CN205877574U - Take active noise reduction's air pipe device - Google Patents
Take active noise reduction's air pipe device Download PDFInfo
- Publication number
- CN205877574U CN205877574U CN201620491548.5U CN201620491548U CN205877574U CN 205877574 U CN205877574 U CN 205877574U CN 201620491548 U CN201620491548 U CN 201620491548U CN 205877574 U CN205877574 U CN 205877574U
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- Prior art keywords
- noise
- layer pipe
- noise reduction
- pipeline
- ventilation shaft
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- Soundproofing, Sound Blocking, And Sound Damping (AREA)
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Abstract
The utility model provides a take active noise reduction's air pipe device, include noise space side air pipe and fall the space side air pipe that makes an uproar, noise space side air pipe with fall the space side air pipe that makes an uproar and communicate each other, fall the space side air pipe that makes an uproar and adopt the double skin duct, the inlayer pipeline and the outer layer pipeline that are mutual suit respectively do, form between inlayer pipeline and outer layer pipeline are and lead to dissection of the wind, edge or at least one noise sensor of internally mounted of noise space side air pipe, inlayer pipeline internally mounted has the dynamic loudspeaker, noise sensor and dynamic loudspeaker are connected respectively on the noise -reduction controling circuit, the noise signal who follows noise sensor and send here is received to the noise -reduction controling circuit, noise -reduction controling circuit drive dynamic loudspeaker. Because the secondary sound source sound wave plane of sending is parallel with the sound wave plane of noise, therefore can obtain good broadband noise inhibitory effect, air current flow hole division is near the noise cancellation cross -section for can obtain obvious noise inhibitory effect when guaranteeing the air volume again.
Description
Technical field
The open a kind of ventilating duct device of this utility model, the ventilating duct device of a kind of band active noise reduction and fall
Method for de-noising, belongs to technical field of acoustics.
Background technology
Ventilation shaft is the ventilation unit that modern architecture is conventional.In order to be able to allow interior of building get fresh air, logical
The one end open of wind pipeline typically requires the spatial noise being opened in outside building.How in the ventilation ensureing that acquisition is enough
While, can be effectively reduced or eliminate again from spatial noise along the noise of the incoming interior of building of ventilation shaft, become
One needs the urgent problem solved.
In prior art, it is adaptable to the noise reduction technology of ventilation shaft is broadly divided into passive noise reduction and active noise reduction techniques.Quilt
The main method of dynamic noise reduction technology is that ventilation shaft is designed to complexity, narrow and small and have the pipeline of multiple bending, and at pipeline
Inside lay sound-absorbing material, or sound absorption baffle or sound absorption cavity are set in pipeline, to reduce the purpose of noise.Passive noise reduction
Shortcoming be that denoising device volume ratio is relatively big, pipe bending and complexity cause flowing resistance bigger.
The principle of active noise reduction techniques is with utilizing interference of sound principle, arranges a secondary sound source, and makes secondary sound
The sound wave that source sends is identical with initial noisc signal sound and opposite in phase, and after sound wave superposition, interference is offset, thus reaches fall
The purpose of low noise.The advantage of active noise reducing device is that volume is smaller, and noise reduction frequency band is relatively wide, also can have preferably in low-frequency range
Noise reduction.Circuit control module is introduced so that the control of secondary sound source can be more accurate additionally, due to active noise reduction,
Noise reduction can also significantly improve by more passive noise reduction.
The pipeline active noise reduction system being currently known is more common in the gas extraction system of electromotor, such as Publication No.
CN94192686, the patent of invention entitled " active silencer "；Application No. CN201310036995, invention entitled " have
Source acoustic filter " etc. Chinese patent.It is exclusively used in ventilation shaft, such as Publication No. CN201310184657, invention entitled " one
Kind for the active silencer of air pipeline system " etc. Chinese patent.
Find in the research of pipeline active noise reduction system and practice process: existing pipeline active noise reducing device because
The sound wave that secondary sound source sends is not at grade with duct noise sound wave, it is impossible to just make the sound that secondary sound source sends
Ripple with duct noise sound wave acoustic pressure is identical with frequency and opposite in phase, the neutralization effect ratio of noise is relatively limited, and major part can only
The low frequency noise of 100Hz to 500Hz there is is good inhibiting effect, and poor even to the broadband noise effect in daily life
Can not suppress completely.Common noise scene in urban life environment, the market etc. concentrated such as busy and road, personnel, all
Present with broadband noise.The acoustic irradiation to one that the patent of Publication No. CN94192686 then sends due to secondary source of students
Inside open sound field, secondary sound source itself inevitably also can become a noise source.
