Glazing comprising an acoustic insulation device and acoustic insulation device for this glazing

Abstract

Glazing comprising an acoustic insulation device and acoustic insulation device for this glazing. The invention relates to a glazing (100, 200) comprising at least two glazed walls forming a cavity between them, the glazing comprising an acoustic insulation device (110, 210) shaped according to a rectilinear profile and arranged within the cavity to delimit a chamber (114, 215) therein, the profile comprising an elastic membrane (111, 211) forming at least a part of a face of said profile, said face being the part of the profile closest to the center of the cavity, and the assembly formed by said chamber and said membrane being configured to resonate at at least one frequency equal or substantially equal to a given frequency. Figure for the abstract: Fig. 1

Description

Title of the invention: Glazing comprising an acoustic insulation device and acoustic insulation device for this glazing Prior art

[0001] The present invention belongs to the general field of glazing manufacturing. It relates more particularly to a device configured to improve the acoustic insulation performance of a glazing. It also relates to a glazing comprising at least one such device. The invention finds a particularly advantageous, although in no way limiting, application in the case of building glazing.

[0002] Double glazing consisting of two panes separated by a cavity filled with gas, typically air, is conventionally used in windows and building facades for its thermal and acoustic insulation performance.

[0003] However, the acoustic insulation achieved by such double glazing may decrease in the vicinity of certain frequencies, such as for example in the vicinity of the resonance frequency of these double glazings, called the “mass / spring / mass” frequency. This known phenomenon of degradation of acoustic insulation performance, called the mass / spring / mass effect, is due to significant variations in pressure in the air cavity at the mass / spring / mass frequency.

[0004] Therefore, with the aim of improving the acoustic insulation performance of glazing, particularly in the vicinity of the mass / spring / mass frequency, various solutions have been developed. For example, document US 2010 / 0300800 describes acoustic glazing, in particular aircraft cockpit glazing, comprising a first glass plate separated from a second intermediate glass plate by a layer of acoustic PVB (polyvinyl butyral), the second glass plate being separated from a third glass plate by a layer of standard PVB or polyurethane.

[0005] While this solution makes it possible to improve acoustic insulation in certain frequency ranges, it nevertheless remains deficient for a large part of the frequency spectrum, particularly at low frequencies which can generally concern the vicinity of the mass / spring / mass frequency.

[0006] To overcome these defects, an existing passive solution is to increase the thickness of the glass plates or the thickness of the glazing cavity. However, this leads to bulky, very heavy structures with an unfavorable on-board carbon footprint.

[0007] Another more recent solution, described in document WO 2022234237, has made it possible to provide a relatively effective response to the aforementioned problems. It essentially consists of the use of a plate delimiting a chamber within the cavity located between the glazed walls of a glazing unit. This plate has a plurality of perforations arranged periodically. The presence of these perforations allows the assembly formed by the plate and the chamber to resonate at (and therefore improve the acoustic insulation at) a frequency close to the mass / spring / mass frequency of the glazing unit.

[0008] That being said, the solution proposed by document WO 2022234237 only proves to be truly effective in a very particular embodiment, namely when a porous absorbent material is present inside the chamber delimited by the plate. The fact of having to include this porous absorbent material can complicate the realization of this solution. In addition, the porous absorbent material can degrade over time, and can therefore impact the effectiveness of the acoustic insulation in the long term. Statement of the invention

[0009] The present invention aims to remedy all or part of the drawbacks of the prior art, in particular those set out above, by proposing a solution which makes it possible to obtain very effective acoustic insulation of a glazing, this solution also being of a lighter, more compact and simpler design than that of the solutions of the state of the art.

[0010] To this end, and according to a first aspect, the invention relates to a glazing comprising at least two glazed walls forming a cavity between them, the glazing comprising an acoustic insulation device shaped according to a rectilinear profile and arranged within the cavity to delimit a chamber therein, the profile comprising an elastic membrane forming at least a part of a face of said profile, said face being the part of the profile closest to the center of the cavity, and the assembly formed by said chamber and said membrane being configured to resonate at at least one frequency equal or substantially equal to a given frequency.

