CN101240684B - Silencing apparatus - Google Patents
Silencing apparatus Download PDFInfo
- Publication number
- CN101240684B CN101240684B CN200810003068XA CN200810003068A CN101240684B CN 101240684 B CN101240684 B CN 101240684B CN 200810003068X A CN200810003068X A CN 200810003068XA CN 200810003068 A CN200810003068 A CN 200810003068A CN 101240684 B CN101240684 B CN 101240684B
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- Prior art keywords
- noise elimination
- elimination part
- noise
- sound wave
- mentioned
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- Expired - Fee Related
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- 230000030279 gene silencing Effects 0.000 title claims abstract description 31
- 238000009423 ventilation Methods 0.000 claims abstract description 26
- 230000008030 elimination Effects 0.000 claims description 86
- 238000003379 elimination reaction Methods 0.000 claims description 86
- 238000013022 venting Methods 0.000 claims description 35
- 239000000463 material Substances 0.000 claims description 10
- 238000013016 damping Methods 0.000 claims description 5
- 230000003467 diminishing effect Effects 0.000 claims description 2
- 208000004350 Strabismus Diseases 0.000 claims 1
- 238000000034 method Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 10
- 238000005452 bending Methods 0.000 description 7
- 238000004080 punching Methods 0.000 description 5
- 238000005273 aeration Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 230000008676 import Effects 0.000 description 4
- 238000009413 insulation Methods 0.000 description 3
- 238000009435 building construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 239000011796 hollow space material Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 230000002000 scavenging effect Effects 0.000 description 1
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Abstract
The present invention provides a silencing arrangement. The silencing arrangement has a louver structure which arranges multiple blade-bodies and processes internal and external ventilation of the buildings by ventilation channels formed on the blade-bodies and between blade-bodies. Each blade includes a pair of silencing parts arranged on the noise side and the mute side respectively and an acoustic introduction part connecting theses silencing parts. Each blade is arranged that the length direction axis of one silencing part parallelly extends along the inclined direction opposite to the length direction axis of the other silencing part, but one axis is shift relative to the other one.
Description
Technical field
The present invention relates to the silencing means of arranging a plurality of blade bodies and the shutter tectosome of formation venting channels forms between these blade bodies and blade body.In more detail; Relate to the shutter tectosome that will constitute silencing means and be installed on the wall of building construction, make the silencing means that reduces from the energy of the noise sound wave propagated to opposite side (quiet side) through the venting channels between the blade body at the noise source of shutter tectosome one side with extraneous gas.
Background technology
In the past, sound-proof wall was as preventing that a kind of device from automobile, job site, noise that other noise source produced is widely known by the people.To be arranged on by the wall body that resin plate with light transmission or metal parts constitute the other or job site of road around; The noise that produces in a side of wall can not directly propagate into opposite side; The high more soundproof effect of the height of wall improves more, thereby the tendency that has it to improve highly gradually.
In addition; The kind of noise source is except said apparatus; The device that also has industrial machinery, air-conditioner outdoor unit etc. to be provided with the incidental form fix of building construction; Aeration that this noise source need be guaranteed relative extraneous gas mostly and ventilation property need be dispelled the heat to following the heat that produces as the running of the mechanical device of noise source.If consider sound insulation property at first; It then originally is the wall body of hoping to be provided with a side of cutting off side with noise source and noiselessness source fully; But owing to can not ignore the problem of heat radiation; Therefore make the shutter structure through the part of the wall around will covering, can have both to a certain degree soundproof effect and two aspects of aeration.
For example open in the flat 8-28153 communique and disclose following shutter door leaf the patent documentation spy of Japan; Promptly cut apart hollow door leaf body interior and constitute passage with dividing plate; And paste damping material at channel inner surface, and shutter is installed respectively at the door leaf surface and the back side of channel end.According to the disclosed technology of this patent documentation, the noise that gets into from door leaf one side's shutter is carried out sound insulation by passage, and through in passage, being carried out sound-absorbing by damping material, thereby can carry out noise reduction though possess shutter as door leaf.
