WO2022013274A1 - Sound-insultation fireproof multilayer panel - Google Patents

Sound-insultation fireproof multilayer panel Download PDF

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Publication number
WO2022013274A1
WO2022013274A1 PCT/EP2021/069567 EP2021069567W WO2022013274A1 WO 2022013274 A1 WO2022013274 A1 WO 2022013274A1 EP 2021069567 W EP2021069567 W EP 2021069567W WO 2022013274 A1 WO2022013274 A1 WO 2022013274A1
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WO
WIPO (PCT)
Prior art keywords
panel
sound
elastic elements
elements
multilayer
Prior art date
Application number
PCT/EP2021/069567
Other languages
French (fr)
Inventor
Luca D'ALESSANDRO
Simone MEDURI
Original Assignee
Phononic Vibes S.R.L.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Phononic Vibes S.R.L. filed Critical Phononic Vibes S.R.L.
Priority to EP21743178.2A priority Critical patent/EP4182162A1/en
Publication of WO2022013274A1 publication Critical patent/WO2022013274A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/02—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions
    • B32B3/06—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions for securing layers together; for attaching the product to another member, e.g. to a support, or to another product, e.g. groove/tongue, interlocking
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/043—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/14—Layered products comprising a layer of metal next to a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/18—Layered products comprising a layer of metal comprising iron or steel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/02—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions
    • B32B3/08—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions characterised by added members at particular parts
    • B32B3/085—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions characterised by added members at particular parts spaced apart pieces on the surface of a layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/266—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by an apertured layer, the apertures going through the whole thickness of the layer, e.g. expanded metal, perforated layer, slit layer regular cells B32B3/12
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/30—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer formed with recesses or projections, e.g. hollows, grooves, protuberances, ribs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/05—Interconnection of layers the layers not being connected over the whole surface, e.g. discontinuous connection or patterned connection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/08—Interconnection of layers by mechanical means
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
    • E04B1/82—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
    • E04B1/84—Sound-absorbing elements
    • E04B1/86—Sound-absorbing elements slab-shaped
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/92—Protection against other undesired influences or dangers
    • E04B1/94—Protection against other undesired influences or dangers against fire
    • E04B1/941—Building elements specially adapted therefor
    • E04B1/942—Building elements specially adapted therefor slab-shaped
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/162—Selection of materials
    • G10K11/168—Plural layers of different materials, e.g. sandwiches
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/172—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using resonance effects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/10—Inorganic fibres
    • B32B2262/101—Glass fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/10—Inorganic fibres
    • B32B2262/108—Rockwool fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/10—Properties of the layers or laminate having particular acoustical properties
    • B32B2307/102—Insulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/304—Insulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/306—Resistant to heat
    • B32B2307/3065—Flame resistant or retardant, fire resistant or retardant
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/546—Flexural strength; Flexion stiffness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2605/00—Vehicles
    • B32B2605/12—Ships
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2605/00—Vehicles
    • B32B2605/18—Aircraft