Summary of the invention
For the shortcoming that active noise reduction effect of the prior art mentioned above is bad, this utility model provides one band
The ventilating duct device of active noise reduction and noise-reduction method, while not increasing flowing resistance, it is possible to arrives at 100Hz
The noise attenuation of 8～15dB is obtained in the relative broad range of 8000Hz.
The technical scheme of this utility model condition axle counting system is: the ventilating duct device of a kind of band active noise reduction, described
Ventilating duct device include spatial noise side ventilation shaft and noise damping space side ventilation shaft, spatial noise side ventilation shaft and
Noise damping space side ventilation shaft is interconnected, and noise damping space side ventilation shaft uses the interior of double-skin duct, respectively mutual sheathing
Layer pipeline and outer layer pipe, form ventilating interlayer between inner layer pipe and outer layer pipe are, spatial noise side ventilation shaft
Edge or at least one noise transducer internally installed, inner layer pipe is internally installed dynamic loudspeaker, noise transducer and electricity
Dynamic speaker is connected in noise reduction control circuit, and noise reduction control circuit receives the noise signal sent here from noise transducer,
Noise reduction control circuit drives dynamic loudspeaker.
The technical solution of the utility model further comprises:
Described inner layer pipe is confined space in noise damping space side, or absorbs through filling enough sound-absorbing materials
The sound after-opening of speaker back side radiant is in noise damping space, or it is empty in noise that opening is extended the most reversely wraparound after-opening
Between.
Described spatial noise side ventilation shaft, inner layer pipe and outer layer pipe are coaxially disposed.
Described spatial noise side ventilation shaft with inner layer pipe junction along pipeline circumference leaving certain gaps uncovered by the economic plan, pass through breach
Ventilation shaft inner space, spatial noise side is connected with ventilating interlayer.
The cross-sectional distribution of described spatial noise side ventilation shaft, inner layer pipe and outer layer pipe is circular or oval
Shape, square.
The beneficial effects of the utility model are: due in this utility model, sound wave plane that secondary sound source sends and noise
Sound wave plane parallel, therefore can obtain good broadband noise inhibition, support further through airflow mouth is opened in noise
Disappear in a little scope near cross section so that while ensureing ventilation, obvious noise suppression effect can be obtained again.
Below in conjunction with the drawings and specific embodiments, this utility model is described further.
Accompanying drawing explanation
Fig. 1 is the side cross-sectional view of the ventilating duct device of this utility model kind band active noise reduction.
Fig. 2 is the Facad structure schematic diagram of the ventilating duct device of this utility model kind band active noise reduction.
Fig. 3 is the structure schematic diagram of the ventilating duct device of this utility model kind band active noise reduction.
In figure, 1-spatial noise side ducts opening, 2-noise transducer, 3-noise reduction cross section, 4-spatial noise side ventilation duct
Road, 5-dividing plate, 6-noise reduction cross section opening, 7-dynamic loudspeaker, 8-noise damping space vent, 9-speaker back cavity closes plate, 10-
Speaker back cavity, 11-inner layer pipe, 12-outer layer pipe, 13-noise reduction control circuit.
Detailed description of the invention
The present embodiment is this utility model preferred implementation, and other its principles all are identical with the present embodiment with basic structure
Or approximation, all within this utility model protection domain.
This utility model is the ventilating duct device of a kind of band active noise reduction, and it is not increasing the same of flowing resistance
Time, it is possible in the relative broad range of 100Hz to 8000hz, obtain the noise attenuation of 8～15dB.
