WO2005073640A1 - 送風ダクトの騒音低減方法 - Google Patents
送風ダクトの騒音低減方法 Download PDFInfo
- Publication number
- WO2005073640A1 WO2005073640A1 PCT/JP2005/001134 JP2005001134W WO2005073640A1 WO 2005073640 A1 WO2005073640 A1 WO 2005073640A1 JP 2005001134 W JP2005001134 W JP 2005001134W WO 2005073640 A1 WO2005073640 A1 WO 2005073640A1
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- WO
- WIPO (PCT)
- Prior art keywords
- duct
- absorbing material
- sound absorbing
- air
- sound
- Prior art date
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/24—Means for preventing or suppressing noise
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/02—Ducting arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/24—Means for preventing or suppressing noise
- F24F2013/242—Sound-absorbing material
Definitions
- the present invention relates to a noise reduction method suitably applied to a ventilation duct for a clean room.
- a clean-norm air conditioner uses a large-sized blower to send a large amount of clean air downstream of a filter, and thus has a problem S that the blower generates a large amount of noise.
- filters have been made thinner in order to reduce the space occupied by filters on the ceiling and to make installation and replacement easier by reducing weight. Reduces the sound insulation of the filter and raises the level of noise heard in the tallin room.
- a fan filter unit is provided in a window hole of a clean room to supply air to the clean room. Also in this case, it is proposed to reduce noise by incorporating a sound absorbing material in the same manner as in the air conditioner.
- Patent Document 1 a fan connection box having an air outlet and a suction port is provided at an appropriate position, and the fan connection box is equipped with a muffling means, and a blow box for connecting a fan to the air inlet.
- a case made of a sound-absorbing material and a baffle plate are installed as sound-absorbing means for the fan connection box.
- the fan is also covered by an outer box made of sound absorbing material.
- Patent Document 2 discloses a filter and a chamber adjacent to the filter for supplying air. In the chamber, a casing having a fan, a fan driving motor and a two-way outlet, and the casing are provided. And a fan filter unit having a diffusion plate made of a punched metal material on the downstream side of the opening, and a porous noise reduction material provided on the shielding plate. Is described.
- Patent Document 3 describes an air purifying apparatus in which an air conditioning mechanism, a blower, a muffling chamber for reducing noise of the blower, and a filter are installed in a box body.
- the bar is connected to a blower similarly to the fan connection box in Patent Document 1, and has a structure in which a silencer is attached to the entire inner surface.
- these units or devices also provide insufficient noise reduction.
- Patent Document 1 JP-A-5-296198
- Patent Document 2 Japanese Patent Application Laid-Open No. 9-310896
- Patent Document 3 JP-A-9-229408
- the present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a method of reducing noise of a ventilation duct which is excellent in noise reduction, economical, and recyclable.
- the inventors of the present invention have conducted intensive studies to achieve the above object, and have found that a sound absorbing material obtained by laminating a skin material on at least one surface of an organic fiber nonwoven fabric is perpendicular to the longitudinal direction of the ventilation duct, and The present inventors have found out that an excellent noise reduction effect can be obtained by installing the skin material surface in the air duct toward the upstream side of the airflow, and arrived at the present invention.
- the present invention is as follows.
- a method for reducing noise in a ventilation duct comprising a step of forming a plate-like or tubular sound-absorbing material having a skin material laminated on at least one surface of an organic fiber nonwoven fabric at a substantially right angle to a longitudinal direction of the duct and the sound-absorbing material.
- a noise reduction method outside the blower which is installed in the blower dart with the surface of the skin facing the upstream of the airflow or the contact side with the airflow,
- the skin material has a particle count of 0.3 zm or more measured based on JIS B 9923.
- the noise of the air duct is easily reduced. Can be effectively reduced.
- the sound-absorbing material has an air contact area on the surface of the skin material that is 1/2 to 4/5 of the cross-sectional area of the duct. Installation at 50 positions is effective for noise reduction.
- the noise reduction effect can be further improved.
