CN213061762U - Microporous composite full-frequency sound absorption screen body - Google Patents
Microporous composite full-frequency sound absorption screen body Download PDFInfo
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- CN213061762U CN213061762U CN202021334671.9U CN202021334671U CN213061762U CN 213061762 U CN213061762 U CN 213061762U CN 202021334671 U CN202021334671 U CN 202021334671U CN 213061762 U CN213061762 U CN 213061762U
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Abstract
The utility model discloses a compound full-frequency sound-absorbing screen body of micropore, including reflection noise elimination box and sound insulation backplate (4), reflection noise elimination box fixed connection in front end in sound insulation backplate (4), reflection noise elimination box with form a cavity between sound insulation backplate (4), reflection noise elimination box includes sound absorption panel (1), fossil fragments bearing structure (2) and baffle (3), sound absorption panel (1) and baffle (3) respectively with fossil fragments bearing structure (2) terminal surface fixed connection around, it is provided with a plurality of holes to run through between the front and back terminal surface of sound absorption panel (1). The utility model discloses possess simultaneously the sound absorption of three kinds of different forms of micropore resonance sound absorption, sheet metal resonance sound absorption, porous fiber sound absorption, possess simultaneously low, well, high sound absorption effect who covers the full frequency channel of audible sound.
Description
Technical Field
The utility model belongs to the technical field of the sound barrier structure, be a compound full-frequency sound absorption screen body of micropore particularly.
Background
The sound absorption screen bodies adopted by the highway sound barrier at the present stage comprise an aluminum alloy screen body filled with glass wool, an aluminum alloy screen body filled with polyurethane sound absorption wool, a glass fiber reinforced plastic screen body filled with glass wool, a honeycomb aluminum sound absorption screen body, an FC cement board filled with polyurethane sound absorption wool, a foamed aluminum sound absorption screen body, an Qrd ultramicropore sound absorption screen body and the like. The sound absorbing screen bodies can be roughly divided into two types in principle: porous sound absorption and helmholtz resonance sound absorption. The sound absorption screen body that adopts at present is mostly porous sound absorbing structure, and the screen body is constituteed to ordinary perforation panel + porous sound absorbing material + cavity + backplate, and ordinary porous sound absorbing material adopts organic matter foaming or wire drawing to make more, and life is not long, and metal foaming sound absorbing material cost is higher, and sound absorption screen body cavity degree of depth is less at present stage in addition, and structural sound absorption performance is relatively poor, can absorb sound frequency narrower, and the suitability is not good.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a compound full frequency sound absorption screen body of micropore, it all has better absorption effect to full frequency sound (including low frequency, intermediate frequency, high frequency band).
In order to realize the purpose, the utility model discloses a technical scheme as follows:
a microporous composite full-frequency sound absorption screen body comprises a reflection sound absorption box and a sound insulation back plate, wherein the reflection sound absorption box is fixedly connected with the front end in the sound insulation back plate, a cavity is formed between the reflection sound absorption box and the sound insulation back plate,
the reflection sound-absorbing box comprises a sound-absorbing panel, a keel supporting structure and a partition plate, wherein the sound-absorbing panel and the partition plate are fixedly connected with the front end face and the rear end face of the keel supporting structure respectively, and a plurality of holes are formed in the front end face and the rear end face of the sound-absorbing panel in a penetrating mode.
Further, the sound absorption panel is disposed in parallel with the partition.
Furthermore, a plurality of holes penetrate through the front end face and the rear end face of the keel supporting structure.
Further, the holes of the keel supporting structure are square holes or regular hexagonal holes.
Furthermore, the keel supporting structure is made of polyester fiber materials, and the cross section of the keel supporting structure is of a regular polygon structure or a wave-shaped structure.
Furthermore, the sound absorption panel and the partition plate are respectively and fixedly connected with the front end face and the rear end face of the keel supporting structure through glue.
Further, the reflection sound-absorbing box is connected to the front end in the sound-absorbing back plate in a rivet-free sealing mode.
Furthermore, the sound absorption panel is an aluminum plate or a steel plate, the aperture of a hole penetrating through the sound absorption panel is 0.3-0.5mm, the perforation rate is 1% -3%, and the keel supporting structure is matched with the sound absorption panel in size and specification and corresponds to the sound absorption panel in position up and down.
Further, the clapboard is a glass fiber board, a polyester fiber board, a rock wool fiber board, an aramid fiber board or an aluminum fiber board, and the fiber density of the clapboard is 80-200Kg/m3。
Furthermore, the sound insulation back plate is a galvanized steel plate, is bent mechanically into a concave shape, and has a thickness of 1.0mm-1.5 mm.
