IT202000017035A1 - FIREPROOF MULTILAYER SOUND INSULATION PANEL - Google Patents

Description

DESCRIPTION

Technical field

The present invention relates to a multilayer fireproof acoustic insulation panel, preferably for both high-frequency sound components and low-frequency sound components.

In general, the present invention finds wide application in technical applications in which it is required both to provide acoustic insulation between rooms and to ensure high fire resistance, therefore particularly but not limited to naval and aeronautical applications.

Known art

Within this technical field, do different needs merge? also very heterogeneous from each other, but all of which must necessarily be completed in order to fall within the specific operating requirements.

So, if on the one hand tools are being studied that can attenuate or inhibit the propagation of sound, on the other? it is often also necessary to find solutions that can combine different needs of different nature, such as structural strength or fire resistance in the presence of significant mechanical or thermal stresses.

At all? further needs of still different types can be added, such as the weight requirements, which are often well defined, for example, for internal and external components of aeronautical aircraft.

The components that are pi? affected by this type of common requirements are clearly those linked to the external and internal structure of aircraft and environments, these components being essential and therefore extensively adopted in all the embodiments within the aforementioned technical applications.

Were they therefore? developed various solutions and various devices to try to find a solution that is optimized for all the contemporary needs to be satisfied for the structural elements, solutions in particular relating to the structure of the walls adopted.

US patent application US 2005/194210 A1 describes for example an apparatus for reducing noise in an aircraft cabin comprising a portion of structure and honeycomb filling material.

The utility model? Chinese CN 203,714,147 U instead describes a fireproof and soundproofing sandwich structure made using flameproof material squeezed between two plates.

The utility model? Chinese CN 207,244,993 U alternatively discloses a sandwich structure with soundproofing material interposed between two plates.

The devices described in the known art still have some drawbacks, which can be represented by an imperfect acoustic insulation, by a more difficult applicability? for some specific applications, from excessive dimensions and excessive weights of the attenuating device cos? conceived, or by excessive complexity? constructive.

Summary of the invention

An object of the present invention ? that of obviating drawbacks of the prior art.

A particular purpose of the present invention ? that of realizing an acoustically insulating device suitable for applications in which weight and fire resistance requirements are also of primary importance.

A further particular object of the present invention ? that of obtaining an optimization of the characteristics of the attenuating device.

Other purpose? that of providing a device which has global characteristics superior to those of the sum of the individual components thanks to a synergistic effect between them.

These and other objects are achieved by means of a multilayer fireproof acoustic insulation panel according to the characteristics of the attached claims which form an integral part of the present description.

An idea at the basis of the present invention ? to provide a multilayer fireproof acoustic insulation panel comprising a first panel and a second panel facing each other, at least one of the first panel and the second panel being made of fireproof material, a cavity layer being interposed between the first panel and second panel. The first panel and the second panel are interconnected by a plurality of of elastic elements spaced apart, this plurality? of elastic elements each providing a first end? connected to an internal surface of the first panel and a second end? connected to an internal surface of the second panel. Generally, but not limited to, the? interspace ? an air gap. Nothing prevents you from adopting a different fluid, or inserting soundproofing and fireproof material to obtain a better soundproofing effect.

Advantageously, the present solution allows to obtain an acoustic insulation attributable to the functioning of an ideal mass-spring-mass system, in which the masses are constituted by the first and second panel and the spring ? made up of the combination of elastic elements and cavity. This mass-spring-mass mechanism exploits the dynamic characteristics of the stratigraphy to provide greater acoustic insulation compared to single-layer insulating elements, characterized by performance based solely on the mass of the component.

Advantageously, the combined use of the cavity with the elastic elements in combination, compared to the use of a single-layer panel, allows to obtain an effect on the entire spectrum of audible frequencies, without drawbacks due to resonance of the wall at low frequencies and the effect of coincidence between tangential components of the incident sound wave with the resonance frequency of the flexural waves of the wall at high frequencies.

To there? the flame-retardant feature conferred by at least one fireproof panel is combined, thus making the multilayer panel so structured, suitable for applications that require the simultaneous fulfillment of these requirements.

Further advantageously, the elastic elements lead to a multilayer panel with a flexural stiffness comparable to that of an equivalent single panel of the same thickness as the multilayer panel and of solid material, against a considerably lower weight. There? Obviously ? particularly preferred for applications that require light weight components as a specific requirement, such as aeronautical ones.