- a sound absorbing material whose surface material is dustless paper it is suitable for a clean room where the sound absorbing material does not generate dust.
- a sound absorbing material using alarm paper as dustless paper is a noise reduction method with high strength and excellent durability.
- the air duct include a clean room ⁇ clean bench and a hospital operating room air duct.
- the noise reduction method of the present invention can also be used for fan casings and the like that are connected only with air ducts.
- FIG. 1 is a cross-sectional view showing a layer structure of a sound absorbing material used in the present invention.
- FIG. 2 is a front perspective view of the air duct 1 showing an embodiment in which one sheet-shaped sound absorbing material is installed at a position near an air inlet on the inner surface of a box-shaped air duct.
- FIG. 3 is a perspective view showing a mode in which a semicircular sound absorbing material is installed on the inner surface of a cylindrical duct.
- FIG. 4 is a front perspective view of a duct showing a mode in which a sound absorbing material is lined on the inner wall of a box-shaped duct and three plate-shaped sound absorbing materials are installed inside.
- FIG.5 Three cylindrical sound absorbers were installed in three rows with three spaces each, so that the air inside the air flowed around the cylindrical sound absorbers, and the ducts were lined with sound absorbers. It is a front view of the ventilation duct which shows an aspect.
- FIG. 6 is a front perspective view of the air duct shown in FIG. 5.
- FIG. 7 is a front view of a ventilation duct showing an embodiment in which two cylindrical sound absorbing materials are installed and the sound absorbing materials are lined.
- FIG. 1 is a cross-sectional view showing a layer structure of a sound absorbing material used in the present invention.
- the sound absorbing material 2 is formed by laminating a skin material 21 and an organic fiber nonwoven fabric 22. The material and characteristics of the sound absorbing material will be described later.
- FIG. 2 to FIG. 4 are diagrams showing a preferred embodiment in which a plate-like sound absorbing material is installed in a ventilation duct.
- FIG. 5 to FIG. 7 are views showing a preferred embodiment in which a tubular sound absorbing material is installed in an air duct. Note that the following installation shows a preferred embodiment of the present invention, and the present invention is not limited to this.
- FIG. 2 shows an embodiment in which a plate-shaped sound absorbing material 2 is installed in a box-shaped air duct 1 at positions of the air inlets 11 to 25 where the total length of the duct is 100, and In front perspective view is there.
- the sound absorbing material 2 is plate-shaped, and has the same height as the height h of the inner surface of the duct, and is cut into a width L of about 70% of the width of the inner surface of the duct.
- the sound absorbing material 2 is installed so that the air inlet 11 side, i.e., the skin material surface 21 on the upstream side of the air flow, and the non-woven fabric surface 22 on the air outlet 12 side, and are fitted substantially perpendicular to the longitudinal direction of the duct. .
- FIG. 3 shows an embodiment in which one semicircular sound absorbing material is installed along the inner surface of the cylindrical duct 1.
- the sound-absorbing material 2 is cut into a semicircle in accordance with the inside diameter of the duct, and the skin material surface 21 is on the upstream side of the airflow, and is approximately perpendicular to the longitudinal direction of the duct. It is installed on the 11 side.
- FIG. 4 is a front perspective view of a duct showing a mode in which a sound absorbing material 2 is lined on the inner wall of a box-shaped duct, and three plate-shaped sound absorbing materials are installed inside.
- the duct is omitted.
- Each of the three sound absorbing materials 2 is cut into a plate shape having substantially the same height as the inner surface of the duct and a width of about 70%.
- the sound-absorbing material 2 is disposed at a position perpendicular to the longitudinal direction of the duct, with the skin surface 21 being on the upstream side of the airflow, and at positions 25, 50, and 75, respectively, assuming that the total length of the duct from the air inlet 11 is 100. ing.
- the inflowing air is discharged through the air outlet 12 while bypassing the three plate-shaped sound absorbing materials.