Refer to Fig. 1 and Fig. 2, the ventilating duct device of a kind of band active noise reduction in this utility model, specifically include that and make an uproar
Side, sound space ventilation shaft 4 and noise damping space side ventilation shaft, spatial noise side ventilation shaft 4 and noise damping space side ventilation shaft
Being interconnected, in the present embodiment, noise damping space side ventilation shaft uses double-skin duct, Wei inner layer pipe 11 and outer layer pipe
12, between inner layer pipe 11 and outer layer pipe 12, form ventilating interlayer, noise damping space side ventilation shaft opening part is provided with noise reduction
Space ventilator mouth 8.In the present embodiment, sense at the edge of spatial noise side ventilation shaft 4 or at least one noise internally installed
Device 2, noise transducer 2 can be by the sensor (such as: mike etc.) that noise transition is the signal of telecommunication for one or more, and sensor is pacified
Being contained in pipeline edge or the pipeline of pipeline, inner layer pipe 11 is internally installed a dynamic loudspeaker 7, noise transducer 2 and electronic
Speaker 7 is connected in noise reduction control circuit 13, and noise reduction control circuit 13 receives the noise letter sent here from noise transducer 2
Number, do and after phase place, amplitude, time delay etc. process, send signal of telecommunication driving dynamic loudspeaker 7 sounding, thus reach the effect of active noise reduction
Really.In the present embodiment, inner layer pipe 11, in noise damping space side, is closed between plate 9 at dynamic loudspeaker 7 and speaker back cavity
Space can be airtight, for speaker back cavity 10, or absorb speaker back side spoke through filling enough sound-absorbing materials
The sound after-opening penetrated is in noise damping space, it is also possible to opening is extended the most reversely wraparound and is opened on spatial noise.Electronic raise one's voice
Device 7, by the driving of noise reduction control circuit 13, sends secondary sound wave, exists with the noise come in along spatial noise side ventilation shaft 4
(noise reduction cross section 3 is the place, centre position of indentation, there of spatial noise side ventilation shaft 4 and inner layer pipe 11 for noise reduction cross section 3
Cross section) place's just frequency is identical with acoustic pressure but opposite in phase so that and the region acoustic pressure near at noise reduction cross section 3 is minimum.
In the present embodiment, the cross section of spatial noise side ventilation shaft 4, inner layer pipe 11 and outer layer pipe 12 be circular or
The pipeline of other abnormity such as oval, square, and being coaxially disposed, the opening of spatial noise side ventilation shaft 4 towards spatial noise,
Interlayer opening between inner layer pipe 11 and outer layer pipe 12 is towards noise damping space.
In the present embodiment, spatial noise side ventilation shaft 4 and inner layer pipe 11 are not joined directly together, but in noise cross section 3
Centered by place have an opening so that ventilation shaft 4 inner space, spatial noise side connects with noise damping space vent 8.This enforcement
In example, spatial noise side ventilation shaft 4 and inner layer pipe 11 near noise reduction cross section 3 along pipeline circumference leaving certain gaps uncovered by the economic plan, for noise reduction
Cross section opening 6, makes ventilation shaft 4 inner space, spatial noise side with noise damping space vent 8 even by noise reduction cross section opening 6
Logical.
Below will the utility model is described in further detail with instantiation.
In the present embodiment, described dividing plate 5 is building walls, and spatial noise side ventilation shaft 4 opening is towards outdoor, outward
Layer pipeline 12 opening is towards indoor.The inner layer pipe of the shape of spatial noise side ventilation shaft 4 and sectional area and noise damping space side
Shape and the sectional area of 11 are equal, use the circular pipe of a diameter of 4cm, and inner layer pipe 11 diameter of noise damping space side is also
4cm.When device each node draught area that this utility model relates to is identical, outer layer pipe 12 diameter of noise damping space side is internal layer
Pipeline 4 diameterTimes, about 1.414 times；Width between noise reduction cross section opening 6 and noise damping space vent 8 is interior
The 1/4 of layer pipeline 11 diameter, i.e. 1cm.In the case of the sectional area of spatial noise side ventilation shaft 4 is sufficiently large, noise reduction cross section
A/F increases, and ventilation increases, but noise reduction is the poorest；Noise reduction cross section A/F reduces, and noise reduction improves, but logical
Air quantity diminishes.During it was verified that noise reduction cross section opening is 0.5～about 1.0cm, noise reduction is preferable.With circular pipe and fall
As a example by cross section A/F of making an uproar is 1cm, a diameter of 4cm of spatial noise side ventilation shaft 4 and inner layer pipe 11 can be calculated,
Outer layer pipe 12 diameter 5.656cm.Dynamic loudspeaker 7 uses the full frequency band flat speaker of 4cm bore common on market.This
Time single pipeline diameter less, ventilation is limited, can use the method stronger ventilation amount that multiple pipeline is arranged side by side, or
Line size and speaker size are strengthened.
Spatial noise and noise damping space, by can the dividing plate 5 of sound insulation keep apart, are used between noise space and noise damping space
Circular or other special-shaped pipelines connect.The pipeline 4 opening 1 in noise space one end be without hindrance every open ports.Dynamic loudspeaker 7
Back cavity closes chamber, to isolate secondary noise.Speaker back cavity may also pass through fills the enough sound-absorbing material absorption speaker back side
The sound after-opening of radiation is in noise damping space, or leads to the spatial noise outlet as secondary noise by back-flexing pipeline.