According to the prior art that above-mentioned patent documentation is put down in writing, can when guaranteeing aeration, the side from door leaf carry out noise reduction with respect to opposite side.But, owing to being made hollow structure, the door leaf body interior forms passage, its passage self is installed shutter in channel end as silence space the time, so its structure spreads all over whole door leaf, can not use separately as shutter.Thereby the cost increase is natural, also has the problem that lacks the versatility of construction site.In addition, therefore not only time-consuming on construction operation because need sizable installing space when constructing for the size of the shutter that is emerging in the surface, and neither be good from the scavenging efficiency aspect.
Summary of the invention
The present invention makes for the problem points of handling above-mentioned prior art and having; Its purpose is the silencing means that the noise sound wave that is transmitted to opposite side from the noise source of a side of the shutter tectosome that constitutes wall is reduced, and a kind of silencing means that possesses sound insulation property when possessing good application property and aeration is provided.
Silencing means according to the present invention has through being formed at the shutter structure that venting channels between a plurality of blade bodies carries out the ventilation inside and outside the building, reduces the acoustic pressure through the noise sound wave of this venting channels.The a plurality of blade bodies that form the shutter structure possess noise elimination part that damping material is housed in the inner space of hollow structure, in this noise elimination part direct sound waves sound wave importing portion and be communicated with the inner space of above-mentioned noise elimination part and the noise elimination part opening in the outside.And, stagger the installation site from the two ends (noise side ventilation opening and quiet side ventilation opening) of above-mentioned venting channels and form a pair of noise elimination part, and each noise elimination part is linked into an integrated entity with above-mentioned sound wave importing portion.
In above-mentioned silencing means, sound wave importing portion can form with the plate-shaped member with curved surface.In addition, also can the end of this plate-shaped member be fixed on the edge of opening portion of above-mentioned noise elimination part opening.Have again, also can the opening size of above-mentioned noise elimination part opening be made from edge of opening portion to the diminishing shape of the inner space of above-mentioned noise elimination part.
Have, in above-mentioned silencing means, at least a portion at the position of facing with above-mentioned venting channels in the side of above-mentioned noise elimination part can be made up of the sheet material with sound wave penetrability again.
In the present invention, on the blade body of dividing venting channels, be provided with the waveguide of noise elimination part harmony and go into portion.And, from the end of the noise side ventilation oral-lateral of venting channels and the both sides of the end of the quiet side ventilation oral-lateral installation site of staggering this noise elimination part is installed, portion links into an integrated entity each noise elimination part with the sound wave importing.Formed each other venting channels at the blade body of this structure; Through possessing the bend of crank-like halfway, the noise sound wave that the end (quiet side ventilation opening) from venting channels is got into imports the noise elimination part through the noise elimination part opening from sound wave importing portion at this bend.
Thereby; Need not to make venting channels self to have the effect of silencing function; Venting channels is used as the passage of special ventilating air, will import with the noise sound wave that ozone gets in the noise elimination part that is arranged with the venting channels branch during ventilation, thereby can realize noise reduction.In addition,, therefore do not need large-scale construction works owing to receive whole device in the size content of the shutter that is revealed in construction surface, can be as exterior member/adorn outward part general and use widely.
In addition; Because the noise elimination part that will be provided with from the venting channels two ends uses the sound wave importing portion that is made up of the plate-shaped member with curved surface to connect; And will get into noise sound wave in the venting channels with camber reflection and import in the noise elimination part, and therefore can make the noise sound wave concentrate near the guiding efficiently focus of curved surface.This occasion; The end of the plate-shaped member through will forming sound wave importing portion is fixed in the edge of opening portion of noise elimination part opening; Can the noise sound wave with the camber reflection of sound wave importing portion be concentrated on the noise elimination part opening more efficiently, and then can realize the raising of erasure effect.
In addition; Through the opening size of noise elimination part opening being made the shape that diminishes gradually to the inner space of noise elimination part from edge of opening portion; The sectional area of openend of direction that the sectional area ratio noise sound wave of the openend of the direction that the noise sound wave is outwards gone out from inner space gets into inner space is little; Thereby, can suppress to be captured in the generation of the phenomenon that the noise sound wave in the noise elimination part outwards spills once more.
