CN111862922A - Low-frequency noise reduction and silencing sheet - Google Patents
Low-frequency noise reduction and silencing sheet Download PDFInfo
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- CN111862922A CN111862922A CN202010801990.4A CN202010801990A CN111862922A CN 111862922 A CN111862922 A CN 111862922A CN 202010801990 A CN202010801990 A CN 202010801990A CN 111862922 A CN111862922 A CN 111862922A
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- noise reduction
- frequency noise
- silencing
- sheet
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- 230000030279 gene silencing Effects 0.000 title claims abstract description 55
- 238000010521 absorption reaction Methods 0.000 claims abstract description 31
- 239000011491 glass wool Substances 0.000 claims abstract description 22
- 239000010410 layer Substances 0.000 claims abstract description 21
- 238000005192 partition Methods 0.000 claims abstract description 20
- 239000002131 composite material Substances 0.000 claims abstract description 11
- 239000003365 glass fiber Substances 0.000 claims abstract description 11
- 239000011241 protective layer Substances 0.000 claims abstract description 10
- 230000008030 elimination Effects 0.000 claims description 12
- 238000003379 elimination reaction Methods 0.000 claims description 12
- 239000011148 porous material Substances 0.000 claims description 10
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 3
- 230000007547 defect Effects 0.000 abstract description 3
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- 239000000463 material Substances 0.000 description 5
- 238000001228 spectrum Methods 0.000 description 4
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- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
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- 230000002124 endocrine Effects 0.000 description 1
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- 230000036285 pathological change Effects 0.000 description 1
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- 238000003825 pressing Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
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Images
Classifications
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/162—Selection of materials
- G10K11/168—Plural layers of different materials, e.g. sandwiches
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
- B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
- B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/10—Inorganic fibres
- B32B2262/101—Glass fibres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/10—Properties of the layers or laminate having particular acoustical properties
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
In view of the defects of the prior art, the invention provides a low-frequency noise silencing sheet which can maximize the reduction amplitude of airflow noise or room noise. The invention provides a low-frequency noise reduction and silencing sheet which mainly comprises a silencing sheet framework, a silencing hole plate, a glass fiber protective layer, a glass wool composite sound absorption layer and a low-frequency noise reduction partition plate, wherein the silencing hole plate is filled with the glass wool composite sound absorption layer and is externally coated with the glass fiber protective layer, the low-frequency noise reduction partition plate is arranged in the middle of the low-frequency noise reduction and silencing sheet, and the low-frequency noise reduction partition plate and the silencing sheet framework and other structures are not rigidly connected.
Description
Technical Field
The invention relates to low-frequency noise elimination, in particular to low-frequency noise reduction for airflow low-frequency noise and low-frequency fields. The sound absorption and noise reduction device is suitable for low-frequency noise elimination of an airflow channel and sound absorption and noise reduction of a low-frequency place.
Background
The harm of noise to the human body is systemic, and can cause changes in the auditory system and also affect the non-auditory system. The early stage of the influence is mainly physiological change, and the long-term exposure to relatively strong noise can cause pathological change, so that people pay more and more attention to the noise hazard, particularly low-frequency noise of 20Hz-250Hz can cause abnormality of nerve, endocrine, cardiovascular and cerebrovascular, digestion, visual organs and the like, and the reduction of the low-frequency noise is socially required.
There is a high necessity for a more excellent product of the low frequency noise reduction sheet so that the reduction amplitude of the air flow noise or the room noise is maximized.
Disclosure of Invention
In view of the defects of the prior art, the invention provides a low-frequency noise silencing sheet which can maximize the reduction amplitude of airflow noise or room noise.
The invention provides a low-frequency noise reduction and silencing sheet which mainly comprises a silencing sheet framework, a silencing hole plate, a glass fiber protective layer, a composite glass wool sound absorption layer and a low-frequency noise reduction partition plate, wherein the silencing hole plate is filled with the glass wool sound absorption layer and is externally coated with the glass fiber protective layer, the low-frequency noise reduction partition plate is arranged in the middle of the low-frequency noise reduction and silencing sheet, and the low-frequency noise reduction partition plate is not rigidly connected with the silencing sheet framework and other structures.
Preferably, the framework of the low-frequency noise reduction and silencing sheet is a metal U-shaped framework.
Preferably, the silencing orifice plate and the silencing sheet framework are riveted or welded.
Preferably, the sound absorption layer is made of 32-48Kg/m composite centrifugal glass wool through high-speed thin-walled carbon fiber.
