CN203910263U - A low frequency sound absorption structure - Google Patents
A low frequency sound absorption structure Download PDFInfo
- Publication number
- CN203910263U CN203910263U CN201420251826.0U CN201420251826U CN203910263U CN 203910263 U CN203910263 U CN 203910263U CN 201420251826 U CN201420251826 U CN 201420251826U CN 203910263 U CN203910263 U CN 203910263U
- Authority
- CN
- China
- Prior art keywords
- backboard
- microperforated panel
- frequency sound
- micropunch
- board
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Abstract
The utility model discloses a low frequency sound absorption structure which has relatively good sound absorption performance in a low frequency scope of below 500Hz and which is compact in structure. The low frequency sound absorption structure comprises a micropunch board oriented towards one side of a sound source. The micropunch board is opposite to a backboard. Side boards are positioned on peripheries of the micropunch board and the backboard, and connect the micropunch board and the backboard. A rear cavity where an air layer is positioned is arranged between the micropunch board and the backboard. The micropunch board is a micropunch board of a parallel connection structure. The two ends of the micropunch board are provided with bent portions. The bend portions are component parts of the side boards and are connected with the backboard. No punched hole exists in the bent portions. A skeleton positioned on the inner sides of the side boards is arranged between the micropunch board and the backboard. The skeleton is connected with the backboard. The low frequency sound absorption performance of the low frequency sound absorption structure is relatively good; the structure is compact; the low frequency sound absorption structure is energy saving and environmental friendly and is especially applicable to low frequency sound absorption noise reduction in transformer substations.
Description
Technical field
The utility model relates to noise control and field of environment protection, especially a kind of low-frequency sound-absorbing structure.
Background technology
The main noise source of transformer station is transformer, and transformer noise presents obvious low frequency characteristic, and main strong noise frequency concentrates between 31.5Hz～500Hz, and crest frequency is generally 100Hz, 200Hz and 400Hz.
The mode that transformer station's noise reduction adopts " sound absorber, sound barrier " to combine more is at present carried out noise-reducing design.The acoustic absorbant that the sound absorber of applying now in transformer station and sound barrier use mostly is sound-absorbing porous material, and its medium-high frequency sound absorbing capabilities is good, but low frequency absorption slightly inferior properties can not meet the object to transformer low frequency sqouynd absorption lowering noise.
Microperforated panel soundabsorbing construction is a kind of simple in structure, and the sound absorption structure that sound absorbing capabilities is good can be by the sound absorption characteristics of the parameter change microperforated panel soundabsorbing constructions such as the aperture of adjusting microperforated panel, pitch-row, percentage of perforation, thickness of slab, cavity size.Microperforated panel soundabsorbing construction is a case structure, it comprises the microperforated panel towards sound source one side, microperforated panel is relative with the backboard that is generally rigid plate, surrounding is connected the two by side plate, it between microperforated panel and backboard, is the back of the body chamber at air layer place, on backboard, side plate, all without perforate, back of the body chamber only communicates with the external world via the hole on microperforated panel.Conventional microperforated panel is wanted at (the good sound absorbing capabilities of acquisition in the low-frequency range below 500Hz, can only select larger cavity, be that air layer thickness is thicker, more than need reaching 400mm, this is subject to larger restriction in actual applications, and because the sound sucting band of microperforated panel soundabsorbing construction is narrower, being conventionally no more than 2 octave bands, resonance sound-absorbing coefficient is lower.Above two kinds of factors cause microperforated panel soundabsorbing construction to be subject to restriction in transformer station's noise reduction application.
Utility model content
For overcoming the deficiency of existing transformer station denoising structure low frequency absorption poor-performing, technical problem to be solved in the utility model is to provide a kind of low-frequency range below 500Hz and has better sound absorbing capabilities, simultaneously the low-frequency sound-absorbing structure of compact conformation.
