SE8505350A0

SE8505350A0 - Device for tubular silencer

Info

Publication number: SE8505350A0
Application number: SE8505350A
Authority: SE
Inventors: L F Hansen
Original assignee: Glava As
Priority date: 1984-11-14
Filing date: 1985-11-13
Publication date: 1986-05-15
Also published as: NO160027B; DK161783C; DK522585A; SE8505350D0; FI854448A0; NO160027C; DK161783B; DK522585D0; FI854448A; SE8505350L; NO844538L

Abstract

Rorformad ljuddampare, speciellt avsedd for anvandning i ventilationskanaler, bestaende av en utvandig rorformad beballare eller kammare (1) med centralt inlopp (7) och utlopp (8), i vilken behallaren invandigt vid sin mantelyta (2) har ett ljuddampande mineralfibermaterial (11) anordnat pa ett sadant satt att det skapas en central kanal mellan inlopp och utlopp och dar mineralullsmaterialet in mot kanalen (9) ar forsett med ett av hl perforerat material (10). Ljuddampnings- materialet bestar av mineralfibrer som är anordnade radiellt i ljuddamparen och materialet har paforts en duk (13) med oppen struktur in mot kanalen (9). Duken (13) bestar foretradesvis.av icke flamspridande textilmaterial, och har Worts genom limning. Mineralfibermaterialet bestar i utgangslaget av en matta av mineralullfibrer dar fibrerna ar orienterade i en riktning tvars sidoytorna, vilken matta inlagts i kammaren pa ett sadant satt att de sammanfallande kanterna pressas mot varandra. Tubular muffler, specially designed for use in ventilation ducts, consisting of an external rudder-shaped baler or chamber (1) with a central inlet (7) and outlet (8), in which the container has a sound-absorbing mineral fiber material (11) inside its casing surface (2) arranged in such a way that a central channel is created between inlet and outlet and where the mineral wool material towards the channel (9) is provided with a material perforated by hl (10). The sound evaporation material consists of mineral fibers which are arranged radially in the sound evaporator and the material has a cloth (13) with an open structure towards the channel (9). The fabric (13) preferably consists of non-flame-spreading textile material, and has Worts by gluing. The mineral fiber material consists in the starting layer of a mat of mineral wool fibers where the fibers are oriented in a direction transverse to the side surfaces, which mat is inserted in the chamber in such a way that the coincident edges are pressed against each other.

Description

GLAVA A/S (A■/ AMAPn,.7-7gHU PansRef 8505350-22851503/UH 1 ANORDNING VID RbRFORMIG LJUDDXMPARE FOreliggande uppf inning avser en rOrformad ljuddampare, speciellt for ventilationskanaler och -ror, bestdende av en behAllare med centralt inlopp och utlopp, vilken behallare vid sin inre periferi har ett ljuddampande mineralfibermaterial, som dr anordnat pa ett sadant satt att det bildas en central forbindelse mellan behAllarens in- och utlopp, och dar mineralullsmaterialet in emot den genomgdende kanalen fasthalles med hjalp av ett av hAl perforerat material. GLAVA A / S (A ■ / AMAPn, .7-7gHU PansRef 8505350-22851503 / UH 1 DEVICE FOR RBRFORMIC SOUND CARRIER The present invention relates to a tubular muffler, in particular for ventilation ducts and pipes, consisting of a container with a central inlet and outlet, which container has at its inner periphery a sound-vaporizing mineral fiber material, which is arranged in such a way that a central connection is formed between the inlet and outlet of the container, and where the mineral wool material is held against the through-going channel by means of a material perforated by hAl.