Preferably, the plurality? of elastic elements are spaced from each other according to a periodicity? predetermined.

Advantageously, this solution allows homogeneity? in the vibration of the system formed by the panels and the cavity, as well as an optimization in the distribution of loads and weights from a structural point of view.

Still preferably, both the first panel and the second panel and the plurality? of elastic elements are made of fireproof material.

Advantageously, there? allows you to increase the properties? flame retardant of the global multilayer panel by summing the characteristics of its components.

According to a preferred embodiment, the elastic elements comprise Z-shaped and/or S-shaped elements.

Advantageously, this type of elastic elements allows a maximization of the damping effect against a minimization of the overall thickness of the multilayer panel.

According to an alternative embodiment, the elastic elements comprise straight elements.

Advantageously, this type of elastic elements is particularly simple. productive as well as performing an excellent damping function.

According to a further alternative embodiment, the elastic elements consist of portions of the first panel shaped and folded towards the second panel and/or of portions of the second panel shaped and folded towards the first panel.

Advantageously, this embodiment is particularly robust, simple to make, optimal for the combination of elastic-insulating and fire-retardant characteristics of the multilayer panel and economical from the production point of view.

Alternatively, the elastic elements are connected to the first panel and the second panel by welding and/or gluing and/or fastening by means of fasteners.

Advantageously, this solution allows for greater differentiation of materials and greater freedom for use. from the point of view of the type of elastic elements to be used, to be particularly suited to the specific application envisaged.

Still preferably, at least one of the first panel and the second panel comprises a plurality of panels. of openings that put the interspace in fluid communication with the outside.

Advantageously, the openings can be distributed in a periodic or differentiated manner on the surface of the first and/or second panel and It is therefore possible to obtain acoustic insulation at certain controllable frequencies through the design of the shape and spacing of these openings.

Preferably the openings are made with a concave section, a convex section, rectilinear, or a combination of these.

Advantageously, these shapes are those that best combine the required effects with the needs? of production simplification.

Still preferably, the multilayer panel further comprises a structural stiffening mesh layer associated with at least one of the first panel and the second panel.

Advantageously, the mesh structure provides further stiffening of the multilayer panel, with a reduced addition of mass compared to a panel with a thickness equal to the multilayer panel considered more? the thickness of the net. This makes it possible to achieve the desired stiffness for acoustic insulation while limiting the weight of the overall panel.

Still preferably, the multilayer panel further comprises stiffening elements at one or more? connections of said plurality? of elastic elements.

Advantageously, this solution allows to obtain a localized stiffening for all the elastic elements or only in correspondence with some elastic elements subject to greater stress or to determine a different degree of acoustic insulation on the panel.

Preferably, the multilayer panel further comprises a layer of thermal insulating material associated with at least one of the first panel and the second panel.

Advantageously, this solution provides the multilayer panel with improved property heat insulating between environments including ? interposed.

Alternatively or in addition, the multilayer panel further comprises a third fireproof panel associated with at least one of the first panel and the second panel.

Advantageously, this solution guarantees an improved flame resistance of the multilayer panel at the cost of a limited overall weight reduction.

Advantageously, the use of a thermal insulating layer and/or a third fireproof panel guarantees an increase in the heating capacity. of sound insulation at all frequencies through a second mechanism of the mass-spring-mass type.

Preferably, the multilayer panel further comprises resonator elements associated directly or indirectly with at least one of the first panel and the second panel.

Advantageously, these resonator elements allow an increase in the capacitance? of acoustic insulation at specific frequencies due to the local resonances of the localized masses which behave as mechanical resonators, preferably but not limited to when in association with the aforementioned third fireproof panel.

Still preferably the first panel and the second panel are made of metallic material.

Advantageously, this solution allows to obtain excellent structural and fireproof characteristics of the multilayer panel, with also a production simplification.

Further features and advantages will become more apparent from the detailed description given hereinafter of preferred, non-limiting embodiments of the present invention, and from the dependent claims which outline preferred and particularly advantageous embodiments of the invention.