The utility model solves the technical scheme that its technical matters adopts: low-frequency sound-absorbing structure, comprise the microperforated panel towards sound source one side, microperforated panel is relative with backboard, surrounding is connected the two by side plate, between microperforated panel and backboard, be the back of the body chamber at air layer place, the microperforated panel that described microperforated panel is parallel-connection structure.
Described parallel-connection structure microperforated panel has the hole in two kinds of apertures, and the diameter of macropore is 0.8～1.1mm, and the percentage of perforation of macropore is 0.06～0.24%, and the diameter of aperture is 0.3～0.6mm, and the percentage of perforation of aperture is 0.16～0.69%.
The diameter of described macropore is 1 ± 0.1mm, and the percentage of perforation of macropore is 0.06～0.09%, and the diameter of aperture is 0.5 ± 0.05mm, and the percentage of perforation of aperture is 0.4～0.69%.
Described macropore, aperture be layout in column in a row all, and the pitch-row of macropore is 30～35mm, and the pitch-row of aperture is 6～7mm.
The thickness of described air layer is 75～200mm.
There is bending part at the two ends of described microperforated panel, and the ingredient that bending part is side plate is also connected with backboard, and bending part is without perforation.
Between described microperforated panel and backboard, be provided be positioned at side plate with skeleton, described skeleton is connected with backboard.
Described skeleton and backboard welding.
The thickness of slab of described microperforated panel is 0.75～1mm.
The beneficial effects of the utility model are: use for reference existing microperforated panel soundabsorbing construction, adopt the microperforated panel of parallel-connection structure to replace the microperforated panel in conventional single aperture, obtain preferably sound absorption structure of low frequency absorption performance, its frequency range that partly absorbs sound can reach 65Hz～550Hz, and back of the body chamber air layer thickness requires significantly reduction, compact conformation, and do not use resistive acoustic absorbant, simple in structure, energy-conserving and environment-protective, are specially adapted to transformer station's low frequency absorption noise reduction.
Brief description of the drawings
Fig. 1 is the schematic diagram of existing single aperture microperforated panel soundabsorbing construction.
Fig. 2 is the schematic diagram of the utility model low-frequency sound-absorbing structure.
Fig. 3 is the schematic diagram of the bore size of parallel-connection structure microperforated panel in Fig. 2.
In figure, be labeled as: 1-microperforated panel, 2-air layer, 3-backboard, 4-side plate, 5-skeleton, 10-bending part, 11-macropore, 12-aperture, the large bore dia of d1-, d2-hole diameter, δ 1-macropore pitch-row, δ 2-aperture pitch-row.
Embodiment
Below in conjunction with drawings and Examples, the utility model is further illustrated.
As shown in Figure 2 and Figure 3, low-frequency sound-absorbing structure of the present utility model comprises the microperforated panel 1 towards sound source one side, microperforated panel 1 is relative with backboard 3, surrounding by side plate 4 by the two connection, between microperforated panel 1 and backboard 3, be the back of the body chamber at air layer 2 places, the microperforated panel that described microperforated panel 1 is parallel-connection structure.The microperforated panel of alleged parallel-connection structure is the micropunch that two or more different pore sizes, different spacing are set on a thin plate; And the microperforated panel of cascaded structure is that micropunch is set on two different thin plates, two boards is arranged in parallel.
Find through test, adopt parallel-connection structure microperforated panel to replace after conventional microperforated panel, even if air layer thickness selects reduced size for example when 100mm, low frequency absorption performance is more excellent, can have two resonance sound-absorbing peak values, peak value acoustical absorption coefficient is higher, can reach more than 0.7, and half sound sucting band can be extended to 2～3 octave bands, the frequency range that partly absorbs sound of sound absorption structure has increased.Above-mentioned gratifyingly change makes low-frequency sound-absorbing structure of the present utility model be very suitable for the low frequency absorption below 500Hz, does not comprise again any resistive acoustic absorbant, simple in structure, and energy-conserving and environment-protective are particularly suitable for the noise reduction demand of transformer station.