Forcerad ventilation anvands mer och mar, ocksh i vanliga bostadshus. Detta beror delvis pd att man numera har storre mojlighet for varmeAtervinning. Det dr emellertid allmant }cant att forcerad ventilation i rOr eller kanaler kan fororsaka buller. Buller i det hogre frekvensomradet ar relativt enkelt att dampa. Det ar emellertid desto svarare att dampa buller i lAgfrekvensomrddet. Forced ventilation is used more and mar, ocksh in ordinary residential buildings. This is partly due to the fact that you now have a greater opportunity for heat recovery. However, it is common knowledge that forced ventilation in pipes or ducts can cause noise. Noise in the higher frequency range is relatively easy to vaporize. However, it is all the more appropriate to vaporize noise in the low frequency range.

Enligt GB PS 1 442 190 framgAr en rorformad ljuddampare. Ljuddamparen bestAr av en rorformad mineral- ullsmatta van i fibrerna har slumpmassig orientering vilket ger en fOrhallandevis formfast inre yta. For att uppna en tillracklig uppstyvning an denna ljuddampare forsedd med en stodcylinder bestdende av ett oppet stalnat anbringat mot den inre ytan av den nor- formiga mineralullsmattan. Denna ljuddampare har inte tillfredsstallande effektivitet i lagfrekvensomradet. According to GB PS 1 442 190, a rudder-shaped silencer appears. The silencer consists of a rudder-shaped mineral The wool mat used in the fibers has a random orientation, which gives a relatively dimensionally stable inner surface. In order to obtain a sufficient stiffening of this muffler provided with a support cylinder consisting of an openly mounted mounted against the inner surface of the north shaped mineral wool rug. This muffler does not have satisfactory efficiency in the low frequency range.

Yindamalet med foreliggande uppfinning an att anvisa en rorformad ljuddampare av detta slag, som an enkel och billig att framstalla, lattare i vikt an tidigare ljuddampare, och som ger god effekt. The object of the present invention is that designate a rudder-shaped steamer of this kind, which is simple and cheap to produce, lighter in weight an earlier muffler, and which gives a good effect.

Detta andamal uppnas enligt uppfinningen med en rarformad ljuddampare av den inledningsvis namnda typen som kannetecknas av att ljuddampningsmaterialet BI 203 2 bestar av mineralullfibrer som ar radiellt orienterade. This object is achieved according to the invention with a rim-shaped silencer of the type mentioned in the introduction which can be characterized by the sound vaporization material BI 203 2 consists of mineral wool fibers that are radially oriented.

I en vidare utveckling av uppfinningen utgors en i ljuddamparen ingAende av ett icke flamsPridande textilmaterial. Ett ytterligare sardrag med uppfinningen är att duken pAfOrs mineralfibermaterialet genom limning. In a further development of the invention is provided a non-flame spread in the muffler textile material. A further feature of the invention is that the fabric pAfOrs the mineral fiber material by gluing.

I en fOredragen utforingsform av uppfinningen, som innebgr enkel tillverkning, utg8rs det ljuddampande materialet i utgAngslgget av en plan platta, en sá kallad lamellmatta av mineralull med fiberriktningen anordnad tvars mattans utstrackning, inlagd i behAllar- utrymmet med tatt sammanpressade, anliggande kanter. In a preferred embodiment of the invention, which involves simple manufacture, it is sound-absorbing the material in the starting point of a flat plate, a saw called lamellar mat of mineral wool with the fiber direction arranged the extent of the transverse mat, inserted in the container the space with compressed, abutting edges.

En speciell utf8ringsform av uppfinningen, avsedd for anvandning vid st8rre kanaltvarsnitt, dar det centralt i kanalen finns en av hAl perforerad cylindrisk kropp av mineralfibrer, kannetecknas av att den av hal perforerade cylindriska kroppen utvandigt belagts med en duk med oppen struktur av f8retrgdesvis icke flamspridande material. A special embodiment of the invention, intended for use with larger channel cross-sections, where applicable centrally in the channel is a cylindrical perforated by hAl body of mineral fibers, may be characterized by that of slippery perforated cylindrical body externally coated with a cloth with an open structure of preferably not flame retardant material.