In addition, at least a portion apparatus of the side through the noise elimination part that will face with venting channels has the sheet material of sound wave penetrability to constitute, and can increase the noise sound wave of introducing in the noise elimination part, can improve erasure effect.
Description of drawings
Fig. 1 is the key diagram of outward appearance that expression relates to the silencing means of one embodiment of the present of invention.
Fig. 2 is the cross-sectional illustration figure of the major part structure of the expression silencing means that relates to one embodiment of the present of invention.
Fig. 3 A and Fig. 3 B are the key diagrams about the curve shape that sound wave baffle-board had of one embodiment of the present of invention.
The specific embodiment
The silencing means 1 that relates to one embodiment of the present of invention possesses the shutter structure.On the second side 3b of the first side 3a of main body case 3 and rear side thereof, on left and right directions, be provided with a plurality of ventilation openings 2.But, in Fig. 1, only can see the first side 3a, can't see the second side 3b of its rear side.As shown in Figure 1, on the 3a of this first side, be provided with the ventilation opening 2a of noise side.A side that when silencing means 1 is set, this noise side ventilation opening 2a is existed towards noise source.In addition, though in Fig. 1, do not represent, on the second side 3b, be provided with the ventilation opening 2b of quiet side.
Fig. 2 representes the part in the horizontal direction cross section of silencing means shown in Figure 11.Constitute in a plurality of blade bodies 4 of shutter structure, in Fig. 2, only represented two blade bodies 4.Blade body 4 is reserved the predetermined distance configuration with the blade body on its next door, between them, is formed with venting channels 5.This venting channels 5 is opened on the ventilation opening 2a of noise side and the ventilation opening 2b of quiet side.That is, utilize venting channels 5 to be communicated with noise side ventilation opening 2a and quiet side ventilation opening 2b.
Blade body 4 comprises: be configured in the first noise elimination part 4-1 of noise side, the sound wave importing 4-2 of portion that is configured in the second noise elimination part 4-1 of quiet side and links these first, second noise elimination part 4-1,4-1.First noise elimination part (noise elimination part of noise side) 4-1 and second noise elimination part (noise elimination part of quiet side) 4-1 are roughly same configuration and are made up of hollow structure, and on the other hand, the sound wave importing 4-2 of portion is made up of plate-shaped member.Extend abreast in the length direction axle center of the length direction axle center of the noise elimination part 4-1 of noise side and the noise elimination part 4-1 of quiet side; It is the direction that tilts with respect to the direction (normal direction) vertical with the face of the wall body that silencing means 1 is installed; And; These two length direction axle center not on same straight line, but one relative another at the left and right directions predetermined distance that squinted.Its result, formed venting channels 5 is the crooked shape of crank-like between the blade body 4 on blade body 4 and its next door.
As stated, noise elimination part 4-1 is hollow structure, is formed with hollow space in the inboard.Thereby in this hollow space, hold by peeling off the quieter material 6 that porous materials such as fibrous materials such as fiber or polyurethane constitute and constitute the 4-1a of anechoic chamber.The 4-1a of this anechoic chamber is communicated with venting channels 5 through noise elimination part opening 4-1b (following).
The sound wave importing 4-2 of portion of the noise elimination part 4-1 of binding noise side and the noise elimination part 4-1 of quiet side is made up of the first sound wave baffle-board 4-2a and the second sound wave baffle-board 4-2b.The first sound wave baffle-board 4-2a extends to the noise elimination part opening 4-1b of the noise elimination part 4-1 of noise side from the base portion of the noise elimination part 4-1 of quiet side.The second sound wave baffle-board 4-2b extends to the noise reduction opening 4-1b of the noise elimination part 4-1 of quiet side from the base portion of the noise elimination part 4-1 of noise side.These first, second sound wave baffle-boards 4-2a, 4-2b have the effect that the noise sound wave that enters in the venting channels 5 is reflected to the 4-1a of the anechoic chamber of noise elimination part 4-1.
