CN203145220U - Metal wedge - Google Patents
Metal wedge Download PDFInfo
- Publication number
- CN203145220U CN203145220U CN 201320076949 CN201320076949U CN203145220U CN 203145220 U CN203145220 U CN 203145220U CN 201320076949 CN201320076949 CN 201320076949 CN 201320076949 U CN201320076949 U CN 201320076949U CN 203145220 U CN203145220 U CN 203145220U
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- wedge
- metal
- perforated
- sound absorption
- perforated plate
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Abstract
The utility model relates to a metal wedge. A case of the wedge is a metal perforated plate, the turning corner part of the wedge adopts the lock type connection, sound absorption filling materials are filled inside the wedge, and a surface protection layer is arranged between the metal perforated plate and the filling materials. The metal wedge provided by the utility model has the advantages that the structure is solid and firm, and the surface anti-collision and anti-impact performance is good because the outer surface is completely covered by metal. The environment-friendly sound absorption materials are filled inside the wedge, the surface protection materials are arranged between the metal perforated plate and the filling materials, the internal filling materials cannot escape even when high-speed air flows exist outside, and the acoustic performance stability of the wedge is ensured.
Description
Technical field
The utility model relates to a kind of for the sound absorption construction of eliminating the noise, and relates more specifically to a kind of metal wedge of environmental protection.
Background technology
The wedge sound absorption construction comes across the forties in 20th century the earliest, so far the history in year surplus in the of existing 60.Shown in Figure 1 is Wedge structure at present commonly used.The structure that increases gradually from the top to the bottom of wedge Absorption System has realized when satisfying bigger sound absorption area and the coupling of air impedance (namely transition theory) gradually.
Acoustic impedance is defined as the characteristic of material, the ability that namely stops sound wave to be propagated:
Z＝ρ·c
Wherein Z is the sound wave resistance, and ρ is Media density, the c velocity of sound.
The inertia of the molecular structure of material and material constituent will influence acoustic impedance, and acoustic impedance is especially big at the interface at two kinds of different materials.When impedance has a long way to go between the different materials, most acoustic wave energies will be reflected; When the impedance contrast distance is very little between the different materials, sound wave will import in the sound absorption material of porous.
Inner much little space and the cavitys that exist of sound absorption material, incident acoustic wave will propagate in these spaces, and concussion repeatedly back and forth therein.Frictional force in these spaces and air resistance cause acoustic wave energy to be transformed into heat energy.When sound absorption material appears at the sound wave crest location, maximum absorptivity will appear, and be exactly the position of maximum absorbance from reflection metope λ/4 distances, so the length of wedge is determined according to λ/4 by frequency usually.
Acoustic characteristic sound absorption coefficient commonly used represents that corresponding low-limit frequency is called cut-off frequency when sound absorption coefficient is not less than 0.99, and it depends primarily on profile (comprising length and shape) and the material (comprising surface material and packing material) of wedge.Usually:
A) length L of wedge has determined cut-off frequency.Usually the length of wedge is not less than 1/4 wavelength of corresponding cut-off frequency;
B) wedge tip (being the L1 part) is more long, and wedge low frequency absorption performance is more good;
C) wedge base portion (being the L2 part) mainly plays very big influence to the absorption of low frequency (less than 200HZ), absorbs then very little to high frequency.
D) wedge leaves cavity behind, is equivalent to increase wedge length, can adjust resonance frequency, improves the low frequency absorption characteristic, generally gets 5%～25% of wedge total length.
Present known wedge is common wedge, and structure adopts steel frame, and appearance covers with gauze, the traditional sound absorption material of inner filling.But, since not enough to the environmental-protecting performance research of sound absorption material, the hidden danger that all there are pernicious gas volatilizations such as formaldehyde in the laboratory of finishing built, and fire resistance property is low; Structural defective also causes internal fiber or particle to reveal (when there is air-flow the outside, particularly outstanding) easily, and wedge intensity, stability and corrosion resistance are poor, cleaning and difficult in maintenance, the shortcoming that goes up attractive in appearance.
The utility model content
The purpose of this utility model is to provide a kind of metal wedge of environment-friendly type, to overcome the above-mentioned shortcoming of existing wedge.