For att erhAlla en mekaniskt stark mineralullsmatta som är lampad f8r inlaggning i ljuddamparen, kanne- tecknas uppfinningen av att mattan pA den sida som ej gr belagd med duken med oppen struktur har en mekaniskt stark belaggning, av t ex ett trAdforstarkt laminat. To obtain a mechanically strong mineral wool mat which is lit for loading into the muffler, can The invention is illustrated by the carpet on the side which not gr coated with the cloth with open structure has a mechanical strong coating, for example of a wood-reinforced laminate.

Ljuddgmparen enligt uppfinningen bar lggre vikt gn tidigare ljuddgmpare av samma slag, varvid sAdana ljuddampare som tidigare anvands haft en perforerad metallplatta som tackt fibermaterialet in mot kanalen. The sound absorber according to the invention carried less weight gn previous sound absorbers of the same kind, whereby sAdana steamer previously used had a perforated metal plate that tacked the fibrous material towards the channel.

Ljuddamparen enligt uppfinningen kommer sAledes dessutom att bli billigare att,tillverka eftersom man slipper att montera en sAdan perforerad platta. The muffler according to the invention thus also comes to become cheaper to, manufacture because you avoid to mount a perforated plate.

Ljuddamparen enligt uppfinningen ger bgttre effekt, genom att mineralullsmaterialet bestAr av en matta med fibrerna i tvarriktningen som bojs mat den rorformade behAllaren, s& att materialet komprimeras och sAledes erhAller en st8rre tgthet i den del av materialet som är vant mat kanalen. Detta ger en battre ljud- 3 dampningsverkan. Den tvart staende fiberformen sakerstaller en relativt styv, formfast inre yta som inte erfordrar ytterligare uppstyvning. Ytan kommer inte att deformeras ens vid relativt stora lufthastigheter. Med tidigare ljuddampare fanns ut mot kanalen partier med fast plattmaterial mellan perforeringarna som av naturliga skal ger ljudreflektioner, ants& icke absorberande partier. Genom att fibrerna är orienterade i tvarriktningen, dvs radiellt i ljuddamparen, kommer de att vara avsevart battre sakrade mot lossrivning an fibrerna i tidigare ljuddampare av samma slag, dar fibrerna ligger parallellt med ytorna i kanalen. Den palagda duken med oppen struktur ger dessutom battre sakring mot fibermedrivning an den tidigare utnyttjade perforerade plattan. The muffler according to the invention gives a better effect, in that the mineral wool material consists of a mat with the fibers in the transverse direction being bent food the tubular the container, so that the material is compressed and thus obtains a greater density in that part of the material who is used to the food channel. This gives a better sound- 3 steaming effect. The transverse fiber shape provides a relatively rigid, dimensionally stable inner surface which does not require further stiffening. The surface will not deform even at relatively high air velocities. With earlier sound vaporizers were found towards the duct portions with solid plate material between the perforations which of natural shells give sound reflections, ants & non-absorbent portions. Because the fibers are oriented in the transverse direction, ie radially in the muffler, they come to be considerably better secured against tearing of the fibers in previous mufflers of the same type, where the fibers lie parallel to the surfaces in the duct. The paved fabric with open structure also provides better protection against fiber entrainment than the previously used one perforated plate.

Det skall narvid papekas att den senare tidens forskning bar fastlagit att fibermedrivning i ventilationsanlaggningar kan utgara en halsofara, varfor det är ett viktigt sardrag hos uppfinningen att den pa ett battre satt an tidigare sakras mot fibermedrivning. It should be pointed out that recent research has established that fiber entrainment in ventilation systems can constitute a throat hazard, which is why it is an important feature of the invention that the in a better way than previously secured against fiber entrainment.

Uppfinningen skall i det foljande narmare beskrivas med hanvisning till ritningarna, som visar tvd utforingsexempel av uppfinningen saint tva konventionella 25 ljuddampare av samma slag. The invention will be described in more detail below with reference to the drawings, which show two embodiments of the invention as two conventional silencers of the same kind.