First, second sound wave baffle-board 4-2a, 4-2b form its part cross section with ellipse (a part) shape as shown in Figure 2; First focus (representing with f1 among Fig. 2) of this ellipse is set on the noise elimination part opening 4-1b, and second focus (representing with f2 among Fig. 2) is set in the venting channels 5.Through disposing first, second sound wave baffle-board 4-2a, the 4-2b that this cross section is an elliptical shape; Get into the noise sound wave in the venting channels 5 with these first, second sound wave baffle-boards 4-2a, 4-2b reflection with the ventilation air, inner via focus f1 and the f2 guiding 4-1a of anechoic chamber.
The noise elimination part opening 4-1b of the noise elimination part 4-1 of noise side, be formed at end bending to the inside with the plate-shaped member 4-1c of the side that forms this noise elimination part 4-1 more than 90 ° part and with the end bending to the inside of the first sound wave baffle-board 4-2a near between 90 ° the part.Promptly; The end dogleg section of the plate-shaped member 4-1c of the side of usefulness formation noise elimination part 4-1 and the end dogleg section of the first sound wave baffle-board 4-2a are formed for forming the edge of opening of noise elimination part opening 4-1b, and are narrowed down gradually to the inside of noise elimination part 4-1 by the noise elimination part opening 4-1b that these edge of opening form.Therefore, the noise sound wave that forms with first sound wave baffle-board 4-2a reflection and the entering 4-1a of anechoic chamber is difficult to the structure that 4-1a outwards goes out from this anechoic chamber.
Equally; The noise elimination part opening 4-1b of the noise elimination part 4-1 of quiet side, be formed at end bending to the inside with the plate-shaped member 4-1c of the side that forms this noise elimination part 4-1 more than 90 ° part and with the end bending to the inside of the second sound wave baffle-board 4-2b near between 90 ° the part.Promptly; The end dogleg section of the plate-shaped member 4-1c of the side of usefulness formation noise elimination part 4-1 and the end dogleg section of the second sound wave baffle-board 4-2b are formed for forming the edge of opening of noise elimination part opening 4-1b, and are narrowed down gradually to the inside of noise elimination part 4-1 by the noise elimination part opening 4-1b that these edge of opening form.Therefore, the noise sound wave that forms with second sound wave baffle-board 4-2b reflection and the entering 4-1a of anechoic chamber is difficult to the structure that 4-1a outwards goes out from this anechoic chamber.
In Fig. 2; As stated; A focus f1 in two focuses of the ellipse of first, second sound wave baffle-board 4-2a, 4-2b is set in the substantial middle of noise elimination part opening 4-1b, another focus f2 is set near the noise elimination part opening 4-1b in the venting channels 5.But these focuses f1, f2 there is no need necessarily to be set in the position according to shown in Figure 2.For example; Also can a focus f1 be set on the end dogleg section (forming the edge of opening of noise elimination part opening 4-1b) of the plate-shaped member 4-1c of the side that forms noise elimination part 4-1, another focus f2 be set near the noise side ventilation opening 2a in the path of venting channels 5.In a word, an oval focus f1 is set in the nearby position of noise elimination part opening 4-1b, and another focus f2 is set in the path of venting channels 5 and gets final product.
In the left and right sides plate-shaped member of the side of the noise elimination part 4-1 of formation noise side, a plate-shaped member 4-1c who is connected with the second sound wave baffle-board 4-2b makes the punched-plate that is formed with a plurality of punchings.The 4-1a of anechoic chamber and the venting channels 5 that are communicated with noise side noise elimination part 4-1 through this punching.According to this structure; The noise sound wave that gets into and enter into venting channels 5 from noise side ventilation opening 2a produces new sound source with the surface collision of this punched-plate and through Huygen's principle in the part of punching, follows the inside of diffraction phenomena from the punching entering 4-1a of anechoic chamber.Its result can improve the reduction effect of noise energy.
