CN104165256B - A kind of active silencer for air pipeline system - Google Patents
A kind of active silencer for air pipeline system Download PDFInfo
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- CN104165256B CN104165256B CN201310184657.3A CN201310184657A CN104165256B CN 104165256 B CN104165256 B CN 104165256B CN 201310184657 A CN201310184657 A CN 201310184657A CN 104165256 B CN104165256 B CN 104165256B
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- pipeline section
- capping
- interior pipeline
- loudspeaker unit
- housing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/02—Energy absorbers; Noise absorbers
- F16L55/033—Noise absorbers
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
The present invention relates to a kind of active silencer for air pipeline system, comprise shell, interior pipeline section, loudspeaker unit, error microphone and loudspeaker power amplifier board; Shell comprises capping and housing; The platy structure of perforate centered by capping, housing is the barrel-like structure of bottom centre position perforate, one end of interior pipeline section is passed the hole of cap central and is fixed in capping, and the other end of interior pipeline section embeds the hole being arranged in casing center, and capping is installed to the top of housing; The surrounding of interior pipeline section is separately installed with loudspeaker unit, error microphone and loudspeaker power amplifier board, the output interface of loudspeaker power amplifier board is connected with loudspeaker unit, and the output interface of its signal input interface, power interface and error microphone is drawn by the electric coupler be installed on housing; The side of interior pipeline section having the annular flange flange for installing loudspeaker unit, there is multiple perforation in the tube wall of loudspeaker unit and interior pipeline section corresponding to error microphone installed position.
Description
Technical field
The present invention relates to field of acoustics, particularly a kind of active silencer for air pipeline system.
Background technique
Air pipeline System noise is noise source common in life, the radiated sound of such as central air-conditioning system exhaust outlet, the radiated sound etc. in ship's ventilating system entry/exit air port, its all-bottom sound energy is general comparatively remarkable, and the physiology to people, mental health is had a negative impact.In order to effectively suppress low-frequency noise, traditional passive silencing apparatus generally has larger volume and the higher pressure loss, and its Practical significance is very limited.Therefore, effectively need suppress by means of the low frequency radiation noise of Technique of Active Noise Control to the air pipeline system mouth of pipe.
Active noise control using is a kind of active noise control technique based on sound wave coherent addition principle, the earliest by P.Lueg its patent No. be US2043416, name is called in the U.S. Patent application of " Processofsilencingsoundoscillations " and proposes, its basic principle is introduced secondary sound source and is utilized it to send but phase place contrary " antinoise " identical with initial noisc amplitude in sound field, make initial noisc obtain relevant counteracting, thus reach the object of noise suppression.Compared with the passive noise-reduction method of tradition, Technique of Active Noise Control main advantage is to obtain better low frequency noise reduction with the equipment of more small volume.Along with the raising of people's living standard, low-frequency noise pollution problem is day by day remarkable, and the practical demand of Technique of Active Noise Control is day by day urgent.On the other hand, through the development of last 100 years, especially along with the leap of Digital Signal Processing nearly decades, Technique of Active Noise Control is increasingly mature, and its practicalization is just progressively accelerated.
Pipe-line system is the exemplary situations of Active noise control using application, for the low-frequency noise below pipeline cut-off frequency, uses single loudspeaker effectively to suppress it.Pipeline active silencer patent known is at present more common in engine exhaust system, and such as publication number is the Chinese patent application such as CN1126525A, CN101555818A, CN102808681.
Initial noisc signal in pipeline active noise control system general microphone pickup tube, and send antinoise by secondary sound source and offset, namely microphone and secondary sound source need interact with sound field in pipe.For realizing the coupling of sound field, microphone and secondary sound source place air should with conducting in pipe, this means that this place's inner-walls of duct exists certain discontinuity.When inner air tube flow velocity is higher, the air-flow of this discontinuous boundary will be disturbed thus excite quadratic noise, have a strong impact on soundproof effect.Therefore, how ensureing the stationarity of microphone and secondary sound source place air-flow under high flow rate, reducing exciting of quadratic noise is the subject matter that air pipeline system active silencing apparatus faces.
Summary of the invention
The object of the invention is to the defect overcoming existing ventilation pipeline silencer low-frequency effect difference, thus a kind of adaptation high altitude stream speed, the significant active silencer of low frequency soundproof effect are provided.