Fig 1 visar en ljuddampare av }cant slag, Fig lA visar en ljuddampare av samma slag, men enligt uppfinningen, Fig 2 visar en annan kand ljuddampare, Fig 2A visar en ljuddampare enligt fig 2, meh enligt uppfinningen, och Fig 3 visar ett partiellt snitt utmed linjen III-III i fig 1A. fig 1 visas en forsta utforingsform av en kand 35 ljuddampare som bestar av en kammare eller en behallare 1, innefattande en plattmantel 2 med gavelvaggar 3 och 4 i vilka urtagits centrala oppningar 5 och 6. 4 Vid dessa oppningar har fasts en inloppsstos 7 resp en utloppsstos 8. For att skapa en kanal 9 finns invAndigt i kammaren 1 mellan inloppsstosen 7 och utloppsstosen 8 insvetsat ett ror av perforerat plattmaterial 10. Fig. 1 shows a muffler of this kind, Fig. 1A shows a muffler of the same kind, but according to the invention, Fig. 2 shows another known muffler, Fig. 2A shows a muffler according to Fig. 2, meh according to the invention, and Fig. 3 shows a partial section along the line III-III in Fig. 1A. Fig. 1 shows a first embodiment of a jug of steamer consisting of a chamber or a container 1, comprising a plate jacket 2 with end walls 3 and 4 in which central openings 5 and 6 have been recessed. 4 At these openings an inlet nozzle 7 or one has been fixed outlet socket 8. To create a channel 9 is inside in the chamber 1 between the inlet nozzle 7 and the outlet nozzle 8 welded in a tube of perforated plate material 10.

I mellanrummet mellan manteln 2 och den perforerade plattan 10 har anbringats mineralullmaterial 11. In the space between the jacket 2 and the perforated one the plate 10 has been applied mineral wool material 11.

Vid den uppfinningsenliga utforingsformen i fig lA ar ljuddSmparen uppbyggd pa samma sRtt med en kammare 1 som bestar av en mantel 2, gavelv&ggar 3 och 4, inloppsstos 7 och utloppsstos 8 med en kanal 9 mellan stosarna 7 och 8. Det absorberande materialet bestar av en mineralullsmatta 12 som är inlagd i kammaren 1 ut mot mantelplattan 2, sac:Ian att de sammanfallande kanterna pressas hart mot varandra. PA den sida av mattan som ar vRnd in mot kanalen 9 har, exempelvis genom limning, pA mattan anbringats en duk 13 med oppen struktur. For att enklare kunna hantera mattan Nr den pa den sida som vetter ut mot manteln 2 fOrsedd med en fOrstRrkningsfolie, exempelvis ett trAdarmerat laminat 14. I mineralullplattan loper fibrerna pA tvEren mellan duken 13 och duken 14. Av fig 3 framgar tydligt att fibermaterialet Er komprimerat in mot Oppningen 9. In the embodiment according to the invention in fig The muffler is built in the same way as a chamber 1 consisting of a mantle 2, end walls & walls 3 and 4, inlet socket 7 and outlet socket 8 with a channel 9 between sockets 7 and 8. The absorbent material consists of a mineral wool mat 12 which is inserted into the chamber 1 out towards the mantle plate 2, sac: Ian that the coincident the edges are pressed hard against each other. ON the side of the carpet facing the channel 9 has, for example by gluing, a cloth 13 was applied to the carpet open structure. To make it easier to handle the carpet When it is on the side facing the jacket 2 provided with a reinforcing foil, for example a wood reinforced laminate 14. In the mineral wool plate the fibers run pA the cross between the cloth 13 and the cloth 14. Fig. 3 shows clear that the fibrous material is compressed towards The opening 9.

