EP0236810B1 - Absorbing sound-damping structure - Google Patents
Absorbing sound-damping structure Download PDFInfo
- Publication number
- EP0236810B1 EP0236810B1 EP87102341A EP87102341A EP0236810B1 EP 0236810 B1 EP0236810 B1 EP 0236810B1 EP 87102341 A EP87102341 A EP 87102341A EP 87102341 A EP87102341 A EP 87102341A EP 0236810 B1 EP0236810 B1 EP 0236810B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- film
- absorption
- damping structure
- damping
- supporting structure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000013016 damping Methods 0.000 title claims abstract description 13
- 238000010521 absorption reaction Methods 0.000 claims abstract description 33
- 239000000463 material Substances 0.000 claims abstract description 21
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 239000004033 plastic Substances 0.000 claims description 4
- 229920003023 plastic Polymers 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 2
- 239000004411 aluminium Substances 0.000 claims 1
- 239000000428 dust Substances 0.000 abstract description 7
- 238000010276 construction Methods 0.000 abstract 2
- 239000000853 adhesive Substances 0.000 abstract 1
- 230000001070 adhesive effect Effects 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 11
- 230000003584 silencer Effects 0.000 description 9
- 238000010030 laminating Methods 0.000 description 6
- 239000011888 foil Substances 0.000 description 3
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 239000011490 mineral wool Substances 0.000 description 3
- 239000004800 polyvinyl chloride Substances 0.000 description 3
- 229920000915 polyvinyl chloride Polymers 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910000737 Duralumin Inorganic materials 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000011491 glass wool Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000002557 mineral fiber Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 239000005871 repellent Substances 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 239000013464 silicone adhesive Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
Definitions
- the invention relates to an absorption silencer backdrop.
- Such absorption silencers are suitable for the damping of sound waves in flowing gases containing moisture dust, which tends to stick.
- an absorption silencer backdrop which has an absorption plate held by a backdrop frame, the absorption material being coated with a binder in order to stabilize the fibers on the surface of the absorption material.
- the AU-A-407 054 also shows an absorption silencer backdrop.
- a thin material such as a film, is applied directly to the surface of the absorption material.
- the object of the present invention is to dampen the sound waves in a moist and dusty flowing gas in a wide frequency range, the associated Absorption muffler backdrop should also be used in moist gases that tend to stick to dust, without the effectiveness of the muffler being reduced due to the deposits of dust particles.
- the absorption silencer backdrop is described by the features of claim 1.
- the absorption silencer backdrop according to the invention comprises, as is customary in the case of such backdrops, a backdrop frame which can consist, for example, of metal, such as steel or aluminum, or of plastic.
- a backdrop frame which can consist, for example, of metal, such as steel or aluminum, or of plastic.
- the usual precautions can be taken on the link frame (profile frame), which facilitate the assembly and sealing of the silencer link at the place of action; it can contain, for example, bores with or without threads, mounting brackets, rails, seals, such as, for example, rubber-elastic or spring-elastic sealing lips.
- the absorption material which usually consists of rock, mineral or glass wool, is located within the backdrop frame; other absorption materials are conceivable, but mostly less inexpensive. The absorption material is held down by a support structure without being firmly connected to it.
- a film is firmly connected to the support structure.
- This film can be glued to the support structure.
- the laminating film and the support structure can also consist of one piece; the laminating film can be provided with a support structure during the manufacturing process, for example with ribs and the like.
- the support structure should not only hold down the absorbent material, it also has the task of the lamination film with the it is firmly connected to give sufficient support, for example to prevent destruction by excessive fluttering of the film at high flow velocities of the gas in which the sound waves are to be damped.
- the support structure can consist of the same material as the laminating film, but it can also consist of one or more other materials. Examples of usable materials are metals and their alloys, such as. As aluminum, aluminum alloy such as duralumin and steels, and their mixtures.
- the support structure can for example have the shape of a perforated plate, a grid or one or more strips or ribs. The support structure should only cover a small proportion of the inner surface of the film. If it is not provided with a support structure during its manufacturing process, the laminating film can, for example, be glued, welded or sintered onto the support structure.