For achieving the above object, metal wedge provided by the invention, its structure is:
The shell of wedge is perforated metal panel, and the corner of wedge is that rumble bone formula connects; The inside of wedge is filled with the sound absorption filler, is provided with an armour layer between perforated metal panel and the filler.
Described metal wedge, wherein the perforated percentage on the perforated metal panel is transparent index greater than 20000 pass.
Described metal wedge, wherein perforated metal panel is the zinc-plated perforated plate of thickness 0.8mm, zinc-plated perforated plate surface is sprayed with polyester powder.
Described metal wedge, wherein the sound absorption filler of the inside of wedge filling is glass wool.
Described metal wedge, wherein the armour layer between perforated metal panel and the sound absorption filler is the entrant sound diaphragm seal.
The metal wedge that the utility model provides, the shell on surface is perforated metal panel, the corner of wedge is that rumble bone formula connects, rugged construction, firm, because external surface is wrapped up fully by metal, its surface is crashproof, protecting against shock is functional again.The environment-friendly type sound absorption material is filled in the inside of wedge, between perforated metal panel and the filler facing material is arranged, even there is high speed airflow the outside, inner stuffing can not overflowed yet, and guarantees that the acoustical behavior of wedge is stable.
Description of drawings
Fig. 1 is the structural representation of the metal wedge that provides of the utility model.
The specific embodiment
Elaborate below in conjunction with the utility model of Fig. 1.
The metal wedge that the utility model provides, having used for reference the acoustic impedance characteristic influences principle to acoustic propagation, has released the gradual change impedance principle.The environment-friendly type sound absorption material is filled in inside, has greatly guaranteed the acoustical behavior of Absorption System.With the perforated plate characteristic, i.e. the unified conversion of factors such as thickness, perforated percentage and aperture is the transparent prime number of sound, and contacting directly between the transparent index of release sound and the acoustical behavior simultaneously.Metal wedge of the present utility model satisfies the requirement of metal wedge sound absorption coefficient 0.99 fully.
The shell of metal Wedge structure of the present utility model is perforated metal panel 1, and present embodiment adopts thickness to be not less than the zinc-plated perforated plate of 0.8mm, and the perforated plate surface is made the spraying polyester powder and handled, and the corner of wedge is that rumble bone formula connects; Wedge inside is filled with sound absorption filler 2, and the sound absorption filler can be glass wool, is provided with an armour layer 3 between perforated metal panel and the filler, and armour layer 3 can be the entrant sound diaphragm seal.
Aspect the perforated percentage selection, if perforated percentage is excessive, influence wedge intensity; If perforated percentage is too small, then influence the wedge acoustical behavior.It is generally acknowledged that perforated percentage was greater than 30% o'clock, just can ignore the influence of perforated plate, but in fact so-called the influence only is to field of noise control during perforated percentage 30%, in the sound attenuation room field higher requirement need be arranged, and only perforated percentage is the acoustical behavior that can not react perforated plate.The utility model is according to the newest research results of industrial punched-plate association (IPA-industrial Perforators association), use " transparent index Transparency Index (TI) " as metal wedge design of shell index, the utility model selects transparent index greater than 20000 pass scheme, optimizes the acoustical behavior of metal wedge.
The sound absorption filler of filling in the metal wedge of the present utility model is to use glass fiber that the long fibre moulding process makes (such as the super glass wool of U.S. OWENS CORNING company, fire-protection rating is the A1 level), the problem that traditional glass fiber ruptures easily is resolved, and encapsulation process has been carried out in the glass fiber outside, wrapped up the entrant sound diaphragm seal, be transparent and can stop the leakage of finely ground particle substance fully at acoustics, (0～50km/h) pulsation also guarantees do not have fiber or particle discharge down at wind speed commonly used.The air quality test report of the how tame sound attenuation room that metal wedge of the present utility model has built up has all reached office's air quality standard of GB20325.The following is part and detect data:
| Formaldehyde | ≤ 0.12 milligram/meter 3 |
| TOVC (TVOC) | ≤ 0.60 milligram/meter 3 |
| Benzene | ≤ 0.09 milligram/meter 3 |
| Asbestos fiber and contain the dust of 10% above asbestos | ≤ 0.80 milligram/meter 3 |
The metal wedge absorber that the utility model provides and the contrast of the key property of known wedge are as follows:
Claims (5)
1. a metal wedge is characterized in that, the shell of wedge is perforated metal panel, and the corner of wedge is that rumble bone formula connects; The inside of wedge is filled with the sound absorption filler, is provided with an armour layer between perforated metal panel and the filler.