To achieve these goals, the invention provides a kind of active silencer for air pipeline system, comprise shell 1, interior pipeline section 4, loudspeaker unit 5, error microphone 6 and loudspeaker power amplifier board 7; Wherein,
Described shell 1 comprises capping 2 and housing 3; The platy structure of perforate centered by described capping 2, described housing 3 is the barrel-like structure of bottom centre position perforate, one end of described interior pipeline section 4 is passed the hole at described capping 2 center and is fixed in described capping 2, the other end of described interior pipeline section 4 then embeds the hole being arranged in described housing 3 center, and described capping 2 is installed to the top of described housing 3; The surrounding of described interior pipeline section 4 is separately installed with described loudspeaker unit 5, error microphone 6 and loudspeaker power amplifier board 7, wherein the output interface of loudspeaker power amplifier board 7 is connected with loudspeaker unit 5, and the output interface of its signal input interface, power interface and error microphone 6 is then drawn by the electric coupler 8 be installed on described housing 3;
The side of described interior pipeline section 4 having the annular flange flange for installing described loudspeaker unit 5, there is multiple perforation in the tube wall 9 of described loudspeaker unit 5 and described interior pipeline section 4 corresponding to described error microphone 6 installed position.
In technique scheme, described loudspeaker unit 5, error microphone 6, loudspeaker power amplifier board 7 are installed along the diverse location of described interior pipeline section 4 circumference, and its circumferential angle intervals is 90 °.
In technique scheme, the mounting point of described error microphone 6 is in the downstream sound field of described loudspeaker unit 5.
In technique scheme, the outside of described capping 2 is also provided with the first flange 11 that is threaded hole, the center hole of described first flange 11 is communicated with described interior pipeline section 4, and by this first flange 11, the upstream of ventilation system realizes the connection with described capping 2.
In technique scheme, the outside of described housing 3 bottom surface is also provided with the second flange 11 that another is threaded hole, the center hole of described second flange 11 is communicated with described interior pipeline section 4, and by this second flange 11, the downstream pipe of ventilation system realizes the connection with described housing 3.
In technique scheme, in the joint of described capping 2 and described housing 3 and all use rubber pad 10 to seal in the joint of described interior pipeline section 4 and described housing 3.
In technique scheme, the diameter of the perforation on the tube wall 9 of described interior pipeline section 4 is 2mm, and punching rate is more than 25%.
In technique scheme, inside described housing 3, attach the sound-absorbing material 12 of the back cavity radiated sound for absorbing described loudspeaker unit 5.
The invention has the advantages that:
Volume is little, the pressure loss is low, low frequency soundproof effect remarkable, can tolerate higher air velocity simultaneously.
Accompanying drawing explanation
Fig. 1 is the front section view of the active silencer for air pipeline of the present invention;
Fig. 2 is that sectional view is looked on a left side for the active silencer for air pipeline of the present invention;
Fig. 3 is the structural representation for pipeline section in the active silencer of air pipeline of the present invention;
Fig. 4 is the overall appearance figure of the active silencer for air pipeline of the present invention.
Accompanying drawing identifies
1, shell 2, capping 3, housing
4, interior pipeline section 5, loudspeaker unit 6, error microphone
7, loudspeaker power amplifier board 8, electric coupler 9, tube wall
10, rubber pad 11, flange 12, sound-absorbing material
Embodiment
Now the invention will be further described by reference to the accompanying drawings.
With reference to figure 1 and Fig. 2, the active silencer for air pipeline system provided by the invention comprises shell 1, interior pipeline section 4, loudspeaker unit 5, error microphone 6 and loudspeaker power amplifier board 7; Wherein, described shell 1 comprises capping 2 and housing 3; The platy structure of perforate centered by described capping 2, described housing 3 is the barrel-like structure of bottom centre position perforate, one end of described interior pipeline section 4 is passed the hole at described capping 2 center and is fixed in described capping 2, the other end of described interior pipeline section 4 then embeds the hole being arranged in described housing 3 center, and described capping 2 is installed to the top of described housing 3; The surrounding of described interior pipeline section 4 is separately installed with described loudspeaker unit 5, error microphone 6 and loudspeaker power amplifier board 7, wherein the output interface of loudspeaker power amplifier board 7 is connected with loudspeaker unit 5, the output interface of its signal input interface, power interface and error microphone 6 is then drawn by the electric coupler 8 be installed on housing 3, thus is connected with the control system of outside.
Below all parts of active silencer of the present invention is described further.
In the present embodiment, described capping 2 is a plectane, and the perforate of its central position is a circular hole, and the diameter of this circular hole is identical with the external diameter of described interior pipeline section 4.The outside of described capping 2 is also provided with the flange 11 that is threaded hole, and the center hole of described flange 11 is communicated with described interior pipeline section 4, and by this flange 11, the upstream of ventilation system realizes the connection with capping 2.In other embodiments, described capping 2 also can be the plate of other shapes, and the perforate of its central position also can be other shapes, but should be consistent with pipe section.
In the present embodiment, described housing 3 is for opening round-meshed drum-shaped structure in bottom center position, and the diameter of this circular hole is identical with the external diameter of described interior pipeline section 4.The outside of described housing 3 bottom surface is also provided with the flange 11 that is threaded hole, and the center hole of described flange 11 is communicated with described interior pipeline section 4, and by this flange 11, the downstream pipe of ventilation system realizes the connection with described housing 3.In other embodiments, described housing 3 also can be the bucket of other shapes, and the perforate of its bottom center position also can be other shapes, but should be consistent with pipe section.