- the laminating film In order to achieve good sound absorption, the laminating film must be largely transparent to the sound waves to be damped.
- the laminating film can be a thin metal film, but it can also consist of plastic, for example polyethylene, PVC or PTFE.
- plastic for example polyethylene, PVC or PTFE.
- the film is essentially smooth on the gas side in order not to promote the agglomeration of sticky particles on its surface. In the same sense, bumps on the gas side, such as screw or rivet heads resting on the film, should be avoided. So that the sound waves can penetrate the absorption material largely unhindered, the film is only firmly connected to the support structure with a small part of its surface facing away from the gas side.
- the Foil coated on the gas side or chemically or physically modified for example to increase their corrosion resistance or their liability-repellent effect.
- FIGS. 1a, b A special embodiment of the device according to the invention is outlined in FIGS. 1a, b.
- the film 1 is an approximately 50 ⁇ m thick PTFE film.
- the film is attached to a 3 mm thick perforated plate 2 made of PVC using a silicone adhesive.
- the absorption silencer backdrop has the outer dimensions 1000 mm x 1000 mm.
- Each of the two perforated plates has 52 circular openings 5 of 118 mm in diameter.
- the absorption material 4 consists of mineral wool, the backdrop frame 3 made of aluminum.
- the perforated plates are connected to the backdrop frame by rivets (Fig.1a), the joints are sealed with sealing compound.
- the insertion loss of silencers (cf. VDI 2567) with the described scenes corresponds to the insertion loss of silencers with scenes, the absorption material of which is covered with a similar film, but is held on the outside by a grille.
- the backdrop described was used for 2 1/2 years in humid air containing PVC dust or the like. Flow rate operated. There was no significant dust deposit on the backdrop. The insertion loss did not change.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Building Environments (AREA)
- Laminated Bodies (AREA)
- Exhaust Silencers (AREA)
- Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)
Abstract
Description
Die Erfindung betrifft eine Absorptionsschalldämpferkulisse. Derartige Absorptionsschalldämpferkulissen sind für die Dämpfung von Schallwellen in zum Kleben neigenden Feuchtstaub enthaltenden strömenden Gasen geeignet.The invention relates to an absorption silencer backdrop. Such absorption silencers are suitable for the damping of sound waves in flowing gases containing moisture dust, which tends to stick.
Im Merkblatt "Relaxationsschalldämpfer-Elemente Typ F" vom 05. April 1980 der Firma G+H Montage, D-6700 Ludwigshafen sind Kulissen aus mit strukturierter Metallfolie kaschierten Mineralfaserplatten beschrieben, die eine hohe Dämmung im Frequenzbereich um 250 Hz haben. Auf Seite 2, mittlere Spalte dieses Merkblattes ist erwähnt, daß der Einsatz dieser Kulisse in feuchten oder staubhaltigen Medien möglich sei, "sofern die Staubbestandteile nicht zum Kleben neigen." Im Merkblatt "Relaxations-Schalldämpfer-Elemente Typ R'' vom 06. November 1980, herausgegeben von der gleichen Firma wie o.g. Merkblatt, wird für den Einsatz bei feuchten und staubigen Medien die Abdeckung des Absorptionsmaterials durch Folie, die durch ein. Drahtgitter niedergehalten wird, empfohlen.In the leaflet "Relaxation silencer elements type F" dated April 5, 1980 by G + H Montage, D-6700 Ludwigshafen, backdrops made of mineral fiber panels laminated with structured metal foil are described, which have high insulation in the frequency range around 250 Hz. On
Aus der FR-A-2 420 080 ist eine Absorptionsschalldämpferkulisse bekannt, die eine von einem Kulissenrahmen gehaltene Absorptionsplatte aufweist, wobei das Absorptionsmaterial mit einem Bindemittel beschichtet ist, um die Fasern auf der Oberfläche des Absorptionsmaterials zu stabilisieren.From FR-A-2 420 080 an absorption silencer backdrop is known which has an absorption plate held by a backdrop frame, the absorption material being coated with a binder in order to stabilize the fibers on the surface of the absorption material.