- FIG. 5 is a front view of a blower duct showing an example in which cylindrical sound absorbing materials in which a sound absorbing material 2 is wound around an aluminum pipe 3 are arranged in three rows in a horizontal direction. It is wound so that the skin surface 21 of the sound absorbing material 2 becomes the surface of the cylindrical sound absorbing material.
- FIG. 6 is a front perspective view of the air duct shown in FIG. In FIGS. 5 and 6, the duct frame is not shown.
- Each sytem IJ has nine cylindrical sound absorbing materials installed, three in the vertical direction.
- the cylindrical sound-absorbing material is installed at a position substantially perpendicular to the longitudinal direction of the duct and at positions 20, 50, and 75, respectively, when the total length of the duct from the air inlet 11 is 100.
- the air in the duct flows while bypassing the cylindrical sound absorbing material.
- the sound absorbing material 2 is lined on the inner wall of the duct. Note that the cylindrical sound absorbing material may be rotated 90 ° in the vertical direction in FIG. 5 and installed three in three vertical rows.
- FIG. 7 shows a case where the sound absorbing material 2 is lined on the inner wall of the duct, and the total length of the duct is set to 100 from the air inlet 11.
- FIG. 11 is a front view of a blower duct showing an aspect in which two cylindrical sound absorbing members are arranged vertically at approximately the center of the height of the duct at the position of 20 at substantially 20 and at a right angle to the longitudinal direction of the duct.
- the contact area with the air flowing through the duct can be widened and the noise reduction effect can be enhanced.
- substantially right angle means that the force is within the range of 90 ° force and 510 °.
- the sound absorbing material a plate-like material and a tubular material may be used in combination, and the number of sound absorbing materials is not limited.
- the shape of the air duct is not limited.
- a sound absorbing material 2 obtained by laminating a skin material 21 and a nonwoven fabric 22 is wound in a plate shape or a mandrel or a pipe.
- the air duct is installed in the air duct 1 at a right angle to the longitudinal direction of the duct, with the skin facing toward the upstream side of the air flow or the contact surface with the air flow. The ability to reduce power S can be achieved.
- At least one sound absorbing material is preferably installed at a position 20 to 50 from the air inlet when the total length of the air duct is 100.
- the sound absorbing material preferably has a contact area of the surface of the skin material with air which is 1/2 to 4/5 of a sectional area of the duct. In the case of a plate-shaped sound-absorbing material with skin material on both sides, it is the contact area on one side.
- the sound absorbing material 2 a laminate obtained by laminating a skin material 21 on at least one surface of an organic fiber nonwoven fabric 22 is used, but if the skin material 21 is dustless paper, the sound absorbing material emits light. Suitable for clean room ventilation ducts due to low dust.
- dust-free paper dust-free paper having a particle count of 0.3 zm or more and 500 or less, measured based on JIS B 9923, is preferable because it generates less dust. In order to reduce dust generation in the clean room, the number of generated dust is more preferably 100 or less, particularly preferably 50 or less.
- the sound absorbing material 2 taking into account the sound absorbing performance, Shi preferred that aeration amount of dust-free paper is skin material is not more than lOcc / cm 2 'sec les. More preferably 'following sec, particularly preferably air permeability 2 cc / cm 2' is 5 cc / cm 2 air permeability good equal to or less than sec les.
- the ventilation volume is J This is a value measured based on IS L 1096.
- the form of the dust-free paper may be various forms such as paper, film, nonwoven fabric (dry type and wet type).
- Examples of the paper-type dust-free paper include impregnated paper made of natural pulp such as NBKP and LBKP, and, if necessary, a regular paper using a filler and fibers fixed with a resin such as a synthetic resin emulsion. Can be mentioned.
- commercially available dust-free paper for example, “OK Clean Paper” (trade name, manufactured by Fuji Paper) can be used as it is.
- the film-type dust-free paper is obtained by melting and extruding a raw material in which an inorganic filler and an additive are mixed with a main raw material such as a polypropylene resin by an extruder and stretching in a longitudinal direction to form a base layer. It is obtained by a method such as a method of melt extrusion from a laminating layer extruder, laminating on the front and back surfaces of the base layer to form a three-layer structure, and stretching in the lateral direction.