In pipeline, one end pipe near spatial noise is provided with electronic equipped with noise transducer 2, pipeline near one end of noise damping space
Speaker 7.Sensor noise 2 picks up the noise from the incoming pipeline of spatial noise and changes the signal of telecommunication, and the signal of telecommunication passes through noise reduction control
After circuit 13 processed does the process such as phase place, amplitude, time delay, dynamic loudspeaker 7 is driven to send secondary sound wave, secondary sound wave and incoming pipe
The noise signal in road frequency same sound pressure at noise reduction cross section 3 is identical but opposite in phase so that the acoustic pressure at noise reduction cross section 3 is
Little.Noise reduction cross section opening 6 it is provided with on duct wall corresponding at noise reduction cross section 3, collateral branch's passage that noise reduction cross section opening 6 is formed
Other end noise damping space vent 8 is opened in noise damping space, is used for providing ventilation channel.
Technical solutions of the utility model due to employ dynamic loudspeaker 7 send secondary sound wave and at noise reduction cross section 3 shape
Become the cross section that acoustic pressure is minimum, and noise reduction cross section opening 6 is set on this cross section so that between spatial noise and noise damping space both
Can keep ventilating and the noise being delivered to noise damping space from spatial noise by ventilation shaft can being substantially reduced.Contrast uses
The denoising device of roundabout pipeline, the structure that originally installs pipes air channel is fairly simple, and flowing resistance is little.Contrast use is bled, air suction type
Denoising device, this device only affects noise reduction, does not affect ventilation, it is also possible to bidirectional ventilated when non-transformer.
Owing to, in this utility model, the sound wave plane that secondary sound source sends is parallel with the sound wave plane of noise, therefore can obtain
To good broadband noise inhibition, further through airflow mouth being opened in a little scope near noise cancellation cross section
In so that obvious noise suppression effect can be obtained again while ensureing ventilation.
Claims (5)
1. a ventilating duct device for band active noise reduction, is characterized in that: described ventilating duct device includes spatial noise side
Ventilation shaft (4) and noise damping space side ventilation shaft, spatial noise side ventilation shaft (4) and noise damping space side ventilation shaft are mutual
Connection, noise damping space side ventilation shaft uses inner layer pipe (11) and the outer layer pipe of double-skin duct, respectively mutual sheathing
(12), between inner layer pipe (11) and outer layer pipe (12) are, ventilating interlayer, the limit of spatial noise side ventilation shaft (4) are formed
Edge or at least one noise transducer internally installed (2), inner layer pipe (11) is internally installed dynamic loudspeaker (7), and noise passes
Sensor (2) and dynamic loudspeaker (7) are connected in noise reduction control circuit (13), and noise reduction control circuit (13) receives from noise
The noise signal that sensor (2) is sent here, noise reduction control circuit (13) drives dynamic loudspeaker (7).
The ventilating duct device of band active noise reduction the most according to claim 1, is characterized in that: described inner layer pipe (11)
It is confined space in noise damping space side, or after filling the sound of enough sound-absorbing material absorption speaker back side radiant
It is opened on noise damping space, or opening is extended the most reverse wraparound after-opening in spatial noise.
The ventilating duct device of band active noise reduction the most according to claim 1, is characterized in that: described spatial noise side leads to
Wind pipeline (4), inner layer pipe (11) and outer layer pipe (12) are coaxially disposed.
The ventilating duct device of band active noise reduction the most according to claim 1, is characterized in that: described spatial noise side leads to
Wind pipeline (4) with inner layer pipe (11) junction along pipeline circumference leaving certain gaps uncovered by the economic plan, by breach, spatial noise side is ventilated
Pipeline (4) inner space connects with ventilating interlayer.
The ventilating duct device of band active noise reduction the most according to claim 1, is characterized in that: described spatial noise side leads to
The cross-sectional distribution of wind pipeline (4), inner layer pipe (11) and outer layer pipe (12) is circular or oval, square.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620491548.5U CN205877574U (en) | 2016-05-25 | 2016-05-25 | Take active noise reduction's air pipe device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620491548.5U CN205877574U (en) | 2016-05-25 | 2016-05-25 | Take active noise reduction's air pipe device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205877574U true CN205877574U (en) | 2017-01-11 |
Family
ID=57689525
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620491548.5U Expired - Fee Related CN205877574U (en) | 2016-05-25 | 2016-05-25 | Take active noise reduction's air pipe device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205877574U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105927816A (en) * | 2016-05-25 | 2016-09-07 | 徐敏锋 | Air conduit device with active noise reduction function and noise reduction method |
-
2016
- 2016-05-25 CN CN201620491548.5U patent/CN205877574U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105927816A (en) * | 2016-05-25 | 2016-09-07 | 徐敏锋 | Air conduit device with active noise reduction function and noise reduction method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20170111 Termination date: 20200525 |