Definitions

  • the present invention relates to a sound-insulation fireproof multilayer panel, preferably for both high frequency and low frequency sound components.
  • the present invention is widely used in technical applications where it is necessary both to provide a sound insulation among environments and to ensure high fire resistance, therefore particularly, but not limited to, naval and aeronautical applications.
  • weight requirements which are often well defined, for example, for internal and external components of aeronautical aircrafts.
  • US patent application US 2005/ 194210 A1 describes, for example, an apparatus for reducing noise in an aircraft cabin comprising a portion of a structure and honeycomb filler material.
  • the Chinese utility model CN 203,714,147 U describes a fireproof and soundproofing sandwich structure made from flame-retardant material squeezed between two plates.
  • the Chinese utility model CN 207,244,993 U alternatively describes a sandwich structure with soundproofing material interposed between two plates.
  • the Chinese utility model CN 206,312,564 U describes a sound insulation and noise reduction board, which includes a sound absorption layer, a shock absorption layer, a sound insulation layer, a fiberglass cloth, and two first steel wire mesh, all overlapped.
  • the Chinese Patent CN 106,782,482 A describes a composite sound absorbing and insulating board, both with a multi-layer structure, wherein an air layer is arranged between two panel honeycomb sandwich layers and elastic damping layers arranged between a fireproof layer and a sound absorption layer and between the sound absorption layer and a sound insulation layer.
  • the devices described in the prior art still have certain drawbacks, which may be represented by an imperfect sound insulation, more difficult applicability for certain specific applications, excessive dimensions and weight of the attenuating device thus conceived, or by excessive constructive complexity. Summary of the invention
  • An object of the present invention is to obviate the drawbacks of the prior art.
  • a particular object of the present invention is to make an acoustically insulating device suitable for applications where weight and fire resistance requirements are also of primary importance.
  • a further special object of the present invention is to achieve an optimisation of the characteristics of the attenuating device.
  • Another object is to provide a device which has overall characteristics that are higher than those of the sum of the individual components thanks to a synergistic effect between them.
  • An idea underlying the present invention is to provide a sound- insulation fireproof multilayer 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, an interspace layer being interposed between the first panel and the second panel.
  • the first panel and the second panel are interconnected by a plurality of elastic elements that are spaced apart from each other, such plurality of elastic elements providing each 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.
  • the first panel, the second panel and the plurality of elastic elements are made of fireproof material.
  • plural of elastic elements refers to two or more elements which have elastic, or analogously resilient, properties, i.e. they can be deformed under an action of a force and they can return in their previous configuration when said action of a force ends.
  • a force can be produced also from sound waves.
  • the interspace is an air interspace. There is nothing to prevent the use of a different fluid, or the inclusion of soundproofing and fireproof material to achieve a better sound- insulation effect.
  • this solution allows to obtain sound insulation that can be attributed to the operation of an ideal mass-spring-mass system, where the masses consist of the first and second panel and the spring consists of the combination of elastic elements and the interspace.
  • This mass-spring-mass mechanism exploits the dynamic characteristics of the stratigraphy to provide greater sound insulation than single-layer insulation elements, which are characterized by performances based solely on the mass of the component.
  • the combined use of the interspace with the elastic elements in combination makes it possible to obtain an effect over the entire spectrum of audible frequencies, without inconveniences due to the resonance of the wall at low frequencies and the effect of coincidence between tangential components of the incident sound wave and the resonance frequency of the flexural waves of the wall at high frequencies.
  • the elastic elements result in a multilayer panel with a flexural stiffness that is comparable to that of an equivalent single panel having a thickness equal to the multilayer panel and made of solid material, with a considerably lower weight.
  • This is obviously particularly preferred for applications that require lightweight components as a specific requirement, such as aeronautical ones.
  • the plurality of elastic elements are spaced apart from each other according to a predetermined periodicity.
  • this solution allows homogeneity in the vibration of the system formed by the panels and by the interspace, as well as an optimization in the distribution of the loads and of the weights from the structural point of view.
  • the elastic elements comprise Z- shaped and/or S-shaped elements.
  • this type of elastic element allows a maximisation of the damping effect while minimising the overall thickness of the multilayer panel.
  • the elastic elements comprise straight elements.
  • this type of elastic elements is of particular manufacturing simplicity as well as performs an excellent damping function.
  • the elastic elements consist of portions of the first panel which are shaped and folded towards the second panel and / or of portions of the second panel which are shaped and folded towards the first panel.
  • this embodiment is particularly robust, easy to manufacture, optimal for the combination of elastic-insulating and fireproof characteristics of the multilayer panel and economical from the production point of view.
  • the elastic elements are connected to the first panel and to the second panel by welding and/or gluing and/or fixing by means of fixing elements.
  • this solution allows a greater differentiation of materials and a greater freedom in terms of the type of elastic elements to be adopted, in order to be particularly suited to the specific application envisaged.
  • At least one of the first panel and the second panel comprises a plurality of openings that put the interspace in fluid communication with the outside.
  • 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 achieve sound insulation at certain frequencies that can be controlled by designing the shape and the spacing of these openings.
  • the openings are made with a concave section, a convex section, rectilinear, or a combination thereof.
  • the multilayer panel further comprises a structural stiffening mesh layer that is associated with at least one of the first panel and the second panel.
  • the mesh structure provides additional stiffening of the multilayer panel, with a reduced addition of mass compared to a panel having a thickness equal to the multilayer panel considered plus the thickness of the mesh. This allows the desired stiffness for sound insulation to be achieved while limiting the weight of the overall panel.
  • the multilayer panel further comprises stiffening elements at one or more connections of said plurality of elastic elements.
  • this solution makes it possible to obtain a localised stiffening for all the elastic elements or only at certain elastic elements that are subject to greater stress or to determine a different degree of sound insulation on the panel.
  • the multilayer panel further comprises a layer of thermal insulation material that is associated with at least one of the first panel and the second panel.
  • this solution provides the multilayer panel with improved thermal insulation properties between the environments between which it is interposed.
  • the multilayer panel further comprises a third fireproof panel that is associated with at least one of the first panel and the second panel.
  • this solution provides an improved flame-retardant resistance of the multilayer panel at the price of a small overall weight reduction.
  • the use of a thermal insulation layer and/or a third fireproof panel guarantees an increase in the sound insulation capacity at all frequencies through a second mechanism of the mass-spring- mass type.
  • the multilayer panel further comprises resonator elements that are directly or indirectly associated with at least one of the first panel and the second panel.
  • these resonator elements allow for an increase in sound insulation capacity at specific frequencies due to the local resonances of the localised masses which act as mechanical resonators, preferably but not limitedly when in association with the aforesaid third fireproof panel.