- the nonwoven fabric type dustless paper may be composed of either staples or filaments.
- nonwoven fabrics composed of thermoplastic long fibers such as polyethylene and polyester are also preferably used.
- a spunbond method a thermal bond method in which fibers are partially adhered to each other, is preferred in terms of sound absorption.
- a commercially available nonwoven fabric for example, “Axter” (trade name, manufactured by Toray Seki) can be used as it is.
- a wet nonwoven fabric made of short fibers such as paper or felt made of chopped fiber, pulp and staple, etc. is preferably used.
- a commercially available nonwoven fabric for example, a product name “KEVLER100% paper” (manufactured by Oji Paper Co., Ltd.) can be used as it is.
- paper or wet non-woven type dust-free paper is preferred, and particularly wet-type non-woven type dust-free paper is preferable because of its good sound absorption characteristics and low dust generation.
- wet nonwoven type dust-free paper aramide paper made from aramide fiber is excellent in durability and is preferably used.
- the organic fiber nonwoven fabric constituting the sound absorbing material may be a short fiber nonwoven fabric or a long fiber nonwoven fabric, or may be any one of them.
- a needle punched nonwoven fabric a water jet punched nonwoven fabric, a melt blown nonwoven fabric, a spun bond nonwoven fabric, and the like. Is mentioned.
- polyester fibers are preferred among synthetic fibers.
- Thermoplastic fibers such as fibers, polyamide fibers, acrylic fibers, polypropylene fibers, and polyethylene fibers; and those obtained by manufacturing the fiber material according to a known method such as wet spinning, dry spinning, or melt spinning. can do.
- polyester fibers, polypropylene fibers, and nylon fibers are preferred because of their excellent durability and abrasion resistance. These fibers may be used alone, or may be mixed at an arbitrary ratio.
- polyester fibers are most preferable because the raw material polyester can be easily recycled by heat melting of the waste nonwoven fabric, the economic efficiency is excellent, and the texture of the nonwoven fabric is excellent, and the moldability is excellent. Some or all of these thermoplastic fibers may be anti-hair (recovered and regenerated fibers).
- the polyester fiber described above is a polyester fiber composed of dicarboxylic acid and dalicol having ethylene terephthalate as a main repeating unit, and the dicarboxylic acid components are terephthalic acid, 2, 6-naphthalenedicarboxylic acid, and isophthalic acid. , 1,4-cyclohexanedicarboxylic acid and the like.
- the glycol component include ethylene glycol, propylene glycol, tetramethylene glycol, 1,3-propanediol, 1,4-butanediol, and 1,4-cyclohexanedimethanol.
- the fiber length and fineness of the thermoplastic fiber are not particularly limited, but the fiber length is preferably 10 mm or more.
- Thermoplastic fibers may be long fibers (filaments) or short fibers (stable), but in the case of short fibers, the fiber length is preferably 10-100 mm, especially 20-80 mm.
- short fibers having a fiber length of 10 mm or more it is difficult for the short fibers to fall off the nonwoven fabric, and from the viewpoint of workability, it is preferable that the length be 100 mm or less.
- the fineness is preferably 0.5-30 dtex, especially 1.0-lOdtex.
- thermoplastic short fibers can be used alone or in combination of two or more. It is also possible to mix and use thermoplastic short fibers of the same type or different types with different fineness and fiber length. In this case, the mixing ratio of the fibers is arbitrary and can be appropriately determined according to the use and purpose of the nonwoven fabric.
- Nonwoven fabrics using a combination of thermoplastic fibers and heat-resistant fibers can also be used.
- the heat-resistant fibers include, for example, aramide fibers, polyphenylene sulfide fibers, polybenzoxazole fibers, and polybenzoxazole fibers.
- One or more organic fibers selected from teretherketone fibers, polyarylate fibers, polyimide fibers, fluorine fibers and flame-resistant fibers can be mentioned.