Here, the cross sectional shape to first, second sound wave baffle-board 4-2a, 4-2b describes.Though in example shown in Figure 2, the cross sectional shape of sound wave baffle-board 4-2a, 4-2b is made an oval part; But also can be shown in Fig. 3 A; On flat board, use mould etc. general ellipse is made in the cross section; Perhaps replace, also can be shown in Fig. 3 B, utilize panel beating machinery that flat board is applied Bending Processing a little and the cross section made the sub-elliptical curve that constitutes continuously by short lines.The occasion that the cross section is processed into general elliptic curve (Fig. 3 A) can be in further restricted portion (promptly exactly) set this oval focus f1 and f2; And broaden a little and its profile thickens in the scope of this oval focus f1 of the occasion that the cross section is processed into the sub-elliptical curve (Fig. 3 B), f2; But on the erasure effect this point of utilizing this device to obtain stipulating, be included in the scope that can enough allow.
In addition, there is no need certainly the cross sectional shape of first, second sound wave baffle-board 4-2a, 4-2b is limited to ellipse or sub-elliptical.The cross sectional shape of first, second sound wave baffle-board 4-2a, 4-2b also can adopt the for example curve of circle, parabola, hyperbola and so on, and this occasion gets final product the central point of each curve or the set positions of focus near f1 shown in Figure 2.Have again, also can the cross sectional shape of first, second sound wave baffle-board 4-2a, 4-2b not made curve, and make the shape of flat board being carried out bending in many places.For example, also can flat board be carried out bending and make the roughly cross sectional shape of V font at a place.This occasion because first, second sound wave baffle-board 4-2a, 4-2b do not have focus, though the efficient that therefore the noise sound wave is attracted in the anechoic chamber reduces, does not need the size management of the location and so on of focus, can compare freely and design.
Next explains the action of silencing means shown in Figure 2.The noise sound wave that arrives the wall body that silencing means is installed from the noise source (not shown) of outside gets in the venting channels 5 from the ventilation opening 2a of noise side.The noise sound wave that gets at first produces reflection towards noise elimination part opening 4-1b, the inside of the 4-1a of anechoic chamber of the noise elimination part 4-1 of importing noise side with first sound wave baffle-board 4-2a collision.At this moment, the noise sound wave that has produced reflection partly waits collision and produces new sound source through Huygen's principle with the edge of opening of noise elimination part opening 4-1b, or generation diffraction phenomena etc. and become sound wave the direction of advance disorder state and import in the 4-1a of anechoic chamber.
Then; Enter into the noise sound wave of the 4-1a of anechoic chamber; Thereby in the anechoic chamber through the back wave that the carries out the diffuse reflection phase deviation repeatedly energy of cancelling each other that meets each other; Perhaps the effect owing to damping material 6 reduces the energy that sound wave has, and obtains erasure effect thereby the result reduces the energy of noise sound wave significantly.
Have again; Noise sound wave in noise side ventilation opening 2a enters into venting channels 5; With the noise sound wave of the sheet material parts 4-1c collision of the side that forms noise elimination part 4-1, the punching through punched-plate gets in the 4-1a of anechoic chamber, here with above-mentioned its noise energy of same reduction as stated.
Caught and get into the noise sound wave in the venting channels 5, with the second sound wave baffle-board 4-2b collision of the blade body 4 on the next door that forms this venting channels 5 by the 4-1a of anechoic chamber of the noise elimination part 4-1 of noise side.And; Pass in the 4-1a of anechoic chamber of noise elimination part 4-1 that noise elimination part opening 4-1b enters into the quiet side that is connected with this second sound wave baffle-board 4-2b with the noise sound wave of this second sound wave baffle-board 4-2b reflection, here with the noise energy of above-mentioned this noise sound wave of same reduction.The ventilation of in addition, removing the noise energy of noise sound wave breaks away from quiet side ventilation opening 2b with air and supplies with to the side of main body case 3 3b side.
