CN202835696U - Wide band sound absorption wind pipe and air inlet - Google Patents
Wide band sound absorption wind pipe and air inlet Download PDFInfo
- Publication number
- CN202835696U CN202835696U CN 201220444139 CN201220444139U CN202835696U CN 202835696 U CN202835696 U CN 202835696U CN 201220444139 CN201220444139 CN 201220444139 CN 201220444139 U CN201220444139 U CN 201220444139U CN 202835696 U CN202835696 U CN 202835696U
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- tube wall
- sound
- sound absorption
- perforated plate
- airduct
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Abstract
The utility model relates to a wide band sound absorption wind pipe and an air inlet. A wide band sound absorption wind pipe and an air inlet are mainly used for ventilating in acoustics rooms which include medium, large anechoic rooms and the like. A wind pipe is on the top and connected with an air conditioning system. An air inlet is at the bottom and communicated with an acoustics room. The wind pipe is composed of a front pipe wall and a back pipe, wherein the front pipe wall is a double-layer metal perforated plate and filled with sound absorption materials through entrant sound airtight thin films and the back pipe wall is a metal perforated plate, a resonance plate and elastic materials in sequence. An elastic cushion is arranged between the metal perforated plate and the resonance plate. The air inlet is composed of a slope diversion metal perforated plate, sound absorption materials and a shutter air inlet. The sound absorption materials are arranged at the back of the slope diversion metal perforated plate which is opposite to the shutter air inlet in the front. The wind pipe and the air inlet can be fixed at corners in acoustics rooms. The front pipe wall is provided with good medium-high frequency sound absorption characteristics and the back pipe wall is provided with good low frequency sound absorption characteristics so as to have effects in flowing slowly and reducing regenerative noises and satisfy the needs of anechoic rooms free fields and background noise under the conditions of high-speed large air quantities.
Description
Technical field
The utility model relates to a kind of ventilation unit, especially a kind of Low-Noise Broad-Band sound absorption airduct and air port for the acoustics ventilation of room.
Background technology
The acoustics rooms such as medium-sized or large-scale anechoic room are widely used in the fields such as vehicle complete vehicle and parts, motor-car car load and parts, aircraft engine and parts, black and white domestic appliances, various industrial electrical equipment and equipment for building, human body hearing and philological test and research, product quality testing agency.These acoustics rooms require the sound more than the cut-off frequency is reached 99.9% absorption, and require background noise to reach below 20 decibels.For this reason, need to have one can not reflect sound, can not produce again the ventilation unit of noise, enter the acoustics room to stop external environmental noise and fan noise by airduct.Noise is a minute frequency, and the more low more difficult elimination of frequency.
In anechoic room during measurement products, the measured object of running or standard source meeting and sounding, the effect of anechoic room are exactly not allow the ground of wall, roof and even whole elimination room reflect in the face of sound produces, and ventilating system exposes, its inner meeting produces ventilation noise, and outside can the generation reflected.
Often need the temperature that keeps certain in the acoustics room, can in the acoustics room, send into the natural wind with certain pressure by blower fan under the general room temperature condition, summer, winter then need be sent into respectively hot and cold wind, allow the fresh air with uniform temperature discharge after the circulation in the acoustics room under the effect of blower fan.Especially with the anechoic room of operating mode, need to use the larger blower fan of air output, and also larger air-conditioning of configuration refrigerating capacity, to realize fast-refrigerating or intensification in the anechoic room, make anechoic room reach fast experiment condition.Measured object can produce the situation of larger heat in running into anechoic room, then needs as early as possible heat to be discharged.The pneumatic noise that the running noise of blower fan and wind speed produce all can be imported in the anechoic room by ventilation unit.Although the sound-absorbing material in the vent passages can absorption of noise, but the long or sound-absorbing material of sound absorption passage too much not only can cause windage, thereby reducing wind speed and air quantity cause affecting the effect of ventilation, also can make the noise elimination structure complicated, waste installing space and raising cost.