  • first panel and the second panel are made of metallic material.
  • this solution allows to obtain excellent structural, fireproof characteristics of the multilayer panel, with a simplification of production as well.
  • Figure 1 illustrates an embodiment of a multilayer panel according to the invention
  • Figure 2 illustrates 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
  • FIGS. 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.
  • 100 generally indicates an embodiment of a sound-insulation fireproof multilayer panel in accordance with the present invention.
  • the multilayer panel 100 comprises a first panel 101 and a second panel 102 turned and facing each other.
  • At least one of the first panel 101 and the second panel 102 is made of a fireproof material so as to give flame-retardant properties to the multilayer panel 100.
  • a fireproof material is either a completely fireproof material or a partially fireproof material according to a defined reaction to fire class.
  • both the first panel 101 and the second panel 102 are made of fireproof material.
  • both the first panel 101 and the second panel 102 are made of the same fireproof material.
  • the fireproof material is a metallic material, preferably steel. More preferably, the first panel 101 and the second panel 102 are made starting from a sheet metal.
  • An interspace 103 is formed between the first panel 101 and the second panel 102.
  • the interspace 103 is generally an air interspace. None prevents from using a different fluid to achieve a better sound-insulation effect.
  • the interspace 103 has a transverse dimension preferably comprised between 1 mm and 1000 mm, even more preferably 40 mm, which is an optimised dimension for the required sound absorption characteristics. However, nothing prevents from using a different thickness of interspace 103.
  • a plurality of elastic elements 104 is interposed between the first panel 101 and the second panel 102.
  • the elastic elements 104 provide a first end 104A that is associated with an internal surface 101A of the first panel 101 and a second end 104B that is associated with an internal surface 102 A of the second panel 102.
  • Such elastic elements 104 may be connected by their ends 104A and 104B to the first panel 101 and to the second panel 102 respectively by welding, gluing, fixing by means of fixing elements, such as, for example, screws or rivets. It is possible to adopt the same type of fixing for both ends 104A and 104B or a different type of fixing for each of them.
  • the elastic elements 104 constitute point stiffenings 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 insulating capacity of the multilayer panel 100.
  • the elastic elements 104 make it possible to realise a multilayer panel 100 with a flexural stiffness comparable to that of an equivalent single panel having the same thickness as the multilayer panel 100 and made of solid material, while weighing considerably less.
  • the elastic elements 104 make it possible to realise by coupling with the interspace 103 and the first and second panel 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 is represented by the association between the interspace 103 and the elastic elements 104.
  • the system thus developed makes it possible to achieve excellent sound insulation between the environments between which the multilayer panel 100 is interposed.
  • the elastic elements 104 in the represented embodiment are spaced apart from each other according to a predetermined periodicity.
  • the elastic elements 104 are preferably also made of fireproof material in order to improve the flame-retardant property of the multilayer panel 100.
  • the elastic elements 104 may have a different conformation.
  • multilayer panels 300A, 300B, 300C are envisaged in which elastic elements 304A, 304B, 304C are provided which are respectively Z-shaped, S-shaped or straight elements.
  • the different conformation is selected according to the contingent needs of the various applications in terms of the desired sound insulation, or in terms of thickness, or others.
  • a multilayer panel 400A, 400B in which the elastic elements 104 are formed from portions of the first panel 101 and/or the second panel 102.
  • predetermined portions 404A, 404B of the first panel 101 and/or the second panel 102 a partial cut of a preferably but not limitedly rectangular or quadrangular shape is made.
  • a cut is made along three contiguous sides of a rectangular template, leaving the portion 404A, 404B of panel 101, 102 thus defined only connected by means of the fourth side of the rectangular template.
  • the protruding portion 404A, 404B thus made can then be adopted, as it is or by subsequent specific processing, as an elastic element 404, connecting the free end to the other panel 101, 102.
  • elastic elements 404 it is possible to provide in the same embodiment for elastic elements 404 to be made both from portions 404A, 404B of the first panel 101 and from portions 404A, 404B of the second panel 102.
  • FIG 4A there is provided a variant providing portions 404A, which are all shaped and cut in the same way.
  • Figure 4B there is provided the alternation of portions 404A with portions that are rotated 404B at right angles with respect to the portions 404A.
  • Figure 5 depicts a further embodiment providing a multilayer panel 500 in which the first panel 501 comprises a plurality of openings 503 that put the interspace 103 in fluid communication with the outside.
  • the first panel 501 and/or the second panel work to increase their own sound-absorbing properties of the panels by exploiting the resonance principles.
  • openings 503 may be distributed according to a well-defined pattern or not, in a periodic manner with greater density at certain portions of the surface of the first panel 501 or the second panel, all such variations being within the scope defined in the appended claims.
  • Each opening 503, projected onto the plane of the first panel 501 or the second panel, identifies a concave or convex shape.
  • the shape of these projections is circular.
  • the shape of these projections is slit-shaped.
  • the presence of the openings 503 allows sound insulation at certain frequencies that can be controlled by designing the shape and the spacing of the openings 503 themselves.
  • Figure 6 further provides an embodiment in which a multilayer panel 600 according to the invention comprises a mesh layer 601 that is associated at an internal surface 101A of the first panel 101 facing the interspace 103 or on an external surface 10 IB of the first panel 101 opposite the interspace 103.
  • the mesh layer 601 may be associated with an internal surface 102A or an external surface 102B of the second panel 102.
  • the mesh layer 601 is associated with the first panel 101 or the second panel 102 by welding or gluing connection.
  • the use of the mesh layer 601 provides a non-negligible contribution as regards insulation or high frequency insulation.
  • a further alternative embodiment is shown in which a multilayer panel 700 is provided which comprises stiffening elements 701 on the internal surface 102 A of the second panel 102, at the connections with the elastic elements 104.
  • stiffening elements 701 are nothing more than localised mass elements, clearly guarantees a greater stiffening of the panels 101, 102 at the connection elements 103, a characteristic to be evaluated according to the specific applications of the multilayer panel 700.
  • Figure 8 shows an alternative embodiment of a multilayer panel 800.
  • the multilayer panel 800 further comprises, in addition to the first panel 101 and the second panel 102, also a layer of thermal insulation material 801 that is associated with the external surface 10 IB of the first panel 101 opposite the interspace 103. Obviously, nothing prevents the layer of thermal insulation material 801 from being associated with the external surface 102B of the second panel 102.
  • the use of the layer of thermal insulation material 801 and/or of the third fireproof panel 802 makes it possible to increase the insulation capacity over the entire frequency spectrum by means of a second mass-spring-mass mechanism.
  • the resonator elements 803 are nothing more than massive localised components, which in the embodiment shown consist of bolts, but which may consist of different elements suitable for performing the same function.
  • the additional layers are not interdependent on each other to perform their specific additional function.
  • the present invention makes it possible to obtain very good sound attenuation, with also reduced dimensions, particularly in terms of thickness.
  • This also means a low weight, a requirement that is particularly stringent in many cases at the design stage.
  • This is supplemented by the flame-retardant characteristics of the materials used for the panels and preferably also for the elastic elements that are interposed between them.