Compared with the prior art, the utility model, it is showing the advantage and lies in:
(1) after the sound absorption panel is perforated, the sound absorption panel and a cavity divided by the middle keel supporting structure form a plurality of Helmholtz resonators to form a combination of a micropore resonance sound absorption structure and a thin plate resonance sound absorption structure, and the sound absorption panel has better sound absorption performance for low-frequency sound independently;
(2) the partition board is a high-density fiberboard, belongs to porous fiber sound-absorbing materials, has good sound-absorbing capacity for medium-frequency and high-frequency sounds, and a large cavity is formed between the partition board and the sound-insulating back board, so that the sound-absorbing capacity can be further improved;
(3) the utility model discloses possess simultaneously the sound absorption of three kinds of different forms of micropore resonance sound absorption, sheet metal resonance sound absorption, porous fiber sound absorption, possess simultaneously low, well, high sound absorption effect who covers the full frequency channel of audible sound.
Drawings
Fig. 1 is a vertical view of the microporous composite full-frequency sound-absorbing screen of the present invention.
Fig. 2 is a schematic view of the sound absorption panel of the microporous composite full-frequency sound absorption screen body of the present invention.
Fig. 3 is a schematic structural view of the keel supporting structure of the microporous composite full-frequency sound-absorbing screen body of the present invention.
Reference numbers in the figures: 1. a sound absorbing panel; 2. a keel support structure; 3. a partition plate; 4. a sound insulation backboard.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1:
referring to fig. 1-3, a microporous composite full-frequency sound-absorbing screen comprises a reflective sound-absorbing box and a sound-insulating back plate 4, wherein the reflective sound-absorbing box is fixedly connected to the front end of the sound-insulating back plate 4, a cavity is formed between the reflective sound-absorbing box and the sound-insulating back plate 4,
the reflection noise elimination box comprises a sound absorption panel 1, a keel supporting structure 2 and a partition plate 3, wherein the sound absorption panel 1 and the partition plate 3 are fixedly connected with the front end face and the rear end face of the keel supporting structure 2 respectively, and a plurality of holes are formed in the front end face and the rear end face of the sound absorption panel 1 in a penetrating mode.
A manufacturing method of a microporous composite full-frequency sound absorption screen body comprises the following steps:
(1) manufacturing the sound absorption panel 1: taking an aluminum alloy plate with the thickness of 0.7mm, and punching the aluminum alloy plate by using machinery, wherein small holes with the diameter of 0.3-0.5mm penetrate through the surface, and the hole spacing is 3.5-5.5 mm;
(2) and (3) manufacturing a keel supporting structure 2: taking a 20-40mm polyester fiber material, and forming a plurality of square holes penetrating through a plate body on the surface of the polyester fiber material by utilizing a mechanical stamping technology, wherein the side length is 20-40mm, and the hole interval is 5-10 mm;
(3) manufacturing a partition plate 3: taking a hot-melt fiber board, cutting into 496mm wide, 1960mm long and 10-15mm thick;
(4) and (3) manufacturing a sound insulation back plate 4: taking a galvanized steel plate, and mechanically bending the galvanized steel plate into a concave shape;
(5) manufacturing a reflection silencing box: placing the keel supporting structure 2 between the sound absorption panel 1 and the partition plate 3, and adhering the keel supporting structure and the partition plate by using glue to manufacture a reflection sound-absorbing box;
(6) manufacturing the sound absorption screen body: and riveting the bent sound insulation backboard 4 and the reflection sound-deadening box through a rivet-free connection technology.
Measuring the sound absorption coefficient of the sample by using a standing wave tube method, wherein the size of a single block is measured to be 98mm by 98 mm; the installation conditions are as follows: the cavity is 100mm (solid), the parameters of the sound absorption screen body are shown in table 1, and the sound absorption test effect is shown in table 2.
TABLE 1 microporous composite full-frequency sound-absorbing screen body parameter table
In the above table, the panel represents the sound absorbing panel 1, the partition represents the partition 3, the backboard represents the sound insulating backboard 4, and the distance between the panel and the partition represents the thickness of the keel support structure 2.
TABLE 2 sound absorption test effect table for microporous composite full-frequency sound absorption screen body
Example 2:
a microporous composite full-frequency sound absorption screen body comprises a reflection sound absorption box and a sound insulation back plate 4, wherein the reflection sound absorption box is fixedly connected with the front end in the sound insulation back plate 4, a cavity is formed between the reflection sound absorption box and the sound insulation back plate 4,
the reflection noise elimination box comprises a sound absorption panel 1, a keel supporting structure 2 and a partition plate 3, wherein the sound absorption panel 1 and the partition plate 3 are fixedly connected with the front end face and the rear end face of the keel supporting structure 2 respectively, and a plurality of holes are formed in the front end face and the rear end face of the sound absorption panel 1 in a penetrating mode.