Brief description of the drawings

The invention? illustrated with reference to the following figures, provided by way of non-limiting example, in which:

- Figure 1 illustrates an embodiment of a multilayer panel according to the invention;

- Figure 2 shows an exploded view of the multilayer panel of Figure 1;

- Figures 3A, 3B and 3C illustrate three exemplary variants of elastic elements according to the invention;

- Figures 4A and 4B illustrate two further variants of the multilayer panel according to the invention;

- Figure 5 illustrates an alternative embodiment of a multilayer panel according to the invention;

- Figure 6 illustrates a further alternative embodiment of a multilayer panel according to the invention;

- Figures 7A and 7B illustrate a further alternative embodiment of a multilayer panel according to the invention;

- Figure 8 illustrates a further alternative embodiment of a multilayer panel according to the invention.

In the different figures, similar elements will be identified by similar reference numerals.

Detail description

With reference to the attached Figures 1 and 2, with 100 ? globally indicated is an embodiment of a multilayer fireproof acoustic insulation panel in accordance with the present invention.

The multilayer panel 100 comprises a first panel 101 and a second panel 102 facing and facing each other.

At least one of the first panel 101 and the second panel 102 ? made of fireproof material cos? to confer property? flame retardant to the multilayer panel 100.

By fireproof material we mean both a completely fireproof material and a partially fireproof material according to a defined fire reaction class.

Preferably both the first panel 101 and the second panel 102 are made of fireproof material.

Still preferably both the first panel 101 and the second panel 102 are made of the same fireproof material.

In the present exemplary but non-limiting embodiment, is the fireproof material ? a metallic material, preferably steel. Pi? preferably the first panel 101 and the second panel 102 are made starting from a sheet metal.

Nothing prevents you from using a material that ? been made fireproof by applying a specific product or paint on its surface.

Between the first panel 101 and the second panel 102 ? obtained a cavity 103.

The interspace 103 generally ? an air gap. Nothing prevents you from adopting a different fluid to obtain a better soundproofing effect.

The interspace 103 has a transversal dimension preferably between 1 mm and 1000 mm, even more? preferably equal to 40 mm, dimension optimized for the required sound-absorbing characteristics. However, nothing prevents the adoption of a different thickness of the cavity 103.

Further between the first panel 101 and the second panel 102 ? interposed a plurality? of elastic elements 104.

Specifically, the elastic elements 104 have a first end? 104A associated with an inner surface 101A of the first panel 101 and a second end? 104B associated with an internal surface 102A of the second panel 102.

Can these elastic elements 104 be connected through their own ends? 104A and 104B respectively to the first panel 101 and to the second panel 102 through welding, gluing, fastening by means of fastening elements, such as, for example, screws or rivets. ? Is it possible to adopt the same type of fastening for both ends? 104A and 104B or a different type of fastening for each.

The elastic elements 104 form point stiffeners for the two panels 101, 102, forming the multilayer panel 100 with greater flexural stiffness than the first panel 101 and the second panel 102 taken individually, thus providing an increase in the capacity? multilayer panel insulation 100.

Therefore, the elastic elements 104 make it possible to produce a multilayer panel 100 with a flexural stiffness comparable to that of an equivalent single panel of the same thickness as the multilayer panel 100 and of solid material, with a considerably lower weight.

According to a different aspect, the elastic elements 104 allow to create, in coupling with the interspace 103 and the first and second panels 101, 102, an ideal mass-spring mass system, in which the two masses are represented by the first panel 101 and by the second panel 102 , while the spring ? represented precisely by the association between the cavity 103 and the elastic elements 104. developed allows to obtain an excellent acoustic insulation between the rooms including the multilayer panel 100 ? interposed.

The elastic elements 104 in the embodiment shown are spaced apart according to a periodicity? predetermined.

Thereby ? Is it possible to obtain a correct and distributed isolation, optimizing also? the number of elastic elements 104 to be used, with a comparison also of an economic type.

Nothing forbids for? to adopt a different configuration with a greater density? of elastic elements 104 in specific portions of the first panel 101 and of the second panel 102 for specific needs, or simply adopt a random distribution.

The elastic elements 104 are preferably also made of fireproof material as well as to improve the property? flame retardant of the multilayer panel 100.

? It is possible to adopt the same fireproof material provided for the first panel 101 and/or for the second panel 102, or to adopt a different fireproof material.

Furthermore, the elastic elements 104, as visible in Figures 3A, 3B and 3C can have a different conformation.

Specifically, according to the exemplary and non-limiting embodiments shown, multilayer panels 300A, 300B, 300C are provided in which elastic elements 304A, 304B, 304C respectively in the shape of Z, in the shape of S or rectilinear elements are provided.