Claims (5)
1. a silencing means has a plurality of blade bodies of arranging, and has through being formed at the shutter structure that venting channels between these blade bodies and the blade body carries out the ventilation inside and outside the building, it is characterized in that,
Above-mentioned blade body comprises first noise elimination part that is configured in the noise side, the sound wave importing portion that is configured in second noise elimination part of quiet side and links these first and second noise elimination part, and,
Above-mentioned first and second noise elimination part all is made up of hollow structure, in the side space damping material is housed within it, and, be formed with the inner space that is communicated with noise elimination part and the noise elimination part opening in its outside at the position of above-mentioned sound wave importing portion side in each noise elimination part,
Each blade body is configured to; Extend with respect to the direction that the direction vertical with the face of the wall body that silencing means is installed tilts parallel to each other in the length direction axle center of its first noise elimination part and the length direction axle center of second noise elimination part, but axle center relatively another axle center at the left and right directions predetermined distance that squints.
2. silencing means according to claim 1 is characterized in that,
Above-mentioned sound wave importing portion forms with the plate-shaped member with curved surface.
3. silencing means according to claim 2 is characterized in that,
The end that forms the plate-shaped member of above-mentioned sound wave importing portion is fixed in the edge of opening portion of above-mentioned noise elimination part opening.
4. silencing means according to claim 3 is characterized in that,
Above-mentioned noise elimination part opening is to the diminishing shape of the inner space of above-mentioned noise elimination part from its edge of opening portion.
5. silencing means according to claim 1 is characterized in that,
At least a portion apparatus at the position of facing with above-mentioned venting channels in the side of above-mentioned first noise elimination part has the sheet material of sound wave penetrability to constitute.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007029382A JP4919829B2 (en) | 2007-02-08 | 2007-02-08 | Silencer |
| JP2007029382 | 2007-02-08 | ||
| JP2007-029382 | 2007-02-08 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101240684A CN101240684A (en) | 2008-08-13 |
| CN101240684B true CN101240684B (en) | 2012-01-25 |
Family
ID=39755318
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810003068XA Expired - Fee Related CN101240684B (en) | 2007-02-08 | 2008-01-18 | Silencing apparatus |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP4919829B2 (en) |
| CN (1) | CN101240684B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111561252A (en) * | 2020-04-01 | 2020-08-21 | 同济大学 | Broadband ventilation sound insulation window unit structure and application thereof |
| CN111951777B (en) * | 2020-09-11 | 2022-04-26 | 浙江农林大学 | Active magnetic suspension bearing noise elimination device and method |
| CN112318876B (en) * | 2020-10-12 | 2022-07-22 | 李冉 | 3D prints silencing device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000110453A (en) * | 1998-10-06 | 2000-04-18 | Tsukushi Kogyo:Kk | Opening/closing louver |
| JP3263375B2 (en) * | 1999-03-24 | 2002-03-04 | 東京電力株式会社 | Low-noise gully structures in ventilation towers of tunnels. |
| CN1456784A (en) * | 2002-05-10 | 2003-11-19 | 李庚武 | Noise eliminator under natural ventilating status |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS604833A (en) * | 1983-06-23 | 1985-01-11 | Murata Mfg Co Ltd | Temperature sensor |
| JP4292541B2 (en) * | 2003-07-07 | 2009-07-08 | ビーバ株式会社 | Reflector type silencer |
| JP4982165B2 (en) * | 2006-12-07 | 2012-07-25 | エムケー精工株式会社 | Silencer |
-
2007
- 2007-02-08 JP JP2007029382A patent/JP4919829B2/en not_active Expired - Fee Related
-
2008
- 2008-01-18 CN CN200810003068XA patent/CN101240684B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000110453A (en) * | 1998-10-06 | 2000-04-18 | Tsukushi Kogyo:Kk | Opening/closing louver |
| JP3263375B2 (en) * | 1999-03-24 | 2002-03-04 | 東京電力株式会社 | Low-noise gully structures in ventilation towers of tunnels. |
| CN1456784A (en) * | 2002-05-10 | 2003-11-19 | 李庚武 | Noise eliminator under natural ventilating status |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4919829B2 (en) | 2012-04-18 |
| CN101240684A (en) | 2008-08-13 |
| JP2008196124A (en) | 2008-08-28 |
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Granted publication date: 20120125 Termination date: 20190118 |