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Abstract

The present invention refers to a sound-insulation fireproof multilayer panel (100, 300A, 300B, 300C, 400A, 400B, 500, 600, 700, 800) comprising a first panel (101, 501) and a second panel (102) facing each other, at least one of the first panel (101, 501) and the second panel (102) being made of fireproof material. An interspace layer (103) is interposed between the first panel (101, 501) and the second panel (102, 501). The first panel (101, 501) and the second panel (102) are interconnected by a plurality of elastic elements (104, 304A, 304B, 304C) that are spaced apart from each other. Said plurality of elastic elements (104, 304A, 304B, 304C) provide each a first end (104A) connected to an internal surface (101 A) of the first panel (101, 501) and a second end (104B) connected to an internal surface (102 A) of the second panel (102), wherein the first panel (101, 501), the second panel (102) and the plurality of elastic elements (104, 304A, 304B, 304C) are made of fireproof material.

Description

Title: Sound-insulation fireproof multilayer panel
DESCRIPTION
Technical field
The present invention relates to a sound-insulation fireproof multilayer panel, preferably for both high frequency and low frequency sound components.
In general, the present invention is widely used in technical applications where it is necessary both to provide a sound insulation among environments and to ensure high fire resistance, therefore particularly, but not limited to, naval and aeronautical applications.
Prior art
Within the present technical field, different needs, even very heterogeneous between them, are merged, but all of which must necessarily be carried out in order to fall within specific operating requirements.
Therefore, if on the one hand instruments that can attenuate or inhibit the propagation of sound are studied, on the other hand it is often necessary to find solutions that can combine different requirements of a different nature, such as structural resistance or fire resistance in the presence of significant mechanical or thermal stress.
To all this, requirements of still different type can be further added such as weight requirements, which are often well defined, for example, for internal and external components of aeronautical aircrafts.
The components that are most affected by this type of common requirement are clearly those related to the external and internal structure of aircrafts and environments, these components being indispensable and therefore adopted extensively in all embodiments within the aforesaid technical applications.
Various solutions and devices have therefore been developed in an attempt to find a solution which is optimised for all the contemporary requirements to be met by the structural elements, which solutions are particularly related to the wall structure adopted.
US patent application US 2005/ 194210 A1 describes, for example, an apparatus for reducing noise in an aircraft cabin comprising a portion of a structure and honeycomb filler material.
The Chinese utility model CN 203,714,147 U, on the other hand, describes a fireproof and soundproofing sandwich structure made from flame-retardant material squeezed between two plates.
The Chinese utility model CN 207,244,993 U alternatively describes a sandwich structure with soundproofing material interposed between two plates. The Chinese utility model CN 206,312,564 U describes a sound insulation and noise reduction board, which includes a sound absorption layer, a shock absorption layer, a sound insulation layer, a fiberglass cloth, and two first steel wire mesh, all overlapped.
The Chinese Patent CN 106,782,482 A describes a composite sound absorbing and insulating board, both with a multi-layer structure, wherein an air layer is arranged between two panel honeycomb sandwich layers and elastic damping layers arranged between a fireproof layer and a sound absorption layer and between the sound absorption layer and a sound insulation layer. The devices described in the prior art still have certain drawbacks, which may be represented by an imperfect sound insulation, more difficult applicability for certain specific applications, excessive dimensions and weight of the attenuating device thus conceived, or by excessive constructive complexity. Summary of the invention
An object of the present invention is to obviate the drawbacks of the prior art.
A particular object of the present invention is to make an acoustically insulating device suitable for applications where weight and fire resistance requirements are also of primary importance.
A further special object of the present invention is to achieve an optimisation of the characteristics of the attenuating device.
Another object is to provide a device which has overall characteristics that are higher than 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 sound-insulation fireproof multilayer panel according to the characteristics of the attached claims which form an integral part of this description.
An idea underlying the present invention is to provide a sound- insulation fireproof multilayer 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, an interspace layer being interposed between the first panel and the second panel. The first panel and the second panel are interconnected by a plurality of elastic elements that are spaced apart from each other, such plurality of elastic elements providing each 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. The first panel, the second panel and the plurality of elastic elements are made of fireproof material.
Through the description the terms “plurality of elastic elements” refers to two or more elements which have elastic, or analogously resilient, properties, i.e. they can be deformed under an action of a force and they can return in their previous configuration when said action of a force ends. In particular, in this specific context, a force can be produced also from sound waves.
Generally, but not limited to, the interspace is an air interspace. There is nothing to prevent the use of a different fluid, or the inclusion of soundproofing and fireproof material to achieve a better sound- insulation effect.
Advantageously, this solution allows to obtain sound insulation that can be attributed to the operation of an ideal mass-spring-mass system, where the masses consist of the first and second panel and the spring consists of the combination of elastic elements and the interspace. This mass-spring-mass mechanism exploits the dynamic characteristics of the stratigraphy to provide greater sound insulation than single-layer insulation elements, which are characterized by performances based solely on the mass of the component.
