 can be considered the pore-throat minimum length of resonance sound-absorbing device apart from the bee-line L1 of aperture 32 on rigid pipe fitting 3 tube walls; Plastic foamboard 1 hole own is considered as a big cavity V1.The sound wave transport process is: sound enters from the mouth of pipe 31, through the pore-throat minimum length of rigid pipe fitting 3, enters into the hole of plastic foamboard 1 then by the aperture 32 on rigid pipe fitting 3 tube walls, and when passing through the pore-throat of L1 length at least, acoustic energy is consumed.Suitably dwindle the size of the mouth of pipe 31, increase the hole of plastic foamboard 1 itself, can obtain lower resonant frequency, strengthen the medium and low frequency acoustically effective.
Preparation method of the present invention is:
1, material is selected: the flat board that plastic foamboard 1 selects polyurethane, phenolic aldehyde, polyimide, polystyrene, Polyvinylchloride, urea aldehyde or polyoxyethylene material to make; The pipe fitting that rigid pipe fitting 3 selects metal or rigid plastic to make.
2, the processing of rigid pipe fitting 3: the internal diameter of rigid pipe fitting 3 is not more than 1mm, leaves the aperture that some are communicated with bore on its tube wall.Aperture leaves certain distance apart from the mouth of pipe.
3, the processing of plastic foamboard 1: plastic foamboard 1 surface working is smooth, on plastic foamboard 1 according to the mode of square arrangement or rounded projections arranged, with the corresponding through hole 2 of offering of rigid pipe fitting 3 external diameters.
4, assembling: the rigid pipe fitting 3 that will prepare is installed in the through hole 2 that plastic foamboard 1 holds successfully in advance, and the pipe shaft of rigid pipe fitting 3 and through hole 2 are closely cooperated, and two mouths of pipe 31 of rigid pipe fitting 3 are communicated with the external world.The percentage of open area that assembles the plastic foamboard 1 behind the rigid pipe fitting 3 is 1%～5%.
5, finishing: after assembling was finished, refacing made it smooth, makes two mouths of pipe 31 of rigid pipe fitting 3 not blocked.
In the said method, according to the bore size size of through hole 2, assembling process can take two kinds of methods to guarantee that rigid pipe fitting 3 closely cooperates with through hole 2: one, if the bore size of through hole 2 is littler than rigid pipe fitting 3 external diameters, rigid pipe fitting 3 directly can be inserted in the through hole 2, realize closely equipped; Two, if the bore size of through hole 2 and rigid pipe fitting 3 external diameters are quite or bigger, then at the aperture 32 of rigid pipe fitting 3 apart from the elder generation of distance L 1 place between the mouth of pipe 31 coating adhesive, and then be inserted in the through hole 2.
Be one embodiment of the present of invention below:
1, chooses polyurethane foam plastics sheet material, thickness is 50mm, (100～800Hz) average sound absorption coefficient is 0.34, and (1000～5000Hz) average sound absorption coefficient is 0.73 to high frequency to record the medium and low frequency of material by GBJ 88-1985 " Code for measurement of soundabsorbing coefficient and specific acoustic inpedance of standingwave ".
2, leave through hole by square arrangement on polyurethane foam plastics sheet material, pitch of holes is 10mm.
3, choose the rigid pipe fitting of hard PVC plastics and be installed in the polyurethane foam plastics sheet material through hole 2, bore D1 is 0.8mm, has narrow slit on the tube wall.
As shown in Figure 9, record its sound absorption frequency characteristic for this combination, (100～800Hz) average sound absorption coefficient is 0.45 to medium and low frequency, and (1000～5000Hz) average sound absorption coefficient is 0.76 to high frequency.Compare with the pure foam plate of the not perforate of same thickness, the sound absorbing capabilities of medium and low frequency is significantly improved.
Claims (10)
1, a kind of sponge plastics perforation acoustic board, it is characterized in that: it comprises a plastic foamboard, offer some through holes on the described plastic foamboard, a rigid pipe fitting is installed in each described through hole, the two ends mouth of pipe of described rigid pipe fitting communicates with atmosphere, offer some apertures on the tube wall of described rigid pipe fitting, described aperture communicates with the inner chamber of described rigid pipe fitting.