[0011] The glazing according to the invention is therefore advantageous in that the rectilinear profile that it incorporates performs an acoustic insulation function due to the presence of said membrane. More particularly, it is the presence of such an elastic membrane which makes it possible, in conjunction with the presence of the chamber located under said elastic membrane, to produce an acoustic damper.

[0012] Such glazing according to the invention makes it possible to obtain excellent acoustic insulation results, as is apparent from comparative results described in more detail below.

[0013] The solution proposed by the invention is therefore not only very effective in terms of acoustic insulation, but also less complex to implement from a from a material point of view, and represents a fortiori a less expensive solution than those of the state of the art.

[0014] In particular embodiments, the glazing may further comprise one or more of the following characteristics, taken individually or in all technically possible combinations.

[0015] In particular embodiments, the elastic membrane is made of a material chosen from the following list: silicone, polyurethane, acrylic, polydimethylsiloxane, natural or synthetic elastomer (for example, polyisoprene), hydrogel.

[0016] In particular embodiments, the elastic membrane comprises a plurality of perforations arranged periodically.

[0017] In particular embodiments, a porous absorbent material is present within the chamber, preferably selected from the group consisting of mineral wools, textile fibers, polymeric foams and combinations thereof.

[0018] In particular embodiments, said at least one resonance frequency of the assembly formed by said chamber and said membrane is between 200 Hz and 2000 Hz.

[0019] In particular embodiments, said at least one resonance frequency of the assembly formed by said chamber and said membrane comprises a frequency equal or substantially equal to the mass / spring / mass frequency of the glazing.

[0020] In particular embodiments, said mass / spring / mass frequency of the glazing is between 200 Hz and 400 Hz, more particularly between 200 Hz and 315 Hz, even more particularly between 200 Hz and 250 Hz.

[0021] In particular embodiments, the acoustic insulation device further comprises desiccant means configured to absorb the humidity present in said chamber.

[0022] In particular embodiments, the acoustic insulation device is positioned in a peripheral zone of the glazing cavity.

[0023] In particular embodiments, the glazing comprises a plurality of acoustic insulation devices distributed in distinct peripheral zones of the cavity, said peripheral zones being located at distinct edges of the glazing.

[0024] In particular embodiments, at least two resonance frequencies respectively associated with two acoustic insulation devices are distinct from each other.

[0025] In particular embodiments, said glazing is building glazing, such as facade, window or building door glazing or interior glazing.

[0026] According to a second aspect, the invention also relates to an isolation device acoustic suitable for the manufacture of glazing according to the invention. Brief description of the drawings

[0027] Other characteristics and advantages of the present invention will emerge from the description given below, with reference to the appended drawings which illustrate an exemplary embodiment thereof without any limiting character. In the figures: [Fig.l] [Fig.l] represents on its left part an example of glazing according to the invention and, on its right part, an enlarged schematic and perspective view of an example of acoustic insulation device equipping said glazing; [Fig.2] [Fig.2] represents on its left part another example of glazing according to the invention and, on its right part, an enlarged schematic and perspective view of another example of acoustic insulation device equipping said glazing; [Fig.3] [Fig.3] is a graph representing acoustic insulation performances for respectively a glazing according to the invention and a reference glazing according to the state of the art.

[0028] Description of embodiments

[0029] The present invention relates to an acoustic insulation device for a glazing unit. By "acoustic insulation" device, we mean a device configured to improve the acoustic insulation of a glazing unit, or, in other words, to increase the sound attenuation achieved by the glazing unit. In the present disclosure, the improvement in acoustic insulation relates to at least one frequency equal or substantially equal to a given frequency, these aspects being described in more detail later.