Advantageously, the combined use of the interspace with the elastic elements in combination, compared to the use of a single-layer panel, makes it possible to obtain an effect over the entire spectrum of audible frequencies, without inconveniences due to the resonance of the wall at low frequencies and the effect of coincidence between tangential components of the incident sound wave and the resonance frequency of the flexural waves of the wall at high frequencies.
This is combined with the flame-retardant characteristic conferred by the flame-retardant properties of the overall multilayer panel by adding to the characteristics of the components thereof, thus making the multilayer panel structured in this way suitable for applications where it is provided that these requirements must be met simultaneously.
Further advantageously, the elastic elements result in a multilayer panel with a flexural stiffness that is comparable to that of an equivalent single panel having a thickness equal to the multilayer panel and made of solid material, with a considerably lower weight. This is obviously particularly preferred for applications that require lightweight components as a specific requirement, such as aeronautical ones.
Preferably, the plurality of elastic elements are spaced apart from each other according to a predetermined periodicity.
Advantageously, this solution allows homogeneity in the vibration of the system formed by the panels and by the interspace, as well as an optimization in the distribution of the loads and of the weights from the structural point of view.
According to a preferred embodiment, the elastic elements comprise Z- shaped and/or S-shaped elements.
Advantageously, this type of elastic element allows a maximisation of the damping effect while minimising 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 of particular manufacturing simplicity as well as performs an excellent damping function.
According to a further alternative embodiment, the elastic elements consist of portions of the first panel which are shaped and folded towards the second panel and / or of portions of the second panel which are shaped and folded towards the first panel.
Advantageously, this embodiment is particularly robust, easy to manufacture, optimal for the combination of elastic-insulating and fireproof characteristics of the multilayer panel and economical from the production point of view. Alternatively, the elastic elements are connected to the first panel and to the second panel by welding and/or gluing and/or fixing by means of fixing elements.
Advantageously, this solution allows a greater differentiation of materials and a greater freedom in terms of the type of elastic elements to be adopted, in order 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 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 achieve sound insulation at certain frequencies that can be controlled by designing the shape and the spacing of these openings.
Preferably the openings are made with a concave section, a convex section, rectilinear, or a combination thereof.
Advantageously, these shapes are those that best combine the required effects with the need for simplification of production. Still preferably, the multilayer panel further comprises a structural stiffening mesh layer that is associated with at least one of the first panel and the second panel.
Advantageously, the mesh structure provides additional stiffening of the multilayer panel, with a reduced addition of mass compared to a panel having a thickness equal to the multilayer panel considered plus the thickness of the mesh. This allows the desired stiffness for sound insulation to be achieved 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 makes it possible to obtain a localised stiffening for all the elastic elements or only at certain elastic elements that are subject to greater stress or to determine a different degree of sound insulation on the panel.
Preferably, the multilayer panel further comprises a layer of thermal insulation material that is associated with at least one of the first panel and the second panel.
Advantageously, this solution provides the multilayer panel with improved thermal insulation properties between the environments between which it is interposed.
Alternatively or additionally, the multilayer panel further comprises a third fireproof panel that is associated with at least one of the first panel and the second panel.
Advantageously, this solution provides an improved flame-retardant resistance of the multilayer panel at the price of a small overall weight reduction.
Advantageously, the use of a thermal insulation layer and/or a third fireproof panel guarantees an increase in the sound insulation capacity at all frequencies through a second mechanism of the mass-spring- mass type.
Preferably, the multilayer panel further comprises resonator elements that are directly or indirectly associated with at least one of the first panel and the second panel.
Advantageously, these resonator elements allow for an increase in sound insulation capacity at specific frequencies due to the local resonances of the localised masses which act as mechanical resonators, preferably but not limitedly when in association with the aforesaid 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, fireproof characteristics of the multilayer panel, with a simplification of production as well.
Further features and advantages will become more apparent from the detailed description below of preferred, non-limiting embodiments of the present invention, and the dependent claims outlining preferred, particularly advantageous embodiment of the invention.
Brief description of the drawings
The invention is illustrated by reference to the following figures, provided by way of non-limiting example, wherein:
Figure 1 illustrates an embodiment of a multilayer panel according to the invention;
Figure 2 illustrates 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 numbers.
Detailed description
With reference to the accompanying Figures 1 and 2, 100 generally indicates an embodiment of a sound-insulation fireproof multilayer panel in accordance with the present invention.
The multilayer panel 100 comprises a first panel 101 and a second panel 102 turned and facing each other.
At least one of the first panel 101 and the second panel 102 is made of a fireproof material so as to give flame-retardant properties to the multilayer panel 100.
A fireproof material is either a completely fireproof material or a partially fireproof material according to a defined reaction to fire 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 this exemplary but non-limiting embodiment the fireproof material is a metallic material, preferably steel. More preferably, the first panel 101 and the second panel 102 are made starting from a sheet metal.
Nothing prevents from using a material that has been made fireproof by affixing a specific product or paint on the surface thereof. An interspace 103 is formed between the first panel 101 and the second panel 102.