Ventilation denoising device in the past only is to add silencer in the ventilation shaft of outside, acoustics room, and in the ventilation shaft of acoustics house interior by the further adding sound-absorbing material of blocking of perforated metal panel, then at the air outlet of ventilation shaft a blinds shape air port to be installed, to reach the purpose of attractive in appearance, noise reduction and wind-guiding.The defective of this tradition ventilation denoising device is that outer tube wall is shiny surface, and noise is had reflex, and internal structure is confined to medium-high frequency to the absorption of noise, and is relatively poor to the absorption of low-frequency noise.Also because the BOD corresponding with air grille is the right angle, wind is formed resistance, be unfavorable for the diffusion to the acoustics room in the airduct of new wind.
The utility model content
The purpose of this utility model is: for the acoustics room provides a kind of ventilation shaft and air port, make the wind pipeline outer surface not have sound reflection, reach the absorption to medium-high frequency especially low-frequency noise, and have good wind-guiding effect.
Technical solution adopted in the utility model is: a kind of broadband sound absorption airduct and air port, comprise front tube wall, rear tube wall and air grille 1, front tube wall and rear tube wall form airduct, and an end of airduct links to each other with ventilation silencer, and the other end of airduct communicates with the acoustics room after air grille is installed.Front tube wall is formed by connecting by skeleton by double-level-metal perforated plate 2, between the double-level-metal perforated plate for cavity and be filled with sound-absorbing material 3.Rear tube wall is made of single-layer metal perforated plate 4, sounding board 5, cushion 6, elastomeric material 7 and film 8, sounding board 5 is located between elastomeric material 7 and the single-layer metal perforated plate 4, cushion 6 for strip and be arranged on sounding board 5 and single-layer metal perforated plate 4 between the surrounding, film 8 is attached to the rear surface of elastomeric material 7, and rear tube wall is made into L-type.Front tube wall and rear tube wall connect as one by fixture, and the angle, room that is fixed on the acoustics room behind the air grille 1 at one end is installed.
The oblique water conservancy diversion sound-absorbing panel for metal perforation 10 that is equipped with on the rear tube wall corresponding with air grille 1 in the airduct, the following of this water conservancy diversion sound-absorbing panel for metal perforation is sound-absorbing material 3, sound-absorbing material is stratiform, thickness is 50-200mm, or all fills up the triangular space that water conservancy diversion sound-absorbing panel for metal perforation 10 and rear tube wall surround.
The inner surface of tube wall double-level-metal perforated plate is bonded with the airtight film 11 of entrant sound.
The beneficial effects of the utility model are:
1, the wind pipeline outer surface does not have the noise reflection: because the front tube wall that is exposed in the acoustics room adopts the double-level-metal perforated acoustic board, be filled with sound-absorbing material through the airtight film of double-deck entrant sound again, so that can passing perforation and the film of metallic plate, the inside and outside sound of wind pipeline absorbed by sound-absorbing material, and don't cold and hot air is scattered and disappeared at tube wall, the sound that is conducive in the cold-hot wind is fully absorbed after the distance through one section airduct, satisfies the free field requirement.
2, low frequency absorption characteristic audio frequency range good, that absorb is wide: because rear tube wall has adopted the low-frequency sound-absorbing structure that is made of sounding board, elastomeric material and cushion, so that low-frequency noise can be absorbed, reduced the regenerated noise in the ventilation shaft, the background noise in acoustics room is further reduced.
3, have good wind guiding and sound absorption: owing in the position, opposite in air port inclined-plane water conservancy diversion sound-absorbing panel for metal perforation being housed, make wind both diversed to the air port, form unhurried current, reduced windage, general's sound is wherein absorbed by the sound-absorbing material of inside through the perforation of metallic plate again.
Description of drawings
Fig. 1 is the utility model facade view.
Fig. 2 is the A-A cutaway view of Fig. 1.
The specific embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present utility model is described in further detail.