[0030] In any event, the invention covers several aspects, namely not only the sound insulation device as such, but also the glazing into which at least one such sound insulation device is integrated.

[0031] [Fig. 1] schematically represents a particular embodiment of a glazing unit 100 according to the invention. It corresponds more particularly to a front view of said glazing unit 100.

[0032] For the remainder of the description, it is considered in a non-limiting manner that the glazing 100 is a double glazing. In other words, it is a glazing comprising two glazed walls forming a cavity between them. In a manner known per se, said cavity is defined as being the volume between the two glazed walls of said glazing 100, and forms a gas layer, the gas being able to be air, argon, xenon, krypton, etc.

[0033] By "glass wall" is meant a plate formed from a transparent material. For example, the transparent material may be mineral glass, such as soda-lime, aluminosilicate, or borosilicate glass. Alternatively, the transparent material may be organic glass, such as stretched polymethyl methacrylate (stretched PMMA), unstretched polymethyl methacrylate, polycarbonate (PC), polyethylene terephthalate (PET) or polyurethane (PU).

[0034] The fact of considering double glazing does not, however, constitute a limitation of the invention, and nothing excludes considering glazing of another type as long as the latter is multi-glazed so as to comprise at least two glazed walls forming a cavity between them, such as for example triple glazing.

[0035] The invention is not further limited by the use envisaged for said glazing 100. Preferably, the glazing 100 is a building glazing, such as a facade, window or building door glazing or an interior glazing.

[0036] As illustrated by [Fig.l], the glazing 100 comprises, in the present embodiment, four acoustic insulation devices 110.

[0037] More particularly, the four acoustic insulation devices 110 are distributed in distinct peripheral zones of the cavity, said peripheral zones being located at distinct edges of the glazing 100 (it being understood that the glazing 100 has, when observed in a direction orthogonal to the plane in which it extends, a generally rectangular shape and therefore comprises four distinct edges).

[0038] By “peripheral zone of the cavity” is meant a zone of the cavity adjacent to an edge of the glazing 100, and therefore located between the two glazed walls so as to take the form of a groove between them.

[0039] The width of a peripheral zone of the cavity is limited by the gap between the glazed walls. Its length is limited by the length or the width of the glazing 100 depending on whether said peripheral zone is located at an edge extending along said length or said width of the glazing 100.

[0040] It is important to note that considering four sound insulation devices constitutes only a variant implementation of the invention. Generally speaking, no limitation is attached to this number as long as it is greater than or equal to 1.

[0041] Furthermore, if it is considered in the present embodiment that the four acoustic insulation devices 110 are distributed in distinct peripheral zones of the cavity, nothing excludes the possibility of considering other embodiments in which these technical considerations apply only to a part, or even to none, of said devices 110. It is understood in fact that having a positioning in such peripheral zones makes it possible in particular to improve the aesthetic appearance of the glazing, insofar as said peripheral zones (and therefore a fortiori said devices 110) can be masked by traditional frame elements. However, these are not essential aspects of the invention, in particular with regard to the objective of improving the acoustic insulation of the glazing 100.

[0042] For the remainder of the description, it is considered in a non-limiting manner that the four devices 110 are configured in an identical manner to achieve the insulation. acoustics of the glazing 100. Consequently, in the following and unless otherwise stated, the expression “the device 110” refers indifferently to any one of the four devices 110 equipping the glazing 100.

[0043] It is important to note, however, that this hypothesis is not limiting of the invention, other exemplary embodiments being described later in which the configurations of all or part of the devices 110 may differ from each other to achieve the acoustic insulation of the glazing 100.

[0044] We also note, on the right part of [Fig. 1], the representation of an enlarged schematic and perspective view of one of said devices 110, more particularly that located in the lower part of the glazing 100. Of course, with regard to the hypothesis made here (same configuration of the devices 110 to achieve the acoustic insulation of the glazing 100), this representation is valid for the other devices 110.