The interspace 103 is generally an air interspace. Nothing prevents from using a different fluid to achieve a better sound-insulation effect. The interspace 103 has a transverse dimension preferably comprised between 1 mm and 1000 mm, even more preferably 40 mm, which is an optimised dimension for the required sound absorption characteristics. However, nothing prevents from using a different thickness of interspace 103. Further, a plurality of elastic elements 104 is interposed between the first panel 101 and the second panel 102.
Specifically, the elastic elements 104 provide a first end 104A that is associated with an internal surface 101A of the first panel 101 and a second end 104B that is associated with an internal surface 102 A of the second panel 102.
Such elastic elements 104 may be connected by their ends 104A and 104B to the first panel 101 and to the second panel 102 respectively by welding, gluing, fixing by means of fixing elements, such as, for example, screws or rivets. It is possible to adopt the same type of fixing for both ends 104A and 104B or a different type of fixing for each of them.
The elastic elements 104 constitute point stiffenings 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 insulating capacity of the multilayer panel 100.
Thus, the elastic elements 104 make it possible to realise a multilayer panel 100 with a flexural stiffness comparable to that of an equivalent single panel having the same thickness as the multilayer panel 100 and made of solid material, while weighing considerably less.
According to a different aspect, the elastic elements 104 make it possible to realise by coupling with the interspace 103 and the first and second panel 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 is represented by the association between the interspace 103 and the elastic elements 104. The system thus developed makes it possible to achieve excellent sound insulation between the environments between which the multilayer panel 100 is interposed.
The elastic elements 104 in the represented embodiment are spaced apart from each other according to a predetermined periodicity.
In this way, it is possible to achieve a correct and distributed insulation, by also optimising the number of elastic elements 104 to be used, which is also cost-effective.
However, nothing prevents from adopting a different configuration with a higher density of elastic elements 104 in specific portions of the first panel 101 and of the second panel 102 for specific requirements, or simply from adopting a distribution of the random type.
The elastic elements 104 are preferably also made of fireproof material in order to improve the flame-retardant property 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 use a different fireproof material.
Additionally, the elastic elements 104, as visible in Figures 3A, 3B and 3C may have a different conformation.
Specifically, according to the exemplified and non-limiting embodiments shown, multilayer panels 300A, 300B, 300C are envisaged in which elastic elements 304A, 304B, 304C are provided which are respectively Z-shaped, S-shaped or straight elements.
The different conformation is selected according to the contingent needs of the various applications in terms of the desired sound insulation, or in terms of thickness, or others.
Nothing prevents elastic elements 304A, 304B, 304C of different types from also being provided alternately in the same embodiment, depending on particular and contingent requirements from a production and/or operational point of view.
According to an alternative embodiment, particularly visible in Figures 4A and 4B, there is provided a multilayer panel 400A, 400B in which the elastic elements 104 are formed 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 the second panel 102 a partial cut of a preferably but not limitedly rectangular or quadrangular shape is made.
Even more particularly, in the embodiment shown, a cut is made along three contiguous sides of a rectangular template, leaving the portion 404A, 404B of panel 101, 102 thus defined only connected by means of the fourth side of the rectangular template.
It is therefore possible to take this portion 404A, 404B out of the plane defined by the panel 101, 102 containing it and fold it towards the other panel 401, 402 inside the interspace 103.
The protruding portion 404A, 404B thus made can then be adopted, as it is or by subsequent specific processing, as an elastic element 404, connecting the free end to the other panel 101, 102.
It is possible to provide in the same embodiment for elastic elements 404 to be made both from portions 404A, 404B of the first panel 101 and from portions 404A, 404B of the second panel 102.
It is also possible to realise a single elastic element 404 which is made by connecting corresponding portions 404A, 404B of the first panel 101 and of the second panel 102 that are connected to each other.
In Figure 4A there is provided a variant providing portions 404A, which are all shaped and cut in the same way. Differently, in Figure 4B there is provided the alternation of portions 404A with portions that are rotated 404B at right angles with respect to the portions 404A.
Nothing prevents from providing further variants with different arrangements, or with different conformations of the shaped and folded portions, all such variants being included within the scope of the appended claims.
Figure 5 depicts a further embodiment providing a multilayer panel 500 in which the first panel 501 comprises a plurality of openings 503 that put the interspace 103 in fluid communication with the outside.
In the embodiment shown the same second panel 102 is used with respect to the previous embodiments.
However, the same solution is only provided for a second panel (not shown), or even for both.
In this way, the first panel 501 and/or the second panel work to increase their own sound-absorbing properties of the panels by exploiting the resonance principles.
Such openings 503 may be distributed according to a well-defined pattern or not, in a periodic manner with greater density at certain portions of the surface of the first panel 501 or the second panel, all such variations being within the scope defined in the appended claims.
Each opening 503, projected onto the plane of the first panel 501 or the second panel, identifies a concave or convex shape. Preferably the shape of these projections is circular. Alternatively, the shape of these projections is slit-shaped.
The presence of the openings 503 allows sound insulation at certain frequencies that can be controlled by designing the shape and the spacing of the openings 503 themselves.
Figure 6 further provides an embodiment in which a multilayer panel 600 according to the invention comprises a mesh layer 601 that is associated at an internal surface 101A of the first panel 101 facing the interspace 103 or on an external surface 10 IB of the first panel 101 opposite the interspace 103.