2, a kind of sponge plastics perforation acoustic board as claimed in claim 1, it is characterized in that: the percentage of open area that the described plastic foamboard of described rigid pipe fitting is installed is 1%～5%.
3, a kind of sponge plastics perforation acoustic board as claimed in claim 1 is characterized in that: the arrangement of described through hole on described plastic foamboard is one of square or rounded projections arranged mode.
4, a kind of sponge plastics perforation acoustic board as claimed in claim 2 is characterized in that: the arrangement of described through hole on described plastic foamboard is one of square or rounded projections arranged mode.
5, as claim 1 or 2 or 3 or 4 described a kind of sponge plastics perforation acoustic boards, it is characterized in that: the bore of described rigid pipe fitting is not more than 1mm.
6, as claim 1 or 2 or 3 or 4 described a kind of sponge plastics perforation acoustic boards, it is characterized in that: the described aperture of offering on the described rigid pipe fitting tube wall has certain distance apart from the two ends mouth of pipe of described rigid pipe fitting.
7, a kind of sponge plastics perforation acoustic board as claimed in claim 5 is characterized in that: the described aperture of offering on the described rigid pipe fitting tube wall has certain distance apart from the two ends mouth of pipe of described rigid pipe fitting.
8, a kind of method for preparing sponge plastics perforation acoustic board as claimed in claim 1, it is characterized in that: it may further comprise the steps,
(1) material is selected: described plastic foamboard is chosen as the flat board that one of polyurethane, phenolic aldehyde, polyimide, polystyrene, Polyvinylchloride, urea aldehyde or polyoxyethylene material are made, and described rigid pipe fitting is chosen as the pipe fitting that one of metal or hard plastics are made;
(2) processing of described rigid pipe fitting: the internal diameter of described rigid pipe fitting is processed as and is not more than 1mm, offers the aperture of some and described rigid pipe fitting intracavity inter-connection on the tube wall of described rigid pipe fitting, and described aperture leaves certain distance apart from the mouth of pipe;
(3) processing of described plastic foamboard: described Foam Plastic Surface processing is smooth, offers some through holes on it;
(4) assembling: described rigid pipe fitting closely cooperated to be installed in the described through hole on the described plastic foamboard, and two mouths of pipe of described rigid pipe fitting communicate with the external world; The percentage of open area that the described plastic foamboard of described rigid pipe fitting is installed is 1%～5%;
(5) finishing: the polishing surface, make surfacing, two mouths of pipe of clearing up described rigid pipe fitting make it communicate with the external world.
9, the preparation method of a kind of sponge plastics perforation acoustic board as claimed in claim 8 is characterized in that: the bore size of described through hole is more smaller than the external diameter of described rigid pipe fitting, and described through hole and described rigid pipe fitting are closely equipped.
10, the preparation method of a kind of sponge plastics perforation acoustic board as claimed in claim 8, it is characterized in that: the bore size of described through hole is more bigger than the external diameter of described rigid pipe fitting, is inserted in the described through hole behind the distance coating adhesive between the aperture on the described rigid pipe fitting tube wall and the mouth of pipe of described rigid pipe fitting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810115676XA CN101315768B (en) | 2008-06-26 | 2008-06-26 | Sponge plastics perforation and sound absorption board and method for producing the same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810115676XA CN101315768B (en) | 2008-06-26 | 2008-06-26 | Sponge plastics perforation and sound absorption board and method for producing the same |
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| CN101315768A true CN101315768A (en) | 2008-12-03 |