[0045] As illustrated by [Fig. 1] without any limitation, the device 110 is shaped according to a rectilinear profile. By "rectilinear profile", we mean that the profile is straight in the direction of its length.

[0046] More particularly, the device 110 comprises an upper face 111, a lower face 112 opposite the upper face 111, as well as two lateral faces 113 connecting said upper 111 and lower 112 faces together.

[0047] In the present disclosure, the terms "upper" and "lower" are used to designate the faces of the profile 110 which are respectively closest and furthest from the center of the cavity.

[0048] The profile 110 has, in the mode described here and in a cross section, a rectangular shape. In addition, the profile 110 does not have, at its ends, transverse faces in contact with each of the other faces 111, 112, 113 (in other words, the profile 110 is not closed at its ends). Of course, this is only one variant embodiment, others being conceivable, both in terms of the shape of the cross section (square, trapezoid, etc.) and the presence of a transverse face at all or part of the ends of the profile 110.

[0049] In addition to being rectilinear, the profile 110 is also tubular. By “tubular profile” is meant a hollow profile, that is to say comprising a chamber 114. Said chamber 114 therefore corresponds to the free space delimited by the upper 111, lower 112 and lateral 113 faces. The height of the chamber 114 inside the profile 110 therefore corresponds to the distance between the upper face 111 and the lower face 112.

[0050] The upper face 111 of the profile 110 is an elastic membrane (represented by means of hatching in [Fig.l]). The presence of such an elastic membrane 111 allows, in conjunction with the presence of the chamber 114 located under said elastic membrane 111, to produce an acoustic damper.

[0051] No limitation is attached to the material from which the elastic membrane 111 is made as long as the latter is capable of deforming. For example, the elastic membrane 111 can be made from a material chosen from the following list: silicone, polyurethane, acrylic, polydimethylsiloxane, natural or synthetic elastomer (for example, polyisoprene), hydrogel.

[0052] The other faces of the profile 110, namely the lower 112 and lateral 113 faces, therefore form, in this embodiment, a support for fixing the elastic membrane 111. For this purpose, said lower 112 and lateral 113 faces are made of a more rigid material than the membrane 111, so as to perform said support function.

[0053] For example, said lower 112 and lateral 113 faces may be made of metallic material, preferably aluminum and / or stainless steel, and / or polymer material, the polymer material being optionally reinforced with glass fibers.

[0054] The attachment of the elastic membrane 111 to the support produced by the other faces 112, 113 is carried out according to any method known to those skilled in the art, the choice of a specific method constituting only a variant of implementation of the invention.

[0055] It should be noted that, in the present embodiment described with reference to [Fig. 1], the elastic membrane forms the entire upper face 111 of the profile 110. These arrangements are however not limiting of the invention, and nothing excludes the possibility of considering other embodiments in which only a part of the upper face 111 is formed by the elastic membrane.

[0056] For example, the lateral faces 113 may have a given thickness and thus form, when seen from above, a frame delimiting an internal zone in which said elastic membrane is arranged. The upper face 111 of the profile 110 is then formed by the association of said frame and said elastic membrane.

[0057] According to yet another example, the upper face 111 may be formed by one or more flat surfaces completed by said elastic membrane. Said flat surfaces may in particular be made of a material that is more rigid than that of the elastic membrane.

[0058] Generally speaking, no limitation is attached to the proportion of surface area occupied by the elastic membrane with respect to the upper face 111 of the profile 110.

[0059] As mentioned above, the elastic membrane 111 makes it possible, in cooperation with the chamber 114, to produce an acoustic damper. More particularly, the assembly formed by said chamber 114 and said membrane 111 is configured to resonate at at least one frequency equal or substantially equal to a given frequency.

[0060] In a known manner, different configuration parameters of the assembly formed by said chamber 114 and said membrane 111 can be taken into account to adjust frequencies associated with the resonance modes of this assembly. These parameters include for example: the height of the chamber 114 (i.e. the gap between the upper face 111 and the lower face 112), the tension of the elastic membrane 111, the surface area mass of the elastic membrane 111, the thickness of the elastic membrane 111, etc.