Fig 2 visar en kand utforingsform av en ljuddampare for ventilationskanaler med storre tvHrsnitt, vid vilka det 5r nodvandigt att absorbera mycket lAgfrekvens- buller, vilken ljuddampare Er uppbyggd pa samma satt som ljuddamparen i fig 1, med en kammare 1 som bestAr av en yttre,mantel 2, gavelv5ggar 3, 4 och inloppsstos 7 och en utloppsstos 8. I kanalen mellan stosarna 7 och 8 finns centralt anordnat ytterligare en absorbtions- kropp 15, en sA kallad "torpedo" som bestAr av mineral- ullfibrer. fiRrigenom skapas en ringformig kanal 9'. Fig. 2 shows a known embodiment of a muffler for ventilation ducts with larger cross-sections, wide which it is necessary to absorb a lot of low frequency noise, which muffler is built in the same way as the muffler in Fig. 1, with a chamber 1 consisting of of an exterior, jacket 2, end walls 3, 4 and inlet socket 7 and an outlet socket 8. In the channel between the sockets 7 and 8, a further absorbent arrangement is arranged centrally. body 15, a so-called "torpedo" which consists of mineral wool fibers. This creates an annular channel 9 '.

Den centralt anordnade kroppen 15 5r omgiven av ett perforerat plattror 16. . The centrally arranged body 15 5r surrounded by one perforated plates 16..

I fig 2A som visar en annan utforingsform av en ljuddEmpare enligt uppfinningen, vilken paminnerom ljuddamparen i fig 2, ar den langstrackta kroppen 15 i fig 2 ersatt med ett mineralullsfiberrOr 17 som är inneslutet i en duk 18 med oppen struktur, och som ar s& bra fast vid den Ovre ytan att mineralulls- fibrer i kroppen 17 sakras mot medrivning av den forbistrOmmande luf ten. Fig. 2A showing another embodiment of a sound emper according to the invention, which is a memory room the evaporator in Fig. 2, the elongate body 15 in Fig. 2 is replaced by a mineral wool fiber tube 17 which is enclosed in a cloth 18 with an open structure, and which is so firmly attached to the upper surface that the mineral wool fibers in the body 17 are sacrificed against entrainment of the bypassing air.

Genom att man utnyttjar fibermattor kan man utnyttja material i metervara. Dessa kan formas till rullar och vid produktionen av ljuddampare enligt 10 uppfinningen kapas de erforderliga mattstyckena. By using fiber mats, you can use materials by the meter. These can be formed into rolls and in the production of steamers according to the invention the required mat pieces are cut.

Claims

PATENT REQUIREMENTS

Tubular muffler, in particular for ventilation ducts and pipes, consisting of an external, tubular container (1), with a central inlet (7) and outlet (8), in which the container is provided internally at its outer surface (2) with a sound-absorbing mineral fiber material (11) in such a way that a central channel (9) is created between the inlet and the outlet, and where the wool material towards the channel (9) is held in place by means of a material perforated of halo, preferably a cloth (13) with open structure, characterized in that the sound damping material consists of mineral fibers which are oriented with the fibers radially in the sound evaporator.

Tubular muffler according to claim 1, characterized in that the cloth consists of a non-flame spreading textile material.

Tubular sound evaporator according to Claims 1 and 2, characterized in that the fabric is removed by gluing.

Tubular muffler according to claim 1, characterized in that the mineral wool material is a carpet of mineral wool with the fiber direction across the side surfaces of the plate, which mat is inserted in the chamber 1 with slightly compressed abutting edges.

Tubular muffler according to claims 1 and 4, characterized in that the mat on the opposite side of the open structure fabric (13) has a mechanically strong coating (14) of, for example, a wood-reinforced laminate, paper or the like.

Tubular muffler according to claim 1, wherein in the center of the channel (9) there is a perforated cylindrical body (17) of mineral fibers, characterized in that the perforated cylindrical body is externally supported by a cloth (18) with an open structure, preferably of a non-flame-spreading textile material. Pans 8505350-2