Auch die AU-A-407 054 zeigt eine Absorptionsschalldämpferkulisse. Dabei ist ein dünnes Material, wie eine Folie, direkt auf der Oberfläche des Absorptionsmaterials aufgebracht.The AU-A-407 054 also shows an absorption silencer backdrop. A thin material, such as a film, is applied directly to the surface of the absorption material.
Aufgabe der vorliegenden Erfindung ist es, die Schallwellen in einem feuchten und staubigen strömenden Gas in einem weiten Frequenzbereich zu dämpfen, wobei die zugehörige Absorptionsschalldämpferkulisse auch in feuchten, zum Kleben neigenden Staub enthaltenden Gasen eingesetzt werden soll, ohne daß die Wirksamkeit des Schalldämpfers aufgrund der Ablagerungen von Staubteilchen gemindert wird.The object of the present invention is to dampen the sound waves in a moist and dusty flowing gas in a wide frequency range, the associated Absorption muffler backdrop should also be used in moist gases that tend to stick to dust, without the effectiveness of the muffler being reduced due to the deposits of dust particles.
Die Absorptionsschalldämpferkulisse ist durch die Merkmale von Anspruch 1 beschrieben.The absorption silencer backdrop is described by the features of
Die erfindungsgemäße Absorptionsschalldämpferkulisse umfaßt, wie bei solchen Kulissen üblich, einen Kulissenrahmen, der beispielsweise aus Metall, wie Stahl oder Aluminium, oder aus Kunststoff bestehen kann. Am Kulissenrahmen (Profilrahmen) können die üblichen Vorkehrungen getroffen sein, die die Montage und Abdichtung der Schalldämpferkulisse am Wirkungsort erleichtern; er kann beispielsweise Bohrungen mit oder ohne Gewinde, Montagelaschen, Schienen, Dichtungen, wie beispielsweise gummielastische oder federelastische Dichtungslippen enthalten. Innerhalb des Kulissenrahmens befindet sich das Absorptionsmaterial, das üblicherweise aus Stein-, Mineral- oder Glaswolle besteht; andere Absorptionsmaterialien sind denkbar, jedoch meist weniger preisgünstig. Das Absorptionsmaterial wird durch eine Stützkonstruktion niedergehalten ohne damit fest verbunden zu sein. An der Gasseite der Stützkonstruktion, d.h. an der Seite, an der sich nach Einbau der Kulisse am Wirkort das strömende Gas befindet, dessen Schallwellen gedämpft werden sollen, ist eine Folie mit der Stützkonstruktion fest verbunden. Diese Folie kann auf die Stützkonstruktion geklebt sein. Die Kaschierfolie und die Stützkonstruktion können auch aus einem Stück bestehen; so kann die Kaschierfolie von vornherein während ihres Herstellungsprozesses mit einer Stützkonstruktion versehen sein, beispielsweise mit Rippen u.ä. Die Stützkonstruktion soll nicht nur das Absorptionsmaterial niederhalten, sie hat vielmehr auch die Aufgabe, der Kaschierfolie, mit der sie fest verbunden ist, ausreichenden Halt zu geben, beispielsweise um eine Zerstörung durch übermäßiges Flattern der Folie bei hohen Strömungsgeschwindigkeiten des Gases, in dem die Schallwellen gedämpft werden sollen, zu verhindern. Begrenzte Bewegungen der Folie zwecks Selbstreinigung und akustischer Transparenz sind erwünscht. Die Stützkonstruktion kann aus dem selben Material wie die Kaschierfolie bestehen, sie kann aber auch aus einem oder mehreren anderen Materialien bestehen. Beispiele für verwendbare Materialien sind Metalle und deren Legierungen, wie z. B. Aluminium, Aluminiumlegierung, wie Duraluminium und Stähle, sowie deren Mischungen. Die Stützkonstruktion kann beispielsweise die Form einer Lochplatte, eines Gitters oder eines oder mehrerer Leisten oder Rippen haben. Die Stützkonstruktion sollte nur einen geringen Anteil der Folieninnenfläche abdecken. Sofern sie nicht während ihres Herstellungsprozesses mit einer Stützkonstruktion versehen ist, kann die Kaschierfolie beispielsweise mit der Stützkonstruktion verklebt, verschweißt sein oder aufgesintert sein. Um eine gute Schalldämpfung zu erzielen, muß die Kaschierfolie weitgehend transparent für die zu dämpfenden Schallwellen sein. Die Kaschierfolie kann eine dünne Metallfolie sein, sie kann aber auch aus Kunststoff, beispielsweise Polyethylen, PVC oder PTFE bestehen. Bei der Wahl des geeigneten Werkstoffs sind die Temperatur und das chemische Verhalten der Gase, in denen der Schall gedämpft werden soll, zu