[0061] In particular, any method known to those skilled in the art for configuring, on the basis of such parameters, the assembly formed by said chamber 114 and said membrane 111 so that it has at least one resonance frequency equal or substantially equal to a given frequency can be envisaged.

[0062] For example, such a configuration method may consist of fixing one or more of said parameters (for example due to dimensional constraints linked to the arrangement of the acoustic insulation device 110 within the cavity of the glazing 100), and carrying out experiments aimed at varying the other remaining parameter(s) so as to obtain at least one resonance frequency equal or substantially equal to a given frequency. Such experiments are for example implemented using an impedance tube (Kundt tube) of given diameter, for example a diameter of 100 mm, and according to the ISO 10534-2 standard.

[0063] According to another example, to achieve acoustic damping at a given frequency, the appropriate configuration of the assembly formed by said chamber 114 and said membrane 111 can be achieved by numerical simulation, typically using finite element modeling of said assembly.

[0064] In any event, and generally speaking, no limitation is attached to the value to which a resonance frequency of the assembly formed by said chamber 114 and said membrane 111 can be adjusted, within the limit of the frequencies achievable with regard to the dimensional constraints imposed on the acoustic insulation device due to its integration in the cavity of the glazing 100 and / or the material chosen for the membrane 114.

[0065] By way of non-limiting example, the following ranges of values ​​may be envisaged for different parameters and according to any technically operative combination with the objective of adjusting at least one resonance frequency of the assembly formed by said chamber 114 and said membrane 111: - the thickness of the membrane 111 can be between 0.01 mm and 3 mm; - the height of the chamber 114 can be between 4 mm and 200 mm; - the tension of the membrane 111 can be between 10 N.m1 and 1000 N.m1; - the surface mass of the membrane 111 depends on the material of the latter. For example, if the membrane 111 is made of acrylic (respectively silicone, polyurethane, polydimethylsiloxane), the surface mass can be between 100 g.m2 and 500 g.m2 (respectively between 100 g.m2 and 500 g.m2, between 50 g.m2 and 300 g.m2, between 50 g.m2 and 200 g.m2).

[0066] Thus, the assembly formed by said chamber 114 and said membrane 111 can for example be configured to have one or more resonance frequencies between 200 Hz and 2000 Hz.

[0067] In a more specific implementation, said resonance frequency(ies) may comprise a frequency equal or substantially equal to the mass / spring / mass frequency of the glazing 100.

[0068] Said mass / spring / mass frequency of the glazing 100 depends, in a manner known per se, on the configuration of said glazing 100, and generally corresponds to a low frequency (relative to the usual frequency spectrum to which a glazing may be subjected). It is for example between 200 Hz and 400 Hz, more particularly between 200 Hz and 315 Hz, even more particularly between 200 Hz and 250 Hz.

[0069] In terms of dimensional characteristics, the length of the profile 110 may be equal to the length of the peripheral zone in which it is positioned.

[0070] Alternatively, the length of the profile 110 may be less than that of said peripheral zone.

[0071] In the embodiment described here with reference to [Fig.l], the respective lengths of the four acoustic insulation devices 110 are configured so that each device is in contact, at its ends, with two other devices. In this way, the four devices 110 form a peripheral frame within the cavity of the glazing 100. Such a frame can be made in one piece or be supplied in the form of a kit to be assembled element by element.

[0072] Following similar considerations, the width of the profile 110 can be adapted according to the dimensional characteristics of the peripheral zone receiving said profile 110.

[0073] For example, the width of the profile 110 may be equal to the distance separating the glazed walls of the glazing 100. In this way, the profile 110 forms a so-called “spacing” device, i.e. a device capable of maintaining a constant gap between the glazed walls, this gap corresponding to the width of said profile 110.