The utility model low-frequency sound-absorbing structure can be used as the field such as suspended absorber, sound absorption ash wall body plate, for suspended absorber structure, can adopt and hang or be fixed on body of wall, roof, also can cancel backboard 3, and form resonance sound-absorbing structure using rigid plane as backboard.Sound absorption ash wall body plate can be applicable to sound barrier or other regions as body of wall, the requirement of roof boarding sound absorption, only need adjust according to sound barrier steel construction, body of wall, roof structure the mounting means of sound absorption structure.
Conventionally taking penetration hole diameter, the perforated plate below 1mm is called microperforated panel in this area.While being applied to the utility model, described in recommendations for selection, parallel-connection structure microperforated panel has the hole in two kinds of apertures, the diameter of macropore 11 is 0.8～1.1mm, the percentage of perforation of macropore 11 is 0.06～0.24%, the diameter of aperture 12 is 0.3～0.6mm, the percentage of perforation of aperture 12 is 0.16～0.69%, is convenient to processing, and in low-frequency range, sound absorbing capabilities is more excellent.
Further preferred result is: the diameter of described macropore 11 is 1 ± 0.1mm, the percentage of perforation of macropore 11 is 0.06～0.09%, the diameter of aperture 12 is 0.5 ± 0.05mm, the percentage of perforation of aperture 12 is 0.4～0.69%, there are two resonance sound-absorbing peak values, be respectively 100Hz and 300Hz, centre frequency 200Hz, peak value acoustical absorption coefficient is not less than 0.7. and is specially adapted to substation transformer Sound source noise in 100Hz and the high feature of frequency multiplication peak value thereof.
The preferred material of parallel-connection structure microperforated panel is aluminium sheet, galvanized sheet, corrosion resistant plate etc., and the preferred material of backboard is galvanized steel plain sheet, aluminium alloy plate, corrosion resistant plate etc., and the preferred material of skeleton is galvanized steel plain sheet, aluminium alloy plate, corrosion resistant plate etc.The sound insulation property of this metalloid material itself is more excellent, can not only meet the requirement of low frequency absorption, and its weighted transmission loss is generally not less than 30dB, can meet conventional sound insulation and noise reducing requirement, can meet sound absorption, the requirement of sound insulation comprehensive Noise Reduction.
Making for simplifying, can be that the two ends of microperforated panel 1 have bending part 10, and the ingredient that is side plate 4 by bending part 10 is also connected with backboard 3, and bending part 10 is without boring a hole.
According to the concrete size of the utility model low-frequency sound-absorbing structure, when as larger in plate face size, for ensureing the thickness of air layer 2, holding plate face is smooth, acoustically effective is good, should between described microperforated panel 1 and backboard 3, be provided with the skeleton 5 that is positioned at side plate 4, and described skeleton 5 is connected with backboard 3., microperforated panel 1 can be connected with skeleton 5 meanwhile, for example, by the two riveted joint.Skeleton 5 mainly plays the effect of supporting microperforated panel 1.In sound absorption structure size hour, can cancel the skeleton 5 for supporting.
Preferred described skeleton 5 welds with backboard 3.
According to the applied environment of transformer station, the thickness of slab that can select microperforated panel 1 used in the utility model low-frequency sound-absorbing structure is 0.75～1mm.
In following table 1, list inventor and applied parallel-connection structure microperforated panel in the time of the utility model low-frequency sound-absorbing structure, corresponding sound absorbing capabilities results of measuring.