The different conformation is selected according to the needs? contingents of the various applications in terms of desired acoustic insulation, or in terms of thickness, or others.

Nothing prevents the provision of elastic elements 304A, 304B, 304C of different types and alternated in the same embodiment according to particular contingent requirements from the production and/or operational point of view.

According to an alternative embodiment, visible in particular in Figures 4A and 4B, a multilayer panel 400A, 400B is envisaged in which the elastic elements 104 are formed starting from portions of the first panel 101 and/or the second panel 102.

In particular, in predetermined portions 404A, 404B of the first panel 101 and/or of the second panel 102 ? a partial cut of a preferably but not limited to rectangular or quadrangular shape is made.

even more in particular, in the embodiment represented, ? made a cut along three contiguous sides of a rectangular shape, leaving the portion 404A, 404B of panel 101, 102 connected so defined only by the fourth side of the rectangular shape.

? it is therefore possible to make this portion 404A, 404B come out of the plane defined by the panel 101, 102 which contains it and fold it towards the other panel 401, 402 inside the gap 103.

The portion 404A, 404B protruding so? made can? then be adopted, cos? how?? or by subsequent specific processing, as an elastic element 404, connecting the end? free to the other panel 101, 102.

? It is possible to provide in the same embodiment elastic elements 404 made both by portions 404A, 404B of the first panel 101 and by portions 404A, 404B of the second panel 102.

? otherwise? It is possible to think of realizing a single elastic element 404 realized by connecting corresponding portions 404A, 404B of the first panel 101 and of the second panel 102 connected to each other.

In Figure 4A ? a variant is provided which provides portions 404A, which are all shaped and cut out in the same way. Differently, in Figure 4B ? the alternation of portions 404A with portions 404B rotated at right angles to the portions 404A is provided.

Nothing prevents the provision of further variants with different arrangements, or with different conformations of the shaped and folded portions, all of these variants being included within the scope of the attached claims.

In Figure 5 ? a further embodiment is represented, which provides for a multilayer panel 500 in which the first panel 501 comprises a plurality of of openings 503 which put the interspace 103 into fluid communication with the outside.

In the embodiment shown ? used the same second panel 102 with respect to previous embodiments.

? however, the same solution is provided only for a second panel (not shown), or even for both.

In this way, therefore, does the first panel 501 and/or the second panel work, do they increase their own properties? sound-absorbing panels by exploiting the principles of resonance.

Can these openings 503 be distributed according to a well-defined pattern or not, periodically with greater density? at some portions of the surface of the first panel 501 or of the second panel, all these variants being included in the scope defined in the attached claims.

Each opening 503, projected onto the plane of the first panel 501 or of the second panel, identifies a concave or convex shape. Preferably the form of such projections ? circular. Alternatively, the form of these projections ? slit.

The presence of the openings 503 allows acoustic insulation at certain frequencies which can be controlled through the design of the shape and spacing of the openings 503 themselves.

In Figure 6 ? further provided is an embodiment in which a multilayer panel 600 according to the invention comprises an associated mesh layer 601 at the internal surface 101A of the first panel 101 facing the interspace 103 or at an external surface 101B of the first panel 101 opposite in the interspace 103.

Similarly, ? It is possible to associate the mesh layer 601 with the internal surface 102A or with an external surface 102B of the second panel 102.

Preferably, the mesh layer 601 is associated with the first panel 101 or with the second panel 102 by welding or gluing connection.

Nothing prevents you from providing different types of connections more? or less permanent.

The mesh layer 606 provides additional stiffening of the panel 101, 102, with a reduced mass addition compared to a panel of thickness equal to the panel 101, 102 plus? the thickness of the mesh layer 601. This makes it possible to achieve the desired stiffness for acoustic insulation by limiting the weight of the panel 101, 102.

Furthermore, the use of the 601 mesh layer provides a non-negligible contribution as regards the isolation or isolation of high frequencies.

In Figures 7A and 7B ? shown a further alternative embodiment in which a multilayer panel 700 is provided which includes stiffening elements 701 on the internal surface 102A of the second panel 102, in correspondence with the connections with the elastic elements 104.

Nothing prevents the provision of such stiffening elements 701 on the internal surface 101A of the first panel 101, or on both internal surfaces 101A, 102A, always in correspondence with the connections with the elastic elements 104.