[0074] However, nothing precludes considering that the width of the profile 110 is less than the distance separating the glazed walls of the glazing 100. In such an embodiment, sealing joints can advantageously be arranged between the profile 110 and the glazed walls.

[0075] It should be noted that the invention has been described so far considering that the four sound insulation devices 110 all resonate at the same frequency. These arrangements are however not limiting of the invention, and nothing excludes to consider other modes in which at least two resonant frequencies respectively associated with two acoustic insulation devices are distinct from each other.

[0076] By way of non-limiting example, at least one frequency associated with a device 110 may correspond to a third of an octave lower than the mass / spring / mass frequency of the glazing 100, or to a frequency close to this. This makes it possible to increase the loss of sound transmission at frequencies close to this frequency.

[0077] Alternatively or in addition, at least one frequency associated with another device 110 may correspond to a third of an octave higher than the mass / spring / mass frequency of the glazing 100, or to a frequency close to this.

[0078] The invention has also been described up to now by considering that each sound insulation device is shaped according to a tubular rectilinear profile. However, the fact that the profile is tubular is in no way a limitation of the invention. For example, nothing excludes the possibility of considering a profile comprising lateral faces as well as transverse faces, but nevertheless without a lower face and in which the upper face is also formed by the elastic membrane. In other words, the profile may have, in cross section, a U shape. Therefore, the chamber intended to resonate with the elastic membrane can be produced by inserting the profile in a peripheral zone of the cavity, so that the lateral faces of the profile are in contact with a frame surface (mullion / transom) of the glazing.

[0079] [Fig. 2] schematically represents another particular embodiment of a glazing 200 according to the invention. It corresponds more particularly to a front view of said glazing 200.

[0080] In the embodiment of [Fig. 2], and similarly to what has been described with reference to the embodiment of [Fig. 1], the glazing 200 comprises four acoustic insulation devices 210 distributed in distinct peripheral zones of the cavity, said peripheral zones being located at distinct edges of the glazing 200. Each of the four devices 210 is shaped according to a rectilinear tubular profile, and comprises an upper face 211 formed by an elastic membrane, a lower face 212 opposite the upper face 211, two lateral faces 213 connecting together said upper 211 and lower 212 faces, as well as two transverse faces 214 forming ends. In addition, each of the four devices 210 delimits a chamber 215.

[0081] Each of the four devices 210 has a length less than that of the geographical area in which it is inserted. In other words, the four devices 210 are separate from each other and therefore do not form a frame. Furthermore, in this embodiment of [Fig. 2], the four devices 210 all have the same length. Of course, this is only an alternative embodiment, and nothing precludes the devices 210 being wholly or partly disjointed from each other and / or have lengths distinct from each other.

[0082] The glazing 200 of the embodiment of [Fig.2] is also distinguished from that of the embodiment of [Fig.1] in that, for each of the devices 210, the elastic membrane 211 comprises a plurality of perforations 216 arranged periodically.

[0083] The presence of such perforations 216 constitutes an additional parameter (with respect to the parameters mentioned above with reference to [Fig.l]) for adjusting a resonance frequency of the assembly formed by the chamber 215 and the elastic membrane 211, so that this resonance frequency is equal or substantially equal to a given frequency.

[0084] The configuration of the perforations 216 itself depends on a plurality of parameters, such as for example: - the number of perforations 216, for example equal to three or four, - the shape of the perforations 216, for example a circular shape, - the maximum diameter or dimension of the perforations, for example between 0.2 mm and 8 mm, preferably between 0.5 mm and 8 mm, - the distance between the centers of the perforations, for example between 5 mm and 200 mm, preferably between 10 mm and 110 mm.

[0085] The glazing 200 of the embodiment of [Fig.2] is also distinguished from that of the embodiment of [Fig.1] in that, for each of the devices 210, a porous absorbent material is present inside the chamber 215.