A manufacturing method of a microporous composite full-frequency sound absorption screen body comprises the following steps:
(1) manufacturing the sound absorption panel 1: taking an aluminum alloy plate with the thickness of 0.7mm, and punching the aluminum alloy plate by using machinery, wherein small holes with the diameter of 0.3-0.5mm penetrate through the surface, and the hole spacing is 3.5-5.5 mm;
(2) and (2) manufacturing a keel supporting structure 2: taking a glass fiber material with the thickness of 20-40mm, and forming a plurality of regular hexagons penetrating through the plate body on the surface of the glass fiber material by utilizing a mechanical stamping technology, wherein the side length is 20-40mm, and the hole interval is 5-10 mm;
(3) manufacturing a partition plate 3: cutting a piece of glass fiber into 496mm wide, 1960mm long and 10-15mm thick;
(4) and (3) manufacturing a sound insulation back plate 4: taking a galvanized steel plate, and mechanically bending the galvanized steel plate into a concave shape;
(5) manufacturing a reflection silencing box: placing the keel supporting structure 2 between the sound absorption panel 1 and the partition plate 3, and adhering the keel supporting structure and the partition plate by using glue to manufacture a reflection sound-absorbing box;
(6) manufacturing the sound absorption screen body: and riveting the bent sound insulation backboard 4 and the reflection sound-deadening box through a rivet-free connection technology.
Measuring the sound absorption coefficient of the sample by using a standing wave tube method, wherein the size of a single block is measured to be 98mm by 98 mm; the installation conditions are as follows: the cavity is 100mm (solid), the parameters of the sound absorption screen body are shown in table 3, and the sound absorption test effect is shown in table 4.
TABLE 3 microporous composite full-frequency sound-absorbing screen body parameter table
In the above table, the panel represents the sound absorbing panel 1, the partition represents the partition 3, the backboard represents the sound insulating backboard 4, and the distance between the panel and the partition represents the thickness of the keel support structure 2.
TABLE 4 the utility model discloses compound full range sound absorption screen body sound absorption test effect table of micropore
| Sound absorption screen body | Coefficient of NRC | 250hz | 500hz | 1000hz | 2000hz |
| I | 0.82 | 0.798 | 0.826 | 0.843 | 0.799 |
| II | 0.84 | 0.822 | 0.846 | 0.866 | 0.831 |
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. The microporous composite full-frequency sound absorption screen body is characterized by comprising a reflection sound absorption box and a sound insulation back plate (4), wherein the reflection sound absorption box is fixedly connected to the front end in the sound insulation back plate (4), a cavity is formed between the reflection sound absorption box and the sound insulation back plate (4),
the reflection sound-absorbing box comprises a sound-absorbing panel (1), a keel supporting structure (2) and a partition plate (3), wherein the sound-absorbing panel (1) and the partition plate (3) are respectively fixedly connected with the front end face and the rear end face of the keel supporting structure (2), and a plurality of holes are formed in the front end face and the rear end face of the sound-absorbing panel (1) in a penetrating mode.
2. A microporous composite full-frequency sound-absorbing screen according to claim 1, wherein the sound-absorbing panel (1) is arranged in parallel with the partition (3).
3. The microporous composite full-frequency sound-absorbing screen body according to claim 1, wherein a plurality of holes are formed between the front and rear end surfaces of the keel supporting structure (2).
4. The microporous composite full-frequency sound-absorbing screen body according to claim 3, wherein the holes of the keel supporting structure (2) are square holes or regular hexagonal holes.
5. The microporous composite full-frequency sound-absorbing screen body according to claim 3, wherein the keel supporting structure (2) is made of polyester fiber material.
6. A microporous composite full-frequency sound-absorbing screen body according to any one of claims 1 to 5, wherein the sound-absorbing panel (1) and the partition plate (3) are fixedly connected with the front and rear end faces of the keel supporting structure (2) through glue.
7. A microporous composite full-frequency sound-absorbing screen body according to any one of claims 1 to 5, wherein the reflection sound-absorbing box is connected to the front end in the sound-insulating backboard (4) in a rivet-free sealing manner.
8. A microporous composite full-frequency sound-absorbing screen according to any one of claims 1 to 5, wherein the sound-absorbing panel (1) is an aluminum plate or a steel plate, the diameter of the holes penetrating through the sound-absorbing panel is 0.3-0.5mm, and the perforation rate is 1% -3%.
9. The microporous composite full-frequency sound-absorbing screen body according to claim 8, wherein the separator (3) is a glass fiber board, a polyester fiber board, a rock wool fiber board, an aramid fiber board or an aluminum fiber board, and the fiber density of the separator (3) is 80-200Kg/m3。
10. The microporous composite full-frequency sound-absorbing screen body as claimed in claim 9, wherein the sound-insulating back plate (4) is a galvanized steel plate, is concave through mechanical bending, and has a thickness of 1.0mm-1.5 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021334671.9U CN213061762U (en) | 2020-07-09 | 2020-07-09 | Microporous composite full-frequency sound absorption screen body |
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| CN202021334671.9U CN213061762U (en) | 2020-07-09 | 2020-07-09 | Microporous composite full-frequency sound absorption screen body |
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| CN213061762U true CN213061762U (en) | 2021-04-27 |
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