Described capping 2 is connected by screw the combination realized between the two with between housing 3, as the preferred implementation of one, in the present embodiment, for ensureing tightness, in the joint of described capping 2 and described housing 3 and all use rubber pad 10 to seal in the joint of described interior pipeline section 4 and described housing 3.
As shown in Figure 2, in the present embodiment, described interior pipeline section 4 is the drum-shaped of a both ends open, and its side has annular flange flange, described loudspeaker unit 5 is installed on this annular flange portion, and the cavity between described shell 1 and described interior pipeline section 4 defines the back cavity of described loudspeaker unit 5; Described error microphone 6, loudspeaker power amplifier board 7 are fixed on described interior pipeline section 4 respectively by respective support.As the preferred implementation of one, as shown in Figure 1, in the present embodiment, for making full use of space, reducing silencing apparatus overall volume, loudspeaker unit 5, error microphone 6, loudspeaker power amplifier board 7 are installed along the diverse location of interior pipeline section 4 circumference, and its circumferential angle intervals is 90 °.Meanwhile, loudspeaker unit 5 and error microphone 6 to be installed on interior pipeline section 4 diverse location vertically, and namely error microphone 6 should be in the downstream sound field of loudspeaker unit 5, thus guarantees effective suppression of downstream pipe noise.
As shown in Figure 2, there is the perforation of high density, small aperture in the tube wall 9 of described loudspeaker unit 5 and interior pipeline section 4 corresponding to described error microphone 6 installed position, its objective is, while realizing entrant sound, water conservancy diversion is carried out to the air-flow in pipeline, suppress the quadratic noise of being given birth to by high-speed air flow movable property, ensure soundproof effect.In the present embodiment, the diameter in the hole on described tube wall 9 is 2mm, and punching rate is 25%.In other embodiments, the diameter of perforation and punching rate can carry out actual adjustment according to wind speed in pipe.
In the present embodiment, described loudspeaker unit 5 adopts 4 inches of loudspeaker units, and described error microphone 6 adopts 1/2 inch of error microphone.
As the preferred implementation of one, in the present embodiment, inside described housing 3, attach sound-absorbing material 12, to absorb the back cavity radiated sound of loudspeaker unit 5.
Fig. 3 is in the present embodiment, the overall schematic of the active silencer for air pipeline system of the present invention, and described silencing apparatus entirety is cylindrical, and outside dimension is Φ 300mm × 150mm, the ventilation system pipeline of corresponding Φ 100mm.
The active silencer that the present embodiment provides both inserted mode can be installed in ventilation system pipeline, to the pipeline in downstream, insertion point and controlled, and also directly can be installed on entry/exit air port, directly suppress mouth of pipe radiated noise.Measured result shows, under in pipe, airspeed is not more than the condition of 20m/s, this embodiment not only effectively can eliminate the line spectrum noise that blower fan rotates excitation, and the narrowband random flow noise caused by pipe internal resonance of also can decaying, its pressure loss is close to 0.
It should be noted last that, above embodiment is only in order to illustrate technological scheme of the present invention and unrestricted.Although with reference to embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, modify to technological scheme of the present invention or equivalent replacement, do not depart from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (8)
1. for an active silencer for air pipeline system, it is characterized in that, comprise shell (1), interior pipeline section (4), loudspeaker unit (5), error microphone (6) and loudspeaker power amplifier board (7); Wherein,
Described shell (1) comprises capping (2) and housing (3); The platy structure of perforate centered by described capping (2), the barrel-like structure that described housing (3) is bottom centre position perforate, one end of described interior pipeline section (4) is passed the hole at described capping (2) center and is fixed in described capping (2), the other end of described interior pipeline section (4) then embeds the hole being arranged in described housing (3) center, and described capping (2) is installed to the top of described housing (3); The surrounding of described interior pipeline section (4) is separately installed with described loudspeaker unit (5), error microphone (6) and loudspeaker power amplifier board (7), wherein the output interface of loudspeaker power amplifier board (7) is connected with loudspeaker unit (5), and the output interface of its signal input interface, power interface and error microphone (6) is then drawn by the electric coupler (8) be installed on described housing (3);
The side of described interior pipeline section (4) having the annular flange flange for installing described loudspeaker unit (5), there is multiple perforation in the tube wall (9) of described loudspeaker unit (5) and described interior pipeline section (4) corresponding to described error microphone 6 installed position.
2. the active silencer for air pipeline system according to claim 1, it is characterized in that, described loudspeaker unit (5), error microphone (6), loudspeaker power amplifier board (7) are installed along the diverse location of described interior pipeline section (4) circumference, and its circumferential angle intervals is 90 °.