[0086] The use of such a porous absorbent material makes it possible to reinforce the acoustic absorption of the constitutes an additional parameter (with respect to the parameters mentioned above with reference to [Fig.l]) for adjusting a resonance frequency of the assembly formed by the chamber 215 and the elastic membrane 211, so that this resonance frequency is equal or substantially equal to a given frequency.

[0087] Preferably, said porous absorbent material is selected from the group consisting of mineral wools, textile fibers, polymer foams and combinations thereof.

[0088] Generally speaking, all the technical characteristics described in document WO 2022234237 with regard to the configuration of such perforations 216 as well as the possible choices concerning the porous absorbent material are conceivable within the framework of the present invention.

[0089] It should further be noted that if it is assumed here that the devices 210 are configured identically in terms of perforations and porous absorbent material, the invention is not limited by such arrangements.

[0090] Generally speaking, the technical characteristics described with reference to the modes of figures 1 and 2 can be envisaged in any technically operative combination.

[0091] Furthermore, each sound insulation device may comprise desiccant means configured to absorb the moisture present in the chamber that it delimits. By "desiccant means", we conventionally refer to means which have the property of drying the atmosphere in which they are placed, or, in other words, of absorbing all or part of the moisture contained in this atmosphere. Such desiccant means may for example be arranged within said chamber, and may for example consist of granules made of molecular sieve, silica gel, calcium chloride (CaCL), sodium sulfate (NazSO ), activated carbon, zeolites of chemical formulation M2 / nO.Al2O3.xSiO2.yH2O; M may be replaced by Ca, Mg, K, Na. Generally, any material known to the person skilled in the art for producing desiccant means may be used.

[0092] The remainder of the description aims to describe a specific example of the production of a glazing unit according to the invention, as well as to compare the acoustic insulation performance thereof with that of a reference glazing unit according to the state of the art.

[0093] A first glazing according to the invention was manufactured. This glazing comprises two rectangular glazed walls of monolithic glass (non-tempered, non-laminated), each having the following dimensions: 1480 mm in length, 1230 mm in width and 4 mm in thickness.

[0094] The first glazing unit comprises four sound insulation devices positioned in respective peripheral zones of the glass walls, so as to form between them a cavity 16 mm thick. The cavity of the glazing unit comprises air. Each sound insulation device is shaped according to a rectilinear tubular profile of rectangular section and the side faces of which are fixed to the glass walls. The tubular profiles are made of composite material including fiberglass and have walls 1.2 mm thick.

[0095] The upper face of each profile equipping the first glazing is an elastic membrane made of acrylic, with a thickness equal to 0.11 mm, a tension equal to 30.05 N.m1, and a surface density substantially equal to 1.17 g.m2. The dimensions of each elastic membrane are respectively 150 mm and 13 mm in length and width. The dimensions of each tubular profile are respectively 154 mm and 15 mm in length and width. Seen from above, each tubular profile forms a frame delimiting an internal zone in which the elastic membrane associated with it is arranged.

[0096] The height of each tubular profile is such that it delimits a chamber of height 15 mm.

[0097] A second comparative glazing was also manufactured. This second glazing differs from the first glazing in that it does not include any sound insulation device.

[0098] The first and second glazings are both characterized by a mass / spring / mass frequency equal to 212 Hz.

[0099] The spectrum of the sound reduction index (R) of the first and second glazings was measured as a function of frequency, according to the measurement protocol defined by the ISO 10140 standard.

[0100] The results are shown in [Fig.3] and in the table below. In [Fig.3], the solid line (respectively dotted line) curve represents the acoustic attenuation of the first glazing (respectively of the second glazing). In the table, the first glazing (respectively second glazing) is called glazing no. 1 (respectively glazing no. 2).

[0101] Glazed WràQé rO § f____________iw_______________ 30 28.9 j ..............|

[0102] The acoustic indices Rw, RA and RA.tr are determined according to the ISO 717-1 standard. This table shows an increase in the acoustic indices Rw, RA and RA.tr for the first glazing compared to the second glazing.