berücksichtigen. Die Folie ist an der Gasseite im wesentlichen glatt, um die Agglomeration klebriger Teilchen an ihrer Oberfläche nicht zu begünstigen. Im gleichen Sinne sollten Unebenheiten an der Gasseite, etwa durch der Folie aufliegende Schrauben- oder Nietenköpfe,vermieden werden. Damit die Schallwellen weitgehend ungehindert durch die Folie in das Absorptionsmaterial eindringen können, ist die Folie nur mit einem geringen Teil ihrer von der Gasseite abgekehrten Fläche mit der Stützkonstruktion fest verbunden. Obwohl für die erfindungsgemäße Wirkung nicht erforderlich, kann die Folie an der Gasseite beschichtet oder chemisch oder physikalisch modifiziert sein, um beispielsweise ihre Korrosionsbestandigkeit oder ihre haftungsabweisende Wirkung zu erhöhen.The absorption silencer backdrop according to the invention comprises, as is customary in the case of such backdrops, a backdrop frame which can consist, for example, of metal, such as steel or aluminum, or of plastic. The usual precautions can be taken on the link frame (profile frame), which facilitate the assembly and sealing of the silencer link at the place of action; it can contain, for example, bores with or without threads, mounting brackets, rails, seals, such as, for example, rubber-elastic or spring-elastic sealing lips. The absorption material, which usually consists of rock, mineral or glass wool, is located within the backdrop frame; other absorption materials are conceivable, but mostly less inexpensive. The absorption material is held down by a support structure without being firmly connected to it. On the gas side of the support structure, that is to say on the side on which the flowing gas whose sound waves are to be damped is located after installation of the backdrop at the site of action, a film is firmly connected to the support structure. This film can be glued to the support structure. The laminating film and the support structure can also consist of one piece; the laminating film can be provided with a support structure during the manufacturing process, for example with ribs and the like. The support structure should not only hold down the absorbent material, it also has the task of the lamination film with the it is firmly connected to give sufficient support, for example to prevent destruction by excessive fluttering of the film at high flow velocities of the gas in which the sound waves are to be damped. Limited movements of the film for self-cleaning and acoustic transparency are desirable. The support structure can consist of the same material as the laminating film, but it can also consist of one or more other materials. Examples of usable materials are metals and their alloys, such as. As aluminum, aluminum alloy such as duralumin and steels, and their mixtures. The support structure can for example have the shape of a perforated plate, a grid or one or more strips or ribs. The support structure should only cover a small proportion of the inner surface of the film. If it is not provided with a support structure during its manufacturing process, the laminating film can, for example, be glued, welded or sintered onto the support structure. In order to achieve good sound absorption, the laminating film must be largely transparent to the sound waves to be damped. The laminating film can be a thin metal film, but it can also consist of plastic, for example polyethylene, PVC or PTFE. When choosing the suitable material, the temperature and the chemical behavior of the gases in which the sound is to be damped must be taken into account. The film is essentially smooth on the gas side in order not to promote the agglomeration of sticky particles on its surface. In the same sense, bumps on the gas side, such as screw or rivet heads resting on the film, should be avoided. So that the sound waves can penetrate the absorption material largely unhindered, the film is only firmly connected to the support structure with a small part of its surface facing away from the gas side. Although not necessary for the effect according to the invention, the Foil coated on the gas side or chemically or physically modified, for example to increase their corrosion resistance or their liability-repellent effect.