3. the active silencer for air pipeline system according to claim 1, is characterized in that, the mounting point of described error microphone (6) is in the downstream sound field of described loudspeaker unit (5).
4. the active silencer for air pipeline system according to claim 1, it is characterized in that, the outside of described capping (2) is also provided with the first flange (11) that is threaded hole, the center hole of described first flange (11) is communicated with described interior pipeline section (4), by this first flange (11), the upstream of ventilation system realizes the connection with described capping (2).
5. the active silencer for air pipeline system according to claim 1, it is characterized in that, the outside of described housing (3) bottom surface is also provided with the second flange (11) that another is threaded hole, the center hole of described second flange (11) is communicated with described interior pipeline section (4), by this second flange (11), the downstream pipe of ventilation system realizes the connection with described housing (3).
6. the active silencer for air pipeline system according to claim 1, it is characterized in that, in the joint of described capping (2) and described housing (3) and all use rubber pad (10) to seal in the joint of described interior pipeline section (4) and described housing (3).
7. the active silencer for air pipeline system according to claim 1, is characterized in that, the diameter of the perforation on the tube wall (9) of described interior pipeline section (4) is 2mm, and punching rate is more than 25%.
8. the active silencer for air pipeline system according to claim 1, is characterized in that, attaches the sound-absorbing material (12) of the back cavity radiated sound for absorbing described loudspeaker unit (5) in described housing (3) inner side.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310184657.3A CN104165256B (en) | 2013-05-17 | 2013-05-17 | A kind of active silencer for air pipeline system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310184657.3A CN104165256B (en) | 2013-05-17 | 2013-05-17 | A kind of active silencer for air pipeline system |
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| Publication Number | Publication Date |
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| CN104165256A CN104165256A (en) | 2014-11-26 |
| CN104165256B true CN104165256B (en) | 2016-02-03 |
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| CN201310184657.3A Active CN104165256B (en) | 2013-05-17 | 2013-05-17 | A kind of active silencer for air pipeline system |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104500904B (en) * | 2015-01-04 | 2016-06-29 | 哈尔滨工程大学 | The integrated active silencer of high-pressure liquid-filling pipeline |
| CN105509292B (en) * | 2016-01-25 | 2019-05-24 | 中国船舶重工集团公司第七一一研究所 | A kind of active ventilated silencing apparatus |
| 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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| EP0393257A1 (en) * | 1989-04-17 | 1990-10-24 | Emitec Gesellschaft für Emissionstechnologie mbH | Diesel soot filter with an additional arrangement for the reduction of nitrogen oxides and/or the oxidation of carbon monoxide |
| EP0488105A1 (en) * | 1990-11-26 | 1992-06-03 | The Social Welfare Foundation Hokkaido Rehabily | Activated carbon, production thereof and its use for adsorption |
| CN201187857Y (en) * | 2008-04-03 | 2009-01-28 | 中国舰船研究设计中心 | Assembly type ventilation pipeline silencer |
| CN101691875A (en) * | 2009-09-28 | 2010-04-07 | 浙江金盾风机风冷设备有限公司 | Active silencer for large underground reversible fan |
| CN203286198U (en) * | 2013-05-17 | 2013-11-13 | 中国科学院声学研究所 | Active silencer for vent pipeline system |
-
2013
- 2013-05-17 CN CN201310184657.3A patent/CN104165256B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0393257A1 (en) * | 1989-04-17 | 1990-10-24 | Emitec Gesellschaft für Emissionstechnologie mbH | Diesel soot filter with an additional arrangement for the reduction of nitrogen oxides and/or the oxidation of carbon monoxide |
| EP0488105A1 (en) * | 1990-11-26 | 1992-06-03 | The Social Welfare Foundation Hokkaido Rehabily | Activated carbon, production thereof and its use for adsorption |
| CN201187857Y (en) * | 2008-04-03 | 2009-01-28 | 中国舰船研究设计中心 | Assembly type ventilation pipeline silencer |
| CN101691875A (en) * | 2009-09-28 | 2010-04-07 | 浙江金盾风机风冷设备有限公司 | Active silencer for large underground reversible fan |
| CN203286198U (en) * | 2013-05-17 | 2013-11-13 | 中国科学院声学研究所 | Active silencer for vent pipeline system |
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| CN104165256A (en) | 2014-11-26 |
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Effective date of registration: 20180313 Address after: 215000 401 Room 401, No. 158, Jinfeng Road, science and Technology City, high tech Zone, Jiangsu Province Patentee after: In the new science and Technology Co. Ltd. (Suzhou) Address before: 100190 Beijing City, North Fourth Ring Road West, No. 21, No. Patentee before: Institute of acoustics, Chinese Academy of Sciences |