- para-aramid fibers are particularly preferred in that heat shrinkage, which is preferred by aramid fibers, is small.
- para-aramid fiber examples include polyparaffin perylene phthalamide fiber (trade name “KEVLAR” (registered trademark) manufactured by Dubon Corporation of the United States and Du Pont-Toray Co., Ltd.); Commercially available products such as oxydiphenylene terephthalamide fiber (manufactured by Teijin Limited, trade name “Technola” (registered trademark)) and the like.
- the fiber length and fineness of the heat-resistant fiber are not particularly limited, but the fineness is preferably 0.5-3 Odtex, and particularly preferably 1.0-lOdtex, and the fiber length is 20%. — Short fibers of 100 mm, especially 40-80 mm, are preferred.
- the ratio of thermoplastic short fiber / heat-resistant short fiber is preferably 95/5 to 55/45 (mass ratio).
- the ratio (mass ratio) of thermoplastic short fiber / heat-resistant short fiber is more preferably 88 / 12-65 / 35, and further preferably 85 / 15-65 / 35.
- power S desiring There is power S desiring.
- thermoplastic fiber examples include one or more fibers selected from the above-mentioned polyester fibers, polypropylene fibers, polyethylene fibers, linear low-density polyethylene fibers, ethylene-butyl acetate copolymer fibers, and the like. Can be.
- the laminating method of the skin material (for example, dust-free paper) and the non-woven fabric includes fusion, stitching, bonding with an adhesive, hot embossing, ultrasonic bonding, sinter bonding with an adhesive resin, and bonding with a heat bonding sheet. What is bonded and laminated by a general-purpose method such as bonding with a welder is used. Above all, heat-melting adhesive powder or heat-bondable low-melting fiber, low-melting film, low-melting net, low-melting nonwoven fabric, etc. are sandwiched between the skin material and the nonwoven fabric and heat-treated to produce a low-melting material. A material obtained by melting and partially bonding the nonwoven fabric and the skin material is excellent in noise reduction and is preferred.
- the air duct noise reduction method of the present invention can be widely applied to air duct noise reduction. You can. It can be used to reduce the noise of air ducts for clean rooms such as factories in the semiconductor industry, precision machinery industry, photography industry, pharmaceutical industry, and food industry, and can be applied to the air vents of clean benches or clean booths to reduce the noise. Can be measured.
- a box with dimensions of S315mm X 165mm X 165mm was created.
- the sound absorbing material obtained in Reference Example 1 was applied to all the walls. Lining with the skin side facing up, and the same sound absorbing material 165mm x 100
- the plate-shaped sound-absorbing material obtained by cutting into a size of mm is installed at a position perpendicular to the long side of the bottom plate of the box, with the surface of the skin material facing the air inlet and within 75 mm from the air inlet.
- a sound absorbing box with the structure shown in Fig. 2 was created.
- the dimensions of the inner surface of the box after lining were 300 mm x 140 mm x 140 mm.
- the sound-absorbing material obtained in Reference Example 1 was lined on the inner wall of the same sound-absorbing box created in Example 1 in the same manner as in Example 1, and three sheets of the same size as those used in Example 1 were separately used. After cutting, both were installed at a right angle to the long side of the box, and were placed 75 mm, 155 mm, and 235 mm from the air inlet so that the surface of the skin was on the air inlet side.
- a sound-absorbing box having the structure shown in FIG. 1 was obtained, and the volume from the hair dryer was measured in the same manner as in Example 1. As a result, it was 86.4 dB.
- Example 3 The two pipe-shaped sound-absorbing materials created in Example 3 were placed side by side in a sound-absorbing box lined with sound-absorbing material at the position of 65 mm in the air inflow locus, almost at the height of the center as in Example 2. Thus, a sound absorbing box having the structure shown in FIG. 7 was created. The volume measured in the same manner as in Example 1 was 87. OdB.
- Example 4 the same sound absorbing box as in Example 4 was created except that the installation position of the cylindrical sound absorbing material was 235 mm from the air inlet, and the sound volume was measured in the same manner.