Table 1 microperforated panel specification and sound absorbing capabilities results of measuring
From above result, select after parallel-connection structure microperforated panel, the utility model low-frequency sound-absorbing structure partly absorb sound frequency range between 65Hz～550Hz, be specially adapted to the situation that transformer station's low frequency noise is 65Hz～500Hz, low frequency absorption performance is more excellent, have two resonance sound-absorbing peak values, and half sound sucting band can be extended to 2～3 octave bands, be specially adapted to substation transformer Sound source noise in 100Hz and the high feature of frequency multiplication peak value thereof.
embodiment 1:
As shown in Figure 2 and Figure 3, the utility model low-frequency sound-absorbing structure comprises the microperforated panel 1 towards the parallel-connection structure of sound source one side, microperforated panel 1 is relative with backboard 3, surrounding by side plate 4 by the two connection, there is bending part 10 at the two ends of microperforated panel 1, the ingredient that bending part 10 is side plate 4 also welds with backboard 3, and bending part 10, without perforation, is the back of the body chamber at air layer 2 places between microperforated panel 1 and backboard 3.Backboard 3 is with skeleton 5 by being welded to connect, and the microperforated panel 1 of parallel-connection structure is fixed on skeleton 5 by rivet, and side plate 4 is welded to connect with microperforated panel 1 and the backboard 3 of parallel-connection structure, forms the inner cavity that holds air layer 2.For ensureing the sealing of resonant structure, gap place can pass through sealant sealing.The microperforated panel of described parallel-connection structure has the hole in two kinds of apertures, the diameter d 1=1mm of macropore 11, the diameter d 2=0.5mm of aperture 12, macropore 11, aperture 12 are all in a row in column uniform, the pitch-row δ 1=30mm of macropore, the pitch-row δ 2=6mm of aperture, the thickness of air layer 2 is 100mm, the thickness of microperforated panel is 1mm.
Through measuring and calculating, the resonant frequency of this structure is 100Hz and 200Hz, and half absorption band width is 67-554 Hz.
embodiment 2:
As shown in Figure 2 and Figure 3, the utility model low-frequency sound-absorbing structure comprises the microperforated panel 1 towards the parallel-connection structure of sound source one side, microperforated panel 1 is relative with backboard 3, surrounding by side plate 4 by the two connection, there is bending part 10 at the two ends of microperforated panel 1, the ingredient that bending part 10 is side plate 4 also welds with backboard 3, and bending part 10, without perforation, is the back of the body chamber at air layer 2 places between microperforated panel 1 and backboard 3.Backboard 3 is with skeleton 5 by being welded to connect, and the microperforated panel 1 of parallel-connection structure is fixed on skeleton 5 by rivet, and side plate 4 is welded to connect with microperforated panel 1 and the backboard 3 of parallel-connection structure, forms the inner cavity that holds air layer 2.For ensureing the sealing of resonant structure, gap place can pass through sealant sealing.The microperforated panel of described parallel-connection structure has the hole in two kinds of apertures, the diameter d 1=1mm of macropore 11, the diameter d 2=0.5mm of aperture 12, macropore 11, aperture 12 are all in a row in column uniform, the pitch-row δ 1=35mm of macropore, the pitch-row δ 2=7mm of aperture, the thickness of air layer 2 is 100mm, the thickness of microperforated panel is 0.75mm.
Through measuring and calculating, the resonant frequency of this structure is 100Hz and 300Hz, and half absorption band width is 75-520 Hz.
Claims (9)
1. low-frequency sound-absorbing structure, comprise the microperforated panel (1) towards sound source one side, microperforated panel (1) is relative with backboard (3), surrounding by side plate (4) by the two connection, between microperforated panel (1) and backboard (3), be the back of the body chamber at air layer (2) place, it is characterized in that: the microperforated panel that described microperforated panel (1) is parallel-connection structure.
2. low-frequency sound-absorbing structure as claimed in claim 1, it is characterized in that: described microperforated panel (1) has the hole in two kinds of apertures, the diameter of macropore (11) is 0.8～1.1mm, the percentage of perforation of macropore (11) is 0.06～0.24%, the diameter of aperture (12) is 0.3～0.6mm, and the percentage of perforation of aperture (12) is 0.16～0.69%.