Preferably, the low-frequency noise reduction and silencing sheet is divided into a flat plate and a microporous plate by the low-frequency noise reduction partition plate.
Preferably, the framework of the low-frequency noise reduction and silencing sheet is formed by mechanical rolling.
The low-frequency noise reduction and silencing sheet is preferably characterized in that the silencing hole plate is 0.5-2.0mm thick, the hole diameter of the hole plate is 3-5mm, and regular triangles with the hole centers being 6-10mm are uniformly distributed.
Preferably, the low-frequency noise reduction and silencing sheet is formed by pressing the silencing orifice plate to form reinforcing ribs with the width of 20mm and the depth of 0.5 mm.
Preferably, the low-frequency noise reduction and noise elimination sheet is designed according to the characteristics of low-frequency noise, and the thickness of the low-frequency noise reduction and noise elimination sheet is as follows: 120mm/160mm/200mm/240mm/300 mm.
The invention designs the silencing pieces with various thicknesses according to the practical experience and theoretical basis of years and the frequency spectrum characteristic of low-frequency noise, wherein the thicknesses are different from 120mm, 160mm, 200mm, 240mm and 300mm, and the silencing quantity is more than 2-6dB (A) compared with similar products.
Drawings
Fig. 1 is a schematic structural diagram of the low-frequency noise reduction and silencing sheet, wherein 1 is a silencing sheet framework, 2 is a silencing orifice plate, 3 is a glass fiber protective layer, 4 is a glass wool composite sound absorption layer, and 5 is a low-frequency noise reduction partition plate.
Detailed Description
In order to more clearly illustrate the technical effects of the present invention and facilitate the implementation, the present invention provides the following embodiments:
example 1: the low-frequency noise reduction and silencing sheet mainly comprises a silencing sheet framework, a silencing pore plate, a glass fiber protective layer, a glass wool composite sound absorption layer and a low-frequency noise reduction partition plate, wherein the silencing pore plate is filled with the glass wool composite sound absorption layer and externally coated with the glass fiber protective layer, the low-frequency noise reduction partition plate is arranged in the middle of the low-frequency noise reduction and silencing sheet, and the low-frequency noise reduction partition plate and the silencing sheet framework and other structures are not rigidly connected.
The noise elimination effect is related to the sound absorption coefficient of the centrifugal glass wool, and is different due to different volume weights and thicknesses of the glass wool. The low-frequency noise reduction is realized by adopting the large thickness and high volume weight of the glass wool and adopting 32-48Kg/m composite centrifugal glass wool to realize the complementary performance of the sound absorption coefficient. The volume weight of the outer layer is small, the volume weight of the inner layer is large, the center plane of the silencing sheet is designed to be a clapboard, the specific gravity of the clapboard is higher than that of a glass product, the thickness and specific gravity of the clapboard are also designed according to the frequency spectrum characteristics, and the clapboard is called as a low-frequency noise reduction clapboard. The low-frequency noise reduction partition board is divided into a flat board and a micro-porous board and is designed and selected according to the noise spectrum characteristic. The inner layer and the outer layer of glass wool are flexibly proportioned according to the noise spectrum condition, and when the sound absorption layer is the same in thickness, the larger the low frequency is, the larger the volume-weighted sound absorption coefficient is. The lower the noise peak frequency, the greater the specific gravity and thickness of the separator. The noise passes through the two sound absorption layers and gradually consumes energy, when sound waves reach the low-frequency noise reduction partition plate, resonance energy consumption can be generated, and part of the sound waves can be reflected to enter the composite sound absorption layer again to realize noise elimination again. The low-frequency noise reduction partition plate is a free body in the center of the glass wool, and is not rigidly connected with structures such as a silencing sheet framework and the like, so that free resonance and resistance silencing of the low-frequency noise reduction partition plate are realized. The centrifugal glass wool is hydrophobic, moisture-proof, waterproof and corrosion-resistant; the framework and the sound absorption pore plate are made of galvanized materials, stainless steel, aluminum plates and the like, and further spray coating anti-corrosion treatment is carried out in special environment, so that the service life of the product is ensured.
