HU205183B - Sound-absorbing coating member - Google Patents

Abstract

SUMMARY OF THE INVENTION The present invention relates to a sound absorbing layer having a sound absorbing layer placed on a perforated plate, which is shaped as a saw tooth. The essence of this is that the wrapping element is provided at its edges, preferably with U-shaped fixing flanges (7) and at the side of the sound absorbing layer (2), with a flat, sound-transmitting end plate connected to each other by means of fixing elements (6) (Fig. 1). Fig. 1 EN 205 183 B Scope of the description: 4 pages (including 1 sheet)

Description

SUMMARY OF THE INVENTION The present invention relates to an acoustic absorber casing which is preferably used for noise reduction or noise reduction in industrial plants and other noisy spaces. For acoustic cladding of studios, boardrooms, lecture halls and other office spaces, a cladding element made of perforated or solid fibreboard and optionally covered with a separate sound-absorbing layer such as a sponge is known. This sound-absorbing layer and fibreboard are placed together on the surface to be covered. The coverings created in this way are either formed with their entire surface in a single plane or with the cover elements spaced apart from one another at a different distance from the surface to be covered. In these cases, the casings are generally rectangular or square.

Because noises are usually broadband, you must use elements that have the necessary sound absorption over a wide frequency band to reduce noise. For large spaces, it is usually not possible to completely cover the surface, such as the ceiling and / or side walls. There are technological reasons, on the one hand, and economic reasons, on the other hand, for the whole covering to be extremely expensive.

There are so-called functional (suspended) sound absorbers or local sound absorbers, which are then placed in the room under the guidance of an acoustical specialist. What the sound absorption should be is characterized by a so-called absorption number. The Ahang absorbance number is a function known per se, according to the degree of sound absorption.

U.S. Patent No. 4,605,093 discloses a high-sound-absorbing casing which is shaped like a sawtooth and consists of individual elements, i.e., the angle enclosed by the sawtooth stems is adjustable by the individual and variable positions.

U.S. Patent 4,531,609 also discloses a sawtooth-shaped sound-absorbing wrapper which is pressed into glass wool placed on the surface to be wrapped, thus forming a sponge-like shape.

A disadvantage of the above and other known covers is that it is quite difficult to determine exactly what sound absorption they will accomplish in the first place, they are generally cumbersome to install and may not be assembled.

It is an object of the present invention to provide an acoustic absorber casing which may optionally be pre-assembled for the entire casing and which can substantially increase the acoustic absorber surface while providing effective acoustic absorption at predetermined frequencies.

It has been recognized on the one hand that if the sound-absorbing wrapper is shaped like a sawtooth and not directly placed on the surface to be covered, it is possible to absorb not only the front but also the reflected sound from the covered surface, particularly side with a sound-permeable layer.

Accordingly, the present invention provides a sound-absorbing wrapper with a sound-absorbing layer placed on a perforated plate which is shaped like a sawtooth.

The acoustic absorber casing according to the invention is characterized in that the casing member is provided at its edges, preferably with U-shaped fastening flanges, and on its side towards the sound absorber layer, with a flat, sound-transmitting sealing plate which is interconnected with each other.

Preferably, there is an air gap between the perforated plate and the sound absorbing layer.

Preferably, the saw-tooth-shaped portion consists of equilateral triangles.

In a further preferred embodiment, the sawtooth-shaped portion is formed of equilateral triangles.

Preferably, the perforated sheet is made of aluminum.

Preferably the sealing sheet is a textile, preferably a cloth soaked in plastic.

Preferably, the sealing sheet is solid fibreboard.

The sound absorption cover of the present invention will now be exemplified below. with the aid of an embodiment of the invention is illustrated in more detail in the accompanying drawings, in which:

Figure 1 is a cross-sectional view of an embodiment of the invention, a

2 shows an example of the arrangement of the casing elements according to the invention next to one another. is shown.

1 is a sectional view of an exemplary embodiment of the sound-absorbing wrapper according to the invention. Fig. 1 shows the sealing plate (1), which is at all times parallel to the surface to be covered, said sealing plate (1) having a sawtooth-shaped sound-absorbing layer (2) arranged by means of a frame structure (2). ) sound-absorbing layer (4) with spacers (3) connected by a perforated plate and formed on the side facing the closing plate (1) with a U-shaped fixing flange (7) through which fastening elements (6) are guided and with the help of the frame structure (8), the sound-absorbing layer (2), the perforated plate (3) and the sealing plate (1) are interconnected and thus form one unit. In the exemplary embodiment, the perforated sheet (3) is made of aluminum, but may also be formed of other material and may be secured to the frame structure by any means, such as being glued. Optionally, the frame structure (8) may be omitted. The fasteners 6 at the fastening flanges 7 may also be used to fasten the sound-absorbing cover to the surface to be covered. These fasteners (6) may be, for example, pop rivets

HU 205 183 Β

Figure 2 shows a possible arrangement of the sound-absorbing wrapper according to the invention along the surface to be covered. This embodiment can be used as a corner arrangement and can be mounted on the ceiling or sidewall. Optionally, the panel itself may be suspended from the ceiling. The casing can also be formed with an additional air gap between the sealing plate (1) and the securing flanges (7). The sound-absorbing casing formed by the casing member can be implemented in a number of embodiments, as the casing member itself can be implemented in many different ways; . The sealing sheet (1), which is made of sound-permeable material, can be made of textile, imitation leather or solid fibreboard or can be formed of a cloth impregnated with plastic. The perforated sheet (3) is a metal sheet, preferably aluminum sheet, where the number of perforations is primarily determined by the degree of sound absorption desired in the room, a technique known per se to acoustics. The material of the sealing plate (1) can also be used to adjust the absorption frequency.

An advantage of the sound-absorbing casing according to the invention is that the sound-absorbing surface has a surface area of approx. It is 30% higher than known solutions and thus increases the absorption rate accordingly. Due to the design of the saw-tooth-shaped portions, it has a larger air space behind the surface than conventional sound-absorbing elements, and thus provides significant sound absorption at mid-frequency. By appropriately selecting the sound absorption layer (2), the center frequency absorption can be significantly expanded. The closing plate (1) itself functions essentially as a membrane for absorbing reflected sound, thereby further increasing the absorption rate of the entire sound-absorbing housing.

The sound-absorbing casing according to the invention has the advantage that it forms well-assembled units, is easy to transport and very efficient in operation.

Claims (7)

PATENT CLAIMS A sound-absorbing casing with a sound-absorbing layer on a perforated plate, which is shaped like a sawtooth, characterized in that the casing has a flat, sound-transmitting sealing sheet (1) at its edges, preferably U-shaped fastening flanges ), which are interconnected by means of fastening elements (6). Sound absorbent wrapper according to claim 1, characterized in that there is an air gap (5) between the perforated plate (3) and the sound absorbing layer (2). The sound-absorbing casing according to any one of claims 1 or 2, characterized in that the tooth-shaped part consists of equilateral triangles. Sound-absorbing casing according to one of claims 1 or 2, characterized in that the saw-tooth-shaped part is formed of equilateral triangles. 5. Sound absorbent cover according to any one of claims 1 to 3, characterized in that the perforated plate (3) is made of aluminum. 6. Sound absorbent wrapper according to any one of claims 1 to 3, characterized in that the sealing sheet (1) is a textile, preferably a cloth soaked in plastic. 7. Sound-absorbing casing according to any one of claims 1 to 3, characterized in that the sealing sheet (1) is a solid fibreboard.