DE202009006676U1 - Silencer, especially for compressed air surges - Google Patents

Abstract

An acoustically damping foam element (2; 22) consisting of a porous-body foam cushion body (4; 24) provided with a skin on the outside, characterized in that the cushion body (4; 24) is elastically yielding and the skin in the area of the sound inlet is open.

Description

The The invention relates to a silencing means, in particular for compressed air surges.

bleeding operations of pneumatic cylinders bring with blown noise themselves, which are often perceived as unpleasant. Therefore One is particularly in the use of frequently reversed and vented pneumatic cylinders endeavored to make these noises to dampen.

For example in emergency valves for pneumatically operated Door locks in public transport arise such disturbing blow-off noise. Out For safety reasons, the emergency valves from 3 km / h blocked by an actuating cylinder and falls below the Speed threshold released again. Due to the frequent Switching operations, z. B. in stop and go traffic, that is Valve on the actuator permanently switched, so it keeps coming back to ventilation processes with as disturbing sensed blow-off noise comes. The assemblies in the range However, the emergency valves do not usually allow any Cost-effective retrofitting or installation of insulating parts.

An Indian DE 10 2007 044 543 A1 described muffler comprises a disc-shaped body of porous foam, which is held fixed at the outlet and flows through the blown air flow.

In the DE 80 19 642 U1 a muffler is proposed, which consists of two successively arranged cap-shaped dampers made of foam, through which flows the exiting compressed air.

The use of sound-absorbing office machines, in particular typewriter documents, is known. One in the DE 32 08 017 A1 described foam mat is provided with a greased surface. This is facing the underside of the device to achieve improved sound absorption, especially in the area of the air inlet and outlet openings.

Of the Invention is based on the object, a soundproofing means to create its use even in complicated geometries without high additional costs is possible.

These Task is by the invention in a sound-absorbing Foam element solved with the features of claim 1. Advantageous developments sound-absorbing foam element are the subject of the dependent claims.

One Sound-damping foam element according to the Invention thus consists of a pillow body of porous Foam on the outside with a skin formation is provided. The cushion body is resilient and the skin is open in the area of the sound inlet.

The Foam element is placed on the sound source in use, covers these and fixed in this position. The exhaust air passes then over the opening of the skin, d. H. the released area, in the pillow body they no longer leaves and where it is steamed. she will Reflected on the skin and can multiply the pillow body run through. In this way, the compressed air in the foam element evaporates. Residual noise, which then still from the foam element penetrate, are apart from the reduced volume through felt the filtering of the high frequencies more pleasant.

The Inventive foam element is inexpensive. In addition, its installation is also unfavorable Easy to install. As the cushion body of the foam element is compliant, he only needs to open the exhaust port and Sound source are set, with the cavity opening this is facing, and adapts to the different installation conditions at. If the cushion body is pressed in for mounting, results automatically from the high neighboring areas a self-locking of the foam element.

By the outer skin of the foam element is this and also surrounded by it's component against moisture absorption protected.

at an advantageous embodiment of the invention sound-absorbing foam element comprises the cushion body a mounting cavity or mounting hole with open (ie without) skin formation. The pillow body is on a corresponding Projection or a protruding component mounted or to the projection or the component with opening facing toward this or this surrounding cavity pressed. The cavity then settles around the protruding part and the exhaust opening and adapts due to the elasticity of these.

expedient are the size and / or thickness of the pillow accordingly the required damping and also the injected Measure the amount of air, d. H. if this is big, so will the Cushion body chosen larger.

The invention will be further described below with reference to embodiments and the drawings. This illustration is for illustrative purposes only and is intended to illustrate the invention do not restrict to the specific combinations of features specified. Show it

1 a perspective view of a first embodiment of a sound-damping foam element according to the invention,

2 a perspective view of a second embodiment of a sound-damping foam member according to the invention,

3 a side view of a component group with pneumatic cylinder and exhaust opening and mounted sound-absorbing foam element according to 2 .