The adoption of the stiffening elements 701, which are nothing more than localized mass elements, clearly guarantees greater stiffening of the panels 101, 102 in correspondence with the connection elements 103, a characteristic to be evaluated according to the specific applications of the multilayer panel 700.

In Figure 8 ? An alternative embodiment of a multilayer panel 800 is shown.

The multilayer panel 800 further comprises, in addition to the first panel 101 and the second panel 102, also a layer of heat insulating material 801 associated with the external surface 101B of the first panel 101 opposite the interspace 103.

Obviously nothing prevents the layer of thermal insulating material 801 from being associated with the external surface 102B of the second panel 102.

Furthermore, nothing prevents the application of a second layer of thermal insulating material (not shown) so as to apply this material in association with both the first panel 101 and the second panel 102.

The thermal insulation layer 801 can? be made of rock wool or mineral wool, or another material with high thermal insulation and fire resistance performance.

The multilayer panel 800 also comprises a third fireproof panel 802 associated with the outer surface 101B of the first panel 101 opposite the interspace 103. Obviously nothing prevents the third fireproof panel 802 from being associated with the outer surface 102B of the second panel 102.

Furthermore, nothing prevents the application of a fourth fireproof panel (not shown) so as to have an additional layer associated with both the first panel 101 and the second panel 102.

Preferably the third fireproof panel ? made of metal material, or a material of density? at least double the material of the heat insulating material layer 801, and with high fire resistance.

Thanks to this third fireproof panel 802 are clearly increased the properties? flame retardant of the 800 multilayer panel.

The use of the layer of thermal insulating material 801 and/or the third fireproof panel 802 allows to increase the capacity? isolation across the entire frequency spectrum by means of a second mass-spring-mass mechanism.

The multilayer panel 800 further comprises resonator elements 803 associated with at least one of the first panel 101 and the second panel 102.

In the embodiment shown, the resonator elements 803 are associated indirectly with the outer surface 101B of the first panel 101 opposite the interspace 103 through the interposition of the third fireproof panel 802 to which they are directly connected.

Obviously, nothing prevents associating resonator elements 803 with the external surface 102B of the second panel 102, or with an internal surface 101A, 102A of the first panel 101 or with the second panel 102.

Furthermore, nothing prevents the application of resonator elements 803 both to the first panel 101 and to the second panel 102.

Still further, as mentioned, nothing prevents associating the resonator elements 803 directly on the first panel 101 and/or on the second panel 102. can? also take place in the presence, for example, of the third fireproof panel 802, with the resonator elements 803 interposed between one of the first panel 101 and the second panel 102 and the third fireproof panel 803.

The resonator elements 803 act in a targeted manner on the acoustic insulation of specific frequencies thanks to the local resonances of the localized masses of the resonator elements 803 which interact with the layer, preferably metallic, on which they are applied.

The resonator elements 803 are nothing more than localized massive components, which in the embodiment shown are constituted by bolts, but which can be constituted by different elements suitable for carrying out the same function.

Nothing prevents the provision of a multilayer panel in which the characteristics of the multilayer panel 800 are used individually.

In fact, the supplementary layers are not interdependent on each other to carry out their own specific additional function.

In the same way therefore, nothing prevents the association of these layers also with different embodiments described above where there are no incompatibilities? techniques.

Applicability? industrial

Advantageously, the present invention allows to obtain an excellent sound attenuation, also with reduced dimensions, in particular in terms of thickness. There? it also involves a limited weight, a requirement which in many cases is particularly stringent in the design phase. To there? there are also flame retardant characteristics given by the materials used for the panels and preferably also by the elastic elements interposed between them.

There are obviously also significant advantages given by the simplicity? from the production point of view of the multilayer panel according to the invention, which does not require particular characteristics for the production tools.

Among the applications of the present invention, technical applications are considered in which it is necessary to provide acoustic insulation between rooms and in which additional features of lightness and high fire resistance are required. Among these, naval applications and aeronautical applications are very relevant, even if not of unique destination, which have specific needs? also in terms of safety.

Considering the description given here, the person skilled in the art will be able to devising further modifications and variations, in order to satisfy contingent and specific needs.

? evident, as anticipated above, that, where there are no incompatibilities? techniques evident to the person skilled in the art, the configurations of specific elements described with reference to certain embodiments, can be used in other embodiments described herein.