- the volume from the hair dryer of the sound-absorbing box without lining created in Example 1 was 101.6 dB.
- the present invention is useful for reducing the noise of the air duct.
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Abstract
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Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2004019262A JP2007187324A (ja) | 2004-01-28 | 2004-01-28 | 送風ダクトの騒音低減方法 |
JP2004-019262 | 2004-01-28 |
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WO2005073640A1 true WO2005073640A1 (ja) | 2005-08-11 |
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PCT/JP2005/001134 WO2005073640A1 (ja) | 2004-01-28 | 2005-01-27 | 送風ダクトの騒音低減方法 |
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JP2008185014A (ja) * | 2007-01-31 | 2008-08-14 | Hitachi Industrial Equipment Systems Co Ltd | 機械の低騒音パッケージ |
WO2009041937A1 (en) | 2007-09-25 | 2009-04-02 | Carrier Corporation | Sound attenuator for a fan coil |
ITBO20100667A1 (it) * | 2010-11-08 | 2012-05-09 | Dani System S R L | Dispositivo a condotto silenziato |
CN103206761A (zh) * | 2013-04-25 | 2013-07-17 | 广州京诚检测技术有限公司 | 一种延时式高效消声换气装置及方法 |
WO2014128040A1 (en) * | 2013-02-19 | 2014-08-28 | Vkr Holding A/S | Attenuator for ventilation duct |
CN105066415A (zh) * | 2015-08-06 | 2015-11-18 | 荣成同方节能服务有限公司 | 一种空气源机组专用降噪装置 |
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WO2023232508A1 (en) * | 2022-05-30 | 2023-12-07 | Bdr Thermea Group B.V. | An acoustic baffle for an exhaust duct of a heat pump system |
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Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2008185014A (ja) * | 2007-01-31 | 2008-08-14 | Hitachi Industrial Equipment Systems Co Ltd | 機械の低騒音パッケージ |
EP2198205A4 (en) * | 2007-09-25 | 2014-04-09 | Carrier Corp | MUFFLER FOR A FAN CONVECTOR |
WO2009041937A1 (en) | 2007-09-25 | 2009-04-02 | Carrier Corporation | Sound attenuator for a fan coil |
EP2198205A1 (en) * | 2007-09-25 | 2010-06-23 | Carrier Corporation | Sound attenuator for a fan coil |
ITBO20100667A1 (it) * | 2010-11-08 | 2012-05-09 | Dani System S R L | Dispositivo a condotto silenziato |
WO2014128040A1 (en) * | 2013-02-19 | 2014-08-28 | Vkr Holding A/S | Attenuator for ventilation duct |
CN103206761A (zh) * | 2013-04-25 | 2013-07-17 | 广州京诚检测技术有限公司 | 一种延时式高效消声换气装置及方法 |
CN103206761B (zh) * | 2013-04-25 | 2015-05-06 | 广州京诚检测技术有限公司 | 一种延时式高效消声换气装置及方法 |
CN105066415A (zh) * | 2015-08-06 | 2015-11-18 | 荣成同方节能服务有限公司 | 一种空气源机组专用降噪装置 |
CN105066415B (zh) * | 2015-08-06 | 2017-09-26 | 荣成同方节能服务有限公司 | 一种空气源机组专用降噪装置 |
US11066084B2 (en) * | 2016-06-03 | 2021-07-20 | Kawasaki Jukogyo Kabushiki Kaisha | Railcar air-conditioning duct |
US11353239B2 (en) * | 2019-08-28 | 2022-06-07 | Broan-Nutone Llc | Sound reduction grille assembly |
WO2023232508A1 (en) * | 2022-05-30 | 2023-12-07 | Bdr Thermea Group B.V. | An acoustic baffle for an exhaust duct of a heat pump system |
EP4350243A1 (en) * | 2022-10-04 | 2024-04-10 | BDR Thermea Group B.V. | An acoustic baffle for an exhaust duct of a heat pump system |
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