In den Figuren 1a,b ist eine besondere Ausführungsform der erfindungsgemäßen Vorrichtung skizziert. Die Folie 1 ist eine ca. 50 um starke PTFE-Folie. Die Folie ist mittels eines Silikonklebers auf einer 3 mm starken Lochplatte 2 aus PVC befestigt. Die Absorptionsschalldämpferkulisse hat die Außenmaße 1000 mm x 1000 mm.
Jede der beiden Lochplatten besitzt 52 kreisrunde Öffnungen 5 von 118 mm Durchmesser. Das Absorptionsmaterial 4 besteht aus Mineralwolle, der Kulissenrahmen 3 aus Aluminium Die Lochplatten sind mit dem Kulissenrahmen durch Nieten (Fig.1a) verbunden, die Fugen mit Dichtmasse verschlossen.A special embodiment of the device according to the invention is outlined in FIGS. 1a, b. The
Each of the two perforated plates has 52
Die Einfügungsdämpfung von Schalldämpfern (vgl. VDI 2567) mit den beschriebenen Kulissen entspricht der Einfügungsdämpfung von Schalldämpfern mit Kulissen, deren Absorptions-Material mit gleichartiger Folie abgedeckt, aber außen von einem Gitter gehalten wird.The insertion loss of silencers (cf. VDI 2567) with the described scenes corresponds to the insertion loss of silencers with scenes, the absorption material of which is covered with a similar film, but is held on the outside by a grille.
Die beschriebene Kulisse wurde 2 1/2 Jahre lang in feuchter, PVC-Staub enthaltender Luft o. g. Strömungsgeschwindigkeit betrieben. Es erfolgte keine nennenswerte Staubablagerung auf der Kulisse. Die Einfügungsdämpfung veränderte sich nicht.The backdrop described was used for 2 1/2 years in humid air containing PVC dust or the like. Flow rate operated. There was no significant dust deposit on the backdrop. The insertion loss did not change.
Claims (8)
- Absorption sound-damping structure having an absorption material (4) enclosed by a circumferential structure frame (3), which material is covered by a supporting structure (2) and a film (1) on the surfaces not enclosed by the structure frame (3), having the following features:1.1 the supporting structure (2) is connected to the structure frame (3) and is arranged in such a way that it holds the absorption material (4) down without being firmly connected thereto,1.2 the film (1) is firmly connected to the supporting structure (2) at the side of the supporting structure (2) at which there is located a flowing gas after the installation of the absorption sound-damping structure at the working site,1.3 the supporting structure (2) is formed in such a way that it only covers a small part of the inner face of the film (1),1.4 the film (1) is smooth on its outer side.
- Absorption sound-damping structure according to claim 1, the supporting structure (2) of which comprises a plate provided with openings.
- Absorption sound-damping structure according to claim 1 or 2, where the supporting structure (2) is shaped in the form of an aperture plate or a grid or has the form of strips or ribs.
- Absorption sound-damping structure according to one of claims 1 to 3, where the film (1) and the supporting structure (2) are manufactured from one piece.
- Absorption sound-damping structure according to one of claims 1 to 4, where the structure frame (3) consists of steel, aluminium or plastics.
- Absorption sound-damping structure according to one of claims 1 to 5, where the film (1) is glued or welded on to the supporting structure (2).
- Absorption sound-damping structure according to one of claims 1 to 6, where the film (1) is a thin metal film or a plastics film.