Such as Fig. 1, shown in Figure 2, a kind of broadband sound absorption airduct and air port, comprise front tube wall, rear tube wall and air grille 1, front tube wall and rear tube wall form airduct, the height of airduct is with identical as the anechoic room in acoustics room, in four corners of anechoic room 2 air intake airducts and 2 air draft airducts are installed respectively, wherein the upper end of air intake airduct with pass into air-conditioning system after ventilation silencer links to each other, the other end of air intake airduct is installed and is arranged on the bottom of anechoic room behind the air grille and communicates with anechoic room, one end of air draft airduct communicates with anechoic room after air grille is installed, communicate with the room atmosphere of air-conditioning system or factory building after the other end fixes a silencer, wherein silencer is for reducing the noise in the wind pipeline.
Tube wall is formed by connecting by skeleton by double-level-metal perforated plate 2 before the airduct, the material of perforated metal panel is steel plate, thickness is 1mm, punching rate is greater than 25%, aperture 2mm, the centre is the thick skeleton of 50mm, front-back weld metal aperture board, be cavity and be filled with the thick environmental protection mineral wool of 50mm sound-absorbing material 3 between the double-level-metal perforated plate, front tube wall forms two antethecas of huge tubulose airduct.
Rear tube wall is made of single-layer metal perforated plate 4, sounding board 5, cushion 6, elastomeric material 7 and film 8.Wherein, the single-layer metal perforated plate also is the 1mm steel plate, sounding board 5 is five-layer plywood or 7 clamping plate, and cushion 6 is the rubber batten, and elastomeric material 7 is tabular porous sponge, film 8 is plastic sheeting, sounding board 5 is located between elastomeric material 7 and the single-layer metal perforated plate 4, cushion 6 for strip and be arranged on sounding board 5 and single-layer metal perforated plate 4 between the surrounding, film 8 is attached to the rear surface of elastomeric material 7, rear tube wall is divided into two and be assembled into L-type, forms two rear walls of airduct.The effect of cushion 6 is that sounding board 5 is directly contacted with single-layer metal perforated plate 4, guarantees that sounding board has identical frequency with noise, by the resonance acquisition noise reduction of sounding board and noise.
Front tube wall and the rear tube wall of airduct connect as one by screw and fixture, and air grille 1 is installed below.Airduct can also be horizontally installed in the angle, horizontal room below the anechoic room roof, and is that an end connects air-conditioning by silencer equally, and the other end communicates with anechoic room by the air port.
As shown in Figure 2, the oblique water conservancy diversion sound-absorbing panel for metal perforation 10 that is equipped with on the rear tube wall corresponding with air grille 1 in airduct, the following of this water conservancy diversion sound-absorbing panel for metal perforation is sound-absorbing material 3, sound-absorbing material is stratiform, thickness is 50-200mm, or one deck all fills up the triangular space that water conservancy diversion sound-absorbing panel for metal perforation 9 and rear tube wall surround, and this embodiment adopts the thick environmental protection mineral wool of 100mm, and the back of mineral wool is cavity.Its objective is that the wind for having certain speed carries out water conservancy diversion, with its air grille that directly leads, can not produce regenerated noise because of the bottom surface that wind speed directly impacts airduct.
As shown in Figure 1, the inner surface of tube wall double-level-metal perforated plate is bonded with the airtight film 11 of entrant sound.The purpose of entrant sound is to allow the interior sound-absorbing material of front tube wall absorb the interior noise of anechoic room, prevent that tube wall from reflecting the formation of noise in the anechoic room, air-locked purpose is to make the cold and hot air in the airduct be directed into air grille always, and noise is absorbed by the sound-absorbing material in the airduct as much as possible.
As shown in Figure 1, the exterior angle of front tube wall is right angle or arc, and is comparatively attractive in appearance at certain occasion arc lower.
Broadband sound absorption airduct and air port according to this scheme manufacturing, because front tube wall is the medium-high frequency sound absorption structure, rear tube wall is the low-frequency resonance sound absorption structure, inside, air port is equipped with inclined-plane water conservancy diversion sound-absorbing material, make the sound sucting band of this ventilation unit wider, the sound reflection ability of outer surface is more weak, and the background noise index in the acoustics room such as anechoic room is lower.When especially in airduct, passing to high velocity air, can not affect the acoustics index of the interior free field of anechoic room and background noise.