3. low-frequency sound-absorbing structure as claimed in claim 2, it is characterized in that: the diameter of described macropore (11) is 1 ± 0.1mm, the percentage of perforation of macropore (11) is 0.06～0.09%, and the diameter of aperture (12) is 0.5 ± 0.05mm, and the percentage of perforation of aperture (12) is 0.4～0.69%.
4. low-frequency sound-absorbing structure as claimed in claim 3, is characterized in that: all layouts in column in a row of described macropore (11), aperture (12), and the pitch-row of macropore (11) is 30～35mm, the pitch-row of aperture (12) is 6～7mm.
5. the low-frequency sound-absorbing structure as described in claim 1,2,3 or 4, is characterized in that: the thickness of described air layer (2) is 75～200mm.
6. the low-frequency sound-absorbing structure as described in claim 1,2,3 or 4, it is characterized in that: there is bending part (10) at the two ends of described microperforated panel (1), bending part (10) is the ingredient of side plate (4) and is connected with backboard (3), the perforation of bending part (10) nothing.
7. the low-frequency sound-absorbing structure as described in claim 1,2,3 or 4, is characterized in that: between described microperforated panel (1) and backboard (3), be provided be positioned at side plate (4) with skeleton (5), described skeleton (5) is connected with backboard (3).
8. low-frequency sound-absorbing structure as claimed in claim 7, is characterized in that: described skeleton (5) and backboard (3) welding.
9. the low-frequency sound-absorbing structure as described in claim 1,2,3 or 4, is characterized in that: the thickness of slab of described microperforated panel (1) is 0.75～1mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420251826.0U CN203910263U (en) | 2014-05-16 | 2014-05-16 | A low frequency sound absorption structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420251826.0U CN203910263U (en) | 2014-05-16 | 2014-05-16 | A low frequency sound absorption structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203910263U true CN203910263U (en) | 2014-10-29 |
Family
ID=51784520
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420251826.0U Active CN203910263U (en) | 2014-05-16 | 2014-05-16 | A low frequency sound absorption structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203910263U (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105587690A (en) * | 2015-05-25 | 2016-05-18 | 中国船舶重工集团公司第七○二研究所 | Microhole plate sound absorption grating |
| CN106223222A (en) * | 2016-09-14 | 2016-12-14 | 东南大学 | Acoustic barrier unit board based on broadband porous plate acoustic adsorption device and method for designing thereof |
| CN106288062A (en) * | 2016-08-31 | 2017-01-04 | 北京市劳动保护科学研究所 | A kind of air cleaning compound sound-absorption structural |
| CN106531142A (en) * | 2016-10-20 | 2017-03-22 | 中国电力科学研究院 | Noise-reducing device for transformer substation |
| CN108385849A (en) * | 2017-11-14 | 2018-08-10 | 同济大学 | Three-dimensional alliteration impedance micropunch period ultrabroad band flush sound absorption structure |
| CN108866967A (en) * | 2018-08-02 | 2018-11-23 | 海信（山东）冰箱有限公司 | A kind of denoising structure for washing machine |
| CN109458736A (en) * | 2018-12-24 | 2019-03-12 | 广东美的白色家电技术创新中心有限公司 | Gas water-heater housing and gas heater |
| CN112623168A (en) * | 2020-11-19 | 2021-04-09 | 西北工业大学 | Large-scale underwater platform noise reduction covering layer with space bending composite decoupling mechanism |
| CN114525743A (en) * | 2022-03-11 | 2022-05-24 | 中铁二院工程集团有限责任公司 | Sound barrier smoke exhaust sound absorber and closed sound barrier |
-
2014
- 2014-05-16 CN CN201420251826.0U patent/CN203910263U/en active Active
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105587690A (en) * | 2015-05-25 | 2016-05-18 | 中国船舶重工集团公司第七○二研究所 | Microhole plate sound absorption grating |