- Absorption sound-damping structure according to one of claims 1 to 7, where the film (1) is coated at the gas side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT87102341T ATE95935T1 (en) | 1986-02-21 | 1987-02-19 | ABSORPTION SILENCER. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3605684A DE3605684C2 (en) | 1986-02-21 | 1986-02-21 | Absorption silencer backdrop |
| DE3605684 | 1986-02-21 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0236810A2 EP0236810A2 (en) | 1987-09-16 |
| EP0236810A3 EP0236810A3 (en) | 1988-01-27 |
| EP0236810B1 true EP0236810B1 (en) | 1993-10-13 |
Family
ID=6294675
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP87102341A Expired - Lifetime EP0236810B1 (en) | 1986-02-21 | 1987-02-19 | Absorbing sound-damping structure |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0236810B1 (en) |
| AT (1) | ATE95935T1 (en) |
| DE (2) | DE3605684C2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10122617C1 (en) * | 2001-05-10 | 2002-06-20 | Lta Lufttechnische Komponenten | Sound-damping panel for ventilation plant has stabilized metal foil or plate spaced out on gas side of absorption material |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0531698B1 (en) * | 1991-09-12 | 1998-09-02 | Luwa Aktiengesellschaft | Sound-damping screen |
| AUPO910697A0 (en) * | 1997-09-11 | 1997-10-02 | Hrl Technology Pty Ltd | Improved sound attenuating device |
| DE102009034463A1 (en) | 2009-07-22 | 2011-02-03 | Filtro Klimatechnik Gmbh | Airborne sound absorbing device, particularly for use in air conditioning units, comprises sound absorbing bodies arranged in air flow channel or housing, where cover is designed at end of front side of sound absorbing body |
| GB2621015A (en) * | 2023-06-06 | 2024-01-31 | Pineapple Contracts Unlimited | Wall panel |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2630056A1 (en) * | 1975-07-30 | 1977-02-17 | Industrial Acoustics Co | SILENCER |
| FR2420080A1 (en) * | 1978-03-14 | 1979-10-12 | Ciat Sa | Fibrous sound absorbent screen for ventilation duct - is impregnated with binder to prevent fibrous contamination of air flow |
| CH640074A5 (en) * | 1978-11-09 | 1983-12-15 | Keller Alfred | Sound-absorbing body and method for the manufacture thereof |
| DE8303575U1 (en) * | 1983-02-09 | 1983-06-09 | Gerb-Akustik Consult GmbH, 4300 Essen | DEVICE FOR DAMPING NOISE IN COOLING DOORS AND LARGE BLOWED. |
| US4553631A (en) * | 1983-05-19 | 1985-11-19 | United Mcgill Corporation | Sound absorption method and apparatus |
-
1986
- 1986-02-21 DE DE3605684A patent/DE3605684C2/en not_active Expired - Fee Related
-
1987
- 1987-02-19 DE DE87102341T patent/DE3787742D1/en not_active Expired - Fee Related
- 1987-02-19 EP EP87102341A patent/EP0236810B1/en not_active Expired - Lifetime
- 1987-02-19 AT AT87102341T patent/ATE95935T1/en not_active IP Right Cessation
Non-Patent Citations (2)
| Title |
|---|
| Merkblatt "Relaxationsschalldämpfer-Elemente Typ F" vom 05.04.1980, Firma G+H Montage, D-6700 Ludwigshafen * |
| Merkblatt "Relaxationsschalldämpfer-Elemente Typ R" vom 06.11.1980, Firma G+H Montage, D-6700 Ludwigshafen * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10122617C1 (en) * | 2001-05-10 | 2002-06-20 | Lta Lufttechnische Komponenten | Sound-damping panel for ventilation plant has stabilized metal foil or plate spaced out on gas side of absorption material |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0236810A2 (en) | 1987-09-16 |
| DE3787742D1 (en) | 1993-11-18 |
| EP0236810A3 (en) | 1988-01-27 |
| DE3605684A1 (en) | 1987-08-27 |
| DE3605684C2 (en) | 1996-11-21 |
| ATE95935T1 (en) | 1993-10-15 |
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