Similarly, the mesh layer 601 may be associated with an internal surface 102A or an external surface 102B of the second panel 102.
Preferably, the mesh layer 601 is associated with the first panel 101 or the second panel 102 by welding or gluing connection.
Nothing prevents from providing different types of more or less permanent connections.
The mesh layer 601 provides an additional stiffening of the panel 101, 102, with a reduced mass addition compared to a panel having a 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 sound insulation while limiting the weight of the panel 101, 102.
Additionally, the use of the mesh layer 601 provides a non-negligible contribution as regards insulation or high frequency insulation.
In Figures 7A and 7B, a further alternative embodiment is shown in which a multilayer panel 700 is provided which comprises stiffening elements 701 on the internal surface 102 A of the second panel 102, at the connections with the elastic elements 104. Nothing prevents such stiffening elements 701 from being provided on the internal surface 101A of the first panel 101, or on both internal surfaces 101A, 102A, always at the connections with the elastic elements 104. The adoption of the stiffening elements 701, which are nothing more than localised mass elements, clearly guarantees a greater stiffening of the panels 101, 102 at the connection elements 103, a characteristic to be evaluated according to the specific applications of the multilayer panel 700. Figure 8 shows an alternative embodiment of a multilayer panel 800.
The multilayer panel 800 further comprises, in addition to the first panel 101 and the second panel 102, also a layer of thermal insulation material 801 that is associated with the external surface 10 IB of the first panel 101 opposite the interspace 103. Obviously, nothing prevents the layer of thermal insulation material 801 from being associated with the external surface 102B of the second panel 102.
Further, there is nothing to prevent the application of a second layer of thermal insulation 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 rock or mineral wool, or another material with high thermal insulation and fire resistance performance.
The multilayer panel 800 further comprises a third fireproof panel 802 that is associated with the external surface 10 IB of the first panel 101 opposite the interspace 103. Obviously, nothing prevents the third fireproof panel 802 from being associated with the external surface 102B of the second panel 102. Additionally, there is nothing to prevent the application of a fourth fireproof panel (not shown) in order to have an additional layer associated with both the first panel 101 and the second panel 102.
Preferably the third fireproof panel is made of metallic material, or of a material of at least twice the density of the material of the thermal insulation layer 801, and with high fire resistance.
Thanks to this third fireproof panel 802, the flame-retardant properties of multilayer panel 800 are clearly increased.
The use of the layer of thermal insulation material 801 and/or of the third fireproof panel 802 makes it possible to increase the insulation capacity over the entire frequency spectrum by means of a second mass-spring-mass mechanism.
The multilayer panel 800 further comprises resonator elements 803 that are associated with at least one of the first panel 101 and the second panel 102.
In the embodiment shown, the resonator elements 803 are indirectly associated with the external surface 10 IB of the first panel 101 opposite the interspace 103 by interposition of the third fireproof panel
802 to which they are directly connected. Obviously, nothing prevents the resonator elements 803 from being associated with the external surface 102B of the second panel 102, or on an internal surface 101A, 102A of the first panel 101 or of the second panel 102.
Additionally, there is nothing to prevent the application of resonator elements 803 to both the first panel 101 and the second panel 102.
Still further, as mentioned, nothing prevents the resonator elements
803 from being directly associated with the first panel 101 and/or the second panel 102. This may also occur 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 802.
The resonator elements 803 act in a targeted manner on the sound insulation of specific frequencies by means of localised mass resonances of the resonator elements 803 that interact with the layer, preferably metallic, on which they are applied.
The resonator elements 803 are nothing more than massive localised components, which in the embodiment shown consist of bolts, but which may consist of different elements suitable for performing the same function.
Nothing prevents from providing a multilayer panel in which the characteristics of the multilayer panel 800 are used individually.
In fact, the additional layers are not interdependent on each other to perform their specific additional function.
Similarly, nothing prevents these layers from also being associated with different embodiments described above where there are no technical incompatibilities.
Industrial applicability Advantageously, the present invention makes it possible to obtain very good sound attenuation, with also reduced dimensions, particularly in terms of thickness. This also means a low weight, a requirement that is particularly stringent in many cases at the design stage. This is supplemented by the flame-retardant characteristics of the materials used for the panels and preferably also for the elastic elements that are interposed between them.
Obviously there are also considerable 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, the technical applications in which it is necessary to provide sound insulation among rooms and in which additional characteristics of lightness and high resistance to fire are required are taken into consideration. Among these, naval and aeronautical applications are very relevant, although not unique, which also have specific needs in terms of safety.
In view of the description given herein, the person skilled in the art will be able to devise further modifications and variations, in order to satisfy contingent and specific needs.
It is also clear that, where there are no obvious technical incompatibilities to those 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 thermal insulation material on an external layer of the same panel or of the opposite panel. As mentioned, it is also possible to provide several thermal insulation layers.
It is further possible to provide, for example, resonator elements that are placed at one of the two panels opposite to that on which a third fireproof panel is associated, differently from the exemplary embodiment illustrated.
The embodiments described herein are therefore intended to be illustrative and non-limiting examples of the invention.