[0103] It is also clear from [Fig. 3] that the presence of the elastic membranes in the profiles allows an improvement in the acoustic performance of the first glazing, in particular for the frequencies around the mass / spring / mass frequency of the glazing. In addition, this acoustic improvement is not limited to this single value of the mass / spring / mass frequency of the glazing, but is “smoothed” (i.e. is propagated) around it, more particularly in this example in the frequency range between 200 Hz and 315 Hz (said range covers the thirds of an octave around the mass / spring / mass frequency).

[0104] It can also be observed in [Fig. 3] that the first glazing has better acoustic absorption than that of the second glazing for frequencies between 315 Hz and 2000 Hz. This is the consequence of the specific configuration of the assembly formed by the acoustic membrane and the chamber of the profile, this configuration being such that it allows this assembly to have natural resonance modes (i.e. resonance frequencies) capable of acoustic damping for these frequencies between 315 Hz and 2000 Hz.

Claims

Claims

1. Glazing (100, 200) comprising at least two glazed walls forming a cavity between them, the glazing comprising an acoustic insulation device (110, 210) shaped according to a rectilinear profile and arranged within the cavity to delimit a chamber (114, 215) therein, characterized in that the profile comprises an elastic membrane (111, 211) forming at least a part of a face of said profile, said face being the part of the profile closest to the center of the cavity, and the assembly formed by said chamber and said membrane being configured to resonate at at least one frequency equal or substantially equal to a given frequency.

2. Glazing (100, 200) according to claim 1, in which the elastic membrane (111, 211) is made of a material chosen from the following list: silicone, polyurethane, acrylic, polydimethylsiloxane, natural or synthetic elastomer (for example, polyisoprene), hydrogel.

3. Glazing (200) according to any one of claims 1 to 2, in which the elastic membrane (211) comprises a plurality of perforations (216) arranged periodically.

4. Glazing (100, 200) according to any one of claims 1 to 3, wherein a porous absorbent material is present within the chamber, preferably selected from the group consisting of mineral wools, textile fibers, polymeric foams and combinations thereof.

5. Glazing (100, 200) according to any one of claims 1 to 4, wherein said at least one resonance frequency of the assembly formed by said chamber (114, 215) and said membrane (111, 211) is between 200 Hz and 2000 Hz.

6. Glazing (100, 200) according to claim 5, in which said at least one resonance frequency of the assembly formed by said chamber (114, 215) and said membrane (111, 211) comprises a frequency equal or substantially equal to the mass / spring / mass frequency of the glazing.

7. Glazing (100, 200) according to claim 6, wherein said mass / spring / mass frequency of the glazing is between 200 Hz and 400 Hz, more particularly between 200 Hz and 315 Hz, even more particularly between 200 Hz and 250 Hz.

8. Glazing (100, 200) according to any one of claims 1 to 7, wherein the sound insulation device (110, 210) further comprises desiccant means configured to absorb moisture present in said chamber.

9. Glazing (100, 200) according to any one of claims 1 to 8, wherein the acoustic insulation device (110, 210) is positioned in a peripheral zone of the cavity of the glazing.

10. Glazing (100, 200) according to claim 9, wherein the glazing comprises a plurality of acoustic insulation devices (110, 210) distributed in distinct peripheral zones of the cavity, said peripheral zones being located at distinct edges of the glazing.

11. Glazing (100, 200) according to claim 10, in which at least two resonance frequencies respectively associated with two acoustic insulation devices are distinct from each other.

12. Glazing (100, 200) according to any one of claims 1 to 11, wherein said glazing is building glazing, such as building facade, window or door glazing or interior glazing.

13. Acoustic insulation device (110, 210) suitable for the manufacture of glazing (100, 200) according to any one of claims 1 to 12.

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