Claims (5)
1. broadband sound absorption airduct and air port, comprise front tube wall, rear tube wall and air grille (1), front tube wall and rear tube wall form airduct, one end of airduct links to each other with ventilation silencer, the other end of airduct communicates with the acoustics room after air grille is installed, it is characterized in that: described front tube wall is formed by connecting by skeleton by double-level-metal perforated plate (2), is cavity and be filled with sound-absorbing material (3) between the double-level-metal perforated plate; Described rear tube wall is made of single-layer metal perforated plate (4), sounding board (5), cushion (6), elastomeric material (7) and film (8), sounding board (5) is located between elastomeric material (7) and the single-layer metal perforated plate (4), cushion (6) for strip and be arranged on sounding board (5) and single-layer metal perforated plate (4) between the surrounding, film (8) is attached to the rear surface of elastomeric material (7), and rear tube wall is made into L-type; Front tube wall and rear tube wall connect as one by fixture, and at one end air grille are installed and are fixed on after (1) angle, room in acoustics room.
2. broadband according to claim 1 sound absorption airduct and air port, it is characterized in that: described sounding board (5) is divided into polylith in short transverse, and the place, slit between per two is supported by a skeleton (9) respectively.
3. broadband according to claim 1 sound absorption airduct and air port, it is characterized in that: the oblique water conservancy diversion sound-absorbing panel for metal perforation (10) that is equipped with on the interior rear tube wall corresponding with air grille (1) of airduct, the following of this water conservancy diversion sound-absorbing panel for metal perforation is sound-absorbing material (3), sound-absorbing material is stratiform, thickness is 50-200mm, or all fills up the triangular space that water conservancy diversion sound-absorbing panel for metal perforation (9) and rear tube wall surround.
4. broadband according to claim 1 sound absorption airduct and air port, it is characterized in that: the inner surface of described front tube wall double-level-metal perforated plate is bonded with the airtight film of entrant sound (11).
5. broadband according to claim 1 sound absorption airduct and air port, it is characterized in that: the exterior angle of described front tube wall is right angle or arc.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220444139 CN202835696U (en) | 2012-09-03 | 2012-09-03 | Wide band sound absorption wind pipe and air inlet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220444139 CN202835696U (en) | 2012-09-03 | 2012-09-03 | Wide band sound absorption wind pipe and air inlet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202835696U true CN202835696U (en) | 2013-03-27 |
Family
ID=47947389
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220444139 Withdrawn - After Issue CN202835696U (en) | 2012-09-03 | 2012-09-03 | Wide band sound absorption wind pipe and air inlet |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202835696U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102853515A (en) * | 2012-09-03 | 2013-01-02 | 北京科奥克声学技术有限公司 | Broadband sound absorption air tube and air opening |
| CN106257124A (en) * | 2015-06-18 | 2016-12-28 | 镇江市中能机械设备有限公司 | pipeline silencing method |
| ITUA20164322A1 (en) * | 2016-06-13 | 2017-12-13 | Sts Isolamenti S R L | SILENT VENTILATION DUCT |
| CN108074560A (en) * | 2018-01-22 | 2018-05-25 | 深圳可朗声科技有限公司 | Sound absorber and its noise reduction furniture in a kind of broadband room |
-
2012
- 2012-09-03 CN CN 201220444139 patent/CN202835696U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102853515A (en) * | 2012-09-03 | 2013-01-02 | 北京科奥克声学技术有限公司 | Broadband sound absorption air tube and air opening |
| CN102853515B (en) * | 2012-09-03 | 2014-11-05 | 北京科奥克声学技术有限公司 | Broadband sound absorption air tube and air opening |
| CN106257124A (en) * | 2015-06-18 | 2016-12-28 | 镇江市中能机械设备有限公司 | pipeline silencing method |
| ITUA20164322A1 (en) * | 2016-06-13 | 2017-12-13 | Sts Isolamenti S R L | SILENT VENTILATION DUCT |
| CN108074560A (en) * | 2018-01-22 | 2018-05-25 | 深圳可朗声科技有限公司 | Sound absorber and its noise reduction furniture in a kind of broadband room |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130327 Effective date of abandoning: 20141105 |
|
| RGAV | Abandon patent right to avoid regrant |