| CN106288062A (en) * | 2016-08-31 | 2017-01-04 | 北京市劳动保护科学研究所 | A kind of air cleaning compound sound-absorption structural |
| CN106223222A (en) * | 2016-09-14 | 2016-12-14 | 东南大学 | Acoustic barrier unit board based on broadband porous plate acoustic adsorption device and method for designing thereof |
| CN106531142A (en) * | 2016-10-20 | 2017-03-22 | 中国电力科学研究院 | Noise-reducing device for transformer substation |
| CN108385849A (en) * | 2017-11-14 | 2018-08-10 | 同济大学 | Three-dimensional alliteration impedance micropunch period ultrabroad band flush sound absorption structure |
| CN108866967A (en) * | 2018-08-02 | 2018-11-23 | 海信（山东）冰箱有限公司 | A kind of denoising structure for washing machine |
| CN109458736A (en) * | 2018-12-24 | 2019-03-12 | 广东美的白色家电技术创新中心有限公司 | Gas water-heater housing and gas heater |
| CN112623168A (en) * | 2020-11-19 | 2021-04-09 | 西北工业大学 | Large-scale underwater platform noise reduction covering layer with space bending composite decoupling mechanism |
| CN114525743A (en) * | 2022-03-11 | 2022-05-24 | 中铁二院工程集团有限责任公司 | Sound barrier smoke exhaust sound absorber and closed sound barrier |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203910263U (en) | A low frequency sound absorption structure | |
| CN207260354U (en) | A kind of noise control damping Acoustic barrier plate | |
| CN104485096A (en) | Noise reduction sound absorption layer | |
| CN204356925U (en) | A kind of indoor substation low frequency absorption denoising device | |
| CN201199437Y (en) | Sound isolation sound-absorbing baffle | |
| CN205194322U (en) | Broadband microperforated panel acoustic absorber based on cycle temper back of body chamber | |
| CN103971671A (en) | Composite low-frequency resonance sound absorption structure | |
| CN202299233U (en) | Sound-absorption sound-proof panel | |
| CN210639979U (en) | Inhale sound insulation composite member and transformer | |
| CN103606441B (en) | A kind of transformator noise reduction sound absorber | |
| CN203895113U (en) | Composite low frequency resonance sound absorption structure | |
| CN104088421A (en) | Acoustic panel | |
| CN204760018U (en) | Micropore honeycomb sound absorbing structure | |
| CN202745228U (en) | Metal sound insulation low-frequency acoustic board | |
| CN204185964U (en) | A kind of sound-absorbing wall | |
| CN203571997U (en) | Sound insulation structure for outer wall plate of air conditioning cabinet | |
| CN206956968U (en) | A kind of sqouynd absorption lowering noise metope | |
| CN210896602U (en) | Cavity sound absorption structure of sound absorption protective surface of double-sided metal perforated plate in acoustic laboratory | |
| CN210713506U (en) | Perforated sound-absorbing composite aluminum plate | |
| CN206143942U (en) | Acoustic absorber unit based on three -dimensional grid formula structure | |
| CN106049696B (en) | A kind of sound absorption body unit based on stereoscopic graticule format structure | |
| CN210652170U (en) | Anticorrosive amortization tuber pipe panel and anticorrosive amortization tuber pipe | |
| CN105908853A (en) | Soundproof gypsum board | |
| CN210569007U (en) | Corner ventilation noise eliminator for silent room | |
| JP2005273273A (en) | Acoustic panel and sound absorbing/sound insulating device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: Wenjiang District 611130 of Sichuan city of Chengdu province Chengdu Strait science and Technology Industry Development Park Haike Road West No. 57 Patentee after: Positive ascension environment Polytron Technologies Inc Address before: 611130, No. 388, Taiwan Avenue, Wenjiang Strait science and Technology Park, Sichuan, Chengdu Patentee before: Sichuan Zhengsheng Acoustic Technology Co., Ltd. |
|
| CP03 | Change of name, title or address |