Claims

1. Sound-insulation fireproof multilayer panel (100, 300A, 300B, 300C, 400A, 400B, 500, 600, 700, 800) comprising a first panel (101, 501) and a second panel (102) facing each other, at least one of said first panel (101, 501) and said second panel (102) being made of fireproof material, an interspace 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 elastic elements (104, 304A, 304B, 304C) that are spaced apart from each other, said plurality of elastic elements (104, 304A, 304B, 304C) providing each a first end (104A) connected to an internal surface (101A) of said first panel (101, 501) and a second end (104B) connected to an internal surface (102A) of said second panel (102), wherein said first panel (101, 501), said second panel (102) and said plurality of elastic elements (104, 304A, 304B, 304C) are made of fireproof material.
2. Sound-insulation fireproof multilayer panel (100, 300A, 300B, 300C, 400A, 400B, 500, 600, 700, 800) according to claim 1, wherein said plurality of elastic elements (104, 304A, 304B, 304C) are spaced apart from each other according to a predetermined periodicity.
3. Sound-insulation fireproof multilayer panel (300A, 300B) according to claim 1 or 2, wherein said elastic elements (304A, 304B) comprise Z- shaped and/or S-shaped elements.
4. Sound-insulation fireproof multilayer panel (300C) according to any one of claims 1 to 3, wherein said elastic elements (304C) comprise straight elements.
5. Sound-insulation fireproof multilayer panel (400A, 400B) according to any one of claims 1 to 4, wherein said elastic elements (404) consist of portions (404A, 404B) of said first panel (101) which are shaped and folded towards said second panel (102) and/or of portions (404A, 404B) of said second panel (102) which are shaped and folded towards said first panel (101).
6. Sound-insulation fireproof multilayer panel (100, 300A, 300B, 300C, 500, 600, 700, 800) according to any one of claims 1 to 4, 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.
7. Sound-insulation fireproof multilayer panel (500) according to any one of claims 1 to 6, wherein at least one of said first panel (501) and said second panel comprises a plurality of openings (503) that put said interspace (103) in fluid communication with the outside.
8. Sound-insulation fireproof multilayer panel (500) according to claim 7, wherein said openings (503) are made with a concave section, a convex section, rectilinear, or a combination thereof.
9. Sound-insulation fireproof multilayer panel (600) according to any one of claims 1 to 8, further comprising a structural stiffening mesh layer (601) that is associated with at least one of said first panel (101) and said second panel (102).
10. Sound-insulation fireproof multilayer panel (700) according to any one of claims 1 to 9, further comprising stiffening elements (701) at one or more connections of said plurality of elastic elements (104).
11. Sound-insulation fireproof multilayer panel (800) according to any one of claims 1 to 10, further comprising a layer of thermal insulation material (801) that is associated with at least one of said first panel (101) and said second panel (102).
12. Sound-insulation fireproof multilayer panel (800) according to any one of claims 1 to 11, further comprising a third fireproof panel (802) that is associated with at least one of said first panel (101) and said second panel (102).
13. Sound-insulation fireproof multilayer panel (800) according to any one of claims 1 to 12, further comprising resonator elements (803) that are directly or indirectly associated with at least one of said first panel (101) and said second panel (102).
14. Sound-insulation fireproof multilayer panel (100, 300A, 300B, 300C, 400A, 400B, 500, 600, 700, 800) according to any one of claims 1 to 13, wherein said first panel (101, 501) and said second panel (102) are made of metallic material.
PCT/EP2021/069567 2020-07-14 2021-07-14 Sound-insultation fireproof multilayer panel WO2022013274A1 (en)

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IT102020000017035A IT202000017035A1 (en) 2020-07-14 2020-07-14 FIREPROOF MULTILAYER SOUND INSULATION PANEL

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4350686A1 (en) * 2022-10-05 2024-04-10 Pantecnica S.p.A. A connection module for a noise shielding device

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1195066B (en) * 1962-07-06 1965-06-16 Hans Helmut Pfaffenholz Dipl I Elastic element
US3878032A (en) * 1969-09-10 1975-04-15 Larsson Lars Inge Bertil Sound-reducing, composite converting panel
US20050194210A1 (en) 2004-03-08 2005-09-08 The Boeing Company Apparatus and method for aircraft cabin noise attenuation via non-obstructive particle damping
CN203714147U (en) 2013-12-20 2014-07-16 华南建材(深圳)有限公司 Fireproof and sound-insulation metal composite wall plate
CN106782482A (en) 2016-11-21 2017-05-31 武汉理工大学 Compound Felt
CN206312564U (en) 2016-12-23 2017-07-07 重庆鑫科高隔热材料有限公司 A kind of sound insulation and noise reduction plate and casing
CN207244993U (en) 2017-07-14 2018-04-17 江苏小熊贝贝装饰材料有限公司 A kind of sound-and-fire proof partition plate

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1195066B (en) * 1962-07-06 1965-06-16 Hans Helmut Pfaffenholz Dipl I Elastic element
US3878032A (en) * 1969-09-10 1975-04-15 Larsson Lars Inge Bertil Sound-reducing, composite converting panel
US20050194210A1 (en) 2004-03-08 2005-09-08 The Boeing Company Apparatus and method for aircraft cabin noise attenuation via non-obstructive particle damping
CN203714147U (en) 2013-12-20 2014-07-16 华南建材(深圳)有限公司 Fireproof and sound-insulation metal composite wall plate
CN106782482A (en) 2016-11-21 2017-05-31 武汉理工大学 Compound Felt
CN206312564U (en) 2016-12-23 2017-07-07 重庆鑫科高隔热材料有限公司 A kind of sound insulation and noise reduction plate and casing
CN207244993U (en) 2017-07-14 2018-04-17 江苏小熊贝贝装饰材料有限公司 A kind of sound-and-fire proof partition plate

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4350686A1 (en) * 2022-10-05 2024-04-10 Pantecnica S.p.A. A connection module for a noise shielding device

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