2. metal wedge according to claim 1 is characterized in that, the perforated percentage on the perforated metal panel is transparent index greater than 20000 pass.
3. according to claim 1 or 2 described metal wedges, it is characterized in that perforated metal panel is the zinc-plated perforated plate of thickness 0.8mm, zinc-plated perforated plate surface is sprayed with polyester powder.
4. according to the described metal wedge of claim 1, it is characterized in that the inner sound absorption filler of filling of wedge is glass wool.
5. metal wedge according to claim 1 is characterized in that, the armour layer between perforated metal panel and the sound absorption filler is the entrant sound diaphragm seal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320076949 CN203145220U (en) | 2013-02-19 | 2013-02-19 | Metal wedge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320076949 CN203145220U (en) | 2013-02-19 | 2013-02-19 | Metal wedge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203145220U true CN203145220U (en) | 2013-08-21 |
Family
ID=48972760
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320076949 Expired - Fee Related CN203145220U (en) | 2013-02-19 | 2013-02-19 | Metal wedge |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203145220U (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103485430A (en) * | 2013-09-10 | 2014-01-01 | 苏州岸肯电子科技有限公司 | Anechoic chamber |
| CN103545096A (en) * | 2013-10-19 | 2014-01-29 | 宁夏天地经纬电力设备工程有限公司 | Transformer denoising device |
| CN105155704A (en) * | 2015-06-19 | 2015-12-16 | 江苏英思达科技有限公司 | Double-layer metal wedge and manufacturing method thereof |
| CN106884485A (en) * | 2017-03-03 | 2017-06-23 | 上海声望声学科技股份有限公司 | Suitable for the sound absorbing module under air-flow environment |
| CN108487487A (en) * | 2018-04-12 | 2018-09-04 | 天津航天瑞莱科技有限公司 | A kind of compound wedge absorber |
| CN108505641A (en) * | 2018-04-12 | 2018-09-07 | 天津航天瑞莱科技有限公司 | A kind of novel wedge absorber |
| WO2022127843A1 (en) * | 2020-12-18 | 2022-06-23 | 香港大学浙江科学技术研究院 | Sound absorbing structure and sound absorbing device |
-
2013
- 2013-02-19 CN CN 201320076949 patent/CN203145220U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103485430A (en) * | 2013-09-10 | 2014-01-01 | 苏州岸肯电子科技有限公司 | Anechoic chamber |
| CN103545096A (en) * | 2013-10-19 | 2014-01-29 | 宁夏天地经纬电力设备工程有限公司 | Transformer denoising device |
| CN105155704A (en) * | 2015-06-19 | 2015-12-16 | 江苏英思达科技有限公司 | Double-layer metal wedge and manufacturing method thereof |
| CN105155704B (en) * | 2015-06-19 | 2018-05-29 | 江苏英思达科技有限公司 | A kind of double-level-metal wedge and preparation method thereof |
| CN106884485A (en) * | 2017-03-03 | 2017-06-23 | 上海声望声学科技股份有限公司 | Suitable for the sound absorbing module under air-flow environment |
| CN108487487A (en) * | 2018-04-12 | 2018-09-04 | 天津航天瑞莱科技有限公司 | A kind of compound wedge absorber |
| CN108505641A (en) * | 2018-04-12 | 2018-09-07 | 天津航天瑞莱科技有限公司 | A kind of novel wedge absorber |
| WO2022127843A1 (en) * | 2020-12-18 | 2022-06-23 | 香港大学浙江科学技术研究院 | Sound absorbing structure and sound absorbing device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130821 Termination date: 20170219 |