DK177881B1

DK177881B1 - Muffler

Info

Publication number: DK177881B1
Application number: DK200500174A
Authority: DK
Inventors: Christer Grönlund
Original assignee: Sanhem Konsultit Oy
Priority date: 2004-02-05
Filing date: 2005-02-04
Publication date: 2014-11-03
Also published as: DK200500174A; FI121029B; SE0500254L; FI20040175A; FI20040175A0; SE531118C2

Abstract

Rørformet lyddæmper (1), hvor der inde i røret (2) findes en langsgående resonansplade {3), som er omsluttet af dæmpermateriale (4), idet resonanspladen (3) ikke er fastgjort til rørets (2) inderside.Tubular muffler (1), wherein inside the tube (2) is found a longitudinal resonant plate (3) enclosed by attenuator material (4), the resonant plate (3) not being attached to the inside of the tube (2).

Description

DK 177881 B1DK 177881 B1

LyddæmperMuffler

Opfindelsen angår en rørformet lyddæmper.The invention relates to a tubular silencer.

5 I publikationerne EP 0 754 901, JP 1 296 040, GB 2 250 356 og DE 19501981 beskrives sådanne lyddæmpere, hvilke repræsenterer teknikkens standpunkt.5 Publications EP 0 754 901, JP 1 296 040, GB 2 250 356 and DE 19501981 describe such silencers which represent the state of the art.

Kendte lyddæmpere består af en rørformet rund lyddæmper, i hvilken lydabsorberende materiale er anbragt langs den indre periferi. I midten af lyddæmpere af rørmodel kan der 10 desuden være en eller flere lydabsorberende mellemvægge eller en rund "patron".Known mufflers consist of a tubular round muffler in which sound absorbing material is disposed along the inner periphery. In addition, in the middle of pipe mufflers there may be one or more sound-absorbing partitions or a round "cartridge".

Samtlige mellemvægge har det fælles træk, at de er fastgjort til en ydre kappe. På markedet forekommer der også effektive lyddæmpere, i hvilke den indre dels tværsnitform ændres i strømningsretningen. I rektangulære lyddæmpere ifølge kendt teknik er der en eller flere mellemvægge ("bafler"), 15All the partitions have the common feature that they are attached to an outer sheath. In the market there are also effective silencers, in which the cross-sectional shape of the inner part changes in the direction of flow. In the prior art rectangular silencers there are one or more partitions ("baffles"), 15

Ovennævnte lyddæmpere ifølge kendt teknik har mangelfulde lydabsorberende egenskaber og/eller høje produktionsomkostninger.The above-mentioned silencers of the prior art have deficient sound absorbing properties and / or high production costs.

Formålet med foreliggende opfindelse er at tilvejebringe en lyddæmper, med hvilken man 20 undgår ovennævnte ulemper og muliggør en mere effektiv lydabsorbering.The object of the present invention is to provide a silencer which avoids the aforementioned disadvantages and enables a more efficient sound absorption.

En rund rørlignende lyddæmper ifølge opfindelsen er kendetegnet ved, at der ikke er lydabsorberende materiale på dens indre periferi, men en effektiv lydabsorbering opnås med en løs "mellemvæg", dvs. en resonansplade. Pladen er ikke fæstnet ved rørets indre 25 periferi, men den er omgivet af det lydabsorberende materiale, så at pladen kan skydes ind i rørkappen sammen med det lydabsorberende materiale.A round tube-like muffler according to the invention is characterized in that there is no sound-absorbing material on its inner periphery, but an effective sound-absorption is achieved with a loose "middle wall", ie. a resonant plate. The plate is not attached to the inner periphery of the tube, but it is surrounded by the sound-absorbing material so that the plate can be inserted into the tube sheath together with the sound-absorbing material.

Fordelen ved en lyddæmper ifølge opfindelsen er, at den effektivt formindsker luft- og resonanslyd ved frekvenser, der er forstyrrende for mennesker. Lange lydbølger trænger 30 ikke gennem lyddæmperen, men reflekteres indefter fra rørkappen, hvor de støder imod det lydabsorberende materiale og resonanspladen.The advantage of a silencer according to the invention is that it effectively reduces air and resonance sound at frequencies that are disturbing to humans. Long sound waves 30 do not penetrate the silencer, but are reflected inward from the casing where they abut the sound absorbing material and resonant plate.

En lyddæmper ifølge opfindelsen kan også let monteres i allerede eksisterende rør.A silencer according to the invention can also be easily mounted in preexisting pipes.

35 Nedenfor beskrives opfindelsen detaljeret med henvisning til de medfølgende tegninger, til hvilke opfindelsen ikke er tænkt begrænset.The invention is described in detail below with reference to the accompanying drawings, to which the invention is not intended to be limited.

Figur 1 viser en lyddæmper set fra siden.Figure 1 shows a silencer as seen from the side.

40 Figur 2 viser en lyddæmper i tværsnit.40 Figure 2 shows a silencer in cross section.

Opfindelsen angår en rørformet rund lyddæmper 1, som er kendetegnet ved, at der inde i røret 2 findes en resonansplade 3, som er omgivet af det lydabsorberende materiale 4, og at resonanspladen 3 ikke er fastgjort til røret 2‘s indvendige overflade.BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a tubular round muffler 1, characterized in that a resonant plate 3 is enclosed within the tube 2 surrounded by the sound-absorbing material 4 and that the resonant plate 3 is not attached to the inner surface of the tube 2.

DK 177881 B1 2DK 177881 B1 2

Resonanspladen 3, som er monteret inde i røret 2, har en tykkelse på 0,4 mm og en bredde, som udgør 2/3 af røret 2's udvendige diameter.The resonant plate 3 mounted inside the tube 2 has a thickness of 0.4 mm and a width which is 2/3 of the outside diameter of the tube 2.

S Resonanspladen 3 og det omgivende lydabsorberende materiale 4 kan skydes ind i røret 2, hvorved lange lydbølger ikke kan passere gennem røret 2.S The resonant plate 3 and the surrounding sound-absorbing material 4 can be pushed into the tube 2, whereby long sound waves cannot pass through the tube 2.

For at lette monteringen kan en hængeskinne 5 fastgøres parallelt med røret 2 ved den øvre del af røret 2, som omgiver lyddæmperen 1.To facilitate mounting, a hanging rail 5 can be fixed parallel to the pipe 2 at the upper part of the pipe 2 which surrounds the silencer 1.

1010

Det er indlysende for en fagmand, at opfindelsens udførselsformer ikke er begrænset til ovennævnte eksempel, men kan variere inden for rammerne af de vedhæftede krav.It will be obvious to one skilled in the art that the embodiments of the invention are not limited to the above example but may vary within the scope of the appended claims.

Således kan man inden for rammerne for opfindelsen efter behov fremstille lyddæmpere, der er mere komplicerede end dem, der er beskrevet i eksemplet.Thus, within the scope of the invention, silencers that are more complicated than those described in the example can be prepared as needed.

Claims

Tubular muffler (1), characterized in that a longitudinal resonant plate (3) is enclosed within the tube (2) which is surrounded by sound absorbing material (4) and in that the resonant plate (3) is not attached to the inner surface of the tube (2).

Silencer (1) according to claim 1, characterized in that the resonant plate (3) has a thickness of between 0.3 and 0.4 mm.

Silencer (1) according to claim 1, characterized in that the resonant plate (3) has a width which is at least 2/3 of the outer diameter of the pipe.

Silencer (1) according to claim 1, characterized in that the resonant plate (3) and the sound-absorbing material (4) surrounding it are inserted into the tube (2) by insertion.