For example, ? It is possible to provide a multilayer panel which comprises a mesh layer at an internal surface of one of the two panels and a layer of heat insulating material on an external layer of the same panel or of the opposite panel. ? also possible to predict as said pi? heat insulating layers.

Further ? Is it possible to provide, for example, resonator elements placed in correspondence with one of the two panels opposite to the one on which it is located? associated with a third fireproof panel, differently from the illustrated exemplary form.

The embodiments described herein are therefore to be understood as illustrative and non-limiting examples of the invention.

Claims (15)

1. Multilayer panel (100, 300A, 300B, 300C, 400A, 400B, 500, 600, 700, 800) fireproof for acoustic insulation comprising a first panel (101, 501) and a second panel (102) facing each other the other, at least one of said first panel (101, 501) and said second panel (102) being made of fireproof material, a cavity layer (103) being interposed between said first panel (101, 501) and said second panel (102, 501), said first panel (101, 501) and said second panel (102) being interconnected by a plurality of of elastic elements (104, 304A, 304B, 304C) spaced apart from each other, said plurality? of elastic elements (104, 304A, 304B, 304C) each providing a first end? (104A) connected to an inner surface (101A) of said first panel (101, 501) and a second end? (104B) connected to an inner surface (102A) of said second panel (102). 2. Multilayer panel (100, 300A, 300B, 300C, 400A, 400B, 500, 600, 700, 800) fireproof for acoustic insulation according to claim 1, wherein said plurality? of elastic elements (104, 304A, 304B, 304C) are spaced apart according to a periodicity? predetermined. 3. Multilayer panel (100, 300A, 300B, 300C, 400A, 400B, 500, 600, 700, 800) fireproof for acoustic insulation according to claim 1 or 2, wherein both said first panel (101, 501) and said second panel (102) is called plurality? of elastic elements (104, 304A, 304B, 304C) are made of fireproof material. 4. Multilayer fireproof acoustic insulation panel (300A, 300B) according to any one of claims 1 to 3, wherein said elastic elements (304A, 304B) comprise Z-shaped and/or S-shaped elements. The multilayer fireproof soundproofing panel (300C) according to any one of claims 1 to 4, wherein said elastic elements (304C) comprise straight elements. 6. Multilayer fireproof acoustic insulation panel (400A, 400B) according to any one of claims 1 to 5, wherein said elastic elements (404) consist of shaped and folded portions (404A, 404B) of said first panel (101) towards said second panel (102) and/or from portions (404A, 404B) of said second panel (102) shaped and folded towards said first panel (101). 7. Fireproof soundproofing multilayer panel (100, 300A, 300B, 300C, 500, 600, 700, 800) according to any one of claims 1 to 5, wherein said elastic elements (104, 304A, 304B, 304C) are connected to said first panel (101) and to said second panel (102) by welding and/or gluing and/or fixing by means of fixing elements. The multilayer fireproof soundproofing panel (500) according to any one of claims 1 to 7, wherein at least one of said first panel (501) and said second panel comprises a plurality of of openings (503) which put said interspace (103) into fluid communication with the outside. The multilayer fireproof acoustic insulation panel (500) according to claim 8, wherein said openings (503) are made of concave section, convex section, rectilinear, or a combination thereof. 10. Multilayer fireproof soundproofing panel (600) according to any one of claims 1 to 9, further comprising a structural stiffening mesh layer (601) associated with at least one of said first panel (101) and said second panel (102 ). The multi-layer fireproof soundproofing panel (700) according to any one of claims 1 to 10, further comprising stiffening members (701) at one or more? connections of said plurality? elastic elements (104). The multilayer fireproof soundproofing panel (800) according to any one of claims 1 to 11, further comprising a layer of thermal insulating material (801) associated with at least one of said first panel (101) and said second panel (102). The multilayer fireproof soundproofing panel (800) according to any one of claims 1 to 12, further comprising a third fireproof panel (802) associated with at least one of said first panel (101) and said second panel (102). The multilayer fireproof soundproofing panel (800) according to any one of claims 1 to 13, further comprising resonator elements (803) directly or indirectly associated with at least one of said first panel (101) and said second panel (102). 15. Multilayer panel (100, 300A, 300B, 300C, 400A, 400B, 500, 600, 700, 800) fireproof for acoustic insulation according to any one of claims 1 to 14, wherein said first panel (101, 501) is said second panel (102) are made of metallic material.