| CN101315768B CN101315768B (en) | 2011-05-18 |
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| CN200810115676XA Expired - Fee Related CN101315768B (en) | 2008-06-26 | 2008-06-26 | Sponge plastics perforation and sound absorption board and method for producing the same |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101618611B (en) * | 2009-07-31 | 2012-10-17 | 北京市射线应用研究中心 | Urethane foam composite board and preparation method thereof |
| CN103968362A (en) * | 2013-12-24 | 2014-08-06 | 华电重工股份有限公司 | Design method, structure and application of perforated sound absorber inside waste heat boiler |
| CN103970935A (en) * | 2013-12-24 | 2014-08-06 | 华电重工股份有限公司 | Method for identifying noise source in waste heat boiler |
| CN104078036A (en) * | 2014-06-19 | 2014-10-01 | 上海交通大学 | Low and medium frequency light thin layer sound insulation and absorption board and combined board thereof |
| CN106782475A (en) * | 2015-11-21 | 2017-05-31 | 厦门嘉达声学技术有限公司 | Composite resonant sound absorption structure |
| CN106881563A (en) * | 2015-12-16 | 2017-06-23 | 中国人民解放军空军工程大学 | A kind of preparation method of foamed aluminium-metal tube composite |
| CN109139766A (en) * | 2017-06-15 | 2019-01-04 | 湖南尚成新材料科技有限责任公司 | A kind of buffer structure of aerogel-congtg |
| CN113192478A (en) * | 2021-03-19 | 2021-07-30 | 阳春新钢铁有限责任公司 | Noise reduction method for bar finishing area |
| CN114170991A (en) * | 2021-11-09 | 2022-03-11 | 中科建声(苏州)新材料科技有限公司 | Miniaturized broadband low-frequency noise elimination pipeline |
| CN114992418A (en) * | 2022-07-12 | 2022-09-02 | 合肥美的电冰箱有限公司 | Silencer assembly for pipeline, pipeline silencing device and refrigerator |
Family Cites Families (3)
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| CN2263307Y (en) * | 1996-04-23 | 1997-09-24 | 王春生 | Sound-deadening plate for air conditioner |
| CN1148719C (en) * | 2000-01-25 | 2004-05-05 | 中国科学院声学研究所 | Resonant sound-absorbing tube bundle type perforated-plate structure |
| CN1175152C (en) * | 2001-08-15 | 2004-11-10 | 北新建材(集团)有限公司 | Mineal wool sound-absorbing board with silent function and prepatation method thereof |
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2008
- 2008-06-26 CN CN200810115676XA patent/CN101315768B/en not_active Expired - Fee Related
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101618611B (en) * | 2009-07-31 | 2012-10-17 | 北京市射线应用研究中心 | Urethane foam composite board and preparation method thereof |
| CN103968362A (en) * | 2013-12-24 | 2014-08-06 | 华电重工股份有限公司 | Design method, structure and application of perforated sound absorber inside waste heat boiler |
| CN103970935A (en) * | 2013-12-24 | 2014-08-06 | 华电重工股份有限公司 | Method for identifying noise source in waste heat boiler |
| CN103968362B (en) * | 2013-12-24 | 2016-01-13 | 华电重工股份有限公司 | For the method for designing of the perforation sound absorber of waste heat boiler inside, structure and application |
| CN103970935B (en) * | 2013-12-24 | 2017-02-08 | 华电重工股份有限公司 | Method for identifying noise source in waste heat boiler |
| CN104078036A (en) * | 2014-06-19 | 2014-10-01 | 上海交通大学 | Low and medium frequency light thin layer sound insulation and absorption board and combined board thereof |
| CN106782475A (en) * | 2015-11-21 | 2017-05-31 | 厦门嘉达声学技术有限公司 | Composite resonant sound absorption structure |
| CN106782475B (en) * | 2015-11-21 | 2020-02-28 | 厦门嘉达声学技术有限公司 | Composite resonance sound absorption structure |
| CN106881563A (en) * | 2015-12-16 | 2017-06-23 | 中国人民解放军空军工程大学 | A kind of preparation method of foamed aluminium-metal tube composite |
| CN109139766A (en) * | 2017-06-15 | 2019-01-04 | 湖南尚成新材料科技有限责任公司 | A kind of buffer structure of aerogel-congtg |
| CN113192478A (en) * | 2021-03-19 | 2021-07-30 | 阳春新钢铁有限责任公司 | Noise reduction method for bar finishing area |
| CN114170991A (en) * | 2021-11-09 | 2022-03-11 | 中科建声(苏州)新材料科技有限公司 | Miniaturized broadband low-frequency noise elimination pipeline |
| CN114992418A (en) * | 2022-07-12 | 2022-09-02 | 合肥美的电冰箱有限公司 | Silencer assembly for pipeline, pipeline silencing device and refrigerator |
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| CN101315768B (en) | 2011-05-18 |
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