The product performance is as follows: the low-frequency noise elimination effect is good, the weight is light, the structure is compact, the strength is firm, the modular design is realized, and the installation is simple and convenient. Corrosion resistance and aging resistance. The product structure is as follows: the sound absorption pore plate made of various materials can be adopted on the two sides, the application range is wide, and the sound absorption pore plate is an alkali-free glass fiber protective layer, a 32K glass wool sound absorption layer, a 48K glass wool sound absorption layer, a low-frequency noise reduction partition plate, a metal U-shaped frame and the like. The structure is detailed as follows: 1) the U-shaped frame of the silencing template is formed by mechanical rolling, so that the defects that the section bar is deformed due to uneven stress and stress effect in the common forming process of the plate are overcome. And simultaneously, the strength of the section is increased. 2) The sound absorption hole plate is 0.5-2.0mm thick and is formed by numerical control punching of various plates, the hole diameter of the hole plate is 3-5mm, and regular triangles with the hole centers being 6-10mm are uniformly distributed. In order to solve the best combination of the strength and the sound absorption effect of the pore plate, the pore plate is formed into reinforcing ribs with the width of 20mm and the depth of 0.5mm by compression. 3) The sound absorption plate is filled with glass wool sound absorption materials with different volume weights, and the glass wool sound absorption materials are externally coated with glass fiber cloth to provide good protection for the sound absorption materials. 4) The double-layer pore plates on the two sides and the U-shaped frame are riveted or welded according to different use conditions, so that the appearance and the firmness are ensured. Product size: the thickness of the low-frequency noise reduction and elimination sheet is designed according to the characteristics of low-frequency noise: the noise elimination device has the advantages that the noise elimination effect and the resistance loss are reasonable due to the difference of 120mm/160mm/200mm/240mm/300mm, and the length and the width are designed according to specific conditions.
Claims (9)
1. The low-frequency noise reduction and silencing sheet is characterized by mainly comprising a silencing sheet framework, a silencing pore plate, a glass fiber protective layer, a glass wool sound absorption layer and a low-frequency noise reduction partition plate, wherein the silencing pore plate is filled with the composite glass wool sound absorption layer and coated with the glass fiber protective layer, the low-frequency noise reduction partition plate is arranged in the middle of the low-frequency noise reduction and silencing sheet, and the low-frequency noise reduction partition plate is not rigidly connected with the silencing sheet framework and other structures.
2. The low-frequency noise reduction and silencing sheet as claimed in claim 1, wherein the framework of the silencing sheet is a metal U-shaped framework.
3. The low-frequency noise reduction and silencing sheet of claim 1 or 2, wherein the silencing orifice plate is riveted or welded with the framework of the silencing sheet.
4. The low-frequency noise reduction and sound absorption sheet as claimed in claim 1 or 2, wherein the sound absorption layer is prepared from 32-48Kg/m by carrying out composite centrifugal glass wool.
5. The low frequency noise reduction and noise reduction sheet according to claim 1 or 2, wherein said low frequency noise reduction partition plate is divided into a flat plate and a micro-perforated plate.
6. The low-frequency noise reduction and silencing sheet as claimed in claim 1 or 2, wherein the framework of the silencing sheet is formed by mechanical rolling.
7. The low-frequency noise-reducing and silencing sheet as claimed in claim 1 or 2, wherein the silencing holes are 0.5-2.0mm thick, the hole diameters of the holes are 3-5mm, and regular triangles with the hole centers being 6-10mm are uniformly distributed.
8. The low frequency noise reduction and noise reduction sheet of claim 7, wherein the noise reduction orifice plate is profiled to form reinforcing ribs 20mm wide and 0.5mm deep.
9. The low-frequency noise reduction and noise elimination sheet according to claim 1 or 2, wherein the thickness of the low-frequency noise reduction and noise elimination sheet is designed according to the characteristics of low-frequency noise: 120mm/160mm/200mm/240mm/300 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010801990.4A CN111862922A (en) | 2020-08-11 | 2020-08-11 | Low-frequency noise reduction and silencing sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010801990.4A CN111862922A (en) | 2020-08-11 | 2020-08-11 | Low-frequency noise reduction and silencing sheet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111862922A true CN111862922A (en) | 2020-10-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010801990.4A Pending CN111862922A (en) | 2020-08-11 | 2020-08-11 | Low-frequency noise reduction and silencing sheet |
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| Country | Link |
|---|---|
| CN (1) | CN111862922A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203573642U (en) * | 2013-11-08 | 2014-04-30 | 广州电力设计院 | Sound absorption structure |
| CN104167203A (en) * | 2014-08-07 | 2014-11-26 | 四川正升声学科技有限公司 | Broadband sheet type silencer |
-
2020
- 2020-08-11 CN CN202010801990.4A patent/CN111862922A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203573642U (en) * | 2013-11-08 | 2014-04-30 | 广州电力设计院 | Sound absorption structure |
| CN104167203A (en) * | 2014-08-07 | 2014-11-26 | 四川正升声学科技有限公司 | Broadband sheet type silencer |
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