4 a sectional view of the component group of 3 along line IV-IV and

5 a view of the component group of 3 from below, which illustrates the function of the foam element.

In the following, a first embodiment of a damping foam element 2 according to the invention with reference to 1 described. The foam element consists of a cuboid cushion body 4 made of open-cell foam, z. As polyurethane, which is very flexible. The pillow body is spotted on the outside. On the in 1 shown side is in the Verhautung of the cushion body a circular surface 6 cut out, cut out or not covered. Here the foam is exposed to the outside.

The area 6 is intended for installation on a blow-out opening of a pneumatic assembly or the like. In this position, the cushion body is then placed on the relevant components in practical use or pressed and held on this. If necessary, it can simply be clamped by other components during assembly or by straps etc. The through the area 6 in the pillow body 4 injected compressed air spreads in this until it is reflected on the skin and is reflected again if necessary again. In this way, the Ausblasgeräusch is attenuated more and more, until it is perceived only weakly. The degree of damping is determined by the dimensions of the discharge opening and the amount of air that escapes, and also by the dimensions of the cushion body 4 certainly.

This in 2 shown second embodiment of a damping foam element 22 According to the invention in turn comprises a cuboid cushion body 24 made of open-cell foam, z. As polyurethane, which is highly flexible. The pillow body 24 has a skin on the outside. Furthermore, it is with a through opening 26 Mistake. In the area of the opening 26 , ie towards this, is the pillow body 24 free, so without skinning.

The opening 26 is intended that in their area compressed air from a blow-out opening of a mostly protruding component in the cushion body 24 blown. The pillow body 24 will then be in the assembly with the opening 26 placed on this device. By squeezing the pillow body 24 by other components then the component to be sealed or the exhaust opening is completely out of the otherwise supernatural pillow body 24 covered and sinked practically in this. The blown compressed air passes through the opening 26 in the pillow body 24 one and the Ausblasgeräusche are attenuated more and more, so that they are no longer perceived as disturbing.

The installation situation of the foam element 22 is exemplary based on 3 and 4 illustrating a pneumatic cylinder 60 , a pedestal mounted on it 62 with approximately square cross-section and exhaust opening 64 and components arranged above it 66 a pneumatic emergency valve control for a bus door locking system shows. In 5 is that with the opening 26 on the pedestal 62 attached cushion element 24 or the assembled foam element 22 shown. Through the components 66 is the cushion element 24 in the vicinity of the opening 26 completely compressed (see reference numeral 30 in 3 and 4 ), leaving the opening 26 completely closed. The compressed air can thus only in the cushion element 24 escape into it (see arrows 80 ) and no noise can go directly to the outside. The reflections of the compressed air on the skin are indicated by arrows 82 illustrated.

In 2 is the opening 26 shown in a circle. On the one hand, it can also extend around bodies with a square or rectangular cross-section, as with the base 62 the case is. On the other hand, it could also be designed, for example, with a square cross-section and then in turn comprise cylindrical bodies due to the material elasticity.

Depending on the intended installation location, the opening 26 also not be continuous, ie form a kind of blind hole. Whose walls are then without skin formation, so that over the opening of the sound in the cushion element 24 can penetrate. On the bottom of the opening 26 opposite skin is then a Verhautung available.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 102007044543 A1 [0004]
• - DE 8019642 U1 [0005]
• - DE 3208017 A1 [0006]

Claims (3)

Sound-absorbing foam element ( 2 ; 22 ), consisting of a cushion body ( 4 ; 24 ) made of open-pore foam, which is provided on the outside with a skin formation, characterized in that the cushion body ( 4 ; 24 ) is elastically yielding and the skin in the region of the sound inlet is open. Sound-absorbing foam element ( 22 ), characterized in that the cushion body ( 22 ) a mounting cavity or a mounting opening ( 26 ). Sound absorbing foam element, by characterized in that the size and / or thickness the cushion body according to the intended degree of damping are measured.